摘要
新建川藏铁路拉萨至林芝段桑珠岭隧道一号横洞工区主要不良地质为高地温。针对高地温隧道特点,现场在普通支护体系基础上,通过增加保温隔热材料及原衬砌表面铺设一层隔热层等施工措施,以减少隧道围岩的热量向隧道内传递;其次增加隔热层混凝土防裂钢筋、优化混凝土配合比等措施降低混凝土水化热,以及适当延长洒水养护时间,加强混凝土保湿养护等综合施工措施,减少混凝土裂缝的产生与发展;达到隔绝岩温,降低环温,保障施工质量的目的。通过此段隔热衬砌施工,探索总结出了高地温隧道隔热衬砌施工有效的技术手段,取得了良好的施工效果,为其它高温隧道隔热衬砌施工提供有力的技术支撑和借鉴意义。
The main unfavorable geological condition in the No.1 horizontal tunnel of Sangzhuling tunnel in Lhasa Linzhi section of Sichuan Tibet railway is high ground temperature.According to the characteristics of high ground temperature tunnel,on the basis of ordinary support system,the construction measures such as adding thermal insulation materials and laying a layer of thermal insulation layer on the surface of the original lining are adopted to reduce the heat transfer from the surrounding rock of the tunnel to the tunnel.Secondly,it can reduce the hydration heat of concrete by increasing the anti-cracking steel bar of insulating layer concrete,optimizing concrete mix ratio and so on and extend the curing time of sprinkling water properly,strengthen the comprehensive construction measures such as moisturizing and curing of concrete,so as to reduce the occurrence and development of concrete cracks and achieve the purpose of isolating rock temperature and reducing ring temperature and ensuring construction quality.Through the construction of this section of thermal insulation lining,this paper explores and summarizes the effective technical means of heat insulation lining construction of high temperature tunnel,obtains good construction effect and provides strong technical support and reference significance for other high temperature tunnel insulation lining construction.
作者
范辉
FAN Hui(Railway No.5 Bureau Group First Engineering Co.Ltd.,Changsha,Hunan,410117,China)
出处
《工程建设（维泽科技）》
2020年第6期114-119,共6页
Engineering Construction
关键词
桑珠岭隧道
高地温隔热衬砌
施工技术
Sangzhuling tunnel
high ground temperature insulation lining
construction technology
