JPS6340664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for lining pipes mainly buried underground, such as gas pipes, water pipes, sewer pipes, power lines, communication lines, etc., oil pipelines, etc. , relating to lining materials.

In recent years, the inner surface of underground pipelines has been lined with lining for the purpose of repairing and reinforcing aging underground pipelines as described above. An adhesive is applied to the inner surface of a shaped lining material, and this lining material is inserted into the pipe while being turned over by fluid pressure, and the lining material is bonded to the inner surface of the pipe via the adhesive. ing. This method does not require digging up the entire length of the pipe, it is sufficient to form manholes only at both ends of the pipe section to be lined, and the lining work itself can be completed in a short time on a long pipe. Furthermore, it is an extremely excellent method that can be used even in conduits with many bends, and has been attracting particular attention in recent years.

The lining materials conventionally used in this construction method include thin flexible plastic tubes, lining materials with airtight and watertight coatings formed on the outer surface of non-woven fabric, or lining materials previously applied by the applicant.
Lining materials in which a rubber or synthetic resin coating is formed on the outer surface of a cylindrical woven fabric are known, as described in Japanese Patent Application No. 54-84808, Utility Application No. 54-86058, and the like.

By the way, various performances are required for this type of lining material.

That is, (1) Must have seismic isolation properties.

Large external forces are applied to pipelines due to earthquakes, etc.
When a pipe is damaged, it is necessary for the lining material to peel off from the pipe without breaking itself and to continue to function as a pipe. Hereinafter, this performance will be referred to as seismic isolation. In order to have this seismic isolation property, the strength of the lining material in the longitudinal direction must be sufficiently large and must be strong enough to prevent the lining material from breaking before the adhesive causes shear failure. be.

(2) Must have pressure resistance.

For pipelines that have fluid flowing through them, the lining material will support the pressure of the fluid when the pipeline ruptures due to an earthquake, etc., as mentioned above.
It is necessary to be able to withstand that pressure. Even if this is not the case, the lining material must not be capable of breaking due to fluid pressure when the lining material is turned over, and must have considerable pressure resistance.

(3) Must have external water pressure shape retention properties.

When a hole opens due to corrosion in a pipe, underground water, etc. must not enter through the hole, crushing the lining material due to the water pressure of the groundwater, and making the flow path inside the pipe narrow. . Furthermore, when a pipe is ruptured due to an earthquake or the like, external pressure is directly applied to the lining material, and it is necessary to withstand this pressure. In this way, the lining material can withstand pressure from the outside without being crushed.
The ability to secure a flow path is hereinafter referred to as external water pressure shape retention.

Water resistance and hardness of the adhesive are important for the lining material lining the pipe to have external water pressure shape retention properties, but it is also necessary that this adhesive has sufficient thickness. It is. Therefore, the lining material is required to contain a sufficient amount of adhesive.

(4) Be flexible.

Since the lining material is turned over by fluid pressure, it is necessary that the lining material itself is flexible and does not require high pressure to turn over.

However, the above-mentioned conventional lining materials cannot satisfy these required performances. First of all, the plastic tube itself has little strength,
It cannot have seismic isolation. Moreover, the pressure resistance is insufficient, and there is a possibility of breakage when turning over. Furthermore, since the tube itself does not have the strength to hold the adhesive, it is not possible to form a sufficiently thick layer of adhesive when it is adhered to the inner surface of the pipe, and it does not have external water pressure shape retention.

For lining materials using non-woven fabric, the thickness of the non-woven fabric can be adjusted, and a sufficient thickness can be obtained, and a sufficient amount of adhesive can be retained inside, making it possible to Water pressure shape retention is sufficient. However, since the nonwoven fabric itself has low strength, it does not have seismic isolation properties.

In addition, in the case of lining materials using textiles, the strength of textiles is extremely high because they are made by arranging fiber threads vertically and horizontally, and even stronger lining materials can be obtained by changing the weaving structure. , the seismic isolation is sufficient, and the withstand pressure can also be made large. However, it is difficult to increase the thickness of the fabric.

It is not difficult to obtain thick fabrics for general clothing by modifying the weaving structure. However, although the cylindrical woven fabric of the lining material is woven into a cylindrical shape using a circular loom, the circular loom cannot weave a fabric with a complex structure. Moreover, as mentioned above, it must be woven thickly while having great strength, and unlike thick fabrics for clothing, the thickness cannot be increased with core threads or back threads.

