Grooving device cutting device 23, I include the endless chain cutter preferably. Cutting device is attached to motor 21 to position 18 into the groove it. Prime mover can be moved on the ground of 22 above the level of the groove. If the cutting device is a chain cutter, the boom is projected downward and forward relative to the cutting direction of the grooves, the sequence of the drive means is an endless cutting element, also, is conveyed upward about the distal end of the boom the direction in which it is transported rearward along the upper run 30 of the chain cutter 23, and is adapted to drive the chain. In operation, the distal end of the chain cutter 23 is positioned against the end face of the groove at the bottom of the groove 18, so as to produce an undercut 55 in the end face 54 of the groove, the prime mover 21, the grooves while operating the chain cutter Move forward chain cutter in, to cut material from the end face of the groove, means 25 to lift the cutting device 23 upwardly through the material of the end face from the undercut raised. [Selection Figure 7
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