JP2781588B2 - Pipe lining method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a pipe lining method for forming a lining tube inside a pipe by inserting a lining tube impregnated with resin into the tube pressure by fluid pressure.

[Conventional technology]

As a method of rehabilitating pipes such as water pipes, sewer pipes, and oil supply pipes, there is a pipe lining method (generally called an in-situ form (INS) method) as shown in FIGS. . 5 to 7, reference numeral 1 denotes a pipe buried in the ground (existing pipe), and this pipe 1 is cut at both ends in shafts 2, 2 formed in the ground. Reference numeral 3 denotes a lining tube inserted into the tube 1. The lining tube 3 is composed of, for example, a felt impregnated with a thermosetting resin and a film adhered to the outer surface of the felt.

When such a lining tube 3 is inserted into the pipe 1, first, as shown in FIG. 5, the lining tube 3 wound around a reel 4 is placed on a tube holding ring 5 provided on the upper part of the shaft 2. The tube is passed through the inside, and the tip is inverted (inverted) between the inner surface and the outer surface, and fixed to the tube holding ring 5. Next, after the lining tube 3 is inserted from the shaft 2 into the opening of the pipe 1, water is supplied from the water supply pump 6 into the lining tube 3 via the water supply hose 7. At this time, the reel 4 is in a locked state. When the water supplied to the lining tube 3 reaches a predetermined water level, the locked state of the reel 4 is released, and the lining tube 3 is gradually fed out from the reel 4. In this case, since the water pressure acts on the lining tube 3, the lining tube 3 inserted into the pipe 1 is pushed and expanded by the water pressure, and the inner surface of the lining tube 3 is moved outward as shown in FIG. While being pressed against the inner wall of the tube 1 and inserted into the tube 1. A guide member 8 is provided in the shaft 2 on the side where the lining tube 3 is inserted. The guide member 8 guides the lining tube 3 into the tube 1.

In this way, the lining tube 3 is invertedly inserted into the tube 1, and when the lining tube 3 reaches the end of the tube 1 as shown in FIG. Water is supplied to the boiler 10 via a hot water circulation hose 9, and hot water from the boiler 10 is supplied into the lining tube 3 via a hot water supply hose 11 connected to the rear end of the lining tube 3. Then, the water in the lining tube 3 is heated to a predetermined temperature (80 ° C.) with warm water circulated and supplied from the boiler 10.
9090 ° C.) and maintain this state for a certain period of time.
By doing so, the thermosetting resin impregnated in the lining tube 3 is cured by the hot water heat from the boiler 10,
A lining tube is formed inside the tube 1. After the impregnated resin of the lining tube 3 is cured, the hot water in the lining tube 3 is cooled and drained, and then the lining tube 3 exposed outside the tube 1 is separated from the lining tube 3 in the tube 1. Then, the pipe 1 is connected to the separated pipe 1 via a connection pipe.

[Problems to be solved by the invention]

By the way, in such a pipe lining method, since the thermosetting resin impregnated in the lining tube 3 is heated to a predetermined temperature (80 to 90 ° C.) to be cured, it takes time until the resin is cured. There is a problem. Therefore, in order to solve this problem, a method of curing the resin using a curing agent or a catalyst activated at room temperature (20 to 30 ° C.) has been considered. However, such a curing method has a problem that the resin is cured before the lining tube 3 is invertedly inserted into the tube 1 because the curing agent or the catalyst must be blended in the resin.

The present invention has been made in view of the above circumstances, and makes it possible to easily cure a resin by simply applying heat at a temperature slightly higher than room temperature, and to use a method of lining a pipe that forms a lining pipe in a short time. To provide.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides a method of lining a tube, in which a lining tube impregnated with a thermosetting resin is formed inside the tube to form a lining tube. Using the lining tube made of a resin containing microcapsules to be mixed, the tip of the lining tube is inverted, the inside of the lining is fixed near one end of the tubing, and fluid pressure is fed to the tubing to feed the tubing. After inserting the capsule upside down to the other end of the tube while sequentially pressing the end side against the inner wall of the tube, the capsule is broken by applying heat, ultrasonic wave, light or the like at a temperature higher than the normal temperature and 50 ° C. or less. Then, a method of lining a pipe for lining the lining tube by curing the resin.

[Action]

In the present invention, a hardener or a catalyst activated at room temperature is encapsulated in microcapsules that can be broken by heat slightly higher than room temperature, so that the resin is not cured and the microcapsules are blended in the resin. Tubes can be created. Then, as in the conventional case, the tip of the lining tube is inverted, and the inside of the tube is fixed to the vicinity of one end of the tube and the fluid pressure is fed in, whereby the rear end of the tube is sequentially pressed against the inner wall of the tube. Insert while flipping. Thereafter, if the microcapsules incorporated in the resin are broken using heat, ultrasonic waves, light, or the like at a temperature slightly higher than room temperature, the hardener or catalyst can be hardened at room temperature, and the inside of the tube is removed. The lining tube can be formed in a short time without going through a special process.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 to 4, the same parts as those in FIGS. 5 to 7 are denoted by the same reference numerals,
The description of that part is omitted. It goes without saying that the method for rehabilitating the pipe and the lining method are the same as those in FIGS. 5 to 7.

