JPH0347733A - Lining material for reverse lining - Google Patents

Abstract

PURPOSE:To make it possible to surely line the inner surface of existing tube by a method wherein resin pipe is softened in 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 or folded after flattening so as to make its cross-section smaller and, after that, inserted in film tube made of material, the thermal deformation temperature under load of which is higher than the shape memory temperature of the resin and finally reeled up or folded up for producing the lining material concerned. CONSTITUTION:Resin pipe 1 is memorized so as to have the shape, the outer diameter of which is 1.0 - 1.5 times as large as the inner diameter of existing tube, by extruding shape memory resin in the heating atmosphere, the temperature of which is higher than the shape memory temperature of the resin. The resin pipe, in which heat-resistant introductory hose 2 is inserted, 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 folded so as to form a worked pipe 1a, 1b or 1c. Immediately after being formed and under softened state, the worked pipe is inserted in film tube 3, the thermal deformation temperature under load of which is higher than the shape memory temperature of the shape memory resin, so as to produce lining material 4. The resultant lining material 4 is wound spirally or folded up as the final shape and cooled below the shape restoring temperature and stored.

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. Crimp the inner surface of the pipe, harden the thermosetting resin, and synthesize it on the inner surface of the existing pipe! This is a method of lining with 1 fat.

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.

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.

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.

In addition, the joints of branch pipes to existing pipes are misaligned or lost.

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 heated and cured after being turned over and molded, and the total time of heating time and cooling time during heat curing is, for example, 300 mm in diameter and 6 m in thickness.
Approximately 15 m 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.

Further, when the thermosetting resin is heated and cured, contraction 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 the parts evenly under the same pressure. but,
In reality, the disadvantages are that the heating temperature varies, wrinkles occur in the resin tube, unevenness occurs in the tube thickness, 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 that has softened on the outside of the inner surface of a curved pipe is forcibly stretched and crimped with a big wire, the outside part becomes thinner than other parts because there is no shrinkage in the softened state, and the stretched part on the inside becomes thinner than other parts. It has the disadvantage that it wrinkles on the downstream side in the direction of travel.

This invention was made to solve these disadvantages, and the object is to obtain a lining material for inversion lining that can be reliably lined on the inner surface of existing pipes without using adhesives or liquid resins. It is something.

[Means for Solving Problem S] The lining material according to the present invention has an outer diameter larger than the inner diameter of the existing pipe and is made of a shape memory resin.
A heat-resistant introduction hose that introduces steam is inserted from the tip of the resin pipe and has many small holes extending at least as long as the length of the resin pipe. It is softened in a heated atmosphere to make it flat, or it is flattened and then bent to reduce its cross-sectional area, and while it is kept 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. It is characterized by being formed by rolling it up or folding it.

Furthermore, by embedding a heating element in the heat-resistant introduction hose, the temperature inside the existing pipe can be increased during construction.

[Function] In this invention, a heat-resistant introduction hose having a large number of small holes and introducing steam is inserted into a resin pipe made of shape memory resin and having an outer diameter larger than the inner diameter of the existing pipe, and The tip of the heat-resistant introduction hose extends from the tip of the resin pipe by at least the same length as the resin pipe, and the resin pipe is softened and deformed in the radial direction to reduce its cross-sectional area. The pipe is inserted into a heat-resistant thin film tube to form the lining material.

This lining material is reversed and advanced within the existing pipe using heated and pressurized fluid at the softening temperature of the resin pipe, thereby restoring the resin pipe to its original shape. At this time, by blowing high-temperature steam into the existing pipe from the heat-resistant introduction hose, the temperature of the existing pipe on the surface of the inverted resin pipe section is increased, and the temperature distribution of the resin pipe in the inverted section is made uniform.

A heating element may be embedded in this heat-resistant introduction hose to increase the temperature inside the existing pipe.

In addition, since the resin pipe with a reduced area is covered with a film tube that has heat-resistant tensile strength, when the lining material is reversed and advanced within the existing pipe, it prevents the resin pipe from being deformed due to the pressure of the heated and pressurized fluid. .

