JPH0688336B2 - Lining material and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an inner lining material used for inner surface lining of sewers, waterworks, oil pipes and other existing pipes, and a method for manufacturing the same.

[Prior art] In recent years, for the purpose of reinforcing the strength of existing pipes such as sewers and waterworks, anticorrosion measures, water leakage and water infiltration measures, and improving the flow rate, synthetic resin is lined on the inner surface of the existing pipe or synthetic resin is applied on the inner surface of the existing pipe. The reverse lining method of forming a tube is in the spotlight.

For example, the method disclosed in JP-B-55-43890 and JP-A-64-85738 discloses a method in which a needle felt layer is coated with epoxy,
Inside the existing pipe, the lining material impregnated with liquid thermosetting resin such as polyester is reversed and advanced by fluid pressure inside the existing pipe, and the reversed lining material is pressed against the inside surface of the existing pipe by fluid pressure to cure the thermosetting resin. This is a method of forming a synthetic resin pipe on the surface.

A conventional thermosetting resin-impregnated lining material represented by JP-B-55-43890 is inverted and then heat-cured to form a synthetic resin pipe, but the total heating time and cooling time during heat-curing For example, when polyester resin is used as thermosetting resin for the lining material with a diameter of 300 mm and a thickness of 6 mm,
It takes 15 hours. Further, even if the quick-drying type of the epoxy resin is used, it takes about 6 to 8 hours, and the working time is long. This is also due to the fact that heat is stored in the existing pipe and surrounding soil during the long heating and holding period, and the cooling rate becomes slow.

In order to eliminate such drawbacks, a lining material consisting of a felt layer impregnated with a resin that is cured by irradiating ultraviolet rays to a fibrous material is used, and a synthetic resin is applied to the inner surface of the existing pipe in a short working time. A method of lining the above is disclosed in, for example, JP-A-60-242038, JP-A-61-117343 or JP-A-62-132631.

[Problems to be Solved by the Invention] Since the conventional lining material disclosed in the above-mentioned JP-A-60-242038 is formed only by the felt layer impregnated with a resin which is cured by irradiation of ultraviolet rays, the lining material Material tension
The compressive strength and elastic modulus are small, and there is a disadvantage that when the resin is inverted, the lining material is deformed to cause a difference in the amount of resin impregnated in the cross-sectional direction of the lining material, resulting in a variation in thickness and a variation in strength.

Further, particularly when a long lining material is used, it is necessary to wind or fold it after the impregnation process in order to store the soft lining material impregnated with the cured resin. At this time, the thickness of each part of the lining material varies due to the difference in its own weight or the pressing force. When the synthetic resin pipe is formed by the lining material in such a state, the thickness and the strength also vary.

In addition, when the existing pipe has gaps such as slippage, disengagement, and cracks of the joint part of the technique pipe, the cured resin around these gaps oozes into the gap due to the pressing force of the existing pipe after reversing, and In addition to the decrease in strength, the cured resin also flows out together with the underground infiltration water, forming a porous impregnated layer, resulting in a significant decrease in strength.

Also, if groundwater enters the felt layer of the lining material,
There is also a disadvantage in that the ultraviolet rays are absorbed by oxygen in the groundwater to lower the radical reaction of the cured resin and reduce the efficiency of the ultraviolet curing action.

The present invention has been made to solve the above drawbacks, and an object thereof is to improve the physical properties such as tensile / compressive strength and elastic modulus, and to propose a lining material that is not affected by groundwater and a manufacturing method thereof. It is what

[Means for Solving the Problems] The lining material according to the present invention comprises an outer layer film tube, a felt layer provided on the inner surface of the outer layer film tube,
The inner layer film tube is provided on the inner surface of the felt layer.

The outer film tube is made of a synthetic resin having a solvent resistance and a white color tone. The felt layer is made of acrylic fiber, and glass fibers are dispersed on both the inner and outer surfaces, or on one or both sides, and punched into a united body, and impregnated with a UV-curable unsaturated polyester resin containing a photoinitiator that absorbs near UV rays. Is formed. The inner film tube is made of a synthetic resin that has a high light transmittance, a low water vapor and gas permeability, and a high heat distortion temperature under load.