FIG. 1 shows a cross section in the longitudinal direction of the lining tube, and FIG. 2 shows a cross section along the line II-II in FIG. As shown in FIGS. 1 and 2, the lining tube 3 is composed of a bag-shaped felt 12 and a film 13 adhered to the outer surface of the felt 12 by means such as fusion. The felt 12 is impregnated with a thermosetting resin and microcapsules 14. The microcapsules 14 are slightly higher than room temperature (40-50
C), the capsule is broken, and a curing agent (or catalyst) that is activated at room temperature (20 to 30 C) is enclosed therein.

FIG. 3 is a view showing a state in which the lining tube constructed as described above is inverted and inserted into the pipe in accordance with the lining method shown in FIGS. 5 to 7, and FIG. 4 is a diagram showing water in the lining tube by a boiler 10 or the like. It is a figure showing the state where it heated to a temperature slightly higher than normal temperature. As shown in FIGS. 3 and 4, the microcapsules 14 are broken when the water in the lining tube 3 is heated to a temperature slightly higher than room temperature by a boiler or the like after the lining tube 3 is inverted and inserted into the tube 1 by water pressure. I do.
As a result, the curing agent (or catalyst) encapsulated in the microcapsules 14 is mixed with the resin, so that the resin can be cured at a temperature higher than normal temperature and at 50 ° C. or less, that is, at the breaking temperature of the capsule 14. As a result, a lining pipe can be formed inside the pipe 1 in a short time.

In the above embodiment, the microcapsules 14 containing the curing agent (or catalyst) activated at room temperature are broken by heat. However, the microcapsules 14 are irradiated with ultrasonic waves (pressure) or light.
May be destroyed. Further, in the above-described embodiment, the case where the lining tube 3 is applied to the method of inverting and inserting the lining tube 3 into the pipe 1 by water pressure is described. It is needless to say that the present invention can also be applied to a method of inverting and inserting into a hole.

〔The invention's effect〕

As described above, according to the present invention, a pipe lining method for inserting a lining tube impregnated with a thermo-effective resin into a pipe by fluid pressure and curing the resin to form a lining pipe inside the pipe is provided. In, a curing agent or a catalyst activated at room temperature is microencapsulated and blended into the resin, and after inserting the lining tube upside down into the tube, the capsule is heated at a temperature slightly higher than room temperature by heat, ultrasonic wave or light. Since the resin is broken and cured, the resin impregnated in the lining tube can be cured with a curing agent or a catalyst activated at room temperature, and the lining tube is placed inside the tube by a special operation process. And can be formed in a short period of time.

[Brief description of the drawings]

1 to 4 show one embodiment of the present invention.
Fig. 1 is a longitudinal sectional view of the lining tube, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, Fig. 3 is a view showing a state where the lining tube is invertedly inserted into the tube, and Fig. 4 is a lining. FIG. 5 is a view showing a state in which water in a tube is heated to a predetermined temperature, and FIG. 5 to FIG. 7 are views showing a conventional and a pipe lining method of the present invention. 1 ... tube, 2 ... shaft, 3 ... lined tube, 4 ...
Reel, 5 ... Tube holding ring, 6 ... Water supply pump, 7 ... Water supply hose, 8 ... Guide member, 9 ... Hot water circulation hose, 10 ... Boiler, 11 ... Hot water supply hose, 12
… Felt, 13… Film, 14… Microcapsules.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Honma Nippon Kokan Co., Ltd. 1-2-1, Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Shintaro Ikeda 347-44 Unomori, Sagamihara City, Kanagawa Prefecture (72) Invention Kazuhiro Takasu 516 Shirane-cho, Asahi-ku, Yokohama City, Kanagawa Prefecture (72) Inventor Kiyoshi Kodama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-55-152024 (JP, A) JP-A-1-200934 (JP, A) JP-A-64-27636 (JP, A) JP-A-59-33766 (JP, U) JP-B-55-43890 (JP, B2) JP-B-58 −39546 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 F16L 55/16-55/18 F16L 1/00

Claims (1)

(57) [Claims] 1. A method of lining a tube in which a lining tube impregnated with a thermosetting resin is formed on the inside of the tube to form a lining tube, wherein a microscapsule containing a curing agent or a catalyst activated at room temperature is compounded. Using the lining tube made of resin, the tip of the lining tube is inverted and fixed near the one end side of the tube, and the fluid pressure is fed to sequentially press the rear end side of the tube against the inner wall of the tube. After inverted insertion to the other end of the tube, the capsule is heated at a temperature higher than the normal temperature, and at a temperature of 50 ° C. or less, broken by applying heat, ultrasonic waves or light, and cured by curing the resin. A pipe lining method characterized by lining a lining tube.