JPH0392330A - Lining material for reversal lining and preparation thereof - Google Patents

Abstract

PURPOSE:To certainly apply lining to the inner surface of an existing pipe by filling a temp. pipe made flat with a sticking agent having temp. almost the same to shape recovery temp. as a softening point to apply lining to said pipe. CONSTITUTION:A resin pipe 1 molded from a shape memory resin is continuously inserted in a heating oven 2 set to a temp. range from shape recovery temp. to shape memory temp. to be sofentened. The degree of flatness of the resin pipe becoming a softened state is gradually enhanced to set the internal gap of the resin pipe to a definite size. A sticking agent 8 becoming a flowable state is supplied to the gap of the flattened resin pipe over the total length thereof from the tip of said pipe to be stored in the gap of the flattened resin pipe between a thickness control roller 6 becoming a softened rubber elastomer and a gap holding conveyor 5. Thereafter, the tip part of the flattened resin pipe is hermetically closed by a hermetical sealing jig 11 fitted with a traction rope 10 having length larger than the total length of the resin pipe. Then, the flattened resin pipe is successively drawn out between thickness control rollers 6 from the tip thereof while the flattened resin pipe is pressed to be taken up. By this method, the flattened resin pipe is uniformly filled with the sticking agent.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to sewerage systems. This article relates to bar lining materials used in the inverted lining method, which can be applied to water supply pipes, oil pipes, and all other existing pipes, and their manufacturing method. [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. The construction method disclosed in Japanese Patent Application Laid-open No. 64-185738 is to invert a lining material made of a 21 Dorfelt layer impregnated with a liquid thermosetting resin such as epoxy or polyester within an existing pipe using fluid pressure. In this method, the lining material is pressed against the inner surface of the existing pipe using fluid pressure, the thermosetting resin is hardened, and the inner surface of the existing pipe is lined with synthetic resin.

Also, Japanese Patent Application Laid-open No. 6.4-16633. Unexamined Japanese Patent Publication 1986-
The construction method disclosed in Publication No. 16634 or Japanese Patent Application Laid-Open No. 63-285395 involves inserting a thermoplastic pipe with a small diameter into an existing pipe circle, and then heating and pressurizing the thermoplastic pipe from the inside to expand it. This is a method of closely observing the inner surface of the tube. [Problems to be Solved by the Invention] The lining material used in the conventional inversion method as typified by Japanese Patent Publication No. 55-43890 is that the liquid thermosetting resin impregnated into the 21-Dolphelt layer is It moves within the felt layer due to the non-uniform pressing force in the circular direction of the inverted surface. 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 variations in thickness and strength. Additionally, when long lining materials are used, the flexible lining material impregnated with liquid resin must be rolled up or folded after the impregnation process in order to store it. For this reason, during storage, thickness variations occur in each part of the lining material due to differences in dead weight or pressing force, and environmental pressure differences are applied to the liquid resin. When synthetic resin pipes are formed using lining materials in this condition, variations in thickness and strength will occur. In addition, 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 resin tube. In addition, there was a misalignment of the joint of the technical pipe to the existing pipe. If there are gaps such as cracks or cracks, the liquid resin around these gaps will seep into the gap due to the pressing force of the existing pipe after turning over, reducing the strength around the gap, and the liquid resin will gel due to heating. Another drawback was that the previous viscosity drop caused it to flow out together with the water that had entered the ground, forming a porous impregnated layer that significantly reduced its strength.

