JPH05272683A - Pipe coupling for connecting branched pipe - Google Patents

Abstract

PURPOSE:To facilitate the installation of a pipe coupling by installing a coupling receiving fitting which can be set freely on the inner peripheral surface around a branched hole formed on a main pipe, arranging a coupling body on the outer peripheral surface around the branched hole, opposed to the receiving fitting, and connecting both by a bolt. CONSTITUTION:When a pipe coupling is installed in the connection of a branched pipe with the main pipe 1 of a gas pipe, etc., an elliptical branched hole 11 is formed at a prescribed position of the main pipe 1, and then a coupling receiving fitting 9 is inserted into the main pipe 1 through the branched hole 11. The coupling receiving fitting 9 is turned, and the projection part 9a is fitted into the branched hole 11, and in the state where the coupling receiving fitting 9 is held by a proper holding fitting, a coupling body 10 is placed on the outer peripheral surface of the main pipe 10, and a bolt 18 is slightly screwed into the tapped hole 13 on the coupling receiving fitting 9, passing through the free fitting hole 19 of the coupling body 10. Accordingly, after the coupling receiving fitting 9 is connected with the coupling body 10, the holding jig is demounted from between both 9 and 10, and the bolt 16 is firmly tightened to allow both 9 and 10 to be attached on the main pipe 1, and the installation of the pipe coupling is completed.

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 pipe 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. 7, when a branch pipe (not shown) is connected to the main pipe 1, generally, a screw hole 3 is first provided at a predetermined position of the main pipe 1 after the screw hole 3 is formed. By connecting the male threaded portion 4a formed in the lower portion of the branch pipe connecting pipe joint 4 to the screw hole 3, the pipe joint 4 is connected to the main pipe 1, and then the branch pipe connecting pipe joint 4 Branch tube part 4 protruding from the side surface
A branch pipe is connected to b.

[0003]

In the above-mentioned conventional pipe joint for branch pipe connection, the smaller the diameter of the main pipe 1, the thinner the wall thickness, and the sufficient screwing amount between the screw hole 3 and the male screw portion 4a. Since it cannot be taken, it becomes difficult to securely attach the pipe joint 4 to the main pipe 1, and the fluid such as gas flowing in the main pipe 1 may leak to the outside from the portion with a small screwing amount. was there.

Recently, in order to prolong the life of the aged main pipe 1, a technique of forming a lining layer on the inner surface of the main pipe with a synthetic resin pipe such as hard vinyl chloride has been developed.
Also in this main pipe, when the diameter is small, the pipe joint for branch pipe connection cannot be firmly attached as in the above-mentioned conventional example, and the main pipe is circulated in the gap between the main pipe and the lining layer. There is a risk that the fluid that flows in may invade and the life cannot be extended.

In view of the above-mentioned conventional problems, the present invention is a pipe joint for connecting a branch pipe, which can be firmly connected to a main pipe having a branch hole and which can prevent fluid leakage as described above. Is intended to provide.

[0006]

To achieve the above object, the first aspect of the present invention is a pipe joint for connecting a branch pipe, wherein the joint body is connected to a branch hole formed at a predetermined position of the main pipe. The joint main body has a joint receiver that is inserted into the main pipe through the branch hole and faces the inner peripheral surface around the branch hole of the main pipe, and a joint main body that faces the outer peripheral surface around the branch hole of the main pipe. It is characterized in that both of them and the joint receiver are integrally connected by a bolt so as to be sandwiched between the main pipes.

The second aspect of the present invention is characterized in that a sealing material is interposed between the joint body and the joint receiver, and between the joint receiver and the inner peripheral surface of the main pipe.

Further, the third aspect is characterized in that a sealing material is interposed between the joint body and the outer peripheral surface of the main pipe.

[0009]

According to the first aspect of the present invention, the joint receiver inserted into the main pipe through the branch hole is made to face the inner peripheral surface of the main pipe around the branch hole, and the joint main body outer peripheral surface around the branch hole. The joint body can be firmly connected to the main pipe by simply connecting both of them by bolts after facing each other.

