JP2000039092A - Branch part forming method by non-blow system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch part forming method for an existing pipe, capable of connecting the branch pipe while reliably preventing fluid such as gas from being discharged by a simple operation. SOLUTION: In this branch part forming method by a non-blow system, for forming a new branch part while allowing fluid to flow in an existing pipeline 1, a hole is formed in a branch part forming position of the existing pipeline 1, an expandable and deformable stopper 4 is supported to the inner surface of the hole in a state where it may be inserted into a branch connecting joint 6 to be mounted on the hole, and the branch connecting joint 6 is mounted in the hole in a state where the stopper 4 supported on the inner surface of the hole is inserted into the opening of the branch connecting joint 6 communicated with the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a branch portion, and more particularly, to a method of flowing a gas through a branch pipe when taking out a branch pipe using a split joint in the middle of an existing gas pipe. The present invention relates to a method for forming a branch portion in which a branch pipe is taken out in a state where there is no gas leakage even if the work is performed without stopping the gas supply while the branch pipe is being supplied.

[0002]

2. Description of the Related Art When taking out a branch pipe from an existing pipeline, if the flow of gas in the pipeline is interrupted, it may cause a lot of trouble to a gas demander located downstream of the work site. Occurs. Therefore, in order to be able to take out the branch pipe in an unbroken condition with the gas flowing through the main pipe,
For example, there has been proposed an unbreakable branch extraction method described in Japanese Patent Application Laid-Open No. 57-37186, and an unbreakable branch extraction splitting joint used for this method (Japanese Patent Application Laid-Open No. Sho.
7-37184).

[0005] An example in which a branch pipe is taken out using a split joint will be described with reference to FIG.

First, as shown in FIG. 5A, a pair of upper and lower split joints b and c are placed at a desired branch take-out position in the main pipe a.
Is attached. The split joints b and c are attached in an airtight state by tightening the opposing flanges with bolts in a state where the split joints b and c are brought into airtight contact with the outer peripheral surface of the main pipe a. A cylindrical opening wall d that forms an extraction passage is formed.

After the split joints b and c have been attached, a drilling machine adapter e is set on the cylindrical mouth wall d as shown in FIG. 5 (b), and a drill hole source f is driven by a motor m attached thereto. Is cut into the pipe wall, and a branch outlet of a required diameter is drilled. After this drilling, the hole source of the drilling machine adapter e is
When gas is extracted, gas is released from the branch outlet opened in the pipe wall. Then, with the drilling machine adapter e still set, as shown in FIG.
Install. This working bag g is attached such that its mounting opening is brought into close contact with the cylindrical opening wall d so as to be air-tight with a tape or the like.

Thereafter, the operator's hand is inserted through the insertion opening of the working bag g, and as shown in FIG. 5D, the drilling machine adapter e is removed in the working bag g, and chips are removed from the pipe. The work of replacing the service tee h with the stopper s installed in the opening which is the connection joint for branching at the outlet port pierced in the pipe wall is performed.

According to the above-described operation procedure, when replacing the drilling machine adapter e and replacing it with the service tee h, these operations are performed in the no-blowing work bag g. Even when work is performed in a non-disconnected state with the gas flowing through the pipe a, the branch pipe can be taken out without leaking gas into the atmosphere.

On the other hand, in the above construction example, in the construction stage shown in FIG. 5 (d), the discharge gas from the main pipe a is prevented from leaking to the outside by using the no-blowing work bag g. In addition to the above, a means for stopping the release of gas from the main pipe a is adopted. That is,
In FIG. 5, when the service tee h is attached, a drilling machine adapter e is inserted into the opening of the split joint b facing the opening drilled in the main pipe, and the drilling machine stopper e is removed. At the same time, the service tee h is fastened to the pipe opening wall d of the split joint b. By such a procedure, the opening itself of the split joint b is closed by the service tee equipped with a stopper in advance, so that the drilling machine adapter e
The release of gas when removing is suppressed.

