JP2005194807A - Drain material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain material which combines sufficient strength against earth pressure with the excellent function of discharging redundant water etc., and a drain material which can easily recover the discharge function decreased due to clogging after being installed in ground. <P>SOLUTION: This drain material 1 comprises: a composite pipelike body 3 equipped with a plurality of pipelike bodies 2 which have shape retention and wherein many through-holes 2a are formed in a pipe wall; and a tubular fabric 4 for covering an outer surface of the pipelike body 3. Thus, the drain material combines the sufficient strength against the earth pressure with the excellent function of discharging the redundant water etc. in soil, and can easily recover the discharge function decreased due to the clogging, for example, by injecting high-pressure water into some of the pipelike bodies 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drain material for discharging surplus water and the like from the ground and a method for producing the same.

  Conventionally, in order to discharge underground surplus water and stabilize the ground, a drain material having a large number of water holes and buried in the ground has been widely used. This drain material is required to have both sufficient strength to withstand earth pressure and good drainage. As such a drain material, for example, a perforated pipe having a large number of water passage holes formed on the pipe wall and a gap that covers the outside of the perforated pipe and has water permeability, elasticity, and strength against earth pressure. The thing provided with the material is proposed (for example, refer patent document 1).

  A drain material having a filtration layer formed by heat-sealing a web made of heat-adhesive conjugate fibers has also been proposed (see, for example, Patent Document 2). The fineness of the heat-adhesive conjugate fiber of the filtration layer is a fineness (10 to 100 dtex) that can ensure sufficient strength against earth pressure and good water permeability.

JP 2000-336636 A JP 2002-332630 A

  However, since the conventional drain materials such as Patent Documents 1 and 2 are mainly composed of one tubular body, there is a limit to increasing the strength against earth pressure. In particular, when a large earth pressure acts on the drain material, such as when the drain material is buried deep in the ground, the drain material may be crushed by the earth pressure, and the assumed drainage function may not be exhibited. There is.

  Further, in the conventional drain material, after the drain material is installed in the ground, with time, the drainage function of the drain material is reduced due to clogging of the drain holes of the drain material due to fine particles of the soil. In such a case, with the conventional drain material, it is necessary to dig up the ground again and replace the clogged drain material with a new one, or to newly bury the drain material in another position, and to perform the drainage function. The cost for the work for recovery will increase.

  The object of the present invention is to provide a drain material that has sufficient strength against earth pressure and an excellent discharge function such as excess water, and easily recovers the discharge function that has been lowered due to clogging after installation in the ground It is to provide a drain material that can be used.

Means for Solving the Problems and Effects of the Invention

  A drain material according to a first aspect of the present invention is a composite tubular body including a plurality of tubular bodies having a plurality of through-holes formed in a tube wall and having shape retention, and a tubular fabric covering an outer surface of the composite tubular body. It is characterized by having.

  In the state where this drain material is disposed in the ground, surplus water, gas, etc. in the soil flows into the tubular body through the numerous through holes of the tubular body from the portion of the soil where the surface tubular fabric contacts, It is discharged to the outside through the body. Here, each of the plurality of tubular bodies has a shape-retaining property, the plurality of tubular bodies are covered with a tubular woven fabric, the plurality of tubular bodies are bundled, and the composite tubular bodies are integrated. Therefore, the drain material of the present invention has higher strength against the earth pressure than the case where the drain material having the same diameter is mainly composed of one pipe, and is crushed by the earth pressure. It is hard to be done. In addition, the drain material can be easily handled during storage and transportation.

  In addition, since the outer surface of the composite tubular body is covered with a tubular woven fabric, the surface filtration layer that filters excess soil water is composed of a homogeneous woven fabric, such as sandy soil or viscous soil, Since the mesh of the tubular woven fabric can be freely changed according to the particle size of the solid particles of the soil in which the filter is installed, the degree of freedom in designing the filtration layer is great.

