JPH01164885A - Duct - Google Patents

Abstract

PURPOSE: To obtain a pipeline having seismic isolation property and shape keeping property against outer pressure by forming a lining layer in the inner surface of the pipeline comprising a plurality of stiff short pipes connected to each other. CONSTITUTION: A lining layer 3 is formed in the inner surface of a pipeline 2 which is composed of a plurality of stiff and short pipes 4. The lining layer 3 is spirally arranged under the roughly extended condition to cover 1/3 of the inner surface area of the pipeline 2, and it is composed of a high rigid thread 5 having 2 mm in diameter, a cylindrical cloth 6 woven by warp 7 and woof 8, and an air-tight layer 9 made of rubber or synthetic resins. The high rigid thread 5 and the cylindrical cloth 6 are buried in fine gaps of the fibers, are dipped and hardened with the reactive hardening resin 10. Under this condition, the lining layer 3 is tightly adhered to the pipeline 2.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to pipes mainly buried underground, such as gas pipes, water pipes, sewer pipes, power lines, communication lines, etc. The present invention relates to a pipe structure in which a lining layer is formed inside these pipe systems and has seismic isolation properties and external pressure shape retention properties when the pipe systems are damaged.

Conventional technology In general, the above-mentioned pipes are made by joining together a large number of short pipes to form a long pipe system, but in recent years water pipes and sewer pipes have been damaged due to ground subsidence and vibrations from passing vehicles. If an accident occurs in which pipes or other conduits break, and if major earthquakes are expected to occur in some metropolitan areas, precautionary measures should be taken to line the pipes in case they break due to earthquakes or vibrations. This is what is being done. Such lined pipes are required to have so-called seismic isolation.

In other words, a so-called pipe-in-pipe f14g 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 and to secure a flow path for the time being.

Therefore, as a measure to meet these demands, the
A conduit having a structure described in Japanese Patent No. 2074 is known. This product has a longitudinal tensile strength of 100 kg or more per 1 cm width and an elongation at break of 1 on the inner surface of the pipe system.
The lining material has a tensile strength of 0% or more and a tensile strength that can withstand the maximum pressure of the fluid in the pipe in the circumferential direction.
It is bonded so that it can be peeled off with a shearing force of ~6 kgM.

When the pipe system is destroyed due to an earthquake or vibration, the lining material locally peels off from the pipe system and stretches, absorbing energy, and the lining material itself does not break, allowing the flow path to continue. It has seismic isolation properties.

Problems to be Solved by the Invention However, although such a structure has seismic isolation as described above, the external pressure shape retention is not necessarily sufficient.

In other words, when a pipe system is destroyed due to an earthquake, etc., the external groundwater pressure and earth pressure will directly act on the inner lining layer, so the pipe system must be strong enough to withstand the groundwater pressure and external pressure such as soil pressure. It is necessary to have so-called external pressure shape retention. Particularly in sewer pipes, power lines, communication lines, and other conduits, internal pressure does not act within the pipes, so if the pipe system breaks, external pressures such as groundwater pressure and earth pressure may act directly on the lining material. Therefore, it is especially essential to have this external pressure shape retention property.

This external pressure shape retention 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 pipe,
It is thought 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 bending elastic modulus, the better the external pressure shape retention property becomes.

However, the material described in the above-mentioned publication has a thin lining layer and cannot have sufficient shape retention under external pressure.

The present invention was made in view of the above circumstances, and an object thereof is to provide a conduit having seismic isolation properties and external pressure shape retention properties.

