沉管灌注桩的优点是有效地防止塌孔并能避免钻孔灌注桩的泥浆处理 ;其缺点是沉管过程中大量挤土 ,沉管阻力较大 ,对周围环境造成不利影响。空气幕沉管、干法取土灌注桩这种新的施工工艺是通过套管内取土 ,套管外设空气幕来减少沉管阻力。作者通过三组对比试验证明了这两种方法的减阻效果是很明显的 ,这样就可以实现用小的桩工机械将套管沉到较大深度。试验的结果可以为新工艺的施工机械提供设计数据 The advantage of immersed pipe pouring pile is to effectively prevent collapsible holes and to avoid the mud treatment of bored piles. The disadvantage is that a large amount of soil is squeezed during immersion pipe and the resistance of immersed pipe is large, which adversely affects the surrounding environment. Air curtain immersed pipe, dry earth piles This new construction technology is to take soil through the casing, casing air curtain to reduce the outer tube resistance. The authors demonstrate through three sets of comparative tests that the drag reduction effect of these two methods is evident so that it is possible to sink the casing to a larger depth with a small pile-forming machine. The result of the test can provide design data for the construction machinery of the new process