JPH023137Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stopper used for airtight passage tests of underground communication line conduits.

Conventionally, in airtight passage tests for underground pipelines, a stopper was used in which a cylindrical airtight rubber sandwiched between a receiving plate and a pressing plate mounted on the tip of a core shaft was expanded while being pressed by the pressing plate. Fits on both ends of the pipe,
High-pressure air is sent into the pipe through an air supply hole using a core shaft, and the pressure is measured while testing for leaks in the pipe. However, since the stopper is held in place by the frictional resistance between the airtight rubber and the inner surface of the pipe, there is a drawback that the stopper may sometimes pop out of the pipe due to the air pressure supplied into the pipe, potentially resulting in personal injury.

This invention aims to eliminate the above-mentioned drawbacks.
This is a pop-out prevention device in which a pop-out prevention plate is loosely engaged with the core shaft of the stopper so that it can be tilted and raised freely, and a stop metal fitting is fixed to the core shaft in the interval between the prevention plate and the airtight rubber, and is suitable for underground pipes. This is characterized in that it is possible to prevent the stopper from flying out when the stopper is fitted and high-pressure air is supplied.

Hereinafter, the configuration of the present invention will be explained with reference to embodiment figures.

A cylindrical airtight rubber 3 and disks 4 and 4' that are joined to the front and rear surfaces of the airtight rubber 3 are loosely fitted to the tip of a core shaft 2 with a ventilation hole 1 drilled in the center, and a nut is secured to the tip of the core shaft 2. 5 is fixed and the tube shaft 6 is inserted into the core shaft 2.
The leading end of the tube shaft 6 is joined to the disk 4', and the feed nut 7, which is screwed to the rear end of the core shaft 2, is joined to the rear end of the tube shaft 6 via a washer 8. The operating shaft 10 of the core shaft 2 is moved from the long groove 9 opened toward the side.
In the airtight passage test stopper 11 which is protruded, a stop fitting 12 having a smaller diameter than the disk 4 is fixed near the tip of the pipe shaft 6, and the upper and lower ends are fitted with the duct socket of the underground conduit or the inner surface of the duct sleeve. A long plate-shaped protrusion prevention plate 14 having an arcuate surface covered with rubber or the like and having a long hole 13 in the center that fits into the tube shaft 6 is inserted into the tube shaft 6 at a position behind the stop fitting 12. The operating chain 15 is designed to be locked to upper and lower positions of the outer surface of the anti-jumping plate 14. In addition, in the figure, 16 is an underground pipe, 17 is a duct sleeve, and 18
indicates a manhole.

Next, the effects of the present invention will be explained with reference to embodiment figures.

Duct sockets or duct sleeves 17 are fitted to both ends of the underground conduit 16 to connect the manhole 18.
It is connected to the wall of the building. When conducting an airtight passage test for the underground pipe 16, a stopper 11 is fitted to one end of the pipe, and a stopper 11 that is not bored with the ventilation hole 1 of the core shaft 2 is fitted to the other end.
1' is fitted to supply air, and the stopper 11,
11', the airtight rubber 3 at the tip, the stop fitting 12, the pop-out prevention plate 14, etc. are inserted into the conduit while tilting the protrusion prevention plate 14 using the elongated hole 13, and then the operating chain is inserted. 15 from inside the manhole to raise the protrusion prevention plate 14 and bring it into close contact with the inner end protrusion of the duct sleeve 17, and press the disc 4' while rotating the feed nut 7 to advance the tube shaft 6. The outer circumferential surface of the airtight rubber 3 which has been swollen is brought into close contact with the inner surface of the conduit under strong pressure. and,
The high-pressure hose of the compressor is connected to the joint at the rear end of the core shaft 2 of the stopper 11 on the air supply side, and the airtightness is tested while supplying high-pressure air into the pipe. The locking force is weaker than air pressure, so even if the stop fitting 12 slides into the manhole, it will be held by the protrusion prevention plate 14, and the stopper can be prevented from protruding from the inside of the pipe, and is suitable for underground pipes. This has the remarkable effects mentioned above, such as being able to prevent personal injury caused by the stoppers 11, 11' popping out during the airtightness test.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a stopper provided with a protrusion prevention plate according to an embodiment of the present invention fitted into a pipe;
The figure is a sectional view taken along the line A-A, and the third figure is the same sectional view taken along the line B-B.
Line sectional view, Fig. 4 is a sectional view taken along line C-C in Fig. 3, Fig. 5.
The figure is an explanatory diagram of the airtight passage test.

Claims (1)

[Scope of utility model registration request] A cylindrical airtight rubber 3 is loosely fitted to the tip of a core shaft 2 with a ventilation hole 1 bored in the center, and disks 4 and 4' to be joined to the front and rear surfaces of the airtight rubber 3 are loosely fitted to the tip of the core shaft. After tightening the locking nut 5, the rear end of the tube shaft 6 inserted into the core shaft 2 is pushed by the feed nut 7 screwed into the rear end of the core shaft 2, and while pressing the disk, the airtight rubber is pressed. In the stopper for the airtight passage test, which is designed to expand the tube shaft 6, a stop fitting 12 having a smaller diameter than the disk 4 is fixed at a position near the tip of the tube shaft 6, and the upper and lower surfaces are made into circular arc surfaces, and rubber is attached to the center. A long plate-shaped protrusion prevention plate 14 with a slotted hole 13 that fits into the tube shaft 6 is passed through the tube shaft 6 at the rear position of the stop fitting 12, and the protrusion prevention plate 14 is placed at upper and lower positions on the outer surface of the protrusion prevention plate 14. A protrusion prevention device for a stopper for an airtight passage test of an underground pipeline, characterized in that an operating chain 15 is locked.