江津中渡长江大桥隧道式锚碇大落差预应力管道压浆施工技术

Grouting Construction of Prestressed Pipeline with Large Drop of Tunnel Anchorage for Jiangjin Zhongdu Yangtze River Bridge

江津中渡长江大桥为主跨600m的双面悬索桥,北岸采用隧道式锚碇,隧道锚锚塞体设计无后锚室,故预应力管道压浆时浆液沿管道先从前锚面进入,至后锚面位置弯转180°后与预应力管道连接,最后从前锚面出浆,而前锚面与后锚面高差达36m,目前,隧道式锚碇尚无此类参照性压浆施工工艺。中渡长江大桥项目在正式施工前研究了隧道锚大落差预应力管道压浆施工技术,并进行模拟管道压浆试验及1∶1大落差压浆试验,采用智能压浆机与智能压浆系统,并根据模拟试验结果制定切实可行的预应力管道压浆方案,保证了压浆质量。

Jiangjin Zhongdu Yangtze River Bridge is a double-sided suspension bridge with the main span of 600 meters. The tunnel anchorage is used at the north shore. Besides,the tunnel anchorage body is designed without an anchor chamber. When the prestressed pipelines are pressed,grouting goes along with the pipe to the front of the anchor at first,then after the position of the anchor is bent to 180 degrees,it is connected with the prestressed pipelines. And finally,the slurry comes out from the former anchor age surface. However,the height difference between the front anchorage surface and the latter anchorage surface is 36 meters. At present,there is no such reference grouting construction technique for tunnel anchorage. Before the formal construction of the Yangtze River Bridge project,the grouting construction technology of prestressed tunnel with large drop of anchorage is studied. Simulation pipeline pressure grouting tests and 1 ∶ 1 large drop grouting tests are also studied. Intelligent grouting machines and intelligent grouting systems are used during the process. According to the simulation test results,it is feasible to develop a practical prestressed pipeline grouting scheme to ensure the grouting quality.