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Two arm-brace stretching method of arc bridge tie bar cable

A technology of tensioning and supporting feet, which is applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as prolonging the service life of working anchors, repeated stress on working clips, and tooth blockage, so as to avoid damage and scratches , prolong the service life and ensure the effect of anchoring performance

Inactive Publication Date: 2010-06-09
中铁大桥(郑州)缆索有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a kind of arch bridge tie-rod cable double-leg tensioning method, the working clip of the working anchor is not stressed during the tensioning process, which solves the problem of the steel strand long cable tensioning process in the prior art. The working clip of the working anchor is repeatedly stressed and the teeth are blocked, prolonging the service life of the working anchor

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  • Two arm-brace stretching method of arc bridge tie bar cable
  • Two arm-brace stretching method of arc bridge tie bar cable

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Embodiment Construction

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] As shown in the drawings, in specific implementation, the tools used in the method of the present invention include a front tool anchor 9, a rear working anchor 5, a rear tool anchor limit assembly 6, a working anchor ring 1, a working anchor clip 2, and a working anchor limit. Position component 3, working anchor support foot 4, tool anchor support foot 7 and hydraulic jack 8.

[0019] When performing the tensioning operation, first install the working anchor ring 1, the working anchor clip 2, the working anchor limiting component 3, the working anchor supporting foot 4, the rear tool anchor 5, the rear tool anchor limiting component 6, and the tool anchor supporting foot. 7. Hydraulic jack 8 and front tool anchor 9. Adjust the working anchor limit component 3 and the rear tool anchor limit component 6 to appropriate positions to meet the limit requirements of the...

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Abstract

The invention discloses a two arm-brace stretching method of an arc bridge tie bar cable, comprising the following steps of: sequentially installing a working anchor, a working anchor arm brace, a rear tool anchor, a tool anchor arm brace, a hydraulic jack and a front tool anchor, enabling the working anchor and the rear tool anchor in a loosening state, clamping a prestressing steel strand by using the front tool anchor and stretching an oil cylinder by using the hydraulic jack to feed oil and pushing the front working anchor for stretching the prestressing steel strand; stopping the stretching of the oil cylinder by using the hydraulic jack to feed oil when the hydraulic jack reaches the maximum stroke, clamping the prestressing steel strand by using the rear tool anchor to enable the front tool anchor to be in a loosening state and stretching the oil cylinder by using the hydraulic jack; carrying out next round of stretching operation after stretching the oil cylinder by using the hydraulic jack to return oil in place; and clamping the prestressing steel strand by using the working anchor when the prestressing steel strand reaches the requirement. In the stretching process, a working clamping piece of the working anchor is not forced, thus the invention solves the problems that the work clamping piece of the working anchor is repeatedly forced and teeth are blocked in the stretching process of a long steel strand cable in the prior art and prolongs the service life of the working anchor.

Description

Technical field [0001] The invention relates to the technical field of bridge building construction, in particular to a double-leg tensioning method for arch bridge tie rod cables. Background technique [0002] Conventional steel strand and long cable tensioning process uses a set of tool anchors and a set of working anchors to cooperate with each other to tension the steel strand long cables. For long cables, the jack stroke cannot be achieved because the elongation of the prestressed steel is greater than the jack stroke. Once the tension is in place, it often takes several times of "topping" to complete the tensioning of the prestressed beam. When the "topping" operation is completed, the working clamps of the working anchor are repeatedly anchored, which affects its normal anchoring performance, and As the prestressed steel is scratched, the skin or coating of the steel strand will block the teeth of the working clamp, which further reduces the anchoring performance of the wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
Inventor 高海安左宏献付东孙新喜
Owner 中铁大桥(郑州)缆索有限公司
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