A construction method for the steel arch of a large-span inverted triangle CFST arch bridge

Abstract

The invention provides a construction method for a large-span inverted-triangle-type concrete-filled steel tube arch bridge steel arch. The construction method is characterized in that the construction method comprises the steps that S1, segmentation is conducted on an inverted-triangle-structural-form steel arch truss according to the bearing capacity and the heavy-cargo transporting capacity of an old bridge floor; and a temporary support is arranged at each segment of joint crack, and the temporary supports are located on the old bridge floor; S2, tube holders are arranged at the junctions of the temporary supports and an upper chord as well as of the temporary supports and a lower chord correspondingly, after the steel arch truss is basically settled, loading and unloading are conducted on the steel arch truss by adopting a jack to conduct precise adjustment and elevation on the steel arch truss, and the jack is arranged on the temporary supports; S3, the steel arch truss is hoisted; S4, a steel arch tube string is connected; and S5, a cross arm is installed. According to the construction method for the large-span inverted-triangle-type concrete-filled steel tube arch bridge steel arch, a traditional installation method that a floating crane is adopted to conduct integral hoisting is replaced, operation is conducted by rationally utilizing the old bridge floor, green environmental protection is achieved, materials are saved, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a construction method for a steel arch of a large-span inverted triangle concrete-filled steel tube arch bridge. Background technique [0002] In the early years, most inland river bridges were designed as multi-span bridges, with piers set up in the river channel. In recent years, in order to improve the navigation capacity of inland rivers, multi-span bridges with piers in the original river channel have been demolished, and single-span bridges have been newly built at the original bridge location. However, most old bridges are demolished and new bridges are built after the old bridges are completely demolished, so the old bridges cannot play an auxiliary role in the construction of new bridges. In line with the concept of green environmental protection, economical saving, when building new bridges, the old bridge deck is used to assist the construction of new bridge...

AI Technical Summary

Problems solved by technology

[0004] The traditional installation method is to use floating cranes for overall hoisting, but there are many restrictions on the use of floating cranes

The navigation capacity of inland waterways in most cities cannot meet the entry of floating cranes; and it cannot meet the entire section of transportation of arch ribs; when using floating cranes, it takes a long time for the river

The reconstruction of many inland rivers with small navigable capacity cannot meet the hoisting requirements of floating cranes

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