JPH0193339A - Pipe lining material - Google Patents

Abstract

PURPOSE:To obtain a lining material for pipelines, which is provided with a resistance to earthquake, shape holding property against external pressure and a resistance to pressure by a method wherein polyester fiber thread is employed as a warp and the filament thread of high rigidity fiber is employed for at least one part of a woof to form a cylindrical fabric having a structure, in which the warps are extended on straight lines and the woofs are bent, thereafter, an air-tight layer is formed on the outer surface of the cylindrical fabric. CONSTITUTION:Since a cylindrical fabric is provided with a structure, in which the woofs 5 of the cylindrical woven fabric 2 are bent the expansion of the diameter of the cylindrical fabric is absorbed by the extension of the bent woofs whereby the woven fabric 2 may be lined along the internal surface of a pipeline. The warps of the cylindrical woven fabric 2 are made of polyester fibrous thread, therefore, a lining layer itself will never be broken, the flow passage of fluid in the pipe may be secured and the cylindrical woven fabric 2 is provided with a resistance to earthquake. A high rigidity fiber is employed for the woofs 5 of the cylindrical woven fabric 2, therefore, a lining material 1 will never cause an excessive radial expansion by the internal pressure therefor under a condition that a pipeline is broken. Further, the cylindrical woven fabric 2 is impregnated with a reactive setting resin and the resin is cured, therefore, the circumferential bending elasticity of the lining layer is high and the cylindrical fabric 2 will not be crushed by an external pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to pipelines mainly buried underground, such as gas pipes, water pipes, sewer pipes, power lines and communication lines, oil pipelines, etc. It relates to a lining material for lining the inner surface, and in particular, it is made by forming a flexible airtight layer on the outer surface of a cylindrical fiber layer, impregnating the fiber layer with a reaction-curing adhesive, Then, it is inserted into the pipe while being turned over using fluid pressure, and the turned-over lining material is pressed onto the inner surface of the pipe using the fluid pressure, and the reaction-curing adhesive is cured and bonded to the inner surface of the pipe. This is a lining material suitable for use in a method of forming a lining layer on the inner surface of a pipe, and when the reaction-curing adhesive is cured, the lining layer itself forms a strong pipe within the pipe. This relates to lining materials that can be

In the past, the purpose of lining pipes was to seal up damaged parts of aging pipes and prevent internal fluids from leaking. In this case, the lining material was required to be airtight and watertight, but the strength and rigidity of the lining material itself was not so much of a problem, and if the pipe ruptured for some reason, It was thought that the inner lining layer would naturally break.

However, in recent years, accidents have occurred where water pipes, sewage pipes, and other pipes have ruptured due to ground subsidence and vibrations from passing vehicles, and as major earthquakes are expected to occur in some urban areas, it is becoming more and more likely that water pipes and sewage pipes will simply deteriorate. In addition to repairing deteriorated pipelines, new pipelines are now being lined as a preventive measure in case they break due to earthquakes, vibrations, etc.

In other words, a so-called pipe-in-pipe structure is created by forming another pipe with a lining layer inside the conduit, and even when the conduit is destroyed by external force, the lining layer remains intact and the internal fluid remains intact. It is required to be able to prevent leakage of water and to secure a flow path for the time being.

In such a structure, when the outer pipe is destroyed by an external force, the inner lining layer does not break, but instead peels off from the pipe and stretches, absorbing energy and discharging gas, tap water, and sewerage. It is required to have so-called seismic isolation, which prevents internal fluids such as water from leaking and secures their flow paths. The conditions in which pipes are destroyed are mainly cracks, breakage, and separation of joints in the pipe circumferential direction. It is required to have an elongation of .

Next, when the pipeline is destroyed due to an earthquake, etc., the external groundwater and earth pressure will directly act on the inner lining layer, so it will have the strength to withstand the groundwater and earth pressure. gender is necessary. This external pressure shape retention greatly contributes to the bending elastic modulus in the circumferential direction of the lining material forming the lining layer, and the higher the bending elastic modulus, the better the external pressure shape retention becomes.

In addition, if pressurized fluid is sent into the pipe,
It must have enough pressure resistance to withstand internal pressure. It is also desirable that the radial expansion rate due to internal pressure is small. If the diameter expansion rate is large, the destruction of the already destroyed pipe will progress, and the diameter will fluctuate due to pressure fluctuations, moving the surrounding soil and forming voids around it. , undesirable.

Prior Art Conventional lining materials include, for example, Japanese Patent Application Laid-Open No. 56-8229.
Those described in Japanese Utility Model Publication No. 56-3619, etc. are known. These products are made by forming an airtight film layer on the outer surface of a cylindrical woven fabric.The cylindrical woven fabric is impregnated with a reaction-curing adhesive, and then turned over using fluid pressure. The pipe is lined by inserting it into the pipe, pressing the turned-over lining material against the inner surface of the pipe using the fluid pressure, and curing the reaction-curing adhesive to adhere it to the inner surface of the pipe. It is something.

