JPH0516337B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for disposing a lining material applied to the inner surface of a pipe such as a sewer pipe into the pipe as a pre-lining operation.

[Conventional technology]

As a method of lining the inner surface of a pipe such as a sewer pipe, a tube-shaped lining material made of an uncured UV-curable or thermosetting synthetic resin is placed inside the pipe, and then the lining material is applied by a predetermined means such as supplying air. There is a method of pressing the lining material against the inner surface of the tube by inflating it, and then hardening the lining material by irradiating ultraviolet rays or heating. When deploying lining material into a pipe using this method, especially when applying it to the inner surface lining of a small-diameter pipe that cannot be accessed by people, conventionally the lining material is pulled into the pipe while sliding on the inner surface of the pipe, and then The above-mentioned prescribed lining work was being carried out.

[Problem that the invention seeks to solve]

However, the lining material used in the above lining method is generally a mixture of UV-curable or thermosetting polyester resin with glass fiber (hereinafter referred to as FRP), and the uncured material is soft. It is easy to tear. Therefore, when pulling the lining material into the pipe while sliding it on the inner surface of the pipe as described above, a large tensile force is required to resist the frictional force, and there is a risk that the lining material may stretch or tear during the process. There are probably many. Furthermore, if there are irregularities or protrusions inside the pipe, the lining material may get caught on these irregularities or protrusions and break. This tendency is remarkable when the lining material is made long enough to cover a long range of the inner surface of the tube.

The present invention solves these problems,
To efficiently deploy a lining material into a pipe without causing stretching or tearing even if the lining material is made of a material that is easily stretched or torn, and to perform prescribed lining work without any hindrance after deployment. With the goal.

[Means for solving problems]

While supplying air from the tip of the lining material or the mantle tube containing the lining material and squeezing it with a roller to prevent the air from escaping at the rear, the lining material or the lining material is poured into the water that has spread inside the approximately horizontal tube. The gist is that after inserting the mantle tube containing the liquid into the tube while floating from its tip, the water inside the tube is drained.

[Effect]

Since the lining material floating on water easily moves on the water surface, the above means allows the lining material to be easily inserted into the pipe. Therefore, no large tensile force is applied to the lining material during insertion into the pipe. Furthermore, since the lining material is floating on water, the lining material will not get caught on unevenness or protrusions inside the pipe.

〔Example〕

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

Figure 1 shows the initial state when the lining material 2 is inserted into the sewer pipe 1, which is an example of a pipe, Figure 2 shows the state immediately before the insertion of the lining material 2 is finished, and Figure 3 shows the interior of the pipe after the lining material 2 has been inserted. This shows the state where the water has been drained.

Prior to inserting the lining material 2, water is filled into the inside of the sewer pipe 1, and this water is, for example, provided inside the sewer pipe 1 with a weir 3, and is constantly injected into the upstream side of this weir 3. This is done either by overflowing from dam 3 or by letting sewage overflow from dam 3. The area to be filled with water should include the entire length of the area to be lined. A squeezing roller 5 is installed at the entrance/exit of a manhole 4a leading to the sewer pipe 1, and an air supply hose 6 from an air supply source (not shown) is led through the entrance/exit of another manhole 4b. is connected to the tip of the tube-shaped lining material 2. From this state, air is supplied to the lining material 2 through the air supply hose 6, thereby inflating the lining material 2.
The tip of the pipe is floated on the water W inside the sewer pipe 1 as shown in Fig. 1. In this way, the lining material 2 is easily inserted into the sewer pipe 1 while floating on the water W by the water flow. In this case, it goes without saying that the lining material 2 is sequentially fed into the sewer pipe 1. When the lining material 2 is inserted floating on water in this manner, no frictional force is generated, and even if there are irregularities or foreign objects in the pipe, the lining material 2 easily overcomes them.

When the entire lining material 2 is inserted into the sewer pipe 1 as shown in Fig. 2, the feeding of the lining material 2 is stopped, the weir 3 is removed to drain the water in the pipe, and the lining material 2 is inserted into the sewer pipe 1 as shown in Fig. 3. 2 is placed on the bottom of the sewer pipe 1. Through the above steps, the lining material 2 is placed inside the pipe. After this, move on to the lining work.

Lining material 2 is FRP made of UV-curable or thermosetting polyester resin mixed with glass fiber.
Consists of tubes. Uncured FRP like this
Since it is sticky and lacks ease of handling, it is desirable to maintain protective films 2a and 2b on both its inner and outer surfaces to improve its ease of handling, as shown in FIG. When the lining material 2 is directly floated on water as described above, it is necessary to use a water-insoluble material such as polyethylene terephthalate (PET) as the protective films 2a and 2b. In this way, the protective films 2a, 2
If b is maintained, when the lining material 2 is squeezed by the squeezing roller 5, it is also prevented from sticking together in a lump shape.