According to the second aspect of the present invention, the sealing material seals between the joint body and the joint receiver and between the joint receiver and the inner peripheral surface of the main pipe, so that fluid such as gas flowing in the main pipe There is no risk of leakage to the outside.

According to the third aspect of the present invention, since the sealing material seals between the joint body and the outer peripheral surface of the main pipe, a fluid such as water may intrude from the outside to the connection portion between the joint body and the main pipe. There is no.

[0012]

1 to 3 show a state in which a branch pipe connecting pipe joint according to an embodiment of the present invention is connected to a main pipe 1,
The pipe joint mainly includes a joint receiver 9 and a joint main body 10 that are sandwiched at a predetermined position of the main pipe 1, and a bolt 16 that integrally connects the both.

The main pipe 1 is, for example, a cast iron buried gas pipe, and a lining layer 5 is attached to the inner surface of the main pipe 1 with a synthetic resin pipe such as hard vinyl chloride in order to extend the life of the main pipe 1. Has been formed. Further, at a predetermined position of the main pipe 1, a branch hole 11 penetrating the upper portion of the main pipe 1 and the lining layer 5 and having an oval or elliptical shape in plan view is formed.

The joint receiver 9 is oval or elliptical in plan view, and its height H is shorter than the width R of the branch hole 11 and its lateral width L is shorter than the major diameter K of the branch hole 11. It is set so that it can pass through the branch hole 11 by making the joint receiver 9 face up [Fig. 4 (a)].
(B)]. In addition, the annular protrusion 9 that protrudes from the center of the upper surface
a is fitted into the branch hole 11. In addition, the protrusion 9
The a and the branch hole 11 are formed to have an oval shape or an elliptical shape in a plan view by fitting the protrusion 9a into the branch hole 11 so that the joint receiver 9 does not rotate with respect to the main pipe 1. This is because.

Further, by forming the upper surface of the flange-shaped outer peripheral portion 9b of the joint receiver 9 into a shape along the inner peripheral surface of the main pipe 1,
Annular sealing material 12 fitted in an annular groove formed on the upper surface
Is in contact with the inner peripheral surface of the main pipe 1, whereby the fluid such as gas flowing in the main pipe 1 leaks to the outside through the gap between the joint receiver 9 and the lining layer 5. I try not to. Therefore, there is no possibility that fluid such as gas will enter the gap 6 between the main pipe 1 and the lining layer 5.

Still further, the annular projection 9 of the joint receiver 9 is
A pair of circulation holes 15 are formed in a, and a screw hole 13 is formed in the central connecting portion 14 provided between the circulation holes 15.

The joint body 10 has a substantially T-shaped vertical cross section, and a pair of through holes 17 are formed in the lower portion 10a thereof, and a central connecting portion 18 provided between the through holes 17.
A loose fitting hole 19 is formed in the main body 1, and a bolt 16 is screwed into the threaded hole 13 of the joint receiving member 9 through the loose fitting hole 19 so that the joint body 10 and the joint receiving member 9 are attached to the main pipe 1. It is sandwiched.

Further, on the lower surface of the collar portion 10b projectingly provided on the outer peripheral portion of the lower end of the joint body 10, the protruding portion 9a of the joint receiver 9 is formed.
A fitting concave portion 21 that fits in the concave portion 21 is provided, and a seal member 22 fitted in the concave portion 21 seals between the joint receiver 9 and the joint body 10. Further, by forming the lower surface of the collar portion 10b in a shape along the outer peripheral surface of the main pipe 1, the annular sealing material 23 fitted in the annular groove formed in the outer peripheral portion of the lower surface is attached to the outer peripheral surface of the main pipe 1. The contact is made so that a fluid such as water does not enter the inner side from the outer side of the main pipe 1 through the gap between the collar portion 10b and the outer peripheral surface of the main pipe.

A branch pipe (not shown) is connected to the branch tube portion 10c protruding from the side surface of the joint body 10 via a mechanical seal or the like. Reference numeral 25 is a stopper that is screwed into the joint body 10 to block the flow hole 17 of the joint body 10. A packing material 26 is attached to the lower surface of the joint body 10, and a wrench hole 27 is provided on the upper surface thereof. It is recessed.

