Restorer for supporting swing of bridge pier

Abstract

The invention discloses a restorer for supporting swing of a bridge pier, which comprises a lower seat plate, an upper seat plate and a spherical crown seat plate, a fixed groove is formed in the center of the bottom of the upper seat plate, a plane boss is arranged in the middle of the lower seat plate, a swing bulge is arranged in the center of the plane boss, and the swing bulge and the fixed groove are correspondingly arranged and are in clearance fit; a plurality of rotating ball grooves embedded with spherical crown seat plates are uniformly distributed in the end surface of the plane boss, and the upper surfaces of the embedded spherical crown seat plates are higher than the end surface of the plane boss, so that the lower bottom surface of the upper seat plate falls on the upper surfaces of the spherical crown seat plates; the upper base plate outside the fixing groove is provided with centrosymmetric prestressing tendon holes, a plurality of prestressing tendon stepped holes are further formed in the plane boss in a penetrating mode, prestressing tendons are arranged in the prestressing tendon stepped holes, the other ends of the prestressing tendons upwards penetrate through the prestressing tendon holes of the lower base plate, the upper base plate and the pier, and the tensioning ends of the prestressing tendons are fixed to the top of the pier. According to the invention, a bridge structure is protected by swinging seismic mitigation and isolation in an earthquake, and a self-resetting function is realized after the earthquake.

Description

technical field [0001] The invention belongs to the technical field of bridge structure construction, and in particular relates to a resetter for supporting the swing of bridge piers. Background technique [0002] There are many studies on bridges with earthquake-recoverable functional structures, and swing piers are one of the main objects of current research. A typical swing pier system consists of three parts: concrete pier columns, unbonded prestressed steel strands and dampers. Dry joints are set between the swing pier, the superstructure and the cap, and the superstructure, pier are connected by unbonded prestressed strands. Integrate with the platform as a whole. The seismic energy is dissipated through the continuous "opening" and "closing" of the connection between the pier, the superstructure and the cap under the action of the earthquake. [0003] Due to the fact that the dry joints are in line contact during the earthquake shaking process, the force concentrati...

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Problems solved by technology

[0003] Due to the fact that the dry joints are in line contact during the earthquake shaking process, the force concentration is relatively obvious, which will cause different degrees of damage and damage, and bring many difficulties to the repair and operation of the caps and piers after the earthquake

At the same time, since the bridge pier and the cap are completely dependent on the unbonded prestress and the damper to bear the horizontal force, the former of the above two components mainly bears the prestress, and the latter mainly bears the damping force in the deformation direction, without centering and limiting sliding; In addition, under the seismic force at an included angle with the vertical and horizontal bridge directions, the swing fulcrum of the swing pier is only a point, and the stress concentration is high.

The above factors have increased the safety hazards of the rocking pier under the earthquake to a certain extent

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