  In addition, since the drain material includes a plurality of tubular bodies having a large number of through-holes, even if the through-holes or the inside of one tubular body is clogged, excess water or the like from the through-holes to other tubular bodies. Can be discharged and discharged to the outside. Furthermore, by pouring high-pressure water or the like into another unclogged tubular body, the surface of the tubular body and the cake layer formed on the inside are destroyed, and further slime and soil particles are discharged to the outside of the tubular body. Therefore, the discharge function can be easily recovered.

  Further, by extracting one of the tubular body or the plurality of tubular bodies from the state in which the filler is injected into the tubular body and the plurality of tubular bodies are in close contact with the soil, Since the diameter of the material is reduced, the drain material whose function of discharging excess water or the like is reduced due to clogging can be easily extracted from the ground, and the drain material can be easily replaced.

  The drain material according to a second aspect is characterized in that, in the first aspect, the tubular woven fabric is a woven fabric composed of a plurality of warps and wefts continuously woven in a spiral shape with respect to the warps. It is what. Therefore, there is no portion where the tensile strength is locally weak in the tubular woven fabric covering the composite tubular body, and even when a large earth pressure acts on the drain material, the drain material is difficult to break.

  The drain material according to a third aspect is the composite tube according to the first or second aspect, wherein the tubular woven fabric is in close contact with each of the outermost tubular bodies among the plurality of tubular bodies. The outer surface of the body is covered. Therefore, since the composite tubular body is covered with the tubular woven fabric and the plurality of tubular bodies having shape retaining properties are tightly bundled, the strength of the drain material against the earth pressure becomes higher. Moreover, since the plurality of tubular bodies and the tubular woven fabric are integrated, the drain material can be installed in the ground by inserting the drain material into a hole formed in advance, and there is no need to dig up the ground surface. The installation work of drain materials becomes relatively easy. Furthermore, even when the tubular body is of a fixed length and a plurality of tubular bodies are connected in the longitudinal direction, the connecting portion is firmly tightened by the tubular fabric, so that an external force is applied to the connecting portion. Even if it works, the connection is difficult to be released.

  The drain material of the fourth invention is characterized in that, in any one of the first to third inventions, the weave of the tubular woven fabric is smaller than the through hole of the tubular body. Since the excess water in the soil is filtered by the tubular woven fabric having a small weave located on the outside, the excess water after the filtration flows into the inner tubular body having a coarse mesh without resistance. The drain material of the present invention is particularly suitable for sandy soil, in which case the particle size is relatively large even if a sand accumulation layer is formed on the surface of the tubular fabric, Since there are many gaps in the deposited layer, surplus water in the soil flows into the drain material through the gap in the deposited layer, and the drain material is not clogged.

  The drain material according to a fifth invention is characterized in that, in any one of the first to third inventions, a texture of the tubular fabric is larger than a through hole of the tubular body. The drain material of the present invention is particularly suitable when the soil soil is silt or cohesive soil. In such soil, since the particle size is very small, when such particles accumulate on the surface of the tubular fabric to form a dense cake layer, excess water in the soil is difficult to flow into the tubular body. Become. However, in the drain material of the present invention, the texture of the outer tubular fabric is larger than the through hole of the inner tubular body, so that the solid particles having a small particle size together with the excess water etc. Since the solid particles having a small particle diameter are transported between the woven fabric and inside the tubular body, and the excess water or the like flows, the drain material is not easily clogged.

  The drain material according to a sixth invention is the first tubular body according to any one of the first to third inventions, wherein the composite tubular body has a plurality of first through holes formed in a tube wall and has shape retention. And a plurality of second tubular bodies that are arranged along the outer periphery of the first tubular body, have a plurality of second through holes larger than the first through holes in the tube wall, and have shape retention. The texture of the tubular woven fabric is larger than that of the second through hole.

