Study On The Resetting Technology Of Modular Jack

In recent years, with the development of highway and city construction make a spurt ofprogress, our country bridge quantity growth speed. Due to the reasons for design reasons,construction reasons, natural causes, caused by the beam body position offset diseases areincreasing. At present, the bridge body shift reset method adopts Jack jacking constructionway, push beam reinforcement method with the pushing device and auxiliary device ofdifferent multiple process.Taking Xi’an Daxing Road interchange ramp bridge project as an example, by analyzingthe present situation of bridge damage detection results. On continuous curved bridge byusing the reset process of the stress and strain state and construction safety and reliability ofnumerical simulation is carried out by finite element method. Stress analysis of the mostunfavorable situation for a variety of possible reduction process, and according to the analysisresults to determine the reduction guidance in engineering facilities, temporary reinforcementscheme combined jack process and key points of control, construction monitoring programme,ensure the smooth implementation of the re engineering.The reduction of continuous curved bridge under seismic damage impact shift is feasibleusing modular jack reset technique. Compared with the traditional counter force frame, withequipment installation is simple, the reset speed, wide application range, no beam and piercolumn internal force, guarantee the reset process safety, and has good social and economicbenefits. The technology has wide significance in the beam body reduction.