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新安县引畛济涧工程属于调水工程,畛河水通过无压隧洞自流至新安县城。隧洞长度13.60km,断面采用城门洞型。供水隧洞穿越城区段与地面的垂直距离仅为40m~90m,爆破对地面建筑物及人员有很大影响,且炸药供应严重不足,极大制约了工程的进度。该洞段岩体多为Ⅴ类围岩,强度较低,经过大量调研,提出了采用悬臂式掘进机施工的建议。通过机器选型、施工组织、支护方案改进等措施,极大提高了工程进度,保证了穿越城区段的顺利施工,为悬臂式掘进机在水工隧洞中的应用提供了参考。
Xin’an County cited Jian Ji Jian Project is a water diversion project, Ba River flows through the pressure-free tunnel to Xinan County. The length of the tunnel is 13.60km. The section of the tunnel adopts the type of gate tunnel. The vertical distance between the water supply tunnel and the ground through the urban section is only 40m ~ 90m. Blasting has a great impact on the ground buildings and personnel, and the supply of explosives is seriously insufficient, greatly restricting the progress of the project. Most of the rock mass in this section is Grade V surrounding rock with low strength. After a lot of investigations, the suggestion of using cantilever boring machine is put forward. Through the selection of machinery, construction organization, support programs and other measures to improve and greatly improve the progress of the project to ensure the smooth construction through the urban section of the cantilever boring machine in the hydraulic tunnel provides a reference.