JPH0347730A - Lining material for reverse lining - Google Patents

Abstract

PURPOSE:To obtain lining material for reverse lining by a method wherein resin pipe, which is made of shape memory resin so as to have an outer diameter larger than the inner diameter of existing tube, is softened in the heating atmosphere, the temperature of which is higher than the shape restoring temperature and lower than the shape memory temperature of the resin, and flattened and, after that, inserted in film tube, which is made of material having thermal deformation temperature under load higher than the shape memory temperature of the resin, and finally reeled up or folded up for producing the lining material concerned. CONSTITUTION:While being softened in the heating atmosphere, the temperature of which is lower than the shape restoring temperature of resin pipe 1, the resin pipe 1 is flattened mechanically so as to make its cross-section smaller than the cross-section of a existing tube in order to form a worked pipe 1a, 1b or 1c. After that, the worked pipe 1a held under its softened state is inserted in film tube, the thermal deformation temperature under load of which is higher than the shape memory temperature of shape memory resin, so as to produce lining material 3. After being wound spirally or folded up, the lining material 3 is cooled down below its shape restoring temperature and stored. When the formation of synthetic resin pipe onto the inner surface of the existing tube by the worked lining material is intended, the tip of the lining material 3, the resin pipe 1 in which is turned under softened state, is passed through a feeding port 5 and a heat insulation hose 6 so as to fix to a fixing part 7 in such a manner that the film tube 2 is turned inside in order to turn the lining material 3 inside out by means of the pressure of pressurized water.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lining material used in an inverted lining method that can be applied to sewerage, water supply, oil pipes, and all other existing piping, particularly to improving adhesion to existing piping. It is.

[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. In this method, the inner surface of the existing pipe is lined 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 method disclosed in Publication No. 6634 or Japanese Unexamined Patent Publication No. 63-285395 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.

[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.

Moreover, especially when using a long lining material, it is necessary to roll 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.

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

Also, the joints of the limb pipes in the existing pipes are misaligned or missing.

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. Another drawback was that the clay would flow out together with underground water, forming a porous impregnated layer and significantly reducing its strength.

In addition, the lining material impregnated with thermosetting resin is molded by heating and curing after inversion, and the total time of heating time and cooling time during heating and curing is, for example, 300 nn+ in diameter and 6 in thickness.
It takes about 15 hours when polyester resin is used as the lining material for IIIl. 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.

Further, when the thermosetting resin is heated and cured, shrinkage occurs in the longitudinal direction and the circumferential direction of the lining layer.

This shrinkage created gaps between the existing pipes and the lining layer, which also had the disadvantage of causing water intrusion and leakage.

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 amorphous and has no self-expansion force, so it must be forcibly elongated and expanded by external pressure. It is necessary to heat all parts evenly under the same pressure. However, in reality, the heating temperature varies and wrinkles may occur in the resin tube.
In addition to causing variations in pipe thickness, it also had the disadvantage of creating gaps between the pipe and the existing pipe.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 63-285395,
When a pipe that has softened on the outside of the inner surface of a curved pipe is forcibly stretched and crimped with a small-diameter Vig, there is no shrinkage in the softened state, so the outside part becomes thinner than other parts, and the stretched part on the inside becomes thinner. It has the disadvantage that it wrinkles on the downstream side in the direction of travel.

This invention was made to solve these shortcomings, and the object is to obtain a lining material for inversion lining that can be reliably lined on the inner surface of an existing pipe without using liquid resin or the like. .

[Means for Solving the Problems] The lining material for inversion lining according to the present invention heats a resin vibrator formed of a shape memory resin with an outer diameter larger than the inner diameter of an existing pipe to a temperature above the shape recovery temperature and below the shape memory temperature. It is softened and flattened in an atmosphere, or bent to reduce its cross-sectional area, and while maintained in a softened state, it is inserted into a film tube made of a material whose thermal deformation temperature under load is higher than its shape memory temperature, and then wound or folded. It is characterized by being formed.

Furthermore, if reinforcing fibers are placed in the film tube, the reversal pressure can be increased, which is advantageous for long-distance construction.

[Function] In this invention, a resin pipe formed of shape memory resin with an outer diameter larger than the inner diameter of the existing pipe is softened, flattened, or bent in the radial direction, and the resin pipe with a reduced cross-sectional area is made heat resistant. This method uses a lining material formed by inserting it into a thin film tube that has Since the original shape is larger than the inner diameter of the existing pipe, when the shape is restored, it completely adheres to the inner surface of the existing pipe.

