JP2015057534A - Drain material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain material having a configuration capable of reducing the manufacturing cost.SOLUTION: A drain material 1 includes: a thermoplastic resin-made pipe 100 which has a plurality of water-permeable holes 103 penetrating in inward/outward directions, in its peripheral wall; and a water-permeable filter which covers the water-permeable holes 103 of the pipe 100. The water-permeable holes 103 are formed to extend linearly in the same direction respectively. Since the water-permeable holes 103 are thus formed to extend linearly in the same direction, the drain material 1 can be increased in water permeation efficiency by being buried so that the direction of the water-permeable holes 103 is along the flow of a water vein in the foundation when used for a liquefaction prevention method for the foundation, and the pipe 100 can be molded using a molding die having a simple structure, so that the manufacturing cost of the drain material 1 can be reduced.

Description

  The present invention relates to a ground material liquefaction prevention method such as a pore water pressure dissipation method, rainwater recharge (returning rainwater to the ground), rainwater pumping (use of wells and groundwater), drainage materials used for embankment drainage, etc. .

  Conventionally, as a drain material, for example, as shown in Patent Document 1, a material in which a water permeable filter is covered on the outer peripheral side of a pipe having a plurality of holes in a peripheral wall is known. Further, as the drain material, for example, as shown in Patent Document 2, it is formed by sequentially laminating a resin string formed by irregularly curling a thermoplastic resin by melting and extruding it into a string shape. One having a water-permeable filter around a cylindrical drainage material is known. Further, as the drain material, for example, a material formed in a cylindrical shape by meandering a string or wire of a thermoplastic resin as shown in Patent Document 3 is known.

Japanese Patent Publication No.6-11990 Japanese Patent No. 4080264 Japanese Patent Laid-Open No. 2003-184064

  The drain material described in Patent Document 1 has a plurality of holes formed radially from the center point of a circle when the pipe is viewed in a cross-section in the cylindrical axis direction. It is difficult to mold using Moreover, since the drain material of the said patent document 2 requires the manufacturing process which laminates | stacks a resin string one by one, it cannot manufacture easily and requires manufacturing cost. The drain material described in Patent Document 2 also requires a manufacturing process for meandering a string or wire of a thermoplastic resin, so that it cannot be easily manufactured and requires manufacturing costs. In addition, although the drain material of a prior art is used for the liquefaction prevention construction method, such a problem is the recharge of rainwater (returning rainwater to the ground), the pumping of rainwater (use of a well, groundwater), This also occurs in drain materials used for embankment drainage and the like.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a drain material having a configuration that can reduce the manufacturing cost.

(1) In order to solve the above-mentioned problem, the present invention provides a pipe made of a thermoplastic resin having a plurality of water permeable holes penetrating in the inner and outer directions on its peripheral wall, and a water permeable filter covering the plurality of water permeable holes of the pipe. The plurality of water permeable holes are formed to extend in the same direction and linearly.

  According to the above configuration, since the plurality of water permeable holes are formed so as to extend in the same direction and linearly, for example, when used in a liquefaction prevention method, the direction of the water permeable holes is a ground water vein. By burying the drain material along the flow, the water transmission efficiency of the drain material can be increased. In addition, since the plurality of water permeable holes are formed to extend in the same direction and in a straight line, it is possible to form a pipe using a mold having a simple structure. Can be reduced.

(2) The water-permeable filter may be disposed on the inner peripheral surface side of the pipe.

  If stones, sand, etc. in the ground adhere excessively to the water permeable filter that covers the water permeable holes, the water permeable holes will not pass water (the water permeable holes will be clogged). According to the above configuration, when water in the soil is allowed to flow into the drain material from the water permeable hole, relatively large stones, sand, etc. are first blocked at the site of the water permeable hole, and then fine sand, etc. is blocked by the water permeable filter. Can be blocked. For this reason, it can prevent effectively that a comparatively big stone, sand, etc. adhere to a water-permeable filter, and can prevent clogging of a water-permeable hole efficiently. In addition, when the water permeable filter is disposed on the outer peripheral side of the pipe, the water permeable filter is always in contact with soil or sand, but since the water permeable filter is disposed on the inner peripheral side of the pipe, Since it is possible to prevent the water permeable filter from coming into contact with soil, sand, or the like in a state of being embedded in the ground, it is possible to effectively prevent the water permeable filter from being deteriorated.

