公路隧道“防水板切割二衬”检测技术探讨

Discussionon Detection Techniques for “Secondary Lining Cut by Waterproof Plates” of Highway Tunnels

在素混凝土区段,二衬浇筑时混凝土通过防水板的接缝缺口穿透至防水板与初支之间,防水板松脱,造成防水板嵌入二衬中并形成切割二衬混凝土的现象,该类缺陷部位易形成掉块、严重威胁行车安全,必须进行处治。为判定隧道结构安全性和为处治设计提供依据,处治前的检测数据应详细、可靠。根据实践经验并结合工程实例,归纳了缺陷特征,分析了缺陷形成原因,提出了应实施的检测项目、检测方法和缺陷处治措施。

In the section of plain concrete, the waterproof board has been penetrated by concrete through the joint gap between the waterproof board and the initial support in concrete pouring, which has caused the phenomenon of waterproof board cut and embedded in the secondary lining.Such defects have been easy to form dropped pieces and threaten the traffic safety seriously.In order to judge the safety of tunnel and provide basis for treatment design, the detecting data should be accurate and reliable.Being based on practical work experience and engineering examples, the characteristics of defects have been summed up and the causes of defects have been analyzed in this paper.Then the detection items, detection methods and treatment measures for defects have been put forward.