A Cable Tensioning Device for Eliminating Backtwist

A technology of tensioning device and stay cable, which is used in cable-stayed bridges, erecting/assembling bridges, bridge parts, etc. The effect of wire cutting and ensuring construction safety

Active Publication Date: 2016-08-24
中铁大桥(郑州)缆索有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cable tensioning method and equipment for eliminating back-twisting, which solves the problems caused by the back-twisting of the cable body during the traction and tensioning process of the large-scale super-long cable-stayed steel strands in the prior art. The steel strands are twisted, thus avoiding the occurrence of steel strand breakage accidents and ensuring the safety of cable-stayed bridges

Method used

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  • A Cable Tensioning Device for Eliminating Backtwist

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the drawings.

[0011] Such as figure 1 As shown, a stay cable tensioning device that eliminates back-twisting includes stay cable anchor cup 1, connector 2, nut 3, traction steel strand 4, tension support foot 5, and thrust roller bearing 6 , The first tool anchor 7, the first tool anchor limiting component 8, the tool anchor supporting foot 9, the hydraulic jack 10, the second tool anchor 11 and the second tool anchor limiting component 12.

[0012] The following is an embodiment of the present invention:

[0013] Lift the stay cable to the beam surface, connect the traction steel strand 4 to the stay cable anchor cup 1 through the connector 2. The traction steel strand 4 is made of seven steel wires with a nominal diameter of 15.2mm. The number of wires, the number of traction steel strands 4 and the size and technical conditions of the connector 2 need to be designed by technicians according to spe...

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PUM

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Abstract

The invention discloses a stay cable tension device for eliminating back-twist. The device comprises a stay cable anchor cup, a connector, a nut, a traction steel strand, a tension supporting lug, a thrust roller bearing, a first tool anchor, a first tool anchor limiting component, a tool anchor supporting lug, a hydraulic jack, a second tool anchor and a second tool anchor limiting component, wherein the stay cable anchor cup is connected with the traction steel strand through the connector, the stay cable anchor cup is connected with the tension supporting lug through the nut, the thrust roller bearing is arranged behind the tension supporting lug, the first tool anchor is arranged on the thrust roller bearing, the first tool anchor is connected with the tool anchor supporting lug, the tool anchor supporting lug is connected with the hydraulic jack, and the hydraulic jack is connected with the second tool anchor. According to the invention, the problem of twisting of steel strands caused by back-twist of a large-size ultra-long stay cable in traction and tension processes of the steel strands is solved; and the thrust roller bearing structure is creatively adopted, and the thrust roller bearing is arranged on the tension supporting lug.

Description

Technical field [0001] The invention belongs to the technical field of bridge building construction, and in particular relates to a cable tensioning device for eliminating back-twisting. Background technique [0002] For long-span cable-stayed bridges, with large cable specifications and long cable strands, several parallel steel strands need to be used. Two sets of tool anchors are used alternately to pull the cable to the designed position. As the stay cable wire is twisted by 3° left-handed and subjected to axial pulling force, the cable body will rotate to the right-handed direction along the axis, resulting in back twist. When the stay cable is installed, the twisting of the cable body will cause the parallel traction steel strands to twist, and then twist, which changes the stress state of the steel strands. The steel strands at the anchor joints will be twisted. A certain amount of shearing force is generated by twisting. With the further increase of the torsion angle of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D19/16E01D11/04
Inventor 高海安孙新喜石艺歌付东张召
Owner 中铁大桥(郑州)缆索有限公司
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