Limited bracket construction method of large-span S-shaped steel box girder

Abstract

The invention discloses a limited bracket construction method of a large-span S-shaped steel box girder. The steel box girder comprises 14 small sections of prefabricated steel box girders; and the 14small sections of prefabricated steel box girders are assembled into seven large sections at a construction site, and then the seven large sections are hoisted and fixed. The construction method comprises the following specific steps of: prefabricating and assembling the steel box girders, constructing temporary brackets in water, hoisting and positioning steel box girder section blocks, connecting steel box girder interfaces, constructing closure sections and welding the collar extension of the steel box girders. According to the limited bracket construction method, a prefabricated assemblymode is used during construction; a floating crane is used for assembly, so that the occupation and pollution of a water area under a bridge are reduced; the parallel operation of multiple processes speeds up the construction progress and shortens the construction period; the temporary brackets are arranged only at circular seams of large-section girder joints; and the brackets occupy small space,thereby facilitating the navigation under the bridge in the construction state and reducing the influence on the navigation under the lake-across construction bridge and surrounding social environments.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, in particular to a method for constructing a large-span S-shaped steel box girder with few supports. Background technique [0002] The colorful beautification work of tourist attractions and tourism in a city has been paid more and more attention by designers and owners. It has become a widely researched topic to make bridges personalized and beautiful, and at the same time to be in harmony with the surrounding environment of tourism. ,Steel box girder is a new type of steel girder structure. It has been widely used in the construction of large-span bridges in recent years due to its advantages of large span, light weight, short construction period, high strength and good rigidity. [0003] For the traditional arch bridge "bracket method" construction method, the brackets often form a stable system by themselves. Before the installation and construction, the support should be constru...

AI Technical Summary

Problems solved by technology

It usually uses a lot of bracket materials, which requires considerable labor and mechanical investment, and it takes a certain period of time to manufacture, install, and weld the brackets. It is inevitable to invest a lot of cost and the construction period is long

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