The normative act determines the production of road slabs in 9 different forms (4 of which are additional), designed for a vehicle load of N-30 and N-10 (tonnage of vehicles). GOST also contains the basic parameters of road slabs. High-strength slabs made of heavy concrete, with powerful reinforcement, designed for the construction of cathedral pavements of permanent and temporary urban roads in any climatic conditions (up to minus 40 ° C). The standard describes in detail each standard size and shape of a slab, accompanying reinforced concrete slabs of roads with drawings, reference information, reinforcement schemes and installation of mounting loops.

The production standards and parameters of rectangular slabs for urban roads are fixed in GOST 21924.2-84 and GOST 21924.2-84. Reinforcement schemes for road slabs are indicated in the drawings of GOST 21924.1-84. The shape and dimensions of reinforcing and assembly-butt elements are in accordance with GOST 21924.3.

GOST 21924.0-84 prescribes to produce slabs of heavy concrete with a density of 2500 kg / m 3 (compressive strength class B30 and B22.5). The production of a road slab is possible in 2 reinforcement options: a road slab up to 3 m long is made with pre-stressed reinforcement, and a slab with a length of more than 3 m will already be pre-stressed. The working (top) surface of the paving slab should be grooved to improve bonding to the overlaid asphalt.

The concrete grade for frost resistance and water resistance of a rectangular road slab (for temperatures up to minus 40 ° C) for permanent roads - F200 and W4, for temporary roads - F150 and W2. GOST 21924.0-84 admits that the plate can have mounting loops, holes for collet grippers or grooves for loopless mounting, while the hinges do not protrude beyond the working surface of the plate edge.

Technical requirements for the production of road slabs include requirements for shapes, readiness, strength, crack resistance, as well as meeting GOST 13015.0 for the following indicators:

• in terms of actual concrete strength (at design age, tempering and
• transmission);
• to the quality of materials used for the preparation of concrete;
• to the quality of reinforcement and embedded products and their position in the plate;
• by grades of reinforcing steel;
• by steel grades for embedded products and mounting hinges;
• by the deviation of the thickness of the concrete cover to the reinforcement.

Separately, GOST 21924.0-84 contains tables of permissible geometric deviations of reinforced concrete slabs. Requirements for the acceptance of products at the stage of readiness and delivery to the consumer are detailed in this regulatory act. Transportation and storage of road slabs should be carried out in accordance with the rules of GOST 21924.0-84.

GOST 21924.0-84

INTERSTATE STANDARDS

REINFORCED CONCRETE PLATES FOR URBAN ROADS

IPK PUBLISHING STANDARDS

INTERSTATE STANDARD

Date of introduction 01.01.85

This standard applies to reinforced concrete prestressed slabs and slabs with non-tensioned reinforcement, made of heavy concrete and intended for the installation of assembly pavements of permanent and temporary urban roads under the H-30 and H-10 automobile load.

Plates are used for roads in areas with a design temperature of the outside air (the average coldest five days of the construction area according to SNiP 2.01.01) up to minus 40 ° C incl.

When using boards in climatic subarea IVA, additional requirements must be taken into account SNiP 2.03.01 to structures intended for operation in the area.

It is allowed to use these plates for roads in areas with a design ambient temperature below minus 40 ° C, subject to the requirements SNiP 2.03.01 to structures intended for use in these conditions.

The standard does not apply to reinforced concrete slabs for internal highways of industrial enterprises, for on-farm highways along SNiP 2.05.07 as well as reusable slabs for temporary roads on construction sites.

1. TYPES, BASIC PARAMETERS AND DIMENSIONS

Table 1

Note. The slab weights are given for concrete with an average density of 2500 kg / m3.

table 2

(Modified edition, Amendment No. 1).

Slabs for temporary roads are made without mounting brackets CK1.

It is allowed not to arrange niches for mounting brackets in these plates.

By agreement with the consumer, it is allowed to manufacture plates of types P and PT with grooves for loopless mounting in accordance with Fig. or with holes for collet gripping instead of mounting hinges and device niches for them. At the same time, in prestressed slabs for permanent roads, instead of mounting loops, it is necessary to install CK1 brackets in accordance with Fig. (node \u200b\u200b1). The number of holes for collet grippers and their location is determined based on the technology of manufacturing the plates and their installation.