In addition, since the folded resin pipe is covered with a heat-resistant film tube, it can withstand the pressure of the pressurized fluid when it is turned over and moved through the existing pipe, preventing the deformation of the softened resin pipe. To prevent. In particular, if reinforcing fibers are placed in the film tube, the pressure of the pressurized fluid can be further increased.

[Example 1] Figure 1 is a process diagram showing the processing steps of an embodiment of the present invention. It consists of a copolymer (manufactured by Asahi Kasei Industries), transpolyisoprene (manufactured by Kuraray), or polyurethane resin (manufactured by Mitsubishi Heavy Industries). This resin pipe l is made by extruding shape memory resin into a pipe shape in a heated atmosphere at a shape memory temperature of, for example, 120°C or higher, and has a shape having an outer diameter of, for example, 100 to 150% of the inner diameter of the existing pipe. to remember.

Next, while softening the resin pipe l in a heated atmosphere at a shape recovery temperature (rubberization temperature) of, for example, 90°C or higher and lower than the shape memory temperature, the cross-sectional area is reduced by mechanical methods such as forming rollers or extrusion slits. Flatten it so that it is smaller than the cross-sectional area of the tube and bend it to make it as shown in Figures 1 (b) and (c).
Processing vibrators la, lb or processing vibe IC as shown in ) and (d) are formed. This processing vibrator la, lb
.

After forming the lc, the heat deformation temperature under load is higher than the shape memory temperature of the shape memory resin, for example, the heat deformation temperature under load is 160°C (4.6 Kgf/cm") while maintaining the softened state.
nylon or +35°C (4,6Kgf/cm”
As shown in Fig. 1(e), a processing vibrator la or processing vibrator lb or lc is inserted into a film tube 2 made of a film made of polyester, etc. () or a film containing reinforcing fibers to form a lining material. form 3. This lining material 3 may be wrapped circularly as shown in Fig. 1(f) or (
After the final formation into the folded state as shown in g), the lining material 3 is cooled below the shape recovery temperature and stored in a circularly rolled or folded state.

Next, the operation of forming a synthetic resin pipe on the inner surface of an existing pipe using the lining material 3 processed as described above will be explained with reference to the sectional view of FIG. 2.

First, the lining material 3 is rolled or folded into a circular shape in a pressurized/heated container 4 having a supply port 5, a heat insulating hose 6 attached to the supply port 5, and a fixing part 7 provided at the tip of the heat insulating hose 6. The processed lining material 3 is stored.

A heating boiler 8 is connected to this pressurizing/heating container 4, and pressurized water of a predetermined pressure is sent from the heating boiler 8 to cause the inside of the pressurizing/heating container 4 to be higher than the shape recovery temperature of the resin pipe l and lower than the shape memory temperature. The resin pipe 1 is kept in a softened state by maintaining the temperature at . At this time, the pressure of pressurized water is applied to the resin pipe l, which has reached the shape recovery temperature or higher, through the film tube 2, so that the resin pipe l maintains the folded shape of the processing vibrator la.

The tip of this softened lining material 3 is passed through the supply port 5 and the heat insulating hose 6, and then folded back so that the film tube 2 is on the inside and fixed to the fixing part 7. After that, lining material 3
The reversing part 9 of the is brought close to the pipe opening of the existing pipe 10, and the predetermined pressure is applied from the heating boiler 8.

Continuously supplies pressurized water at a predetermined temperature. Due to the pressure of this pressurized water, the inverted part 9 of the lining material 3 advances inside the existing pipe 10. When the lining material 3 inverts and advances inside the existing pipe 10, the processing vibe of the lining material 3, which has softened above its shape recovery temperature, is activated. la
The outer surface of the processing vibrator l is in contact with the inner surface of the existing pipe 10, and
The pressure of pressurized water acts on the inner surface of a through the film tube 2. Therefore, the processing vibrator la recovers its shape and returns to the shape of the resin pipe l. *The outer diameter of the fat pipe l is the inner diameter of the existing pipe 10! Since it is formed from 00 to 150%,
The interaction between the restoring force of the outer diameter and the pressure of the pressurized water causes the resin pipe 1 to adhere tightly to the inner surface of the existing pipe 10 without adhesive.