Means for Solving the Problems According to a first invention, a lining layer is formed on the inner surface of a pipe system in which a large number of short rigid pipes are connected, and the lining layer is formed on the inner surface of the pipe system. Thickness 2n, arranged spirally in an almost stretched state so as to cover more than 1/3 of the area.
+ m or more high-rigidity yarn, a cylindrical woven fabric in which warp yarns and weft yarns are woven into a cylindrical shape arranged on the inner surface of the high-rigidity yarn, and a rubber or The highly rigid yarn and the tubular woven fabric are composed of an airtight layer made of synthetic resin,
The second invention is characterized in that these fibers are integrally impregnated and cured with a reaction-curing resin so as to fill the gaps, and in that state, the lining layer is in close contact with the pipe system. , a lining layer is formed on the inner surface of a pipe system connecting a large number of rigid short pipes, the lining layer is a nonwoven fabric with a thickness of 3n+m or more disposed on the inner surface of the pipe system,
On the inner surface of the non-woven fabric, a wire with a thickness of 2++ is arranged in a spiral shape in an extended state S' so as to cover 1/3 or more of the area of the non-woven fabric.
+ m or more high-rigidity yarn, and a cylindrical weave 1j in which warp yarns and weft yarns are woven into a cylindrical shape, which is arranged on the inner surface of the high-rigidity yarn,
An airtight layer made of rubber or synthetic resin is formed on the inner surface of the cylindrical woven fabric, and the nonwoven fabric, the highly rigid yarn, and the cylindrical woven fabric fill the gaps between these fibers. The pipe system is characterized by being integrally impregnated and cured with a reaction-curing resin, and the lining layer is in close contact with the pipe system in that state. A lining layer is formed on the inner surface of the pipe system connected to the
The lining layer is an outer layer cylindrical woven fabric formed by weaving warp and weft yarns into a cylindrical shape, a nonwoven fabric having a thickness of 31111 nm or more disposed on the inner surface of the outer layer cylindrical woven fabric, and an inner surface of the nonwoven fabric,
A high-rigidity yarn with a thickness of 21IIIn or more, which is arranged in a spiral shape in an almost stretched state so as to cover 1/3 or more of the area, and warp and weft yarns arranged on the inner surface of the high-rigidity yarn. consisting of a cylindrical woven fabric woven into a cylindrical shape, and an airtight layer made of rubber or synthetic resin formed on the inner surface of the cylindrical woven fabric,
The outer layer cylindrical woven fabric, nonwoven fabric, high-rigidity yarn, and cylindrical woven fabric are impregnated and cured with a reaction-curing resin so as to fill the gaps between these fibers, and in this state, the lining layer is It is characterized in that it is in close contact with the pipe system.

The present invention will be explained below with reference to the drawings. The drawing shows a conduit 1 according to the invention, in which a lining layer 3 is glued to the inner surface of the conduit 2. The pipe system 2 is formed by connecting a large number of short pipes 4. In the drawings, these short pipes 4 are connected by tightening the end flanges with bolts, but the structure is not limited to this, and they may be connected by other connection methods.

FIG. 1 shows a pipe line 1 according to the first invention, in which the lining layer 3 is made up of three layers, the outermost layer of which is in contact with the inner surface of the pipe system 2 and has a high-rigidity thread 5 arranged in a spiral shape. It is set up. As the high-rigidity yarn 5, it is preferable to use, for example, a multifilament yarn with a glass fiber diameter of 2+nn+ or more, which is arranged so as to cover 1/3 or more of the inner surface of the tube system 2 in a stretched state. has been done.

A cylindrical woven fabric 6 is disposed inside the high-rigidity thread 5. The tubular woven fabric 6 is made by weaving warp threads 7 and weft threads 8 into a tubular shape. As the warp yarn 7, polyester fiber yarn is suitable, and it is desirable that the tensile strength in the warp direction is at least Look ( ) per ICP width, and the elongation at break is at least 10%.Also, as the weft yarn 8, It is desirable to use high-stiffness threads.

Furthermore, an airtight layer 9 made of rubber or synthetic resin is formed on the inner surface of the cylindrical woven fabric 6. A suitable material for the airtight layer 9 is polyester elastic material.

The high-rigidity thread 5 and the tubular woven fabric 6 are impregnated with a reaction-curing resin 10 so as to fill the gaps between these fibers, and by curing the reaction-curing resin 10, an integrated structure is formed. A lining layer 3 is formed, and the lining layer 3 is adhered to the inner surface of the pipe system 2 to form an integral pipe line 1.

