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Tensioning method for vertical prestressed steel strand of concrete continuous beam

A prestressed steel strand, vertical prestressing technology, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc. The effect of avoiding broken wires, ensuring quality and increasing construction costs

Pending Publication Date: 2022-07-08
ROAD & BRIDGE INT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the anchor of the tool will produce bite marks on the steel strand during the first tension, and the position of the bite mark is relatively low. Broken wires occur, the proper tension cannot be achieved, and the quality of the secondary tension cannot be guaranteed. However, this problem has not been paid attention to in construction at present

Method used

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  • Tensioning method for vertical prestressed steel strand of concrete continuous beam
  • Tensioning method for vertical prestressed steel strand of concrete continuous beam

Examples

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specific Embodiment approach

[0014] like figure 1 As shown, during the primary tensioning, a steel sleeve 4 is set on the prestressed steel strand 3 between the tensioning jack 1 and the tool anchor 2, and the length of the steel sleeve is greater than the height of the secondary tensioning bracket. The depth of the anchoring groove is to improve the bite mark position of the tool anchor on the steel strand; the tension jack 1 pushes the steel sleeve 4 upward, and the prestressed steel strand 3 is stretched to the design length. The clip 6 is knocked into the hole, and the prestressed steel strand 3 is anchored to complete one tension;

[0015] like figure 2 As shown, during the secondary tensioning, the steel sleeve is removed, and a tensioning bracket 7 is set under the tensioning jack 1. The bottom of the tensioning jack 1 is supported on the tensioning bracket 7, and the top is directly in contact with the tool anchor 2, and Ensure that the bite mark on the steel strand 3 is located above the tool ...

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Abstract

The invention relates to a method for tensioning a vertical prestressed steel strand of a concrete continuous beam, which comprises the following steps of: during primary tensioning, sleeving a steel sleeve on the prestressed steel strand between a tensioning jack and a tool anchor so as to improve the biting mark position of the tool anchor on the steel strand; and during secondary tensioning, the steel sleeve is taken down, a tensioning support is arranged below the tensioning jack, it is guaranteed that a bite mark generated on the steel strand during primary tensioning is located above the tool anchor, the tensioning jack pushes the tool anchor upwards, and secondary tensioning is completed. According to the secondary tensioning device, the phenomenon that the steel strand is broken during secondary tensioning can be avoided, and the secondary tensioning quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, relates to the construction of large-span concrete continuous beams, and in particular relates to a method for tensioning vertical prestressed steel strands of concrete continuous beams. Background technique [0002] In order to reduce the occurrence of diseases, long-span concrete continuous beams are often set with vertical prestressing. Because the vertical prestressing steel strands are generally short, the primary tension deformation is small, and the prestress loss during the construction process is difficult to control. The secondary tension is used to make up for the loss of prestress in the primary tension. [0003] Since the steel strand has been anchored with the working anchor after the primary tensioning, the secondary tensioning is generally carried out in the form of a tie rod combined with an anchor cup. Connect the tie rod to lift the working anchor up to a certain h...

Claims

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Application Information

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IPC IPC(8): E01D21/00E04G21/12
CPCE01D21/00E04G21/12E04G21/121
Inventor 陈强汪泉庆张奎易桂林伍航向
Owner ROAD & BRIDGE INT
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