Novel construction method for upper structure of multi-chamber continuous UHPC box girder bridge

Abstract

The invention discloses a novel construction method for an upper structure of a multi-chamber continuous UHPC box girder bridge. The method invloves UHPC prefabricated longitudinal block middle beams,UHPC prefabricated longitudinal block boundary beams, cast-in-place UHPC joints, prefabricated steel connecting pieces, shear nails, embedded steel base plates, embedded bolts, temporary supports, permanent supports, stiffening cross beams, cast-in-place UHPC bottom plates, cast-in-place UHPC webs, cast-in-place UHPC top plates, thickening areas, simply supported system main beams, stiffening cross beam bottom plates and main beam webs. The method has the beneficial effects that multi-chamber UHPC box girders are longitudinally partitioned for prefabrication and are spliced and connected through the specially-made connecting pieces on site, a plurality of multi-chamber simply-supported box girders are formed firstly, and then the box girder structure is changed from a simply-supported mode to a continuous mode through a special pouring mode on the pier. The structure is excellent in quality, reliable in splicing, good in stress performance and durability, convenient to construct, capable of greatly shortening the construction period and saving the under-bridge space, and very suitable for the requirements of construction and development.

Description

technical field [0001] The invention relates to a construction method of a box girder bridge, in particular to a novel multi-chamber continuous UHPC box girder bridge superstructure construction method, and belongs to the technical field of connection structure and construction of a main girder at a bridge pier and a prefabricated beam. Background technique [0002] In urban bridges, prestressed concrete continuous wide box girder bridges are often used in the construction of urban bridges due to their excellent mechanical performance, good integrity, and beautiful appearance. However, due to the large overall volume and heavy overall weight of the wide box girder, prefabricated hoisting cannot be carried out for construction. At present, the construction method of on-site pouring is mainly used, and only a small part of the narrow box girder is constructed through prefabricated assembly. However, with the rapid development of the city, the urban traffic network is becoming ...

AI Technical Summary

Problems solved by technology

[0004] 2. Long construction period: cast-in-place continuous box girder needs a series of processes such as steel bar binding, formwork erection, concrete pouring, etc.

[0005] 3. The problem of construction quality control is serious: the quality control of cast-in-place continuous box girder is a difficult problem in the construction process. If it is not handled properly, many problems will arise, such as cracks caused by concrete drying shrinkage, steel strand breakage and Slipping wire phenomenon and appearance defects of concrete at the bottom of the beam, etc., serious safety accidents caused by formwork and support system

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