JP2630919B2 - Pipe liner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended for lining pipes mainly buried underground, such as gas pipes, water pipes, sewer pipes, power lines and communication lines, oil pipelines, and the like. In particular, a flexible airtight layer is formed on the outer surface of a cylindrical fiber layer, and the fiber layer is impregnated with a reaction-curable resin, and this is turned over by fluid pressure. While the pipe is inserted into the pipe, the inverted lining material is pressed against the pipe inner surface by the fluid pressure, and the reaction-curable resin is cured and adhered to the pipe inner surface to form a lining layer on the pipe inner surface. The present invention relates to a lining material suitable for being applied in a forming method, wherein the lining layer itself can form a strong pipe in a pipe by curing the reaction-curable resin.

[0002] In the past, the lining of pipelines has been performed for the purpose of closing damaged portions of aging pipelines and preventing leakage of internal fluid. In this case, the lining material was required to have air-tightness and water-tightness, but the strength and rigidity of the lining material itself were not so much a problem, as long as the pipeline was broken for any reason. It was naturally considered that the lining layer on the inner surface was also broken.

[0003] However, in recent years, accidents such as breakage of water pipes and sewer pipes due to land subsidence and vibrations of passing vehicles have occurred, and a large earthquake is expected to occur in some urban areas. In addition to simply repairing aging pipes, new pipes are being laid out in a preventive manner in case the pipes break due to an earthquake or vibration.

[0004] That is, another pipe is formed by a lining layer in a pipeline to adopt a so-called pipe-in-pipe structure. Even when the pipeline is broken by an external force, the lining layer is still in place, and It is required to prevent leakage of the fluid and to secure a flow path for the time being.

In such a structure, first, when the outer pipe is broken by an external force, the inner lining layer is peeled off from the pipe without being broken, and absorbs energy, thereby absorbing gas and water. It is required to have a so-called seismic isolation property that prevents leakage of internal fluids such as water and sewage water and secures its flow path. The conditions in which the pipe is broken are mainly cracks and breaks in the circumferential direction of the pipe and detachment of the joint portion. The pipe has sufficient strength in the length direction as a lining material, and about 10 to 20%. Is required.

On the other hand, when a pressurized fluid is being sent into the pipeline, the lining material must have a pressure resistance enough to withstand the internal pressure, and the rate of radial expansion due to the internal pressure is small. Desirably. If the line expands excessively due to the internal pressure after lining, the destruction of the destroyed pipeline will proceed further, and the diameter will fluctuate due to the fluctuation of the pressure, moving the surrounding soil and creating a gap around the pipeline. It is not preferable because it is formed.

Next, when the pipeline is destroyed by an earthquake or the like, the external groundwater pressure or earth pressure acts directly on the inner lining layer, so that it can sufficiently withstand the external pressure such as groundwater pressure or earth pressure. It is necessary to have a so-called external pressure-retaining property that has only sufficient strength. Especially in laying pipelines such as sewer pipes and power lines and communication lines, since internal pressure does not act, if the pipe breaks, external pressure such as groundwater pressure or earth pressure directly acts on the lining material. Formability is an essential requirement.

[0008] The external pressure-retaining property greatly contributes to the circumferential bending elastic modulus and thickness of the lining material forming the lining layer. Since the lining material can be regarded as a thin-walled cylindrical tube, it is considered that the external pressure retaining property is proportional to the cube of the thickness and increases in proportion to the bending elastic modulus. That is, the larger the thickness and the higher the flexural modulus, the better the external pressure shape retention.

In addition, it is necessary to prevent wrinkles from being formed in the lining material when the lining material is applied to the inside of the pipeline. It is necessary that the material be expanded radially at a low internal pressure.

[0010]

2. Description of the Related Art As conventional lining materials, those described in, for example, JP-A-56-8229 and JP-A-56-3619 are known. These are formed by forming an air-tight coating layer on the outer surface of a tubular woven fabric, and impregnating the tubular woven fabric with a reaction-curable resin, and turning it over with a fluid pressure. The pipe is inserted into the pipe, the inverted lining material is pressed against the inner surface of the pipe by the fluid pressure, and then the reaction-curable resin is cured to bond the lining material to the inner surface of the pipe. They are lined with roads.

[0011] Further, those described in JP-A-59-225921 and JP-A-59-225920 are those in which a tubular nonwoven fabric or a knitted fabric is used in combination with a tubular woven fabric in the lining material. .

