CN201933694U - Spiral rib prestressed steel strand - Google Patents

Abstract

The utility model provides a spiral rib prestressed steel strand, which is formed by twisting a spiral rib steel wire, wherein the surface of the spiral rib steel wire is provided with four parallel and spirally-wound spiral ribs; the cross section of each spiral rib is a trapezoidal cross section; the nominal diameter of the spiral rib steel wire is between 4 millimeters and 10 millimeters; the width of the spiral rib steel wire is between 0.9 millimeter and 3.0 millimeters; and the lead of each spiral rib is between 24 millimeters and 58 millimeters. The utility model has the advantages that: the spiral rib prestressed steel strand has high intensity, high mechanical property and wide application range, the bond stress between the spiral rib prestressed steel strand and concrete is enhanced, and the problems of slippage and contraction of a core wire and a middle wire are solved.

Description

A kind of spiral ribs prestress wire

Technical field

The utility model relates to a kind of building trade and uses the prestressing steel field, particularly relates to a kind of spiral ribs prestress wire.

Background technology

Prestressed concrete member in the building trade in order to increase mechanical properties such as member resistance to compression, antidetonation, mostly uses compressor wire or steel strand to make arrangement of reinforcement.The quality of the bond stress between its arrangement of reinforcement and the concrete is the key factor of decision prestressed concrete member quality.

The prestressed concrete member of present technology adopts round wire or has the steel strand that symmetrical indented wire is done or formed by the above steel wire system of twisting is prestressed concrete member adapted master muscle, there are the following problems: 1, the round wire surface is smooth, bond stress is less, 2, the steel strand that have the round wire system of twisting to form, only depend on the back pressure stress of the frictional force generation of the non-effective contact between the round wire to the coagulation upper member, very easily produce core silk limit portion slippage retraction, cause the minimizing of core silk stress or lose stress fully, restrict the quality and the life-span of prestressed concrete member, and reduced steel strand and concrete bond stress; 3, the steel strand that have symmetrical indented wire or form by the above steel wire system of twisting, and the bond stress between the concrete is less, and especially the former concentrates seriously by stress, causes prestressed concrete member second-rate.

Summary of the invention

The purpose of this utility model provides a kind of enhancing and grip of concrete, and the intensity height solves core silk and intermediate filament slippage retraction problems, and mechanical property is good, the spiral ribs prestress wire of applied range.

The technical solution of the utility model is: a kind of spiral ribs prestress wire, described steel strand are formed by the helix rib steel wire system of twisting, the surface of described helix rib steel wire have 4 parallel shapes in the shape of a spiral around spiral ribs, the section of described spiral ribs is a trapezoidal cross-section.

The nominal diameter of described helix rib steel wire is 4mm-10mm.

The width of described spiral ribs is 0.9mm-30mm, and the spiral ribs helical pitch is 24mm-58mm.

Advantage and the good effect that the utlity model has are: strengthen and grip of concrete, the intensity height solves core silk and intermediate filament slippage retraction problems, and mechanical property is good, applied range.

Description of drawings

Fig. 1 is a cross-sectional view of the present utility model;

Fig. 2 is the structural representation of helix rib steel wire;

Fig. 3 is the sectional structure schematic diagram of A-A among Fig. 2.

Among the figure:

1, steel strand 2, helix rib steel wire 3, spiral ribs

D is the single rib dimension width of spiral ribs

L is the spiral ribs helical pitch

The specific embodiment

As Fig. 1, Fig. 2 and shown in Figure 3, steel strand 1 described in the utility model are formed by helix rib steel wire 2 system of twisting, the surface of described helix rib steel wire 2 have 4 parallel shapes in the shape of a spiral around spiral ribs 3, the section of described spiral ribs is a trapezoidal cross-section.

The nominal diameter of described helix rib steel wire 2 is 4mm-10mm.

The width of described spiral ribs 3 is 0.9mm-3.0mm, and spiral ribs 3 helical pitches are 24mm-58mm.

More than an embodiment of the present utility model is had been described in detail, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limit practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.

Claims (3)

1. spiral ribs prestress wire is characterized in that: described steel strand are formed by the helix rib steel wire system of twisting, the surface of described helix rib steel wire have 4 parallel shapes in the shape of a spiral around spiral ribs, the section of described spiral ribs is a trapezoidal cross-section.

2. a kind of spiral ribs prestress wire according to claim 1 is characterized in that: the nominal diameter of described helix rib steel wire is 4mm-10mm.

3. a kind of spiral ribs prestress wire according to claim 1 is characterized in that: the width of described spiral ribs is 0.9mm-3.0mm, and the spiral ribs helical pitch is 24mm-58mm.

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