Bridge abutment knocking-off structure

Abstract

The invention discloses a bridge abutment knocking-off structure, which comprises a bridge body and a bridge abutment body, and is characterized in that a knocking-off block is arranged on the top surface of the bridge abutment body, an anchoring steel bar is arranged between the knocking-off block and the bridge abutment body in a penetrating way for connection and position limitation, and a bridge end bracket is fixedly arranged on the end surface of the bridge body in a position positioned between the bridge body and the knocking-off block. The bridge abutment knocking-off structure has the advantages that (1) through the arrangement of the bridge end bracket, a large seam between the bridge end and a bridge abutment breast wall is reduced to an ordinary seam, an ordinary model expansion and contraction device is installed, the normal operation and small earthquake requirements are met, and the engineering manufacturing cost is reduced; (2) in strong earthquakes, the bridge end bracket pushes out the knocking-off block, the larger gap between the bridge end and the bridge abutment breast wall meets the relative displacement requirement of the bridge end and the bridge abutment breast wall in the strong earthquakes, the bridge abutment safety is ensured, the requirement of emergence vehicle passing after the earthquakes can be met, the normal use of a bridge can be recovered only through restoring the knocking-off block, the expansion and contraction device and the pavement behind the abutment, and the restoring cost is low.

Description

technical field [0001] The invention belongs to the technical field of anti-seismic technology of bridge abutments, and in particular relates to a bridge abutment knock-down structure. Background technique [0002] Previous earthquake disasters have shown that underestimation of earthquake displacement, resulting in insufficient reserved spacing between the girder body and the abutment, caused impact damage from time to time. For example, during the Wenchuan Earthquake of the Gaoyuan Bridge, the abutment breast wall on the plateau village side was smashed by the girder body and pushed into the subgrade by more than 50cm, the road surface bulged, and the abutment wing wall collapsed. [0003] In order to prevent abutments from being damaged under strong earthquakes, the current code for seismic design of urban bridges stipulates that abutments should not be used as components bearing inertial forces, and should remain elastic under the action of E2 earthquakes. In order to a...

AI Technical Summary

Problems solved by technology

A large gap is set between the beam and the breast wall of the abutment, forcing the telescopic device to adopt an oversized model, which increases the project cost to a certain extent and affects the landscape effect and driving comfort

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