A self-anchored suspension bridge suspender tensioning process based on a self-balancing system

Abstract

The invention relates to the field of bridge construction, in particular to a self-anchored suspension bridge boom tensioning technology based on a self-equilibrium system. The technology includes: after the full framing cast-in-place of the main tower and the main beam reaches the design strength, building the main cable, installing the tensioning boom to complete the replacement of the structural system, and detach the full framing. The self-anchored suspension bridge boom tensioning technology based on the self-equilibrium system is short in duration of the boom tensioning construction technology, low in construction cost, less in adopted boom lengthening rods, tensioning times and position exchanging times of the jack, accurate in structural stress, better in fitness between the boom tensioning and the main cable displacement double control during tensioning, free of weather influence on the measurement during tensioning, higher in measuring precision, wider in applicable range of the boom tensioning construction technology, and not only applicable to the self-anchored concrete suspension bridge, but also applicable to the steel box beam self-anchored suspension bridge.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a self-anchored suspension bridge suspender tensioning process based on a self-balancing system. Background technique [0002] Self-anchored suspension bridges are more and more popular because of their beautiful structure, strong adaptability to geological conditions and good economy, especially as urban landscape bridges. Compared with the steel box girder, the main girder uses concrete material to save cost, and the concrete material has better durability. During the construction of the concrete self-anchored suspension bridge, the main girder is poured first, and then the suspenders are stretched to complete the system conversion. Due to the complex force of the structure, the tensioning of the suspenders is the most complicated difficulty in the construction process. Improper tensioning methods of the suspenders will cause The concrete of the main girder and main tower wa...

AI Technical Summary

Problems solved by technology

The traditional suspenders are stretched by a three-wheel tensioning method, so that all the suspenders reach 30%, 60%, and 100% of the design tension respectively. The tensioning efficiency is low, and the jack changeover takes a long time, resulting in a long construction period. If you want to speed up the construction progress, you need to consume a lot of manpower and material resources

Because each suspender is not stretched to the unstressed length at one time, each suspender needs to be extended. The number of suspenders is large, and the manufacturing of the extensions will cause a large construction cost, and the extensions cannot be repeated. Multiple uses lead to serious waste

If the side-span suspender is first anchored and stretched to the unstressed length, the force of the side-span suspender is completely obtained through system conversion, which will cause the disadvantage that the real force of the side-span suspender is not clear

During the tensioning process, the method of dual control of the displacement of the main cable and the force of the boom is implemented, but there is a problem that the total station cannot be used in foggy weather and the light is too strong or too weak, and the accuracy of the total station cannot be guaranteed

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