INNER GROOVE CUTTING DEVICE FOR CUTTING GROOVE IN INNER SURFACE OF CONCRETE HOLE

PROBLEM TO BE SOLVED: To provide a device for cutting a groove in an inner surface of a concrete hole without any noise or vibration.SOLUTION: An inner groove cutting device includes: a support member 2 connected and fixed to a rotary shaft that rotates by a motor, and having a flange at the lower end part; a bent member 4 whose one end is firmly fixed to the center of the lower surface of the support member, and which is tilted at a tilt angle α with respect to the vertical downward direction; a spring member 5 whose one end is screwed together with the other end of the bent member; a holding member 6 whose one end is screwed together with the other end of the spring member; and a cutting member 7 whose one end is screwed together with the other end of the holding member, for cutting a groove in the inner surface of a concrete hole.