| 摘要 |
PURPOSE:To prevent damage to a bag body when penetrating a pile into a pit by a method in which a bag body for forming an expanded part under the ground is attached to the lower part of the pile and covered with a heat- shrinkable film. CONSTITUTION:A bag body 2 of nylon is attached to the periphery of the tip of a concrete pile 1 with the aid of adhesive and a band 3, and a vinyl chloride- based heat-shrinkable film 6 is cylindrically covered on the part fitted with the bag body 2. The pile 1 is settled into an excavated pit and cement milk is injected into the bag 2 through an injection tube 5, where the bag body 2 is expanded outwards to form an expanded part on the lower part of the pile 1. Since the bag body 2 of the pile 1 is covered with the film 6, damage to the bag body 2 when penetrating the pile 1 into the pit can be avoided.
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