A Construction Method of Small and Medium Span Channel Girder Bridge

Abstract

The invention discloses a construction method for a medium and small span trough girder bridge. The method comprises the following steps: dividing a trough girder body into three members, which are an integral member of a left longitudinal girder and a left web plate, a bottom plate member and an integral member of a right longitudinal girder and a right web plate respectively, along a longitudinal vertical slit; casting in place on a substructure of the bridge and simultaneously prefabricating the three members on a prefabrication site; reserving a transverse reinforcement joint at the bottom of the prefabricated member and reserving transverse reinforcement joints on the left and right sides of the bottom plate; conveying the prefabricated members to the construction site after the construction and maintaining of the substructure are finished, lifting to a specific location by lifting equipment, arranging longitudinal reinforcements on site, binding, lapping or welding with the reserved transverse reinforcement joints, then pouring concrete at a joint section and performing construction and maintaining of the concrete at the joint section to form a body structure of the trough girder bridge. According to the construction method, the defects existing in the prior art are overcome, the construction processes can be simplified by prefabricating the members on the prefabrication site, the construction progress is quickened, the construction efficiency is improved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a bridge construction method, in particular to a construction method of a small and medium-span trough beam bridge. Background technique [0002] The construction of existing trough girder bridges mainly adopts the construction method of in-situ pouring (or "cast-in-place" for short). In this construction method, after the pouring and maintenance of the lower structure of the bridge is completed, the upper structure is poured. The main processes include: Erection of brackets and formwork at the construction site, bending of steel bars and welding of joints, welding, installation and fixing of steel skeletons, concrete mixing, transportation, pouring, vibration, maintenance, and formwork removal, support removal, etc. The existing construction method has many construction procedures and a long construction period. The erection error of the bracket and the formwork will aff...

AI Technical Summary

Problems solved by technology

The existing construction method has many construction procedures and a long construction period. The erection error of the bracket and the formwork will affect the construction quality. The construction quality is greatly affected by environmental factors such as temperature and humidity on the construction site. The shrinkage and creep effect of the concrete poured on site is obvious. The construction quality is not easy to control and the construction efficiency is not high

Invention patent ZL02137151.2 discloses a construction method for longitudinal assembly of prefabricated sections of channel girders. The construction method is to divide the channel girders into sections of channel girders along the bridge direction with horizontal vertical joints, prefabricate them in sections, and then Assemble the prefabricated segmental channel beams, and then stretch the longitudinal prestressed tendons to form the main structure of the channel beams. The advantage of this invention patent is that the prefabricated segmental channel beams are used, which avoids the disadvantages of the cast-in-place method. Defects, however, this invention patent is only applicable to trough girder bridges using longitudinal prestressed tendons. For small and medium-span trough girder bridges, ordinary steel bars can meet the requirements of stress and deformation without using longitudinal prestressed steel bars. Therefore, the construction method of this invention patent will not be able to be used for construction of small and medium span trough bridges

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