JPH03189126A - Lining technique - Google Patents

Abstract

PURPOSE:To stick reliably a synthetic resin pipe on the inside of an existing pipe, by a method wherein a lining material constituted of the resin pipe whose form is changed so that a section becomes small and a heat-resistant film tube covering the resin pipe is pulled into the existing pipe while holding the lining at a temperature range of the resin pipe under a softened state, a film tube is pulled out and an expanding jig is pressure-fed within the resin pipe. CONSTITUTION:A lining material 2 is constituted of a resin pipe 3 which is formed of thermoplastic resin and changed its form so that a section becomes small and a heat-resistant film tube 4 covering the resin pipe 3. When the lining material 2 is inserted into an existing pipe 1 through a pulling-out port 10 of a sealing part 8, the resin pipe 3 of the lining material 2 is softened with a temperature of the inside of the existing pipe 1 and the lining material 2 is arranged by running along a form of the existing pipe 1. Then when pressurizing water is fed through a pressurizing water feed port 7 while pulling out the film tube 4 through a pulling out port 10 of the sealing part 8 and an expanding jig 11 is pressure-fed within the lining material 2, a pressing part 3a of the resin pipe 3 which is in a softened state is expanded outside with the pressing force of the expanding jig 11 and the resin pipe 3 can be stuck completely on the inside of the existing pipe 1 without an adhesive agent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lining method that is applicable to all existing pipes such as sewerage, water supply, and oil pipes, and in particular to improving the adhesion of synthetic resin pipes to existing pipes. .

[Conventional technology] In recent years, for the purpose of reinforcing the strength of existing pipes such as sewerage and water supply pipes, preventing corrosion, preventing water leakage and flooding, and improving flow rate,
Inversion lining methods that line the inner surface of existing pipes with synthetic resin or form synthetic resin on the inner surface of existing pipes are attracting attention.

For example, Japanese Patent Publication No. 55-43890, Japanese Patent Application Publication No. 64-
The construction method disclosed in Publication No. 85738 is to invert and advance a lining material in which a needle felt layer is impregnated with a liquid thermosetting resin such as epoxy or polyester within an existing pipe using fluid pressure, and then move the inverted lining material to the existing pipe using fluid pressure. This is a method of lining the existing pipe inner surface with synthetic resin by crimping it onto the inner surface of the pipe and curing the thermosetting resin.

Also, JP-A-64-16633, JP-A-64-1
The construction method disclosed in Publication No. 6634 or Japanese Unexamined Patent Publication No. 63-286395 involves inserting a small-diameter thermoplastic pipe into an existing pipe, and then heating and pressurizing the thermoplastic pipe from the inside to expand it. This is a method of bringing it into close contact with the surface.

Furthermore, the construction method disclosed in European patent EPO 1843fi6/11 involves inserting a spirally wound thin synthetic resin plate into an existing pipe while making it into a spiral shape with a winder (pipe making machine), and then inserting it into an existing pipe as a lining material. The space in the existing pipe is filled with grout material.

[Problems to be Solved by the Invention] The lining material used in the conventional inversion construction method, as typified by Japanese Patent Publication No. 55-43890, is such that the liquid thermosetting resin impregnated into the needle felt layer does not form the inverted surface when inverted in the existing pipe. It moves within the felt layer due to the non-uniform pressing force in the circular direction. For this reason, there is a difference in the amount of resin impregnated in the cross-sectional direction of the felt layer, which has the disadvantage of causing not only variation in thickness but also variation in strength.

In addition, especially when using a long lining material, it is necessary to roll up or fold the flexible lining material impregnated with liquid resin after the impregnation process in order to store it. At this time, variations in thickness occur in each part of the lining material due to differences in dead weight or pressing force, and a difference in environmental pressure is applied to the liquid resin. If a synthetic resin pipe is formed using a lining material in such a state, variations in thickness and strength will occur.

Further, it is very difficult to uniformly impregnate the entire length of the flexible bag with liquid resin, and a variation of ±15% usually occurs, making it impossible to form a uniform synthetic resin pipe.

Also, misalignment or loss of branch pipes or joints of existing pipes.

If there are voids such as cracks, the liquid resin around these voids will seep into the void due to the pressing force of the existing pipe after being turned over, reducing the strength around the void. It also had the disadvantage that it would flow out together with underground water due to the decrease in viscosity, forming a porous impregnated layer and significantly reducing its strength.

In addition, the lining material impregnated with thermosetting resin is heated and cured after being turned over and molded.
- Approximately 15% when polyester resin is used for the lining material.
It takes time. Furthermore, even a quick-drying type of epoxy resin takes about 6 to 8 hours, which is a disadvantage in that it takes a long time to process. This is also due to the fact that heat is accumulated in the existing pipes and the surrounding soil during the long heating retention period, which slows down the cooling rate.