[0012]

However, in the lining material described in the above-mentioned JP-A-56-8229 and JP-A-56-3619, the tubular woven fabric is formed of ordinary synthetic fibers. Therefore, when the internal pressure is applied to the lining layer, the radial expansion is large, and when the pipe is broken, there is a possibility that the damage will progress. In addition, it has poor external pressure retention, and is likely to be crushed by external pressure due to groundwater or earth pressure.

Further, the structures described in JP-A-59-225921 and JP-A-59-225920 secure the external pressure-retaining property by increasing the thickness of the lining layer and suppress the radial expansion. In this case, the manufacturing process of the lining material becomes complicated. Further, the flexibility of the lining material itself is reduced, so that it is difficult to manufacture a long lining material, and it is also difficult to perform a long lining work using this lining material.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and does not make the lining layer unnecessarily thick, and has the seismic isolation, external pressure-retention and pressure resistance required for the lining material. An object of the present invention is to provide a pipe liner which satisfies various characteristics of having a suitable diameter expansion property.

[0015]

According to the present invention, an airtight layer of rubber or synthetic resin is formed on the outer surface of a tubular woven fabric obtained by weaving a warp yarn and a weft yarn in a tubular shape. And a tubular woven fabric formed by weaving a weft made of high-rigidity yarn into a warp yarn in a tubular shape.

The present invention will be described below with reference to the drawings. The drawing shows a lining material 1 of the present invention. The lining material 1 is inserted into a pipe while turning it over by a fluid pressure, and is lined with the pipe in a state where the inner and outer surfaces are inverted. .

FIGS. 1 and 2 show a lining material 1 according to the present invention. The lining material 1 has an airtight layer 3 of rubber or synthetic resin formed on the outer surface of an outer tubular woven fabric 2. A tubular nonwoven fabric 10 is fitted inside the outer tubular woven fabric 2, and an inner tubular woven fabric 4 is fitted inside the tubular nonwoven fabric 10.

The outer tubular woven fabric 2 is formed by weaving the warp yarns 5 and the weft yarns 6 in a tubular shape, and the airtight layer 3 is formed on the outer surface of the outer tubular woven fabric 2. I have.

As for the outer tubular woven fabric 2, ordinary warp yarns 5 and weft yarns 6 can be ordinary synthetic fiber yarns such as polyester yarns and nylon yarns. In order to exhibit the property, it is preferable to use a polyester yarn having a large strength and an elongation at break of about 10% or more.

As the weft yarn 6, a highly rigid yarn such as glass fiber or aromatic polyamide fiber can be used.

At least one of the warp yarn 5 and the weft yarn 6 of the outer tubular woven fabric 2 is provided with a polyester filament yarn in order to improve the adhesive strength between the outer tubular woven fabric 2 and the airtight layer 3. It is preferable to use a yarn obtained by mixing and twisting a polyester spun yarn or an interlaced long fiber yarn.

Although the thickness and weaving density of the warp yarns 5 and the weft yarns 6 vary depending on the diameter of the pipeline to be lined and the purpose of use, generally, a yarn having a thickness of about 500 to 5000 d is used. It is preferable that the outer tubular woven fabric 2 is woven.

As the tubular nonwoven fabric 10, a nonwoven fabric of a synthetic fiber such as polyester can be used, and a nonwoven fabric of a high rigidity fiber such as a glass fiber can also be used. The tubular non-woven fabric 10 may be a non-woven fabric formed into a tubular shape from the beginning, or may be a tubular non-woven fabric obtained by rolling a sheet-like non-woven fabric and joining both edges thereof.

The inner tubular woven fabric 4 is formed by weaving a warp yarn 7 and a weft yarn 8 in a tubular shape. As the weft yarn 8, a high-rigidity yarn such as a glass fiber yarn is used. The high-rigidity yarn is preferably disposed in a substantially elongated state. It is preferable that the weft 8 is a bulky glass fiber yarn. As the warp yarn 7, an appropriate synthetic fiber yarn such as a polyester yarn can be used.

It is preferable that the weft 8 of the inner tubular woven fabric 4 be a thread sufficiently thicker than the weft 6 constituting the outer tubular woven fabric 2. Specific examples of the high-rigidity yarn constituting the weft yarn 8 of the inner tubular woven fabric 4 include glass fiber, aromatic polyamide fiber, wholly aromatic polyester fiber, carbon fiber, metal fiber, and ultra-highly polymerized polyethylene fiber. Of these fibers, glass fibers are the most suitable.

