摘要
目的:为了解决冻结法施工联络通道存在的渗漏部位多、渗水量大、治理难度高等问题,需分析冻结法施工联络通道的渗漏原因,并提出治理方法。方法:通过总结渗漏部位的分布情况,从地层冻胀融沉效应出发,结合相关案例对融沉注浆不到位的情况下的联络通道及附近管片最大沉降量进行分析,判断出联络通道与主隧道连接部位容易产生差异沉降。分析联络通道施工过程中的受力体系转换过程,并对主隧道钢管片的工作状态、洞门位置细部构造的施工质量及冻结管封堵措施的落实情况进行调查研究。结果及结论:研究发现,地层冻胀融沉效应引起的结构附加沉降、施工过程中频繁的受力体系转换造成的连接部位应力集中、钢管片服役初期处于亚健康工作状态、洞门位置细部构造施工质量缺陷及冻结管封堵措施不佳等都是造成联络通道渗漏的原因。对此,制定了“检测先行、科学评价、内外结合、综合治理”的联络通道渗漏水病害治理原则,并提出了以监测检测结果为基础的涵盖管片背后注浆、管片格腔渗漏水病害治理、管片接缝渗漏水病害治理、冻结管口渗漏水病害治理、洞门顶部混凝土缺陷治理、洞门侧墙与底板施工缝渗漏水病害治理等一系列方法。
Objective:In order to solve the problems of multiple WSL(water seepage and leakage)points,large water seepage amount and high treatment difficulty in freezing construction link passage,it is necessary to analyze the causes for WSL in freezing construction link passage,and propose treatment measures.Method:By summarizing the distribution of WSL locations,starting from ground freezing and thawing settlement effect,combined with analysis of link passage and adjacent segment maximum settlement in case of insufficient thawing settlement grouting based on relevant cases,it is derived that the joint part of link passage and main tunnel is prone to differential settlement.The stress system transformation process during link passage construction is analyzed,investigation and research is conducted on the working state of main tunnel steel lining segments,the construction quality of tunnel portal position structural details,and the implementation condition of blocking measures for freezing pipes.Result&Conclusion:It is found that the structure additional settlement caused by ground freezing and thawing settlement effect,the stress concentration at the joint part caused by frequent stress system transformation during construction,the sub-healthy working state of steel lining segments at the initial service stage,the construction quality defects of tunnel portal position structural details,and the poor blocking measure performance for freezing pipes are all causes of WSL in link passages.Therefore,the principle of′inspection first,scientific evaluation,internal-external combination,comprehensive treatment′for the treatment of link passage WSL diseases is formulated,and a series of measures are proposed,including grouting behind the lining segment based on monitoring and detection results,WSL disease treatment of lining segment grid cavity,WSL disease treatment of lining segment joint,WSL disease treatment of freeze pipe mouth,defect treatment of tunnel face top concrete mass,and WSL disease treatment of the construction j
作者
赵江涛
王笑欢
程敏
牛晓凯
姚旭飞
ZHAO Jiangtao;WANG Xiaohuan;CHENG Min;NIU Xiaokai;YAO Xufei(Beijing Construction Engineering Quality Third Inspection Institute Co.,Ltd.,100037,Beijing,China;不详)
出处
《城市轨道交通研究》
北大核心
2023年第8期77-81,88,共6页
Urban Mass Transit
关键词
地铁
渗漏水病害治理
冻结法施工
联络通道
metro
water seepage and leakage disease treatment
freezing construction
link passage
