JPH05248584A - Branched part seal method of lining pipe - Google Patents

Abstract

PURPOSE:To provide a sealing means to seal the exposed part at the branched part where no adhesion is given between a fluid conduit and a plastic pipe which is lined on the inner circumferential surface of the fluid conduit, and there has conventionally been no appropriate technology to seal the exposed part. CONSTITUTION:A base part cylindrical body 4 where a tapered inner surface part 4a is formed in its inner surface is fitted to a fluid conduit 1, and at the same time, one end part of a sleeve 5 which is internally inserted into the base part cylindrical body 4 is connected to a plastic pipe 2. A seal ring 6 us arranged in a space between the sleeve 5 and the tapered inner surface part 4a. A cylindrical body for connecting the branch joint 7 is fitted to the base part cylindrical body 4 while the seal ring 6 being pushingly pressed by screwing and tightening the cylindrical body for connecting the branch joint 7 to the base part cylindrical body 4. A branch joint 3 is fitted to the cylindrical body for connecting the branch joint 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a branch portion of a lining pipe, and more particularly, to a branch portion in which one end side of a branch joint is connected by utilizing a female screw hole formed in a peripheral portion of a fluid conduit. A plastic pipe is inserted into the fluid conduit in which the plastic pipe is formed, the plastic pipe is laid along the inner peripheral surface of the fluid conduit, and a through hole is formed in the plastic pipe at a location where the female screw hole of the fluid conduit is formed. The present invention relates to a method for sealing a branched portion of a lining pipe, which seals the branched portion in a lining pipe in which the inner peripheral surface is lined so that the branched portion is opened.

[0002]

2. Description of the Related Art As a means for rehabilitating a fluid conduit that has been used for a long time for introducing a fluid such as gas or water, a plastic tube is lined on the inner peripheral surface of the tube. The lining is performed, for example, by inserting a plastic tube into the fluid conduit and then pressurizing and heating and expanding the interior of the plastic tube along the inner peripheral surface of the fluid conduit. By the way, at a place where the fluid flow path needs to be branched in the fluid conduit, for example, a female screw hole for screwing a male screw portion for connection of a branch joint is formed in the fluid conduit, and the female screw hole is formed. The branch portion is formed by screwing and fastening the male screw portion for connection. When a plastic pipe is lined on the inner peripheral surface of the fluid conduit in which the branch portion is formed as described above, the fluid branch passage in the branch portion is not opened when the plastic pipe is lined, so that portion is opened. Therefore, a through hole is formed at a position corresponding to the branch portion of the plastic pipe.

[0003]

In the state where the plastic pipe is lined on the inner peripheral surface of the fluid conduit, the plastic pipe is simply laid along the fluid conduit from the inside, and there is no gap between the two. It is in a bonded state. Therefore, in the place where the through hole is formed in the plastic pipe, the non-adhesive portion between the two is exposed to the fluid branch passage of the branch portion, but conventionally, the exposed portion can be sealed. I didn't have the right technology,
The sealing property in that part sometimes became a problem.
For example, when a hole is opened in a part of the fluid conduit due to corrosion, breakage, etc., the hole is connected to the fluid conduit via the non-adhesive part and the exposed part, There was a problem that the fluid in the conduit would leak. The present invention has been made in view of such circumstances, and an object thereof is to provide a method for enabling the work of sealing the exposed portion.

[0004]

According to the method for sealing a branching portion of a lining pipe according to the present invention, a male screw portion is formed on one end side, a female screw portion is formed on the other end side, and the inner surface is One end of a sleeve that is fitted into a base tubular body having a taper inner surface portion having a larger diameter toward the female screw portion is joined to the plastic pipe, and the male screw portion is formed into a female screw hole of the fluid conduit. By attaching to the fluid conduit by screwing, a seal ring is arranged in the space between the sleeve and the taper inner surface portion, and a branch joint connecting tubular body having a male screw portion formed on one end side, After attaching the branch joint connecting tubular body to the base tubular body while pressing the seal ring by screwing and tightening the male threaded portion to the female threaded portion of the base tubular body, the For connecting one end of the branch joint to the branch joint It is characterized in that connected to the other end of the Jo body.

