Integral bridge abutment construction method and integral bridge abutment for jointless bridge

Abstract

The invention discloses an integral bridge abutment construction method for a jointless bridge, which comprises: constructing a bridge abutment bearing segment at the upper end of a bearing platform,and fixedly connecting the bearing platform to the upper end of a pile foundation; placing a bridge abutment late cast segment template and a temporary supporting system on the bridge abutment bearingsegment, enabling the temporary supporting system to be positioned in the bridge abutment late cast segment template, and filling the bridge abutment late cast segment template with sands; constructing a bridge abutment transition segment on the filled sands in the bridge abutment late cast segment template, carrying out integral pouring solidification on the upper end of the bridge abutment transition segment and a girder, after completing tensioning on longitudinal prestressed steel strands in the girder, washing away the filled sands in the bridge abutment late cast segment template, pouring concrete into the bridge abutment late cast segment template to form a bridge abutment late cast segment, carrying out maintenance, sequentially connecting the bridge abutment transition segment, the bridge abutment late cast segment and the bridge abutment bearing segment from top to bottom and forming an integral bridge abutment of the jointless bridge. The invention further discloses the integral bridge abutment of the jointless bridge. According to the integral bridge abutment construction method and the integral bridge abutment for the jointless bridge, an import degree of a prestressis improved.

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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