(3) In the configuration of (1) or (2), the plurality of water permeable holes include a first water permeable hole having a predetermined length in the penetrating direction and a length longer than the predetermined dimension in the penetrating direction. 2 water-permeable holes may be included.

  According to the said structure, the 1st water permeable hole and the 2nd water permeable hole from which the length in a penetration direction differs are provided in the drain material. As the length of the water-permeable holes is longer, clogging is less likely to occur, so by providing water-permeable holes of different lengths, all the water-permeable holes may be clogged by sand in the ground at once, or sand etc. Intrusion can be effectively prevented. In particular, when the water permeable filter is disposed on the inner peripheral surface side of the pipe and the moisture in the soil is allowed to flow from the water permeable hole into the drain material, the longer the water permeable hole length is, Even if sand or the like enters, it is difficult for the sand or the like to reach the water permeable filter, and the flow rate of water when it reaches the water permeable filter is reduced. For this reason, it is possible to further prevent all the water-permeable holes from being clogged with sand in the ground at one time and to prevent sand and the like from entering the pipe, and water passing through the water-permeable holes from the outside. Thus, the stress applied to the water permeable filter can be reduced.

(4) In the configuration of (3), the opening area of the first water passage hole may be smaller than the opening area of the second water passage hole.

  As described above, the longer the length of the through hole in the penetration direction, the sand or the like is difficult to reach the water permeable filter, and the water permeable hole is not easily clogged. The flow velocity is also reduced, and this water reduces the stress applied to the water permeable filter. Therefore, the water-permeable hole having a longer length in the penetrating direction is less likely to peel off the water-permeable filter from the pipe at a portion near the water-permeable hole. In the above configuration, the opening area of the first water-permeable hole whose length in the penetrating direction is shorter than that of the second water-permeable hole is made smaller than that of the second water-permeable hole, so that the inside of the pipe passes through the second water-permeable hole. The flow rate of water entering the pipe and the flow rate of water entering the pipe through the first water permeable hole are adjusted to be approximately the same, and the portion in the vicinity of the first water permeable hole in the water permeable filter is the pipe. Can be prevented from peeling off.

(5) In the configuration of (3) or (4), the pipe may be formed in a substantially cylindrical shape.

  According to the above configuration, since the plurality of water permeable holes are formed inward and outward so as to extend linearly in the same direction, the plurality of water permeable holes are formed so as to extend from the outer peripheral surface of the pipe to the inner peripheral surface. It is possible to form the length of each water permeable hole in a non-uniform manner with a simple configuration.

(6) The water permeable filter is a nonwoven fabric made of a thermoplastic resin, and may be integrally formed with a pipe.

  According to the above configuration, for example, when a pipe is formed by injection molding, the pipe material is poured into the mold in a state where the nonwoven fabric is arranged in the mold, and the nonwoven fabric is heated by the heat of the pipe material. And a pipe can be welded together to form a single piece easily. Thereby, a water-permeable film can be easily attached to a pipe. Moreover, since the water permeable film is integrally formed with the pipe, the water permeable filter can be firmly fixed to the pipe, and a gap is formed in which the water permeable filter is separated from or dropped from the water permeable hole of the pipe and is connected to the inside of the pipe. Can be prevented. Furthermore, a member for attaching the water permeable film to the pipe is not necessary, and the drain material can be manufactured more inexpensively.

(7) You may provide the connection part for connecting with another pipe at the both ends of the said pipe.

  According to the said structure, since it can connect with another pipe, it can connect and use several drain materials so that it may become arbitrary length corresponding to the embedding depth of the drain material to the ground. . Moreover, since it can connect with another pipe even if there is no joint member for connecting with another pipe, what connected the several drain material to arbitrary length can be formed in low cost.

(8) The pipe may be formed by welding a bisection with a semicircular cross section, and each of the bisections may be formed by injection molding.

  According to the above configuration, the bisection is configured in such a shape that the pipe is cut along the direction orthogonal to the direction in which the plurality of water permeable holes extend, and each of the bisections uses the upper and lower molds. Since it can be easily manufactured by injection molding, the drain material can be manufactured at a lower cost.

  According to the said structure, the drain material provided with the structure which can reduce manufacturing cost can be provided.

