Ribbed slabs 2 meters wide. Overview of U-shaped floor slabs
STATE STANDARD OF THE UNION OF SSR
REINFORCED CONCRETE COVERING PLATES
FOR ENTERPRISE BUILDINGS
TECHNICAL CONDITIONS
GOST 28042-89
USSR STATE CONSTRUCTION COMMITTEE
1. TECHNICAL REQUIREMENTS
1.1. Plates should be manufactured in accordance with the requirements of this standard and technological documentation approved in the prescribed manner, according to working drawings of series 1.465.1-7 / 84, 1.465.1-13, 1.465.1-14, 1.465.1-15, 1.465. 1-16, 1.465.1-17, PK-01-88, 1.865.1-4 / 89 and 1.865.1-8. (Changed edition). It is allowed to manufacture slabs that differ in types and sizes from those given in this standard, according to technical conditions and corresponding working drawings, approved in the prescribed manner. 1.2. Basic parameters and dimensions 1.2.1. Reinforced concrete ribbed slabs with coordination dimensions 1.5 ´ 6, 1.5 ´ 12, 3 ´ 6, 3 ´ 12 and 3 ´ 18 m are prestressed, and additional ribbed and flat ones are made with non-tensioned reinforcement. (Changed edition). 1.2.2. Prestressed slabs are subdivided into the following types: PG - without openings in the slab shelf, with an upper flat (horizontal or gable) surface; POG - the same, with a vaulted upper surface (shell plates); PV - with openings in the shelf of the slab for the passage of ventilation shafts with deflectors or umbrellas, as well as air ducts of roof fans, with an upper flat (horizontal or gable) surface; POV - the same, shell slabs; PF - with openings in the shelf of the slab for the installation of skylights, with an upper flat (horizontal or gable) surface; POF - the same, shell slabs; PS - with openings in the shelf of the slab for installing light-aeration lights, with an upper flat (horizontal or gable) surface; POS - the same, shell slabs; PL - with openings in the shelf of the slab for the installation of an easily dropable roof, with an upper flat (horizontal or gable) surface; FLOOR - the same, shell slabs. 1.2.3. Plates with non-tensioned reinforcement are manufactured without openings in the shelf and are subdivided into the following types: PR - ribbed; PP - flat. 1.2.4. the shape and main dimensions of the slabs must correspond to those given in the appendix. 1.2.5. Concrete and steel consumption rates for slabs must correspond to those indicated in working drawings or standards for these slabs. 1.2.6. In the cases provided for by the building project, the slabs may have additional holes, cutouts in the shelves, depressions on the outer edges of the longitudinal ribs for the installation of concrete dowels between adjacent slabs, as well as additional embedded products. 1.2.7. Plates are marked with grades in accordance with the requirements of GOST 23009. The plate brand consists of alphanumeric groups separated by hyphens. In the first group, indicate the designation of the standard size of the plate. In the second group, the serial number of the slab in terms of bearing capacity, the class of prestressed reinforcement (for prestressed slabs), and the type of concrete (for slabs made of lightweight concrete) are indicated. The third group, if necessary, includes additional characteristics reflecting the special conditions of use of the slabs: their resistance to the effects of an aggressive environment, seismic and other influences, as well as designations of the design features of the slabs (the presence, size and location of openings, the presence of additional embedded products, etc. ). An example of a conventional designation (brand) of a slab of standard size 3PG6, the second in terms of bearing capacity, with prestressing reinforcing steel of class At-V, made of heavy concrete:3PG6-2At VI
The same, the third in terms of bearing capacity, with prestressing reinforcing steel of class At-V, made of lightweight concrete, with additional embedded products:
3PG6-3At V L-a
The same, slabs of standard size 4PV6, the fourth in terms of bearing capacity, with prestressing reinforcing steel of class At-V, made of lightweight concrete, with an opening with a diameter of 400 mm:
4PV6-4At V L-4
Note. It is allowed to accept the designations of the brands of plates in accordance with the instructions of the working drawings and standards for these plates before their revision. 1.3. Features 1.3.1. The slabs must meet the requirements of GOST 13015.0: in terms of the actual strength of concrete (transfer, release and design age); for frost resistance of concrete, and for slabs operated under the influence of an aggressive gaseous medium also for water resistance of concrete; in terms of the actual average density of lightweight concrete; to steel grades for reinforcement and embedded products, including for mounting loops; by the thickness of the concrete cover to the reinforcement; for corrosion protection. 1.3.2. Plates must meet the design requirements for strength, rigidity and crack resistance and, when tested loaded, withstand the control loads specified in the working drawings or standards for these plates. 1.3.3. Slabs should be made of heavy concrete in accordance with GOST 26633 or lightweight concrete of dense structure in accordance with GOST 25820 classes or grades of concrete for compressive strength specified in the working drawings or in the standards for these slabs. 1.3.4. The transfer of the compression forces to the concrete (release of tension of the reinforcement) in the prestressed slabs should be carried out after the concrete has reached the required transfer strength. The normalized transfer strength of concrete of prestressed slabs, depending on the class or grade of concrete, type and class of prestressed reinforcing steel, must correspond to that specified in the working drawings or standards for these slabs. 1.3.5. The normalized tempering strength of concrete of prestressed slabs is taken to be equal to the normalized transfer strength, and of slabs with non-tensioned reinforcement - 70% of the compressive strength class or grade. When slabs are delivered during the cold season, the normalized tempering strength of concrete slabs can be increased to 85% of the class or grade of concrete in terms of compressive strength in accordance with the instructions of the working drawings or standards for these slabs. 1.3.6. For the reinforcement of slabs, reinforcing steel of the following types and classes should be used: as prestressing reinforcement - thermomechanically hardened rod classes A t-VI, A t - V, A t - VCK, A t - IVC, A t - IVK according to GOST 10884, hot-rolled rod classes A - V, A - IV in accordance with GOST 5781, reinforcing ropes of class K-7 in accordance with GOST 13840, high-strength wire of the periodic profile of class Вр-II in accordance with GOST 7348 and rod classes A-III в, made of reinforcing steel of class A - III in accordance with GOST 5781 by strengthening by drawing with control of the magnitude of stress and ultimate elongation; as non-stressed - bar reinforcing steel of classes A-III and A-I according to GOST 5781; thermomechanically hardened class A t - IVC and A t - IIIC according to GOST 10884 and ordinary reinforcing wire of class Вр-1 according to GOST 6727. 1.3.7. The prestressing reinforcement rods of classes A-III b, A-IV, A-V and A t-IVC can be joined by a contact butt welding in accordance with the requirements of GOST 14098. Welded joints should be placed from the ends of the slab no further than a quarter of its length. 1.3.8. The values \u200b\u200bof the actual deviations of stresses in prestressing reinforcement should not exceed the limiting ones established in the working drawings or standards for plates. 1.3.9. The shape and dimensions of reinforcement and embedded products and their position in the slabs must correspond to those indicated in the working drawings or standards for these slabs. 1.3.10. The values \u200b\u200bof the actual deviations of the geometric parameters of the plates should not exceed the limiting values \u200b\u200bindicated in table. 1. 1.3.11. The difference between the bends of prestressed slabs of the same grade in terms of bearing capacity and prestressed reinforcement should not exceed, mm: 10 - with the length of the slabs up to 6000 mm; 20 "" "" 12000 mm; 30 "" "" 18000 mm.
