地下连续墙在富水粉砂层中降水加固成槽施工技术

对宁波市轨道交通2号线TJ2108标主体围护结构地下连续墙,在富水粉砂层中的3种不同试验结果进行比较,最终采用降水加固成槽,地下连续墙施工顺序为降水→导墙→钢筋笼制作→泥浆制备及成槽→下锁口管→下钢筋笼→水下浇筑砼→拔锁口管→下一幅槽段循环该种方法达到了质量安全可控,经济效益明显,可为设计、施工提供借鉴经验.

Precipitation Strengthening Grooving Construction Technology in Water-rich Sand Stratum in Underground Continuous Wall

Three kinds of test of underground continuous wall retaining structure in water-rich sand were carried out in Ningbo rail transit Line 2'' s TJ2108 standard body. According to the test results, the final selection in water -rich sand is precipitation strengthening into a groove. The processes is precipitation, guide wall, making reinforcing cage, slurry preparation and forming into a groove, locking mouth tube, reinforcing cage, casting concrete underwater, pulling out lock mouth tube, and next slot cycle. The method could ensure the quality and safety control, and achieve obvious economic benefit. The construction method of underground continuous wall in water-rich sand will provide references for similar design and construction.