The lining work is performed, for example, according to the following procedure. That is, as shown in FIG.
0 and connect the air supply hose 11 to one box 10.
is connected, and air is supplied from this air supply hose 11 to inflate the lining material 2, thereby pressing the lining material 2 against the inner surface of the sewer pipe 1. If the lining material 2 is UV-curable, the lining material 2 is then cured by irradiating the lining material 2 with UV rays while running the UV irradiation device 12, which has been installed in the box 10 in advance, inside the lining material 2. let Next, the remaining ends of the lining material 2 that protrude from the sewer pipe 1 and protrude into the manholes 4a, 4b are cut off. When the lining material 2 is installed on the inner surface of the sewer pipe 1 in this way, the
As shown in the figure, the lining material 2 is held in close contact with the inner surface of the sewer pipe 1. When the lining material 2 is UV-curable as described above, the protective film 2a on the inner surface of the lining material 2 described in FIG. 7 is made colorless and transparent, while the protective film 2b on the outer surface is made white. Then, after the ultraviolet rays irradiated from the ultraviolet irradiation device 12 pass through the lining material 2, they are reflected by the protective film 2b and irradiate the lining material 2 again, so the amount of light irradiating the lining material 2 increases. This has the advantage that the lining material 2 hardens in a short time, allowing the lining work to be carried out quickly.

On the other hand, when the lining material 2 is thermosetting, a heater may be provided inside the lining material 2 instead of the above-mentioned ultraviolet irradiation device to heat and harden the lining material 2.

In the above embodiment, the tube-shaped lining material is inserted into the pipe while directly floating on water, but in this case, the lining material is inserted into the outer tube, and the outer tube is floated on the water inside the pipe. It may be inserted into the sewer pipe together with the lining material.

This method will now be described with reference to FIG.

FIG. 8 shows the state immediately before the insertion of the lining material 2 is finished.

In this embodiment, the lining material 2 is inserted into the sewer pipe 1 while being wrapped in a water-impermeable outer tube 7 as shown in FIG. The method of filling the sewer pipe 1 with water before inserting the lining material 2 and the mantle tube 7, and the fact that a squeezing roller 5 is installed at the entrance and exit of the manhole 4a are also similar to those described above. An air supply hose 6 introduced into the sewer pipe 1 through another manhole 4b is connected to the tip of the mantle tube 7. When air is supplied through the air supply hose 9 from this state, the mantle tube 3 expands and floats on the water stretched inside the sewer pipe 1. Therefore, the mantle tube 7 is connected to the sewer pipe 1.
, the outer tube 7 containing the lining material 2 is inserted into the sewer pipe 1 by the water flow. When the mantle tube 3 is inserted while floating on water in this manner, no frictional force is generated, and even if there are irregularities or foreign objects in the tube, the mantle tube 7 can easily overcome them. From the beginning, lining material 2 was made from mantle tube 7.
It is inserted into the sewer pipe 1 together with the mantle tube 7. Therefore, the squeezing roller 5 squeezes the lining material 2 as well as the mantle tube 7.

When the entire lining material 2 has been inserted into the sewer pipe 1, the feeding of the mantle tube 7 is stopped and the weir 3
is removed to drain the water inside the pipe, and then the mantle tube 7 is cut at a predetermined location, and the mantle tube 7 with the lining material 2 still in it is placed on the bottom of the sewer pipe 1. Through the above steps, the lining material 2 is placed inside the pipe. After this, move on to the lining work.

When the lining material 2 is placed in the mantle tube 7 and inserted into the sewer pipe 1 in this way, the lining material 2 does not come into contact with water, so a water-soluble material with good releasability is used as a protective film for the lining material 2. It is also possible to use poval (PVA). The lining work is carried out in the same manner as described above.

FIG. 10 shows yet another embodiment method. That is, weirs 3, 3 are provided at the upstream and downstream ends of the sewer pipe 1 to be lined, and water is filled by injecting water W between the weirs, so that there is no water flow. In this method, a cable body 13 such as a wire or string is fixed to the tip of the lining material 2 floating on water W,
The lining material 2 is inserted into the sewer pipe 1 by winding up the cable body 13 with a winch 14. In this way, there is no need to create a water flow, and it is only necessary to inject water into the inner surface of the sewer pipe 1 to be lined. Even with this method, no frictional force is generated, and the lining material 2 is not caught by irregularities or foreign objects inside the pipe.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the lining material is inserted into the pipe while floating on water, so the lining material gets caught on irregularities or foreign objects inside the pipe, causing it to tear or stretch. There is no fear and it can be easily and reliably placed inside the pipe. In particular, when the lining material is long, the friction between the lining material and the inner surface of the pipe is extremely reduced when it is inserted while floating on water, so the conventional method of inserting the lining material while sliding it on the inner surface of the pipe is not recommended. It is very effective in comparison.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are schematic sectional views for explaining the embodiment of the method of the present invention, Figure 4 is a schematic sectional view for explaining the lining work, and Figure 5 is a schematic sectional view for explaining the lining work. A schematic cross-sectional diagram showing a sewer pipe,
6 is an enlarged sectional view taken along line A-A in FIG. 5, FIG. 7 is a partial sectional view showing the lining material, FIG. 8 is a schematic sectional view for explaining another embodiment, and FIG. 9 8 is an enlarged sectional view taken along line BB in FIG. 8, and FIG. 10 is a schematic sectional view for explaining still another embodiment. 2...Lining material, 1...Sewage pipe, W...
water.

Claims (1)

[Claims] 1. While supplying air from the tip of the lining material or the mantle tube containing the lining material and squeezing it with a roller to prevent air from escaping at the rear, insert the lining material or lining material into the water in the approximately horizontal tube. A method for disposing a lining material in a pipe, the method comprising: inserting the mantle tube containing the material into the pipe while floating from its tip, and then draining the water inside the pipe.