In addition, the lining material impregnated with 5 thermosetting resin is heated and cured after being turned over and molded.
It takes about 15 hours when one polyester resin is used for the lining material of nm. In addition, even the quick-drying type of epoxy resin takes about 6 to 8 hours, so it has the disadvantage of increasing the working time. This is because heat is accumulated in the existing pipes and the surrounding soil during the long heating retention period, which slows down the cooling rate6. 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 creates a gap between the existing pipe and the lining layer, which has 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 power, so it must be forcibly elongated and expanded using external pressure. For this reason, it is necessary to uniformly heat both the circumferential and longitudinal parts of the existing pipe and the FM fat pipe 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 pipe that has been softened on the outside of the inner surface of a curved pipe is forcibly stretched and compressed using a small-diameter Vig, the outside part becomes thinner than other parts because there is no shrinkage in the softened state, and the inside part is stretched. The disadvantage was that it wrinkled on the downstream side in the direction of travel. The present invention was made to solve these shortcomings, and it is an object of the present invention to provide a lining material for inversion lining that can be reliably lined on the inner surface of an existing pipe, and a method for manufacturing the same. [Means for Solving the Problems] The lining material for inverted lining according to the present invention is obtained by softening and flattening a resin pipe made of shape memory resin in a heated atmosphere at a temperature higher than the shape recovery temperature and lower than the shape memory temperature.
Filling a flattened resin pipe with an adhesive having a softening point at a temperature similar to the shape recovery temperature of the resin pipe, and winding up the flattened resin pipe filled with the adhesive. Features: Further, in the method for manufacturing a lining material according to the present invention, the lining material is manufactured by the following manufacturing steps. ■． A resin pipe made of shape memory resin is continuously inserted into a heating furnace having a heating atmosphere above the shape recovery temperature and below the shape memory temperature to soften it. The softened resin pipe is sent to the increasingly narrow flat forming conveyor, and the flatness is gradually increased to adjust the internal void of the resin pipe to a certain size. While the adjusted gap of the flat resin pipe is held by a gap holding conveyor installed at the rear stage of the flat molding conveyor, the flat resin pipe is moved between the thickness adjustment rollers installed at a constant interval at the rear stage of the gap holding conveyor. Transport, ■. The adhesive, which has been heated to a fluid state and has a softening point at a temperature similar to the shape recovery temperature of the flat resin pipe, is supplied from the tip of the flat resin pipe by ffi to fill the entire length of the gap in the flat resin pipe, thereby increasing the thickness. Stored in the gap of the flat resin pipe between the adjustment roller and the gap holding conveyor, ■. After storing the adhesive, seal the tip of the flat resin pipe with a sealing jig with an index lobe that is longer than the entire length of the resin pipe, and ■. While the sealed flat resin pipe is sequentially wound around the drum around which the index lobe is wound, the adhesive is filled into the gap in the flat resin pipe. [Function] In this invention, a resin pipe formed of a shape memory resin is softened and flattened in a heated atmosphere at a temperature higher than the shape recovery temperature and lower than the shape memory temperature, and the shape recovery of the resin pipe is carried out inside the flattened resin pipe. A lining material is formed by filling an adhesive having a softening point at a temperature similar to the temperature.

This lining material is advanced into the existing pipe by turning the resin pipe in a softened state so that the adhesive is on the outside using a propelling heating fluid whose temperature is higher than the shape recovery temperature of the resin pipe and lower than the shape memory temperature. , while filling the corroded parts and cracks on the inner surface of the existing pipe with adhesive, the inner surface of the existing pipe and the resin pipe are brought into close contact via the adhesive. In addition, in this method for manufacturing lining materials, a resin pipe molded with shape memory resin is continuously inserted into a heating furnace having a heating atmosphere above the shape temperature and below the shape memory temperature to soften it. Gradually increase the flatness of the resin pipe to make the internal void of the resin pipe a certain size.
From the tip of this flat resin pipe, the adhesive, which has been heated to a fluid state and has a softening point at a temperature similar to the shape recovery temperature of the flat resin pipe, is supplied in an amount to fill the entire length of the gap in the flat resin pipe. Then, the softened rubber elastic material is stored in the gap of the flat resin pipe between the thickness adjustment roller and the gap holding conveyor, and then the tip of the flat resin pipe is sealed with a sealing jig with an index lobe that is longer than the entire length of the resin pipe. The adhesive is filled uniformly into the flat resin pipe by sealing it tightly and holding it between rollers to adjust the thickness and pulling out the flat resin pipe sequentially from the tip and winding it up. [Example] Figure 1. FIG. 2, FIG. 9, and FIG. 3 show the manufacturing process of a lining material according to an embodiment of the present invention. In the figure, l is a resin pipe, and the resin pipe l is a shape memory resin, such as a block copolymer of polystyrene and crystallized polybutadiene (manufactured by Asahi Kasei Industries), transpolyisobrene (manufactured by Kuraray), or polyurethane resin (manufactured by Mitsubishi Heavy Industries). Consists of etc. This resin pipe l is used to maintain the shape memory resin at a shape memory temperature of 1, for example.
The tube is extruded into a pipe shape in a heated atmosphere of 20° C. or higher, and a shape having an outer diameter of, for example, 100 to 120% of the inner diameter of the existing pipe is memorized. 2 is a heating furnace, and the atmospheric temperature within the heating furnace 2 is heated and maintained at a temperature that is above the shape recovery temperature of the m-fat pipe 1 and below the shape memory temperature. Reference numeral 3 denotes flat molding conveyors disposed vertically facing each other in the heating furnace 2, and the flat molding conveyor 3 is disposed such that the vertical width becomes narrower toward the tip. 4 is a fixed conveyor provided after the flat forming conveyor 3; 5 is a gap maintaining conveyor provided at a constant interval above the fixed conveyor 4; the total length of the gap maintaining conveyor 5 is L. is formed to be shorter than the total length L4 of the fixed conveyor 4 by a predetermined length. Reference numeral 6 denotes a thickness adjusting roller provided after the fixed conveyor 4, and the upper and lower rollers of the thickness adjusting roller 6 are arranged at the same interval as the interval between the fixed conveyor 4 and the gap maintaining conveyor 5. 7 is a heating/thermal insulating tank, which heats the adhesive 8 to a temperature higher than its melting point and stores it in a fluid state. This adhesive 8 has a melting point (softening point) of the resin vip 1 used.
A material having a temperature comparable to the shape f1i temperature (rubberization temperature) is used. For example, when the resin pipe l is made of shape memory resin with a shape recovery temperature of 90°C,
The adhesive 8 may be a bituminous adhesive, a synthetic rubber adhesive, or a bituminous and SBR rubber adhesive with a softening point of 90°C (for example,
Sankyo Yuka Kogyo: Undercoat M-40), hot-melt adhesives (heat-degradable elastomers) such as isobrene-based and ionomer polymers are selected depending on the type of existing pipe and degree of corrosion. Bituminous adhesives, synthetic rubber adhesives, and mixtures of these adhesives are cheaper than hot melt adhesives, and have better filling properties. Good airtightness. As a result, the inner surfaces of existing pipes, such as steel pipes and cast iron pipes, become pock-like due to severe corrosion, making it impossible to clean down to the bottom of the recess.
By using it on a surface treated with a grade 2 or less, or on the inner surface of concrete that has deteriorated and has large irregularities, it fills the uneven surface and exhibits adhesive strength.

