高水位流沙地段管沟二次双侧开挖的新方法

New Method of Secondary Trenching from Both Sides Used in Frozen Earth Area with High Water Table and Quicksand

以高水位流沙地段的管沟开挖为研究对象,利用陕北冬季冻土层厚度可达1.2 m的地域水文特征,在一次双侧沉管的基础上,探索出二次双侧开挖新方法,降低了土方开挖量,取消了抽排水措施,提高了施工工效,节约了施工成本。

Taking the trenching technique in the area with high water table and quicksand as the research object, a new trenching method suitable for the North Shannxi region with hydrologic feature of 1.2 m thick frozen earth in winter is explored, i.e. the secondary trenching from both sides after the primary pipeline laying down from both sides. This new method has the advantages of decreasing earthwork volume, avoiding water pumping and draining, increasing construction efficiency and saving construction cost.