JPH05223191A - Method and device for sealing branch part of lining pipe - Google Patents

Abstract

PURPOSE:To provide a means for sealing an unbonded part which exists between a fluid conduit and a plastic pipe lined on its inside face and is exposed at a branch part. CONSTITUTION:A male thread tube part 3b for clamping having a diameter smaller than the outer diameter of a male thread part 3a for connection is formed beforehand on more tip side of a branch joint 3 beyond the thread part 3a. A through hole 2a where the male thread tube part 3b for clamping can be passed through is perforated on a plastic pipe 2 lined thereon. A ring type female thread body 4, foldably and developably formed so as to pass through the through hole 2a in its folded state and so as to be screw-attached to the male thread tube part 3b for clamping in its opened state, is set in the plastic pipe 2 through the through hole 2a. The ring type female thread body 4 in an opening state is screw-attached and clamped to the male thread tube part 3b for clamping, after the male thread tube part 3b for clamping is passed through the through hole 2a, for inserting into the plastic pipe 2 while intervening appropriately a seal ring 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for sealing a branch portion of a lining pipe, and more particularly, a male thread portion for connection of a branch joint is threaded by utilizing a female thread hole formed on a fluid conduit side. For the fluid conduit to be attached to form the bifurcation,
The present invention relates to a method for sealing a branched portion of a lining pipe, which is performed after inserting a plastic pipe into the inside of the plastic pipe, along the inner peripheral surface of the fluid conduit, and an apparatus used for performing the method.

[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 exposed part is not sealed, and the sealing property of the exposed part sometimes becomes 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 by paying attention to such actual situation, and a method for enabling the work of sealing the exposed portion, and
It is intended to provide a means for doing that work.

[0004]

A method of sealing a branch portion of a lining pipe according to the present invention includes a branch joint for forming a branch portion with respect to a fluid conduit, which is located closer to a tip side than a male thread portion for connection.
A male screw cylinder for tightening having a diameter smaller than the outer diameter is formed in advance, and a through hole for allowing the male screw cylinder for tightening of the branch joint to pass is formed in the lined plastic pipe. After that, a ring-shaped female screw body configured to be bendable and expandable so as to be able to pass through the through hole in a bent state and screwed to the tightening male screw cylinder portion of the branch joint in a deployed state. After being positioned in the plastic pipe via the through-hole, the through-hole is provided with a male screw cylinder portion for tightening the branch joint around the seal pipe and around the outer periphery of the plastic pipe. And then inserted into the plastic pipe, and then the ring-shaped female screw body is screwed and tightened on the tightening male screw cylinder portion to seal the branch portion.

The lining pipe branch part sealing device according to the present invention is a tightening device which is formed on the tip end side of the connecting male thread part of the branch joint for forming the branch part with respect to the fluid conduit and has a diameter smaller than its outer diameter. A male screw cylinder portion for attachment and a seal attached to the portion adjacent to the proximal end side of the male screw cylinder portion for tightening so as to be located around the male screw cylinder portion for tightening and outside the plastic pipe. A ring and a plastic pipe after lining, which is configured to be bendable so as to be able to pass through a through hole that allows the male screw cylinder portion for tightening of the branch joint to pass through, and for tightening the branch joint And a ring-shaped female screw body in which the female screw portion is formed in a ring shape in a deployed state so as to be deployable so as to be screwed to the male screw tubular portion.

[0006]

According to the method of the present invention, the ring-shaped female screw pre-positioned in the plastic pipe is different from the male screw cylinder portion for tightening of the branch joint which is located in the plastic pipe by passing through the through hole. The branch portion is sealed by screwing and tightening the body around the tightening male screw cylinder part while interposing a seal ring outside the plastic pipe. In addition, the male screw cylinder portion for tightening which is passed through the through hole and is located in the plastic pipe is a portion for opening the fluid branch passage in the branch portion.

According to the device of the present invention, the female threaded body can be pre-positioned in the fluid conduit by bending the annular female threaded body and passing it through the through hole. When the ring-shaped female screw body is expanded, the female screw body can be screwed to the tightening male screw portion of the branch joint. Therefore, according to the device of the present invention, sealing work of the branch portion, that is, pre-positioning in the fluid conduit with respect to the tightening male screw cylinder portion that has been passed through the through hole and positioned in the plastic pipe. It is possible to effectively perform the work of screwing and tightening the above-mentioned ring-shaped female screw body.

[0008]

As described above, according to the present invention, it is possible to seal the portion of the plastic pipe where the through hole is formed, and the conventional problem that the sealing is not performed at that portion is solved. Become so.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows one of the embodiments in which the branch portion of the lining pipe is sealed by the method of the present invention.
FIG. 4 shows the implementation process, and FIGS.
Shows the device of the invention used to carry out the method.