Table 1
|
Geometric parameter deviation name |
Geometric parameter name |
Prev off |
| Deviation from linear dimension | Plate length: | |
| 2990 and less | ||
| 5970 | ||
| 11960 | ||
| 17940, 17960 | ||
| Slab width | ||
| Plate height: | ||
| up to 450 incl. | ||
| St. 450 | ||
| Shelf thickness | ||
| Rib sizes | ||
| Position of openings, holes and cutouts | ||
| Position of embedded products: | ||
| in the plane of the slab: | ||
| support products | ||
| additional products | ||
| from the plane of the plate | ||
| Deviation from the straightness of the profile of the outer side surfaces of the longitudinal ribs of the slabs along their entire length | Plate length: | |
| 1490, 2990 | ||
| 5970 | ||
| 11960 | ||
| 17940, 17960 |
2. ACCEPTANCE
2.1. Acceptance of plates - in accordance with GOST 13015.1 and this standard. In this case, the slabs are taken: according to the results of periodic tests - in terms of strength, stiffness and crack resistance of slabs, frost resistance of concrete, porosity of a compacted mixture of lightweight concrete, as well as water resistance of concrete slabs intended for operation under the influence of an aggressive gaseous environment; according to the results of acceptance tests - in terms of concrete strength (class or grade of concrete in terms of compressive strength, transfer and tempering strength), average density of lightweight concrete, compliance of reinforcement and embedded products with working drawings, strength of welded joints, accuracy of geometric parameters, thickness of protective concrete layer to reinforcement, width of technological crack opening, category of concrete surface. 2.2. Periodic loading tests of prestressed slabs to control their strength, stiffness and crack resistance are carried out before the start of mass production of slabs and subsequently when structural changes are made to them and when the manufacturing technology changes in accordance with the requirements of GOST 13015.1. In the course of serial production of slabs, loading tests are carried out at least once a year. Tests of plates with a length of 5970 mm or less in the process of their serial production may not be carried out if non-destructive testing is carried out in accordance with GOST 13015.1. 2.3. Tests of concrete in terms of porosity (volume of intergranular voids) of a compacted lightweight concrete mixture should be carried out at least once a month. 2.4. Plates in terms of accuracy of geometric parameters, thickness of the concrete cover to reinforcement, category of concrete surface and width of technological crack opening should be taken based on the results of sampling. 2.5. In the document on the quality of slabs intended for operation in conditions of exposure to aggressive gaseous media, the concrete grade for water resistance must additionally be given (if this indicator is specified in the order for the manufacture of slabs).3. CONTROL METHODS
3.1. The strength of concrete slabs should be determined in accordance with GOST 10180 on a series of samples made from a concrete mixture of the working composition and stored under the conditions established by GOST 18105. When controlling the strength of concrete by non-destructive methods, the actual transfer and tempering compressive strength of concrete should be determined by the ultrasonic method according to GOST 17624 or by mechanical devices according to GOST 22690, as well as other methods provided for in the standards for concrete testing methods. 3.2. Frost resistance of concrete slabs should be determined in accordance with GOST 10060 on a series of samples made from a concrete mixture of the working composition. 3.3. The water resistance of concrete slabs intended for operation under conditions of exposure to an aggressive gaseous environment should be determined in accordance with GOST 12730.0 and GOST 12730.5 on a series of samples made from a concrete mixture of a working composition. 3.4. Porosity indicators of a compacted lightweight concrete mixture should be determined in accordance with GOST 10181.0 and GOST 10181.3. 3.5. The average density of lightweight concrete slabs should be determined according to GOST 12730.0, GOST 12730.1 or by the radioisotope method according to GOST 17623. 3.6. Inspection of welded reinforcement and embedded products should be carried out in accordance with GOST 10922 and GOST 23858. 3.7. The tensile force of the reinforcement, controlled at the end of the tension, should be measured in accordance with GOST 22362. 3.8. The dimensions and deviations from the straightness of the surfaces of the slabs, the width of the opening of technological cracks, the dimensions of the cavities, sagging and rounding of concrete of the slabs should be checked by the methods established by GOST 26433.0 and GOST 26433.1. 3.9. The dimensions and position of reinforcement and embedded products, as well as the thickness of the concrete cover to the reinforcement should be determined in accordance with GOST 17625 and GOST 22904. In the absence of the necessary instruments, cutting of grooves and exposure of the slab reinforcement with subsequent sealing of the grooves is allowed.4. TRANSPORTATION AND STORAGE
4.1. Slabs should be transported and stored in accordance with the requirements of GOST 13015.4 and this standard. 4.2. Plates should be transported and stored in a working (horizontal) position in stacks with the plates resting on four points. The height of the slabs stack during storage should not exceed 2.5 m. 4.3. Spacers under ribbed plates with a flat horizontal top surface and spacers between them in a stack should be placed vertically one under the other at a distance of no more than 500 mm from the end of the plate. Shims and spacers under flat slabs should be positioned in the base of the slab. 4.4. The storage and transportation of slabs with a flat gable or vaulted top surface should be carried out using special devices that provide a description of the slabs in the area of \u200b\u200bsupporting embedded products or steel anchors (in shell slabs) on console tables or metal beams. When storing slabs in one row in height on a leveled floor surface, wooden spacers with a width of 200 mm should be laid under corner embedded products or anchors; all spacers must have the same thickness of at least 50 mm. 4.5. Lifting slabs with a length of 6 m or more should be carried out with special traverses (with gripping by mounting loops or slinging parts), which ensure uniform distribution of the load on all four loops of the lifted plate and ensure that the loop is not bent and that the slings are inclined in accordance with Fig. 1. It is allowed to lift slabs 6 m long with four-branch slings with an angle of inclination of the slings of at least 45 to the horizon.
