| 摘要 |
PURPOSE:To prevent the occurrence of cracks by a method in which a cylindrical reinforcement is set concentrically with a tension member in anchor mortar constituting the fixing portion of a permanent anchor so that the extension of the anchor mortar is suppressed by the reinforcement and the elongation amount is also lessened. CONSTITUTION:In the fixing portion 1b of anchor, a cylindrical reinforcing material 5 is set to surround partly the fixing portion 2b and free length portion 2a of a tension member 2. The material 5 is made of iron or steel and is designed to prevent the separation of the upper and lower parts by shearing resistance by providing strip-shaped holes for the upper and lower parts and by integrating the holes by inner and outer anchor mortars 3. The tension of the member 2 and tensile stress generated by friction with the ground in the fixing portion 1b are absorbed by the material 5 having a great tensile stress to lessen the elongation in them. The breakage of anchors can thus be prevented by a simplified constitution.
|
