利用冲抓钻机造孔修建防渗墙

Utilizing Cased Bore-hole Impacted Grab to Construct Cut-Off Wall

套孔冲抓粘土防渗墙是利用冲抓钻机造孔,然后用合格的粘性土料分层回填空孔,主、副孔相间布置,最终形成一道连续套接的粘土防渗墙,截断渗流通道,起到防渗效果。该技术具有施工简便、工效较高、投资省、防渗效果好等特点。根据湖北省京山县八字门水库除险加固工程大坝心墙加高的施工情况,介绍了该技术的施工工艺特点,分析了施工质量控制的要点和措施,以期对类似工程有所参考。

The cased bore-hole impactgrab clay cut-off wall utilizes the impact-grab drilling machine to drill holes first,then applies the qualified viscous stratified clay to backfill hollow holes,and the main and auxiliary holes are alternately distributed,ultimately forms a continuous joint clay cut-off wall which can cut-off seepage channel.This technology is simple in construction with high working efficiency,low investment and good anti-seepage effect.According to the construction situation of heightening the core wall of the dam of Bazimen reservoir in Jingshan County,Hubei Province,the technological characteristics is introduced and the focus and measures of quality control are analyzed.