The procedure for mounting the pipe joint will be described with reference to FIG.
As shown in (a) and (b), the main pipe 1 and the lining layer 5
After the branch hole 11 is formed at a predetermined position, the joint receiving tool 9 is inserted into the main pipe 1 through the branch hole 11, and subsequently, as shown in FIG. The protrusion 9
6A is inserted into the branch hole 11, and the fitting state of the joint receiver 9 is held by the holder 29 as shown in FIG. 6, so that the joint receiver 9 does not fall into the main pipe 1. Lock on.

Thereafter, as shown in FIGS. 1 to 3, the main pipe 1
The joint body 10 is mounted on the outer peripheral surface of the joint body 10, and the bolt 16 is slightly screwed into the screw hole 13 of the joint body fitting 9 through the loose fitting hole 19 of the joint body 10 to joint the joint body 9 with the joint body 9. After connecting to the main body 10, the holder 29 is removed from between the both 9 and 10, and then the bolt 16 is strongly screwed in to clamp the joint body 10 and the joint receiver 9 to the main pipe 1. Good.

When the branch pipe connecting pipe joint is attached to the main pipe 1 as described above, the stopper 2 in the joint body 10 is provided.
The flow hole 17 is shut off at 5, the air in the main pipe 1 is evacuated and a fluid such as a gas is circulated in the main pipe 1, and the branch cylindrical portion
The branch pipe is connected to c through a mechanical seal. After finishing this work, move the stopper 25 to the upper part,
Screw a screw plug (not shown) to the joint body 10,
A fluid such as gas may be passed through the branch pipe side. It should be noted that the area around the connecting portion of the branch pipe is protected with a corrosion-resistant material such as a corrosion-resistant sheet.

[0023]

According to the first aspect of the present invention, since the joint receiver and the joint main body which face each other with the main pipe interposed therebetween are firmly connected together by the bolt, the joint receiver and the joint main body are connected to each other. It can be securely attached even to a small-diameter main pipe.

According to the second aspect of the present invention, the sealing material reliably seals between the joint body and the joint receiver and between the joint receiver and the inner peripheral surface of the main pipe. There is no risk that the fluid in will leak to the outside.

Particularly, even when a lining layer is attached to the inner peripheral surface of the main pipe, there is no possibility that the fluid in the main pipe will enter the gap between the main pipe and the lining layer.

Further, according to the third aspect of the invention, since the sealing material also reliably seals between the joint body and the outer peripheral surface of the main pipe,
As described above, even when a lining layer is attached to the inner surface of the main pipe, there is no risk of fluid such as water entering from the outside into the gap between the main pipe and the lining layer, Surface corrosion can be reliably prevented.

[Brief description of drawings]

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

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 (a) is a vertical sectional view showing a state in which a joint receiver used in the pipe joint for connecting the branch pipe is inserted into a branch hole of the main pipe, and FIG. 4 (b) is a horizontal sectional view thereof.

FIG. 5 is a vertical cross-sectional view showing a state in which the joint receiver is fitted in a branch hole.

FIG. 6 is a vertical cross-sectional view of the joint receiver temporarily fixed to the inner peripheral surface of the main pipe.

FIG. 7 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

 1 main pipe 9 joint receiver 10 joint body 11 branch hole 12 sealing material 16 bolt 22 sealing material 23 sealing material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Nakao 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. 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 (3)

[Claims] 1. A pipe joint for connecting a branch pipe, wherein a joint body is connected to a branch hole formed at a predetermined position of the main pipe, the inner periphery around the branch hole of the main pipe being inserted into the main pipe through the branch hole. A joint receiver that faces the surface and a joint body that faces the outer peripheral surface around the branch hole of the main pipe, and the joint body and the joint receiver are integrally connected by bolts. A pipe joint for connecting a branch pipe, characterized in that it is sandwiched by the main pipe. 2. The pipe joint for branch pipe connection according to claim 1, wherein a seal material is interposed between the joint body and the joint receiver and between the joint receiver and the inner peripheral surface of the main pipe. 3. The branch pipe connecting pipe joint according to claim 1, wherein a sealing material is interposed between the joint main body and the outer peripheral surface of the main pipe.