跨越既有线大桥门式墩施工技术

Construction Technology of Door-Type Pier Crossing the Existing Bridge

由于既有线路两侧信号、通信和电力管线非常多，场地狭窄，大型机械设备无法作业，导致跨越既有线施工组织协调难度大，施工周期长。跨越既有线的大桥施工，要调查、迁改保护管线，移改水沟，填筑既有路基两侧的施工作业平台，做好防护桩，保持既有铁路路基边坡稳定，加强变形观测，变形量过大时，及时采取加固措施。

Because there are quite many of signal,communication and power lines on both sides of the existing line and whose site is narrow,large-scale machinery and equipment cannot work on it,it causes difficult construction organization and coordination and long construction period on the existing line.During the large bridge construction on across existing line,it should investigate,move and protect pipeline,change ditch,fill construction working platform on both sides of ex-isted embankment,make pile protection,keep the existing railway embankment slope stability,strengthen deformation ob-servation.Besides,it should carry out reinforcement measures in time when the deformation is oversized.