JPH0794146B2 - Pipe liner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to gas pipelines, water pipelines, sewer pipelines, power line and communication line laying pipelines, oil pipelines, and other pipelines mainly buried in the ground. The present invention relates to an inner lining material for lining an inner surface, in particular, a flexible airtight layer is formed on the outer surface of a tubular fiber layer, and the fiber layer is impregnated with a reaction-curable resin. Is turned inside out with fluid pressure and inserted into the inside of the pipeline, and the inside liner that has been turned inside is crimped to the inside surface of the pipeline with the above fluid pressure, and the reaction-curing resin is cured and adhered to the inside surface of the pipeline. An inner lining material suitable for application in a method of forming an inner lining layer, and capable of forming a strong tube in a duct by the inner lining layer itself when the reaction-curable resin is cured. Is about

In the past, the lining of pipes was performed for the purpose of blocking the damaged parts of the aged pipes and preventing the 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 was not so much of a problem, and if the pipeline broke for some reason, It was thought that the lining layer on the inner surface would naturally break.

However, in recent years, when pipeline accidents such as water pipes and sewer pipes have been broken due to ground subsidence and vibrations of passing vehicles, and when a large earthquake is expected to occur in some urban areas, it simply deteriorates. In addition to repairing the damaged pipelines, new pipelines are now lined with preventive linings in case the pipeline breaks due to an earthquake or vibration.

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

In such a structure, first, when the outer pipeline is destroyed by an external force, the inner lining layer is not destroyed, but is peeled from the pipeline and stretched to absorb energy, and gas, tap water, and sewerage are seized. It is required to have a so-called seismic isolation property that prevents leakage of internal fluid such as water and secures the flow path. Thus, the situation where the pipe is destroyed is mainly cracks in the pipe circumferential direction, breakage, and detachment of the joint portion, and it has sufficient strength in the length direction as an lining material, and about 10 to 20%. It is required to have an elongation of.

On the other hand, when pressurized fluid is being sent into the pipeline,
The lining material needs to have a pressure resistance sufficient to withstand the internal pressure, and it is desirable that the diametric expansion coefficient due to the internal pressure is small. If the pipe expands excessively due to the internal pressure after lining, the broken pipe will be further destroyed, and the diameter will fluctuate due to pressure fluctuations to move the surrounding soil, creating voids around the pipe. It is not preferable because it is formed.

Next, when the pipeline is destroyed by an earthquake, etc., the external groundwater pressure and earth pressure directly act on the inner lining layer, so the strength is sufficient to withstand this external pressure such as groundwater pressure or earth pressure. That is, the so-called external pressure shape retention property is required. In particular, since the internal pressure is not acting on the sewage conduit and the laying pipelines such as electric power lines and communication lines, if the pipe is damaged, the external pressure such as groundwater pressure or earth pressure directly acts on the lining material. Formability is an essential requirement.

Thus, this external pressure shape retention property largely contributes to the bending elastic modulus and thickness of the lining material forming the lining layer in the circumferential direction. Since the lining material can be regarded as a thin-walled cylindrical tube,
It is considered that the external pressure shape retention property increases in proportion to the cube of the thickness and 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 forming on the lining material when the lining material is attached to the inside of the pipeline.To do this, inflate the lining material formed slightly smaller than the inner diameter of the pipeline so that the lining material does not run along the inner surface of the pipeline. It is also necessary to line the inner wall with the inner wall, and it is also required that the inner diameter expands moderately at a low inner pressure.

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 those in which an airtight coating layer is formed on the outer surface of a tubular woven fabric, and the tubular woven fabric is impregnated with a reaction-curable resin, which is turned over by fluid pressure. By inserting the lining material, which has been inserted into the pipeline, and crimping the inside lining material to the inner surface of the pipeline with the fluid pressure, and then curing the reaction-curable resin, and adhering the lining material to the inner surface of the pipeline. It is a lining on the road.

Further, the materials described in JP-A-59-225921 and JP-A-59-225920 are a combination of a tubular woven fabric and a tubular non-woven fabric or knitted fabric in the lining material.

