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Construction method of alternately jacking with variable slope ratio of continuous girder bridge

A construction method and jacking technology, applied in bridges, bridge maintenance, bridge reinforcement, etc., can solve problems such as the compression of the bracket system of the steel support block and the hidden danger of the unsafe jacking system, so as to ensure the safety of the structure. , to ensure the effect of safety

Active Publication Date: 2015-11-11
CHENGDU CONSTR ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The traditional continuous girder bridge jacking construction is difficult to solve the compression of the bracket system of the steel support pad, such as the sudden failure of the jack, which will cause unsafe hazards in the jacking system

Method used

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  • Construction method of alternately jacking with variable slope ratio of continuous girder bridge
  • Construction method of alternately jacking with variable slope ratio of continuous girder bridge
  • Construction method of alternately jacking with variable slope ratio of continuous girder bridge

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Embodiment Construction

[0029] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0030] Such as Figure 1 to Figure 5 As shown, a continuous girder bridge slope-changing ratio alternate jacking construction method includes the following steps:

[0031] (1) Install the distribution beam at the bottom of the bridge structure 2 to be lifted. The distribution beam is located at the front and back of the pier and inside the abutment. Two sets of jacks are installed at the bottom of the distribution beam, namely the first set of jacks 1a and the second set of jacks 1b, and There are 4 jacks in each group, so that the piston of the jack is set downward, and a steel support pad 3 of equal height is placed at the lower end of the piston. The steel support pad 3 is a steel pipe with flanges welded at both ends. The first steel support The lower end is connected to the pier cap through pre-embedded implanted anchor bolts;

[0032] (2) C...

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Abstract

The invention discloses a slope-variable proportional alternate jacking construction method for continuous beam bridges. The slope-variable proportional alternate jacking construction method includes setting two groups of jacks capable of actively applying jacking force at the bottom of a bridge structure corresponding to fronts and backs of a pier and an abutment; enabling a control panel to control a hydraulic pump station to drive the two groups of jacks to carry out slope-variable proportional alternate jacking; and plugging temporary steel support cushion blocks at bottoms of one group of jacks when the other group of jacks performs jacking so as to eliminate height differences among various support points. The slope-variable proportional alternate jacking construction method has the advantages that the safety of the bridge structure is effectively guaranteed in a jacking procedure; and the requirement on a design gesture of an existing beam is met by the continuous slope-variable proportional alternate jacking method, and accordingly the purpose of modifying an existing bridge is achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge jacking construction, and in particular relates to an alternate jacking construction method of continuous beams with variable slope ratios. Background technique [0002] With the rapid development of social economy, in the process of municipal road reconstruction, it is often necessary to renovate existing overpass bridges such as extension and slope change, and its uplink and downlink approach bridges need to be lifted to the same level as the proposed new bridge. high. During the bridge construction process, it is necessary to strictly control the displacement difference at each pier and abutment position (at the apex) for the jacking of the continuous girder bridge. With the conventional gap protection system, when the jack is switched to the temporary support during the jacking process, due to the compression deformation of the supporting steel pipe and the connection gap, the upper beam body ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D22/00
Inventor 邓家勋王翔章凡邓江云张静曾伟李维
Owner CHENGDU CONSTR ENG GROUP CORP
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