JPS6044123B2 - Resin lining method for buried pipes - Google Patents

Description

[Detailed description of the invention] This invention relates to a method for lining buried pipes with resin.

A cylindrical felt impregnated with a thermosetting resin liquid is folded into a flat shape and introduced into underground pipes such as sewage pipes, water pipes, gas pipes, and other fluid pipes. There is a known method of lining the buried pipe with thermosetting resin by pressurizing air into the pipe to inflate it into a cylindrical shape so that it adheres tightly to the inner wall of the pipe, and then leaving it to stand or blowing hot air to harden the resin liquid. (Unexamined Japanese Patent Publication No. 49-1199)
(See Publication No. 71). In the above-mentioned known method, air is inflated into a cylindrical shape by injecting air into a flat felt whose both ends are sealed, so that the flat felt is expanded all at once over its entire length. Therefore, when the felt is inflated,
There was a problem in that water and air in the buried pipe remained between the inner wall of the buried pipe and the outer surface of the cylindrical felt, and as a result, the hardening felt was not sufficiently fixed to the inner wall of the buried pipe.
In order to solve the above-mentioned problem, the present invention is such that the flat felt is gradually inflated from the air injection side. That is, the present invention involves flattening a laminated sheet with an endless cross section consisting of a felt impregnated with a thermosetting resin liquid and a plastic film superimposed on at least the inner surface of the felt, and introducing the flattened sheet into a buried pipe. The laminated sheet is passed through a gap between two sealing devices in the width direction that are placed close to each other, and while fluid is being press-fitted from one end of the laminated sheet, the sealing device is moved to the other end to fluid-press the laminated sheet. A method and method for lining a buried pipe with resin, which is characterized in that the thermosetting resin is inflated into a cylindrical shape from one side to the other end to make it tightly adhere to the inner wall of the buried pipe, and then the thermosetting resin is cured.Embodiments of the present invention To explain this using drawings, Fig. 1 is a cut front view of a flat laminated sheet, in which an inner polyethylene film 2 is placed on the inner surface of a felt 1 impregnated with a thermosetting resin liquid, and an outer polyethylene film is placed on the outer surface. 3 is stacked on top of each other to form an endless cross-section.

In Figure 2, 4 is a buried pipe, 5 is a rear manhole, and 6 is a buried pipe.
is the front manhole, and 7 is the flat laminated sheet A mentioned above.
The rear end of the joint pipe 7 is connected to the flange 8.
A press-fit pipe 9 is connected to the flange 8 and opened. The front end of the flat laminated sheet A is sealed,
Lobe 10 is connected. FIG. 3 shows an example of the sealing device 11 used in the present invention, in which a skate-shaped base leg 12 with a front portion 12a curved slightly upward, a front support rod 13,
A rear support rod 14, which is longer than the front support rod 13, is erected, a front roller 16 is mounted on a bearing 15 attached to the upper end of the front support rod 13, a bearing 17 is attached vertically to the upper end of the rear support rod 14, Rear roller 1 in two stages, upper and lower, with a gap at 18
9 and 20 are installed rotatably.

As shown in FIG. 4, the sealing device 11 is arranged so that the gap between the rear rollers 19 and 2 is located slightly below the horizontal center line of the buried pipe 4, and is perpendicular to the axial direction of the buried pipe 4. And it is arranged on the lower half wall of the buried pipe 4 so as to be horizontal. The sealing device 11 is then pulled forward by the pulling lobe 21 coupled to the front portion 12a of the base leg 12 and moved in the direction of arrow P. In the above structure, the front end of the flat laminated sheet A is introduced from the rear manhole 5, the lobe 10 connected to the front end of the flat laminated sheet A is pulled from the front manhole 6 side, and the flat laminated sheet A is inserted into the front side. On the bottom wall of the buried pipe 4 between the rear manholes 5 and 6. Stretch it along and place it.

