| 摘要 |
PROBLEM TO BE SOLVED: To achieve correct positioning by moving a truck between drilling positions is a short time without largely moving the truck. SOLUTION: In a down-the-hole drill 10 to support a mast furnished with a down-the-hole hammer 14 on a track 13 provided with front and rear wheels 11, 12, the front and rear wheels 11, 12 of the truck 13 are steerable, respectively. An operator cabin 16 is arranged forward of the truck 13, and a traveling operation device and a drilling operation device are provided in the operator cabin 16.
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