JPH07243578A - Plugging device for pipe - Google Patents

Abstract

PURPOSE:To make air putge certainly and enhance the easiness in manipulation by furnishing a valve element operation part at the other end of a valve element operating rod, and thereby opening a through path by means of intrusion of a valve element to the tip of a column with a pressing operation of the rod. CONSTITUTION:Using a squeeze-off tool 3, gas flow is shut in a place upstream in the gas flowing direction of the place where a gas conduct pipe 1 is planned to be cut, and thereupon the gas pipe 1 is cut off. A columnar blocking tool 9 which is equipped at the tip with a male threaded part 4 and fitted with a seal ring 5 on the periphery of the tail, is inserted in revolutions from the cutting end 1b of the gas pipe 1 to a point before the squeeze-off part 1a. The squeeze-off is disengaged, and the valve mechanism of a shut-off plug 9 is turned into an open condition so that the intra-pipe air is purged, and also the valve mechanism of the shut-off plug 9 is turned to the shut-off condition. The female threaded part on the inside surface near the pipe cutting part 1b is machined off using a reamer, and a resin plug is fitted from the cut end and the joint part is fusion attached. and further a fusion attachment is made to a branch pipe so that the cut part is blocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe capping device.

[0002]

2. Description of the Related Art Conventionally, when a fluid carrying pipe such as a gas conduit is closed, as shown in FIG. 7, an air purging hole b is bored on the upstream side of the closed position of the pipe a and the air is blown. After inserting the expandable gas bag c from the purging hole b,
The gas bag c is expanded by injecting air to block the gas, and a blocking plug d is inserted from the downstream side of the pipe a to close it. After that, the air in the pipe a is purged from the air purging hole b by utilizing the pressure of the fluid generated by contracting the gas bag c, and the gas bag c is pulled out to open the air purging hole b. It was closed.

However, since the above-described capping process is complicated and time-consuming, as shown in FIG. 8, after squeeze-off on the upstream side of the pipe a, the pipe a is cut off on the downstream side and a male screw is provided around the pipe. A processing method and a blocking method in which a cylindrical blocking plug g having a portion e formed therein and having a seal ring f attached at a position different from the male screw portion e is pivotally inserted from the cut end portion of the pipe a to the front of the squeeze off portion. A stopper has been proposed.

[0004]

However, even in the above-mentioned shut-off plug, it is necessary to purge the air existing from the squeeze-off location to the shut-off plug after inserting the shut-off plug into the pipe. It is necessary to perform a complicated work such that a hole for air purging is drilled in the pipe wall from the turned-off position to the position of the shut-off plug, and the hole is closed after purging air. It is an object of the present invention to provide a tube capping device which overcomes the above mentioned drawbacks.

[0005]

In order to achieve the above object, the pipe capping device according to the present invention is characterized in that a male thread portion is formed on the outer peripheral surface of a cylindrical body and the male thread portion is formed. Fit the seal ring on the outer peripheral surface other than the location,
In the cylindrical body, a rear end side is formed with a through passage formed in a fitting recess for the operating tool along the axial direction, and a valve seat facing forward is formed in the through passage, and at the same time, in the valve seat. A close-fitting valve element is provided, and a blocking plug of a pipe in which a biasing means for pressing the valve element against the valve seat is installed, and a fitting convex part to be fitted into the fitting concave part at one end. The valve body operating rod is formed so as to be slidable in the axial direction of the operating rod for swiveling and inserting the shut-off plug into the pipe in the fitted state, and the valve body operating rod is pressed to operate the valve rod. A valve element operating portion that opens the through passage by pushing the valve element toward the tip side of the columnar body is provided with an operating tool provided at the other end portion of the operating rod.

[0006]

That is, the blocking plug of the pipe in which the through passage formed along the axial direction of the columnar body is blocked by the urging means and is in the closed state, the gas leakage is prevented by the seal ring provided on the outer peripheral surface of the columnar body. In the absence, it is swiveled into the pipe by the male screw part which is also formed on the outer peripheral surface. Then, when reaching the predetermined position, the valve body is pressed forward against the biasing force of the biasing means from the valve seat formed in the forward passage in the through passage, and the through passage is opened. , The air will be purged from the passage. The tube shutoff plug is
The operating rod, one end of which is fitted into the fitting concave portion formed on the rear end side of the through passage, is inserted into the pipe by pressing while rotating, and when it reaches a predetermined position, it slides in the axial direction of the operating rod. By pushing out the valve body operating rod that is movably fitted therein, the valve body is pushed into the tip end side of the cylindrical body and the through passage is opened.

[0007]

As described above, according to the present invention, it is possible to provide a pipe capping device with improved operability, in which air purging can be reliably carried out even if a hole for air purging is not drilled in the pipe. It was

[0008]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 2 and 5, the pipe blocking plug 9 has a male threaded portion 4 formed on the outer circumferential surface of a cylindrical body 6 and a seal ring 5 on the outer circumferential surface other than the location where the male threaded portion 4 is formed. Is externally fitted. A through passage 20 is formed in the central portion of the columnar body 6 at a rear end thereof in a fitting concave portion 21 for the operating tool along the axial direction, and
A plurality of small holes 6a are concentrically formed on the tip end surface to connect to the through passage 20, and a valve seat 22 facing forward is formed in the through passage 20 and can be closely attached to the valve seat 22. The valve seat 23 and the valve seat 23
A spring member serving as the urging means 24 for urging the urging force is internally provided.

