JP2000266274A - Pipe end closing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a pipe end closing device capable of reliably maintaining a cut portion of a steel pipe such as city gas in a closed state. SOLUTION: A cylindrical main body 20 having a closed bottom 21 is provided.
At the opening end, there is provided a connecting portion 22 for connection with the pressing ring, and a central portion thereof has a diaphragm portion 23. The squeezing portion 23 is configured such that the pipe end 11 of the squeezed steel pipe 10 can be passed only in a predetermined direction. After inserting a cylindrical main body into the squeezed pipe end 11, a flexible packing 40 and a retainer 50 are fitted into the opening of the main body, and a cap nut 30 as a push ring is tightened. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end closing device capable of burying or leaving a buried steel pipe of city gas or the like in a closed state by squeezing the end thereof.

[0002]

2. Description of the Related Art In order to close an end of a steel pipe buried in a pipe, a method of connecting a mechanical cap joint made of metal to the cut end of the pipe after cutting the steel pipe in the closed part, and a method of closing the upper and lower parts of the outer peripheral surface of the pipe. A method of squeezing the pipe from the direction with a squeezing tool and crushing the pipe flat to close it is adopted.

[0003] Squeezing and closing a pipe is convenient because it can be performed without causing gas to flow out even when gas is flowing through the pipe. However, there is no way to reliably maintain the closed state of the tube after the squeeze flattening. Was taken.

[0004]

In the prior art, the closing operation to be performed on the pipe end is not always uniform due to manual operation, and the operation such as wrapping a rubber cap or tape is complicated, and protection is difficult. There was a problem that it was insufficient and the closed state could not be reliably maintained.

An object of the present invention is to solve the above-mentioned problems and to provide a pipe end closing device capable of maintaining a cut portion of a steel pipe of city gas or the like in a closed state.

[0006]

SUMMARY OF THE INVENTION A pipe end closing device according to the present invention is a cylindrical body capable of receiving a pipe end of a squeezed steel pipe, the one end of which has a closed bottom at one end. One having a connection portion with a push ring at an end, a flexible packing for sealing the outer peripheral surface of the received steel pipe and the inner surface of the cylindrical main body, and a connection portion with the push ring at the other end And a press ring for holding the flexible packing.

In the above tube end closing device, the cylindrical body has, at an intermediate portion in a longitudinal direction thereof, a throttle portion through which a tube end of a squeezed steel pipe can be passed only when the tube end is in a certain direction with respect to the body. Preferably, the flexible packing seals the outer peripheral surface of the received steel pipe and the inner surface on the other end side of the main body.

In the above pipe end closing device, the narrowed portion of the cylindrical main body has an inner diameter surface through which the cylindrical portion of the steel pipe can pass and the squeezed pipe end is locked, and a through hole through which the squeezed pipe end can pass. It is preferable to have.

It is preferable that a retainer is mounted between the flexible packing and the cap nut.

It is preferable that the retainer used in the present invention is divided into at least two parts at the axial surface of the main body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a pipe end closing device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a state in which a pipe end closing device according to an embodiment of the present invention is mounted on a pipe end of a steel pipe. The upper half shows a longitudinal sectional view, and the lower half shows a transverse sectional view.
FIG. 2 is a cross-sectional view showing the throttle unit 23 of FIG. FIG. 3 is a plan view (A), a longitudinal sectional view (B), and a flexible packing used in the pipe end closing device according to one embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a retainer used in the pipe end closing device of the present invention. FIG. 5 is a longitudinal sectional view showing a part of a pipe end closing device according to another embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a steel pipe, and a pipe end 11 is squeezed and flattened. Reference numeral 20 denotes a cylindrical main body, which has a closed bottom 21 at one end and a screw 22 as a connection portion with a push ring at the other end. The flexible packing 40 has a seal through hole 41 at the center thereof to seal the outer peripheral surface of the steel pipe 10 and the inner surface of the cylindrical main body. The cap nut 30 is an embodiment of a push ring, and has a hole 31 through which the squeezed pipe end 11 passes at the center of the lid, and has a screw 32. It is adapted to be attached to the screw 22 of the cylindrical body 20 by means of a screw 32 so as to hold the flexible packing 40. Instead of the cap nut 30, any connection may be used as long as it is connected to the cylindrical main body 20, and may be bolt connection using a flange or the like.

A cap nut 30 and a packing 40 are attached to the squeezed pipe end 11 of the steel pipe 10 from the pipe end 11.
Next, the cylindrical body of the tube end closing device is mounted from the tube end 11, and in this state, the flexible packing 40 is fastened to the cylindrical body 20 with the cap nut 30, so that the gas from the squeezed tube end 11 is removed. Such leakage can be completely stopped. The retainer 50 includes the packing 40 and the cap nut 3.
0 is attached from outside the steel pipe 10.

The cylindrical main body 20 preferably has a narrowed portion 23 at an intermediate portion in the longitudinal direction. This throttle section 23
Has a flat through-hole 24 so that it can be passed only in a certain direction with respect to the pipe end 11 of the squeezed steel pipe 10. The constricted portion has an inner diameter surface through which the cylindrical portion of the steel pipe 10 can pass and the squeezed pipe end 11 is locked, and a through hole 24 through which the squeezed pipe end 11 can pass only in a certain direction. have. By having this narrowed portion 23, the flexible packing 40
It is preferable that the flexible packing 40 also has a tapered surface 42 so that the flexible packing 40 is placed on the inner surface 25 of the main body 20 of the throttle unit 23 having the screw 22, that is, on the tapered surface.
By providing the flexible packing 40 with the tapered surface 42, the packing 40 is pressed in the depth direction of the cylindrical main body 20, and the seal through hole 41 of the flexible packing 40 is formed on the outer peripheral surface of the steel pipe 10. While being strongly pressed, the tapered surface 42 is strongly pressed against the inner surface 25 of the narrowed portion of the main body 10, so that the space therebetween is sealed.