Heck. 1 4.6. Ribbed and flat slabs up to 3 m in length should be transported stacked and secured against displacement with guy wires by the slabs mounting loops. When transporting slabs longer than 3 m by rail, it is not allowed to use loading schemes that provide for fastening a stack of slabs with stretch marks tied to the mounting loops of the slabs.
ATTACHMENT
Mandatory
SHAPE AND BASIC DIMENSIONS OF PLATES
table 2
|
Plate size designation |
The main slab dimensions, mm |
Slab drawing number |
Designation of a series of working drawings or a standard |
|||||||
|
support height |
||||||||||
|
Plates of types PG, PV, PF, PS, PL |
||||||||||
|
Plates of types POG, POV, POF, POS, POL |
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|
Plates of types PR, PP |
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Plate of standard size 1PG6
Heck. 2
Plate of standard size 1PV6 with an opening of 400, 700 or 1000 mm in diameter
Heck. 3
Plate of standard size 2PG6
Heck. 4
Slab of standard size 2PV6 with an opening of 400, 700 or 1000 mm in diameter
Heck. five
Plate of standard size 3PG6
Heck. 6
Plate of standard size 3PV6
With an opening with a diameter of 400 or 700 mm
With an opening with a diameter of 1000 or 1450 mm
Heck. 7
Slab of standard size 3PF6 with aperture size 2600 ´ 2700 mm
Plate of standard size 3 PLv
Heck. eight
Heck. nine
Plate of standard size 4PG6
Heck. ten
Slab of standard size 4PV6 with an opening with a diameter of 400, 700 or 1000 mm
Heck. eleven
Plate of standard size 4PF6
With one opening with dimensions 1200 ´ 1700 mm
With two openings, dimensions 1200 ´ 1700 mm
Heck. 12
Plate of standard size 4PL6
Heck. 13
Plate of standard size 1PG12
Heck. fourteen
Plate of standard size 1PV12
With an opening with a diameter of 400, 700 or 1000 mm
Heck. fifteen
With an opening with a diameter of 1450 mm
Heck. fifteen (continued)
Plate of standard size 1PF12
With four openings size 1500 ´ 1700 mm.
With two openings with dimensions 2600 ´ 2700 mm
Heck. sixteen
Plate of standard size 1PL12
Heck. 17
Plate of standard size 2PG12
Heck. 18
Plate of standard size 2PV12
With an opening with a diameter of 400 or 700 mm
Heck. nineteen
FROM aperture diameter 1000 or 1450 mm
Heck. nineteen (continued)
Plate size 2PF12
With four openings of 1500 ´ 1700 mm
With two openings, dimensions 2600 ´ 2700 mm
Heck. 20
Plate of standard size 2PL12
Heck. 21
Plate of standard size 1PG18
Heck. 22
Slab of 1PV18 standard size with an opening located in the end part of the slab
Opening with a diameter of 400, 700 or 1000 mm
Opening with a diameter of 1450 mm.
Heck. 23
Slab of standard size 1PV18 with an opening located in the middle of the slab
Opening, diameter 400, 700 or 1000 mm
Opening with a diameter of 1450 mm
Heck. 24
Slab of standard size 1PF18 with openings of 1400 ´ 1700 mm
FROM four openings
With two openings
Heck. 25
Slab of 1PF18 standard size with openings 2800 ´ 2700 mm
FROM two openings
With one opening
Heck. 26
Plate of standard size 1PS18
Heck. 27
Plate of standard size 1PL18
Heck. 28
Plate of standard size POG18
Heck. 29
Plate of standard size POV18
With one opening with a diameter of 400, 700, 1000 or 1450 mm
With two openings with a diameter of 400, 700, 1000 or 1450 mm
Plate of standard size 1PP
Heck. 38
Plate standard size 2PP
Heck. 39
Plate of standard size 3PG12
Plate of standard size 3PV12
Plate of standard size 3PL12
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Central Scientific Research and Design Experimental Institute of Industrial Buildings and Structures (TsNIIpromzdaniy) of the USSR State Construction Committee CONTRACTORS V. A. Bazhanova (topic leader); A. Ya. Rosenblum; N. M. Grimailo; G. I. Berdichevsky, dr tech. sciences; A. Svetov, Cand. tech. sciences; M.G. Korevitskaya, Cand. tech. sciences; L. S. Siannut, Cand. tech. sciences; V.A.Kozlov; A. P. Duzhak; M. A. Yankelevich, Dr. Tech. Sciences A. D. Lieberman, Ph.D. tech. sciences; A. V. Shapiro; I. N. Kotov; V. I. Pimenov; E. I. Sergovskaya; V. I. Denytsikov (Changed edition). 2. APPROVED AND PUT INTO EFFECT by the Decree of the State Construction Committee of the USSR dated 27.02.89 No. 3 3. Introduced for the first time 4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS|
Number of paragraph, sub-paragraph, application |
Item number, sub-item, application |
||
| GOST 5781-82 | GOST 17623-87 | ||
| GOST 6727-80 | GOST 17624-87 | ||
| GOST 7348-81 | GOST 17625-83 | ||
| GOST 10060-87 | GOST 18105-86 | ||
| GOST 10180-78 | GOST 22362-77 | ||
| GOST 10181.0-81 | GOST 22690-88 | ||
| GOST 10181.3-81 | GOST 22701.0-77- | ||
| GOST 10884-81 | GOST 22701.5-77 |
attachment |
|
| GOST 10922-75 | |||
| GOST 12730.0-78 | GOST 22701.6-79 | ||
| GOST 12730.1-78 | GOST 22701.7-81 | ||
| GOST 12730.5-84 | GOST 22904-78 | ||
| GOST 13015.0-83 | GOST 23009-78 | ||
| GOST 13015.1-81 | GOST 23858-79 | ||
| GOST 13015.2-81 | GOST 25820-83 | ||
| GOST 13015.4-84 | GOST 26433.0-85 | ||
| GOST 13840-68 | GOST 26433.1-89 | ||
| GOST 14098-85 | GOST 26633-85 |
During the construction of almost all buildings, floor slabs are used to arrange horizontal lintels and ensure the structure of the required rigidity. This method allows for faster assembly and significant cost savings. Ribbed U-shaped panels, with equal flat parameters, significantly benefit from lightness and flexibility, which makes them popular in the construction of houses.