FIG. 2 shows the conduit 1 of the second invention. In this conduit 1, the lining layer 3 consists of four layers,
A non-woven fabric 1 is applied to the inner surface of the tubing system 2 as the outermost layer of its lining layer 3.
1 is arranged. A suitable material for the nonwoven fabric 11 is a highly rigid thread such as polyester fiber or glass fiber, and has a thickness of 31P or more.

On the inner surface of this non-woven fabric 11, high-rigidity threads 5 are arranged in a spiral manner, similar to the first invention, and inside the layer of high-rigidity threads 5, a cylindrical woven fabric 6 is arranged. Further, an airtight layer 9 made of rubber or synthetic resin is formed on the inside thereof.

The nonwoven fabric 11, the high-rigidity yarn 5, and the tubular woven fabric 6 are coated with a reaction-curable resin 1 so as to fill the gaps between these fibers.
By curing the reaction-curable resin 10, the lining layer 3 is adhered to the inner surface of the pipe system 2, forming an integral pipe line 1.

Next, FIG. 3 shows the conduit 1 of the third invention.

In this conduit 1, the lining layer 3 is composed of five layers, and an outer layer cylindrical woven fabric 12 is disposed on the inner surface of the pipe system 2 as the outermost layer of the lining layer 3.

This outer layer tubular woven fabric 12 is made by weaving warp yarns 13 and weft yarns 14 into a tube shape, and the warp yarns 13 are polyester fiber yarns, and the weft yarns 14 are high-rigidity yarns such as glass fibers. is appropriate.

Then, on the inner surface of this outer layer cylindrical woven fabric 12, a nonwoven fabric 11 is disposed, as in the second invention above, and the nonwoven fabric 1
A high-rigidity yarn 5 is spirally arranged inside the layer 1, a cylindrical woven fabric 6 is arranged inside the layer of the high-rigidity yarn 5, and an airtight layer 9 is further formed inside the layer. There is.

The outer layer cylindrical woven fabric 12, the nonwoven fabric 11, and the high rigidity yarn 5
The cylindrical woven fabric 6 is impregnated with a reaction-curing resin 10 so as to fill the gaps between these fibers, and by curing the reaction-curing resin 10, the lining layer 3 is formed on the inner surface of the pipe system 2. They are bonded together to form an integral conduit 1.

Specific examples of the high-rigidity yarn in the present invention include glass fiber, aromatic polyamide fiber, wholly aromatic polyester fiber,
Carbon fibers, metal fibers, ultra-high polymerization degree polyethylene fibers, etc. can be mentioned. When forming the lining layer, these highly rigid yarns are impregnated with a reaction-curing resin. Epoxy resins and unsaturated polyester resins are commonly used as the reaction-curing resin. Therefore, it has excellent affinity with these resins,
Glass fiber is particularly suitable because it can form a composite material with a high elastic modulus using these resins as a matrix.

Therefore, in the pipe line 1 of the present invention, fiber layers 5, 6, 1 are formed inside the pipe system 2 using a reaction-curable resin 10 as a matrix.
1.12 A pipe made of solid FRP is formed, and a so-called pipe-in-pipe structure is formed.

Therefore, when the outermost pipe system 2 is destroyed due to an earthquake or the like, the lining layer 3 of the FRP structure consisting of the fiber layers 5, 6, 11, 12 and the reaction hardening resin 10 is replaced by the cylindrical woven fabric 6. The tube system 2 and the lining layer 3 can be separated from each other without breaking the lining layer 3, since the lining layer 3 is reinforced in the length direction by the outer cylindrical woven fabric 12 in the third invention. The lining layer 3 expands to secure an internal flow path.

-16= It has sufficient seismic isolation. At this time, by using the above-mentioned polyester fiber yarn as the warp yarn 7 of the tubular woven fabric 6, it can exhibit sufficient strength and appropriate extensibility, and can have excellent seismic isolation.

