| 摘要 |
PURPOSE: A ground pressure type anchor using double reaming is provided to prevent a reduction of tensile force of an anchor and to improve anchorage of the anchor by installing a ground pressure type anchor after forming a plurality of expansion holes and a plurality of excavation portions during underground constructions. CONSTITUTION: A ground pressure type anchor using double reaming comprises a step of boring a first excavation portion by boring an inclined ground with an excavating bit in order to install an anchor; a step of forming a first expansion hole portion by rotating a big wing of the excavating bit in reverse; a step of removing the excavating bit and a shaft after boring a second expansion hole portion; a step of installing the anchor(30) in the first expansion hole portion and the second expansion hole portion; and a step of grouting(300) from the first expansion hole portion to the second expansion hole portion by injecting cement or mortar with a steel bar wrench case after separating a steel bar wrench; a step of fixing the anchor by fixing a tension wire(37) of the anchor to the outer surface of a steel beam after separating the steel bar wrench case and curing the grouting. |