Preferably, a retainer 50 is interposed between the flexible packing 40 and the cap nut 30. Retainer 5
0, the cap nut 30 is inserted into the cylindrical main body 2.
When the screw is rotated with respect to 0 and screwed in, the collar (cover) of the cap nut 30 is easily turned with respect to the flexible packing 40, so that the cap nut 30 is easily tightened, and the flexibility is improved. The packing 40 is not damaged by twisting. The retainer 50 has a length of at least two as shown in a longitudinal sectional view in FIG.
It is preferable that the main body is divided into individual pieces by the axial surface of the main body. By using the retainer 50 divided into at least two parts, the retainer 50 can be attached from the outside of the steel pipe 10 even after the cylindrical main body 20 is attached to the pipe end 11.

In FIGS. 1 and 3, a flexible packing 40 having a trapezoidal cross section is used. However, as in another embodiment shown in FIG. 5, a flexible packing 4 having an O-ring shape having a round cross section is used.
0 'can also be used. A commercially available O-ring-shaped flexible packing 40 'can be used. In this case, the packing 40 ′ has an outer diameter in contact with the inner surface of the taper having a larger diameter than the through hole 24.

When closing the tube end of the live tube with the tube end closing device of the present invention, a portion of the tube in the live tube state is squeezed to squeeze in a state where leakage of gas or the like from the live tube is reduced. Is cut and the pipe end closing device is attached, so that a large amount of gas or the like does not leak at the time of attachment, and an accident at the time of attachment work can be eliminated.

The mounting operation of the pipe end closing device will now be described. First, squeeze and close the steel pipe to be closed,
Cut off the skived end. Thereafter, the cylindrical end of the tube end closing device is placed over the squeezed end of the tube, and the end of the tube is inserted into the cylindrical main body through the narrowed portion of the main body. The squeezed portion is designed to pass only when the squeezed and crushed tube end is facing in a certain direction, so by rotating the cylindrical body a little around the tube axis, the tube end can be squeezed. The main body is not easily detached from the tube by locking to the pipe, and it is safe even when left for a long time. Next, the flexible packing is held up to the tapered surface of the drawing portion, the retainer is attached to the end of the packing, and the cap nut is screwed into the cylindrical main body. Thus, the pipe end closing device of the present invention is attached to the pipe end, and the pipe end is closed.

As described above, since the squeezed portion passes only when the squeezed and crushed pipe end faces in a certain direction, after the pipe end passes through the squeezed portion, If the cylindrical body is slightly rotated, the squeezed and widened portion of the tube end will be caught by the constricted portion, and the cylindrical body will not come off from the tube end, thereby ensuring safety from mischief and other external environments.

[0020]

As described above in detail, the pipe end closing device of the present invention prevents the pipe end from slipping out of the pipe end and has high safety against leakage and ensures the pipe end after squeezing. It can be kept closed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a pipe end closing device according to an embodiment of the present invention is mounted on a pipe end, wherein an upper half is a longitudinal sectional view and a lower half is a transverse sectional view.

FIG. 2 is a cross-sectional view showing the throttle unit 23 of FIG. 1 in the pipe end closing device according to one embodiment of the present invention.

FIG. 3 is a plan view (A) and a longitudinal sectional view (B) of a flexible packing used in the pipe end closing device according to one embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a retainer used in the pipe end closing device of the present invention.

FIG. 5 is a longitudinal sectional view showing a part of a pipe end closing device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel pipe 11 Pipe end part 20 Cylindrical main body 21 Bottom 22 Screw (connection part with a press ring) 23 Restricted part 24 Through hole 25 Inner surface 30 Cap nut 31 Hole 32 Screw 40, 40 'Flexible packing 41 Seal through hole 42 Tapered surface 50 Retainer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chiaki Tsutsumi 2 Daifuku, Kuwana-shi, Mie Inside the Kuwana Plant of Hitachi Metals, Ltd. (72) Inventor Takashi Kanai 1-17-10 Minami 1-chome, Ushiku-shi, Ibaraki Inventor Shinobu Satake 330 Inuma-cho, Hachioji-shi, Tokyo 13F F-term (reference) 3H025 DA01 DB22 DC02 DD11

Claims (3)

[Claims] 1. A cylindrical body capable of receiving a pipe end of a squeezed steel pipe, having a sealed bottom at one end and a connection portion with a press ring at the other end. A flexible packing for sealing the outer peripheral surface of the received steel pipe and the inner surface of the cylindrical main body, and a push for holding the flexible packing attached to a connecting portion between the push ring at the other end. A pipe end closing device having a ring. 2. In a longitudinally intermediate portion of the cylindrical body,
The squeezed steel pipe has a narrowed portion that can be passed only when it is in a certain direction with respect to the pipe end, and the flexible packing has an outer peripheral surface of a received steel pipe and the other end side of the main body. The pipe end closing device according to claim 1, wherein the device seals the inner surface. 3. The narrowed portion of the cylindrical body has an inner diameter surface through which a cylindrical portion of a steel pipe can pass and a squeezed pipe end is locked.
3. The pipe end closing device according to claim 2, further comprising a through hole through which the squeezed pipe end can pass.