It is a perspective view of the drain material concerning this embodiment. It is the figure which looked at the drain material in FIG. 1 from the A direction. It is CC sectional view taken on the line of the drain material in FIG. It is the figure which looked at the drain material in FIG. 1 from the B direction. It is a perspective view of a 1st component member. It is a perspective view of the 1st component member of the state which removed the water-permeable filter. It is a top view of the 1st component member in the state where the water-permeable filter was removed. It is the figure which looked at the 1st component member in Drawing 7A from the D direction. It is the figure which looked at the 1st component member in Drawing 7A from the E direction. It is the figure which looked at the 1st component member in Drawing 7A from the F direction. It is the figure which looked at the 1st component member in Drawing 7A from the G direction. It is explanatory drawing which shows the manufacturing method of a drain material. It is a figure which shows the liquefaction prevention construction method of the ground using a drain material. It is a partially cutaway side view of the drain material concerning a modification. It is FF arrow sectional drawing of the drain material shown in FIG. It is the figure which connected multiple drain materials shown in FIG. It is explanatory drawing which shows the manufacturing method of the drain material concerning FIG.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
The drain material of the present invention can be used not only for ground liquefaction prevention methods such as pore water pressure dissipation method, but also for rainwater recharge (to return rainwater to the ground) Is also possible. Further, it can be used for pumping rainwater (using wells and groundwater), draining embankments, and the like. As an embodiment (this embodiment) of the present invention, a case where a drain material is used in a liquefaction prevention method (a drain material for a liquefaction prevention method) will be described. Specifically, the drain material according to the present embodiment is a drain material for a pore water pressure dissipation method used in a ground liquefaction prevention method classified as a pore water pressure dissipation method, and a plurality of drain materials are provided by a drain driving machine. By burying the drain material in the ground at a predetermined interval, the horizontal drainage route in the ground is shortened, and the dissipation of excess pore water pressure generated during an earthquake or the like is accelerated to suppress liquefaction.

(Outline of drain material)
First, the outline of the drain material according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of a drain material according to the present embodiment. FIG. 2 is a view of the drain material in FIG. 1 as viewed from the A direction. FIG. 3 is a cross-sectional view of the drain material in FIG. FIG. 4 is a view of the drain material in FIG. 1 viewed from the B direction. Further, in this specification, the top in FIGS. 2 to 4 corresponds to “upper” of the drain material 1, and the lower in FIGS. 2 to 4 corresponds to “lower” of the drain material 1, and FIGS. 3 corresponds to the “front” of the drain material 1, the back in FIG. 2 and FIG. 3 corresponds to the “back” of the drain material 1, and the right in FIGS. 2 and 3 corresponds to the “right” of the drain material 1. Correspondingly, “left” in FIGS. 2 and 3 corresponds to “left” of the drain material 1.

  The drain material 1 according to the present embodiment is used for a ground liquefaction prevention method (for example, a pore water pressure dissipation method). The drain material 1 includes a pipe 100 made of a thermoplastic resin having a plurality of water permeable holes 103 penetrating in the inner and outer directions on its peripheral wall, and a water permeable filter 200 covering the plurality of water permeable holes 103 of the pipe 100. And the some water permeable hole 103 is each formed so that it may extend in the same direction and linear form. Thereby, the drainage efficiency of the drainage material 1 can be improved by burying the drainage material 1 so that the direction of each water-permeable hole 103 follows the flow of water veins in the ground. In addition, since the plurality of water permeable holes 103 are formed to extend in the same direction and linearly, the drain material 1 can be formed using a mold having a simple structure. The manufacturing cost can be reduced.

  And the water permeable filter 200 is arrange | positioned at the inner peripheral surface side of the pipe 100, and by this, a comparatively big stone, sand, etc. are blocked first in the site | part of the water permeable hole 103 (around the water permeable hole 103), and then Fine sand and the like can be blocked by the water permeable filter 200. For this reason, it can prevent effectively that a comparatively big stone, sand, etc. adhere to the water-permeable filter 200, and the clogging of the water-permeable hole 103 can be prevented efficiently. Further, when the water permeable filter 200 is disposed on the outer peripheral side of the pipe 100, the water permeable filter 200 is always in contact with soil or sand, but the water permeable filter 200 is disposed on the inner peripheral side of the pipe 100. Therefore, in a state where the drain material 1 is embedded in the ground, the water permeable filter 200 can be prevented from coming into contact with soil, sand, or the like, so that the water permeable filter 200 can be effectively prevented from being deteriorated. .

