米仓山隧道深大竖井建井新法  

New Construction Technology for Deep and Large Vertical Shaft in Micangshan Tunnel

作　　者：唐协 林国进 何佳 安俊吉 周雄华 张睿 TANG Xie;LIN Guojin;HE Jia;AN Junji;ZHOU Xionghua;ZHANG Rui(Sichuan Provincial Transport Department Highway Planning, Survey, Design and Research Institute, Sichuan 610041, Chengdu, China;Tunnel Specialized Committee, Sichuan Provincial Highway Association, Sichuan 610041, Chengdu, China;Sichuan Ba Shan Expressway Co., Ltd., Sichuan 610041, Chengdu, China;Sichuan Road & Bridge (Group) Co. , Ltd. , Sichuan 610041, Chengdu, China)

机构地区：[1]四川省交通运输厅公路规划勘察设计研究院,四川成都610041 [2]四川省公路学会隧道专业委员会,四川成都610041 [3]四川巴陕高速公路有限责任公司,四川成都610041 [4]四川路桥建设集团股份有限公司,四川成都610041

出　　处：《隧道建设（中英文）》2019年第2期268-274,共7页Tunnel Construction

基　　金：四川省交通科技项目(2010A1-2)

摘　　要：为解决目前公路行业面临的大直径竖井建设缺乏相关规范支撑和竖井主要采用复合式衬砌及单行掘砌作业带来的工序复杂、建井速度慢、缺乏相应施工机械配套和安全性较差等难题,通过吸收煤矿深大竖井主流支护与掘砌技术,结合公路运营情况考虑送风井与排风井分设或通过中隔墙合设的布置方式,在公路行业现有支护与掘砌技术的基础上,对米仓山隧道通风竖井进行多方案研究,最终选定单层模筑混凝土衬砌与短段掘砌混合作业单井布置方案,并采用该方案安全快速地建成净直径9 m、深431.8 m的深大竖井。工程实践表明:1)在同等通风面积下双井工程量要小于单井工程量,但由于其配套施工设备造价高,单井造价要低于双井造价; 2)单层模筑混凝土衬砌与短段掘砌混合作业方式在进度和施工安全等方面优于复合式衬砌及掘砌单行作业方式,可作为公路深大竖井建井新方法。研究结果可为今后深大竖井的修建提供技术支撑和为规范的修订积累经验。At present, there is a lack of relevant construction standard for large-diameter vertical shafts of highway;and the composite lining and single-row operation would induce complex working procedure, slow construction speed, deficient corresponding construction machinery and low safety. Hence, based on the main supporting and excavation technology of deep shaft in coal mine, ventilation shaft layout of operation highway tunnel, and existing supporting and excavation technology of highway, the vertical ventilation shaft schemes of Micangshan Tunnel are studied. The single shaft layout scheme of single-layer formwork concrete lining and short section excavation and lining is selected, which has been successfully applied to a deep vertical shaft with diameter of 9 m and depth of 431.8 m. The engineering practice shows that:(1) Under the same ventilation area, the engineering quantity of double shaft is less than that of single shaft, but the cost is higher than single shaft due to its high equipment cost.(2) The construction schedule and safety of single-layer formwork concrete lining and short section excavation and lining are superior to those of single-row operation of composite lining and excavation. The results can provide technical support and experience for the construction of deep and large vertical shafts in the future.

关 键 词：公路隧道 竖井 方案比选 单行作业 单层井壁 短段掘砌作业 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]