Construction method for pushing and furling complete bracket of steel box girders

Abstract

The invention relates to a construction method for pushing and furling a complete bracket of steel box girders, which comprises the following steps: (1) erecting a side span complete bracket; (2) lifting and welding each side span steel box girder to form a whole; (3) lifting a main span steel box girder and a furling section; (4) modifying and cutting the girder length of the furling section; and (5) pushing and furling the whole of the side span steel box girders. The invention has simple bracket form and quick construction, enhances the construction quality and can also shorten the construction period.

Description

technical field [0001] The invention relates to a bridge closure technology, in particular to a construction method applied to the closure of side-span steel box girders and main-span steel box girders of cable-stayed bridges. Background technique [0002] The difficulties in the installation of steel box girders of cable-stayed bridges are mainly the installation and closing construction under unfavorable geological conditions, especially the structural internal force, elevation, and beam length of steel box girders under the influence of temperature differences are constantly changing, which adds more unfavorable conditions to the construction . There are generally two closing construction methods for conventional steel box girders, natural closing method and forced closing method. The natural closing method is to adjust the side span to the design position before hoisting the closing section and weld it as a whole, hoist the closing section at the closing temperature, an...

AI Technical Summary

Problems solved by technology

The steel box girder of the forced closing method takes a long time to precisely position a single beam section and complete the welding of the girth seam, which affects the construction progress; the hoisting space of the closing section of the natural closing method is small, and the closing section is prone to violent collisions, which not only affects the construction quality, but also affects the construction schedule

Moreover, neither the natural method nor the forced method can overcome the huge impact of atmospheric temperature changes on the closure of steel box girders.

For bridges with simultaneous construction of towers, girders, and stay cables, the pressure on the construction period is huge. If a reasonable construction method is not adopted, the construction period will be delayed.

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