桐子林隧道上跨既有铁路隧道爆破施工技术

The Construction Technology of Acrossing the Existing Railway Tunnel in Tongzilin Tunnel

新建兰渝铁路桐子林隧道,为双线铁路隧道,二次分别上跨既有遂渝线桐子林隧道黄井联络线既有桐子林隧道,控制爆破难度大,安全风险高,既有线施工复杂,施工条件差。由于有针对性采取了合理的爆破技术、开挖方法,有效的防止了隧道塌方和对既有设备造成损坏等事故的发生,确保了既有营运线安全畅通,为上跨既有线隧道施工积累了经验。

The new building Tongzilin tunnel of lanzhou-chongqing railway is double line railway tunnel,which across Tongzilin tunnel twice from suining-chongqing line and Huangjing line. The controlled blasting is difficult, the security risk is high, existing lines are complex and construction condition is poor. Thanks to the rational blasting technology and excavation method, the probability of tunnel collapse and for both equipment damage and other accidents become lower. The line can work safely and open.What is more, accumulated the experience for the across existing lines on the tunnel construction.