The working surface of the slabs (the upper surface of the road surface) must have a corrugation according to Fig. , and the slabs made with this surface "up" must be rough (p.).

Notes:

1. It is allowed to manufacture slabs with a chamfer of no more than 10 mm on the front surface of the slab.

2. It is allowed to manufacture slabs with technological bevels in the places where mounting loops and brackets are installed no more than 5 mm, as well as with technological niches under the CK1 brackets 20 mm deep.

3. Inventory slabs for temporary roads are allowed to be made with technological bevels not exceeding 8 mm.

4. It is allowed to manufacture slabs on operating equipment in a general form different from that indicated in the drawing. - while maintaining the overall dimensions of the slab and observing all other requirements established by this standard.

5. For loopless slabs (Fig.), Changes in the shape of the slabs associated with the technology of their manufacture (presence and dimensions of chamfers, radii of curvature, etc.) are allowed.

6. For slabs with non-tensioning reinforcement, vertical arrangement of mounting loops is allowed.

7. It is allowed to displace the mounting hinges within the niches from the middle of the slab along its edge to the position of the mirror-replaceable hinge bindings (dimensions andand b) damn it. ...

Slabs with tension-free reinforcement - in GOST 21924.2.

1.5. Plates are made with mounting loops and holes for a collet grip (Fig. -) or grooves for loopless mounting (Fig.).

The hinges should not protrude beyond the working surface of the slab edge.

For lifting and installing loopless plates, special gripping devices or collet grippers should be used, the design of which is adopted by the manufacturer in agreement with the consumer and Gosgortekhnadzor.

A slab brand consists of alphanumeric groups separated by a hyphen. The first group contains the designation of the type of slab (p.) And its nominal dimensions in decimeters (with values \u200b\u200brounded to an integer):

For rectangular slabs - length and width;

For trapezoidal plates - length;

For hexagonal slabs, the diagonal.

In the second group, the value of the load for which the plate is designed (p.) Is given.

For prestressed plates in the second group of brands, the class of prestressing reinforcing steel is also given.

The brand of plates manufactured with grooves for loopless mounting or with holes for collet gripping (instead of mounting hinges) is supplemented with the letter B.

An example of a conventional designation (brand) of a slab for permanent roads (type 1), rectangular, 6000 mm long and 1750 mm wide, designed for a car weighing 30 tons, with prestressing reinforcement made of reinforcing steel of class A - V:

1 P60.18-30AV

The same, trapezoidal, 5500 mm long, designed for a car weighing 30 tons, with prestressing reinforcement made of reinforcing steel of class A - IV:

1 PT55-30AV

The same, hexagonal with a side of 1160 mm, designed for a car weighing 30 tons, with non-tensioned reinforcement:

1 PSh12-30

The same, slabs for temporary roads (type 2), rectangular, 3000 mm long and 1750 mm wide, designed for a car weighing 10 tons, with tension-free reinforcement:

2 P30.18-10

1.5, 1.6. (Modified edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.2. Plates are to be manufactured in molds that ensure compliance with the quality and accuracy requirements for the production of plates established by this standard.

2.3. Plates must be manufactured in accordance with the requirements of this standard.

According to the indicators of the actual strength of concrete (at the design age, tempering and transfer);

The quality of the materials used for the preparation of concrete;

To the quality of reinforcement and embedded products and their position in the slab;

By grades of reinforcing steel;

By steel grades for embedded products and mounting hinges;

By the deviation of the thickness of the concrete cover to the reinforcement.

(Modified edition, Amendment No. 1).

Concrete must meet the requirements GOST 26633.

(Modified edition, Amendment No. 1).

Thermo-mechanically and thermally hardened reinforcing steel of the classes At - V, At - IV, At - IVC and At - ILC - GOST 10884 ;

Reinforcing wire of class Вр-I - GOST 6727.

(Modified edition, Amendment No. 1).

2.8. Requirements for the accuracy of making slabs

2.8.1. The values \u200b\u200bof the actual deviations of the geometric parameters should not exceed the limiting values \u200b\u200bindicated in table. ...

Table 3