| 摘要 |
PURPOSE:To efficiently perform the penetration work of drain even when the penetration depth of casing is varied by a method in which a drain is inserted into a casing and then the drain is cut off. CONSTITUTION:A casing 10 is penetrated to a given depth under soft ground 20 by means of a vibro-hammer 19, and a drain 24 with a weight 23 at its tip is inserted into the casing 10 through a drain insertion port 12 by means of a delivery roll 21. Then, the penetration length of the drain 24, corresponding to the penetration depth of the casing 10, is measured by a recorder 22, the drain 24 is cut off, compressed air is sent into the casing 10 through a compressed air supply tube 13, and then the casing 10 is drawn out. Thus, the drain 24 is pressed by soil and sand and left under the ground and only the casing 10 can thus be pulled out. |
