Construction Method of Long-span Downward Rigid Tied Steel Arch Bridge

Abstract

The invention discloses a construction method of a large-span through type rigid tied bar steel arch bridge. The steel arch bridge comprises a bridge superstructure, a bridge substructure and a bridgebearing. The construction method comprises the following steps that construction of the bridge substructure is conducted; sectional prefabrication of the bridge superstructure is conducted; integralassembling of the bridge superstructure is conducted; the bridge superstructure is overall hoisted through a floating crane; tugboats abreast tow the floating crane to sail in a main channel; the floating crane is subjected to load movement in a narrow river channel; and the bridge superstructure is overall mounted through position adjusting. According to the construction method, segmented-transporting of the bridge superstructure to a bridge site for overall assembling is not required, overall assembling of the overall assembling is completed in an overall assembling site of a wharf, and thenone floating crane is adopted to overall hoist the bridge superstructure to the bridge site for overall hoisting; and the scheme does not require building of a temporary support, the requirement of conditions of a construction site is low, impact on the surrounding environment is low, and the construction period is short.

Description

technical field [0001] The invention relates to a construction method of a large-span downward-supported rigid tie-rod steel arch bridge, which belongs to the technical field of bridge construction. Background technique [0002] The construction of arch bridges can adopt different construction methods according to different construction conditions, mainly including support construction method, cable hoisting method, swivel construction method, cantilever assembly method, and overall lifting method of large arch ribs. [0003] The support construction method is to assemble the frame at the bridge position according to the design line shape and pre-camber value of the arch rib, and then assemble it in place on the frame. The frame can be full or split, or a combination of the two. The construction method with supports is usually adopted when the arch rib is not high from the ground, there is no water or the water level is not deep under the bridge, and the construction condit...

AI Technical Summary

Problems solved by technology

Its shortcomings are: there are many arch rib joints, the welding workload is large, and the construction period is long; the requirements for the terrain and foundation under the bridge are relatively high

Engineering practice shows that the above-mentioned installation method has complex procedures, requires the erection of temporary auxiliary facilities, and has a long construction period, which has a great impact on the waterway

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