JPH06241379A - Lined tube branch sealing method - Google Patents

Abstract

PURPOSE:To eliminate generation of any corrosion, etc., in a fluid conduit by forcing a sealing resin into a clearance formed between a lined tube and the fluid conduit before a through-hole is drilled in the tube so as to seal the branch part of the tube. CONSTITUTION:The connecting male thread 3a of a branch joint 3 is screwed into the female thread hole 1a of a fluid conduit 1 so as to form the branch part of a pipe line. After a plastic system tube 2 is inserted into the fluid conduit 1, a through-hole 2a is drilled in a tube 2 in its area matching its branch part so as to open the branch part. A sealing resin A is forced into a clearance formed between the lined tube 2 and the fluid conduit 1 through the female thread hole 1a before the through-hole 2a is drilled in order to seal the branch in such a line tube. Thus the branch of the tube 2 is sealed to eliminate the generation of any corrosion, breakage, etc., in the fluid conduit 1.

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, a male screw portion for connection of a branch joint is screwed into a female screw hole formed in a fluid conduit to form a pipe line. After inserting the plastic tube into the fluid conduit that is designed to form the bifurcation of
A lining pipe in which the plastic tube is in an open state by arranging the plastic tube along the inner peripheral surface of the fluid conduit and forming a through hole at a position corresponding to the branch portion in the plastic tube. In the above, the present invention relates to a method for sealing a branched portion of a lining pipe for sealing the branched portion.

[0002]

2. Description of the Related Art A plastic tube such as a polyethylene tube, a polyvinyl chloride tube, or a polyester tube is provided on the inner peripheral surface of a fluid conduit as a means for rehabilitating a fluid conduit that has been used for a long time to introduce a fluid such as gas or water. Is being implemented. For the lining, for example, after inserting the plastic tube into the fluid conduit, the interior of the plastic tube is pressurized and expanded by heating, so that the plastic tube extends along the inner peripheral surface of the fluid conduit. Done by. 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 in advance, and The branch portion is formed by screwing and fastening the male screw portion for connection to the female screw hole. In a fluid conduit having such a branch portion, when the plastic tube is lined on the inner peripheral surface of the fluid conduit, the fluid branch passage in the branch portion is not opened when the plastic tube is lined, so that portion is opened. In order to do so, a through hole has been formed at a location corresponding to the branch portion of the plastic tube.

[0003]

In the state where the plastic tube is lined on the inner peripheral surface of the fluid conduit, the plastic tube is simply laid along the fluid conduit from the inside, and between the both. Is in a non-bonded state. Therefore, in the place where the through hole is formed in the plastic tube, 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. Since there is no suitable technique to do so, the sealing property at that part may become a problem. For example, if corrosion or breakage occurs in any part of the fluid conduit and a pipe inside / outside penetration portion is generated in that portion, the fluid flowing in the fluid conduit will not adhere to the pipe inside / outside penetration portion. There is a problem in that it may leak to the outside of the tube via the portion and the exposed portion. 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 branch portion of a lining pipe according to the present invention, a male screw portion for connection of a branch joint is screwed into a female screw hole formed in a fluid conduit to form a pipe line. For a fluid conduit that is designed to have a branch,
After inserting a plastic tube into the inside, along the plastic tube along the inner peripheral surface of the fluid conduit, by forming a through hole at a location corresponding to the branch portion in the plastic tube,
In the lining pipe in which the branch portion is in an open state, a method of sealing the branch portion of the lining pipe for sealing the branch portion, before the work of forming the through hole,
It is characterized in that the branch portion is sealed by press-fitting a seal resin through the female screw hole into a gap formed between the lined plastic tube and the fluid conduit.

The sealing resin may be press-fitted by pushing the sealing resin positioned in the female screw hole toward the gap side with a plug temporarily screwed into the female screw hole. .

[0006]

According to the method of the present invention, since the seal resin is press-fitted into the gap through the female screw hole before the through hole is formed, in the press-fitting process, the plastic tube corresponds to the branch portion. The through hole does not yet exist at the location. Therefore, in the press-fitting process, the unpenetrated portion of the plastic tube corresponding to the branch portion becomes a wall in the press-fitting path of the seal resin, and the press-fitting path of the seal resin is changed to the gap side. As a result, the sealing resin can effectively enter the gap without moving to the inside of the plastic tube, so that the sealing of the branch portion is effective even after the through hole is formed. Will be done.

[0007]

Therefore, according to the method of the present invention, it is possible to realize the sealing of the branch portion (that is, the place where the through hole is formed) in the plastic tube, and the sealing is not performed at that portion. The conventional problems will be solved.

In the case of performing the press-fitting operation of the sealing resin by pushing the sealing resin located in the female screw hole to the gap side with the plug temporarily screwed into the female screw hole, Only by preparing a plug that can be screwed into an existing female screw hole in the conduit and screwing the plug into the female screw hole, the sealing resin can effectively enter the gap. The work of press-fitting the sealing resin can be performed at low cost and with good workability.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the method of the present invention, in which 1 is a fluid conduit (gas pipe) for guiding gas.

In the fluid conduit 1, a branch portion is formed at a position where the fluid flow path needs to be branched, and the branch portion is a male screw portion 3a for connection on the tip side of the branch joint 3.
A female screw hole 1a for screwing is formed in the fluid conduit 1 in advance, and the connecting male screw portion 3 is inserted into the female screw hole 1a.
It is formed by screwing and fastening a (see FIG. 1).

