WALL USING PRECAST CONCRETE BUILDING MATERIAL AND CONSTRUCTION METHOD THEREFOR

A post-tensioning concrete retaining wall using a precast concrete member is provided to increase stability and constructability of a retaining wall by reducing earth pressure using a soil retaining wall, making drainage easy using a gravel bag and stabilizing a soil retaining wall using an anchor structure. A post-tensioning concrete retaining wall using a precast concrete member assembled in an installation site of a retaining wall after manufacturing a bottom and a wall coupled to the bottom with a precast method and carrying in an installation site of a retaining wall, comprises a bottom(20) installed along a slope where a retaining wall is to be installed and provided with a shear groove, a wall(10) fitted to the shear groove of the bottom, a drainpipe(30) installed on the bottom at the rear of the wall to make drainage easy after back-filling, many support bars(40) spaced out at the rear of the wall and installed on the bottom, a gravel bag(50) installed between the wall and the support bar to prevent the overturn of the wall, a soil retaining wall(60) spaced out at the rear of the wall to form an injection space of back-filling drain materials and placed to cover up a soil-fixing geosynthetic(61) to reduce earth pressure added on the wall, an anchor fixing panel(15) installed to the soil retaining wall and extended along an installation direction of the wall, a back-filling drain layer(63) placed between the wall and the soil retaining wall to drain off water of a retaining wall smoothly, and an anchor structure(70) installed from the front of the soil retaining wall to the inside of the soil retaining wall to stabilize the soil retaining wall according to the kinds of the soil. Hereon the anchor structure comprises a panel added on the inside of the soil-fixing geosynthetic and installed in the latticed type, a washer installed on the outside of the soil-fixing geosynthetic to come in contact with the panel, an anchor fixing block(71) installed to the inside of the soil retaining wall correspondingly to the panel, a geosynthetic-fixing tension member(74) fixed to the anchor fixing block and extended to the outside of the soil retaining wall by the panel and the washer, and a nut fitted to the geosynthetic-fixing tension member projected to the outside of the soil retaining wall to anchor the geosynthetic-fixing tension member on the soil retaining wall.