Bent cap structure adopting a double-main-beam prefabricating and assembling method and construction method thereof

Abstract

The invention provides a bent cap structure adopting a double-main-beam prefabricating and assembling method. The cross section of the bent cap is composed of a left prefabricated beam, a right prefabricated beam and a middle trapezoidal post-pouring section, notches are reserved in the upper portions of the two prefabricated sections, and the trapezoidal post-pouring section connecting structure is formed after assembly. According to the construction mode of the trapezoidal post-pouring section located at the top of the bent cap, a post-pouring section reinforcement cage is installed in place at a time, and reserved reinforcements and post-pouring section reinforcements do not need to be connected in a welded mode; the prefabricated section also serves as a formwork, and a post-pouring section formwork does not need to be additionally arranged on site; the prefabricated section is directly hoisted and placed on the top of a pier stand column during installation, and temporary supports or fixing measures are not needed. The bent cap structure has the advantages of being small in site construction workload, high in operability, high in construction speed, good in structural integrity and durability and the like. The bent cap structure is suitable for bent caps which are heavy and need to be transported in a segmented mode.

Description

technical field [0001] The invention belongs to the technical field of bridge prefabrication and assembly, and relates to a cover beam structure, in particular to a cover beam structure using a double main beam prefabrication and assembly method. Background technique [0002] Bridge prefabrication and assembly technology has developed rapidly in recent years. Prefabrication and assembly technology includes factory prefabrication, transportation and hoisting of prefabricated components, and on-site connection technology. The transportation and hoisting of prefabricated components is limited by road transportation along the route and on-site hoisting conditions, so the weight of prefabricated components needs to be controlled. [0003] The viaduct cover girder has the characteristics of concentrated force, large size and heavy weight. As a force-transmitting component between the bridge superstructure and substructure, its structural size is related to the bridge width, span ...

AI Technical Summary

Problems solved by technology

[0006] CN106638313A provides a large-scale cover beam semi-prefabricated construction technology method, which is improved on the basis of CN 105780663 A, and adopts measures such as installing anti-expansion tie rods in the groove of the prefabricated U-shaped groove and adopting fiber concrete at the bottom of the shell to solve the problem of the first In the process of secondary pouring concrete, there are problems such as mold expansion deformation and prefabricated shell concrete cracking easily

[0010] The existing scheme meets the design and construction requirements of prefabricated assembly, but there are problems with complex on-site construction, which are mainly reflected in three aspects: ① Temporary supports are required to support the prefabricated components; ② The wet joint scheme requires cast-in-place formwork; ③ After Wear prestressed steel beam

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