轻型井点降水技术在输电线路杆塔基础流沙基坑开挖中的应用

Application of Light Well Point Dewatering in Quicksand Foundation Pit Excavation of Transmission Line Foundation

输电线路杆塔基础流沙基坑开挖的传统施工方法是先采用钢管架、挡土板等基坑支护措施进行支挡,然后在基础施工前用泵将基坑中的水抽出,存在基坑平整度得不到保证,混凝土方量较大,基础容易外露等问题。将轻型井点降水技术应用到输电线路杆塔基础流沙基坑施工中,可以克服输电线路基础在粉细沙、细沙地质基坑施工时的涌水塌孔及基坑难以成型等问题,设计时通过选用钢筋混凝土板式基础,提高了经济、环保效益。

The traditional construction method was using steel pipe frame,retaining plate and other foundation pit supporting measures for retaining in the foundation pit excavation of transmission line foundation,and then pumped out the water in the foundation pits,foundation pit roughness could not be guaranteed,concrete amount was larg and the foundation was exposed easily.The application of well point dewatering technique to the sand flow pit construction of transmission line foundation could overcome the shortcomings of water gushing collapse hole and foundation pit hard to be formed when the transmission line foundation was constructed in fine sand and fine sand geological foundation pit.In the design,reinforced concrete slab foundation was adopted to achieve considerable economic and environmental benefits.