Problems to be Solved by the Invention However, the above-mentioned JP-A-56-8229 and JP-A-56-36
In the lining material described in Japanese Patent Publication No. 19, since the tubular woven fabric is formed of ordinary synthetic fibers, when the inner lining layer is subjected to internal pressure, the radial expansion is large, and when the pipe line is broken. There is a risk that the damage will progress. In addition, the shape retention of external pressure is poor, and there is a possibility of being crushed by external pressure from groundwater or earth pressure.

Further, in the structures described in JP-A-59-225921 and JP-A-59-225920, the thickness of the lining layer is increased to secure the external pressure shape retention property and try to suppress the radial expansion. However, the manufacturing process of the lining material becomes complicated. Further, the flexibility of the lining material itself is lowered, and it is difficult to manufacture a long lining material, and it is also difficult to perform a long lining work using this lining material.

The present invention has been made in view of the above circumstances, in which the lining layer does not become thicker than necessary, and has the seismic isolation, the external pressure-retaining property, and the pressure resistance required for the lining material, and an appropriate degree. It is an object of the present invention to provide a liner lining material that satisfies the various properties of having a diameter expansion property of 1.

Means for Solving the Problems Thus, the present invention forms an airtight layer of rubber or synthetic resin on the outer surface of a tubular woven fabric formed by weaving warp yarns and weft yarns in a tubular shape, and the inside of the tubular woven fabric is formed. Characterized in that a high-rigidity yarn is provided as a weft yarn in a tensioned state, and a tubular woven fabric obtained by weaving the weft yarn and the warp yarn in a tubular shape is fitted in a loose state. Is.

The present invention will be described below with reference to the drawings. The drawings show an inner lining material 1 of the present invention. The inner lining material 1 is inserted inside a pipe line while being turned upside down by fluid pressure, and is lined inside the pipe line in a state where the inner and outer surfaces are inverted. .

1 and 2 show an inner lining material 1 according to the present invention. The inner lining material 1 has an outer cylindrical woven fabric 2 on which an airtight layer 3 of rubber or synthetic resin is formed. The inner tubular woven fabric 4 is fitted inside the outer tubular woven fabric 2.

The outer tubular cloth 2 is formed by weaving warp threads 5 and weft threads 6 into a tubular shape, and the airtight layer 3 is formed on the outer surface of the outer tubular cloth 2. .

The inner tubular woven cloth 4 is also made of warp threads 7 and weft threads 8.
And are woven in a tubular shape, and a high-rigidity thread such as glass fiber is used as the weft thread 8, and the high-rigidity thread is arranged in a substantially tense state. Further, as the weft thread 8, it is preferable to use a bulky processed thread of glass fiber. Warp thread 7
Can use an appropriate synthetic fiber yarn such as polyester yarn.

The inner tubular woven fabric 4 is loosely fitted inside the outer tubular woven fabric 2, and a part thereof forms a folded portion 9.

Regarding the outer tubular woven fabric 2, normal warp yarns 5 and weft yarns 6 may be ordinary synthetic fiber yarns such as polyester yarns and nylon yarns, but the lining material 1 exhibits sufficient seismic isolation. For this purpose, it is preferable to use a polyester yarn having a high strength and an elongation at break of about 10% or more.

Further, as the weft thread 6, a high-rigidity thread such as glass fiber or aromatic polyamide fiber may be used.

Further, at least one of the warp yarn 5 and the weft yarn 6 is mixed with a polyester filament yarn and a polyester spun yarn or entangled long fiber yarn in order to improve the adhesive force between the outer tubular woven fabric 2 and the airtight layer 3. Preference is given to using twisted yarns.

The thickness and weaving density of the warp yarn 5 and the weft yarn 6 differ depending on the diameter of the pipe line to be lined and the use, but generally 500
It is preferable to use a yarn having a thickness of about 5,000 d and woven this densely to form the outer tubular woven fabric 2.

