JPH06241374A - Branch pipe connection joint - Google Patents

Abstract

PURPOSE:To prevent fluid from leaking from a branch pipe connection joint and fix it securely to a main pipe irrespective of the bore of the main pipe. CONSTITUTION:A pair of saddles 4A and 4B are fixed to a main pipe 1 by using a tightening member 5, and a cylindrical branch pipe connecting pedestal 6 is mounted on one side saddle 4A. Also a cylindrical support body 7 is screwed into a screw hole 63 in the pedestal 6, and a seal member 8 is compressed in axial direction by the flange part 73 of the cylindrical support body 7 and the protruded part 64 of the pedestal 6 so as to swell the seal member 8 in radial direction. Thus the seal member 8 is closely stuck to the wall surface of a through-hole 12 on the main pipe 1 side so as to exhibit sealing effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe connecting joint for connecting a branch pipe to a main pipe such as a gas pipe.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, when a branch pipe (not shown) is connected to the main pipe 1, a branch pipe connecting joint 3 is provided with a screw hole 2 formed in the main pipe 1. Male screw 3a
This joint 3 was screwed to connect the joint 3 to the main pipe 1 in a branched manner, and the branch pipe was connected to the branch pipe connection port 3b of the joint 3.

[0003]

In the conventional branch pipe connection joint, the smaller the diameter of the main pipe 1, the smaller the curvature of the main pipe 1, and the number of effective threads of the screw hole 2 on the main pipe 1 side. Since the number of threads decreases, the screw hole 2 on the main pipe 1 side and the male screw 3 on the joint 3 side
It becomes difficult to secure a sufficient screwing amount with a, and there is a possibility that fluid such as gas flowing in the main pipe 1 may leak to the outside from a portion with a small screwing amount. There was a tendency that it became difficult to attach it securely to the.

On the other hand, recently, there has been developed a technique for extending the life of the aged pipe by additionally forming a lining layer on the inner surface of the aged pipe with a hard vinyl chloride resin or the like. However, such a lining layer is formed. When a branch pipe is connected to the pipe, a threaded hole (corresponding to the threaded hole 2 in FIG. 5) is formed in the tube, so that a gap is formed between the wall of the tube and the lining layer at the location where the threaded hole is formed. Often occurs, and in some cases,
When a branch pipe is connected using a joint and a fluid is caused to flow in the pipe, the fluid may enter the gap between the pipe wall and the lining layer and impair the life extension of the pipe due to the formation of the lining layer.

The present invention has been made in view of the above circumstances, and even if the main pipe has a small diameter, it is possible to surely prevent fluid leakage from the mounting location of the branch pipe connection joint and at the same time, It is possible to securely and firmly attach the branch pipe connection joint to a pipe, and even if the main pipe is a pipe whose inner surface is lined, the pipe wall and the lining layer are not separated from the attachment point of the branch pipe connection joint. It is an object of the present invention to provide a branch pipe connection joint capable of eliminating the possibility that a fluid flowing through a main pipe will enter a gap between them.

[0006]

In order to achieve the above object, the present invention provides a pair of saddles arranged on both sides of the main pipe, and a fastening member for fastening the pair of saddles to the main pipe. And a mounting portion provided with a male screw capable of being screwed into a screw hole penetrating one of the saddles is provided in the central portion in the axial direction, and a projecting portion having a screw hole is formed at one axial end of the mounting portion. A cylindrical branch pipe connecting pedestal in which a branch pipe connecting port is formed on the other axial side of the mounting portion, a shaft portion having a male screw portion at one end, and a collar portion provided at the other end of the shaft portion. And a cylindrical support attached to the pedestal by screwing the male screw portion into the female screw of the screw hole in the projecting portion in a state where the shaft portion is fitted in the branch through hole formed in the main pipe. , Cylindrical support that can be fitted to the cylindrical support and fitted to the pedestal The inner diameter becomes smaller than the outer diameter of the tubular support by being sandwiched between the collar portion and the protruding portion of the pedestal and compressed in the axial direction, and the outer diameter is smaller than the diameter of the through hole of the main pipe. And a ring-shaped seal member capable of bulging in the radial direction so as to have a large diameter.

[0007]

According to the present invention, a pair of saddles arranged on both sides of the main pipe are fastened to the main pipe by tightening with a tightening member, and a branch pipe is connected to the screw hole of one saddle fixed in this way. Since the mounting portion of the pedestal is screwed, the branch pipe connection joint can be securely and firmly attached to the main pipe regardless of the diameter of the main pipe.

The projecting portion of the pedestal thus firmly and firmly attached to the main pipe is fitted into the through hole on the main pipe side, and the male screw of the cylindrical support is fitted to the female screw of the screw hole of the projecting portion. The support is attached to the pedestal by screwing, and in this attached state, the ring-shaped seal member previously attached to the tubular support is axially formed by the flange portion and the protruding portion of the support body. When compressed, it bulges in the radial direction and comes into close contact with the wall surface of the through hole on the main pipe side and the outer surface of the support. Therefore, the gap between the wall surface of the through hole of the main pipe and the shaft portion of the support body fitted in the through hole is reliably closed by the sealing material.

