利用既有人防隧道改造地铁区间隧道方法探讨

Discussion on the Method of Transformation and Extension of Existing Civil Air Defence Tunnel into Metro Tunnel

以重庆地铁一号线小什字至燕喜洞3.2 km人防隧道改造为依托,对利用既有人防隧道改造、扩建为区间隧道的方法进行探讨,以期对类似工程有一定借鉴意义。在分析既有人防隧道测量、检测资料基础上,提出了利用既有人防隧道改建为地铁区间隧道时线路、限界的设计原则及方法,研究了毛洞段、衬砌段既有人防隧道的改造方法,重点阐述了利用既有二次衬砌存在的问题。利用既有人防隧道改造为地铁隧道可更有效地利用地下空间、减少工程投资、加快建设工期及终结既有人防隧道安全风险。

Relying on the reconstruction of existing civil air defense tunnel which is around 3.2 kilometers and at the planned location of Chongqing metro line 1（ section Xiaoshizi to Yanxidong）,this paper discussed methods of transformation and extension of the existing civil air defense tunnel. It is hoped that this can provide some references to similar projects. By the analysis on the data of measurement and detection of the existing civil air defense tunnel,this paper presents design principle and limit of the line and boundary of metro tunnel which transformed from existing civil air defense tunnel; the reconstruction method of unlined tunnel section and lined tunnel section of existing civil air defense tunnel is studied. The problems in using existing secondary lining are described. By using the existing civil air defense tunnel transformed into metro tunnel,we can use the underground space more effectively,reduce the engineering investment,speed up the construction＇s schedule and end up the security risk of the existing civil air defense tunnel.