Next, the inner tubular woven fabric 4 will be described. As the weft yarn 8, a highly rigid yarn is used. As the weft thread 8, it is preferable to use a thread that is sufficiently thicker than the weft thread 6 that constitutes the outer tubular woven fabric 2. Specific examples of high-rigidity yarns include:
Examples thereof include glass fiber, aromatic polyamide fiber, wholly aromatic polyester fiber, carbon fiber, metal fiber, and ultra-high degree of polymerization polyethylene fiber. Among these fibers, glass fiber is most suitable.

When lining this lining material 1 to form a lining layer,
The outer tubular woven fabric 2 is impregnated with a reaction curable resin, and epoxy resin and unsaturated polyester resin are most commonly used as the reaction curable resin. Therefore, the weft thread 8 of the inner tubular woven cloth 4 is
As the glass fiber, a glass fiber having a good affinity with the epoxy resin or the unsaturated polyester resin and capable of forming a composite material having a large elastic modulus by using these resins as a matrix is preferable.

The thickness of the weft thread 8 is also thicker than the weft thread 6 of the outer tubular woven fabric 2 and the thickness of the inner tubular woven fabric 4 is 2 to 10 mm, though it depends on the required degree of external pressure shape retention. It is appropriate to set the thickness to a degree. Further, by using a bulky processed yarn as the weft yarn 8, the apparent thickness is increased,
It is preferable because the reaction-curable resin can be easily impregnated in multiple layers.
The air jet method and the steam jet method are known as bulking methods.

The warp threads 7 of the inner tubular woven cloth 4 may be ordinary synthetic fibers such as polyester threads and nylon threads, or the same warp threads as the warp threads 5 of the outer tubular woven cloth 2 may be used.

Furthermore, the weft threads 8 are arranged in a state of being almost tense, and it is preferable that the weft threads 8 are arranged with a considerable density, and at least in the unloaded state, the inner surface of the lining material 1 is
It is desirable that 50% or more of the weft threads 8 be covered. If the coverage rate of the weft threads 8 is low, the reaction-curable resin cannot be included in the gaps between the weft threads 8 and the coverage rate of the resin as the lining material 1 is reduced, and the external pressure shape retention property is sufficiently improved. I can't.

Also, the warp threads 7 are preferably arranged much coarser than the outer tubular woven fabric 2. As a result, the weft threads 8 float between the warp threads 7 for a long time, and a large amount of the reaction curable resin can be contained therein.

Thus, in the present invention, the inner tubular woven fabric 4 is inserted in the outer tubular woven fabric 2 in a loose state, and the extra length of the looseness forms the folded portion 9 in part. ing.

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

The material of the airtight layer 3 in the lining material 1 varies depending on the type of the pipeline, and a material having excellent durability is used depending on the type of fluid passed through the pipeline. Particularly widely used ones are thermoplastic polyester elastic resins, thermoplastic polyurethane elastic resins, polyolefin resins and the like.

Action 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, the fiber layer is impregnated with the reaction-curable resin, and the lining material 1 is turned over by fluid pressure. The inner lining 1 which has been turned upside down by fluid pressure, and presses the inner lining 1 onto the inner surface of the pipe.
The reaction-curable resin is cured to form an FRP structure pipe with the fiber layer and the reaction-curable resin, and the pipe is adhered to the inner surface of the conduit by the reaction-curable resin.

Thus, in the present invention, since the inner tubular woven fabric 4 using the high rigidity yarn for the weft yarn 8 has slack, the diameter expansion of the outer tubular woven fabric 2 is hindered by the high rigidity yarn. However, the lining material appropriately expands in diameter by the fluid pressure, and the high-rigidity yarn is crimped to the inner surface of the pipe line in a state in which it is almost tense.

When the lining material 1 of the present invention is inserted into the inner surface of the pipeline, the surface of the lining material 1 facing the pipeline is
Since the weft thread 8 of the inner tubular woven fabric 4 made of high-rigidity thread is provided, the weft thread 8 can include a large amount of the reaction curable resin.

Furthermore, when the pipeline is damaged by an earthquake or vibration, the fiber layer of the lining material 1 has a woven structure,
The lining layer around the damaged part can be peeled off from the duct and extended, and even when the duct is broken, the lining layer itself is not destroyed and the internal fluid flow path is It can be secured and has seismic isolation.