  That is, in this drain material, the second through hole of the second tubular body on the outer side is larger than the first through hole of the first tubular body located on the innermost side, and the cylindrical shape located on the outer side thereof. The texture of the fabric is larger. Therefore, surplus water or the like that has flowed into the drain material together with the soil particles passes through the coarse woven fabric and the tube wall of the second tubular body and is discharged to the outside through the plurality of second tubular bodies. Here, especially in soils with very small particle sizes, such as silt and cohesive soil, such small particles pass through the coarse tubular woven fabric and the second tubular body, and further to the innermost side. To the first tubular body. Here, when a dense cake layer is formed on the surface of the first tubular body and the layer becomes thicker, the cake layer gradually forms to the second tubular body on the outer side, and finally, In addition, the entire drain material may be clogged. However, in such a state, for example, high pressure and a large amount of water are injected from the inner first tubular body, and the high pressure water is formed on the surfaces of the first tubular body and the second tubular body. Since the cake layer can be broken and soil particles or the like causing clogging can be discharged from the second tubular body, the draining function of the drain material can be easily recovered.

  A drain material according to a seventh invention is characterized in that, in any one of the first to sixth inventions, a nonwoven fabric is interposed between the composite tubular body and the tubular woven fabric. . The nonwoven fabric layer between the composite tubular body and the tubular woven fabric can also capture particles having a very small particle diameter inside thereof and filter excess water and the like. In particular, even when the texture of the outermost cylindrical fabric is fairly rough, small particles are captured by the nonwoven fabric layer, so that such small particles do not reach the surface of the tubular body, and no cake layer is formed on the tubular body. .

  The drain material according to an eighth invention is characterized in that, in any of the first to seventh inventions, the tubular body is made of a flexible material. By constructing the tubular body with a flexible material such as synthetic resin, the drain material can be stored or transported in a state of being wound on a reel or the like with a relatively large radius of curvature, and handling becomes easy. . In addition, the drain material can be easily carried into a narrow construction place such as the inside of a vertical shaft, and the degree of freedom in selecting the construction place is increased.

  The drain material according to a ninth invention is characterized in that, in any one of the first to eighth inventions, the tubular body is a tubular woven fabric made of warp and rigid weft. It is. Therefore, the strength against the earth pressure of the tubular body is further increased. Further, it is possible to roughen the eyes of the tubular woven fabric to prevent clogging of the through-holes while ensuring sufficient strength against earth pressure.

  According to a tenth aspect of the present invention, there is provided a method for producing a drain material, comprising: inserting a composite tubular body having a plurality of through holes formed in a tube wall and having a shape retaining property into an annular loom; Thus, a tubular woven fabric is woven so as to be in close contact with the outer surface of the composite tubular body, and the composite tubular body and the tubular woven fabric are simultaneously fed out from an annular loom. Therefore, a long and a plurality of tubular bodies are integrated, and a drain material having an arbitrary diameter having high strength against earth pressure can be manufactured easily and continuously. In addition, the mesh between the inner tubular body and the surface tubular fabric can be freely designed according to the conditions of the ground where the drain material is used. Furthermore, it is also possible to easily change the tubular body and the type of tubular fabric covering the tubular body (for example, the roughness of the weave, the type of yarn to be constructed, etc.) according to the use conditions.

  The method for producing a drain material according to an eleventh aspect of the invention is characterized in that, in the tenth aspect of the invention, the composite tubular body is inserted into the annular loom while the nonwoven fabric is covered on the outer surface of the composite tubular body. . Therefore, the drain material in which the nonwoven fabric is interposed between the composite tubular body and the tubular woven fabric can be easily manufactured.

  Embodiments of the present invention will be described. This embodiment is an example in which the present invention is applied to a drain material that is installed in the ground and drains excess water in soil.

  As shown in FIGS. 1 and 2, the drain material 1 includes a composite tubular body 3 including seven tubular bodies 2 having a large number of through holes 2 a formed in a tube wall and having shape retention, and the composite tubular body. And a tubular woven fabric 4 that covers the outer surface of the body 3.

  The tubular body 2 is composed of a tube made of synthetic resin. The tube wall of the tubular body 2 is formed in a mesh shape, and a large number of through holes 2a are formed in the mesh-shaped tube wall. Yes. The mesh pitch of the tubular body 2 is a large interval of 15 mm, and the thickness of the mesh is 3 mm. In addition, polyethylene is employ | adopted as a synthetic resin which forms the tubular body 2, and the tubular body 2 has a certain amount of flexibility and shape retention property.