Also, JP-A-64-16633, JP-A-64-1
In order to heat, soften, and expand a thermoplastic resin pipe that has been processed into a smaller cross-sectional shape than the existing pipe diameter, as in the construction method disclosed in Publication No. 6634 or Japanese Unexamined Patent Publication No. 63-285395, it is necessary to The difference in elongation rate under pressure is large, and when heated, it becomes an amorphous state, and the self-expansion force is small, so it is necessary to forcibly elongate and expand the pipe using external pressure. It is necessary to heat all parts evenly under the same pressure. but,
In reality, the disadvantages are that the heating temperature varies, wrinkles occur in the resin tube, variations in tube thickness occur, and gaps are created between the tube and the existing tube.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 63-285395,
When a small-diameter pipe is forcibly stretched and crimped with a big pipe that has softened on the outside of the inner surface of a curved pipe, the outside pipe thickness becomes thinner than the other parts, which is a drawback.

Furthermore, as disclosed in the European patent EPO184366Al, the method of inserting into an existing pipe while manufacturing the pipe is
This method has the disadvantage that it cannot be inserted into existing pipes that have significant meandering, or the diameter of the pipe must be made smaller, resulting in a large reduction in cross-sectional area relative to the diameter of the existing pipe.

This invention was made in order to solve these shortcomings, and the object thereof is to propose a lining method that can reliably adhere a synthetic resin pipe to the inner surface of an existing pipe without using adhesives or the like. It is.

[Means for Solving the Problems] The lining method according to the present invention uses, as a lining material for existing pipes, a resin pipe made of thermoplastic resin whose shape has been changed to reduce the cross-sectional area, and a heat-resistant film covering the resin pipe. This is a construction method that uses a lining material consisting of a tube.2 The lining material is drawn into the existing pipe while maintaining the temperature of the lining material within the temperature range of the softened state of the resin pipe, the film tube is pulled out from the existing pipe, and one end of the existing pipe is pulled out. The feature is that the expansion jig is force-fed into the resin vibrator from the inside.

[Function] In this invention, a lining material consisting of a resin vibrator made of thermoplastic resin whose shape has been changed to reduce the cross-sectional area and a heat-resistant film tube covering the resin vibrator is used as the lining material. The softened resin vibe is inserted into the existing pipe by pulling the tensile strength film tube into the existing pipe while maintaining the material at the softening temperature of the resin vibe.

In this way, since the resin vibrator in a softened state is inserted into the existing pipe while being supported by the film tube, the lining material can easily pass through bends.

While or after pulling out this film tube, the expansion jig is force-fed to the softened lining Murayama, and the shape of the resin vibrator is adjusted while expelling air and accumulated water between the existing pipe and the lining material. Recover. [Example] In Figures 1(a) and 1(b), which are process diagrams showing a lining method according to an embodiment of the present invention, l represents an existing pipe;
2 is the lining material.

The lining material 2 is made of a thermoplastic resin and consists of a resin vibrator 3 whose shape has been changed so that its cross-sectional area is small, and a heat-resistant film tube 4 that covers the resin vibrator 3. This lining material 2
As shown in the processing diagram in Figure 2, for example, vinyl chloride and polyethylene.

Thermoplastic synthetic resins such as polypropylene and bolybdenum,
Extrusion molding is performed so that the outer diameter is 90 to 105% of the inner diameter of the existing pipe l to form a resin vibrator 3 with a length longer than the existing pipe line length.Next, the resin vibrator 3 is heated to a softening temperature. For example, vinyl chloride is softened in a heated atmosphere with a heat processing temperature of 80 to 10°C, and mechanical methods such as forming rollers and extrusion slits are used to make the cross-sectional area smaller than the cross-sectional area of the existing pipe. Flatten or fold. Then, a flattened and bent resin vibrator 3 as shown in FIGS. 2(b) and 2(C) is formed. After forming the resin vibrator 3 with a reduced cross-sectional area, the heat deformation temperature under load is higher than the softening temperature of the thermoplastic resin while maintaining the softened state, for example, the heat deformation temperature under load is 160 DC (4,
6Kgf/cg+”l nylon aluminum is 135°G
(4.6 Kgf/am'') of polyester film or the like, or a film tube 4 made of a film containing reinforcing fibers, to form a lining material 2 as shown in FIG. 2(d).

5 is a sealing part attached to one end of the existing pipe l;
The sealing part 5 has a heating water supply port 6 sent from a heating boiler (not shown) and a pressurized water supply lower to which the sealing part is attached and supplies pressurized water.

8 is a sealing part attached to the other end of the existing pipe l;
The sealing part 8 has a heated water outlet 9 to which a safety valve 91 is attached, and a pull-out opening 10 to which a sealing part is attached, into which the lining material 2 is inserted and the film tube 4 is pulled out.