Reference numeral 1 in the figure is a metal fluid conduit (gas pipe) for guiding gas, and the inner peripheral surface of the fluid conduit 1 is made of polyethylene / vinyl chloride for the purpose of rehabilitating the pipe after long-term use. A plastic tube 2 made of a thermoplastic resin such as resin or polyester is lined. The lining is
Specifically, the plastic pipe 2 is provided inside the fluid conduit 1.
After the insertion, the inside of the plastic pipe 2 is pressurized and heated and expanded so that the plastic pipe 2 extends along the inner peripheral surface of the fluid conduit 1.

A branch portion is formed in the fluid conduit 1 where the fluid flow path needs to be branched.
The branch part is a male screw part 3 for connection on the tip side of the branch joint 3.
It is formed by forming a female screw hole 1a for screwing a into the fluid conduit 1 and screwing and fastening the connecting male screw portion 3a into the female screw hole 1a.

When the plastic pipe 2 is lined on the inner peripheral surface of the fluid conduit 1 in which the branch portion is formed as described above, if the plastic pipe 2 is left as it is, the fluid branch passage in the branch portion is closed. In this state, a through hole 2a is formed in the plastic pipe 2 at a position corresponding to the branching portion so as to open that portion.

The branch joint 3 is formed of a cylindrical body having a diameter smaller than the outer diameter of the branch joint 3 on the tip side of the male threaded portion 3a for connection on the tip side, and a ring-shaped female described later on the outer peripheral surface thereof. A tightening male screw cylinder portion 3b is provided, which is provided with a male screw that is screwed into the female screw of the screw body 4. The hole diameter of the through hole 2a formed at a position corresponding to the branch portion of the plastic pipe 2 is set to be slightly larger than the maximum diameter portion so that the tightening male screw cylinder portion 3b can be inserted. It is set.

The proximal end side of the tightening male screw cylinder portion 3b of the branch joint 3 (specifically, the tightening male screw cylinder portion 3b).
The circular groove 3 is formed on the circumferential end face portion adjacent to the root portion).
c is formed so as to open toward the tip side, and a seal ring 5 (specifically, an O ring) is attached to the annular groove 3c. The seal ring 5 is provided around the branch joint 3 and in the plastic pipe in a state where the connecting male screw portion 3a of the branch joint 3 is screwed into the female screw hole 1a of the fluid conduit 1. It will be located outside of 2.

The ring-shaped female screw body 4 is bendable so that it can pass through a through hole 2a formed in the plastic pipe 2 as shown in FIG. 2, and for tightening the branch joint 3. It is configured to be deployable so as to be screwed to the male screw cylinder portion 3b, and the female screw portion is formed in a ring shape in the deployed state. (See FIGS. 5 and 6)

As shown in FIGS. 5 and 6, the structure in which the ring-shaped female screw body 4 is bendable is formed by combining the ring-shaped female screw body 4 with a pair of half-split bodies 4A and 4B. The pair of half halves 4A, 4B are pivotally connected by a hinge connecting portion 6, and the hinge connecting portion 6 is foldable as a bending point. Incidentally, the hinge connecting portion 6
Is provided so as to fit inside the annular female screw body 4 so that the annular female screw body 4 and the annular female screw body 4 come into close contact with each other in the maximum bending posture. Then, on the surface opposite to the installation location, there are provided square groove portions 4a capable of engaging and locking the locking portions 71a, 72a of the annular female screw body operating tool 7 described below at four locations on the circumference. Has been formed.

As shown in FIGS. 3 and 4, the ring-shaped female screw body operating tool 7 comprises a combination of a pair of rod-shaped main bodies 71, 72, each of which has a generally U-shaped side surface. Handle portions 71b and 72b are provided at the base end portions of the rod-shaped main bodies 71 and 72, respectively. Locking portions 71a, 72a having a quadrangular cross section so as to be fitted and locked in the square groove portion 4a are provided at the respective tip portions of the pair of rod-shaped main bodies 71, 72 in the direction of the handle portions 71b, 72b. It is installed in a posture that faces. In addition, the pair of rod-shaped main bodies 7
One of the intermediate portions of the rods 1, 72 is formed into a rod shape, and the one intermediate portion is inserted into the other intermediate portion formed into a tubular shape so as to be rotatable and slidable in the longitudinal direction. ..
The intermediate portions of the pair of rod-shaped main bodies 71, 72 are connected to the locking portions 71a, 72a and the handle portions 71b, 72b.
The pair of rod-shaped main bodies 71 and 72 are slid in the longitudinal direction so that the handlebars 71b and 72b do not interfere with each other and the positions of the handle portions 71b and 72b are opposite to each other. Slide the parts in the opposite direction so that the two locking parts 71a, 72a and the two handle parts 71b,
72b are locked in a state in which they are not vertically displaced (for example, a groove is formed at an appropriate position of one rod-shaped main body 71, and the other rod-shaped main body 72 is fitted in the groove to be locked). , The annular female screw body operation tool 7
Is the posture in which the ring-shaped female screw body 4 is rotated.
The pair of rod-shaped bodies 71, 72 are slid in the longitudinal direction so that the locking portions 71a, 72a and the handle portions 71b, 72b do not interfere with each other, and the rod-shaped bodies 71, 72 are viewed from the side. The state in which the ring-shaped female screw body operating tool 7 is the most compact state, and in the compact state, the ring-shaped female screw body operating tool 7 is
As shown in FIG. 3, passage through the tightening male screw cylinder portion 3b on the tip side thereof is possible.