It is preferable that the inner tubular woven fabric 4 is loosely fitted inside the tubular nonwoven fabric 10, and a folded portion 9 is formed in a part of the tubular woven fabric 4. It is appropriate to make them loose.

When the lining material 1 is lined to form a lining layer, the outer tubular woven fabric 2 is impregnated with a reaction-curable resin. As the reaction-curable resin, an epoxy resin or an unsaturated polyester resin is most commonly used. Is done. Therefore, as the weft thread 8 of the inner tubular woven fabric 4, glass fiber which is excellent in affinity with the epoxy resin and the unsaturated polyester resin and can form a composite material having a large elastic modulus by using these resins as a matrix is used. It is suitable.

Although the thickness of the weft yarn 8 varies depending on the required degree of external pressure retention, it is sufficiently thicker than the weft yarn 6 of the outer tubular woven fabric 2 and the thickness of the inner tubular woven fabric 4 is reduced. 2-10
It is appropriate that the thickness is about mm. Use of a bulky processed yarn as the weft yarn 8 is preferable because the apparent thickness increases and a large amount of the reaction curable resin is easily impregnated. As a method of bulking, an air jet method and a steam jet method are known.

As the warp yarns 7 of the inner tubular woven fabric 4, ordinary synthetic fibers such as polyester yarns and nylon yarns can be used, and the same yarns as the warp yarns 5 of the outer tubular woven fabric 2 can be used. .

Further, the weft yarn 8 is preferably arranged in a substantially stretched state, and is preferably arranged with a considerable density. At least in a no-load state, the weft yarn 8 is formed on the inner surface of the lining material 1. % Or more is desirably covered with the weft yarn 8. When the coverage by the weft yarns 8 is low, the reaction-curable resin cannot be included in the space between the weft yarns 8, and the inclusion ratio of the resin as the lining material 1 is reduced, and the external pressure retaining property is sufficiently improved. Can not do.

It is preferable that the warp yarns 7 are arranged much coarser than the outer tubular woven fabric 2. As a result, the weft yarn 8 floats long between the warp yarns 7 and can contain a large amount of the reaction-curable resin.

In the present invention, the inner tubular woven fabric 4
Is inserted in the outer tubular woven fabric 2 in a slack state, and the slack extra length preferably forms the folded portion 9 in part.

The structures of the inner and outer tubular woven fabrics 2 and 4 are not particularly limited, and an appropriate structure such as plain weave or twill weave can be used.

The material of the airtight layer 3 of the lining material 1 differs depending on the type of the conduit, and a material having excellent durability is used according to the type of the fluid passed through the conduit. Particularly widely used, thermoplastic polyester elastic resin,
Examples include thermoplastic polyurethane elastic resin and polyolefin resin.

[0035]

In order to line the lining material 1 of the present invention in a pipeline, a reaction-curable resin is applied to the lining material 1, and the fiber layer is impregnated with the reaction-curable resin. Is turned upside down with fluid pressure and inserted into the pipe line, and the turned upside down lining material 1 is expanded by fluid pressure, this lining material 1 is pressed against the inner surface of the pipe line, and the reaction-curable resin is cured to form a fiber layer. A pipe having an FRP structure is formed with the reaction-curable resin, and the pipe is bonded to the inner surface of the pipe with the reaction-curable resin.

In the present invention, the tubular nonwoven fabric 10 is provided as an intermediate layer, and the tubular nonwoven fabric 10 is also impregnated with the reaction-curable resin, so that a larger amount of the reaction-curable resin can be included. Therefore, a pipe having an FRP structure having a sufficient thickness and reinforced with high-rigidity yarn is formed inside the pipe.

When the pipeline is damaged by an earthquake or vibration, the fiber layer of the lining material 1 has a woven structure, so that the lining layer around the damaged portion is peeled off from the pipeline. It can be extended, and even if the pipeline is broken, the lining layer itself is not broken, the flow path of the internal fluid can be secured, and the base has seismic isolation.

Further, in the present invention, since the inner tubular woven fabric 4 using the high-rigidity yarn for the weft 8 has slack, the radial expansion of the outer tubular woven fabric 2 is inhibited by the high-rigidity yarn. Instead, the lining material is appropriately radially expanded by the fluid pressure, and the high-rigidity yarn is pressed against the inner surface of the pipeline in a substantially elongated state. In a state where the lining material 1 is inserted into the inner surface of the pipeline, the weft thread 8 of the inner tubular woven fabric 4 made of a high-rigidity thread is disposed on the surface of the lining material 1 facing the pipeline, The weft 8 can include a large amount of a reaction-curable resin.

