Application Research On Synchronous Jacking Up By Hydraulic Pressure Controlling Of PLC For Yanshan Overpass In Jinan City

PLC the hydraulic control synchronization jacking technology was mainly used for the uplift and translational movement of the building at first. With its continuous development and improvement, and with the computer technology's popularity and development, this technology is gradually found and used in the field of traffic and highway construction. What's more, with leaping development of the highway engineering, its application range is constantly expanding in the field of highway and bridge. Engineering practice shows that the PLC technology is a new technology with good application prospect.This paper describes the use of system of PLC the hydraulic control synchronization jacking technology in the long-span continuous box-beams jacking-up technique. And a series of check computations is made including shearing force, pull force, local compression of concrete, overall stability, sub-limb stability. Also it makes emergency plans for variety of adverse situations that may arise and construction monitoring during the building's engineering construction process, which will provide operational experience for similar engineering renovation in future.Compared to traditional program of demolition and reconstruction, the system of PLC the hydraulic control synchronization jacking technology both save investment costs and shorten the construction period by using bridge lifting technology. In addition, it brings the pressure of its little effect on traffic movement, while environmental pollution is minimal. And construction waste, noise, dust, or water and electricity consumption are much lower than the reconstruction. More importantly, it provides useful help for reconstruction of old bridge in the future.