To perform various works, certain types of floors are used. In the construction of residential buildings, flat, solid or hollow slabs are irreplaceable, and ribbed slabs for industrial buildings. Such ceilings are made by pouring concrete mixture into a metal mold, in which a frame is assembled from preheated rods and a reinforcing mesh and installed mounting loops. Additional strength is achieved due to the compaction of the mixture by vibration, followed by temperature-humidity treatment and drying of the concrete within 4 weeks.
Standard U-shaped floor slabs, designed for heavy loads, are made of high quality concrete with mandatory reinforcement. A design feature is the presence of ribs that are located in one or two directions from the bottom of the flat surface. The U-shape provides maximum strength under bending load, but the resulting ribbed bottom narrows the scope of such slabs: in residential buildings, they are usually used only for attics and basements, where such an uneven ceiling is allowed. These panels are also popular for garage roofs.
Parameters, marking
In order to ensure the qualities necessary for the construction of the object, the technical characteristics of the floor slabs must meet the standard requirements:
- made from heavy or lightweight concrete;
- permissible operating temperature - from -40 to +50 ˚С;
- use in areas of seismic activity up to 9 points;
- use of class A-III fittings.
Several modifications of concrete products are produced, depending on the installation method: 1P rest on the shelves of the building's crossbars, and 2P are placed on top of the supports. The marking of u-shaped slabs indicates: name, standard sizes, class of reinforcement used in the manufacture, type of concrete, design bearing capacity and data on holes for installation of ventilation.
Varieties and sizes
Typical panel dimensions are 3x6 or 3x12 m, with a height of 300 or 400 mm. It is also provided for the execution of additional slabs, 1.5 m wide. They have a mass in the range from 1.3 to 2.5 tons, based on the components used. The following are selected: configuration, dimensions and weight of U-shaped slabs, in accordance with the features of the building structure and the possibility of delivery to the installation site from production. Depending on the purpose and availability of technological holes, there are several types:
- PV - with an opening in the shelf for the fan air duct;
- PRTm designed for operation under heavy loads; are made only of heavy concrete with the use of stressed reinforcement;
- PL - slabs for the installation of an easily dropable roof;
- PF - with holes for inserting skylights;
- PKZH - large-panel reinforced concrete floors increased strength;
- PG - such plates have a U-shaped trapezoidal section without additional holes or recesses;
- П and ПР - general designation of ribbed plates.
When calculating floors, the operating conditions of the building, climatic and seismological features, types of loads acting on the structure are taken into account.
Storage and transportation
Finished U-shaped products should be stacked by marks on a horizontal surface. Wooden planks are placed under the bottom layer and between the individual panels. During transportation, the slabs are positioned in a working position, separated by spacers and rigidly attached to prevent displacement. For transportation, vehicles specially equipped for oversized cargo are used.
Installation features
When laying large reinforced concrete products, a tower or automobile crane is used. If a floor slabs made of u-shaped plates, you need a technique designed to lift a load of the corresponding weight to the desired height. Fastening is carried out using loops for rigging and installation work.
Overlaps are installed in several stages:
- The surfaces or ends on which the panels will be mounted are covered with a layer of fresh grout.
- The panel is hung on the hook in a horizontal position using four slings and lifted to the required height.
- The hanging plate is leveled and put in place. It is important to carry out these works quickly, without allowing the cement to solidify.
- All panels are laid evenly, maintaining a gap of no more than 70 mm, which is then filled with mortar to obtain a smooth surface.
- Mounting loops of adjacent slabs are fastened with a steel bar, and also attached with anchors to the wall of the house.
The result is a flat, flat surface. In the event that it becomes necessary to remove an unnecessary part, for example, to shorten a slab or cut a hatch, you can use a simple grinder with discs for concrete and metal (for cutting reinforcement) and scrap.
The cost of reinforced concrete products
Special requirements are imposed on the production of floors. Not every reinforced concrete structure is able to ensure the production of such large-sized U-shaped products in compliance with all strength parameters. In addition, only high-quality concrete and special fittings are used in their manufacture, which noticeably affects the cost of the finished product.
| Brand | Length, mm | Width, mm | Height, mm | Weight, kg | Price, rubles |
| 2PG6-3A | 5 970 | 1 490 | 300 | 1 500 | 1 300 |
| 2PV6-5A-VT | 17 000 | ||||
| 2PV6-5atVt | 2 000 | 21 000 | |||
| 3PG6-5atVt | 2 980 | 2 680 | 37 000 | ||
| 3PV6-5atVt | 3 200 | 49 000 |
Usually, each ZhBK provides a price list for its product, which has a tabular form. The cost of u-shaped floor slabs reinforced with heat-hardened steel of the V class is quite high, but the strength characteristics justify it. If you plan to install it in uncritically critical places, you can buy used floor slabs, their price will be much lower than new ones (from 500 rubles per 1 m2).
Especially critical structures used in multi-storey construction should be selected exclusively by specialists with the appropriate qualifications. Only with the correct choice of the parameters of the floor panels is the strength of the finished structure guaranteed.
GOST 28042-2013
INTERSTATE STANDARD
REINFORCED CONCRETE COVERING PLATES FOR BUILDINGS AND STRUCTURES
Technical conditions
Reinforced concrete roofings slabs for industrial buildings. Specifications
ISS 91.080.40
OKSTU 5841
Introduction date 2015-01-01
Foreword
The goals, basic principles and procedure for carrying out work on interstate standardization are established by GOST 1.0-92 "Interstate standardization system. Basic provisions" and GOST 1.2-2009 "Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Rules for development, adoption, application , updates and cancellations "
Information about the standard
1 DEVELOPED by the Central Scientific Research and Design and Experimental Institute of Industrial Buildings and Structures (JSC "TsNIIPromzdaniy")
2 INTRODUCED by the Technical Committee for Standardization TK 465 "Construction" Russian Federation
3 ACCEPTED by the Interstate Council for Standardization, Metrology and Certification (minutes of November 14, 2013 N 44-P)
Voted for adoption:
Short name of the country according to MK (ISO 3166) 004-97 | Abbreviated name of the national standardization body |
|
Ministry of Economy of the Republic of Armenia |
||
Kazakhstan | Gosstandart of the Republic of Kazakhstan |
|
Kyrgyzstan | Kyrgyzstandard |
|
Moldova-Standard |
||
Rosstandart |
||
Tajikistan | Tajikstandart |
|
Uzbekistan | Uzstandart |
(Amendment. ICS N 4-2016).
