| 摘要 |
PURPOSE:To perform efficient excavation, by a method wherein, after a hole is excavated through connection of an intermediate screw with a head screw, intermediate screw is connected to a different head screw to excavated a hole, and such work is repeated. CONSTITUTION:2 sets of screw heads are employed, the one head being installed in a position of a first excavating hole I and the other hand being located in a position of a second excavating hole II. An excavator A is installed in a position of the excavating hole I . After an auger motor 16 is connected to a head to excavate the first excavating hole, the head is temporarily supported to a guide wall, and the head is separated from the motor 16 to laterally move the excavator A. Thereafter, an intermediate screw 7 is lifted up by means of the chain block of a working arm 22 of the excavator A to connect it to the head, and the excavator A is installed in the position of the first excavating hole agains. After the motor 16 is connected to the screw 7 and the first excavating hole is excavated by a distance equivalent to a full node of the screw, repetition of lateral movement and excavation by distance equivalent to a full node completes excavation of the first excavating hole. Further, through movement of the excavator A, a second and following excavating hole are excavated in a similar manner described above. |