Also, JP-A-59-225921 and JP-A-59-2
What is described in Japanese Patent No. 25920 uses a tubular non-woven fabric or a knitted fabric together with a tubular woven fabric in the above-mentioned lining material.

Problems to be Solved by the Invention However, in the lining materials described in the above-mentioned Japanese Unexamined Patent Publication No. 56-8229 and Japanese Utility Model Application Publication No. 56-3619, the cylindrical woven fabric is made of ordinary synthetic fibers. Therefore, when internal pressure is applied to the lining layer, the diameter expansion is large, which may cause further damage if the pipe is destroyed, and it also has poor shape retention under external pressure, and is likely to be crushed by earth pressure. It is in.

Also, JP-A-59-225921 and JP-A-59-2
The structure described in Publication No. 25920 attempts to secure external pressure shape retention and suppress diametric expansion by increasing the thickness of the lining layer, but the manufacturing process for the lining material becomes complicated. Another disadvantage is that the lining layer is thick, making lining work difficult.

The present invention has been made in view of the above problems, and has a diameter that prevents the lining layer from becoming unnecessarily thick, has the seismic isolation properties, external pressure shape retention properties, and pressure resistance required for the lining material. The object of the present invention is to provide a pipe lining material that satisfies the characteristic of low expansion.

As a means of solving the problem, the lining material of the present invention uses polyester fiber yarn as the warp yarn, and uses high-rigidity fiber filament yarn as at least a part of the weft yarn, so that the warp yarn extends in a straight line and the weft yarn It is characterized by forming a cylindrical woven fabric having a bent structure, and forming an airtight layer of rubber or synthetic resin on the outer surface of the cylindrical woven fabric.

The present invention will be explained below with reference to the drawings. FIG. 1 shows a lining material 1 of the present invention, which has a cylindrical woven fabric 2 and an airtight layer 3 of rubber or synthetic resin formed on the outer surface thereof.

The tubular woven fabric 2 is made by weaving warp threads 4 and weft threads 5 into a tubular shape, and the warp threads 4 are polyester threads. Polyester yarn has chemical resistance,
Among ordinary synthetic fiber yarns, it has particularly high tensile strength and elongation at break of more than 10%, and has properties suitable for exhibiting seismic isolation as the lining material.

As the weft yarn 5, it is preferable to use a filament system of high-rigidity fibers with a Young's modulus of 7 ooo1qi4 or more.If the Young's modulus of the fibers constituting the weft yarn 5 is 7000 to 94 or less, the lining is impregnated with a reaction-curing resin. When the layer is formed, the bending elasticity of the lining layer is not sufficiently large, resulting in poor external pressure shape retention.

Examples of highly rigid fibers include glass fibers, carbon fibers, aramid fibers, and metal fibers, among which glass fibers are most suitable. When lining the lining material 1 to form a lining layer, the cylindrical woven fabric 2 is impregnated with a reaction-curing resin, and epoxy resin is most commonly used as the reaction-curing resin.

Therefore, glass fiber is suitable because it has excellent affinity with this epoxy resin and can form a composite material with a high elastic modulus at a relatively low cost using the epoxy resin as a matrix.

Further, the glass fiber preferably has a single fiber diameter of 6 μm or less. The cylindrical woven fabric 2 of the lining material 1 is handled by being folded flat after being woven, but if the diameter of the single fibers is large, the fibers are likely to break at the folding edges, which is not preferable. Again'p! Even when slowly inserting the pipe into the pipe,
By using single fibers with a small diameter, the lining material is flexible and can be easily turned over, and turning can be performed with low pressure.

Moreover, the filament yarn of this high-rigidity fiber is preferably one that has been subjected to bulk processing. Since the cylindrical woven fabric 2 needs to be sufficiently impregnated with a reaction-curable resin, it is preferable to use one that has been made bulky by agitating high-rigidity fibers with an air jet or a steam jet.

The weft yarn 5 may be made of only filament yarns of the above-mentioned high-rigidity fibers, but it may be made by mixing and twisting these high-rigidity fibers with other fibers such as filament yarns of polyester fibers or interlaced m-fiber yarns. It may be something.

In this case, although the modulus of elasticity of the weft thread 5 is slightly lower than that of straw paper, it is possible to easily adjust the diameter expansion of the lining material 1 during lining and the adhesive force with the airtight layer 3.

Generally, when forming FRP using high-rigidity fibers, the high-rigidity fibers are pretreated in advance in order to increase the adhesive strength with the matrix. For example, glass fibers are subjected to silane coupling treatment.

However, even with such treatment, it is difficult to increase the adhesive strength with the flexible airtight NJ3.

In order to increase the adhesive strength between the tubular fabric 2 and the airtight layer 3, it is preferable to use a combination of high-rigidity fibers and interlaced long fiber yarns of polyester fibers.

