Prefabrication and construction method of box girder in-situ pedestal

Abstract

The invention particularly relates to a prefabrication and construction method of a box girder in-situ pedestal, which solves the problems that cast-in-place box girders are high in cost and slow in progress and engineering construction is affected. The prefabrication and construction method includes: a, surveying lofting, performing replacement and layered compaction, and backfilling and tampering the area around an abutment; b, erecting a formwork to concrete a concrete pedestal serving as a bottom form, reserving pull bar holes on the top of the pedestal, and casting a concrete foundation around the pedestal; c, tying tie bars to fasten the bottoms of the lateral forms, using support bars to adjust the top elevation of the lateral forms, using a cup-lock scaffold to reinforce the lateral forms, and placing adjustable jacks and square timber on the top of the scaffold; d, pre-stressing the lateral forms to eliminate non-elastic deformation of a foundation and the scaffold, and correcting elevation of the foundation and the lateral forms again according to pre-stressing results; and e, sequentially installing bottom web reinforcement, inner membrane forms, top plate reinforcement and embedded parts, and pouring body concrete of the box girder. By the method, the stress effect of the forms can be improved greatly, and the prefabrication and construction method has the advantages of simple structure, reasonable design, simplicity in operation and effectiveness in use.

Description

technical field [0001] The invention relates to a construction method of a box girder, in particular to a prefabricated construction method of an in-situ pedestal of a box girder. Background technique [0002] Cast-in-place girder is one of the important ways to cross existing roads and canals. It has the characteristics of wide application and simple and easy-to-understand construction technology, which can greatly reduce the transportation cost of box girder. The existing box girder cast-in-place method has high construction costs and requires a large number of bowl buckle scaffolding. The progress is slow, and a large number of mechanical equipment is required. A large amount of space is required for the holes, which affects the construction of other tunnel projects. Contents of the invention [0003] In order to solve the problems of high cost, slow progress and influence on engineering construction in the cast-in-place method of the box girder, the invention provides ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high cost, slow progress and influence on engineering construction in the cast-in-place method of the box girder, the present invention provides a prefabricated construction method for the in-situ pedestal of the box girder

[0005] The box girder construction is directly prefabricated on the adjacent bridge pier, and the concrete pedestal distributes the weight of the box girder on the ground, which effectively solves the problem of slow progress and the need for a large number of mechanical equipment due to the need for a large number of bowl-buckle scaffolding in the cast-in-place method. , A large amount of space is required for via holes and problems affecting tunnel construction

Images