[0005]

According to the method of the present invention, it is arranged in the space between the sleeve and the taper inner surface portion, and is pressed by the attachment of the branch joint connecting tubular body to the base tubular body. Due to the sealing action of the seal ring, the exposed portion of the non-bonded portion between the fluid conduit and the plastic tube to the fluid branch passage becomes sealed.

[0006]

Therefore, it is possible to realize the sealing of the portion of the plastic pipe where the through hole is formed,
The conventional problem due to the lack of sealing at that portion can be solved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment (hereinafter referred to as a first embodiment) in which a branch portion of a pipe having an inner surface lined and rehabilitated is sealed at a branch portion thereof.

In the drawing, reference numeral 1 is a fluid conduit (gas pipe) for guiding gas, and a branch joint (not shown) (hereinafter referred to as an old branch joint) is originally attached to a required branch point of the fluid conduit 1. A branch portion was formed. Specifically, a female screw hole 1a having a female screw formed on the inner peripheral surface is formed at a required branch point of the fluid conduit 1, and the female screw hole 1 is formed.
The male threaded portion for connection of the old branch joint was screwed into a to form a branched portion.

When such a fluid conduit 1 is used for a long period of time, the fluid conduit 1 is rehabilitated for further use. After inserting a plastic pipe 2 made of a thermoplastic resin such as polyethylene, vinyl chloride resin, polyester or the like into the peripheral surface, the interior of the plastic pipe 2 is pressurized and heated to expand along the inner peripheral surface of the fluid conduit 1. Done by.

Thus, when the plastic pipe 2 is lined on the inner peripheral surface of the fluid conduit 1, if the plastic pipe 2 is left as it is, the flow path of the branch portion remains closed, so that portion is opened. Therefore, a through hole 2a is formed in a portion of the plastic pipe 2 corresponding to the branch portion. By the way, since the plastic pipe 2 is simply provided along the inside of the fluid conduit 1 from the inside, and the two are in a non-bonded state, the place where the through hole 2a is formed in the plastic pipe. Then, since the non-bonded portion between the both is exposed in the flow path of the branch portion, the exposed portion is sealed by the method of the present invention described below.

First, after removing the old branch joint, the plastic pipe 2 is laid along the inner peripheral surface of the fluid conduit 1 for lining. Then, a through hole 2a is formed at a position corresponding to the branched portion of the lined plastic pipe 2. After that, the sleeve 5 whose main part is made of the same or equivalent material as that of the plastic pipe 2 is arranged along the axial direction in the opening direction of the female screw hole 1a, and one end 5a of the sleeve 5 is formed into the female screw hole. 1a, one end 5a of which is attached to the plastic pipe 2 (more specifically,
The plastic pipe 2 is joined to the peripheral portion of the through hole 2a formed therein. As the joining method, a method such as heat welding or adhesion using an adhesive can be considered. A thin metal cylinder 5b is closely fitted in the sleeve 5, and the thin cylinder 5b reinforces the sleeve 5. In parallel with the joining of the sleeve 5, a male screw portion 4b is formed on one end side and a female screw portion 4c is formed on the other end side, and the inner surface has a taper inner surface having a larger diameter toward the female screw portion side. The base tubular body 4 in which the portion 4a is formed is attached to the fluid conduit 1 by screwing the male screw portion 4b into the female screw hole 1a of the fluid conduit 1. The joining work of the sleeve 5 and the attaching work of the base tubular body 4 are
Either of them may be performed first, but in the present embodiment, the work of joining the sleeve 5 is preceded in consideration of workability. Then, a seal ring 6 (for example, an O-ring) is arranged in a space formed between the tapered inner surface portion 4 a of the base tubular body 4 and the sleeve 5. Thereafter, the branch joint connecting tubular body 7 having the male screw portion 7a formed on one end side
The male screw portion 7a of the female screw portion 4 of the base tubular body 4
The branch joint connecting tubular body 7 is attached to the base tubular body 4 while pressing the seal ring 6 by screwing and tightening to c. Then, at the other end of the branch joint connecting tubular body 7, a male screw portion 3a formed on one end side of the branch joint 3 newly attached to the fluid conduit 1 in place of the old branch joint and a male screw portion 3a are screwed. A female threaded portion 7b that can be fitted is formed in advance, and the male threaded portion 3a of the branch joint 3 is screwed onto the female threaded portion 7b, so that one end of the branch joint 3 is tubular for connecting the branch joint. Connect to the other end of the body 7.

