JP4295854B2 - Tube end occlusion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube end closing device which can be embedded or left in a state where an end portion of an embedded steel pipe such as city gas is closed by squeezing .
[0002]
[Prior art]
In order to close the end of the buried steel pipe, after cutting the closed steel pipe, a method of connecting a metallic mechanical cap joint to the cut pipe end, or by using a squeeze tool from the top and bottom of the pipe outer peripheral surface A method of squeezing and crushing the tube flatly to close it is adopted.
[0003]
Squeezing and closing the tube is convenient because it can be performed without flowing the gas outside even when the gas is circulating in the tube. However, there is nothing to reliably maintain the closed state of the tube after squeeze flattening, such as removing the squeeze tool and covering the end of the squeeze tube with a rubber cap containing butyl rubber and winding the tape around the outer surface Was taken.
[0004]
[Problems to be solved by the invention]
In the conventional technology, the clogging work applied to the pipe end is not always uniform due to manual work, and the work such as rubber cap and tape winding is complicated and insufficient protection is ensured. There was a problem that it could not be maintained.
[0005]
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 place where a steel pipe made of city gas or the like is cut off.
[0006]
[Means for Solving the Problems]
Tube end closure device of the present invention has a sealed bottom at one end, together with having the other end a connection portion, a cylindrical Body which can accept the tube ends of the squeeze the steel pipe from the other end,
A flexible packing that seals between the outer peripheral surface of the received steel pipe and the inner surface of the cylindrical body;
In what has a push ring attached to the connecting portion of the cylindrical main body, holding the flexible packing and pressing it against the back of the cylindrical main body ,
The cylindrical main body has a narrowed portion that can be passed only when it is in a certain direction with respect to the pipe end of the squeezed steel pipe .
[0007]
In the pipe end closure device, prior Symbol flexible packing, it is preferable that the sealing between the other end of the inner surface of the receiving outer peripheral surface and a cylindrical body of steel pipes that are placed.
[0008]
In the tube end closing device, the throttle 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 tube end engages, and a through hole through which the squeezed tube end can pass. It is preferable.
[0009]
It is preferable that the retainer is attached between flexible packing and press wheels.
[0010]
In addition, the retainer used in the present invention is preferably divided into at least two on the axial surface of the main body.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a tube end closing device of the present invention will be described in detail with reference to the drawings. Figure 1 is a view to vertical cross-sectional view a state of mounting the pipe end closure device of one embodiment in the pipe end portion of the steel pipe of the present invention. FIG. 2 is a cross-sectional view showing the throttle portion 23 of FIG. FIG. 3 shows a flexible packing used in the tube end closing device according to one embodiment of the present invention, and FIG. 4 is a plan view (A) and a longitudinal sectional view (B) thereof, and FIG. It is a longitudinal cross-sectional view of the retainer used. FIG. 5 is a longitudinal sectional view showing a part of a tube end closing device according to another embodiment of the present invention.
[0012]
In the figure, 10 is a steel pipe, and its pipe end 11 is squeezed and flattened. Reference numeral 20 denotes a cylindrical main body having a sealed bottom 21 at one end and a screw 22 as a connecting portion with a push ring at the other end. The flexible packing 40 has a seal through hole 41 at the center thereof, and seals between the outer peripheral surface of the steel pipe 10 and the inner surface of the cylindrical main body. Here and cap nut 30 is used as the wheel press, along with the hole 31 tube end 11 of the steel pipe and squeeze to the lid center passes, have a screw 32, the cylindrical body 20 by screws 32 It is adapted to be attached to a connection or screw 22 to hold the flexible packing 40. As long as it is connected to the circular cylindrical body 20 instead of the cap nut 30, but it may be a bolt connection flange or the like.
[0013]
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 main body of the pipe end closing device is mounted from the pipe end portion 11, and in this state, the flexible packing 40 is fastened to the cylindrical main body 20 with the cap nut 30, whereby the gas from the squeezed pipe end portion 11 is obtained. It is possible to completely stop leakage. The retainer 50 is mounted between the packing 40 and the cap nut 30 from the outside of the steel pipe 10.
[0014]
Cylindrical body 20 that has the throttle portion 23 in the longitudinal direction intermediate portion. The throttle portion 23 has a flat through-hole 24 so that it can pass only when it is in a certain direction with respect to the pipe end portion 11 of the squeezed steel pipe 10. The throttle portion 23 has an inner diameter surface through which the cylindrical portion of the steel pipe 10 can pass and the squeezed tube end portion 11 is locked, and the squeezed tube end portion 11 can pass only in a certain direction. have. By having the throttle portion 23, the flexible packing 40 is placed on the inner surface 25 of the throttle portion 23 on the side having the screw 22, that is, the tapered surface, so that the flexible packing 40 also has the tapered surface 42. It is preferable to have By providing the flexible packing 40 with the tapered surface 42, the seal through hole 41 of the flexible packing 40 is brought into contact with the outer peripheral surface of the steel pipe 10 by pressing the packing 40 toward the back of the cylindrical main body 20. In addition to being strongly pressed, the tapered surface 42 is strongly pressed against the inner surface 25 of the throttle portion of the main body 20 , so that the space between them is sealed.