Further, since the weft thread 8 made of a high-rigidity thread is provided on the outermost layer of the outer tubular woven fabric 2, the liner 1 may expand excessively due to the internal pressure when the pipeline is broken. Absent.

Further, since a large amount of high-rigidity yarns are arranged in the circumferential direction in a state where the lining material 1 is impregnated with the reaction-curable resin and cured to form the lining layer, the bending elasticity of the lining layer in the circumferential direction is increased. High rate, not crushed by external pressure. Therefore, the above-mentioned external pressure retention is excellent.

[0041]

According to the present invention, therefore, all of the performances required for the liner of the pipe, such as seismic isolation, external pressure retention, and small radial expansion, are satisfied. In addition, the lining layer can have sufficient rigidity without making the lining layer unnecessarily thick, and the high-rigidity yarn is made sufficiently thick to have a high degree of external pressure retention. It becomes.

Further, since the density of the warp yarns 7 of the inner tubular woven fabric 4 is reduced, the weft yarns 8 made of high-stiffness yarns float on the surface of the outer tubular woven fabric 2 for a long time. In addition, the lining material 1 is very flexible and easy to handle, and when the lining material 1 is turned upside down and inserted into a pipeline, the lining material 1 is easily inverted, and can be easily turned over with a small fluid pressure. You can do it.

Further, by using a high-rigidity yarn subjected to bulk processing as the weft 8 of the inner tubular woven fabric 4, the impregnation amount of the reaction-curable resin increases, and the thickness of the lining layer can be ensured. it can. In addition, by using a filament yarn such as a polyester fiber and a spun yarn or an entangled long fiber yarn in combination with the weft yarn 6 of the outer tubular woven fabric 2, the adhesive strength between the outer tubular woven fabric 2 and the airtight layer 3 is improved.

Further, since the tubular nonwoven fabric is sandwiched between the inner and outer tubular woven fabrics, the effect of increasing the rigidity like a plywood is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lining material of the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of the lining material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lining material 2 ... Outer tubular woven fabric 3 ... Airtight layer 4 ... Inner tubular woven fabric 5 ... Warp yarn of outer tubular woven fabric 6 ... Weft yarn of outer tubular woven fabric 7 ... Inside Warp yarn of tubular woven fabric 8 Weft yarn of inner tubular woven fabric 10 Cylindrical nonwoven fabric

Claims (12)

(57) [Claims] An airtight layer of rubber or synthetic resin is formed on an outer surface of an outer tubular woven fabric formed by weaving a warp and a weft in a tubular shape, and a tubular nonwoven fabric is fitted inside the outer tubular woven fabric. And an inner tubular woven fabric formed by weaving a weft made of a high-rigidity yarn into a warp in a tubular shape in the tubular nonwoven fabric, wherein the lining material for a pipeline is provided. 2. A weft comprising high rigidity yarns of the inner tubular woven fabric is disposed in a substantially elongated state, and the inner tubular woven fabric is loosely fitted into the tubular nonwoven fabric. The liner according to claim 1, wherein the liner is provided. 3. The weft yarn constituting the inner tubular woven fabric,
2. The liner according to claim 1, wherein the yarn is sufficiently thicker than a weft yarn constituting the outer tubular woven fabric. 4. The weft constituting the inner tubular woven fabric,
Characterized by being a glass fiber filament yarn,
The lining material of the pipeline according to claim 1. 5. The weft yarn constituting the inner tubular woven fabric,
2. The liner according to claim 1, wherein the liner is a bulky yarn of glass fiber. 6. The liner according to claim 1, wherein the warp yarns constituting the inner tubular woven fabric are polyester yarns. 7. The liner according to claim 1, wherein the weft yarns constituting the outer tubular woven fabric are polyester yarns. 8. The liner according to claim 1, wherein the warp yarns constituting the outer tubular woven fabric are polyester yarns. 9. The liner according to claim 1, wherein the weft yarn constituting the outer tubular woven fabric is a high-rigidity yarn. 10. The pipe liner according to claim 1, wherein the weft yarn constituting the outer tubular woven fabric is a glass fiber yarn. 11. The pipe liner according to claim 1, wherein the tubular nonwoven fabric is made of polyester fibers. 12. The liner according to claim 1, wherein the tubular non-woven fabric is made of glass fiber.