[Example] Fig. 1 is a process diagram showing the processing steps of an embodiment of the present invention. In Fig. 0, l is a resin pipe, and the resin pipe l is a block of shape memory resin, for example, polystyrene and crystallized polybutadiene. 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 memorizes a shape having an outer diameter of 100 to 150% of the inner diameter of the existing pipe. let

Reference numeral 2 denotes a heat-resistant introduction hose having a large number of small holes.The heat-resistant introduction hose 2 is made of, for example, a hose made of nylon fiber coated with fluororesin, and is inserted into the resin pipe 1, and its tip extends at least from the tip of the resin pipe 1. It extends by the same length as the resin pipe l.

The resin pipe l into which this heat-resistant introduction hose 2 has been inserted is softened in a heated atmosphere at a shape recovery temperature (rubberization temperature) of, for example, 906 C or above and below the shape memory temperature, and then cut by a mechanical method such as a forming roller or an extrusion slit. It is flattened so that its area is smaller than the cross-sectional area of the existing pipe, and then bent to form processing vibrators la, lb or lc as shown in FIGS. 1(b), (c), and (d).

After forming the processing vibrators la, lb, and 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° while maintaining the softened state.
C (4,6Kgf/cm”) nylon or 13
A film tube 3 made of a polyester film at 5°C (4.6K g f/cm") or a film containing reinforcing #a fibers is processed as shown in Fig. 1(e). A vibrator la or a processing vibrator lb or lc is inserted to form a lining material 4. This lining material 4 is
After final shaping into a circularly wound state as shown in FIG. 5(f) or a folded state as shown in FIG.

Next, the operation of forming a synthetic resin pipe on the inner surface of an existing pipe using the lining material 4 processed as described above will be described with reference to the sectional view of FIG. 2.

First, the lining material 4 is rolled or folded into a circular shape in a pressurized/heated container 5 having a supply port 6, a heat insulating hose 7 attached to the supply port 6, and a fixing part 8 provided at the tip of the heat insulating hose 7. The processed lining material 4 is stored.

A heating boiler 9 is connected to this pressurizing/heating container 5, and pressurized water of a predetermined pressure sent from the heating boiler 9 causes the inside of the pressurizing/heating container 5 to be heated to a temperature above the shape recovery temperature of the resin vibrator l and below the shape memory temperature. The resin vibrator l is kept at a temperature of retains its shape.

In this state, the tip of the heat-resistant introduction hose 2 is inserted through the heat insulating hose 7 from the pipe opening 10a of the existing pipe 10, and the sealing member l having the discharge valve 11 attached to the terminal fob of the existing pipe 10 is inserted.
? to draw from.

Next, the resin vibrator l softened in the pressurized/heated container 5
The tip is pulled out through the heat insulating hose 7, folded back so that the film tube 3 is on the inside, and fixed to the fixing part 8. Thereafter, the folded inverted portion 13 is immediately transferred to the existing pipe 1.
Pressurized water at a predetermined pressure and a predetermined temperature is continuously supplied from a heating boiler 9 near the pipe port 10a of the pipe. Due to the pressure of this pressurized water, the reversing section 13 enters the existing pipe 10 and advances within the existing pipe 10. At the same time as the reversing section 13 advances, the tip of the heat-resistant introduction hose 2 is wound up, and steam having a temperature higher than the shape recovery temperature of the resin vibrator I is supplied from the tip of the heat-resistant introduction hose 2. This steam is released into the existing pipe 10 from a large number of small holes provided in the heat-resistant introduction hose 2, and the discharge valve 1
1, the front of the inverted portion 13 of the existing pipe 10 can be maintained at a temperature higher than the shape recovery temperature. In addition, at the rear of the reversing part 13, the pressure-resistant introduction hose 2 is pressed by the pressure of pressurized water sent from the pressurized/heated container 5 and is in a collapsed state, so that no steam is released.

The resin vibrator 1 and the reversed portion of the film tube 3 are in contact with each other, and the pressure of pressurized water acts on the inner surface of the resin vibrator 1 via the film tube 3. At this time, since the temperature in front of the reversing section 13 is also above the shape recovery temperature due to the steam released from the pressure-resistant introduction hose 2, the inner and outer surfaces of the resin vibrator in the reversing section 13 are almost the same regardless of the ambient temperature of the existing pipe 10. temperature, and recovers from the inversion part 13 to its original shape.

