Construction method for erecting steel tube stiff bridge framework through asymmetric lifting

Abstract

The invention discloses a construction method for erecting a steel tube stiff bridge framework through asymmetric lifting. The construction method comprises the following steps that a lifting platform is erected on a slope of a valley on the east coast, a load-bearing cable is tensioned, a lifting tackle is arranged on the load-bearing cable, and a pulling cable and a lifting cable are arranged on the lifting tackle; cantilever segments are prefabricated; side spans of the bridge framework of the east coast and the west coast are erected symmetrically, when the side span of the bridge framework of the east coast is erected to the cantilever segment over the lifting platform, erecting of the side span of the bridge framework of the east coast is paused, the side span of the bridge framework of the west coast continues to be erected to the midspan, and the side span of the east coast and the side span of the west coast are about to be combined; and the rest of the cantilever segments of the side span of the bridge framework of the east coast are placed to the corresponding lifting positions, installed through the lifting tackle, and erected sequentially till the side span of the east coast and the side span of the west coast are combined. According to the construction method, by the adoption of the cantilever segment erecting method by combining symmetry with asymmetry, the construction period is shortened, the cost for erecting a horizontal platform and channels is reduced, and the problem that an overwater platform is difficult to erect is solved.

Description

technical field [0001] The invention is used in the technical field of bridge construction, and in particular relates to a construction method for erecting a steel pipe rigid bridge skeleton by adopting asymmetric hoisting. Background technique [0002] China has a long history of arch bridge construction. In ancient times, stone arch bridges were the main bridge type. Today, after the rapid development of industry, arch bridges using different materials and systems have also developed rapidly. In long-span arch bridges, when the steel tube stiff skeleton in reinforced concrete arch bridges is erected by cable crane air transportation, cable-stayed buckle-hanging cantilever assembly method, the hoisting method is generally a symmetrical erection method, which is both small-mileage and long-mileage. The rigid frame is erected segment by segment. After all the cantilever rigid frame segments are installed, the closing section is waiting for installation. The erection sequence...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a construction method for erecting steel pipe rigidity bridge skeleton by asymmetric hoisting, which saves time in the construction period, economically saves the cost of erecting horizontal platforms and passages, and solves the problem of construction difficulty. Solved the difficult problem of setting up the water platform

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