By the way, when the main pipe is an aged pipe having a lining layer of hard vinyl chloride resin or the like on its inner surface, when the branch pipe connection joint is attached to the main pipe, a through hole of the main pipe is provided in the lining layer. It is necessary to make a hole corresponding to. In this case, by forming a hole in the lining layer, a gap may be created between the inner surface of the main pipe and the lining layer at the place where the hole is formed. It swells in the direction, straddles the wall surface of the through hole on the main pipe side and the wall surface of the hole of the lining layer, and closes by being in close contact with both wall surfaces.

[0010]

1 is a vertical sectional view showing a state in which a branch pipe connecting joint A according to an embodiment of the present invention is attached to a main pipe 1, and FIG. 2 is a sectional view taken along line II-II in FIG. .

The main pipe 1 is, for example, a cast iron buried gas pipe, and the inner surface thereof has a lining layer 1 of a predetermined thickness made of a hard vinyl chloride resin in order to prolong the life of the aged main pipe 1.
1 is additionally formed. Further, a through hole 12 for branching is formed at a predetermined position on the pipe wall of the main pipe 1, and a hole 13 having substantially the same diameter as the through hole 12 is also formed concentrically in the lining layer 11.

The branch pipe connection joint A includes a pair of saddles 4A and 4B arranged on both sides of the main pipe 1 and a pair of saddles 4 arranged therebetween.
Tightening members 5 and 5 for fastening A and 4B to the main pipe 1 to fix them, a tubular branch pipe connecting pedestal 6 attached to one saddle 4A, and a tubular support 7 attached to this pedestal 6. And a ring-shaped seal member 8 and the like.

Of the pair of saddles 4A and 4B, one saddle 4A is an arc-shaped saddle body 41 which is saddle-mounted on the main pipe 1.
A and the saddle body 41A are integrally provided with the flange portions 42A and 42A protruding at both ends thereof.
A and 42A are provided with bolt insertion holes 43A and 43A. Further, a boss 44A is projected at the central portion of the saddle body 41A, and the boss 44A forms a screw hole 46A having a female screw 45A. Furthermore, this saddle 4
In A, a recess 47A is provided on the inner surface side of the saddle body 41A so as to surround the screw hole 46A, and a packing 48 is fitted in the recess 47A.

The other saddle 4B integrally includes an arcuate saddle body 41B for straddling the main pipe 1 and flange portions 42B, 42B projecting from both ends of the saddle body 41B. 42B with bolt insertion hole 43
B and 43B are provided.

In this embodiment, the tightening member 5 is composed of a tightening bolt 51 and a nut 52, and the pair of saddles 4A and 4B side bolt insertion holes 4 are provided on both sides of the main pipe 1.
A nut 52 is fastened to a fastening bolt 51 inserted through 2A and 42B.

The branch pipe connecting pedestal 6 is formed in a tubular shape, and an axially central portion thereof is provided with a mounting portion 62 having a male screw 61 having a small diameter, and one end side of the mounting portion 62 in the axial direction. A protruding portion 64 having a screw hole 63 is formed, and a branch pipe connection port portion 65 is formed on the other end side in the axial direction of the mounting portion 62. The pedestal 6 is attached to the saddle 4A by screwing the male screw 61 of the attachment portion 62 into the screw hole 46A of the saddle 4A. A packing 49 is sandwiched between the mounting portion 62 and the main pipe 1 via a retainer 49a.

The cylindrical support 7 has a shaft portion 72 having a male screw portion 71 at one end and a collar portion 7 provided at the other end of the shaft portion 72.
3 with the shaft portion 72 fitted in the through hole 12 on the main pipe 1 side, the male screw portion 71 is screwed into the female screw 63a of the screw hole 63 of the protrusion 64, and
Is attached to.

The ring-shaped seal member 8 is fitted to the tubular support 7 attached to the pedestal 6 together with the retainer 81, and the collar portion 73 of the tubular support 7 is fitted.
It is sandwiched by the projecting portion 64 of the pedestal 6 and compressed in the axial direction so as to bulge inward and outward in the radial direction. Therefore, as shown enlarged in FIG. 4, the seal member 8 is in close contact with the projecting portion 64 of the pedestal 6, and the wall surface of the through hole 12 on the main pipe 1 side and the wall surface of the hole 13 of the lining layer 11 are formed. It is in close contact with both of the wall surfaces of the cylindrical support 7 and further in contact with the outer surface of the shaft portion 72 of the tubular support 7 on which the male screw 71 is not formed. As for the sealing state of the seal member 8 with respect to each part, the inner diameter of the seal member as a seal member becomes smaller than the outer diameter of the shaft portion 72 of the tubular support 7 when compressed in the axial direction. The through hole 1 of the pipe 1
It can be obtained by using a material that can swell in the radial direction so that the diameter is larger than the diameter of 2.