  The other six tubular bodies 2 are arranged along the outer periphery of one of the seven tubular bodies 2 to form a composite tubular body 3. The outer surface of the composite tubular body 3 uses 1000/4 polyester × 10 / cm as the warp and 1000/4 polyester × 20 / cm as the weft. A finely woven tubular woven fabric 4 woven in a plain weave is covered with wefts that are continuously woven into the shape. The weave of the tubular fabric 4 is smaller than the through hole 2 a of the tubular body 2.

  Further, as shown in FIG. 2, the circumferential length of the tubular fabric 4 is such that the outer circumference of the outer six tubular bodies 2 out of the seven tubular bodies 2 constituting the composite tubular body 3 is the shortest distance. The circumferential length is equal to or close to the connecting virtual line 6, and the tubular fabric 4 covers the outer surface of the composite tubular body 3 in a state of being in close contact with each of the outer six tubular bodies 2. Yes. Accordingly, since the seven tubular bodies 2 having shape retention are firmly constrained and integrated by the tubular fabric 4, the drain material having the same diameter is mainly composed of one pipe. In comparison, the strength of the drain material 1 against the earth pressure is very high, and it is difficult to be crushed by the earth pressure. Further, even when the tubular body 2 is of a fixed length and a plurality of tubular bodies 2 are connected in the longitudinal direction, the connection portion is firmly tightened by the tubular fabric 4, so that the connection Even if an external force acts on the part, the connection is difficult to be released. Further, the tubular woven fabric 4 is continuously woven in the circumferential direction by an annular loom 10 described later, and the wefts of the tubular woven fabric 4 are continuous in a spiral shape, and no seam extending in the longitudinal direction is formed. Therefore, the tensile strength of the tubular fabric 4 is very high, and even when a large earth pressure acts on the drain material 1, the tubular fabric 4 is difficult to break.

  This drain material 1 is particularly suitable for draining from the ground made of rock, crushed stone, coarse sand, etc., having a relatively large particle size. That is, since the weave of the tubular fabric 4 is smaller than the through hole 2 a of the tubular body 2, particles such as sand are captured by the dense tubular fabric 4 on the surface of the drain material 1. And since the particle size of particles such as sand is large, even if a deposited layer is formed on the surface of the tubular fabric 4 where the particles are captured, excess water flows into the drain material 1 from the gaps in the deposited layer. The filtered surplus water flows into the tubular body 2 without resistance.

  Since the seven tubular bodies 2 bundled by the tubular fabric 4 have a certain degree of flexibility, the drain material 1 can be stored or transported while being wound around a reel or the like with a relatively large radius of curvature. It is possible and easy to handle. Moreover, it can be easily carried into a narrow construction place such as the inside of a shaft, and the degree of freedom in selecting the construction place is increased.

Next, the manufacturing method of this drain material 1 is demonstrated.
As shown in FIG. 3, a composite tubular body 3 is configured by arranging six tubular bodies 2 around one tubular body 2, and the composite tubular body 3 is inserted into the annular loom 10. At this time, if the seven tubular bodies 2 are previously bundled with the cord 15 or the like, the insertion operation into the annular loom 10 can be easily performed. The seven tubular bodies 2 are arranged so as to be displaced from each other in the length direction so that the strength of the composite tubular body 3 against the earth pressure is uniform.

  Next, the tubular woven fabric 4 is woven on the outer side of the composite tubular body 3 with the gauge ring 13 using the warp yarns 11 and the weft yarns 12 that are supplied radially by the annular loom 10. At this time, the tubular fabric 4 is woven while applying tension to the weft 12 so that the weft 12 firmly bites into the outer surface of each of the outer six tubular bodies 2. Then, the drain material 1 in which the composite tubular body 3 and the tubular fabric 4 are integrated is simultaneously sent out from the annular loom 10 by the feed mechanism 14.