4 By order of the Federal Agency for Technical Regulation and Metrology N 2391-st of December 30, 2013. put into effect as a national standard of the Russian Federation from January 01, 2015
5 REPLACE GOST 28042-89
Amendment published in IUS N 4, 2016
Corrected by the manufacturer of the database
Information about changes to this standard is published in the annual information index "National standards", and the text of the changes - in the monthly information index "National standards". In case of revision (replacement) or cancellation of this standard, a corresponding notice will be published in the monthly information index "National Standards". Relevant information, notice and texts are also posted in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet.
1 area of \u200b\u200buse
1 area of \u200b\u200buse
1.1 This standard establishes technical requirements, control methods and rules for acceptance, transportation and storage of reinforced concrete ribbed and flat slabs made of heavy or structural lightweight concrete.
1.2 Plates are used in the coatings of buildings of enterprises of all industries and the national economy, with the exception of residential and public buildings.
2 Normative references
This standard uses normative references to the following interstate standards:
GOST 5781-82 Hot-rolled steel for reinforcing reinforced concrete structures. Technical conditions
GOST 6727-80 Cold-drawn low-carbon steel wire for reinforcing reinforced concrete structures. Technical conditions
GOST 7348-81 Carbon steel wire for reinforcement of prestressed reinforced concrete structures. Technical conditions
GOST 8829-94 Prefabricated reinforced concrete and concrete building products. Loading test methods. Rules for assessing strength, stiffness and crack resistance
GOST 10060.0-95 Concrete. Methods for determining frost resistance. General requirements
GOST 10060.1-95 Concrete. Basic method for determining frost resistance
GOST 10060.2-95 Concrete. Accelerated methods for determining frost resistance with repeated freezing and thawing
GOST 10180-2012 Concrete. Methods for determining the strength of control samples
GOST 10181-2000 Mixtures concrete test methods
GOST 10884-94 Reinforcing steel thermomechanically hardened for reinforced concrete structures. Technical conditions
GOST 10922-90 Welded reinforcement and embedded products, welded joints of reinforcement and embedded products of reinforced concrete structures. General specifications
GOST 12730.0-78 Concrete. General requirements for methods for determining density, moisture, water absorption, porosity and water resistance
GOST 12730.1-78 Concrete. Density determination methods
GOST 12730.5-84 Concrete. Methods for determining water resistance
GOST 13015-2012 Reinforced concrete and concrete products for construction. General technical requirements. Rules for acceptance, labeling, transportation and storage
GOST 13840-68 Steel reinforcing ropes 1x7. Technical conditions
GOST 16504-81 System of state product testing. Product testing and quality control. Basic terms and definitions
GOST 17623-87 Concrete. Radioisotope method for determining the average density
GOST 17624-87 Concrete. Ultrasonic method for determining strength
GOST 17625-83 Reinforced concrete structures and products. Radiation method for determining the thickness of the concrete cover, dimensions and location of reinforcement
GOST 18105-2010 Concrete. Rules for control and assessment of strength
GOST 22362-77 Reinforced concrete structures. Rebar tensile force measurement methods
GOST 22690-88 Concrete. Determination of strength by mechanical methods of non-destructive testing
GOST 22904-93 Reinforced concrete structures. Magnetic method for determining the thickness of the concrete cover and the location of the reinforcement
GOST 23858-79 Butt welded joints and T-shaped reinforcement of reinforced concrete structures. Ultrasonic quality control methods. Acceptance rules
GOST 25820-2000 Light concretes. Technical conditions
GOST 26134-84 Concrete. Ultrasonic method for determining frost resistance
GOST 26633-91 Heavy and fine-grained concrete. Technical conditions
GOST 32499-2013 Reinforced concrete hollow-core floor slabs for buildings with a span of up to 9 m, bench molding.
Note - When using this standard, it is advisable to check the operation of reference standards in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or according to the annual information index "National Standards", which was published as of January 1 of the current year, and by releases of the monthly information index "National Standards" for the current year. If the referenced document is replaced (changed), then when using this standard should be guided by the replacing (modified) document. If the reference standard is canceled without replacement, then the provision in which the reference to it is given applies to the extent that does not affect this reference.
3 Terms and definitions
In this standard, the following terms are used with the corresponding definitions, as well as GOST 32499 and GOST 21506:
4 Technical requirements
4.1 General requirements
4.1.1 The use of plates under conditions of constant exposure to temperatures above plus 50 ° C, as well as in unheated buildings and in the open air at a design temperature of the outside air below minus 40 ° C is allowed subject to additional conditions established by the current regulatory documents.
4.1.2 The use of slabs in areas with a seismicity of 7 or more points is allowed provided that the requirements of the current regulatory documents are met.
4.1.3 The use of plates in conditions of low and medium aggressive degree of influence of a gaseous medium on reinforced concrete structures allowed provided that the requirements of the current regulatory documents are met.
4.2 Basic parameters and dimensions.
4.2.1 Plates should be manufactured in accordance with the requirements of this standard, design and technological documentation, approved in the prescribed manner.
It is allowed to manufacture slabs that differ in types and sizes from those given in this standard, according to the approved specifications and the corresponding working drawings, subject to the remaining requirements of this standard.
4.2.2 Reinforced concrete ribbed slabs with coordination dimensions 1.5x12, 3x12, 1.5x6 and 3x6 m are made prestressed, and additional ribbed and flat ones with non-tensioned reinforcement.
4.2.3 Prestressed slabs are classified into the following types:
- PG - without openings in the shelf of the slab, with an upper flat (horizontal or gable) surface;
- PV - with openings in the shelf of the slab for the passage of ventilation shafts with deflectors or umbrellas, as well as air ducts of roof fans with an upper flat (horizontal or gable) surface;
- PF - with openings in the slab shelf for installing skylights with an upper flat (horizontal or gable) surface;
- PS - with openings in the shelf of the slab for the installation of light-aeration lights with an upper flat (horizontal or gable) surface;
- PL - with openings in the shelf of the slab for the installation of an easily dropable roof with an upper flat (horizontal or gable) surface.
4.2.4 Plates with stress-free reinforcement are manufactured without openings in the shelf and are divided into the following types:
- PR - ribbed;
- PP - flat.