In this way, the entire inner surface of the existing pipe lO is covered with resin pipe lO.
After the resin pipes 10 are brought into close contact with each other, cooling water is supplied instead of pressurized water to cool the resin pipe 1, and then the film tube 2 is recovered to form a synthetic resin pipe within the existing pipe 10.

When forming this synthetic resin tube, film tube 2
has a high heat deformation temperature under load and has high heat-resistant tensile strength, so pressure acts directly on the processing vibrator la, which is softened by the pressure of pressurized water, causing the processing vibrator la to elongate abnormally, or to move ahead of the film tube. Prevents it from reversing.

Further, if the film tube 2 is reinforced with fibers, the action of the film tube 2 becomes more effective, and the pressure of pressurized water can be increased, so that workability in long-distance construction can be further improved.

In the above embodiment, a case was explained in which the resin pipe l was maintained at a temperature above the shape recovery temperature and below the shape memory temperature using heated water. It can play an action.

[Effects of the Invention] As explained above, the present invention reduces the cross-sectional area by softening, flattening, or bending radially a resin pipe made of shape memory resin and having an outer diameter larger than the inner diameter of the existing pipe. Using a lining material formed by inserting a resin pipe into a heat-resistant thin film tube, the resin pipe is turned over and advanced at the softening temperature within the existing pipe using pressurized fluid, and then the resin pipe is restored to its original shape. The original shape of this resin pipe is larger than the inner diameter of the existing pipe, so the interaction between the shape recovery force and the pressure of the pressurized fluid acts on the resin vibe, allowing the resin pipe to be assembled without using adhesives. Because it completely adheres to the inner surface of the existing pipe, it is possible to prevent gaps from forming between the pipe and the existing pipe due to contraction of adhesives and liquid resins when heated and hardened, eliminating the cause of water intrusion and leakage. can do.

In addition, after molding the resin pipe to an accurate pipe thickness, it is flattened and stored and transported in a solid state, eliminating variations in thickness and strength during storage. (temperature to shape memory temperature), the tube returns to its original thickness immediately after inversion, resulting in a uniform tube thickness and uniform strength, resulting in a significant improvement in quality.

In addition, since the rubber-like region at the time of inversion is also stretchable, the outer side expands and comes into close contact with the bent pipe portion, and the inner side contracts along the inner wall of the existing pipe, so wrinkles can be reduced.

In addition, since resin pipes can be closely attached to existing pipes without using adhesives or liquid resins, there is no need for hardening time for adhesives, etc., and the existing pipes require only simple surface treatment, reducing construction time. can be shortened.

Furthermore, since the film tube, which has a high thermal deformation temperature under load and has a heat-resistant tensile strength, can absorb the pressure of the pressurized fluid during reversal, it is possible to prevent abnormal elongation of the resin pipe that has softened during reversal. , it is possible to form a completely cylindrical synthetic resin pipe with little cross-sectional loss.

Further, by including reinforcing fibers in the film tube, the tensile strength of the film tube can be further increased, and workability in long-distance construction can be further improved.

Furthermore, since a device for adhering adhesive or the like is not required, the connecting part to the existing pipe can be small, and construction can be performed even from the manhole of a sewer pipe, thereby reducing construction costs.

In addition, since the softened lining material is reversed and advanced into the existing pipe using the pressure of pressurized water and then restored to its shape to form a synthetic resin pipe, it is easy to form a synthetic resin pipe that matches the shape of the bent pipe. I can do it.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing the processing steps of an embodiment of the present invention, and FIG. 2 is a sectional view showing the construction operation of the above embodiment. 1... Resin pipe, LA, LB... Processed vibe, 2... Film tube, 3... Lining material.

Claims (1)

[Claims] 1. A lining material for inversion lining, which is inverted within an existing pipe by pressurized fluid supplied from a pressure vessel and then lined inside the existing pipe, which is formed of a shape memory resin with an outer diameter larger than the inner diameter of the existing pipe. The resin pipe is softened in a heated atmosphere at a temperature higher than the shape recovery temperature and lower than the shape memory temperature to reduce its cross-sectional area by flattening or bending, and while maintaining the softened state, the material has a thermal deformation temperature under load higher than the shape memory temperature. A lining material for an inverted lining, characterized in that it is formed by inserting it into a film tube made of and then winding or folding it. 2. The inner lining material for inverted lining according to claim 1, wherein the film tube is molded with reinforcing fibers inserted therein.