(Details of drain material configuration: overall drain material configuration)
The details of the overall configuration of the drain material will be described below with reference to FIGS.
The drain material 1 has, for example, a substantially cylindrical shape with a length in the front-rear direction of about 538 mm, and includes a substantially cylindrical pipe 100 and a water permeable filter 200 attached over the inner peripheral surface of the pipe 100.

  The pipe 100 is a die-molded member made of a thermoplastic resin (made of polyester, polypropylene, or the like), and has, for example, a longitudinal length of 454 mm, an outer diameter of 100 mm, and an inner diameter of 78 mm. The peripheral surface of the pipe 100 has a plurality of ring-shaped horizontal ribs 102 formed so as to be arranged in parallel along the cylindrical axis of the pipe 100, and a flat plate shape formed so as to be orthogonal to the plurality of horizontal ribs 102. A plurality of vertical ribs 101 are formed. More specifically, as shown in FIG. 3, when the pipe 100 is viewed in cross-section in the cylindrical axis direction, a plurality of (for example, 14) vertical ribs 101 are formed so as to be orthogonal to the left half of the horizontal rib 102. A plurality of (for example, 14) vertical ribs 101 are formed so as to be orthogonal to the right half of the horizontal ribs 102. Thus, one water-permeable hole 103 is formed between the two adjacent vertical ribs 101 and the two adjacent horizontal ribs 102, and a plurality of water-permeable holes 103 are formed.

  In this embodiment, since the plurality of horizontal ribs 102 are formed in parallel to each other and the plurality of vertical ribs 101 are also formed in parallel to each other, the plurality of water permeable holes 103 are linearly formed in the same direction. It is formed to extend. As a result, the drainage material 1 is embedded so that the direction of each water-permeable hole 103 follows the flow of the water veins in the ground, so that the water-permeable efficiency of the drain material 1 can be increased. Further, the pipe 100 can be molded using a simple mold.

  Each water-permeable hole 103 is formed so as to extend from the outer peripheral surface of the pipe 100 to the inner peripheral surface. For this reason, when the pipe 100 is viewed in a cross-section in the cylindrical axis direction, in the plurality of water-permeable holes 103 formed in the right half and in the plurality of water-permeable holes 103 formed in the left half, The length is uneven. More specifically, the length of the water passage hole 103 (first water passage hole 103A) positioned in the center in the vertical direction is the shortest in the penetration direction. In the plurality of water-permeable holes 103, the water-permeable holes 103 positioned upward from the first water-permeable holes 103A, the water-permeable holes 103 positioned downward from the first water-permeable holes 103A, The length is getting longer. For example, the lowermost second water permeable hole 103B has a length in the penetrating direction that is longer than the length (predetermined dimension) of the first water permeable hole 103A in the penetrating direction.

  As described above, the plurality of water permeable holes 103 include the first water permeable hole 103A having a predetermined length in the penetrating direction and the second water permeable hole 103B having a length in the penetrating direction longer than the predetermined dimension. Yes. For this reason, it is possible to effectively prevent all the water-permeable holes 103 from being clogged with sand in the ground at one time and sand from entering the pipe 100. More specifically, as the length of the water-permeable holes 103 is longer, clogging is less likely to occur. Therefore, by providing the water-permeable holes 103 having different lengths, all the water-permeable holes 103 may be caused by sand in the ground at one time. It is possible to effectively prevent clogging or sand from entering the pipe. In particular, in this embodiment, since the water permeable filter 200 is disposed on the inner peripheral surface side of the pipe 100, the longer the water permeable hole 103, the sand or the like enters the water permeable hole 103. However, it is difficult to reach the water permeable filter 200, and the water flow rate when the water permeable filter 200 is reached is also reduced. For this reason, it is possible to further prevent all the water-permeable holes 103 from being clogged with sand in the ground at one time, and to prevent sand and the like from entering the pipe 100 and to pass through the water-permeable holes 103 from the outside. The stress applied to the water permeable filter 200 by the incoming water can be reduced. As a result, the water permeable filter 200 can be made difficult to peel off from the pipe 100.

