| 摘要 |
PROBLEM TO BE SOLVED: To provide a boring device for concrete which can control noise generated by boring work. SOLUTION: In the boring device 1 in which a diamond bit 2 is fitted to the tip of a motor-operated drill 4 through a coolant supply attachment 6, a joining projected part 44 formed in the tip part of the attachment 6, a joining recessed part 73 which is formed in the base part of the diamond bit 2 and fitted freely attachably/detachably to the joining projected part 44, and vibration- proof members 75 and 76 set in a butt part in the axial direction between the joining projected part 44 and the joining recessed part 73 are provided.
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