北京市南水北调配套大宁调蓄水库防渗墙工程,是北京市近年来最大的防渗墙工程。该项目地质情况复杂,为砂卵石含砾和漂石地层,施工难度大,成槽困难。通过对本工程地质情况进行分析、总结,并进行多种成槽工艺的对比摸索,采用了直抓法与钻抓法相结合的成槽施工技术,取得了良好的效果,提高了施工进度,降低了工程成本。 Beijing Danshui Reservoir Diaphragm Wall Project supporting North Water Transfer Project is the largest impermeable wall project in Beijing in recent years. The geological conditions of the project are complex, gravel and boulder stratum with sand and gravel, difficult to construct and difficult to sink. By analyzing and summarizing the geological conditions of the project and comparing and groaning a variety of trenching processes, the trenching technology combining the straight catching method and the drilling and catching method has been adopted and good results have been achieved, the construction progress has been improved and the construction schedule has been reduced Engineering costs.