GOST 23279-85 (text)

GOST 23279-85

UDC 691.87-427.5:691.714:006.354 Group Zh33

STATE STANDARD OF THE UNION OF THE SSR

WELDED REINFORCING MESH FOR REINFORCED CONCRETE STRUCTURES AND PRODUCTS

General specifications GOST 23279-85

Welded reinforcing meshes for reinforced concrete

structures and products.General specifications

OKP 12 7600

Introduction date 1 January 1986

APPROVED GOST 23279-85 AND INTRODUCED BY Decree of the USSR State Committee for Construction of November 28, 1984 N 194

INSTEAD OF GOST 23279-78

REPUBLICATION. October, 1987

GOST 23279-85 applies to welded flat and roll meshes (hereinafter referred to as meshes) manufactured at construction industry enterprises from reinforcing steel with diameters from 3 to 40 mm inclusive, with rods located in two mutually perpendicular directions and intended for reinforcing prefabricated and monolithic reinforced concrete structures and products.

1. CLASSIFICATION

1.1. Grids are divided into:

according to the diameters of the rods;

according to the location of the working reinforcement.

1.2. Depending on the diameter of the rods, the grids are divided into heavy and light ( masonry grids ).

1.2.1. Heavy meshes are nets having rods with a diameter of 12 mm or more in one direction.

1.2.2. Lightweight meshes are those with longitudinal and transverse rods with a diameter of 3 to 10 mm inclusive.

1.3. According to the location of the working reinforcement, the grids are divided into:

with working fittings in one of the directions (longitudinal or transverse) and distribution fittings in the other direction;

with working fittings in both directions.

2. TYPES, MAIN PARAMETERS AND DIMENSIONS

2.1. Grids are made of the following types (Fig. 1 and 2):

1 - heavy with working fittings in the longitudinal direction, the diameter of which is greater than the diameter of distribution fittings;

2 - heavy with working fittings in both directions;

3 - heavy with working fittings in the transverse direction, the diameter of which is greater than the diameter of the distribution fittings;

4 - light with transverse rods for the entire width of the grid;

5 - light with displaced transverse rods.

heavy grids

Type 1

Type 2

Type 3

Light meshes

Type 4

Type 5

2.2. Grids are made flat or rolled.

Lightweight meshes with longitudinal rods of reinforcing wire with diameters from 3 to 5 mm inclusive are made by roll.

2.3. Grids must have rods of the same diameter in one direction.

2.4. Grids are made with square or rectangular cells.

2.5. The diameters of the working reinforcement of the grids are assigned from the condition necessary for the calculation of the cross-sectional area of the reinforcement.

2.6. The ratio of the smaller diameter of the rod to the larger one must be at least 0.25.

2.7. The main parameters of the grids are given in the table.

Grid Options

1 mm

* According to GOST 23279-85, it is allowed to use a bar spacing of 100 and 300 mm in meshes according to standard design documentation for reinforced concrete structures approved before January 1, 1985.

** It is allowed to use a bar spacing of 300 mm in grids according to the standard design documentation for reinforced concrete structures approved before January 1, 1985.

*** See instructions in point 2.9.

Notes: 1. Heavy meshes of type 1 with a width of 1500 to 3050 mm with longitudinal rods with diameters of 36 and 40 mm and type 3 with a length of 3050 to 6250 mm are manufactured using single-point machines and hanging welding tongs until the production of automated equipment is mastered.

2. By agreement with the manufacturer, it is allowed to use heavy meshes of type 1 and light flat meshes up to 11500 mm long.

3. In light meshes of type 5, the length of the transverse rods is from 0.85 to 0.90 of the width of the mesh.

4. The distances between the longitudinal and transverse rods of light meshes, indicated in brackets, can be taken during a feasibility study.

2.8. The distance between the rods - the main step of the rods in one direction should be taken the same.

2.8.1. In heavy meshes of type 1 for transverse rods at the edge of the mesh, an additional step of 100, 200 and 300 mm is allowed.

2.8.2. In light meshes, in addition to the main step of the rods in the longitudinal direction, it is allowed to use an additional step at the edges of the mesh, as well as at the place of its cutting.

The additional step of the longitudinal rods is taken from 50 mm to the size of the main step in multiples of 10 mm at the edge of the mesh and in multiples of 50 mm at the place where the mesh is cut.

The additional step of the transverse rods is taken from 50 to 250 mm in multiples of 10 mm.

2.9. The dimensions of the outlets of the longitudinal and transverse rods should be taken equal to 25 mm or multiples of 25 mm in accordance with those indicated in the table.

In light meshes made in one strip, the dimensions of the outlets of the longitudinal rods are allowed to be taken from 30 to 200 mm in multiples of 5 mm, and the dimensions of the outlets of the transverse rods are equal to 15, 20 and 30 mm, as well as from 25 to 100 mm in multiples of 25 mm.

2.10. Grids are denoted by marks of the following structure