[0009]

By the way, it is desirable from the viewpoint of the capacity of the bag that even when the bag for the no-blow operation is used, the emission of gas is kept small. Alternatively, in any case in which the stopper is provided on the service tee side in addition to the stopper, the opening is opened until the drill pier adapter is removed from the opening and the service tee is attached, so that gas is inevitably released. In particular, when the service tee is attached to the opening by fastening work, that is, on the inner surface of the cylindrical wall, the fastening cannot be performed smoothly unless the opening of the split joint is aligned with the axial center position of the service tee. If it takes time, outgassing during that time is inevitable.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional branch portion forming method, an object of the present invention is to form a branch portion of an existing pipeline capable of connecting a branch pipe while reliably preventing discharge of fluid such as gas by a simple operation. To provide a construction method.

[0011]

In order to achieve this object, an invention according to claim 1 is directed to a method for forming a branch portion by a no-blowing method in which a new branch portion is formed while a fluid is flowing in an existing pipeline. After forming a perforation at the branch forming position of the existing pipeline, a stopper capable of being expanded and contracted and deformable in a state capable of being inserted into the inside of the branch connection joint attached to the perforation is tightly supported on the inner surface of the perforation, and the inner surface of the perforation is formed. The branch connection joint is attached to the hole while a stopper in close contact with the hole is inserted into the opening of the branch connection joint communicating with the hole.

According to a second aspect of the present invention, in the method of forming a branch portion according to the first aspect, the stopper is attached to the inner surface of the perforation by mounting the stopper in the perforation while the perforated portion is blocked from the outside. It is characterized by close contact.

According to a third aspect of the present invention, in the branch portion forming method by the no-blow method according to the first aspect, the branch connection joint exposes the hole to the outside after the stopper is mounted in the hole. It is characterized in that it is attached to the perforation in a state where it has been made to work.

[0014]

According to the first to third aspects of the present invention, it is possible to prevent the discharge of the fluid by the stopper for the perforations formed in the existing pipeline. For this reason, since the perforation of the existing pipeline is continuously sealed by the stopper from the formation of the perforation to the mounting of the branch connection joint, no fluid is released from the existing pipeline, and the stopper is connected to the branch connection. Since the connector can be inserted into the joint, the branching connection joint can be attached while the stopper is attached to the hole.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The branch part forming method according to the embodiment of the present invention is based on a case where a transition service tee equipped with a relay short pipe for connecting a new pipeline in advance and having a longer lateral extension length is used as a joint for branching. Although the present invention is applied to the present invention, the present invention is not limited to the type of the joint for branching, and may be applied to a service tee having a smaller turning radius at the time of fastening than a transition service tee without using a relay short pipe. In the branch part forming method according to the embodiment of the present invention, as shown in FIG. 1, the split joints 2 and 3, the stopper 4, and the no-blow work bag 5 and the transition service shown in FIG. Q6 is used as the main member. Hereinafter, the details will be described. In FIG. 1, split joints 2 and 3 are made of a half-split member made of polyethylene resin, coated steel, or cast iron divided into upper and lower parts, and left and right flange parts 2a,
3a is tightly joined to the outer peripheral surface of the pipeline 1 by tightening both ends and a central portion with bolts. The split joint 2 located on the upper side is provided with a cylindrical mouth wall 2b having a branch passage opening at the center thereof, and the inner surface of the cylindrical mouth wall 2b has a screw hole (indicated by a dashed line in the figure).
Is formed.

As shown in FIG. 2, the stopper 4 has a sealing member main body 4b inserted into a screw rod 4a having a screw formed at both ends in the axial direction, and an end in the extension direction of the sealing member main body 4b. A push rod 4c that is inserted into the screw rod 4a in contact with the upper surface of the sealing portion main body 4b,
Push rod 4c screwed into the threaded part of screw rod 4a
And an operation nut 4d capable of pressing the pressure. The sealing member body 4b is made of an elastically deformable member such as rubber, and has a length in the axial direction which is fastened to the branch passage opening of the branch joint 2 in accordance with the diameter of the existing pipeline 1. In addition to the length of the connecting portion, the length is set so that the tip thereof can be inserted into the existing pipeline 1, and the inner diameter of the branch passage and the inner diameter of the bore of the existing pipeline 1 due to expansion and contraction of the outer diameter. It can be changed in response to. The sealing portion main body 4b is expanded in the outer radial direction by being compressed in the axial direction by the push rod 4c, and when the compression is released, the shape is restored to a state where it can be inserted into the branch passage opening 2b and the perforation. . The push rod 4c can advance and retreat along the axial direction of the screw rod 4a according to the rotation amount of the operation nut 4d, and expands and contracts the sealing member body 4b according to the advance and retreat amount to form a branch passage and an existing pipeline. 1 can be brought into close contact with the inner surface of the perforation or released.

