Construction method for prefabricated box girder

Abstract

The invention provides a construction method for a prefabricated box girder. The construction method comprises the steps that a concrete pedestal is manufactured; an outer form board is arranged on the concrete pedestal so as to obtain a box girder side form; a bottom web reinforcement binding formwork and a top plate reinforcement binding formwork are manufactured separately, and reinforcement binding is carried out; a bottom web reinforcement which is bound and formed is integrally hoisted into the box girder side form, and then a box girder inner form board is arranged so as to obtain a boxgirder form board; a top plate reinforcement which is bound and formed is hoisted onto the box girder form board, and an inner form counter-pressure carrying pole is arranged; concrete of a base plate, a web and a top plate are poured, after forming, the form board is disassembled, and curing of a girder body is carried out; and after curing is finished, tensioning, mud jacking and anchor sealingtreatment are carried out so as to obtain the prefabricated box girder. The construction method has the advantages that the outer form board is assembled on the pedestal, the reinforcements are integrally hoisted into the form after being bound on the special formworks, so that the problems of joint treatment of the outer form board, flatness adjustment and the like can be conveniently solved, the phenomenon that the appearance of the base plate is affected due to the fact that welding slag impurities fall onto the pedestal can be avoided, and the appearance quality of the box girder can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method of a prefabricated box girder. Background technique [0002] In road traffic engineering, large and medium-sized bridge construction projects are increasing day by day, and most of the superstructure of bridges will adopt the form of prestressed continuous box girder. The precast concrete box girder is the main exposed load-bearing member of the bridge structure. Its construction technology and construction quality control will directly affect the overall stability and safety of the bridge structure, so it occupies a very important position in bridge construction. [0003] The conventional prefabricated beam construction process includes foundation installation, base plate and web reinforcement and prestressed installation, external formwork and internal formwork installation, roof reinforcement and prestressed installation, concrete pouring, for...

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Problems solved by technology

[0005] This application provides a construction method for prefabricated beams to solve the problems that welding slag or sundries are easy to fall into the base of prefabricated beams in the construction of existing prefabricated box girders, and it is difficult to adjust the joints and flatness of the formwork, so that the The problem of reduced appearance quality of prefabricated box girders

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