Furthermore, when earth pressure is applied from the outside to the lining layer 3 in the part where the pipe system 2 is destroyed, the earth pressure mainly acts in the vertical direction, so the lining layer 3 tends to deform into a slightly flattened shape. At this time, in the present invention, high rigidity yarn 5 is provided in the lining layer 3.
As a result, the bending elastic modulus of the lining layer 3 in the circumferential direction is large, and the lining layer 3 is not deformed by the bending.

Further, as described above, when the lining layer 3 tries to deform into a flat shape, a force is applied to the upper and lower portions in a direction that causes the inner surface portions to expand. However, especially in the second and third inventions, the thickness of the lining layer 3 is large due to the nonwoven fabric 11 and the outer tubular woven fabric 12, and the high-rigidity yarn 5 is disposed close to the inner surface of the lining layer 3. Furthermore, the high-rigidity yarn 5 extends in the circumferential direction without being stretched. Therefore, the inner surface of the lining layer 3 does not stretch, preventing deformation and exhibiting extremely high external pressure shape retention.

Furthermore, by using glass fibers for the weft threads 8 of the tubular woven fabric 6, this effect becomes even stronger.

Further, during the above-mentioned deformation, stress acts on the side portions of the lining layer 3 in a direction in which the outer surface portions are bent, although the stress is smaller than the stress on the inner surfaces at the upper and lower portions.

In the third invention, the outermost layer of the cylindrical woven fabric 12 of the lining layer 3 can prevent the tension. In this sense as well, it is preferable to use high-rigidity threads for the weft threads 14 of the outer layer tubular woven fabric 12.

Effects of the Invention Therefore, according to the present invention, even if the pipe system 2 is damaged due to an earthquake or the like, the lining layer 3 can be peeled off from the pipe system 2 without being broken, and the internal flow path can be secured to allow fluid to leak out. It has the seismic isolation required for a conduit.

Furthermore, even if the pipe system 2 breaks underground and the lining layer 3 is exposed, the lining layer 3 will not be crushed by external pressure such as earth pressure, will continue to secure a flow path, and will retain its shape under external pressure. This will satisfy the following.

The structure of the first invention is sufficient for relatively small-diameter pipes, but as the diameter increases, the resistance to external pressure decreases, and in order to provide shape retention against external pressure, the lining layer 3 must be It is better to apply the second invention, which allows the thickness to be increased, and for larger diameters, it is better to apply the third invention.

[Brief explanation of the drawing]

The drawings are partially enlarged cross-sectional views showing the lining material of the present invention, with FIG. 1 showing the first invention, FIG. 2 the second invention, and the third invention.
The figure shows the lining material of the third invention.

Claims (1)