Further, the manufacturing method of this lining material, the outer layer film sheet made of synthetic resin having solvent resistance and white tone, adhered to one side of the outer layer film sheet, made of acrylic fiber, both upper and lower surfaces of both sides or one side or A glass fiber dispersed in the intermediate layer is punched to be integrated, and a felt layer impregnated with a UV-curable unsaturated polyester resin containing a near-UV absorbing photoinitiator is adhered to the other side of the felt layer. 90% to 98% of the inner diameter of the existing pipe made of a synthetic resin inner layer film sheet with good light transmission, low water vapor / gas transmission, and high heat distortion temperature under load
The peripheral length of the sheet is cut with a certain amount of overlap margin, and the cut multilayer sheet is sewn by overlapping both widthwise ends with the inner layer film sheet inside, and each cross section of the overlapping section and the multilayer sheet. Is laminated with a film sheet of the same material as the outer layer film sheet.

[Operation] The lining material of the present invention is obtained by forming the felt layer by integrating glass fiber with acrylic resin by punching,
Increases mechanical properties such as tensile and compressive strength and elastic modulus of the felt layer.

Also, by providing an outer layer film tube made of solvent-resistant synthetic resin on the outer surface of the felt layer that is on the existing pipe side, it is possible to prevent groundwater from entering the felt layer when the lining material is pressed against the inner surface of the existing pipe. In addition, the resin of the felt layer is prevented from seeping out. By forming this outer layer film tube in a white color tone, the reflection efficiency of ultraviolet rays that are irradiated from the inside to cure the felt layer is increased.

Further, by providing a light-transmissive inner layer film tube on the inner surface of the felt layer, the felt layer is irradiated without the ultraviolet rays being absorbed. Furthermore, since this inner layer film tube is made of synthetic resin with low water vapor and gas permeability and high heat deformation temperature under load, when it is expanded from the inside by fluid pressure such as water pressure, it can withstand the fluid pressure sufficiently. At the same time, it prevents the fluid such as water vapor from entering the felt layer.

In addition, this inner lining material can be formed into a lining material corresponding to the inner diameter of the existing pipe by simply processing a multilayer sheet including an outer layer film sheet, a felt layer and an inner layer film sheet.

[Embodiment] FIG. 1 is a perspective view showing an embodiment of the present invention. In the figure, 1 is an inner lining material, 2 is an outer layer film tube of the inner lining material 1, and the outer layer film tube 2 is formed of a synthetic resin film such as nylon, vinylon or the like having excellent solvent resistance and white tone. 3 is a felt layer laminated on the inner surface of the outer layer film tube 2, and the felt layer 3 is a layer that determines the thickness of the synthetic resin tube after molding. As shown in the sectional view of FIG. For example, with a thickness t = 6 mm, a felt 3a is formed by punching so as to have a thickness of 500 g to 1800 g / m ^2, and a glass fiber having a length of, for example, 30 mm or more on both the inner and outer surfaces of the felt 3a 20% by weight or more of 3b is dispersed and integrated by punching, and the felt 3a is impregnated with a UV-curable unsaturated polyester resin containing a photoinitiator that absorbs a long-wavelength spectrum of 350 to 450 nm where the penetration depth of near UV is large. I am doing it.
The ultraviolet curable unsaturated polyester resin impregnated in the felt 3a is made of, for example, a neopentyl glycol acrylate resin or an epoxy acrylate resin, and the photoinitiator is, for example, an acylphosphine oxide and a solvent, or an acylphosphine oxide and a light in the thickness direction. It is composed of a peroxide catalyst and a solvent which assist heat curing by the generated heat, and this resin preferably has a viscosity of 1 to 40 poise at a temperature of 20 ° C. from the viewpoint of impregnating property to the felt 3a and thickness retention.

4 is, for example, 200 laminated on the inner surface of the felt layer 3.
An inner layer film tube having a thickness of μm or more,
The inner layer film tube 4 is a film tube 5 made of a synthetic resin having a high light transmittance and a low water vapor permeability, and a film tube 5 having a high light transmittance and a low gas permeability such as carbon dioxide gas and a high heat distortion temperature under load, for example, a nylon film. And the film tube 6 formed of the same. The film tube 5 of the inner layer film tube 4 is combined with the inner film tube 6 by a co-extrusion method, and acts as an adhesive layer that is easy to laminate with the felt layer 3, for example, an ionomer having good transparency, elongation and adhesiveness. Resin or the like is used.

