Construction method for steel structure arch rib of arch-type bridge

Abstract

The invention relates to a steel structure arch rib construction method of an arch-type bridge, which comprises connecting steel structure arch rib segments of the bridge into two vertical semi-arch ribs, vertically rotating downwards the two semi-arch ribs to the position where the arch rib on the back of the bridge is located, and folding the two semi-arch ribs. The scheme is convenient for arch rib construction and guarantees the construction precision through connected the arch ribs on the vertical direction on one hand, on the other hand, the two vertical semi-arch ribs are connected, which can fully utilize the landform of steep hill-slope, and can finish the construction of the arch rib on a small field, avoids the problem that high construction cost which is caused by working in the large field requirement such as blasting which is required by the flat rotation, and saves time, largely reduces construction cycles, and further reduces construction cost.

Description

technical field [0001] The invention relates to bridge technology, in particular to a steel structure arch rib construction method of an arch bridge. Background technique [0002] In bridge construction, a long-span arch bridge whose main part is a steel structure arch rib is especially suitable for construction in places with steep hillsides on both banks due to its structural stress characteristics. Rib construction is a technical problem that needs to be solved first. [0003] At present, under this environment, the main construction methods of steel structure arch ribs of arch bridges include segmental cable hoisting construction and horizontal rotation method construction. [0004] Among them, the segmental cable hoisting construction method is as follows: use the cable cranes on the mountains on both sides of the bank, use the cable cranes to hoist each arch rib segment according to the position after the bridge is completed, and connect it to the previous segment of ...

AI Technical Summary

Problems solved by technology

[0007] The segmental cable hoisting construction method is to assemble the steel structure arch rib segments in the state of a large cantilever in the air, which makes the construction difficult, the cycle is long, and the construction accuracy is difficult to guarantee; and the horizontal rotation method construction method In order to erect the arch rib assembly bracket, it is necessary A large number of blasting operations are carried out on the hillsides on both sides, and in order to balance the weight of the arch ribs, special counterweights are required behind the swivel system. Due to the need for swivels, not only a large site is required, but also a large amount of blasting or development is required. Excavation operations increase construction costs

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