  According to this method for producing a drain material 1, a long and a plurality of tubular bodies 2 are integrated to easily and continuously produce a drain material 1 having an arbitrary diameter with high strength against earth pressure. Can do. In addition, the mesh between the inner tubular body 2 and the surface tubular fabric 4 can be freely designed according to the conditions of the soil in which the drain material 1 is used (fineness of solid particles, amount of soil water, etc.).

  In addition, the manufacturing method of the drain material 1 is not restricted to the above-mentioned method. For example, a tubular woven fabric 4 having a diameter sufficiently larger than the entire diameter of the composite tubular body 3 composed of seven tubular bodies 2 is woven using wefts composed of heat-shrinkable yarn, and the tubular woven fabric 4 is woven into the tubular woven fabric 4. After inserting the composite tubular body 3, the tubular fabric 4 may be adhered to the surface of the composite tubular body 3 by applying heat to the tubular fabric 4 to contract the weft.

  By the way, when this drain material 1 is installed in the ground, after digging up the ground once and laying the drain material 1, the drain material 1 is refilled or the drain material 1 is inserted into a hole previously formed in the ground. Various methods, such as a method, can be adopted. However, since the drain material 1 has a structure in which the composite tubular body 3 is covered and integrated with the tubular woven fabric 4, it is easy to handle, and any method is adopted. Even so, the installation work can be easily performed.

  In addition, when a certain period of time has elapsed since the drain material 1 was installed in the ground, a cake layer of soil particles may be formed on the surface of the inner tubular body 2, or from the dead bodies of microorganisms in the tubular body 2. Even when the slime is generated and the soil particles are entangled with the slime, a plug is formed inside the tubular body 2 and the inside of some of the tubular bodies 2 is clogged, the surplus from the other tubular bodies 2 Can drain water. Moreover, since there are a plurality of tubular bodies 2, it is possible to clean the inside. For example, as shown in FIG. 4, a hose 21 connected to the nozzle or pump of the high-pressure washing machine 20 is inserted from the non-clogged tubular body 2 to the vicinity of the distal end of the tubular body 2, and the tubular body 2 is inserted into the tubular body 2. Inject a large amount of high-pressure water. Then, the injected water destroys the cake layer formed on the surface of the tubular body 2, the cake layer on the surface of the other tubular body 2, and the internal plug, causing clogging of the tubular body 2. Since the foreign material to be discharged is discharged to the outside of the tubular body 2, the lowered drainage function of the drain material 1 can be easily recovered.

  Furthermore, even when such foreign substances cannot be removed even by washing with high-pressure water and the drainage function of the drain material 1 cannot be sufficiently recovered, the old drain material 1 can be pulled out from the ground and replaced with a new drain material 1. Is possible. That is, by pulling out a part of the seven tubular bodies 2 first and reducing the diameter of the drain material 1 as a whole, the other tubular bodies 2 can be easily pulled out from the ground.

  When a part of the tubular body 2 is pulled out first, for example, as shown in FIGS. 5 and 6, a retracted position indicated by a solid line and a protruding position indicated by a chain line provided at the tip of the rod 23 are shown in FIG. The blade 24 that can be moved between the two is switched by the heat generated by the heater 26 connected to the external power source 25, and a long heat cutter 22 that cuts the object is used to make a tubular tube made of synthetic resin. If the body 2 is cut in the longitudinal direction, the tubular body 2 can be pulled out more easily. When a part of the tubular body 2 is pulled out from the hole, the entire diameter of the drain material 1 is reduced accordingly, so that the other tubular body 2 is easily pulled out from the hole. Furthermore, when the shaft or opening etc. are formed in the both sides of the hole in the underground in which the drain material 1 is installed, and the both ends of the hole are open | released, the old tubular body 2 from the one end side of the hole It is also possible to insert a new drain material 1 from the other end side while extracting.

