| 摘要 |
PURPOSE:To provide a temporary anchor which is easy to removal, by a method wherein plural rigid cylinder bodies are combined together by means of a hinge to form a link which can be bent and restored to a straight condition, and a hydraulic cylinder plunger device is located between the links. CONSTITUTION:Plural rigid cylinder bodies 2 and linked by means of a hinge to form a rigid cylinder body link 1 which can be bent and restored to a straight state. A hydraulic cylinder plunger device 5 is mounted to each hinge-linked part, and a space between the rigid cylinder bodies 2 is blocked with a bellows 4 to form a temporary anchor. In order to install the temporary anchor, a hole 7 having size slightly larger than that of the rigid cylinder body 2 is excavated. After a rigid cylinder body link 1 is inserted into the hole 7 in a straight condition, with the hydraulic cylinder plunger device 5 actuated, the rigid cylinder body link 1 is curved. Further, in order to remove the temporary anchor, with the hydraulic cylinder plunger device 5 actuated, the rigid cylinder body link 1 is forced into a straight state, and this enables easy removal of the temporary anchor. |