Further, since the weft thread 8 made of high-rigidity thread is provided in the outermost layer of the outer tubular woven cloth 2, the inner lining material 1 does not excessively expand in diameter by the internal pressure in the state where the conduit is damaged.

Further, the liner 1 is impregnated with a reaction-curable resin and cured,
Since a large amount of high-rigidity yarns are arranged in the circumferential direction in the state where the lining layer is formed, the bending elastic modulus in the circumferential direction of the lining layer is high and is not crushed by external pressure. Therefore, the external pressure-retaining property is excellent.

[Effects of the Invention] Therefore, according to the present invention, all the performances required for the lining material of the pipe, that is, the seismic isolation property, the external pressure retaining property and the small radial expansion, are satisfied. Moreover, it is possible to give the lining layer sufficient rigidity without increasing the thickness of the lining layer more than necessary, and by making the high-rigidity yarn sufficiently thick, it is possible to obtain a high degree of external pressure retention. It will be.

Further, by reducing the density of the warp yarns 7 of the inner tubular woven fabric 4, the weft yarns 8 made of high-rigidity yarns float on the surface of the outer tubular woven fabric 2 for a long time, so that even if a large amount of high-rigidity yarns are used, 1 is very flexible and easy to handle, and even when the lining material 1 is turned inside out and inserted into the pipeline, the lining material 1 can be easily inverted, and the inside can be easily turned over with a small fluid pressure. You can do it.

Furthermore, by using a high-rigidity thread that is bulked as the weft thread 8 of the inner tubular woven cloth 4, the amount of the reaction-curable resin impregnated increases and the thickness of the lining layer can be secured. Further, the weft yarn 6 of the outer tubular woven fabric 2 is used together with the filament yarn such as polyester fiber and the spun yarn or the entangled long fiber yarn, whereby the adhesive force between the outer tubular woven fabric 2 and the airtight layer 3 is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of the lining material of the present invention, and FIG. 2 is an enlarged transverse sectional view of a part thereof. 1 ... Inner lining material, 2 ... Outer tubular woven fabric 3 ... Airtight layer, 4 ... Inner tubular woven fabric 5 ... Outer tubular woven warp yarn, 6 ... Outer tubular woven fabric weft yarn 7 ...... Internal tubular woven warp threads, 8 …… Inner tubular woven weft threads 10 …… Cylindrical nonwoven fabric

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Seshita 2-24-12 Koshienguchi, Nishinomiya-shi, Hyogo (56) Reference JP-A-61-143129 (JP, A)

Claims (9)

[Claims] 1. An airtight layer of rubber or synthetic resin is formed on the outer surface of a tubular woven fabric formed by weaving warp yarns and weft yarns in a tubular shape, and high rigidity yarns are used as weft yarns inside the tubular woven fabric.ヾ Pipe liner lining material, characterized in that a tubular woven fabric, which is arranged in a tensioned state and is made by weaving the weft thread and the warp thread in a tubular shape, is fitted in a loose state. 2. The pipe according to claim 1, wherein the weft thread forming the inner tubular woven cloth is a thread sufficiently thicker than the weft thread forming the outer tubular woven cloth. Road lining 3. The liner lining material according to claim 1, wherein the weft thread constituting the inner tubular woven cloth is a filament thread of glass fiber. 4. The liner lining material according to claim 1, characterized in that the weft thread constituting the inner tubular woven cloth is a bulk-processed thread of glass fiber. 5. The liner lining material according to claim 1, wherein the warp threads constituting the inner tubular woven fabric are polyester threads. 6. The liner lining material according to claim 1, wherein the weft thread constituting the outer tubular woven fabric is a polyester thread. 7. The liner lining material according to claim 1, wherein the warp threads constituting the outer tubular woven fabric are polyester threads. 8. The liner lining material according to claim 1, wherein the weft thread constituting the outer tubular woven fabric is a high-rigidity thread. 9. The weft yarn constituting the outer tubular woven fabric is a glass fiber yarn.
Liner lining material