Next, modified embodiments in which various modifications are made to the embodiment will be described. However, components having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.
1] A fiber having a high elongation such as nylon may be used for the warp of the tubular fabric 4 covering the outer surface of the composite tubular body 3, and a fiber having a low elongation such as polyester may be used for the weft. In this case, since the flexibility with respect to the bending of the drain material 1 is increased, handling during transportation and storage such as winding with a reel or the like becomes easier. On the other hand, since the wefts in the circumferential direction do not extend so much, the composite tubular body 3 is bundled by the tubular woven fabric 4 so that an integrated structure is maintained. It becomes easy to adopt the method of inserting and installing in the ground. In such an installation method, it is not necessary to dig up the surface of the earth, so that the work is relatively easy and it is possible to avoid damaging the surrounding landscape as much as possible.

  2] The number of tubular bodies 2 is not limited to seven, but if the number of tubular bodies 2 is too small, the strength against earth pressure may be insufficient, and conversely, the number of tubular bodies 2 is too large. If it is too much, handling of the composite tubular body 3 becomes difficult, for example, it becomes difficult to cover and integrate the plurality of tubular bodies 2 with the tubular fabric 4 when manufacturing the drain material 1. It is preferable to use an appropriate number in consideration of the properties and the like.

  3] The tubular body 2 may be a tubular woven fabric using a weft having rigidity such as a monofilament or a wire as the weft, in addition to the mesh-shaped synthetic resin tube as in the above embodiment. In such a tubular body, the strength against earth pressure is higher than that of a synthetic resin tubular body, and the tubular body is less likely to be crushed. Further, by roughening the texture of the tubular woven fabric, it is possible to increase the size of the through hole of the tubular body to prevent clogging while ensuring sufficient strength against earth pressure.

  4] As shown in FIG. 7, the composite tubular body 3 </ b> A includes a first tubular body 30 having a plurality of first through holes 30 a formed on the tube wall and having shape retention, and an outer periphery of the first tubular body 30. And a plurality of second tubular bodies 31 having a plurality of second through holes 31a larger than the first through holes 30a formed in the tube wall and having shape retention, and further, a second tubular body. The drain material 1 </ b> A may be configured so that the weave of the tubular fabric 4 covering the outer surface of the body 31 is larger than the second through hole 31 a of the second tubular body 31.

  The first and second tubular bodies 30 and 31 may each be composed of a mesh-shaped synthetic resin tube, as in the above-described embodiment, but may be composed of two types of tubular woven fabrics having different textures. You can also For example, the first tubular body 30 with fine inner weave is woven with a plain weave of nylon multifilaments of 1000 d / 4 warps and polyester monofilaments of 4 mm / cm and weft yarns of 4 mm / cm. On the other hand, the second tubular body 31 having a rough outer weave (that is, the second through hole 31a is larger than the first through hole 30a of the first tubular body 30) and the warp yarn from the first tubular body 30 are used. It is also possible to make a cylindrical woven fabric woven with plain weave of 1000d / 4 nylon multifilaments × 5 / cm and wefts of polyester monofilaments of diameter 1 mm × 4 / cm as in the first tubular body 30. . The diameter of the first tubular body 30 is 5 cm, and the diameter of the second tubular body 31 is 3 cm. Further, the outermost tubular woven fabric 4 that covers the surface of the plurality of second tubular bodies 31 on the outer side is coated with 1000/4 polyester × 2 / cm as a warp and 1000/4 polyester × as a weft This is a tubular woven fabric using 2 pieces / cm and having a coarser texture than the first tubular body 30 and the second tubular body 31 (having a larger texture than the second through holes 31a of the second tubular body 31).

