| 摘要 |
PURPOSE:To construct a rock or snow shade without causing traffic interruption by a method in which a guide rail is set in parallel with the mountain side wall for which a shade is to be constructed, and a well crane is traveled on the guide rail to lift up poles and beams for constructing shade from a truck. CONSTITUTION:Two stages of guide rails 3 and 4 are attached to the surface of the mountain side wall 2 of a road, where rock or snow shade is to be constructed. A wall crane 10 is set on the guide rails 3 and 4 in a traveling manner. The crane 10 is designed to be turned 180 deg. on road and a boom 16 is also designed to be extended or contracted. A truck 20 on which constructing parts to build a shade are loaded is stopped on nontraffic section side of the road 1, a precast pile 31 is lifted and set by the crane 10, the main beam 32 is set, and floor slabs are set on them. Shade can thus be constructed without causing traffic interruption and without use of truck crane. |