Next, a method for manufacturing the lining material 1 configured as described above will be described.

First, as shown in the perspective view of FIG. 3, an outer layer film sheet 2a forming the outer layer film tube 2, a felt layer 3 and film sheets 5a, 6a forming the film tubes 5,6.
The multilayer sheet 7 made of the inner layer film sheet 4a is cut so that the width W becomes a width obtained by adding about 50 mm to the peripheral length of 90 to 98% of the inner diameter of the existing pipe lined on the inner surface.

Next, the cut multilayer sheet 7 is sewn with the inner layer film sheet 4 inside as shown in FIG. The sewn portion and the cross-sectional portion of the multilayer sheet 7 are laminated with a partial laminate sheet 8 made of the same synthetic resin as the outer layer film sheet 2a, and the felt layer 3 is sealed to form the lining material 1 shown in FIG.

The lining material 1 formed in this manner is directly inserted into the existing pipe to form a synthetic resin pipe without using the reverse lining technique. On the other hand, since the inner lining material 1a used for the inversion lining method needs to invert the inner and outer surfaces of the inner lining material 1, one end of the inner lining material 1 formed as described above is sealed,
The inner layer film sheet 4 is turned upside down by a pressure medium such as air so that the inner layer sheet 4 shown in FIG.
You can get 1a.

Since the lining materials 1, 1a thus formed are cured by irradiation with light, they are stored and transported in a sealed container made of an opaque material in a circularly wound or folded state.

Next, the lining material 1 configured as described above is inserted into the existing pipe as it is, or the lining material 1a for the reverse lining is inverted and advanced into the existing pipe by fluid pressure and then inserted.
Fluid pressure such as water pressure is applied from the inside of the lining material 1 inserted in this existing pipe or the inverted lining material 1a to the lining material 1,
Inflate 1a and crimp it to the inner surface of the existing pipe. When this fluid pressure is applied and the inner lining material 1 is pressure-bonded to the inner surface of the existing pipe, the film tube 6 of the inner layer film tube 4 is formed of a strong nylon film or the like, and the outer layer film tube 5 is also present in the outer layer. Therefore, the felt layer 3 can be pressure-bonded to the inner surface of the existing pipe with a uniform thickness. Further, since the inner and outer surfaces of the felt layer 3 cover the inner layer film tube 4 and the outer layer film tube 2 that are impermeable to steam and water, water for applying ground water or fluid pressure when crimping to the inner surface of the existing pipe, It prevents vapor and the like from entering the felt layer 3 and prevents the resin of the felt layer 3 from leaching to the outside. Further, even if the synthetic resin pipe is formed in the existing pipe and used for a long period of time, the contents under pressure do not permeate the inner film tube 4 and diffuse into the felt layer 3 to deteriorate the felt layer 3.

Although the lining material 1 is not crimped to the inner surface of the existing pipe in this way,
An ultraviolet ray generating lamp such as a metal halide lamp is inserted along the inner layer film tube 4 of the lining material 1 to irradiate the lining material 1 with ultraviolet rays. The irradiated ultraviolet rays are hardly absorbed when passing through the inner layer film tube 4 having a good light transmittance and enter the felt layer 3. Also,
Ultraviolet rays that have entered the felt layer 3 and have reached the outer layer film tube 2 have a white tone.
Is reflected by and returns to the felt layer 3. This ultraviolet ray is absorbed by the photoinitiator impregnated in the felt layer 3 to cause a radical polymerization reaction to generate heat, and this heat further activates the peroxide catalyst molecule, whereby the ultraviolet curable unsaturated polyester resin Curing is promoted, and the felt layer 3 is cured in a short time of about 3 minutes to form a synthetic resin pipe in the existing pipe. When the felt layer 3 is hardened, groundwater or the like does not enter the felt layer 3, so that ultraviolet rays are not absorbed by oxygen in the groundwater or the like, thereby preventing a decrease in the ultraviolet ray hardening action caused by oxygen. .

EFFECTS OF THE INVENTION As described above, according to the present invention, the felt layer of the lining material impregnated with the UV-curable unsaturated polyester resin containing the photoinitiator that absorbs near-ultraviolet rays is made of acrylic resin having a high light-transmissivity and made of glass. By integrally forming the fibers by punching, mechanical characteristic values such as tensile / compressive strength and elastic modulus of the felt layer can be increased.