That is, as shown in FIG. 1B, the valve element 23 is moved to the valve seat 2 by the urging force of the urging means 24.
As shown in FIG. 2A, the valve body 23 is moved toward the distal end side of the through passage 20 against the urging force of the urging means 24, as shown in FIG. It is configured to be freely switchable to an open state in which the fluid flows into the through passage 20 through the small hole 6a by being pressed and moved.

By forming the tip of the male screw portion 4 into a taper shape and forming a female screw portion on the inner peripheral surface of the gas conduit 1 made of resin, a female screw portion is formed on the inner peripheral surface of the gas conduit 1 by itself. It is configured so that it can move forward while being recessed between the male screw portion 4 and the seal ring.
To form chips, and to accommodate chips generated when the columnar body 6 is swirlingly inserted in the pipe, the chips are sandwiched between the seal ring 5 and the inner peripheral surface of the gas conduit 1, and the sealing property is improved. Is designed to avoid a drop in

Incidentally, the male screw portion 4 and the seal ring 5
Is not particularly limited, and generally, the male screw portion 4 is formed on the outer peripheral surface of the cylindrical body 6, and the seal ring 5 is externally fitted to the outer peripheral surface other than the portion where the male screw portion 4 is formed. It is sufficient that the blocking plug of the pipe is formed by forming the tip end portion of the male screw portion 4 into a taper shape and providing the rotation operation portion 21 at the rear end portion. For example, in FIG. As shown, the seal ring 5 is fitted on the outer peripheral surface of the columnar body 6 on the tip side, and the male screw portion 4 is formed on the rear end side of the columnar body 4 to taper the tip portion of the male screw portion 4. It may be formed.

As shown in FIG. 3, the operating tool 30 has a fitting convex portion 34 which is fitted in the fitting concave portion 21 at one end thereof, and is adapted to pivotally insert the shut-off plug 9 into the pipe in a fitted state. The valve body operating rod 32 is fitted into the operating rod 31 of the above so as to be slidable in its axial direction, and the valve body 23 is pushed into the tip end side of the columnar body 6 by the pressing operation of the valve body operating rod 32. A valve body operating portion 33 for opening the through passage 20 at
Is provided at the other end of the operating rod 31. The valve disc operating portion 33 has a male screw portion formed on the peripheral surface of the valve disc operating rod 32, and a female screw portion that engages with the male screw portion formed on the inner peripheral surface of the operating rod 31.
The valve body operating rod 32 includes an operating member (airtight handle) having an oval shape in side view, which is swingably attached to the end portion of the valve operating rod 32, and the operating member serves as an axial center direction of the valve operating rod 32. The tip end portion of the valve body operating rod 32 is swung in a direction intersecting with the valve body 23 to rotate.
Move in the axial direction.

The fitting recess 21 formed at the rear end of the shut-off plug 9 is a rectangular recess when viewed from the front, and has the operating rod 31.
The rectangular tip portion 31a is inserted into the concave portion and connected, and the shut-off plug 9 is pushed by rotating the operating rod 31 in a state where the gas conduit 1 and the shut-off plug 9 are aligned with each other. Rotate.

The rectangular tip portion 31 of the operating rod 31 is used.
Balls that are biased outward by springs are arranged on the four side walls of a, while small-diameter holes 21a into which the balls are fitted are formed on the inner wall surface of the recess forming the fitting recess 21 to form the ball detent mechanism 18. Is configured to prevent the operation rod 31 and the shutoff plug 9 from coming off.

A method for closing the end of the polyethylene gas conduit 1 buried in the ground will be described below.
After a construction pit (not shown) is formed around the pipe end blockage processing portion to reduce the internal pressure of the conduit 1 to a low pressure state, the procedure is performed by the procedure shown in FIGS. 1 (a) to 2 (b).

First, as shown in FIG. 1 (a), a planned cutting point is determined on the lower side of the gas conduit 1 in the gas flow direction, and the squeeze off tool 3 is located on the upper side in the gas flow direction than the planned cutting point. The flow of gas is cut off by cutting the gas conduit 1 at the planned cutting point. Here, the squeeze off tool 3 temporarily crushes the gas conduit 1 so that it can be restored by a tightening operation on the gas conduit to interrupt the flow of gas.

Next, as shown in FIG. 1 (b), a cylindrical stopper 9 having a male screw portion 4 formed around the front end side and a seal ring 5 attached around the rear end side is attached to the gas conduit 1 The squeeze-off portion 1a from the cut end portion 1b of the
Insert swivel to the front. That is, the main body of the stopper 9 advances in the pipe while the male screw portion 4 is engaged with the inner wall portion of the polyethylene gas conduit.

