| 摘要 |
<p>PURPOSE:To prevent any accident from occurring due to misjudgment of an operator by installing a shutter airtightly opening or closing a neighboring space, a drilling means and a closing means of a drill hole in a body covering the vicinity of an outer wall part of an underground pipe as interchangeably airtight to the body, and making sure of judgment for service and dormant states. CONSTITUTION:After drilling a pit, a saddle 3 is set up on a outer wall part 2 of an exposed underground pipe 1, and a body 4 is installed on top of the saddle 3 with a chain 16 and clamping means 18, 19. A drilling means 5 is airtightly attached to this body 4 free of detachment, while there is provided with a shutter plate 11 airtightly closing a space 12 in and around the outer wall part 2, and drill holes and internal threads are installed by this drilling means 5, thereby judging service and dormant states of the underground pipe 1 with a pressure gauge 8. Afterward, the holes are closed by the shutter plate 11, removing the drilling means 5, and a closing means closing the drill holes is attached thereto. Accordingly, judgment for the service and dormant states is accurately performed in a relatively easy manner and, what is more, any accident due to misjudgment of the operator is preventable.</p> |
