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Method for testing and monitoring cable force of PC steel strand stay cable

A testing method and technology for steel strands, applied in tension measurement, erection/assembly of bridges, bridges, etc., can solve problems such as difficulty in monitoring and controlling the cable force of stay cables, and achieve the effect of strong pertinence, economical rationality, and easy construction

Active Publication Date: 2010-05-19
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem that the existing test method is difficult to monitor and control the cable force of the PC steel strand cable-stayed bridge during the construction process

Method used

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  • Method for testing and monitoring cable force of PC steel strand stay cable
  • Method for testing and monitoring cable force of PC steel strand stay cable
  • Method for testing and monitoring cable force of PC steel strand stay cable

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Embodiment Construction

[0047] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in detail, and this embodiment is a multi-span continuous box girder low tower cable-stayed bridge, as figure 1 and figure 2 As shown, the main girder 1 and the cable tower 2 are both reinforced concrete structures, and each cable tower 2 is equipped with 6 pairs of PC steel strand stay cables 3, and each pair of stay cables consists of 91 high-strength φ15.24 It consists of low-slack steel strand 4, the two ends of the steel strand stay cable 3 are respectively anchored on the main beam 1 and the main beam of the cable tower 2, and a steering device is arranged at the top of the cable tower 2, and the steel strand 4 The "tightening" process of the bridge is carried out after the bridge is completed, and the equal tension method is used for tensioning, and the tensioning construction is carried out at both ends at the same time.

[0048] The cable force testing m...

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Abstract

The invention discloses a method for testing the cable force of a PC steel strand stay cable, which is used for testing steel strands individually stretched by the equal tension method. The method comprises the following steps of: obtaining the actual effective tension force of each steel strand based on the actual extension amount and the actual anchorage tension force before anchoring the steel strands; obtaining the linear regression equation of the steel strands according to the actual tension sequence number and the actual effective tension force of the steel strands; obtaining the effective tension force representative value of each anchored steel strand; and multiplying the effective tension representative value of the last stretched steel strand by the number of the steel strands to obtain the cable force of the stay cable. The invention also provides a method for monitoring the cable force of a PC steel strand stay cable in the construction process based on the testing method. On the basis of reasonably using the linear regression analytical method, the invention establishes a method for evaluating the stretching state of the PC steel strand stay cable, thereby effectively solving the problem that the cable force state of a stretched PC steel strand stay cable can not be evaluated by only the traditional testing method.

Description

technical field [0001] The invention relates to a cable force tension test method of a cable-stayed cable of a cable-stayed bridge, in particular to a cable force test and monitoring method of a PC steel strand cable. Background technique [0002] Cable-stayed bridges have a greater spanning capacity than girder bridges and are the most important type of long-span bridges. The upper structure of the cable-stayed bridge is mainly composed of three parts: the cable tower, the cable-stayed cable and the main girder. One of the main stress structures generally adopts two forms of high-strength parallel steel wire cables and PC steel strand cables. [0003] High-strength parallel steel wire cables are generally finished cables manufactured by factories. They are installed as a whole at the construction site, and are tensioned and anchored by a large-tonnage group anchor system. The installation and testing are relatively simple, but as the diameter of the cable increases, its T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/04E01D21/00
Inventor 李军堂涂满明毛伟琦张爱花宋小三陈治任刘翠云田继开
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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