JPH08127069A - Lining of inner surface of pipe - Google Patents

Abstract

PURPOSE: To perfectly dispense with the troublesome filling work of a back- filling material while improving execution properties though the inner surface of a pipe is lined with thermoplastic resin short cylindrical elements and to prevent the penetration or leakage of water from the connection parts of the short cylindrical elements. CONSTITUTION: Thermoplastic resin short cylindrical elements having an outer diameter slightly smaller than the inner diameter of a pipe 1 are inserted in a pipe while fitted and connected each other and, after an expansible hermetically closed tube 4 into which a heating fluid supply hose 3 is introduced is inserted in the short cylindrical elements 2, a high temp. heating fluid is discharged into the hermetically closed tube 4 from the discharge holes of the hose 3 to expand the hermetically closed tube 4 so as to bring the same into contact with the inner surfaces of the short cylindrical elements. The short cylindrical elements 2 are heated by the heat of the heating fluid and the inner pressure of the hermetically closed tube 4 is increased when the short cylindrical elements 2 are thermally softened to further expand the tube 4 and the short cylindrical elements 2 are expanded from the inside by the hermetically closed tube 4 to be bonded to the inner surface of the pipe under pressure to complete lining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of lining an inner surface of an existing pipe such as a sewer pipe or other pipes with a short cylinder of a thermoplastic resin.

[0002]

2. Description of the Related Art As one of the methods for lining the inner surface of a sewer pipe or the like, a thermoplastic resin short tube is connected and inserted into the tube, and a backfill material is provided in the gap between the inner surface of the tube and the short tube. Filling lining methods are known.

[0003]

However, in the above lining method, the work of filling the backfill material is troublesome and the workability is poor, and a defective filling portion of the backfill material is apt to occur, and the connecting portion of the short cylinder body is likely to occur. There was a problem such as water infiltrating or leaking from it.

The present invention has been made in view of the above problems, and an object of the present invention is that the troublesome filling work of the backfill material is not necessary at all and the workability is good, and the water from the connecting portion of the short tubular body is not used. It is to provide a lining method capable of preventing infiltration and leakage.

[0005]

In order to achieve the above object, the lining method of the present invention is to insert into a pipe while fittingly connecting a short cylinder of a thermoplastic resin having an outer diameter smaller than the inner diameter of the pipe, Insert an inflatable closed tube that penetrates the heating fluid supply hose into the short tube, and then release the hot heating fluid into the closed tube through the discharge hole of the hose. The short tube is heated by the heat of the heating fluid while being expanded so that it contacts the inner surface of the body, and when the short tube is thermally softened, the internal pressure of the sealed tube is increased to further expand the tube and seal the short tube. It is characterized in that it is spread from the inside with a tube and pressed against the inner surface of the tube.

Preferably, high-temperature steam is used as the heating fluid, and a ring-shaped waterproof packing made of water-expandable resin is attached to the fitting connection portion of the short tubular body.
The ridges that mesh with each other are provided around the outer peripheral surface of the insertion port at one end of the short tubular body and the inner peripheral surface of the receiving port at the other end.

[0007]

In the lining method of the present invention, the short cylinder of the thermoplastic resin inserted into the pipe after being fitted and connected is softened by the heat of the heating fluid supplied to the closed tube, and the internal pressure of the closed tube is increased. Since the body is pushed out from the inside and pressed against the inner surface of the pipe, the short cylindrical body and the inner surface of the pipe are in close contact with each other and no gap is formed. Therefore, the troublesome work of filling the backfill material is completely unnecessary, and the workability is greatly improved.

When high-temperature steam is used as the heating fluid, the temperature can be easily controlled and the temperature of the short cylinder can be raised in a short time to be thermally softened, so that the workability is further improved. .

Further, when the heat-softened short cylinder is pressed against the inner surface of the pipe with a closed tube, the fitting connection part of the short cylinder also comes into close contact with the pressure and welds to some extent, so that water intrudes from the connection part. It will be difficult. In particular, when a ring-shaped waterproof packing made of water-expandable resin is attached to the fitting connection part, the waterproof packing expands due to contact with water and closes the fitting connection part of the short tubular body. Intrusion and leakage can be reliably prevented.

Further, if a convex strip is provided around the outer peripheral surface of the insertion port at one end of the short tubular body and the inner peripheral surface of the receiving port at the other end, the convex strip is fitted when the short tubular body is fitted and connected. Since they mesh with each other, there is no fear of disconnection of the short cylinder during the work of inserting the short cylinder into the pipe.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are sectional views showing an embodiment of a lining method according to the present invention in accordance with a construction procedure, FIG. 5 is a sectional view of a short cylinder, and FIG. 6 is a portion of a fitting connection portion of the short cylinder. FIG.

According to this embodiment, first, as shown in FIG. 1, a short tube body 2 of a thermoplastic resin having an outer diameter smaller than the inner diameter of the sewer pipe 1 is fitted and connected, and a ring made of a water-expandable resin. A waterproof packing (not shown) is attached to the fitting connection portion of the short tubular body 2, and the short tubular body 2 is inserted into the pipe from one end of the sewer pipe 1. The short cylinder 2 is formed by molding a thermoplastic resin such as polyethylene or polyvinyl chloride into a short cylinder. As shown in FIG. 5, one end of the short cylinder 2 has a thin insertion port 2a.
Is formed, and a thin receiving port 2b is formed at the other end. Then, on the outer peripheral surface of the insertion port 2a and the inner peripheral surface of the receiving port 2b, there are circumferentially provided ridges 2c having a saw-tooth cross section that mesh with each other. Therefore, when the insertion port 2a of the next short tubular body 2 is fitted and connected to the receiving port 2b of the short tubular body 2, the ridges 2c can be engaged with each other so that they cannot be pulled out. There is no risk of disconnection of the short tube 2 during the work of inserting the short tube 2 into the sewer pipe 1.

