Construction method of integral abutment of jointless bridge and integral abutment

Abstract

The invention discloses a construction method of an integral abutment of a jointless bridge. The construction method comprises the steps of constructing an abutment bearing section at the upper end ofa bearing platform, fixedly connecting the bearing platform to the upper end of pile foundations, placing an abutment post-casting section formwork and a temporary supporting system on the abutment bearing section, placing the temporary supporting system in the abutment post-casting section formwork, filling sand in the abutment post-casting section formwork, constructing an abutment transition section on the filled sand in the abutment post-casting section formwork, integrally casting and consolidating the upper end of the abutment transition section and a main beam, washing away the filledsand in the abutment post-casting section formwork after longitudinal prestressed steel strands in the main beam are tensioned, pouring concrete into the abutment post-casting section formwork to formand maintain an abutment post-casting section, and sequentially connecting the abutment transition section, the abutment post-casting section and the abutment bearing section from top to bottom to form the integral abutment of the jointless bridge. The invention also discloses the integral abutment of the jointless bridge. The construction method of the integral abutment of the jointless bridge and the integral abutment increase the introduction degree of the prestress.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to an integral abutment construction method of a bridge without expansion joints and an integral abutment of a bridge without expansion joints. Background technique [0002] At present, the commonly used girder bridges in my country are all bridges with expansion joints and supports. However, vulnerable components such as expansion joints and bearings bring great troubles to the maintenance and repair of bridges; therefore, for medium and small bridges with small overall lengths, designers are gradually keen on adopting integral seamless beam bridges. That is, the bridge pier, abutment and main girder are consolidated, the bridge support and expansion joints are canceled, and the longitudinal deformation of the main girder due to temperature is absorbed by the pier, abutment and backfill soil behind the abutment. For girder bridges with small spans (generally less than 20m), ordina...

AI Technical Summary

Problems solved by technology

If the prestress is applied after integral pouring, the longitudinal prestress of the main girder cannot be effectively applied to the main girder due to the influence of the static indetermination of the integral seamless beam bridge, especially the high stiffness of the end wall, and the prestress is introduced into the main girder. The stretching efficiency is extremely low, and some even have the possibility of end wall cracking during the tensioning process

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