大型空心混凝土桩的施工方法:首先,在地下钻一孔洞①,用膨润土溶液罐满,然后配置钢筋@、。在孔洞中放进白铁皮作的内壳③。此时为防止内壳不被孔洞内的澎润土溶液②的水压所破坏,在内壳底板上设有通水孔。然后,在内壳中放一个与内壳大小同等的乙烯树脂袋⑤。把盖子④固定在钢 Construction methods for large hollow concrete piles: First, drill a hole 1 in the underground and fill it with a solution of bentonite, then configure the steel bars. The inner shell 3 made of tin plate is placed in the hole. In order to prevent the inner shell from being damaged by the water pressure of the bentonite solution 2 in the hole, a water hole is provided in the bottom plate of the inner shell. Then, a vinyl bag 5 having the same size as the inner shell was placed in the inner shell. Fix the cover 4 on the steel