Steel truss arch bridge arch rib and main beam mounting method

Abstract

The invention provides a steel truss arch bridge arch rib and main beam mounting method, relates to the technical field of bridge construction, and aims to realize mounting of an arch rib and a main beam at the same time and save the construction period and construction equipment. The method comprises the following steps that firstly, two side spans of the steel truss arch bridge are constructed, and the two side spans are symmetrically constructed; secondly, an arch climbing crane is installed on each side span; thirdly, the two sets of arch climbing cranes gradually hoist the steel arch rod pieces from the side spans to the middle spans of the two sets of arch climbing cranes, and installation is completed till the steel arch rod pieces are folded; and fourthly, the two sets of arch climbing cranes symmetrically construct suspenders and main beams from the middle span to the side spans. According to the method of the invention, the arch rib and the main beam can be simultaneously mounted by adopting the arch climbing crane, so that one machine has two purposes, construction equipment is saved, and the construction period is shortened.

Description

technical field [0001] The present disclosure relates to the field of bridge construction, in particular to a steel truss arch bridge arch rib and a main girder installation method. Background technique [0002] Long-span steel arch bridges generally adopt the construction method of arch first and girder later. The steel arch can be installed by cantilever method, and cable crane or climbing arch crane is usually used for cantilever erection. [0003] The erection of steel arches using arch climbing cranes is generally divided into the following steps: ① Carry out side span construction and install arch climbing cranes. ②The steel arch is assembled with the cantilever of the arch-climbing crane, the buckle tower is installed after the arch-climbing crane passes the side span, and the anchor cable is installed and tensioned when the cantilever is assembled to the corresponding position to ensure the force and stability of the cantilever construction. The boom construction is...

AI Technical Summary

Problems solved by technology

[0004] This construction method of arch-climbing crane has the following disadvantages: ①The arch-climbing crane only installs the steel arch. The main beam is installed in the middle of the span, and the construction period is longer

②The installation of the entire bridge requires two large-scale equipment, the climbing arch crane and the bridge deck crane, and the construction cost is very high

③ There is a long time lag between the installation of the boom on the arch-climbing crane and the connection between the main girder and the boom. At this stage, the boom is in a free state at the lower end and is difficult to fix. It is greatly affected by wind load and affects the structure during construction. Overall stability, increased security risk

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