| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that an anchor adhering to stable ground sometimes comes off because a shortage of a force of friction against a hole wall occurs on ground that a shortage of an area of contact with an anchoring material and a deterioration in the quality of the anchoring material are caused by the leaning of an anchor fixing body to a section below a borehole. SOLUTION: (1) A sliding extension-type anchoring body is installed in the center of the borehole by using a center lift or a hole wall friction device, so as to increase an area of contact between a resisting cross section of a front surface of the anchoring body and the hole wall. (2) When a tendon is tensioned, the sliding extension-type anchoring body moves a right-angled triangle-shaped wedge, higher on a hole bottom side, to a hole opening side, and extends a right-angled triangle-shaped pressure plate higher on the hole opening side, which is mounted on the outside of the wedge, to a hole wall side by means of the wedge, so as to pressurize the hole wall. COPYRIGHT: (C)2009,JPO&INPIT
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