[Claims] 1. A pipe system (2) formed by connecting a large number of rigid short pipes (4).
A lining layer (3) is formed on the inner surface of the pipe system (2), and the lining layer (3) is substantially extended to cover 1/3 or more of the area of the inner surface of the pipe system (2). A high-rigidity thread (5) with a thickness of 2 mm or more arranged in a spiral, and warp threads (7) and weft threads (8) arranged on the inner surface of the high-rigidity thread (5) are formed into a cylindrical shape. It consists of a woven cylindrical woven fabric (6) and an airtight layer (9) made of rubber or synthetic resin formed on the inner surface of the cylindrical woven fabric (6). The cylindrical woven fabric (6) is integrally impregnated and cured with a reaction-curing resin (10) so as to fill the gaps between these fibers, and in this state, the lining layer (3) is attached to the tube system (2). The pipe line 2 is characterized in that the warp threads (7) of the tubular woven fabric (6) are polyester fiber threads, and the tensile strength in the warp direction is 100 kg or more per 1 cm width, Pipeline 3 according to claim 1, characterized in that the elongation at break is 10% or more, characterized in that the weft (8) of the tubular woven fabric (6) is a high-rigidity yarn. The pipe line 4 according to claim 1, wherein the high-rigidity thread is a glass fiber filament thread. Pipe system (2) made by connecting rigid short pipes (4)
A lining layer (3) is formed on the inner surface of the pipe system (2), and the lining layer (3) comprises a nonwoven fabric (11) with a thickness of 3 mm or more disposed on the inner surface of the pipe system (2), and the nonwoven fabric ( A high-rigidity thread (5) with a thickness of 2 mm or more, which is spirally arranged on the inner surface of the inner surface of the high-rigidity thread (5) in a substantially stretched state so as to cover 1/3 or more of its area; ) and a cylindrical woven fabric (6) in which warp (7) and weft (8) are woven into a cylindrical shape, and a rubber formed on the inner surface of the cylindrical woven fabric (6). or an airtight layer (9) made of synthetic resin, the non-woven fabric (11), the highly rigid yarn (5) and the tubular woven fabric (6).
are integrally impregnated and cured with a reaction curing resin (10) so as to fill the gaps between these fibers, and in this state, the lining layer (3) is in close contact with the pipe system (2). A conduit 6 according to claim 5, wherein the nonwoven fabric (11) is made of polyester fiber. A conduit 7 according to claim 5, characterized in that the nonwoven fabric (11) is made of high rigidity fiber. The pipe line 8 according to claim 5, wherein the high-rigidity fiber is glass fiber. The pipe line 9 according to claim 7, wherein the high-rigidity fiber is glass fiber. The tubular woven fabric (6) The warp (7) is a polyester fiber yarn, the tensile strength in the warp direction is 100 kg or more per 1 cm width, and the elongation at break is 10% or more. Pipe line 10 according to claim 5. Pipe line 11 according to claim 5, characterized in that the weft (8) of the tubular woven fabric (6) is a high-rigidity yarn. The high-rigidity yarn is made of glass. Pipe line 12 according to claim 5 or 10, characterized in that it is a fiber filament yarn. A lining layer ( 3), wherein the lining layer (3) comprises an outer layer cylindrical woven fabric (12) formed by weaving warp yarns (13) and weft yarns (14) into a cylindrical shape, and the outer layer cylindrical woven fabric. A nonwoven fabric (11) with a thickness of 3 mm or more is disposed on the inner surface of the fabric (12), and a spiral shape is formed on the inner surface of the nonwoven fabric (11) in a substantially stretched state so as to cover 1/3 or more of the area of the nonwoven fabric (11). A high-rigidity yarn (5) with a thickness of 2 mm or more, which is arranged in It consists of a cylindrical woven fabric (6) and an airtight layer (9) made of rubber or synthetic resin formed on the inner surface of the cylindrical woven fabric (6).
), the nonwoven fabric (11), the highly rigid yarn (5), and the tubular woven fabric (6) are integrally impregnated and cured with a reaction-curing resin (10) so as to fill the gaps between these fibers. The pipe line 13 is characterized in that the lining layer (3) is in close contact with the pipe system (2) when the pipe line 13 is in close contact with the pipe system (2). Pipe line 14 according to claim 12, characterized in that the weft (14) of the outer layer tubular woven fabric (12) is made of high-rigidity yarn.
Pipe line 15 according to claim 2. Pipe line 16 according to claim 12, characterized in that the nonwoven fabric (11) is made of polyester fiber. A conduit 17 according to claim 12, characterized in that the high-rigidity fiber is glass fiber. A conduit 18 according to claim 16, characterized in that the cylindrical woven fabric (6 ), the warp (7) is a polyester fiber yarn, the tensile strength in the warp direction is 100 kg or more per 1 cm width, and the elongation at break is 10% or more. Pipeline 19 according to claim 12 Pipeline 20 according to claim 12, characterized in that the weft (8) of the tubular woven fabric (6) is a high-rigidity yarn The high-rigidity yarn is The conduit according to claim 12, 14 or 19, characterized in that it is a glass fiber filament yarn.