大直径有压输水隧洞伸缩缝密闭性试验  

Tightness Detection of Expansion Joint in Large Diameter Pressurized Water Conveyance Tunnel

作　　者：施笋 杨富强 姚韦靖 SHI Sun;YANG Fu-qiang;YAO Wei-jing(Beijing Uni-Construction Municipal Road and Bridge Engineering Co.Ltd.,Beijing 100028,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]北京住总市政道桥工程有限责任公司,北京100028 [2]安徽理工大学土木建筑学院,淮南232001

出　　处：《科学技术与工程》2022年第26期11623-11629,共7页Science Technology and Engineering

基　　金：国家安全生产监督管理总局安全生产重大事故防治关键技术科技项目(anui-0003-2016AQ);安徽省高校自然科学重大项目(KJ2015ZD20)。

摘　　要：为了增强地下有压输水隧洞运营的安全性,隧洞伸缩缝密闭性检测就成了不可或缺重要手段。以北京市南水北调输水隧洞工程为背景,通过现场反复试验研究了一套整体性、可行动性强的大直径隧洞伸缩缝检测装置,该装置包括“门架+丝杆+钢拱架”一体化支撑体系和“中空弧形凸起凹槽式”断面天然橡胶圈密封腔体系。结果表明:一体化支撑体系操作简便,可重复利用,检测周期短;“中空弧形凸起凹槽式”断面的天然橡胶圈不仅增大了橡胶的压缩量也提高了与混凝土表面的贴合度,结合一体化的支撑系统,提升了密封腔的密闭性,达到了密闭性检测的目标。同时,在现场试验应用的基础上,对检测装置支撑体系提出了进一步优化建议,为后续更快捷的检测有压输水隧洞伸缩缝密封性提供参考依据。In order to enhance the safety of underground pressurized water tunnel operation,tunnel expansion joint tightness detection has become an indispensable means.In this paper,based on the Beijing South-to-North Water Diversion Project,a set of large-diameter tunnel expansion joint detection device with integrity and strong mobility was studied through repeated field tests.The device included the integrated support system of‘portal frame+screw+steel arch’and the natural rubber ring sealing cavity system of‘hollow arc convex groove type’section.The results show that the integrated support system is easy to operate,reusable,and has a short detection cycle.The natural rubber ring with‘hollow arc convex groove’section not only increases the compression of rubber,but also improve the adhesion to the surface of concrete.Combined with the integrated support system,the tightness of the sealing cavity is improved,and the goal of tightness detection is achieved.At the same time,on the basis of field test application,further optimization suggestions are put forward for the support system of the detection device,which provid reference for the subsequent faster detection of the sealing of the expansion joint of the pressurized water conveyance tunnel.

关 键 词：大直径有压输水隧洞 运营安全 伸缩缝密闭性 支撑体系 密封腔体系 

分 类 号：TV672.1[水利工程—水利水电工程]