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1 概述砼防渗墙是在松散透水地基或土石坝(堰)体中连续造孔成槽,以泥浆固壁,在泥浆下浇筑砼而建成的,有不少地基中含有坚硬的大孤石(1～5m 左右)甚至巨石,从而在防渗墙施工过程中,发生各类孔故。一旦发生孔故,要立即分析孔故发生的原因,拟定出有效的处理方案,将孔故排除。在用钢绳冲击钻机施工砼防渗墙中,常见的孔故有孔偏、卡钻,掉钻、埋钻、漏浆、塌孔等。下面分别介绍几种孔故出现的原因、预防和处理办法。2 孔故的处理及预防
1 Overview Concrete impervious wall is loose porous foundation or earth-rock dam (weir) body continuous hole into the groove to mud wall, pouring concrete in the mud and built, there are many foundations containing hard bouldering stone (1 ~ 5m or so) or even boulders, so that in the cut-off wall construction process, the occurrence of all kinds of holes. In the event of a hole, it is necessary to immediately analyze the cause of the hole, to develop an effective treatment program to eliminate holes. In the construction of concrete cutoff wall with steel wire rope impact drilling rig, holes are commonly found holes, sticking, drilling, burying, leaking slurry, collapse hole and so on. Here are the reasons for the emergence of several holes, prevention and treatment. 2 holes so the treatment and prevention