A new construction method for superstructure of multi-chamber continuous uhpc box girder bridge

Abstract

The invention discloses a novel multi-chamber continuous UHPC box girder bridge superstructure construction method, including UHPC prefabricated longitudinal block beam, UHPC prefabricated longitudinal block side beam, cast-in-place UHPC joint, prefabricated steel connector, shear force Nails, pre-embedded steel backing plates, pre-embedded bolts, temporary supports, permanent supports, stiffened beams, cast-in-place UHPC bottom plates, cast-in-place UHPC webs, cast-in-place UHPC roofs and thickened areas, simply supported system girders, stiffeners Beam floor, main beam web. The beneficial effect of the present invention is: the multi-chamber UHPC box girder is prefabricated in longitudinal blocks, assembled and connected on site through special connectors, and several multi-chamber simply supported box girders are first formed, and then passed on the pier by special The pouring method makes the box girder structure change from simply supported to continuous. The structural quality is excellent, the splicing is reliable, the mechanical performance and durability are good, the construction is convenient, the construction period can be greatly shortened, and the space under the bridge can be saved, which is very suitable for the needs 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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