The normative act defines the production of road slabs of 9 different forms (4 of which are additional ones) designed for H-30 and H-10 car loads (vehicle tonnage). GOST also contains the main parameters of road slabs. High-strength heavy-duty concrete slabs with heavy reinforcement, designed for the installation of a cathedral pavement for permanent and temporary city roads in any climatic conditions (up to minus 40 °C). The standard describes in detail each standard size and shape of the slab, accompanying reinforced concrete road slabs with drawings, reference information, reinforcement schemes and installation of mounting loops.

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

GOST 21924.0-84 prescribes the production of heavy concrete slabs with a density of 2500 kg / m 3 (compressive strength class B30 and B22.5). The release of the 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 longer than 3 m will already be pre-stressed. The working (top) surface of the road slab should be corrugated to improve bonding with the asphalt applied on top.

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 allows that the plate may have mounting loops, holes for collets or grooves for loopless mounting, while the loops 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 compliance with GOST 13015.0 for the following indicators:

• in terms of the actual strength of concrete (at the design age, tempering and
• transmission);
• to the quality of materials used for the preparation of concrete;
• to the quality of reinforcing and embedded products and their position in the slab;
• by grades of reinforcing steel;
• by steel grades for embedded products and mounting loops;
• by the deviation of the thickness of the protective layer of concrete 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 prescribed in detail in this regulatory act. Transportation and storage of road slabs must be carried out in accordance with the rules of GOST 21924.0-84.

GOST 21924.0-84

INTERSTATE STANDARDS

REINFORCED CONCRETE PLATES FOR COVERINGS OF CITY ROADS

IPK STANDARDS PUBLISHING HOUSE

INTERSTATE STANDARD

Introduction date 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 for permanent and temporary city roads under the vehicle load H-30 and H-10.

The slabs are used for roads in areas with an estimated outdoor temperature (the average coldest five-day period of the construction area according to SNiP 2.01.01) down to minus 40 °C incl.

When using plates in the IVA climatic subregion, 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 an estimated outdoor air temperature below minus 40 ° C, subject to the requirements SNiP 2.03.01 to structures intended for operation in these conditions.

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

1. TYPES, MAIN PARAMETERS AND DIMENSIONS

Table 1

Note. The weight of the slabs is given for concrete with an average density of 2500 kg/m3.

table 2

(Revised edition, Rev. No. 1).

Plates for temporary roads are made without mounting brackets Sk1.

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 installation in accordance with drawing. or with holes for collets instead of mounting loops and niches for them. At the same time, in prestressed slabs for permanent roads, instead of mounting loops, it is necessary to install Sk1 brackets in accordance with Fig. (node ​​1). The number of holes for collets and their location is determined based on the technology of manufacturing plates and their installation.

The working surface of the slabs (the upper surface of the road surface) must be corrugated according to drawing. , and the plates produced by this surface "up" should be rough (p.).

Notes:

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

2. It is allowed to manufacture plates with technological bevels in the places of installation of mounting loops and brackets no more than 5 mm, as well as with technological niches under Sk1 brackets with a depth of 20 mm.

3. Inventory slabs for temporary roads are allowed to be manufactured with technological bevels no more than 8 mm.

4. It is allowed to manufacture plates with a general view on the existing equipment, different from that indicated in the drawing. - , while maintaining the overall dimensions of the plate and complying with all other requirements established by this standard.

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

6. For slabs with non-stressed reinforcement, mounting loops may be vertical.

7. It is allowed to shift the mounting loops within the niches from the middle of the slab along its edge to the position of the mirror-replaced hinge bindings (dimensions a and b) damn. .

Slabs with non-stressed reinforcement - in GOST 21924.2.

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

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

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

The slab brand consists of alphanumeric groups separated by a hyphen. The first group contains the plate type designation (p.) and its nominal dimensions in decimeters (with values ​​rounded to the nearest whole number):

For rectangular slabs - length and width;

For trapezoidal plates - length;

For hexagonal slabs - diagonal.

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

For prestressed slabs in the second group of grades, a class of prestressed reinforcing steel is also given.

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

An example of a symbol (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 from 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 ПШ12-30

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

2 P30.18-10

1.5, 1.6. (Revised edition, Rev. No. 1).

2. TECHNICAL REQUIREMENTS

2.2. Plates are subject to manufacture in forms that ensure compliance with the requirements established by this standard for the quality and accuracy of the manufacture of plates.

2.3. Boards shall be factory prepared in accordance with the requirements of this standard.

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

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

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

By grades of reinforcing steel;

By steel grades for embedded products and mounting loops;

According to the deviation of the thickness of the protective layer of concrete to the reinforcement.

(Revised edition, Rev. No. 1).

Concrete must meet the requirements GOST 26633.

(Revised edition, Rev. No. 1).

Thermomechanically and thermally hardened reinforcing steel of classes At - V, At - IV, At - IVC and At - IIIC - GOST 10884 ;

Reinforcing wire class Вр-I - GOST 6727.

(Revised edition, Rev. No. 1).

2.8. Requirements for the accuracy of plate manufacturing

2.8.1. The values ​​of actual deviations of geometric parameters should not exceed the limit values ​​indicated in Table. .

Table 3