By the way, a square hole 75 such as a hexagonal hole is formed in the upper portion of the inner surface of the cylindrical support 7 used in this embodiment, and as shown in FIG. The rectangular head 91 is engaged with the tool 91 so that the tubular support 7 can be rotated. Therefore, the saddles 4A and 4B are attached to the main pipe 1, the pedestal 6 is attached to one of the saddles 4A, and the male screw of the cylindrical support body 7 is loosely attached to the screw hole 63 of the protrusion 64 of the pedestal 6 as shown in FIG. From the state in which 71 is screwed, the head portion 91 of the tool 9 is connected to the square hole 7
When the tubular support 7 is pulled up by engaging with 5 and rotating it, the seal member 8 previously attached to the tubular support 7 together with the retainer 81 is pushed up by the collar portion 73 and the hole in the lining layer 11 is pushed up. 13 and through hole 12 of the main pipe 1
Get in Therefore, when the cylindrical support 7 is rotated by the tool 9 and the male screw portion 71 is screwed into the screw hole 63 on the pedestal 6 side, the seal member 8 is accompanied by the collar portion of the cylindrical support 7 as described above. 73 and the protrusion 64 of the pedestal 6
And is compressed in the axial direction and bulges inward and outward in the radial direction to exert a sealing action.

Incidentally, it is desired that the wall surface of the through hole 12 on the main pipe 1 side and the wall surface of the hole 13 on the lining layer 11 side are polished and finished with a rotary grindstone or the like.
The sealing action of the sealing member 8 is surely exhibited. Further, if a liquid sealant or butyl rubber (rubber that plastically flows) is applied or attached in advance to the place where the hole 13 is formed in the lining layer 11, the airtightness can be further improved.

[0021]

Since the branch pipe connection joint of the present invention is constructed so as to be attached to the main pipe by using the saddle fixed to the main pipe, it can be securely and firmly attached to the main pipe regardless of the size of the main pipe. The effect is that it can be attached. And
In this way, the gap between the branch pipe connection joint firmly attached to the main pipe and the branch through hole formed in the main pipe is surely closed by the radially expanded seal member. There is an effect that a fluid such as a gas flowing through can be surely prevented from leaking to the outside, and in addition to this, even when a lining layer is provided on the inner surface of the main pipe, the sealing member is Since the gap between the inner surface of the pipe and the lining layer is surely closed, there is an effect that the fluid flowing in the main pipe is surely prevented from entering the gap.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state in which a branch pipe connection joint according to an embodiment of the present invention is connected to a main pipe.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical sectional view exemplifying a procedure of attaching the tubular support body to the branch pipe connection pedestal using a tool.

FIG. 4 is an enlarged cross-sectional view of a main part in FIG.

FIG. 5 is a partially cutaway side view of a conventional example.

[Explanation of symbols]

 A Branch pipe connection joint. 1 Main pipe 4A, 4B Saddle 5 Tightening member 6 Branch pipe connecting pedestal 7 Cylindrical support 8 Sealing member 46A Screw hole 61 Male screw 62 Mounting portion 63 Screw hole 64 Projection portion 65 Branch pipe connecting port portion 71 Male screw portion 72 Shaft portion 73 Tsubabe

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomoyuki Nakao 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Yoshiaki Minade 153 Tajime-cho, Kishiwada-shi No. 1 day Inside Steel Pipe Fitting Co., Ltd. (72) Inventor Ryo Otsubo One day at 153 Tajime-cho, Kishiwada City, Osaka Prefecture Inside Steel Pipe Fitting Co., Ltd.

Claims (1)

[Claims] 1. A pair of saddles arranged on both sides of the main pipe, a tightening member for tightening the pair of saddles to fix the main pipe, and a screw hole threaded through one saddle. A mounting portion having a male screw capable of being provided is provided in the central portion in the axial direction, a projecting portion having a screw hole is formed on one end side in the axial direction of the mounting portion, and a branch pipe connection port portion is formed on the other end side in the axial direction of the mounting portion. For forming a branched branch pipe connecting pedestal, a shaft portion having a male screw portion at one end, and a flange portion provided at the other end of the shaft portion for forming a branch portion on the main pipe A cylindrical support that is attached to the pedestal by screwing the male screw part into the female screw of the screw hole in the protrusion in a state of being fitted into the through hole of It is clamped by the collar of the cylindrical support and the protrusion of the pedestal, and compressed in the axial direction. As a result, a ring-shaped seal member that can bulge in the radial direction so that the inner diameter becomes smaller than the outer diameter of the tubular support and the outer diameter becomes larger than the diameter of the through hole of the main pipe. And a branch pipe connecting joint.