Uneven jacking system and uneven jacking construction method for existing bridge superstructure

Abstract

The invention discloses an existing bridge superstructure uneven jacking system which comprises a hydraulic synchronous control system, each bearing platform is provided with an enlarged foundation inthe circumferential direction, and the enlarged foundation of each bridge pier is upwards connected with a plurality of pairs of heightening jack mechanisms and heightening temporary bridge pier mechanisms. The invention further discloses a corresponding construction method. The method comprises the steps that 1, the enlarged foundation is built; 2, the variable-height jack mechanisms and the variable-height temporary pier mechanisms are installed on the bearing platform and/or the expanded foundation in pairs; 3, pier cutting and jacking are conducted; 4, piers are connected; 5, a connectingpier and a bent cap are newly built; 6, beam falling is carried out. In updating of existing infrastructure of a city, the existing bridge structure can be fully utilized, waste is reduced, the construction efficiency is improved, jacking equipment is convenient to install, jacks participating in jacking cannot be damaged, and the jacking amplitude of jacking mechanisms at piers can be accuratelycontrolled.

Description

technical field [0001] The invention relates to the technical field of bridge jacking construction. Background technique [0002] In the construction or reconstruction (expansion) of the urban road system, the more developed the city, the more likely it is to encounter problems with the utilization of existing bridges. Utilizing existing bridges is economical and can effectively shorten the construction period. If it is decided to utilize existing bridges, the deck elevation and slope direction of the existing bridges need to be designed according to the overall design of the new or reconstructed (expanded) road system Adjustment requires jacking up of existing bridges. When jacking up existing bridges, there are the following technical problems: [0003] 1. The cap size of the existing bridge cannot meet the site requirements for the installation of jacking equipment, and it is difficult to install enough jacking equipment; if the number of jacking equipment is insufficie...

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Problems solved by technology

[0005] 3. During the jacking process, the beam body moves horizontally, which may easily cause damage to the bridge structure or damage the jack

[0006] 4. Due to the oblique jacking, the upward jacking speed of each pier is different, and the existing displacement synchronization control method is difficult to meet the needs of accurately controlling the jacking range of the jacking mechanism at each pier

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