Construction method for dismantling temporary support system of prefabricated small box girder type concealed cover beam of road and bridge

Abstract

The invention discloses a construction method for dismantling a temporary support system of a prefabricated small box girder type concealed cover girder of a road bridge. The demolition construction method includes the following steps: (1) removal of the cantilever beam; (2) removal and loading of the side pier support system; (3) removal and loading of the outer main beam section connected with the side pier support system; (4) Dismantling, translation, and falling of the beam section in the middle of the main beam connected to the supporting system of the main pier; (5) Lifting of the main truss system, landing on the side, and loading; (6) Dismantling of the vertical supporting system and pads of the main pier beam. It can be seen from this that the present invention can make the large-scale temporary support system (temporary support system of prefabricated small box girder type concealed cover girder of road and bridge) within the projection range of the prefabricated small box girder possess the possibility of quick dismantling after the erection of the prefabricated small box girder is completed, avoiding the Traditional large truck cranes, crawler cranes and other equipment require operating space.

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 concealed cover girder of a road bridge. [0002] The present invention also relates to a dismantling tool suitable for the above dismantling and dismantling construction method. Background technique [0003] Generally, the estimated cost of using cast-in-place box girders for main bridges of the same area is greater than the estimated cost of using prefabricated small box girders. Therefore, in terms of cost savings, choosing prefabricated small box girders for road and 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, a number of parallel prefabricated small b...

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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