When the fluid conduit 1 is used for a long period of time and needs to be rehabilitated, a plastic tube 2 such as a polyethylene tube, a polyvinyl chloride tube or a polyester tube is lined on the inner peripheral surface of the fluid conduit 1. (See Figure 2). Specifically, the lining is made by inserting the plastic tube 2 into the fluid conduit 1 and then pressurizing and expanding the inside of the plastic tube 2 so that the outer peripheral surface of the plastic tube 2 is fluidized. It is performed by lining the inner peripheral surface of the conduit 1.

Fluid conduit 1 in which such a branch portion is formed
On the other hand, when the plastic tube 2 is lined on the inner peripheral surface, if the plastic tube 2 is left as it is, the fluid branch passage in the branch portion is closed. Therefore, in order to open that portion, a through hole 2a (FIG.
However, in the method of the present invention, before the work of forming the through hole 2a, the lining between the plastic tube 2 and the fluid conduit 1 is formed. The branch portion is sealed by press-fitting the seal resin A into the gap formed in the above via the female screw hole 1a.

The press-fitting operation of the seal resin A is specifically carried out as described below. First, the branch joint 3 in which the male screw portion 3a for connection is screwed into the female screw hole 1a in the fluid conduit 1 is removed from the fluid conduit 1 by releasing the screwing. Next, the fluid conduit 1 is inserted into the female screw hole 1a after the branch joint 3 is removed.
A sealing resin A (for example, a two-liquid mixed epoxy resin, silicone resin, urethane resin, or the like) having good adhesion between the plastic tube 2 and the plastic tube 2 is supplied and positioned (see FIG. 3). Then, as shown in FIG. 3, the plug 4 that can be screwed into the female screw hole 1a in which the seal resin A is located is screwed into the female screw hole 1a from above, so that the seal resin A is removed. As shown in FIG. 5, the sealing resin A is pushed into the gap between the plastic tube 2 and the fluid conduit 1 to press it into the gap via the female screw hole 1a. The work of press-fitting the sealing resin A by screwing in the plug 4 is performed a plurality of times (for example, three times) as necessary. afterwards,
After forming the through hole 2a, a female thread extending over the fluid conduit 1 and the plastic tube 2 is threaded if necessary, and further, a branch joint 3 (the joint 3 thereof) is formed at a portion where the female thread is threaded. Replace it with a new one if necessary)
The male threaded portion 3a for connection is screwed on, and the branch joint 3 is attached to the fluid conduit 1 to complete the work (see FIG. 5).

According to such a method of the present invention, the through hole 2
Since the seal resin A is press-fitted into the gap via the female screw hole 1a before the a is bored, in the press-fitting process, the through hole 2 is formed in the plastic tube 2 at a position corresponding to the branch portion.
a does not exist yet. Therefore, in the press-fitting process,
The portion of the plastic tube 2 corresponding to the unbranched branch portion serves as a wall in the press-fitting path of the seal resin A, and the press-fitting path of the seal resin A is changed to the gap side. As a result, the sealing resin A effectively enters the gap without moving to the inside of the plastic tube 2, and thus the sealing of the branch portion is effective even after the through hole 2a is formed. Will be done.

Next, another embodiment will be described. In the embodiment described above, the plug 4 which can be screwed into the female screw hole 1a of the fluid conduit 1 is used to press-fit the seal resin A, but such a plug 4 cannot be prepared. At times, the press-fitting operation may be performed using another jig for press-fitting the seal resin (or manually).

In the above-described embodiment, the present invention was applied to the case of sealing the branch portion of the lining pipe in which the fluid conduit for guiding the gas pipe was rehabilitated, but the present invention rehabilitated another fluid conduit. It can also be applied in the case of sealing a lining pipe, for example, 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 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 cross-sectional view showing an existing pipeline as a target for implementing the method of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the pipe line is lined for pipe rehabilitation.

FIG. 3 is a sectional view of an essential part showing a process of an embodiment of the method of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing the subsequent process.

FIG. 5 is a sectional view of an essential part showing the subsequent process.

[Explanation of symbols]

 1 Fluid Conduit 1a Female Threaded Hole 2 Plastic Tube 2a Through Hole 3 Branch Joint 3a Male Threaded Part 4 Plug A Seal Resin

Claims (2)

[Claims] 1. A male screw portion (3) for connection of a branch joint (3).
a) is a female screw hole (1a) formed in the fluid conduit (1)
The plastic tube (2) is inserted into the inside of the fluid conduit (1) which is screwed to the pipe to form a branched portion of the conduit, and then the plastic tube (2) is inserted. A state in which the branched portion is opened by being provided along the inner peripheral surface of the fluid conduit (1) and by forming a through hole (2a) at a position corresponding to the branched portion in the plastic tube (2). A method for sealing a branched portion of a lining pipe for sealing the branched portion, wherein the plastic tube (2) subjected to the lining before the work of forming the through hole (2a) is performed. ) And the fluid conduit (1), the branching of the lining pipe for sealing the branching section is performed by press-fitting the sealing resin (A) through the female screw hole (1a) into the gap formed between the branching line and the fluid conduit (1). Part sealing method. 2. The sealing resin (A) is press-fitted into the female screw hole (1a) by a plug (4) which is temporarily screwed into the female screw hole (1a). The method for sealing a branch portion of a lining pipe according to claim 1, which is performed by pushing (A) toward the gap side.