REINFORCEMENT WIRE HAVING SPIRAL PROFILE

Abstract

The invention can be used in producing prestressed reinforcement for reinforcing items made of concrete and provides maximally strong adhesion to concrete in any potentially possible direction of displacement, and a high level of specific strength, relaxation resistance and fatigue resistance. In a reinforcement wire having a spiral profile, three ruled surfaces, separated from one another by the areas of the cylindrical surface, are applied on the surface of the wire along a spiral line. Trapezoidal projections are disposed on the ruled surfaces at an incline in a direction reversed to the direction of the spiral line along which the ruled surfaces themselves are arranged.

Claims

1. A reinforcement wire having spiral profile, having a triangular section with rounded angles, the ribs and the faces of the wire, which are formed by the rounded angles and the sides of the triangle, respectively, being disposed helically, and a periodic profile in the form of inclined trapezoidal projections with rounded transition areas being formed on the surface of the faces along the line of their positioning.

2. The reinforcement wire according to claim 1, wherein the section is in the shape of a quadrangle with rounded angles.

3. The reinforcement wire according to claim 1, wherein the section is in the shape of an oval.

4. The reinforcement wire according to claim 1, wherein the faces are convex.

5. The reinforcement wire according to claim 1, wherein the faces are concave.

Description

[0011] The invention is explained by drawings.

[0012] FIG. 1 schematically illustrates an outer appearance of a reinforcement wire having spiral profile;

[0013] FIG. 2 schematically illustrates the cross section of a reinforcement wire having spiral profile.

[0014] The reinforcement wire having spiral profile according to one of the embodiments of the invention is given in FIG. 1, 2. On the surface of the wire 1 (FIG. 1, 2) three ruled surfaces 2 separated from one another by the areas of a cylindrical surface 3 are applied along a spiral line. Trapezoidal projections 4 are disposed on the ruled surfaces 2 at an incline in a direction reversed to the direction of the spiral line of positioning of the ruled surfaces 2 themselves.

[0015] The reinforcement wire is manufactured, for example, as follows.

[0016] A wire 1 of circular section is manufactured beforehand. Afterwards, the wire is supplied through the roller cartridge revolving around it, having three inclined rollers that have cylindrical working surfaces with inclined grooves cut out on them. In addition, the ruled surfaces 2 are formed helically on the surface of the wire 1 by the action of the cylindrical rollers, and in the places where grooves are made on the cylindrical surface of the rollers trapezoidal projections 4 are formed opposite to them. On a portion of the wire surface, which is not deformed by rollers, the areas of cylindrical surface 3 are kept.

[0017] Simultaneously with the process of shape change the reinforcement wire being manufactured is tensioned up to a force of 30-70% of the breaking force by any known method, for example, between two capstans each of them being a set composed of a driving pulley and a non-drive pulley, or two driving pulleys. During the interval between passing the first and the second capstans when the reinforcement wire is in a straight-line tensioned state, it is heated up to the temperature of 370-430 degrees, for example, by means of an inductance furnace, followed by forced cooling of the tensioned wire by a water sprayer also in a straight-line tensioned state during the interval between the first and the second capstans.

[0018] Upon completion of cooling the wire passes through the second capstan and is fed to an accumulating unit from which it is wound up in coils or is fed to a scissors where it is cut to specific lengths. Afterwards, the wire wound or cut to specific lengths is packed by the known methods.

[0019] Apart from the described method, the wire may be subjected to shape change in a single process run with a wire drawing operation.