The no-blowing work bag 5 is formed of a transparent bag having a size enough to accommodate the stopper 4, and a hand can be inserted into the bag so that necessary work can be visually checked as described later.

In this embodiment, a branch portion can be formed by using the above-described members in the following procedure. 3 and 4
5 is a schematic view corresponding to FIG. 5 showing a procedure for explaining a branch portion forming method according to the embodiment of the present invention. In FIG. 3 is attached. As in the case shown in FIG. 5, the branch joints 2 and 3 are hermetically attached by abutting and fastening the flange portions 2a and 3a of the split joints 2 and 3 from the upper and lower surfaces of the existing pipeline 1. .

As shown in FIG. 3B, a drilling machine adapter 7 is set on the pipe mouth wall of the upper joint 2 of the split joints 2 and 3 to branch off the existing pipeline 1. A hole 1a for opening is formed.

After the perforation is formed, the no-blowing work bag 5 is mounted on the outer periphery of the cylindrical mouth wall 2b of the split joint 2. When the no-blowing work bag 5 is mounted, the no-blow working bag 5 is sealed with a chip removing means 8 using a magnet bar or the like, a stopper 4, and a nipple. In FIG. 3 (c), when the no-blowing work bag 5 is attached to the pipe mouth wall 2b of the split joint 2, the drilling machine adapter 7 is removed from the pipe mouth wall 2b, and instead, the chip removing means 8 is provided in the existing pipe line 1. Chips generated at the time of perforation formation by being inserted into the pipe are removed from the interior of the existing pipeline 1 and the periphery of the cylindrical opening wall 2b.
As shown in (d), the stopper 4 is used to pierce the existing pipeline 1
a.

In FIG. 3D, the stopper 4 turns the operation nut 4d in a state where the sealing body 4b provided at the tip thereof is inserted into the perforation 1a of the existing pipeline 1 and enters the existing pipeline 1. As a result, the sealing portion main body 4b is expanded so as to be in close contact with the inner surface of the hole 1a. At this time, the sealing portion main body 4b only comes into close contact with the inner surface of the perforation 1a, but does not contact the inner surface of the cylindrical opening wall 2b. This is to provide a fastening allowance when a later-described transition service tee 6 is fastened to the threaded portion formed on the inner surface of the tube opening wall 2b. When the stopper 4 keeps the sealing portion main body 4b in close contact with the inner surface of the perforation 1a, leakage of gas from the existing pipeline 1 is shut off. For this reason, the no-blowing work bag 5 is set in a state in which it can be removed from the tube opening wall 2b.

When the no-blowing work bag 5 is removed from the tube mouth wall 2b, the transition service tee 6 is then fastened to the tube mouth wall 2b. When the transition service tee 6 is fastened to the tube opening wall 2b, as shown in FIG. 4 (a), the stopper 4 can be inserted inside. Thereby, the transition service tee 6 can insert the stopper 4 inside in a state of being exposed to the outside due to the removal of the no-blowing work bag 5, so that the opening side communicating with the perforation 1 a of the existing pipeline 1 is closed. It is attached to the tube opening wall 2b by fastening. In this case, the transition service tee 6 is simply screwed in such a manner that the service tee 6 does not fall down, so that the transition service tee 6 is in a temporarily fixed state. This is because when the transition service tee 6 is fully engaged, the sealing portion main body 4b of the stopper 4 located in the bore 1a of the existing pipeline 1 and the cylindrical opening 2b of the split joint 2 is likely to be twisted. This is to prevent the situation.

At the stage where the transition service tee 6 is temporarily fixed to the split joint 2 on the tube opening wall 2b, the stopper 4 makes the sealing portion main body 4b located at the tip end adhere to the inner surface of the bore 1a of the existing pipeline 1. Since it is left as it is, the leakage of the gas from the existing pipeline 1 is maintained as it is even if the migration service tee 6 is exposed to the outside.

