A simultaneous cable-girder construction method for a cable-stayed bridge with sparse cables

Abstract

The invention discloses a synchronous construction method for a sparse-cable-stayed bridge cable beam, and relates to the field of cable-stayed bridge construction. A sparse-cable-stayed bridge to be constructed comprises a main tower, a main beam body and a plurality of stayed cables. The method comprises the following steps: firstly, constructing cabled segments, moving hanging baskets forward after construction of the cabled segments, and tensioning a part of steel strands in the stayed cables of the cabled segments; secondly, constructing cableless segments, tensioning the remaining part of the steel strands in the stayed cables of the cabled segments after completing construction of the cableless segments, and then moving the hanging baskets; thirdly, circulating the construction steps till completing construction of the main beam body. The method can save the construction period, and the steel strands cannot be damaged easily.

Description

technical field [0001] The invention relates to the construction field of cable-stayed bridges, in particular to a cable-girder synchronous construction method for cable-stayed bridges with sparse cables. Background technique [0002] The cable-stayed bridge with sparse cable system is generally designed as a single cable plane, and parallel steel strand cable-stayed cables are used. The main girder is composed of segmental prestressed concrete box. , a single cable-stayed cable contains multiple steel strands and its volume is very large. If the whole cable is used for tensioning, it is necessary to develop a large-tonnage tensioning jack to tension the cable-stayed cable. The main girder of this type of cable-stayed bridge The conventional construction generally adopts the ordinary hanging basket method cantilever pouring construction method, and the construction process is "construction with cable segments → cable-stayed cable threading and tensioning for cable segments →...

AI Technical Summary

Problems solved by technology

[0006] In the method (1), the steel strands are stretched one by one, because the steel strands in a single stay cable are large in size, so the steel strands are stretched one by one, which will inevitably occupy too much construction period of the main girder. , and when tensioning one strand at a time, the stress of the main girder changes too much; the steel strand tensioning method in method (2) can save the construction period, but requires large-tonnage group anchor tensioning jacks. It is extremely difficult to construct, and the working clips are likely to cause great damage to the steel strand when the tension is carried out in stages at the same time.

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