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Wedge-shaped prestressed tendon low-retraction anchoring device s and using method

A technology of prestressed tendons and anchoring devices, applied to structural elements, building components, buildings, etc., can solve the problems of large shrinkage of flat anchors, and achieve the effect of simple structure, not easy to deform, and simple operation

Pending Publication Date: 2020-05-08
CHINA RAILWAY DESIGN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a wedge-shaped low-retraction anchoring device for prestressed tendons, especially solving the problem of large retraction of flat anchors after tensioning

Method used

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  • Wedge-shaped prestressed tendon low-retraction anchoring device s and using method
  • Wedge-shaped prestressed tendon low-retraction anchoring device s and using method
  • Wedge-shaped prestressed tendon low-retraction anchoring device s and using method

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Experimental program
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Effect test

Embodiment Construction

[0015] 1 is the prestressing tendon, 2 is the clip, 3 is the low retraction anchor plate, 4 is the wedge backing plate, 5 is the anchor backing plate, 6 is the spiral rib, and 7 is the bellows.

[0016] Such as figure 1 , 2 As shown, the invention discloses a low-retraction anchoring device for wedge-shaped prestressed tendons. The invention is convenient for secondary tensioning, and solves the problems of inconvenient tensioning operation, large retraction, and Unable to achieve low retraction tension and other shortcomings.

[0017] The low-retraction anchoring device for wedge-shaped prestressed tendons of the present invention includes a low-retraction anchor plate 3, a wedge-shaped backing plate 4, an anchor backing plate 5, a clip 2, and a spiral rib 6. The low-retraction anchor plate 3 and the anchor The wedge-shaped backing plates 4 are installed between the backing plates 5 .

[0018] The prestressed tendon 1 passes through the anchor backing plate 5 , the spiral ...

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Abstract

The invention provides a wedge-shaped prestressed tendon low-retraction anchoring device and a using method. The wedge-shaped prestressed tendon low-retraction anchoring device comprises a low-retraction anchor plate, a clamping piece, a wedge-shaped base plate, an anchor base plate and a spiral rib, wherein the wedge-shaped base plate is installed between the low-retraction anchor plate and the anchor base plate. The wedge-shaped prestressed tendon low-retraction anchoring device has the beneficial effect that the problem that a flat anchorage device cannot realize low retraction and tensionis particularly solved. The structure is simple and reasonable; various strength requirements can be met, not only can the high-strength requirement of bridge design be met, but also the retraction amount of the anchorage device can be effectively controlled within 1 mm by pushing the wedge-shaped base plate (compensation gap) during secondary tensioning through the matched use of the inclined surface of the wedge-shaped base plate mounted between the low-retraction anchor plate and the anchor base plate; and the operation is simple and convenient.

Description

technical field [0001] The invention relates to a prestressed anchor for bridge construction, in particular to a wedge-shaped low-retraction anchoring device for prestressed tendons and a use method. Background technique [0002] Low-retraction anchorages are especially suitable for girder bridges and cable-stayed bridges with medium and short prestressed steel tendons. The existing low-retraction anchorages are all circular anchorages, and two tensioning construction techniques are used: the first time according to the conventional The steel strand is stretched by the prestressing tensioning process, so that the clips in the anchor plate clamp the prestressed tendon. At this time, the retraction of the steel strand is generally 4-6mm; the second tension reaches the steel strand. After designing the tension force, tighten the nuts outside the anchor plate to fix it, so as to reduce the retraction loss of the prestressed tension. Ideally, the retraction of the steel strand ca...

Claims

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Application Information

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IPC IPC(8): E01D19/00E04C5/12E01D101/28
CPCE01D19/00E01D2101/28E04C5/122
Inventor 支燕武姚永湖刘涛黄弘生辛建忠侯春辉罗盛敏宋顺心田山坡张广颂孙爱斌
Owner CHINA RAILWAY DESIGN GRP CO LTD
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