[0015]
It is preferable to interpose a retainer 50 between the flexible packing 40 and the cap nut 30. By inserting the retainer 50, when the cap nut 30 is rotated and screwed into the cylindrical main body 20, the collar portion (lid portion) of the cap nut 30 is easily turned with respect to the flexible packing 40. Therefore, the cap nut 30 is easily tightened, and the flexible packing 40 is not twisted and damaged. The retainer 50 is preferably divided into at least two parts on the axial surface of the main body as shown in the longitudinal sectional view of FIG. 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 mounted on the pipe end portion 11.
[0016]
1 and 3, a flexible packing 40 having a trapezoidal cross section is used, but an O-ring shaped flexible packing 40 'having a round cross section may be used as in another embodiment shown in FIG. it can. A commercially available O-ring shaped flexible packing 40 'can be used. In this case, the packing 40 ′ has an outer diameter that contacts the inner surface of the taper having a larger diameter than the through hole 24.
[0017]
When the tube end portion of the live tube is closed with the tube end closing device of the present invention, the squeezed end is cut while squeezing a part of the live tube and reducing leakage of gas from the live tube. Since the pipe end closing device is attached, there is no possibility that a large amount of gas leaks at the time of installation, and an accident at the time of installation can be eliminated.
[0018]
The operation of attaching the tube end closing device will now be described. First, the steel pipe to be closed is squeezed and closed, and then the squeezed end is cut. Thereafter, the squeezed tube end is covered with the cylindrical main body of the tube end closing device, and the tube end is inserted into the cylindrical main body through the throttle portion of the main body. Since the throttle part passes only when the squeezed and crushed pipe end is in a certain direction, the pipe end can be turned by slightly rotating the cylindrical body around the pipe axis. The main body is not easily detached from the tube by being locked in, and it is safe even when left for a long time. Next, the flexible packing is held to the tapered surface of the throttle portion, the retainer is attached to the end of the packing, and the cap nut is screwed into the cylindrical body. In this way, the tube end closing device of the present invention is attached to the tube end portion to close the tube end portion.
[0019]
As explained above, the throttle part passes only when the squeezed and crushed pipe end is in a certain direction, so after the pipe end passes through the throttle part, the cylindrical body When the is slightly turned, the squeezed and widened portion of the tube end is caught by the throttle portion, and the cylindrical main body does not come out from the tube end, so that it is safe from mischievous and other external environments.
[0020]
【The invention's effect】
As described above in detail, the tube end closing device of the present invention is prevented from coming out of the tube end portion, and is highly safe against leakage and can reliably maintain the tube end portion after squeezing. It can be done.
[Brief description of the drawings]
1 is a view to vertical cross-sectional view a state mounted on the tube end of the tube end closure device of an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the throttle portion 23 of FIG. 1 in the tube end closing device of 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 tube end closing device according to the embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a retainer used in the tube end closing device of the present invention.
FIG. 5 is a longitudinal sectional view showing a part of a tube end closing device according to another embodiment of the present invention.

Claims (3)

It has a closed bottom at one end, together with having the other end a connection portion, a cylindrical Body which can accept the tube ends of the squeeze the steel pipe from the other end,
A flexible packing that seals between the outer peripheral surface of the received steel pipe and the inner surface of the cylindrical body;
In the tube end closing device, which is attached to the connecting portion of the cylindrical main body and has a push ring that holds the flexible packing and presses it against the back of the cylindrical main body .
A tube end closing device characterized by having a throttle part which can pass only when it is in a certain direction with respect to a pipe end part of a squeezed steel pipe in a longitudinal direction middle part of the cylindrical main body . Before Symbol flexible packing, acceptance was Der Ru請 Motomeko 1 tube end closure device according intended to seal between the inner surface of the other end of the outer peripheral surface and the cylindrical body of steel. The narrowed portion of the circular cylindrical body, the pipe end cylindrical portion of the steel pipe has squeeze can pass through the inner diameter surface for engaging, squeeze the tube end is 請 Motomeko 2 wherein that have a hole that can pass Tube end occlusion device.

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