In addition, hot melt adhesives have good adhesive properties, so SI
S Used on high-grade surface treated surfaces with Sa2・l/2 or higher. A method for manufacturing lining materials using the manufacturing apparatus configured as described above will be explained. First, the heating furnace 2 is heated and maintained at a temperature above the shape recovery temperature of the resin pipe 1 and below the shape memory temperature. The shape memory resin is placed in the heating furnace 2 at a shape memory temperature of 120°, for example.
A resin pipe 1 formed by extrusion molding into a pipe shape in a heated atmosphere of C or above is continuously inserted as shown in FIG. 1 to be in a softened state.

While conveying the softened resin pipe 1 on the flat molding conveyor 3, as the resin pipe 1 advances, the flat molding conveyor 3 presses the resin pipe 1 from above and below, as shown in FIG. ) As shown in (c), increase the flatness of the resin pipe l and adjust the internal gap of the resin pipe to a certain size, for example, 5mmNlromm.Next, use the fixed conveyor 4 and the gap holding conveyor 5 to adjust the internal gap to a certain size. The flat resin pipe l, which has become an internal void, is inserted into the tube, and while maintaining an internal void of a certain size, the flat resin is conveyed to the thickness adjustment roller 6 provided at a constant interval after the gap holding conveyor. When the tip 1a of the pipe 1 is sandwiched between the thickness adjusting rollers 6, the adhesive 8 is supplied from the tip 1a into the gap of the flat resin pipe 1 from the heating/insulating tank 7 via the heat insulating hose 9. The amount of adhesive 8 supplied is such that the entire length of the gap in the flat resin pipe 1 can be filled at once.The adhesive 8 supplied from the tip 1a is applied to the thickness adjusting roller 6
and the gap-holding conveyor 5. This flat resin pipe section 1b is maintained at a temperature above the shape recovery temperature and below the shape memory temperature and is made of rubber elastic material, so unlike ordinary thermoplastic synthetic resin pipes, it can expand greatly without bursting. is possible,
All the sent adhesive 8 can be stored. After storing the adhesive 8 in the flat resin pipe part lb, as shown in FIG. As shown in FIG. 3, a sealing jig 1l is attached to the tip, and a drum l2 wrapped with an index row 110 that is longer than the entire length of the resin pipe l is inserted into the heating furnace 2. Then, as shown in FIG. 3, the tip 1a of the flat resin pipe 1 is sealed with a sealing jig it. Thereafter, the flat resin pipe l whose tip portion 1a is sealed is sequentially wound around the drum l2 around which the indexing lobe IO is wound. When winding up this flat resin pipe l, the expanded flat resin pipe portion 1b is sequentially pressed by the thickness adjusting roller 6, and as shown in the cross-sectional view of FIG.
1 is filled with adhesive 8 to a constant thickness to form a lining material 13. When winding up the flat resin pipe l to form the lining material l3, the flat resin pipe l filled with the adhesive 8 is held down by the molding slit l4 to prevent the flat resin pipe l from expanding and expanding. be able to. Next, a case will be explained in which a synthetic resin pipe is formed inside an existing pipe using the lining material l3 formed as described above. First, as shown in FIG. 6, the lining material l3 wound around the drum l2 together with the indexing lobe 10 is stored in the heating insulation W115. This heating and insulation 1i115 is installed adjacent to the inverted pressure vessel 17 placed close to the existing pipe 16,
Fix the lining material supply port l8 of the heating and insulation 4915 to the lining material insertion port l9 of the inverted pressure vessel l7. In this state, 2 liters of heating fluid such as hot air or steam is supplied from the heating fluid supply port 20 of the heating and heat-insulating tank 15, and while being discharged from the upper venturator 22, the inside of the heating and heat-insulating tank 15 is filled with the resin pipe that constitutes the lining material 13. The pressure-sensitive adhesive 8 of the lining material l3 is kept in a temperature range from the shape recovery temperature of l to the shape memory temperature, and the adhesive 8 of the lining l3 is brought into a fluid state, and the flat resin pipe l is brought into a softened state.

