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Parallel steel stranded wire stay cable tensioning control method

A technology of parallel steel strands and control methods, which is applied in the direction of erecting/assembling bridges, bridges, buildings, etc., and can solve problems such as errors and immediate effects that are not considered

Active Publication Date: 2014-02-05
CCCC SECOND HARBOR ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method does not take into account the influence of the instant effect during the tension process, such as the change of temporary construction load on site, the influence of structure temperature and wind load, etc.
Therefore, after the tensioning is completed, the overall tension may have an error with the target value, so overall adjustment is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] 1) Establish a finite element model of the full bridge through three-dimensional finite element software, and adjust the cables through the method of forward assembly to disassembly iteration and determine the reasonable bridge state, and then analyze the construction phase to find the i-th cable stay in the ideal state The cable tension force F and the unstressed length L of the i-th stay cable, where the i-th stay cable is composed of n-stranded wires;

[0022] 2) Preliminarily determine the number k of steel strands required to bear the weight of the cable casing, and draw up a tension with an overtension coefficient greater than 1 (for example, the overtension coefficient is selected as 1.4-1.6) as the tension force of the steel strand supporting the cable casing ;

[0023] 3) Pull the steel strands supporting the cable casing and install a dynamometer on the first steel strand to ensure that the tension of all k strands is consistent;

[0024] 4) Add the instantaneous t...

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PUM

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Abstract

The invention discloses a parallel steel stranded wire stay cable tensioning control method. The method includes that temporary load, structure temperature and wind load on an instant bridge deck are added in a finite element model of a full bridge to determine tensioning force of a steel stranded wire supporting a cable sleeve, a cable unit corresponding to a single steel stranded wire is added in the finite element model of the full bridge to determine tensioning force of a standard steel stranded wire, serving as reference to tension the steel stranded wire, in a ith stay cable. In actual construction, steel stranded wire tensioning construction is performed by taking the tensioning force of the standard steel stranded wire as a target value to achieve the objectives of tensioning in-place by one time of a parallel steel stranded wire stay cable and high-precision coincidence of the tensioning force of the stay cable after actual tensioning is completed and the target value.

Description

Technical field [0001] The invention relates to the field of bridge construction and construction, in particular to a method for controlling the tension of parallel steel stranded cables. Background technique [0002] Stay cables are the main load-bearing structure of cable-stayed bridges. There are two main types of stay cables in modern cable-stayed bridges, one is parallel steel wire cables and the other is parallel steel strand stay cables. Among them, the parallel steel strand cable is usually composed of multiple steel strands, which are externally sealed with a cable sleeve, and grease and other anti-corrosion materials are filled between the cable sleeve and the steel strand. Different from the overall tensioning of parallel steel cables using large-tonnage jacks, the tensioning of parallel steel strands and oblique cables is carried out in a method of breaking up into parts. A single steel strand is used as the tensioning unit, and a handheld small jack is used for tensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
Inventor 张永涛游新鹏彭成明罗锦刚范波刘小勇李鑫杜松许磊磊
Owner CCCC SECOND HARBOR ENG
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