导杆式旋切成槽构筑薄防渗墙施工技术研究

Research on construction technology of guided rotary cutting into groove to construct anti-seepage thin wall

本文介绍了导杆式旋切成槽构筑薄防渗墙技术的施工工法、工作机理、技术特点和适用范围。为验证该技术的可行性、适用性及防渗效果,在某地铁站深基坑防渗工程中进行了试验性应用研究,现场开展成槽和浇筑工艺试验,根据地层特点和灰浆配比试验结果,合理确定水泥掺入比和适合的施工参数以指导薄防渗墙施工。基坑开挖过程中对防渗墙体进行现场钻孔取芯检查,芯样的抗压、抗渗性能均满足设计要求,未发现集中漏水点,坑壁呈干燥状态,防渗效果良好。试验应用中凸显出导杆式旋切成槽薄防渗墙技术施工工效高、综合单价低、场地适应性强等诸多优点。对类似基坑防渗工程具有一定的借鉴意义。

This paper introduces the construction method,working mechanism,technical characteristics and application scope of the guide bar type rotary cutting into the groove to construct the anti-seepage thin wall technology.In order to verify the feasibility,applicability and anti-seepage effect of the technology,a pilot application study was carried out in the deep foundation pit anti-seepage project of a subway station. The trenching and pouring process tests were carried out on site, according to the characteristics of the stratum and the mortar proportion test. As a result,the cement mixing ratio and suitable construction param eters were reasonably determined to guide the construction of the anti-seepage thin wall. In the excavation process of the foundation pit,the core of the anti-seepage wall was inspected for core drilling. The com pressiveness and impermeability of the core sample met the design requirements. No concentrated water leak age was found. The pit wall was dry and the anti-seepage effect was good. At the same time,it highlights the advantages of high efficiency,high comprehensive unit price and strong site adaptability of the guide bar type rotary cutting groove anti-seepage thin wall technology. It provide reference for similar foundation pit seepage prevention works.