Further, since the felt layer is sandwiched between the inner layer film tube and the outer layer film tube, the felt layer can be kept at a uniform thickness when the inner lining material is pressure-bonded to the inner surface of the existing pipe.

Also, by providing an outer layer film tube made of solvent-resistant synthetic resin on the outer surface of the felt layer that is on the existing pipe side, it is possible to prevent groundwater from entering the felt layer when the lining material is pressed against the inner surface of the existing pipe. Since the resin of the felt layer is prevented from leaching to the outside, the ultraviolet curable resin can be uniformly distributed in the felt layer having a uniform thickness, and a synthetic resin pipe having a constant thickness can be formed. .

In addition, by providing a light-transmissive inner layer film tube on the inner surface of the felt layer, the felt layer is irradiated without ultraviolet rays being absorbed by the inner layer film tube, and the outer layer film tube is made to have a white color tone to reflect ultraviolet rays. Since the efficiency is increased, it is possible to effectively irradiate the felt layer with ultraviolet rays.

Furthermore, the outer layer film tube and inner layer film tube prevent groundwater, pressure, etc. from entering the felt layer, so oxygen that is harmful to UV curing can be prevented from entering the felt layer. The felting layer can be cured in a short time by performing the curing action quickly and more reliably, and the working time can be significantly reduced.

Further, since the inner layer film tube is formed of a synthetic resin having a high thermal deformation temperature under load, it can withstand the fluid pressure sufficiently when the lining material is expanded from the inside by the fluid pressure and can prevent the deformation during ultraviolet irradiation. it can.

Furthermore, the inner lining material can be formed by processing a multi-layer sheet consisting of an outer layer film sheet, a felt layer, and an inner layer film sheet, so that the inner lining material can be formed according to the inner diameter of the existing pipe. Can be manufactured.

In addition, since the inner layer film sheet is co-extruded with each film that has the characteristics of low gas permeability and water vapor permeability, the permeability of both gas and water vapor is low, and the contents are the inner layer film even after long-term use. It does not permeate the sheet and diffuse into the felt layer, and it is possible to prevent deterioration and functional deterioration of the felt layer.

[Brief description of drawings]

1 is a perspective view showing a lining material according to an embodiment of the present invention, FIG. 2 is a sectional view showing a felt layer of the above embodiment, FIG. 3 is a perspective view showing a multilayer sheet of the above embodiment, and FIG. FIG. 5 is a sectional view showing the manufacturing method of the above embodiment, and FIG. 5 is a perspective view showing the lining material used in the reverse lining method. 1,1a ... Inner lining material, 2 ... Outer layer film tube, 3 ...
… Felt layer, 4 …… Inner film tube, 5,6 ……
Film tube, 7 ... Multilayer sheet.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 23:22 4F

Claims (2)

[Claims] 1. An outer layer film tube made of a synthetic resin having a solvent resistance and a white color tone, and an inner layer of the outer layer film tube, which is made of acrylic fiber and is dispersed on both inner and outer surfaces, one side or an intermediate layer. A felt layer impregnated with a UV-curable unsaturated polyester resin containing a photoinitiator that absorbs near-ultraviolet rays by punching glass fibers into an integrated body, and the inner surface of the felt layer has a good light-transmitting property and water vapor. -A lining material characterized by comprising an interior film tube made of synthetic resin having low gas permeability and high heat deformation temperature under load. 2. An outer layer film sheet made of a synthetic resin having a solvent resistance and a white color tone, and an acrylic fiber which is adhered to one surface of the outer layer film sheet and is dispersed on both upper and lower surfaces or one surface or an intermediate layer. A felt layer impregnated with a UV-curable unsaturated polyester resin containing a photoinitiator that absorbs near-ultraviolet light is punched and integrated with the glass fiber, and it is adhered to the other side of the felt layer to improve light transmission. , Multi-layer sheet consisting of inner layer film sheet made of synthetic resin with low steam / gas permeability and high heat deformation temperature under load is cut with a width that is 90 to 98% of the inner diameter of the existing pipe plus a certain amount of overlap margin. Then, the cut multi-layer sheet is sewn with the inner layer film sheet inside and the widthwise both ends are overlapped, and each cross section of the overlapped part and the multi-layer sheet is made of the same material as the outer layer film sheet. A method for producing a lining material, which comprises laminating with a film sheet.