Next, the tip of the lining material l3 is pulled out from the heating heat-insulating tank l5 into the inverted pressure vessel 17, and the tip is inverted so that the adhesive 8 of the lining material l3 is on the outside, and the tip is inserted into the lining material outlet 23 of the inverted pressure vessel 17. Secure with band 24. Lining material l
After the tip of the resin pipe 1 is inverted and fixed, a propulsion heating fluid 26 having a temperature ranging from the shape recovery temperature to the shape memory temperature of the resin pipe 1 is continuously supplied from the heating fluid supply port 25 of the inversion pressure vessel 17. By supplying the propelling heating fluid 26, the inverted portion 27 of the lining material 13 is inserted into the existing pipe 16, and moves through the existing pipe 16 due to the pressure difference between the inside and outside of the inverted portion. When this reversal section 27 moves inside the existing pipe 16, the lining material 13 before reversal is
Its shape recovery pressure is lower than that of metallic shape memory materials,
Also, since it is pressed from both sides by the pressure of the propelling heating fluid 26, it expands. Proceed without expansion. Also,
The inverted portion 2a of the lining material 13 is made of a rubber elastic body,
Further, after being turned over, the resin pipe 1 exerts its shape recovery force, so that it can be easily turned over and expanded, and there is no need to forcibly expand and expand it, unlike conventional lining materials. Therefore, the pressure of the propulsion heating fluid 26 is such that the reversing section 27 advances, for example, when the existing pipe l6 is a pipe with a diameter of 250 to 30 hm, the pressure is 0.
．． An extremely low pressure of about 2 Kgf/am'' is sufficient.

In addition, since the pressure of the propulsion heating fluid 26 is low, 5
Deformation due to elongation of the lining material l3 can be prevented. The straightening plate 28 of the inverted pressure vessel 17 prevents the lining material 13 before and after inversion from coming into contact with each other and causing frictional resistance when the inverted portion 27 of the lining material 13 moves inside the existing pipe 16. In this way, when the lining material 13 is inverted onto the inner surface of the existing pipe 16, the adhesive 8 of the lining material 13 removes air and water from the inner surface of the existing pipe 16, for example, as shown in FIGS. 7 to 10. As shown, a recess 29 and a dislocated joint 30 are formed on the inner surface of the existing pipe 16 due to severe corrosion. Crack part 3l
Alternatively, it enters and fills the gap 32, etc., and adhesively joins the inner surface of the existing pipe 16 and the resin pipe 1.