  By the way, such a drain material 1A is particularly suitable for drainage from ground with relatively fine particles, such as embankments with a lot of viscous soil and silt, beaches with fine sand particles, or golf-like sand fields. This is because, in conventional drain materials, such fine particles accumulate on the surface of the drain material and form a dense cake layer, so that a certain period of time has passed since it was installed in the ground. However, in the drain material 1A shown in FIG. 8, very fine particles of silt or clay soil are rough and the outermost cylindrical fabric and the plurality of inner layers It passes through the two tubular bodies 31 and deposits on the surface of the first tubular body 30 having a small central weave. Therefore, unlike the conventional drain material, a layer of soil particles is difficult to be formed at the portion in contact with the soil on the outer surface, and the degree of decrease in the drainage function is very small as compared with the conventional drain material. Then, particles having a small particle diameter enter between the tubular bodies 30 and 31 and the tubular fabric 4 or inside the tubular bodies 30 and 31. Since surplus water flows into such a space, solid particles having a small particle diameter are carried by the flow, and the tubular bodies 30 and 31 are less likely to be clogged.

  Incidentally, fine particles are deposited on the surface of the central first tubular body 30, and a cake layer is gradually formed. The layer begins to fill the inside of the outer second tubular body 31, and the drain material 1A When clogged, as shown in FIG. 8, high pressure water is injected into the central first tubular body 30, thereby eliminating clogging inside the tubular bodies 30, 31 and easily draining the water. Can be recovered.

  5] As shown in FIG. 9, the drain material 1 </ b> B may have a structure in which a nonwoven fabric 33 is interposed between the composite tubular body 3 </ b> B and the tubular fabric 4. As an example, the composite tubular body 3B of the drain material 1B is similar to the drain material 1A (see FIG. 7) described above, and the first tubular body 30 made of a tubular woven fabric and a plurality of the same tubular woven fabrics. It has (for example, eight) second tubular bodies 31. The first tubular body 30 is a tubular woven fabric having a small weave woven with a plain weave of nylon multifilaments of 1000d / 4 warps and polyester monofilaments of 4 mm / cm and wefts of 4 mm / cm. On the other hand, the second tubular body 31 is made of 1000d / 4 nylon multifilaments × 5 / cm, whose warps are coarser than those of the first tubular body 30, and the wefts are polyester monofilaments having a diameter of 1 mm as in the first tubular body × 4. This is a tubular fabric woven with a plain weave of / cm. The diameter of the first tubular body 30 is 5 cm, and the diameter of the second tubular body 31 is 3 cm.

The outer surfaces of the plurality of second tubular bodies 31 are covered with a nonwoven fabric 33 having a thickness of 5 mm. The nonwoven fabric 33 is made of polyester, and a fabric having a basis weight of 500 g / m ^{2 and} a relatively high porosity is used. Here, it is more preferable to use a non-woven fabric made of polyester fiber mixed with a low melting point yarn and cured by heat treatment. This is because the thickness of the nonwoven fabric is not impaired by the earth pressure acting on the drain material 1B.

  Further, the outer surface of the nonwoven fabric 33 is covered with the tubular fabric 4. This tubular woven fabric 4 is a tubular woven fabric having a coarse texture using polyester 1000/4 × 2 / cm as the warp and polyester 1000/4 × 2 / cm as the weft. The non-woven fabric 33 is coated so as to bite into.

  The drain material 1B having the nonwoven fabric 33 is particularly suitable for drainage from ground with relatively fine particles. That is, the outermost cylindrical fabric 4 has a coarse texture, and the nonwoven fabric 33 having a high porosity is formed inside the tubular fabric 4, so that fine particles of soil have passed through the tubular fabric 4. After that, it is caught by the fibers in the nonwoven fabric 33 and captured. Accordingly, fine particles do not reach the surfaces of the first and second tubular bodies 30 and 31, and a cake layer is hardly formed on the tubular bodies 30 and 31, so that the tubular bodies 30 and 31 are not easily clogged. Since the fibers in the nonwoven fabric 33 are three-dimensionally entangled, a continuous cake layer is not formed by the particles caught on the fibers in the nonwoven fabric 33, and the flow of water is not hindered.