When carrying out the method of the present invention using the apparatus of the present invention, the ring-shaped female screw body 4 is bent and the ring-shaped female screw body 4 is positioned in the plastic pipe 2 via the through hole 2a. Let Then, the male screw portion 3a for tightening of the branch joint 3 is passed through the through hole 2a with the seal ring 5 being interposed around the male screw portion 3a and inside the plastic pipe 2. Position it. After that, the ring-shaped female screw body 4 is screwed onto the tightening male screw portion 3a and tightened to seal the branch portion. In the tightening work of the ring-shaped female screw body 4, the ring-shaped female screw body operating tool 7 is kept in the most compact state, and the tip side thereof is fixed to the male screw cylinder portion 3b for tightening.
After passing through the inside, the ring-shaped female screw body operating tool 7 is changed to the operating posture of the ring-shaped female screw body 4, and the locking portions 71a, 72a of the ring-shaped female screw body operating tool 7 in the operating posture are set as described above. This is done by operating the handle portions 71b and 72b while engaging with the square groove portion 4a of the ring-shaped female screw body 4.

Next, another embodiment will be described. In the above-described embodiment, the present invention is applied to the case where the branch portion of the lining pipe in which the fluid conduit for guiding the gas pipe is rehabilitated is sealed. For example, it can also be applied to the case of sealing a branch portion of a lining pipe in which a fluid conduit for guiding tap water is rehabilitated.

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

[Brief description of drawings]

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

FIG. 2 is a sectional view showing one step of the method of the present invention.

FIG. 3 is a sectional view showing the subsequent process.

FIG. 4 is a sectional view showing the subsequent process.

FIG. 5 is a perspective view showing a developed state of the annular female screw body.

FIG. 6 is a perspective view showing a bent state of the ring-shaped female screw body.

[Explanation of symbols]

 1 Fluid Conduit 1a Female Threaded Hole 2 Plastic Pipe 2a Through Hole 3 Branch Joint 3a Male Threaded Part for Connection 3b Male Threaded Cylinder for Tightening 4 Ring Female Threaded Body 5 Seal Ring

Claims (2)

[Claims] 1. A male screw portion (3) for connection of a branch joint (3).
a) is a female screw hole (1) formed on the fluid conduit (1) side.
After the plastic pipe (2) is inserted into the fluid conduit (1) which is screwed using (a) to form a branch portion, the plastic pipe (2) is inserted into the fluid conduit (1). ) Is a method for sealing a branch portion of a lining pipe, which is performed along the inner peripheral surface of (1), wherein the connecting male screw portion (3) is connected to the branch joint (3).
A male screw cylinder (3b) for tightening having a smaller diameter than the outer diameter thereof is formed in advance on the tip side of a), and the branch pipe (2) is attached to the lined plastic pipe (2). ) After the through hole (2a) for passing the tightening male screw cylindrical portion (3b) is bored, the branch joint (3) can be passed through the through hole (2a) in a bent state and in an expanded state. ) Tightening male screw cylinder (3
A ring-shaped female screw body (4) that is bendable and expandable so as to be screwed into b) is positioned in the plastic pipe (2) via the through hole (2a), and A sealing ring (5) is provided around the male screw cylinder (3b) for tightening of the branch joint (3) and around the plastic pipe (2).
After passing through the through hole (2a) and being inserted into the plastic pipe (2), the ring-shaped female screw body (4) is screwed into the tightening male screw cylinder part (3b). A method for sealing a branched portion of a lining pipe, which seals the branched portion by wearing and tightening. 2. A male screw portion (3) for connection of the branch joint (3).
a) is a female screw hole (1) formed on the fluid conduit (1) side.
For a fluid conduit (1) which is screwed using a) to form a branched portion, a plastic pipe (2) inserted into the fluid conduit (1) is removed except for a portion corresponding to the female screw hole (1a). A branch pipe sealing device for a lining pipe, in which the inner peripheral surface of the fluid conduit (1) is lined by closely contacting the inner peripheral surface of the fluid conduit (1), the male thread portion (3a) for connection of the branch joint (3). ), And a plastic pipe (2) around the tightening male screw cylinder part (3b), which is formed on the tip end side in a smaller diameter than the outer diameter thereof. ), The seal ring (5) is attached to a portion adjacent to the proximal end side of the tightening male screw cylinder portion (3b), and the plastic pipe (2) after lining is bored. A through hole (through which the male screw cylinder (3b) for tightening of the branch joint (3) passes. It is bent freely configured to pass through a), and the branch connection (3 male threaded tube portion for tightening) (3
A branch portion sealing device for a lining pipe, comprising a ring-shaped female screw body (4) configured to be deployable so as to be screwed to b) and having a female thread portion formed in a ring shape in a deployed state.