When using only high-rigidity fibers as the straight weft yarns 5, by using intertwined filament yarns or spun yarns of polyester fibers as a part of the warp yarns 4, the connection between the tubular woven fabric 2 and the airtight layer 3 is improved. Adhesion can be improved.

In the present invention, the tubular woven fabric 2 is formed by weaving warp yarns 4 and weft yarns 5 into a tubular shape. , and the weft thread 5 has a bent structure. The appropriate degree of bending of the weft yarn 5 is such that the shrinkage rate of the weft yarn 5 in the tubular woven fabric 1 is 7 to 25%.

As the weave structure of the tubular woven fabric 2, any appropriate structure can be used, and plain weave, twill weave, ribbed weave, etc. are suitable.

The material for the airtight layer 3 varies depending on the type of pipe, and a material with excellent durability is used depending on the type of fluid passed through the pipe, but commonly used materials include thermoplastic polyester elastic resin and Examples include polyolefin resins.

Function: In the present invention, when lining the inner surface of the pipe with this lining material, the weft threads 5 of the tubular woven fabric 2 have a bent structure, and as a result of this bending stretching, the diameter expands. It can be lined along the inner surface of the pipe.

If the pipe is damaged due to an earthquake or vibration, the lining layer around the damaged part will peel off from the pipe and stretch because the warp threads 4 of the tubular woven fabric 2 are made of polyester fiber yarn. As a result, the lining layer itself is not destroyed, an internal fluid flow path can be secured, and the seismic isolation is achieved.

Furthermore, since high-rigidity fibers are used for the weft threads 5 of the tubular woven fabric 2, the lining material 1 will not expand excessively in diameter due to internal pressure when the pipe line is damaged.

Further, the cylindrical woven fabric 2 is impregnated with a reaction-curing resin and cured.
In the state in which the lining layer is formed, since high-rigidity fibers are used as the weft threads 5, the lining layer has a high bending elastic modulus in the circumferential direction and is not crushed by external pressure. Therefore, the above-mentioned external pressure shape retention property is excellent.

Effects of the Invention Therefore, according to the present invention, all of the performances required for the lining material of the pipeline, such as seismic isolation, external pressure shape retention, and small diametric expansion, are satisfied. Moreover, since these requirements are met without making the thickness of the lining layer unnecessarily large, the fibrous layer of the lining material 1 consists of only a single cylindrical woven fabric 2, which is easy to manufacture. ,
Lining work can also be easily done with low fluid pressure.

Moreover, in the present invention, the structure of the tubular woven fabric 2 is such that the weft threads 5 are bent, so even if high-rigidity fibers that do not stretch very well are used as the weft threads 5, the weft threads 5 can be easily used for lining work. Diameter expansion is ensured and the inner surface of the conduit can be appropriately lined.

In addition, by using thin single fibers with a diameter of 6μ or less as the high-rigidity fibers used for the weft thread 5, the tubular woven fabric 2 itself is extremely soft and supple, and does not fold during the weaving process. Since the small threads do not break when the pipe is lined, and slippage between the single fibers is likely to occur, the diameter expands appropriately when lining the pipe, making it easy to follow the inner surface of the pipe.

Furthermore, by using bulky processed yarn made of highly rigid fibers,
The amount of reaction-curing adhesive impregnated is increased, and the thickness of the lining layer can be ensured. Further, by using intertwined long fiber yarn such as polyester fiber in combination with the weft yarn 5, the adhesive force between the tubular woven fabric 2 and the airtight layer 3 is improved.

[Brief explanation of the drawing]

The drawings show the lining material of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a partially enlarged cross-sectional view, and FIG. 3 is a partially enlarged central longitudinal sectional view. 1... Lining material 2... Tubular woven fabric 3... Airtight layer 4...
Warp thread 5...Weft thread

Claims (1)

[Scope of Claims] 1. A tubular woven fabric having a structure in which polyester fiber yarn is used as the warp yarn and high-rigidity fiber filament yarn is used as at least a portion of the weft yarn, so that the warp yarn extends almost linearly and the weft yarn is bent. A pipe lining material 2 characterized by forming an airtight layer of rubber or synthetic resin on the outer surface of the tubular woven fabric. The lining material 3 for a conduit according to claim 1, characterized in that the filament yarn of the high-rigidity yarn is bent so that the diameter of the single fiber is 7 to 25%. The pipe lining material 4 according to claim 1 or 2, characterized in that it is a glass fiber filament yarn with a diameter of 6μ or less.The filament yarn of the high-rigidity fiber is a bulky textured yarn. A pipe lining material 5 according to claim 1, 2 or 3, wherein the weft yarn is a mixture of filament yarns of the high-rigidity fibers and polyester interlaced filament yarns. Claims 1, 2, and 3 are characterized in that:
Lining material 6 for pipes according to item 6 or item 4 A patent claim characterized in that the warp of the tubular woven fabric is a mixture of polyester filament yarn and polyester interlaced filament yarn or polyester spun yarn. The lining material for pipes according to the scope of item 1, 2, 3, 4, or 5.