To secure the quality of a continuous underground wall by eliminating a discontinuous portion when the continuous underground wall is formed and suppress the cost by eliminating the need of additional works by providing an excavator capable of holing the ground just beneath a buried object.
This excavator 1 excavating and holing the side wall of a shaft H from the inside of the shaft H formed in the ground G comprises an attachment 3 attached to rods 2 inserted into the shaft H and a trencher excavator 4 vertically rotatably attached to the attachment 3. In the trencher excavator 4, a drive mechanism for rotating an annular cutter chain 12 in the circumferential direction is installed on the inside of the cutter chain 12 rotated in a vertical plane.
NISHIMURA SHINICHI
KAMIMURA KAZUYOSHI
ONO KEIJI
MORI SHINOBU
SEIKO TONE KK
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
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