The original shape of this resin vibrator is such that the outer diameter is 00% to 150% of the inner diameter of the existing pipe, so the interaction between the recovery force to restore this outer diameter and the pressure of the pressurized water works to make the resin vibrator 1 is closely attached to the inner surface of the existing pipe 10 without adhesive.

Even if the reversing portion 13 advances further and reaches the bending portion 10c of the existing pipe 10 as shown in FIG.
Since it advances along the heat-resistant introduction hose 2 that was inserted first, it can also advance through the bent portion 10c without difficulty.

In this way, the entire inner surface of the existing pipe 10 is covered with resin vibrator l.
After the heat-resistant introduction hose 2 is brought into close contact, the resin vibrator l is cooled by supplying cooling water instead of pressurized water, and then the film tube 3 is collected to form a synthetic resin pipe inside the existing pipe 10. .

When forming this synthetic resin tube, film tube 3
Since it has a high heat deformation temperature under load and has high heat-resistant tensile strength, it receives the pressure of pressurized water and applies direct pressure to the softened resin vibrator l, causing the resin vibrator l to elongate abnormally or to move ahead of the film tube. Prevents it from reversing.

Further, if the film tube 3 is reinforced with reinforcing fibers, the action of the film tube 3 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 has been described in which steam is introduced into the heat-resistant introduction hose 2 to raise the inside of the existing pipe in front of the reversing section 13 to a uniform temperature. , existing pipes by electric heating
The internal temperature of O may be increased.

[Effects of the Invention] As explained above, the present invention provides a heat-resistant introduction hose that has many small holes and introduces steam to a resin pipe that has an outer diameter larger than the inner diameter of the existing pipe and is made of shape memory resin. The resin pipe is inserted into the interior, and the tip of the heat-resistant introduction hose is extended from the tip of the resin pipe by at least the same length as the length of the resin pipe, and the resin pipe is softened and deformed in the radial direction to reduce its cross-sectional area. A resin pipe with a reduced cross-sectional area is inserted into a heat-resistant thin film tube to form the lining material.

This lining material is reversed and advanced within the existing pipe using heated and pressurized fluid at the softening temperature of the resin pipe, thereby restoring the resin pipe to its original shape. At this time, by blowing high-temperature steam into the existing pipe from a heat-resistant introduction hose or by applying electrical heating, the temperature of the existing pipe on the surface of the resin pipe reversal section is increased and the temperature distribution of the resin pipe on the reversal section is made uniform. The resin pipe can be brought into close contact with the inner surface of the existing pipe from the inverted part.

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 the reversing section advances along the heat-resistant introduction hose, it can be smoothly advanced through existing pipes that have bends.

Furthermore, since the film tube has a high heat deformation temperature under load and is heat-resistant and anti-hearing, it can absorb the pressure of the pressurized fluid when it is turned over, so it is possible to prevent abnormal elongation of the resin pipe when it is turned over. A good synthetic resin pipe can be formed on the inner surface of an existing pipe.

[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 execution operation of the above embodiment. l...resin pipe, la, lb, lc...processed vibrator, 2...heat resistant introduction hose, 3...film tube, 4...lining material. Figure 1 ■: Tree 1'l spit≦ノ＼'iaaaa

Claims (1)

[Claims] 1. A lining material for inverted lining, which is inverted within an existing pipe and lined on the inner surface of the existing pipe, the inside of a resin pipe having an outer diameter larger than the inner diameter of the existing pipe and made of shape memory resin. A heat-resistant introduction hose for introducing steam, which has many small holes extending at least the same length as the length of the resin pipe, is inserted from the tip of the resin pipe, and the resin pipe is heated to a temperature above the shape recovery temperature and below the shape memory temperature. It is softened and flattened in a heated atmosphere, or it is flattened and bent to reduce its cross-sectional area, and while it is kept 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. A lining material for an inverted lining, characterized in that it is formed by rolling or folding the lining. 2. The lining material for inversion lining according to claim 1, wherein the heat-resistant introduction hose is formed by embedding a heating element.