PURPOSE: To facilitate operations for press shutting off an embedded plastic pie by providing a booster driving part provide on the side of a gate-shaped frame, a holding plate for pressing the outer surface of a plastic pipe and an operating rod extending upward for operating the gate-shaped frame.
CONSTITUTION: A hole for receiving a press shutting-off device to an embedded plastic pipe 37 is excavated from the ground surface. Next, a gate-shaped frame 30 with an operating rod 51 is lowered from the ground surface into the hole so that front and rear locating blocks 44 is adapted to abut against the upper surface of the plastic pipe 37 and mounted thereon. Under such a condition, a hydraulic pump of the ground is operated to make oil pressure act on hydraulic cylinders 34, 35, drive pistons 36, 36 of hydraulic cylinders, move left and right holding plates 38 to the central side and press shut off the plastic pipe 37 supported by a located block 44 with the left and right holding plates 38, 38. Thus, the attaching operation of the plastic pipe to press shutting-off device is simplified and a fluid shutting-off operation can be facilitated to embedded pipings with the minimum limit of excavated holes.
TSUKAMOTO YASUO
MIYAZAKI KAZUYUKI
HITACHI METALS LTD