At this time, the sealing tool 11 is located at the rear of the buried pipe 4, and the flat laminated sheet A is passed through the gap formed between the rear rollers 19 and 20 of the sealing tool 11, and comes into contact with the lower surface of the front roller 16. It is placed on the bottom wall of the buried pipe 4 (this state is not shown). Next, air of 0.2 to 0.3 k9/Clt (cage pressure) is press-fitted from the press-fit pipe 9 connected to the flange 8 of the joint pipe 7, and the front manhole of the tension lobe 21 connected to the front end of the sealing device 11 is injected. 6 and gradually move it to the front manhole 6 by pulling it in the direction of arrow P, the portion A1 of the flat laminated sheet A passed through the gap between the rear rollers 19 and 20 is expanded by the rear rollers 19 and 20. is obstructed, and is sealed by the pressing force when the lower rear roller 19 moves in the direction of arrow P. As shown in FIG.
The portion of the laminated sheet up to 0 is expanded by the above-mentioned pressurized air, and a cylindrical laminated sheet B that is in close contact with the inner wall of the buried pipe 4 is formed. When the sealing member 11 is moved to the front end of the flat laminated sheet A, the cylindrical laminated sheet B is brought into close contact with the entire inner wall of the buried pipe 4. Next, hot air of 30 to 70° C. is blown into the cylindrical laminated sheet B from the press-fit tube 9 to harden the thermosetting resin liquid impregnated in the felt 1, and the inner wall of the buried tube 4 is lined with the thermosetting resin. Thereafter, the front and rear parts of the cylindrical laminated sheet B are cut as appropriate, and the process of lining the buried pipe 4 is completed. The expansion of the flat laminated sheet A is inhibited by the gap between the rear rollers 19 and 20, but the positional relationship between the front roller 16 and the lower rear roller 19 is such that the flat laminated sheet A is In the portion A1 that contacts the upper surface of the roller 19, the portion A1 is sealed by the pressure contact force when the sealing tool 11 is moved in the direction of arrow P,
The pressurized air press-fitted into the cylindrical laminated sheet B from the portion A1 must not leak into the flat laminated sheet A in front.

However, the structure of the sealing member 11 is not limited to the above embodiment. For example, if the gap between the rear rollers 19 and 20 is made small to prevent pressurized air from leaking into the flat laminated sheet A in front, the front roller 16 may be used. May be omitted. Furthermore, the rear rollers 19 and 20 may be provided in parallel in the horizontal direction.
Further, flanges may be provided at both ends of the front roller 16 and rear rollers 19, 20 to prevent the flat laminated sheet A from coming off the ends of the rollers when the sealing member 11 moves forward. Furthermore, the front and rear bearings 15 and 17 may be configured so that they are not supported by a single bracket whose upper surface is inclined forward and downward, and the support rods 13 and 14 may be omitted. The flat laminated sheet A is manufactured by a known method, but
The plastic film on its outer surface may be omitted.

However, if the outer plastic film is omitted, the thermosetting resin liquid impregnated into the felt tends to adhere to other objects, so care must be taken when handling it. Further, after the cylindrical laminated sheet B is fixed to the inner wall of the buried pipe 4, the inner plastic film 3 may be peeled off and removed. As explained above, in the method of the present invention, a cylindrical laminated sheet is formed while moving the sealing tool, so air and water are not likely to remain between the outer surface of the cylindrical laminated sheet and the inner wall of the buried pipe. As a result, the thermosetting resin lining on the inner wall of the buried pipe can be made stronger.

[Brief explanation of drawings]

FIG. 1 is a cut front view of a flat laminated sheet, FIG. 2 is a cut side view for explaining this invention, FIG. 3 is a perspective view showing an example of a sealing device used in this invention, and FIG. 4 2 is a front view taken along the line ■-■ in FIG. 2. 1: felt, 3: inner plastic film, 4: buried pipe, 11: sealing tool, 19, 20: rear roller, 21: tension lobe, A: flat laminated sheet, B: cylindrical laminated sheet.

Claims (1)

[Scope of Claims] 1. A laminated sheet with an endless cross section consisting of felt impregnated with a thermosetting resin liquid and a plastic film overlaid on at least the inner surface of the felt is flattened and introduced into a buried pipe, The flat laminated sheet is passed through a gap between two sealing devices in the width direction that are placed close to each other, and while fluid is injected from one end of the laminated sheet, the sealing device is moved to the other end to seal the laminated sheet. A method for lining a buried pipe with resin, which comprises inflating it into a cylindrical shape from a fluid injection side toward the other end to bring it into close contact with the inner wall of the buried pipe, and then hardening the thermosetting resin. 2. The method for lining a buried pipe with resin according to claim 1, wherein the plastic film is a polyethylene film. 3. The method for lining a buried pipe with resin according to claim 1 or 2, wherein a plastic film is superimposed on both sides of the felt. 4. The method for lining a buried pipe with resin according to any one of claims 1 to 3, wherein the fluid press-fitted into the flat laminated sheet is air.