CN101481946A - High strength low relaxed prestress die drawing steel strand - Google Patents

Abstract

The invention provides a high strength and underrelaxation prestress die-drawing steel stranded wire which relates to the field of die-drawing steel stranded wires used for prestress reinforced reinforcing ribs and is designed mainly for solving the problems of large pore space of a center hair and each side hair as well as large diameter of the existing prestress die-drawing steel stranded wire. The high strength and underrelaxation prestress die-drawing steel stranded wire comprises the center hair and six side hairs, wherein the section of the center hair is approximately hexagonal, and the sections of the side hairs surrounding the center hair are respectively approximately trapezoidal. The high strength and underrelaxation prestress die-drawing steel stranded wire has the advantages that the pore space of the center hair and each side hair is small, and the diameter of the steel stranded wire is smaller under identical sectional area, strength level and breaking force, thereby reducing the diameter of a concrete pore canal; and in the pore canals with identical diameter, the quantity of the steel stranded wire can be increased, thereby causing the operation of anchoring to be easy, alleviating the scratch of the steel stranded wire caused by an anchor device, improving the safeness of constructional elements and benefiting the enhancement of the safeness and the increase of the service life of the prestressed concrete.

Description

High strength low relaxed prestress die drawing steel strand

Technical field:

The present invention relates to a kind of mould that is used for the prestressed concrete reinforcing rib and pull out steel hinge line.

Background technology:

Existing prestress die drawing steel strand all is made up of central hair and Bian Si, shortcoming is that the cross section of central hair and Bian Si all is circular, hole between them is big, the diameter of steel strand is big, cause the concrete pore passage diameter big, anchoring effect is poor, influences the safety and the application life of prestressed concrete.

Summary of the invention:

When technical problem to be solved by this invention provided a kind of, intensity level long-pending in same cross-sectional and Fracture Force, the steel strand diameter was less, helps improving the safety of prestressed concrete and the high strength low relaxed prestress die drawing steel strand in application life.

Above-mentioned purpose is achieved in that it is made up of a central hair and six limit silks, and the cross sectional shape of the central hair here is similar to hexagon, is centered around the equal approximate trapezoid of limit silk cross sectional shape around the central hair.

Advantage of the present invention is: because the approximate hexagon of the cross sectional shape of central hair, be centered around the central hair equal approximate trapezoid of limit silk cross sectional shape on every side, so the hole between them is little, when, intensity level long-pending and Fracture Force in same cross-sectional, the steel strand diameter is less, can reduce the concrete pore passage diameter, in the duct of same diameter, the quantity of steel strand is increased, simultaneously it increases with the contact area of ground tackle, is easy to anchoring, reduces the quarter wound of ground tackle to steel strand, improve the safety of member, the safety and the application life that help improving prestressed concrete.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a cross sectional representation of the present invention.

The specific embodiment:

With reference to Fig. 1,2, to form by a central hair 1 and six limit silks 2, the cross sectional shape of the central hair 1 here is similar to hexagon, is centered around the central hair equal approximate trapezoid of limit silk 2 cross sectional shapes on every side.

Its production method is: adopt the high-quality high-carbon steel wire rod to draw high-tensile steel wires, then with the limit silk of six roots of sensation steel wire as steel strand, a steel wire is as central hair, the diameter of central hair is more than 1.025 times of limit filament diameter, the lay pitch in accordance with regulations (be diameter 14-16 times) is carried out twisting, pass through mould then, anchor clamps and traction method carry out online drawing, the compression ratio of drawing is about 18%, carry out eddy-current heating then, stretch-draw, the stabilization processes of cooling obtains Φ 20mm1860MPA level 1X7 high strength low relaxed prestress die drawing steel strand sectional area and reaches 285mm ², Fracture Force reaches 530KN, reaches the Fracture Force of Φ 21.6mm1860 level plain bar twisted wire.

Claims (1)

1, high strength low relaxed prestress die drawing steel strand, form by a central hair (1) and six limit silks (2), it is characterized in that: the cross sectional shape of described central hair (1) is similar to hexagon, is centered around the central hair equal approximate trapezoid of limit silk (2) cross sectional shape on every side.

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