SU1025832A1 - Die-rolled reinforcement wire - Google Patents

Abstract

1. FITTING WIRE OF A PERIODIC PROFILE, containing flat faces with anchoring protrusions on the surface, forming in the cross section the shape of a square with rounded corners, characterized in that, in order to improve its adhesion with concrete and increase manufacturing efficiency, at the base of the anchoring protrusions sloping platforms constituting an obtuse angle with flat edges, not less than 155 °. 2. A wire according to claim 1, characterized in that the inclined platforms smoothly adjoin the changes of the anchoring protrusions along the arc of a circle. 3. Wire on PP. 1 and 2, characterized in that the anchoring protrusions are arranged at an angle to the longitudinal axis of the wire. 4. Wire on PP. 1-3, characterized in that the height of the anchoring protrusions for wire with a diameter of 5 mm is 0.05-0.07 diameter, and for wire with a diameter of more than 5 mm - 0.06-0.08 of its diameter.

Description

This invention relates to shaped reinforcement used to manufacture reinforced concrete structures.

Known reinforcement wire periodic profile containing on the surface of bilateral inserts,. having a saddle section and a depth of from 3 to 9% of the diameter of the wire 1.

The disadvantage of this reinforcing wire is a significant weakening of its cross section due to the large depth of the socket and their location against each other, which reduces the strength of the wire.

Closest to the present invention is a reinforced steel wire of a periodic profile, containing flat faces with anchoring protrusions on the surface, forming in the cross section the shape of a square with rounded corners 2.

Known reinforcement wire is not sufficiently coupled with concrete. In addition, when rolling a periodic profile onto this wire, dynamic loads on the process equipment arise, which reduces the manufacturability of its manufacture.

The purpose of the invention is to improve the adhesion of reinforcement wire to concrete and improve the manufacturability of its production.

The goal is achieved by the fact that in a reinforcing wire a periodic profile containing flat faces with anchoring protrusions on the surface, forming a cross-sectional square shape with rounded corners, at the base of the anchoring protrusions there are sloping platforms that are not less than 155 °

The sloping areas smoothly adjoin the walls of the anchoring protrusions along the arc of a circle.

Anchoring protrusions are located at an angle of 40-55 ° to the longitudinal axis of the wire.

(

The height of the anchoring protrusions for wire with a diameter up to 5 mm is 0.05-0.07 diameter, and for wire with a diameter greater than 5 mm, 0.06-0.08 of its diameter.

In FIG. 1 shows reinforcement wire, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. one.

The reinforcement wire 1 contains flat faces 2 on the surface with anchoring protrusions 3, which form a square 4 in cross section with rounded corners 5. At the base of the anchoring protrusions 3, inclined platforms 6 are formed, the components with flat edges 2 are obtuse angle Lne less than 155 ° . The inclined platforms 6 smoothly adjoin the walls of the anchoring protrusions 3 along the arc of a circle R. The anchoring protrusions are located at an angle ft 45-55 ° to the longitudinal axis of the wire. For wire with a diameter of D .5 mm, the height h of the anchoring protrusions (0.05-0; 06) D, and

for wire with a diameter greater than 5 mm (0.06-0.08) D.

Improving the adhesion of wire to concrete is achieved due to the fact that

The bases of the protrusions of the flat faces of the wire are inclined platforms that form an obtuse angle of at least 155 ° with the surface of the wire in the longitudinal direction. Violation of adhesion between reinforcement and concrete occurs as a result of cutting the concrete, which is located between the protrusions, on surfaces that are coaxial with reinforcement. It is known that for fragile materials, such as concrete, the magnitude of the critical shear stress at which occurs

 destruction increases with increasing normal pressure acting on the shear surface. The longitudinal force acting on the reinforcement causes its displacement relative to the concrete. In this case, the sloping protrusion areas work like a wedge, so that normal stresses occur on the shear surfaces and the concrete's shear resistance increases, and therefore improves the adhesion of the reinforcement to the concrete. Test the quality of adhesion to concrete reinforcing wire described

5 of the periodic profile shows that at an angle between the inclined base of the protrusion and the surface of the wire is less than 155, the effect of improved adhesion decreases.

The reduction in the dynamic loads of the npif knurling profile is achieved by the fact that the inclined pads at the base of the protrusions smoothly mate with their walls along circular arcs. t

The reduction of dynamic loads is also achieved due to the fact that the protrusions on the surface of the wire are at an angle of 40-55 ° to its axis, so that the front and rear walls of the protrusion are formed not by impact, but gradually, as Q passes the wire between the rolling rollers. When the angle of inclination of the protrusion is less than 40 °, the stiffness of adhesion of the reinforcement to the concrete is noticeably deteriorated, and when the angle of inclination of the protrusions is more than 55 °, the variable (dynamic) component of the equipment load increases dramatically.

Improving the adhesion of the wire to the concrete can also be achieved by increasing the height of the protrusions, but this reduces the plastic characteristics of the wire.

For reinforcing wire, an optimum combination of its adhesion characteristics with concrete and plastic properties is achieved if the height of the protrusions is within 0.06-0.07 diameter for a wire with a diameter up to 5 mm and 0.06-0.08 diameter for a wire with a diameter 6 mm and more. The effect of the parameters of the periodic wire profile on the magnitude of the dynamic loads is determined by strain gauging the process of knurling, and the effect of the profile parameters on

the quality of adhesion of reinforcement to concrete - according to the results of tests for pulling reinforcement from a concrete prism.

XI -4,

Claims (4)

1. REINFORCED BAR WIRE WIRE, containing on the surface flat faces with anchoring protrusions, forming in cross section a square shape with rounded corners, characterized in that, in order to improve its adhesion to concrete and increase manufacturability, at the base anchoring protrusions formed inclined platform, making up with flat faces obtuse angle, not less than 155 °. 2. The wire along π. 1, characterized in that the inclined platform smoothly interfaced with shifts of anchoring protrusions along an arc of a circle. 3. The wire according to paragraphs. 1 and 2, characterized in that the anchoring protrusions are located at an angle of 40- ^ 55 ° to the longitudinal axis of the wire. 4. The wire according to paragraphs. 1-3, characterized in that the height of the anchoring protrusions for a wire with a diameter of up to 5 mm is 0.05-0.07 diameter, and for a wire with a diameter of more than 5 mm - 0.06-0.08 of its diameter. SU,.,. 1025832 d) ί