When the reversal section 27 advances to the middle of the existing pipe 16, the lining r
) The end portion of the material 13 sealed with the sealing jig 11 is pulled out into the inverted pressure vessel l7, and thereafter the inverted portion 27 is connected to the indexing lobe lO.
It is supported by the tension of. After the reversing section 27 advances to the terminal end of the existing pipe 16, the resin pipe 1 is cooled naturally to below the shape recovery temperature of the resin pipe 1, or forcedly cooled by supplying a cooling fluid such as cold air or cold water. After recovering and curing the shape and curing the adhesive 8, the existing pipe 1
Cut both ends of the synthetic resin pipe formed in 6 and connect it to the existing pipe 1.
Complete a free-standing synthetic resin pipe inside 6. [Effects of the Invention] As explained above, the present invention is characterized in that a resin pipe formed of a shape memory resin is softened and flattened in a heated atmosphere at a temperature higher than the shape recovery temperature and lower than the shape memory temperature. is filled with a viscosity agent having a softening point at a temperature similar to the shape recovery temperature of the resin pipe to form a lining material,
This lining material is advanced into the existing pipe by turning the resin pipe in a softened state so that the adhesive is on the outside using a propelling heating fluid whose temperature is higher than the shape recovery temperature of the resin pipe and lower than the shape memory temperature. , since it is possible to make the inner surface of the existing pipe and the resin pipe into close contact with each other through the adhesive while filling the corroded parts and cracks on the inner surface of the existing pipe, there is no gas or liquid between the inner surface of the existing pipe and the resin pipe. This can prevent water from entering and water leakage.

In addition, after molding the resin pipe to an accurate pipe thickness, it undergoes flattening processing and is stored and transported in a solid state, eliminating variations in thickness and strength during storage. temperature to shape memory temperature), so the reversal pressure is small, preventing deformation of the lining material during reversing, and it returns to its original thickness immediately after reversing, making it possible to create a synthetic resin with a uniform thickness. The pipe can be formed on the inner surface of an existing pipe, making the strength of the synthetic resin pipe uniform and stabilizing the flow characteristics. In addition, since the rubber-like region is elastic when inverted, the outer side stretches and adheres to the curved pipe, and the inner side contracts along the inner wall of the existing pipe, reducing wrinkles. Furthermore, since resin pipes can be closely attached to existing pipes without using adhesives or liquid FIII fat, there is no need for hardening time for adhesives, etc., and existing pipes require simple surface treatment, making construction easier. It can save time.

In addition, in this method for manufacturing the lining material, a resin pipe molded with shape memory resin is continuously inserted into a heating furnace having a heating atmosphere above the shape recovery temperature and below the shape memory temperature to soften it. Gradually increase the flatness of the resin pipe to make the internal void of the resin pipe a certain size.
Types of existing pipes within this fixed size gap. Since the adhesive is filled uniformly depending on the degree of corrosion, etc., it is possible to easily form the optimal lining material for each existing pipe.

[Brief explanation of drawings]

Figure 1. Figure 2. FIG. 3 shows the manufacturing process of the lining material according to the embodiment of the present invention, and FIG. 1 and FIG. 2 are sectional views, respectively.
Fig. 3 is a perspective view, Fig. 4 is a sectional view showing changes in the flatness of the resin pipe in the above embodiment, Fig. 5 is a sectional view showing the lining material in the above embodiment, and Fig. 6 is a reversal due to the above lining material. Cross-sectional views showing the construction operation of the lining method, Figures 7 to 1
FIG. 0 is an explanatory diagram showing the operation of each of the above embodiments.

Claims (1)

[Claims] 1. In a lining material for inversion lining, which is inverted within an existing pipe and lined inside the existing pipe by pressurized fluid supplied from a pressure vessel, the resin pipe formed of shape memory resin is heated to a temperature higher than the shape recovery temperature. The resin pipe is softened and flattened in a heated atmosphere below its shape memory temperature, and the flattened resin pipe is filled with an adhesive having a softening point at a temperature similar to the shape recovery temperature of the resin pipe, and then rolled up. A lining material for inverted linings. 2. A resin pipe molded with shape memory resin is continuously inserted into a heating furnace having a heating atmosphere above the shape recovery temperature and below the shape memory temperature to soften it. The softened resin pipe is sent to a flat molding conveyor that becomes narrower, and the flatness is gradually increased to adjust the internal gap of the resin pipe to a constant width, and the adjusted gap of the flat resin pipe is transferred to the latter stage of the flat molding conveyor. The flat resin pipe is conveyed to between thickness adjustment rollers provided at a certain interval after the gap holding conveyor while being held by a gap holding conveyor, and the flat resin pipe is heated to a temperature similar to the shape recovery temperature of the flat resin pipe. The adhesive, which has been heated to a fluidized state and has a softening point of After storing the adhesive in the gap in the pipe, the tip of the flat resin pipe is sealed with a sealing jig with an index lobe that is longer than the entire length of the resin pipe, and the sealed flat resin pipe is placed on a drum around which the index lobe is wrapped. A method for producing a lining material, which comprises filling the voids of a flat resin pipe with an adhesive while sequentially winding the pipe.