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近二十年来,国内外对防渗墙施工技术发展很快,钻孔深度可达100米以上,造孔机具为反循环钻机、抓斗等,造孔速度快,可大大提高工效,造孔垂直精度控制达1/800～1/1000,使槽段间混凝土结合良好,保证墙的最小厚度,槽段接头采取许多先进措施,如接头管拔管法,双月牙钻头、接头盒等,加快施工进度。有些防渗墙由于拉力或压力过大采用了局部加钢筋技术,速度也可以很快。坝体填料压实,可提高变形模量,减少防渗墙的水平位移,对防渗墙的安全有利。压实方法除振动碾外,又发展了振冲法及强夯法,可比振动碾工效大大提高。这些技术发展使防渗墙用途更广泛,工效提高,成本降低。现就防渗墙施工中的几个问题简介如下,作为《人民长江》1984年第1期“国内外土石坝及围堰防渗墙技术发展简介”一文的续篇。
In recent two decades, the construction technology of impervious wall has developed rapidly both at home and abroad with the drilling depth up to 100 meters. The hole making equipment is a reverse circulation drilling machine, a grab bucket and the like. The hole making speed is fast, which can greatly improve work efficiency and make holes Vertical precision control up to 1/800 ~ 1/1000, so that the concrete between the slot joints well to ensure that the minimum thickness of the wall, slot joints to take many advanced measures, such as connector pipe extubation law, double crescent bits, joint boxes, etc., to speed up Construction Schedule. Some cut-off walls due to excessive tension or pressure using local plus steel technology, the speed can be very fast. The compaction of the dam body packing can increase the deformation modulus and reduce the horizontal displacement of the cutoff wall, which is good for the safety of the cutoff wall. Compaction method in addition to vibration outside the mill, but also the development of vibro-vibrating method and dynamic compaction method, comparable vibratory grinding efficiency greatly increased. The development of these technologies makes the seepage prevention wall more widely used, the work efficiency is improved and the cost is reduced. Now on the construction of impervious wall a few of the issues described below, as the “People’s Yangtze River” in 1984 No. 1 “at home and abroad embankment and cofferdam impermeable wall technology development,” a sequel to the article.