When the transition service team 6 is concluded, the no-blowing work bag 5 is attached to the transition service team 6 again as shown in FIG.
In this state, the end of the sealing portion main body 4b of the stopper 4 is pulled up, and the stopper 4 is positioned on the transition service tee 6 side. When the sealing portion main body 4b of the stopper 4 is positioned on the side of the transition service tee 6, it is sealed on the connection surface between the transition service tee 6 and the split joint 2, that is, on the inner surface of the transition service tee 6 located in the cylindrical mouth wall 2b. The main body 4b is brought into close contact. Thus, even when the transition service tee 6 is further rotated from the temporarily fixed state and is wisely fastened, the sealing portion main body 4b of the stopper 4 can be rotated without receiving a torsional load, and the transition service tee 6 is provided on the transition service tee 6 side. Leakage of gas from the perforations 1a of the pipeline 1 to the outside can be blocked.

On the other hand, as shown in FIG. 4B, the no-blowing work bag 5 when the transition service tee 6 is wisely fastened has the relay short tube 6a of the transition service tee 6 exposed to the outside. Is attached to the transition service team 6. As shown by reference numeral 9, a stopper or a cap is attached to the relay short tube 6a exposed to the outside so as to be closed.

When the connection of the new branch pipe 9 is completed, the stopper 4 is removed from the transition service tee 6 by inserting a hand into the no-blowing work bag 5, and the transition service tee 6 is placed on its top. Sealing is achieved by mounting the plug 6b (see FIG. 4).

[0027]

As described above, according to the first to third aspects of the present invention, it is possible to prevent the discharge of the fluid by the stopper for the perforations formed in the existing pipeline. For this reason, since the perforation of the existing pipeline is continuously sealed by the stopper from the formation of the perforation to the mounting of the branch connection joint, no fluid is released from the existing pipeline, and the stopper is connected to the branch connection. Since the connector can be inserted into the joint, the branching connection joint can be attached while the stopper is attached to the hole. As a result, the release of the fluid from the existing pipeline is prevented until the stopper is removed from the perforation, so that the fluid can be removed by a simple operation without a special procedure such as quickening the installation of the branch connection joint. By installing the branch connection joint without causing leakage, it becomes possible to configure a new branch portion for the existing pipeline.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an existing pipeline for explaining an apparatus used in a branch portion forming method according to an embodiment of the present invention.

FIG. 2 is a perspective view for explaining a configuration of a stopper in the apparatus shown in FIG.

FIG. 3 is a schematic view for explaining a procedure of a branch portion forming method according to an embodiment of the present invention.

FIG. 4 is a schematic view for explaining another procedure of the branch portion forming method according to the embodiment of the present invention.

FIG. 5 is a schematic view for explaining a conventional example of a branch portion forming method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Existing pipe line 1a Perforation 2, 3 Split joint 4 Stopper 4b Sealing part main body 5 No-blowing work bag 6 Transition service tee equivalent to branching joint 6a Relay short pipe 7 Drilling machine adapter 8 Chip elimination means 9 New Branch pipe

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Sato 2-26-1, Higashihorikiri, Katsushika-ku, Tokyo F-term (reference) 3H019 AA01 AA04 BA04 BB01 CB01 DA01 DA03

Claims (3)

[Claims] 1. A method for forming a branch portion by a no-blowing method in which a new branch portion is formed while a fluid is flowing in an existing pipeline, wherein a hole is formed at the branch portion forming position of the existing pipeline, and then the hole is formed. An opening of the branch connection joint that supports a stopper that can be expanded and contracted and deformed in a state capable of being inserted into the inside of the branch connection joint to be mounted and that is in close contact with the inner surface of the hole and communicates with the hole. A method for forming a diverging portion by a no-blow method, wherein the diverging connection joint is attached to the perforation while being inserted through the inside. 2. The method according to claim 1, wherein the stopper is attached to the inner surface of the perforation when the stopper is mounted in the perforation while the perforation is blocked from the outside. No-blow method for forming a branch. 3. The branch forming method according to claim 1, wherein the connection joint for branching is formed by exposing the hole to the outside after the stopper is mounted in the hole. A method for forming a branch portion by a no-blow method, which is mounted on a surface.