It is possible to increase the thickness by using thicker threads, but if too thick threads are used, the stiffness of the threads will make it difficult to turn the fabric inside out, and the surface of the fabric will become extremely uneven, which will cause problems in the tube after lining. They appear on the inner surface of the fabric, causing increased resistance to water flow, and the texture becomes rough, making it impossible for the adhesive to be retained between the textures. Therefore, it is not possible to hold a sufficient amount of adhesive, and it is not possible to obtain a product with high external water pressure shape retention.

The present invention has been developed in consideration of the above circumstances, and is flexible and has various performances such as seismic isolation, pressure resistance, and external water pressure shape retention, which are necessary as a pipe lining material. The purpose is to provide an excellent lining material.

Accordingly, the present invention provides an airtight seal made of rubber or synthetic resin on the outer surface of the cylindrical woven fabric, which is formed by joining together a double-layered cylindrical fabric in which warp yarns and weft yarns are woven into a cylindrical shape. It is formed by forming a coating layer of.

Embodiments of the present invention will be described below with reference to the drawings.
The drawing shows one embodiment of the present invention, and the lining material 1 includes a coating layer 3 of rubber or synthetic resin formed on the outer surface of a cylindrical woven fabric 2. is woven with warp 6 and weft 7,
It is made up of two inner and outer cylindrical fabrics 4 and 5, and the inner layer cylindrical fabric 4 and the outer layer cylindrical fabric 5 are connected to each other with a binding thread 8.

Furthermore, the structure of the lining material will be explained based on a specific example. As a specific example, we will discuss the lining material applied to a 150mm pipe.

Warp yarns 6 of the tubular woven fabrics 4 and 5 in the tubular woven fabric 2
For this, two 1000 denier polyester filament yarns are twisted together, and 297 yarns are used in each of the inner and outer layers. In the weft thread 7,
One 1000d polyester filament thread and 20
104 yarns are woven into each 10cm space by twisting four high-count polyester spun yarns together. As the binding yarn 8, a yarn made by twisting two 1000D polyester filament yarns is used as a binding warp yarn.
Use 75 bottles. Using a common plain loom, the inner and outer layers of the cylindrical fabrics 4 and 5 were woven in a plain weave structure.

Then, on the outer surface of this cylindrical woven fabric 2, an airtight covering layer 9 made of polyester elastic material was formed by extrusion molding.

For comparison, the structure of a conventional cylindrical woven fabric used as a lining material for a 150 mm pipe is shown.
We used 444 yarns made by twisting three polyester filament yarns of 62 strands are woven into each 10cm space.

Comparing the structures of the tubular woven fabric of the above embodiment and the conventional tubular woven fabric, the total amount of warp yarns in the conventional example is 1332000d, while in the embodiment is 1338000d, and there is almost no difference. Regarding the weft, if we calculate that one 20-count polyester spun yarn is equivalent to 250 d, in the conventional example, the amount of weft per 1 cm is equivalent to 15,500 d, but in the example, it is equivalent to approximately 20,000 d. This is an increase of about 30% compared to the conventional example. And the total amount of yarn is
The weight of the example is about 10% larger than that of the conventional example.

However, when comparing the thickness, the thickness of the conventional example was about 1.2 mm, while the thickness of the example was about 1.7 mm, which is more than 40% thicker. Therefore, the yarn is thicker than the above-mentioned increase in yarn amount. In addition, in the conventional example, thick threads equivalent to 3000 d were used for the warp yarns, resulting in a stiff and rough surface of the woven fabric, but the fabric of this example is more flexible than the conventional example. The surface was also relatively smooth.

Also, when applying adhesive to the inner surface of the lining material,
Adhesive is injected into the lining material 1 and applied by squeezing it with a roller. At this time, the air inside the cylindrical woven fabric 2
Since the adhesive comes out from between the inner layer cylindrical fabric 4 and the outer layer cylindrical fabric 5, the adhesive easily impregnates the inside of the cylindrical fabric 2, and no air bubbles remain in the adhesive. Therefore, in the conventional example, when applying adhesive to the inner surface of the lining material, the amount of adhesive applied per ¹ m2
The amount was 1.4-1.5Kg, but in the example, the amount was much larger, 2.3-2.4Kg, and 60%
It was also possible to impregnate a large amount of adhesive.

