PURPOSE:To promote the efficiency and safety of excavation work by mounting tables on guide rails constructed spirally along the internal surface of a shaft so that they are capable of sliding, and mounting an excavator capable of shaking a head and expansion on them to form an excavating device. CONSTITUTION:Shorting members 2 are constructed to the internal surface of a shaft, and guide rails 1 are so constructed that it has about three full circles spiral. After that, sliding tables 3 are loaded to the guide rails 1 to mount an excavator 5. Then, the excavator 5 capable of shaking a head in up and down and horizontal directions by two jacks 53 excavates the whole section of the shaft by circling two stages of up and down guide rails 1 with them as the reaction force. The guide rails 1 are successively removed from above in accordance with the advancement of excavation to make re-shoring of them downward, and excavated earth is discharged by movement of an earth loading device 6 mounted on the guide rails 1. According to the constitution, excavation efficiency is promoted, and a construction period can be reduced.
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