Rapid circulation construction method for upper structure of superposed beam cable-stayed bridge

Abstract

The invention provides a rapid circulation construction method for an upper structure of a superposed beam cable-stayed bridge. The construction method comprises the following steps: firstly, continuously hoisting front four steel beam sections of a main beam cantilever, mounting a bridge deck on each beam section during connection, moving a bridge deck crane forwards to the forefront beam section, pouring wet joints of bridge decks of the other three beam sections at one time, and secondarily tensioning stay cables for a reverse sequence of the three beam sections; and then carrying out threebeam section construction every time according to the method till that all the cantilever beam sections are installed. Compared with an existing section-by-section installation method, by using the method of the invention, a construction progress can be improved; and compared with an existing method that wet joints of all beam sections are poured at the same time and the stay cables are tensionedin sequence, by using the method of the invention, a cracking risk of bridge decks and the wet joints can be avoided, cost is saved, and construction quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and relates to a superstructure construction of a superimposed girder cable-stayed bridge, in particular to a rapid circulation construction method for the superstructure of a superimposed girder cable-stayed bridge. Background technique [0002] The main girder of a composite girder cable-stayed bridge mainly includes a steel girder and a concrete bridge deck laid on the top of the steel girder. The steel girder and the bridge deck are connected by a shear bond to form a stressed whole. The steel girder itself can be used as both the construction skeleton and the permanent load-bearing member. The concrete deck can replace the orthotropic steel deck in the expensive all-steel girder type, so the composite beam is compared with the general steel structure deck system. More economical and faster to build than concrete girders. [0003] The steel girders of the composite girder cable-s...

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Problems solved by technology

[0004] The above method (1) consumes a lot of time and cost because it needs to wait for the wet joint concrete strength to reach the design strength section by section; method (2) is likely to cause cracking of the bridge deck and wet joints on the front steel girder section, and in order to avoid this situation Appeared, it is necessary to "over-stretch first, and then return to the position to relax" on the stay cables, but this will increase the construction cost

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