After that, as shown in FIG. 2 (a), the squeeze-off is released, and the valve mechanism of the shutoff plug 9 is opened to purge the air in the pipe. Operate the valve mechanism to the shut-off state. As shown in FIG. 2B, the female screw portion formed on the inner peripheral surface in the vicinity of the cut end portion 1b of the pipe is removed using a reamer, and the resinous plug plug 7 is inserted from the cut end portion 2c. And fuse the joints,
Alternatively, the closing cap 8 is externally fitted to the cut end portion 2c and is fused to the branch pipe 2 to close the cut portion. Then, the squeeze-off tool 3 and the like are taken out of the construction pit, and then the construction pit is backfilled to complete the closing process.

That is, the pipe capping device comprises the shut-off plug 9 and the operating tool 30, and the operating tool 10 used as an auxiliary when capping the end of the pipe by using them will be described below. As shown in FIGS. 3 and 4, the operating tool 30 includes a radially divided outer holding body 11 and 12 that can hold the gas conduit 1, and a retaining member inside the outer holding body 11 and 12. The cylindrical body 14 is provided with a locking portion 14a to be stopped, and at the end thereof, a cylindrical main body 14 having an insertion hole 14b for externally fitting the holding member 13 is formed. The operating rod 31 can be inserted into the through hole 13a so as to reciprocate in the axial direction.

Each of the outer holding bodies 11 and 12 has a shape in which a short, substantially cylindrical body which can be fitted onto the branch pipe 2 is radially divided into two parts, and they are arranged in an integrated state before the division. One of the facing portions of the above is pivotally connected by a pivot member 16, and the other is releasably fastened by a fastener 17, and on the rear end side of the one outer sandwiching body 11, A cock mechanism 19 for degassing is formed. The outer clamp 1 is released by releasing the fastening by the fastener 17.
After opening the outer clamps 1 and 12 and closing the outer clamps 11 and 12 so as to be fitted on the gas conduit 1, the fasteners 17 are fastened to each other, whereby the outer clamps 1 and 12 are closed.
1, 12 can hold and hold the gas conduit 1.

After the tubular main body 14 is externally fitted from the cut end portion of the gas conduit 1, the outer holding bodies 11 and 12 are used to
The gas conduit 2 is held and held from above so that the external fitting portions of the cylindrical main body 14 overlap with each other, and the outer sandwiching bodies 11, 1 are held.
The engagement portions 11a and 12a formed on the inner surface of 2 are engaged with the locking portion 14a to prevent the tubular main body 14 from coming off.

In this way, after the above-mentioned shut-off plug 9 is inserted into the gas conduit 1, the valve mechanism in the shut-off plug 9 is operated to purge the gas to the outside via the cock mechanism 19. It is discharged.

In the above-mentioned embodiment, as a pipe blocking plug,
Although what is used for the pipe end blockage processing method of the fluid conveying main pipe 1 which is a polyethylene gas conduit has been described, the use object of the pipe capping device is not limited to this, and other than the polyethylene gas conduit. It may be used to shut off a resin pipe. Further, it is not limited to the one used for the gas conduit, it can be applied to other fluid carrying pipes, and the pipe type is also used for a metal pipe such as a cast pipe in which an internal thread is previously formed on the inner wall portion. You can also

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for treating the end of a polyethylene pipe.

FIG. 2 is an explanatory view of a method for treating the end of a polyethylene pipe.

FIG. 3 is a vertical cross-sectional view of a pipe capping device.

FIG. 4 is a cross-sectional view of the main part

FIG. 5 is a side view of the main part.

FIG. 6 is a vertical cross-sectional view of a blocking plug showing another embodiment.

FIG. 7 is an explanatory view of a pipe end blockage processing method showing a conventional example.

FIG. 8 is a vertical cross-sectional view of a blocking plug showing a conventional example.

[Explanation of symbols]

 4 Male screw part 5 Seal ring 6 Cylindrical body 20 Through passage 21 Fitting concave part 22 Valve seat 23 Valve body 24 Energizing means 31 Operation rod 32 Valve body operating rod 33 Valve body operating part 34 Fitting convex part

Claims (1)

[Claims] 1. A male screw part (4) is provided on the outer peripheral surface of a cylindrical body (6).
And a seal ring (5) is externally fitted to the outer peripheral surface other than the portion where the male screw part (4) is formed.
The through passage (20) formed in 1) is formed along the axial direction, and the valve seat (2) facing forward is provided in the through passage (20).
2) and a valve body (23) that is intimately attached to the valve seat (22) and is configured to urge the valve body (23) against the valve seat (22). And a fitting stopper (34) for fitting into the fitting recess (21) are formed at one end, and the blocking plug is inserted into the tube by swiveling. A valve disc operating rod (32) is fitted in the operating rod (31) slidably in the axial direction, and the valve disc (23) is pushed into the cylindrical body by pressing the valve disc operating rod (32). (6) A valve element operating part (33) for opening the through passage (20) by pushing the operating part provided at the other end of the operating rod (32). Capping device.