Detachment construction method and fixture for temporary support system for precast-small-box-girder hidden capping beam of road bridge

Abstract

The invention discloses a detachment construction method and fixture for a temporary support system for a precast-small-box-girder hidden capping beam of a road bridge. The detachment construction method comprises the following steps: (1) detaching a cantilever beam; (2) detaching an abutment pier support system, and loading; (3) detaching an outer-side main beam section connected with the abutment pier support system, and loading; (4) detaching a main beam middle-part beam section connected with a main pier support system, translating and dropping the beam; (5) hoisting a main truss system, laterally dropping the main truss system to the ground, and loading; and (6) detaching a main pier vertical support system and a bearing beam. Therefore, according to the detachment construction methodand fixture, the possibility of rapid detachment for the large temporary support system (the temporary support system for the precast-small-box-girder hidden capping beam of the road bridge) in the projection range of precast small box girders after the precast small box girders are erected, is achieved, and the requirements of traditional large automobile cranes, crawler cranes and other equipment on an operation space are avoided.

Description

technical field [0001] The invention relates to a dismantling construction method, in particular to a dismantling construction method for dismantling a temporary support system of a prefabricated small box girder type hidden cover beam of a road and bridge. [0002] The present invention also relates to a demolition tooling suitable for the above-mentioned demolition and demolition construction method. Background technique [0003] Generally, the estimated cost of using cast-in-place box girders for the main bridge of the same area is greater than that of using prefabricated small box girders. Therefore, in terms of cost savings, choosing prefabricated small box girders for bridge deck construction can greatly reduce construction costs. At the same time, this construction method can also shorten the construction period. [0004] When the bridge deck of the road bridge is constructed with prefabricated small box girders, several prefabricated small box girders parallel to ea...

AI Technical Summary

Problems solved by technology

Since the supporting system is designed for the road and bridge construction where the main bridge is a PC hollow slab girder (span 20m, girder height 90cm, single girder weight 22.2 tons), the main bridge is a prefabricated small box girder (90 tons / piece , which is more than three times that of the PC hollow slab girder), such a support system is not applicable due to the limitation of the bearing capacity; in addition, more importantly, the support system is limited to the scope of the bearing platform, and In the truss system adopted, in order to reduce the length ratio of the main support column, dense rods are set in the support area, so vehicles (used to carry the components of the support system or prefabricated small box girders) cannot pass through during construction, thus increasing the The removal of the support system and the inability to improve the efficiency of bridge deck construction by increasing the transport capacity

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