Construction method of self-anchored suspension bridge steel box beam closing

Abstract

The invention discloses a construction method of self-anchored suspension bridge steel box beam closing. The method includes the following steps that steel box beam standard segments are constructed by the incremental launching method; steel anchor beams are tailored-welded to steel anchor beam assembling supports; vertical supporting devices are arranged on the steel anchor beam assembling supports, and vertical restraint of the steel anchor beams is relieved; the lowest temperature of the day is selected, and a final closure is locked by temporary locking devices; connection of high-strength bolts and welds in the closure is completed, and closing of the steel box beam standard segments and the steel anchor beams is completed. By means of the method, the construction cost and the construction difficulty can be lowered, construction procedures are reduced, the construction period is shortened, the method is safe, and temperature stress in the steel box beam closing process is reduced.

Description

technical field [0001] The invention relates to a construction method for closing steel box girders of a self-anchored suspension bridge, which is suitable for the field of bridge construction. Background technique [0002] At present, steel box girders of self-anchored suspension bridges are mostly composed of standard segments and steel anchor beams at both ends for anchoring the main cables. Among them, the standard section of steel box girder is mostly constructed by jacking method. Due to the stress and structural characteristics, the steel anchor beam has a large structural difference with the standard section of the steel box girder, such as beam height and beam width, and cannot be installed together with the standard section by the jacking method. Installation of steel anchor beams. After the standard section of the steel box girder is pushed into place, a closing section is set between the assembled steel anchor beam, and the closing section is accurately match...

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Problems solved by technology

[0003] This scheme is often used in the construction of steel box girders of self-anchored suspension bridges in China, and the technology is mature. However, for large-span steel box girders, the closing opening is greatly affected by temperature deformation, and precise matching and cutting of the closing section is required, resulting in long construction period and difficult construction. The investment in equipment is large, and it is difficult to ensure the assembly alignment of the steel box girder in the closing section

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