11 is an expansion jig, and the expansion jig 11 is made of, for example, a polyethylene vig. 12 is a speed control lobe attached to the rear end of the expansion jig 10.

Next, the operation when forming a synthetic resin pipe on the inner surface of the existing pipe 1 using the lining material 2 formed as described above will be explained.

First, the sealing part 5 and the sealing part 8 containing the expansion jig 11 are attached to both ends of the existing pipe 1 to bring the existing pipe 1 into a nearly sealed state.Next, heated water is continuously supplied from the sealing part 5. While supplying and discharging the supplied heated water from the heated water outlet 9 of the sealing part 8, the temperature inside the existing pipe 1 is maintained at the softening state temperature of the resin vibrator 3 forming the lining material 2.

In this state, the lining material 2 is inserted into the existing pipe l through the extraction port 10 of the sealing part 8, as shown in FIG. 1(a). Existing pipe l
As the lining material 2 is inserted inside, the resin vibe 3 of the lining material 2 is softened by the temperature inside the existing pipe 1, and the lining material 2 is disposed along the shape of the existing pipe 1.

After placing the lining material 2 inside the existing pipe l, the supply of heated water sent from the supply port 6 of the sealing part 5 is stopped, and the sealing part 8
While pulling out the film tube 4 from the pull-out opening 10,
Pressurized water is supplied from the pressurized water supply port 7 of the sealing part 5, and the first
As shown in Figure (b), the expansion jig 11 is forced into the lining material 2. At this time, the speed control rope 12 is controlled in conjunction with the withdrawal of the film tube 4 so that the rear end 4a of the film tube 4 is always located at the tip of the expansion jig 11.

Due to the pressure feeding of the expansion jig 11, the pressing part 3a of the resin pipe 3 which is in a softened state is expanded outward by the pressing force of the expansion jig 11, and the air existing between the existing pipe l and the resin pipe 3 is removed. The shape of the resin vibe 3 is restored while sending out water.

Since the original outer diameter of this resin vibrator 3 is formed to be 90 to 105% of the inner diameter of the existing pipe 1, the resin vibrator 3
can be completely attached to the inner surface of the existing pipe without adhesive.

At this time, the heated water in front of the pressing portion 3a is discharged from the heated water outlet 9 according to the pressure of the expansion jig 11.

After the resin vibrator 3 is brought into close contact with the entire inner surface of the existing pipe 1 in this manner, cooling water is supplied instead of pressurized water to cool the resin vibrator 3, thereby forming a synthetic resin pipe within the existing pipe 1.

Thereafter, the sealing portion 5.8 and the expansion jig 11 are removed, and post-processing such as cutting both ends of the formed synthetic resin tube is performed to complete the process.

In addition, although the above embodiment has been described for the case where the existing pipe l is a straight pipe, the present invention can also be applied in the same manner as in the above embodiment even if the existing pipe l has a bent portion 14 as shown in FIG. can.

Even if there is such a bent part 14, when the lining material 2 is drawn into the existing pipe l, the resin vibe 3 of the lining material 2 will soften due to the temperature inside the existing pipe l, and the lining material 2 will become flexible. Therefore, the lining material 2 can be disposed according to the shape of the bent portion 14 without resistance.

Furthermore, by pressing the lining material 2 with the expansion jig 11, it is possible to prevent the formation of air pockets 15 in the bent portion 14 as shown in FIG. Can be made smaller.

In addition, in the above embodiment, heated water was supplied into the existing pipe 1 to maintain the ambient temperature of the existing pipe 1 at the softening temperature of the resin vibe 3, but the film tube 4 of the lining material 2
The lining material 2 may be inserted into the existing pipe 1 while the resin vibrator 3 is maintained at a softening temperature by supplying heating fluid such as steam.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention. As shown in FIG. Material 2
Insert. At this time, heating fluid such as heated water and heated steam sent from a heating boiler (not shown) is continuously supplied into the film tube 4 from the rear end of the lining material 2 . The supplied heating fluid softens the resin vibrator 3 while passing through the film tube 4, and is discharged into the existing pipe 1 from the drainage hole 23 provided at the tip 21.

By pulling the resin vibrator 3, which has been softened by this heating fluid, with the tensile strength film tube 4,
Even when inserting the lining material 2 into the existing pipe l having the bent portion 14, it can be inserted without deforming the resin vibrator 3 and with small resistance.

Further, in the embodiment shown in FIG. 5, if the buoyancy of water is utilized, insertion of the lining material 2 and withdrawal of the film tube 4 can be made easier.

For example, when the existing pipe 1 is a horizontal pipe, as shown in FIG. 6, weirs 24 are provided at both ends of the existing pipe 1 to fill water 25 inside the existing pipe 1. The distal end 21 is tied with a traction band 22 to this existing pipe 1, and the lining material 2 to which heating fluid is continuously supplied is inserted into the film tube 4 from the rear end. At this time,
Since the buoyant force of water 25 acts on the lining material 2, the traction band 2
2, the lining material 2 can be drawn into the existing pipe l without resistance.