4.2.5 The shape and main dimensions of the slabs must correspond to the values \u200b\u200bindicated in tables 1 and 2.
Table 1
Plate size designation | The main dimensions of the slab, mm | Plate number in table 2 | Designation of a series of working drawings or a standard |
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Support height | |||||
Notes 1 Plates marked with a "*", namely 10, 11, 12, 13, 14, 15 have in table 2 in brackets the second option for the dimensions of the plates due to an increase in the thickness of their shelf by 5 mm in the cases indicated in the working drawings on these plates; 2 Additional dimensions of slabs are given in,,,,. |
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table 2
General view of the plate | Slits |
1 Plate of standard size 3PG12 |
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2 Slab of standard size 3PV12 with an opening with a diameter of 400, 700 or 1000 mm |
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3 Plate of standard size 3PL12 |
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4 Plate of standard size 1PG12 |
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5 Slab of standard size 1PV12 with an opening of 400, 700 or 1000 mm in diameter |
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6 Plate of standard size 1PV12 with an opening with a diameter of 1450 mm |
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7 Slab of standard size 1PF12 with four openings with dimensions of 1500x1700 mm |
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8 Plate of standard size 1PF12 with two openings with dimensions of 2600x2700 mm |
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9 Plate of standard size 1PL12 |
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10 Plate of standard size 2PG12 |
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11 Plate of standard size 2PV12 with an opening of 400 or 700 mm in diameter |
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12 Plate of standard size 2PV12 with an opening with a diameter of 1000 or 1450 mm |
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13 Slab of standard size 2PV12 with four openings with dimensions of 1500x1700 mm |
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14 Plate of standard size 2PF12 with two openings with dimensions 2600x2700 mm |
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15 Plate of standard size 2PL12 |
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16 Plate of standard size 4PG6 |
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17 Slab of standard size 4PV6 with an opening of 400, 700 or 1000 mm in diameter |
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18 Plate of standard size 4PF6 with one opening with dimensions 1200x1700 mm |
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19 Slab of standard size 4PF6 with two openings with dimensions 1200x1700 mm |
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20 Plate of standard size 4PL6 |
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21 Plate of standard size 3PG6 |
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22 Slab of standard size 3PV6 with openings of 400 or 700 mm in diameter |
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23 Slab of standard size 3PV6 with openings 1000 or 1450 mm in diameter |
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24 Plate of standard size 3PF6 with one opening with dimensions 2600x2700 mm |
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25 Plate of standard size 3PL6 |
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26 Plate of standard size PR3 |
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27 Plate size PR1 |
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28 Plate size 1PP |
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29 Plate of standard size 2PP |
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4.2.6 In the cases provided for by the building design, the working drawings of the slabs may have additional holes, cutouts in the shelves, depressions on the outer faces of the longitudinal ribs for installing concrete dowels between adjacent slabs, as well as additional embedded products, subject to the other requirements of the standard.
4.2.7. The dimensions of the ledges on the longitudinal edges should be taken as shown in Figure 1.
and - plates 3PG12, 3PV12, 3PL12; b - plates 1PG12, 1PV12, 1PF12, 1PL12; in - plates 2PG12, 2PV12, 2PF12, 2PL12; r - plates 4PG6, 4PV6, 4PF6, 4PL6; d - plates 3PG6, 3PV6, 3PF6, 3PL6
Figure 1 - Dimensions of ledges on the longitudinal edges of the slabs
4.3 Board characteristics
4.3.1 Plates must meet the design requirements for strength, stiffness and crack resistance at the stages of operation, transportation and storage, and when tested by loading, they must withstand the control loads specified in the design documentation.
4.3.2 Plates must meet the requirements of GOST 13015:
- in terms of actual concrete strength (at design age, transfer and release);
- for frost resistance of concrete, and for slabs operated under the condition of exposure to an aggressive gaseous medium - also for water resistance of concrete;
- in terms of average density of lightweight concrete;
- to steel grades for reinforcement and embedded products, including for mounting loops;
- by the thickness of the concrete cover;
- for protection against corrosion.
4.3.3 The bearing capacity of a specific slab depends on the class of prestressing reinforcement, the type and class of concrete and is determined by the author of the building (structure) project according to the regulatory documents in force during the period of application.
4.4 Material requirements
4.4.1 Slabs should be made of heavy concrete of average density from 2200 to 2500 kg / m inclusive in accordance with GOST 26633 or lightweight concrete of dense structure of average density from 1800 to 2000 kg / m inclusive in accordance with GOST 25820, classes of concrete compressive strength specified in working drawings of these plates.
4.4.2 The transfer of the compression forces to the concrete (release of tension of the reinforcement) should be carried out after the concrete has reached the required transfer strength.
The normalized transfer strength of concrete of prestressed slabs (the strength of concrete at the moment of its compression, controlled similarly to the class of concrete in terms of compressive strength) is set depending on the class of concrete, the type and class of prestressed reinforcing steel, the magnitude of the pretension and is assigned in the working drawings for these plates but at least 15 MPa and at least 50% of the accepted compressive strength class of concrete are taken.
4.4.3 The normalized tempering compressive strength of concrete is taken to be equal to the normalized transfer strength, but not less than 70% of the design.
When slabs are supplied to the consumer during the cold season or when transported by rail, the normalized tempering strength of concrete can be increased to 85% of the concrete compressive strength class.
The normalized tempering strength of concrete must correspond to the value specified in the design documentation for a specific building or structure and in the order for the manufacture of slabs in accordance with the requirements of GOST 13015.
4.4.4 For slabs operated at low and medium aggressive exposure to a gaseous medium, concrete should be used that meets the requirements established by the design documentation (in accordance with the current regulatory documents) and specified in the order for the manufacture of slabs.
4.4.5 For the reinforcement of slabs it is recommended to use the following types and reinforcement classes:
- as prestressing reinforcement - hot-rolled thermomechanically hardened reinforcement with a periodic profile of classes A600, A800 and A1000 (GOST 10884 _______________
In the Russian Federation, A500C class fittings are manufactured in accordance with GOST R 52544.
4.4.6 It is allowed to use as prestressing reinforcement of slabs reinforcement of class A400, strengthened by hood, with control of the stress value and ultimate elongation, or control of only the value of elongation (without stress control).
4.4.7 The values \u200b\u200bof stresses in prestressing reinforcement, controlled after the end of tension of the reinforcement on the stops, must correspond to those indicated in the design documentation.
Values \u200b\u200bof actual stress deviations in prestressing reinforcement should not exceed ± 10%.
4.5 Requirements for surface quality and appearance of boards
4.5.1 The shape and dimensions of reinforcement and embedded products and their position in the plates must comply with those specified in the working drawings or standards for these plates and the requirements of GOST 10922.
