| 摘要 |
PURPOSE:To reduce the extent of frictional resistance by forming a high water absorbent resinoid part containing clay and a water-soluble high molecular compound inside. CONSTITUTION:Resin contained with clay and one type of more than two types of a water-soluble high molecualr compound such as polyacrylic acid soda or the like enveloped in a molecule of high water absorbent resin, is adjusted, thereby forming a skid for a jacking method. Next, this skid is pressed in an interval between a driving pipe of this jacking method, thrusting this driving pipe forward successively as driving a facing, and natural ground. In succession, the skid absorbs water into gellation, and a water molecule is hydrated with a molecule constituting gel and kept in this gel. With this constitution, such a possibility that the skid might be absorbed and thereby its effect be thinned or this effect is lost because of dilution or flowing out is brought to nothing, and frictional resistance in the driving pipe is reducible. |
