| 摘要 |
PURPOSE:To shorten a working time, by a method wherein plural water permeable conctrete pipes are connected together by means of expandable joint members to form one cylinder body, and after the cylinder body is covered with a fibrous net, it is hung down into a hole. CONSTITUTION:Plural water permeable concrete pipes 1 are connected together by means of expandable joint members 2, and after its outer peripheral surface is covered with a fibroud net 3, the one end is closed with a tip cap 4 to form a drain material D. After a casing K is driven into a soft ground, the casing material K is hung down from the tip cap side for erection. Thereafter, the casing K is pulled out as filter sand is charged between the drain material D and the casing K. |
