| 摘要 |
PURPOSE:To eliminate the need for a sheathing work and a temporary construction work and to shorten a construction period, by a method wherein a cylinder is inserted into a pit for arrangement, a tension material inserted into the cylinder, and after concrete is placed as the cylinder is pulled out, the tension material is anchored after a tension force is applied to the tension material. CONSTITUTION:A cylinder A is inserted into a circular pit (h), crushed stone 1 is charged into the cylinder A to tamp it by a hanging hammer 2, and a tension steel rod 3 is inserted to keep it in a standing conditin. Operations to pull the cylinder A out of the pit (h) and operations to pour concrete into the pit (h) through a pipe P are carried out as occasion demands, and concrete in the each pit (h) is monolithically cured in a continuous manner to form an under ground wall body B. A hydraulic jack C grasps the end of the steel rod 3 to apply a tension force to the steel rod 3, and it is then anchored. This enables keeping of a concrete wall in a compression state. |
