| 摘要 |
PURPOSE:To make easier the drawing of PC steel wires by a method in which a hollow pipe is set along PC wires when earth anchors are set, cement mortar is placed, and when the anchors are removed, cement mortar is broken by injecting an expandible material into the hollow pipe. CONSTITUTION:When inserting PC steel wires 13 into an excavated pit 4 when earth anchors are set, plural pipes 14 to form a cavity inside the anchors are set along the PC steel wires 13 and then usual anchoring work is executed to support sheet piles 6, etc. After the sheet piles 6, etc., are supported by the anchors, an expandible material 15 based on lime stone or calcium sulfoaluminate is injected into the pipe 14 to break the cement mortar 5 surrounding the PC steel wires 13 by the pressure of the expandible material 15 when removing the anchors and the PC steel wires 13 are pulled out. |