When pulling out the film tube 4 after inserting the lining material 2, tie the traction band 22 only to the tip of the film tube 4, restrain the rear end of the resin vibrator 3 so that it is not pulled in, and pull out the film tube 4. At this time, the buoyancy of the water 25 acts on the lining material 2, so the film tube 4 can be pulled out with little resistance. In this way, by utilizing buoyancy, only the film tube 4 is pulled out first and only the resin pipe is expanded, or the resin pipe 3 is pressed with the expansion jig 11 while the film tube 4 is being pulled out.

Although the embodiment shown in FIG. 6 has been described in the case of horizontal piping, it can be similarly applied to the case of three-dimensional piping having a bent portion 14 by filling it with water.

In addition, in the embodiment shown in FIG. 6, a case has been described in which the lining material 2 is inserted after filling the existing pipe 1 with water 25. Even if the lining material 2 is inserted with the traction band 22 and the film tube 4 is pulled out after the heated fluid 25 to be released is stretched into the existing pipe 1, the same effect as in the above embodiment can be obtained.

Further, in the above embodiment, the case where the lining material 2 was maintained at the softening temperature of the resin pipe 3 by heating fluid was explained.
A heating element such as a nichrome wire is embedded in the film tube 4 of the lining material 2 to maintain a predetermined temperature by electrical heating, or a heating hose with a plurality of holes for passing heating fluid or a heating hose embedded with a heating element is inserted into the resin pipe 3. It may also be provided to maintain a predetermined temperature.

In addition, when a heating hose is provided inside the resin vibrator 3,
The heating hose may be pulled out at the same time as the film tube 4.

[Effects of the Invention] As explained above, this invention uses, as a lining material, a resin pipe made of thermoplastic resin whose shape has been changed to reduce the cross-sectional area, and a film tube that covers the resin pipe. Since this lining material is held in the softened state of the resin pipe and then drawn into the existing pipe, the shape of the softened resin pipe can be suppressed by the film tube while being drawn into the existing pipe, making it possible to maintain the softened state of the resin pipe and draw it into the existing pipe. Even if it is, the lining material can be placed with small resistance according to its shape.

In addition, while pulling out the film tube, or by pulling out only the film tube first, the expansion jig is pumped into the softened resin tube to remove air and accumulated water between the existing pipe and the resin tube. Since a synthetic resin pipe is formed by sending out and restoring the shape of the resin pipe to its original shape, the synthetic resin pipe can be completely attached to the existing pipe without using an adhesive or the like. Therefore, flooding and water leakage can be prevented.

In addition, after forming the resin pipe to the correct thickness, it is flattened and stored and transported in a solid state, so there is no variation in thickness or strength during storage, and the formed synthetic resin pipe has a uniform thickness and uniformity. It becomes stronger and can significantly improve quality.

In addition, since synthetic resin pipes can be formed inside existing pipes without using adhesives, there is no need for hardening time for adhesives, etc., so there is no heat accumulation in the soil, and cooling time is extremely short, and existing pipes can be easily installed. Since only surface preparation is required, construction time can be significantly shortened. In addition, the rate of reduction in the cross-sectional area of the pipe after lining is small, and construction can be carried out even if there is significant meandering.Furthermore, there is no need for adhesive attachment equipment or attachment work, so construction costs can be reduced. I can do it.

[Brief explanation of drawings]

Figures 1 (a) and (b) are process diagrams showing the construction process of the embodiment of this invention, Figure 2 is a process diagram showing the processing process of the lining material used in the above embodiment, and Figure 3 is a process diagram showing the construction process of the embodiment of the present invention. FIG. 4 is a partial sectional view of FIG. 3, FIG. 5 is a sectional view of the third embodiment, and FIG. 6 is a sectional view of the fourth embodiment. 1... Existing pipe, 2... Lining material, 3... Resin pipe, 4... Film tube, 5.8...
- Sealing part, 6... Supply port, 7... Pressurized water supply port, 9... Heated water discharge port, 10... Pulling out port, 11
...Expansion jig, 12...Speed control lobe, 22
... Traction belt, 23 ... drainage hole, 24 ... weir.

Claims (1)

[Claims] A synthetic resin pipe is installed on the inner surface of an existing pipe using a lining material made of thermoplastic resin and consisting of a resin pipe whose shape has been changed to reduce the cross-sectional area and a heat-resistant film tube that covers the resin pipe. This method involves drawing the lining material into the existing pipe while maintaining the temperature of the lining material within the temperature range of the softened state of the resin pipe, then pulling out the film tube and expanding it from one end of the existing pipe into the resin pipe. A lining method characterized by pressure-feeding materials.