Construction method for high-pier large-span bridge steel mixing beam in mountainous area

Abstract

The invention relates to a construction method of a high-pier large-span bridge steel mixing beam in a mountainous area. The construction method comprises the following steps that a steel mixing composite beam is prefabricated in a rear field, the prefabricated structure is optimized, a steel box girder and a concrete bridge panel are ensure to be subjected to force to resist the large cross-pathbeam body down-warping; detachable telescopic joints are additionally arranged on a front supporting leg and a rear supporting leg of a bridge erecting machine, and the bridge erecting machine can adapt to the erection of the bridge with slope below 4%; when the bridge erecting machine passes through holes, a girder transporting vehicle is connected through a crown block as the counterweight, so that a cantilever of the bridge erecting machine can be shortened, and the weight of the whole machine is reduced; and transverse moving wheel sets are arranged below a support in the bridge erecting machine, so that beam sheets can be transversely moved through a full-width machine, and accurate positioning and butt joint of the same-hole multi-piece beams can be realized. According to the construction method, the erection efficiency of the steel mixing combined beam can be effectively improved, the positioning precision and the assembling quality of the steel mixing combined beam are guaranteed, and the steel mixing combined beam is promoted to be applied in the mountainous area high pier large-span bridge.

Description

technical field [0001] The invention belongs to the technical field of highway bridge construction, relates to a construction method of a steel-concrete composite beam for a bridge, and is applied to the construction field of the superstructure of a bridge steel-concrete composite beam in highway engineering. Background technique [0002] Steel-concrete composite beams have large spans and strong bearing capacity, and are often used in flyover bridges, ramp bridges and municipal roads. During the construction of steel-concrete composite beams, the construction method of first hoisting the steel girders and then the overall cast-in-place concrete bridge deck is adopted. The steel beam hoisting process is divided into whole-hole hoisting and segmental hoisting. Segmental hoisting equipment generally uses gantry hoisting. Machine, high construction safety risk, low efficiency, the hoisting of the whole hole needs to set up temporary buttresses, set up floor brackets, cooperate ...

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Problems solved by technology

[0006] Due to the large span, in order to ensure the balance of the bridge erecting machine when passing through the hole, it is necessary to lengthen the cantilever of the bridge erecting machine, resulting in excessive weight and volume of the bridge erecting machine, which affects construction safety;

[0007] If the steel-concrete composite beam adopts a three-box structure, and the boxes are bolted through crossbeams, the single span can be divided into three pieces for hoisting separately, but the bolting between beams has extremely high requirements on the installation and positioning accuracy of the steel-concrete beam and the elevation accuracy of temporary supports , if there is a deviation, it is difficult to handle at high altitude, and it is difficult to guarantee the construction quality and progress of the project

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