SU1213155A1 - Reinforcement for concrete - Google Patents

Description

12131

The invention relates to reinforcing elements used for reinforcing reinforced concrete structures.

The purpose of the invention is to increase the adhesion of reinforcement to concrete. 5

FIG. 1 shows armature with one-sided arrangement of ribs; in fig. 2 shows section A-A in FIG. one; in fig. 3 - reinforcement with a bilateral symmetrical arrangement of the ribs; U in FIG. 4 - the same, with the offset position of the ribs on one side of the edge relative to the other; figure 5 - reinforcement with cribried g protrusions in the areas of the sheet between the ribs; 15 in FIG. 6 - armature with variable thickness of the sheet between the ribs.

The reinforcement is a metal sheet 1, on the surface 20 of which, on one or both sides, there are parallel ribs 2, on the surface of which, in turn, transverse projections 3 of a trapezoidal transverse 25 section are formed, the ratio of the height of projections h (to the height edges hj is 0.2-0.6, and the ratio of the distance between the projections to their width b is 3-8.30

When the ratio of the height of the protrusions to the height of the ribs is less than 0.2, a reliable adhesion of the reinforcement to the concrete is not provided;

At a ratio of the distance between the protrusions to their width less than 3, the adhesion of the reinforcement to the concrete decreases, and the likelihood of chipping of the concrete appears, moreover, the metal consumption increases. At a ratio of more than 8, the coupling to concrete is also deteriorated due to a decrease in the area of the surface of the ribs with transverse projections and an increase in the area of concrete A between these projections. 50

The ribs 2 are rounded in shape and, when placed on both sides of the sheet 1, can be symmetrically or offset relative to 552

but the ribs on the other side of the sheet. The sheet sections between the ribs 2 with their symmetrical two-sided arrangement can be made of varying thickness with a decrease to the middle of these sections, which allows using such a sheet as a blank for obtaining core reinforcement by slitting the sheet into sections with minimum thickness. On. parts of the sheet between the ribs 2 can be formed transverse ridge-shaped protrusions 4, which additionally attach the reinforcement to the concrete and increase its rigidity.

During the operation of the reinforcement in the composition of the reinforced concrete structure, the elastic transfer of the tension of its adhesion to the concrete is ensured, due to the elastic work of the 3 concrete consoles formed between the transverse projections under the influence of compressive forces transmitted by the steals. The periodic arrangement of the protrusions. 3 excludes the cutting of the concrete cantilevers at the tops of the protrusions, since the adhesion of the aramutra is caused by the work of the concrete in compression and lubrication.

The cross section of the ribs 2, limited by the radial curve of their rounding, excludes the emergence of fatigue strips during the hardening of the concrete.

The trapezoidal section of the protrusions 3 makes it possible to reduce the width of the protrusions at the top and to have an inclined side surface, which improves the joint operation of the reinforcement and concrete. The bilateral arrangement of the ribs 2 with transverse protrusions 3 allows the use of reinforcement for the internal reinforcement of reinforced concrete structures. Additional ridge-shaped protrusions 4 increase the adhesion of the reinforcement to the concrete and thereby the reliability of the reinforced concrete structures.

The use of the invention provides an increase in the adhesion of the reinforcement to the concrete due to the formation on the metal sheet of additional corrugations in the form of transverse projections on the fins and ridge-shaped projections on the sections of the sheet between the fins.

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Editor I.Nikolaychuk

Compiled by V.Gerasimov O.Vashchishina

Order 758/42 Edition 729

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent Propulsion Uzhgorod, 4 Project

Fi.b

Proofreader A.Zimokosov

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Claims (6)

1. CONCRETE FITTINGS, made in the form of metal ✓ sheet, on the surface of which parallel ribs are located, characterized in that, in order to increase its adhesion to concrete, transverse protrusions of a trapezoidal cross section are formed on the surface of the ribs, while the ratio of the height of the protrusions to the height of the rib is 0.2-0.6 , and the ratio of the distance between the protrusions to their width is 3-8. 2. The reinforcement according to claim 1, characterized in that transverse ridge-shaped protrusions are formed on the sections of the sheet between the ribs. 3. The reinforcement according to claim 1, characterized in that the ribs with transverse protrusions are located on both sides of the sheet. 4. Reinforcement pop. 3, characterized by the fact that the ribs on one side of the sheet are offset with respect to the ribs on the other side of the sheet. 5. Reinforcement pop.Z, characterized in that the ribs on one side of the sheet are located symmetrically with respect to the ribs on the other side of the sheet. 6. The reinforcement according to claim 5, characterized in that the sections of the sheet between the ribs are made of variable thickness with a decrease towards the middle of the sections. Figure 1