Next, another embodiment will be described. The through hole 2a of the plastic pipe 2 is formed in the plastic pipe 2 after the sleeve 5 is joined to the outer peripheral surface of the plastic pipe 2 while the through hole 2a is not formed in the plastic pipe 2. May be.

Further, the branch joint connecting tubular body 7 may be a cylindrical body whose diameter does not change in the axial direction, as shown in FIG.

As described above, the branch joint connecting tubular body 7 is a cylindrical body whose diameter does not change in the axial direction, and the outer diameter of the base tubular body 4 is shown in FIG. As shown, an embodiment in which a tubular body that does not change in the axial direction is also conceivable.

In the above-described embodiment, the present invention is applied to the case of sealing the branch portion of the lining pipe in which the fluid conduit for guiding the gas pipe is rehabilitated. However, the present invention applies another fluid conduit. It can also be applied when rehabilitated lining pipes, for example, fluid conduits for guiding tap water, are used to seal the branches of rehabilitated lining pipes.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the method of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the method of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the method of the present invention.

[Explanation of symbols]

 1 Fluid Conduit 1a Female Threaded Hole 2 Plastic Pipe 2a Through Hole 3 Branch Joint 4 Base Cylindrical Body 4a Tapered Inner Surface 4b Male Threaded Section 4c Female Threaded Section 5 Sleeve 6 Seal Ring 7 Branched Joint Connecting Cylindrical Body 7a Male Threaded Section

Claims (1)

[Claims] 1. A fluid conduit (1) in which one end of a branch joint (3) is connected using a female screw hole (1a) formed in a peripheral portion of the fluid conduit (1) to form a branch portion. On the other hand, a plastic pipe (2) is inserted into the inside of the plastic pipe (2) so that the plastic pipe (2) extends along the inner peripheral surface of the fluid conduit (1) and the female of the fluid conduit (1) of the plastic pipe (2). In the lining pipe in which the lining of the inner peripheral surface is performed by opening the branch portion by forming the through hole (2a) at the position where the screw hole (1a) is formed, the lining for sealing the branch portion. A method for sealing a pipe branch portion, wherein a male screw portion (4b) is formed on one end side and a female screw portion (4c) is formed on the other end side, and the inner surface is larger toward the female screw portion side. Base cylindrical body formed with tapered inner surface portion (4a) 4) The one end of the sleeve (5) fitted inside is joined to the plastic pipe (2), and the male screw portion (4b) is screwed into the female screw hole (1a) of the fluid conduit (1). To the fluid conduit (1) by
A branch joint connecting tubular body (7) in which a seal ring (6) is arranged in a space between the sleeve (5) and the tapered inner surface portion (4a), and a male screw portion (7a) is formed on one end side. ) Is tightened by screwing the male screw portion (7a) thereof onto the female screw portion (4c) of the base tubular body (4), thereby pressing the seal ring (6) and connecting the branch joint. A lining pipe that connects the tubular body (7) to the base tubular body (4) and then connects one end side of the branch joint (3) to the other end side of the branch joint connecting tubular body (7). How to seal the branch part.