  In addition, when manufacturing the drain material 1B which has such a nonwoven fabric 33, for example, while winding the 1st tubular body 30 and the several 2nd tubular body 31 with the nonwoven fabric 33, it is to the cyclic | annular loom 10 (refer FIG. 3). What is necessary is just to insert and weave the tubular fabric 4 on the surface of the nonwoven fabric 33. Alternatively, when inserting the composite tubular body 3B into the annular loom 10, the composite tubular body is composed of two nonwoven fabrics that can cover more than half of the outer surface of the composite tubular body 3B from two directions symmetrical with respect to the composite tubular body 3B. The tubular fabric 4 may be woven on the nonwoven fabric 33 so as to cover the outer surface of 3B.

  6] The drain material of the present invention can be applied to the case where excess water in the soil is discharged to prevent landslides in mountains, etc., as well as roadbed foundations associated with railway track facilities, roads such as general roads and high-standard roads, etc. It can also be used for drainage from various soils such as roadbed foundations, airport facilities, port facilities, landfills, and sports facilities such as baseball fields and soccer fields.

  Further, by using this drain material, not only the liquid such as surplus water can be discharged, but also the gas in the soil can be discharged. For example, by installing the drain material of the present invention in a vertical direction in a garbage landfill or a soil in which natural gas is buried, the gas in the soil can be discharged through the drain material.

It is a perspective view of the edge part of the drain material which concerns on embodiment of this invention. It is sectional drawing of a composite tubular body. It is explanatory drawing explaining the manufacturing process of a drain material. It is explanatory drawing explaining the process which inject | pours high pressure water and wash | cleans. It is a front view of a heat cutter. It is explanatory drawing explaining the process of cut | disconnecting a tubular body using a heat cutter. It is a perspective view of the edge part of the drain material of a change form. FIG. 8 is a cross-sectional view of the drain material of FIG. 7 during cleaning. It is a perspective view of the edge part of the drain material of another modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain material 2 Tubular body 2a Through-hole 3 Composite tubular body 4 Cylindrical fabric 10 Circular loom 1A Drain material 3A Composite tubular body 30 First tubular body 30a First through-hole 31 Second tubular body 31a Second through-hole 1B Drain material 3B Composite tubular body 33 Non-woven fabric

Claims (11)

A composite tubular body comprising a plurality of tubular bodies having a plurality of through holes formed in the tube wall and having shape retention;
A tubular fabric covering the outer surface of the composite tubular body;
A drain material characterized by comprising:   2. The drain material according to claim 1, wherein the cylindrical woven fabric is a woven fabric including a plurality of warps and wefts continuously woven in a spiral shape with respect to the warps.   The said cylindrical textile fabric coat | covers the outer surface of a composite tubular body in the state closely_contact | adhered to each tubular body located in the outermost side among these several tubular bodies. Drain material.   The drain material according to any one of claims 1 to 3, wherein a weave of the tubular woven fabric is smaller than a through hole of the tubular body.   The drain material according to any one of claims 1 to 3, wherein the weave of the tubular woven fabric is larger than the through hole of the tubular body. The composite tubular body includes a first tubular body having a plurality of first through holes formed in a tube wall and having shape retention, and is disposed along an outer periphery of the first tubular body, and the first through-hole is disposed in the tube wall. A plurality of second tubular bodies formed with a plurality of second through holes larger than the holes and having shape retention,
The drain material according to any one of claims 1 to 3, wherein the weave of the tubular woven fabric is larger than the second through hole.   The drain material according to any one of claims 1 to 6, wherein a nonwoven fabric is interposed between the composite tubular body and the tubular woven fabric.   The drain material according to any one of claims 1 to 7, wherein the tubular body is made of a flexible material.   The drain material according to any one of claims 1 to 8, wherein the tubular body is a tubular woven fabric made of warp and a weft having rigidity. Inserting a composite tubular body having a plurality of through-holes formed in a tube wall and having a plurality of tubular bodies into a ring loom,
By the annular loom, weaving a tubular woven fabric so as to be in close contact with the outer surface of the composite tubular body,
A method for producing a drain material, wherein the composite tubular body and the tubular woven fabric are simultaneously fed out from an annular loom.   The method for producing a drain material according to claim 10, wherein the composite tubular body is inserted into an annular loom while covering the outer surface of the composite tubular body with a nonwoven fabric.

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