After the insertion of the short tubular body 2, as shown in FIG. 2, an expandable closed tube 4 having a hose 3 for supplying steam is inserted into the short tubular body 2. The closed tube 4 is formed by sealing both ends of a soft, inflatable tube made of heat-resistant polyurethane, polyester, nylon or the like, which is reinforced with fibers, and is slightly longer than the sewer pipe 2. To be done. In addition, this hose 3 is attached to the inside of the closed tube 4,
A large number of discharge holes (not shown) for discharging water vapor are formed. One end of the hose is connected to the air supply pump 5, and the pressure regulating valve 6 and the muffler muffler 7 are attached to the other end of the hose.

When the insertion of the closed tube 4 is completed, the steam of high temperature (about 120 ° C.) generated in the boiler 8 is sent to the hose 3 by the air supply pump 5, and the steam is discharged into the closed tube 4 from the discharge hole of the hose 3. The short tube 2 is discharged and expanded so that the closed tube 4 contacts the inner surface of the short tube 2, and the short tube 2 is heated by the heat of steam. At this stage,
Since it suffices to bring the closed tube 4 into contact with the inner surface of the short tubular body 2, the tube inner pressure is set to 0.3 kg /
The pressure may be set as low as about cm ² .

When the short tubular body 2 is softened by the heat of steam, the pressure regulating valve 6 is adjusted to adjust the internal pressure of the closed tube 4 to 1.0.
By increasing the pressure to about kg / cm ² and further expanding the closed tube 4 to push the short tube 2 out from the inside as shown in FIG. 3, the short tube 3 is pressed against the inner surface of the sewer pipe 1. When the pressure contact is made in this manner, as shown in FIG. 6, the insertion connection 2a and the reception connection 2b of the short tubular body 2 are brought into close contact with each other and welded to some extent, and the waterproof packing 9 is connected to the connection portion. To close the fitting connection part. Therefore, the short tubular body 2
There is no need to worry about water entering or leaking from the mating connection part of.

When the pressure contact of the short tubular body 2 to the inner surface of the sewer pipe 1 is finished, the supply of steam by the air supply pump 5 is stopped and at the same time the set pressure of the pressure regulating valve 6 is increased to keep the sealed tube 4 at the above internal pressure. The short tubular body 2 is naturally cooled and solidified as it is.
Then, when the short tube body 2 is sufficiently solidified, the air in the closed tube 4 is discharged through the hose 3, the closed tube 4 is shrunk, and the closed tube or hose is extracted from the short tube body 2 as shown in FIG. Complete the construction.

Although high-temperature steam is used as the heating fluid in the above embodiment, it goes without saying that high-temperature air or the like may be used instead.

[0019]

As is apparent from the above description, the lining method of the present invention eliminates the troublesome filling work of the backfill material, so that the workability is greatly improved, and the inner surface of the pipe is efficiently and surely. There is a remarkable effect that can be lined with a short cylinder of thermoplastic resin. When high temperature steam is used as the heating fluid, the temperature can be easily controlled and the short cylinder can be heated and softened in a short time, so that the working efficiency is further improved and the short cylinder is fitted. If a ring-shaped waterproof packing made of water-expandable resin is attached to the connection part, it is possible to reliably prevent water from entering or leaking from the mating joint part. When ridges are provided around the outer peripheral surface of the mouth and the inner peripheral surface of the receiving end at the other end, there is also the effect that there is no risk of disconnection of the short cylinder during the work of inserting the short cylinder into the pipe. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a short tubular body of a thermoplastic resin is inserted into a pipe while being fitted and connected in a method for lining a pipe inner surface according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a closed tube penetrating a hose is inserted inside a short tubular body in the lining method of the same example.

FIG. 3 is a cross-sectional view showing a state in which a short tube body obtained by expanding and softening a sealed tube is pressed against the inner surface of the tube in the lining method of the example.

FIG. 4 is a cross-sectional view showing a state in which the lining of the inner surface of the pipe is completed.

FIG. 5 is a cross-sectional view of a short tubular body used in the same example.

FIG. 6 is a partial cross-sectional view of a fitting connection portion of a short tubular body.

[Explanation of symbols]

 1 pipe (sewage pipe) 2 short tube of thermoplastic resin 2a insertion port 2b receiving port 2c convex line 3 hose 4 hermetically sealed tube 9 waterproof packing

Claims (4)

[Claims] 1. A short cylinder of an inflatable closed tube which is inserted into the pipe while fittingly connecting a short cylinder of a thermoplastic resin having an outer diameter smaller than the inner diameter of the pipe, and through which a hose for supplying heating fluid is passed. After inserting into the body, the hot heating fluid is discharged through the discharge hole of the hose into the closed tube, and the closed tube is expanded so as to contact the inner surface of the short cylinder, and the heat of the heating fluid causes the short cylinder to expand. When the body is heated and the short tubular body is heat softened, the internal pressure of the closed tube is increased to further expand the tube,
A method for lining the inner surface of a pipe, wherein the short tubular body is spread from the inside by a closed tube and pressed against the inner surface of the pipe. 2. The lining method according to claim 1, wherein the heating fluid is high-temperature steam. 3. The lining method according to claim 1, wherein a ring-shaped waterproof packing made of water-expandable resin is attached to the fitting connection portion of the short tubular body. 4. The lining method according to claim 1, wherein the outer peripheral surface of the insertion port at one end of the short tubular member and the inner peripheral surface of the receiving port at the other end are provided with protruding ridges that mesh with each other. .