Since the lining material 1 of the present invention includes the cylindrical woven fabric 2, it has sufficient strength in the longitudinal direction and exhibits seismic isolation. In the present invention, the tubular woven fabric 2 is
It consists of two layers of cylindrical fabrics 4 and 5, the inner and outer layers, and since the cylindrical fabrics 4 and 5 are connected to each other, the cylindrical fabric 2 behaves as a whole and has sufficient strength. It shows itself.

Moreover, since the cylindrical woven fabric 2 itself can have sufficient pressure resistance, the lining material 1 will not be ruptured by the internal pressure of the fluid even after the pipe line is ruptured.

Furthermore, since multiple layers of adhesive can be impregnated as described above, when the lining material is lined with the pipe, a sufficiently thick adhesive layer is formed, and a rigid pipe is formed by the adhesive layer. However, if a hole opens in the pipe and underground water etc. intrudes, the lining material 1
The flow path is not narrowed due to crushing, and has the above-mentioned external water pressure shape retention property. In order to have sufficient external water pressure shape retention, the thickness of the cylindrical woven fabric 2 must be 2 mm.
The above is preferable.

In addition, in the lining material 1 of the present invention, since the cylindrical woven fabric 2 is composed of two layers of cylindrical fabric 4 and 5, the inner and outer layers, it is more flexible than a single layer cylindrical woven fabric of the same thickness.
When turning over with fluid pressure, it is possible to turn over with less pressure, and the work of lining the pipe can be performed safely.

Therefore, the lining material of the present invention is an excellent lining material that can satisfy many of the above-mentioned conditions.

By the way, the structure of the lining material 1 of the present invention is not limited to the structure of the above embodiment. In the above embodiment, the tubular woven fabric 2 is made by continuously weaving the inner and outer tubular fabrics 4 and 5 with a single weft thread 7, but the inner and outer tubular fabrics 4 and 5 are woven together using a two-chop shuttle. It is also possible to have a structure in which the outer layer cylindrical fabric 5 is made into a separate fabric and these are connected. Further, in the examples, a structure woven with a normal plain loom is shown, but it may be woven with a circular loom.

In addition, in the embodiment, the structure of the binding between the inner layer cylindrical fabric 4 and the outer layer cylindrical fabric 5 is a center warp bonded double weave structure using the bonded warp yarns 8. It may be a center weft bound double weave using weft yarns, and a normal bound double weave structure in which the warp or weft of one of the inner or outer layers is crossed and bound to the other weft or warp. It is also possible to do this.

Further, the structure of the inner and outer cylindrical fabrics 4 and 5 is not limited to the plain weave as in the embodiment, but it is also possible to adopt a twill weave or other weave structure. In addition, in the embodiment, the warp and weft used for the inner layer cylindrical fabric 4 and the outer layer cylindrical fabric 5 are woven using the same yarn and the same composition for both the inner and outer layers, but they are woven using different textures. It is also possible to do this.

For example, by using thin threads for the outer layer of the tubular fabric 5 and using thick threads for the inner layer of the tubular fabric 4, the inner layer of the tubular fabric 2 can be made thicker. In addition to ensuring strength, when the lining material 1 is attached to the inner surface of the pipe, the inner surface can be made smooth to reduce water flow resistance. In addition, a strong filament yarn is used for the inner layer of the tubular fabric 4 to ensure the strength of the tubular fabric 2, and a spun yarn or bulky yarn with a lot of fuzz is used for the outer layer of the tubular fabric 5. By doing so, it is also possible to improve the adhesion between the cylindrical woven fabric 2 and the covering layer 3.

Although polyester elastic material is used as the material for the covering layer 3 of the lining material in the embodiment, the material is not limited to this, and general flexible rubber or synthetic resin can be used. Of course, it goes without saying that it must not be altered by the fluid flowing inside the lined pipe or have any adverse effects on the fluid.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of the lining material of the present invention. 1... Lining material, 2... Tubular woven fabric, 3... Covering layer, 4... Inner layer tubular fabric, 5... Outer layer tubular fabric, 6... Warp, 7... Weft, 8... ...Binding thread.

Claims (1)

[Claims] 1 In the lining material used in the method of inserting a cylindrical lining material into a pipe while turning it inside out using fluid pressure and bonding the lining material to the inner surface of the pipe, a double inner and outer lining made of warp and weft yarns woven into a cylindrical shape is used. A lining material for a conduit, characterized in that an airtight coating layer of rubber or synthetic resin is formed on the outer surface of a cylindrical woven fabric formed by joining together cylindrical woven fabrics.