4.5.2 Deviations from the nominal dimensions of the plates indicated in the working drawings should not exceed the following values:
± 10 mm - along the length of the slabs;
± 5 mm - along the height of the slabs;
± 3 mm - across the thickness of the shelf;
± 6 mm (with a width of up to 2.5 m) and ± 8 mm (with a width of over 2.5 m) - across the width of the slabs.
4.5.3 Deviations from the design position of steel embedded products should not exceed:
10 mm - in the plane of the slab;
5 mm - from the plane of the slab.
4.5.4 Requirements for the quality of surfaces and the appearance of the plates - in accordance with GOST 13015 and this standard.
The dimensions of sinks, local sagging (protrusions), depressions on concrete surfaces and concrete chips of slab ribs should not exceed the limits for the surface categories established in the project for the specific conditions of use of the slabs.
4.5.5 Cracks are not allowed in the concrete of slabs supplied to the consumer, except for:
- shrinkage and other surface technological cracks, the width of which should not exceed 0.1 mm;
- transverse in the upper zone of the longitudinal ribs from concrete compression, the dimensions of which should not exceed those indicated in the working drawings for these slabs;
- transverse in the end ribs, the width of which should not exceed those indicated in the working drawings for these plates.
4.5.6 The ends of prestressing reinforcement should not protrude beyond the end surfaces of the slabs by more than 10 mm, and they should be protected with a layer of cement-sand mortar or bitumen varnish.
4.6 Marking
Plates should be marked in accordance with GOST 13015. Markings and signs should be applied on the outer edge of the end or longitudinal edge of the slab, and for slabs - on the front surface.
5 Acceptance
5.1 Acceptance of plates should be carried out in accordance with GOST 13015 and this standard.
5.2 Plates are accepted according to the data of the incoming, operational and acceptance control, as well as:
- according to the results of periodic tests - in terms of strength, stiffness and crack resistance of slabs, frost resistance of concrete, porosity of a compacted mixture of lightweight concrete, as well as in terms of water resistance of concrete slabs intended for operation in an aggressive gaseous environment;
- according to the results of acceptance tests - in terms of concrete strength (class or grade of concrete in terms of compressive strength, transfer and tempering strength), average density of lightweight concrete, compliance of reinforcement and embedded products with working drawings, strength of welded joints, accuracy of geometric parameters, thickness protective layer of concrete to reinforcement, width of opening of technological cracks, category of concrete surface.
5.3 Periodic loading tests of slabs to control their strength, stiffness and crack resistance are carried out before the start of their mass production and later - when structural changes are made to them or when the manufacturing technology is changed, as well as in the process of serial production of slabs at least once every 6 months.
Loading tests of slabs in the event of structural changes or changes in manufacturing technology may not be carried out by agreement with the design organization - the developer of the slab working drawings.
5.4 A document on the quality of plates supplied to the consumer should be drawn up in accordance with GOST 13015.
In addition, the document on the quality of the slabs should contain the concrete grade for frost resistance, and for slabs intended for operation under the influence of an aggressive gaseous environment, the concrete grade for water resistance.
5.5 Testing of concrete in terms of porosity (volume of intergranular voids) of a compacted lightweight concrete mixture should be carried out at least once a month.
5.6 Plates in terms of the accuracy of geometric parameters, the thickness of the concrete cover to the reinforcement, the category of the concrete surface and the width of the opening of technological cracks should be taken based on the results of random inspection.
or mechanical devices in accordance with GOST 10181 GOST 13015.
6.10 The position of reinforcement and embedded products, as well as the thickness of the concrete cover to the reinforcement should be determined in accordance with GOST 17625 and GOST 22904.
7 Transport and storage
7.1 Slabs should be transported and stored in accordance with the requirements of GOST 13015 and this standard.
Warehousing and storage methods are detailed in the technical specifications of the manufacturers.
The choice of vehicles is carried out at the stage of developing a project for the production of work, taking into account the dimensions of the plates, the distance of transportation, and road conditions.
7.2 Plates should be transported and stored in a working (horizontal) position in stacks with the plates supported on four points.
The height of the slabs stack during storage should not exceed 2.5 m.
7.3 Spacers under ribbed plates and spacers between them in a stack should be placed at the ends of the longitudinal ribs in the places where the supporting embedded products are installed. Shims and spacers under flat slabs should be positioned in the base of the slab.
The width of the spacer is assigned taking into account the crushing strength of the wood. The thickness of the gasket must ensure that there is at least 20 mm clearance from the top of the mounting loop.
7.4 Lifting slabs with a length of 6 m and more should be carried out with special traverses (with a grip by mounting loops or slinging parts), which ensure uniform distribution of the load on all four loops of the lifted slab and ensure that the loop is not bent.
It is allowed to lift slabs 6 m long with four-branch slings with an angle of inclination of the slings at least 45 ° to the horizon (Fig. 2).
Figure 2 - Lifting slabs 6 m long
7.5 Ribbed and flat slabs up to 3 m in length should be transported stacked and secured from displacement with guy wires by the slab mounting loops.
7.6 When transporting slabs with a length of over 3 m by rail, it is not allowed to use loading schemes that provide for securing a stack of slabs with guy wires tied to the mounting loops of the slabs.
7.7 The fixing of the plates should be carried out with the help of racks and tie transverse bars, secured by two pairs of guy wires made of 6 mm wire with six threads. The upper and lower transverse bars are nailed to the racks, the lower bar, in addition, to the platform floor with four nails at least 150 mm long, as shown in Figure 3 GOST 32499.
7.8 For transportation of plates, special trains are also used, the cars of which are equipped with cassettes, welded frames and containers. The design of such a container is shown in Figure 4 of GOST 32499.
