Bridge transverse anti-overturning performance improving and transforming method

Abstract

The invention discloses a bridge transverse anti-overturning performance improving and transforming method which comprises the following steps that a single-column pier bridge box girder is integrally jacked, a lower chord and a box girder bottom plate girder body are fixed through chemical anchor bolts, the two ends of the lower chord are overhung and extend out of a box girder bottom plate, and after the lower chord is fixed, the box girder is integrally connected and falls back; a straight web member is fixed on a box girder web plate through chemical anchor bolts, a lower gusset plate and an inclined gusset plate are fixed on a lower chord member through bolts, an upper gusset plate is fixed on the straight web member through bolts, and the inclined web member is connected with the lower chord member and the straight web member through the upper gusset plate and the inclined gusset plate to form a rigid framework; anchor bars are implanted into the two sides of the abutment bent cap and penetrate through reserved holes of the lower chord; lacing bars are respectively welded on the straight web members and the inclined web members for longitudinal stiffening, and lacing bars are welded between the upper gusset plates. The structure stress is clear, and the stress of an original structure system is not changed; overall torsional deformation of the box girder under the action of overloading and unbalance loading can be effectively limited and restrained, and the risk of transverse overturning of a single-pier bridge is prevented and eliminated.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a method for improving and transforming the transverse anti-overturning performance of a bridge. Background technique [0002] According to the research on the overall lateral overturning of many bridges with single-pillar piers under the action of vehicle overweight and eccentric loads, the direct cause of the bridge's lateral overturning instability is that the instability effect caused by eccentric loads far exceeds the stability effect of the bridge superstructure, resulting in bridge support system Failure, relative slip and rotation occurred between the box girder body and the pier column. According to the principle of "one bridge, one policy", it is an important way to prevent and resolve the safety risks of single-pillar bridges through corresponding reconstruction and reinforcement of the bridge structure with single-pillar piers. At present, the ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the lateral anti-overturning performance of bridges, which solves the problems of poor torsional deformation resistance of the overall box girder of single-pillar pier bridges and high risk of overturning instability in the transverse bridge direction.

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