Bibliography
Typical RD series 1.465.1-16 | Reinforced concrete slabs ribbed size 1.5x12 m for single-deck roofs industrial buildings |
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Typical RD series 1.465.1-15 | Reinforced concrete ribbed slabs with a size of 3x12 m for covering one-story industrial buildings |
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Typical RD series 1.465.1-20 | Reinforced concrete ribbed slabs 1.5x6 m in size for roofing of one-story industrial buildings |
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Typical RD series 1.465.1-21.94 | Reinforced concrete ribbed slabs of 3x6 m for roofing of one-storey industrial buildings |
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Typical RD series 1.465.1-19 | Small-sized reinforced concrete slabs for covering one-story industrial buildings |
UDC 691.328: 006.354 MKS 91.080.40 OKSTU 5841
Key words: ribbed plate, coating, technical conditions, marking, control methods, transportation and storage, rules for the safe performance of work
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Electronic text of the document
prepared by Kodeks JSC and verified by:
official publication
M .: Standartinform, 2014
Ribbed plate PG-1 AtVIT
Slab without openings in the shelf for the installation of floors of industrial and auxiliary production buildings. A single slab size - 3x6 meters, satisfies most of the typical solutions of industrial facilities with a column pitch of 6 m. A quadrangular slab with stiffening ribs makes it possible to create coatings that can withstand loads of 150 kgf / m2. Overlapping ribbed structures are used today almost everywhere, in cases where it is necessary to arrange reliable overlapping of industrial buildings. Ribbed plate PG.1 AtVIT is suitable for covering both heated and unheated buildings erected in any climatic conditions. The estimated seismicity of objects is permissible up to 9 points inclusive.
Residential construction rarely uses ribbed slabs due to their aesthetic imperfections - the non-standard shape and the presence of protruding beams make the ceilings of future rooms inconvenient. The production of ribbed slabs is foreseen with the prestressing of the reinforcement, such slabs are used to cover beams, trusses, walls and roof structures. If it is necessary to install roof fans and deflectors, it is recommended to buy a ribbed plate with a PV hole.
Tension ribbed slabs withstand static loads much better than conventional flat PC hollow-core slabs. This strength is due to the presence of stiffeners on the longitudinal sides of the slab. The ribbed reinforced concrete slab has a U-shaped section, a height of 370 mm, a shelf thickness of 300 mm. The presence of ribbed floors in an industrial facility can significantly increase the permissible loads on the entire structure. This shape allows the ribbed plate to perform well in bending, but limits the use of the ribbed plate in residential construction. Ribbed plates according to GOST 22701.0-77-22701.5-77. are manufactured taking into account all technological subtleties, under a phased quality control, therefore, the reliability of the PG-1 AtVIT boards is guaranteed by the manufacturer. You will find all manufactured standard dimensions of ribbed concrete slabs on our website, you can buy ribbed slabs for the implementation of any design solutions.
For various objects, reinforced concrete cover slabs are made of heavy concrete or concrete on porous aggregates (this is reflected in the slab marking) with strength M250-M400. As concrete on porous aggregates, expanded clay concrete, angloporite concrete or slag concrete with an average density of 1850 kg / m3 are selected. The choice of a ribbed slab depends on the climatic conditions of the construction and the mode of operation of the slab. Slabs made of heavy concrete are able to withstand maximum loads and resist moisture and corrosive environments well, while slabs based on porous aggregates have a lower mass and thermal conductivity, but are distinguished by high water absorption and less resistance to corrosion. Additives and additives are introduced into the concrete mixture to improve consumer characteristics and increase the service life of the slabs. Plasticizing, gas-entraining and other additives increase the density of the concrete surface of the slab, therefore, ribbed slabs PG.1 AtVIT are distinguished by their durability and wear resistance. For additional secondary protection, the surface of the slab is hydrophobic. Remember that according to GOST 22701.0-77-22701.5-77. , the tempering strength of concrete ribbed slabs is not less than 70% of the brand.
You will find a drawing of a ribbed plate in the standard album of GOST 22701.0-77-22701.5-77. Ribbed coating slabs are produced with a variety of reinforcement, which determines the load-bearing capacity of the slab. Reinforcement with welded meshes and frames made of steel A-III and pre-stressed rods of length 6000 mm from steel At-V, A-VI, At-IVC and A-IV. Ribbed coating plates operating in corrosive environments are reinforced with steel resistant to corrosion cracking. All steel parts of the plate have a protective anti-corrosion coating. Protective coatings also have all embedded products (anchors) and reinforcement outlets that are included in the design of ribbed slabs for connection with frame elements and other floors. In addition, the slab can have embedded products for fixing parapets and fixing slabs to roof structures. The thickness of the concrete cover to the reinforcement is from 1 to 2 cm, depending on the size of the product. Ribbed floor slab price depends on the consumption of steel, concrete, as well as on the complexity of the manufacture of concrete products.
You can buy floor slabs PG-1 AtVIT at affordable prices with delivery to your object right on this page. Add the product to the cart and complete the application. Our managers will help you calculate and place an order.
In addition, the ribbed slab must match its design dimensions. Deviations in length are allowed no more than 6 mm, no more than 5 mm in width and no more than 3 mm in height. Coating slabs along their entire length must maintain straightness and flatness, the maximum deviation can be no more than 5 mm. The deviation of the thickness of the concrete layer to the reinforcement is not more than 3-5 mm. Grease and rust stains are not allowed. Concrete surface the ribbed slab should not have cracks more than 0.1 mm wide (shrinkage), cracks with a larger opening threaten the integrity of the slab. The slab mass fluctuation should not exceed 7%.
On the surface of the ribbed slab there should not be a large number of cavities, sagging and depressions of concrete more than 2 cm, the ribs of the ribbed slab should not be chipped.
After the ribbed slabs have been delivered to the site, carry out acceptancetests. At this point, ribbed slabs are evaluated according to the indicators :
- strength of concrete (class of concrete in terms of compressive strength, transfer and tempering strength),
- medium density lightweight concrete;
- conformity of reinforcement and embedded products;
- strength of welded joints;
- dimensional accuracy;
- concrete cover to reinforcement,
- the presence and width of possible cracks.
- The appearance of the ribbed SG plate.
According to GOST 22701.0-77-22701.5-77. , the batch of ribbed slabs must be accompanied by technical certificate.This document should contain information on all major technical characteristics ribbed slabs, data on the date and material of manufacture of concrete products, and additionally contain also a concrete grade for frost resistance and water resistance (if used reinforced concrete slabs under the influence of aggressive environments). Some manufacturers also provide warranties for their floor slabs.
Transport and storage
Ribbed slabs PG-1 AtVIT, like many other reinforced concrete products, are stored and transported in a horizontal working position. During storage, the stack of ribbed SG plates should not exceed a height of 2.5 meters (no more than 7 plates), in order to avoid destruction of the underlying plates. To maintain the integrity of the plates during transportation, they are securely fixed, excluding the possibility of their displacement. In the places where the supporting and embedded products are located, wooden spacers are placed between the plates, at least 30 mm thick. Careful transportation of ribbed plates without displacement and impact will ensure the delivery of products to assembly in one piece. The logistics department of our company provides delivery of dimensional and oversized plates to any part of the country.