  Further, the plurality of water permeable holes 103 are formed so that the opening area of the first water permeable hole 103A (the area of the opening on the inner peripheral surface side of the drain material 1, the opening area S1 in FIG. 3) is minimized, and The water-permeable hole 103 located upward from one water-permeable hole 103A or the water-permeable hole 103 located downward is formed so that the opening area (the area of the opening on the inner peripheral surface side of the drain material 1) is increased. ing. Therefore, the opening area S1 of the first water permeable hole 103A is smaller than the opening area of the second water permeable hole 103B (the area of the opening on the inner peripheral surface side of the drain material 1, the opening area S2 in FIG. 3). Become. As described above, the water-permeable hole 103 having a longer length in the penetrating direction is less likely to allow sand or the like to reach the water-permeable filter 200 and the water-permeable hole 103 is not easily clogged. The flow rate of water at the time also becomes small. Accordingly, the water permeable filter 103 having a longer length in the penetrating direction is less likely to be peeled off from the pipe 100 in the vicinity of the water permeable hole 103. In the above configuration, the opening area S1 of the first water-permeable hole 103A whose length in the penetrating direction is shorter than the second water-permeable hole 103B is made smaller than the opening area S2 of the second water-permeable hole 103B. Adjusting the flow rate of water entering the pipe 100 through the water-permeable hole 103B and the flow rate of water entering the pipe 100 through the first water-permeable hole 103A, It is possible to prevent the portion near the first water permeable hole 103 </ b> A in 200 from being peeled off from the pipe 100.

  A ring-shaped inner collar portion 1001 is formed inside the front end of the pipe 100, and a ring-shaped inner collar portion 1002 is formed inside the rear end of the pipe 100.

  The permeable filter 200 is a nonwoven fabric having a thickness of about 1 mm or 2 mm, for example, and is integrally formed with the pipe 100 so as to be attached over the region from the inner collar portion 1001 to the inner collar portion 1002. A member for attaching the water permeable filter 200 to the pipe 100 is not necessary, and the drain material 1 can be formed at a low cost. Further, the water-permeable filter 200 is made of a thermoplastic resin (made of polyester, polypropylene, or the like), like the pipe 100. Accordingly, when the pipe 100 is molded, the material of the pipe 100 is placed in the mold while the water permeable filter 200 is placed in the mold, so that the water permeable filter 200 and the pipe 100 are easily welded. Can be integrally molded.

  At both ends of the pipe 100, connecting portions 104 and 105 for connecting to the pipe 100 of the other drain material 1 (“other pipe” of the present invention) are provided integrally with the pipe 100. As a result, the pipe 100 can be connected to the pipe 100 of the other drain material 1, and a plurality of drain materials 1 can be connected so as to have an arbitrary length corresponding to the embedding depth in the ground. . Moreover, even if it does not use the joint member for connecting with the other pipe 100, it can connect with the other pipe 100, and what connected the several drain material 1 can be formed in low cost.

  The connecting portion 105 is, for example, a cylindrical member having a length in the front-rear direction of, for example, 43 mm. A spiral thread groove is formed as an internal thread portion 1051 on the inner peripheral surface of the connecting portion 105. A fitting portion 1054 (fitting groove) made of a predetermined number of ring-shaped convex portions is formed on the outer peripheral surface of the connecting portion 105. And the cover 2 is attached so that the fitting site | part 1054 may be covered.

  The connecting portion 104 is, for example, a cylindrical member having a length in the front-rear direction of, for example, 41 mm. Is formed. The connecting portion 104 is fitted with the connecting portion 105 of the other drain material 1, and the male screw portion 1041 of the connecting portion 104 and the female screw portion 1051 of the connecting portion 105 of the other drain material 1 are screwed together. Thus, another drain material 1 can be connected via the connecting portion 104. Further, the connecting portion 105 of the other drain member 1 is fitted into the connecting portion 105 described above, and the female screw portion 1051 of the connecting portion 105 and the male screw portion 1041 of the connecting portion 104 of the other drain member 1 are screwed. By being attached, another drain material 1 can be connected via the connecting portion 105. As described above, it is possible to easily connect the plurality of pipes 100 (the plurality of drain members 1) by simply screwing the female screw portion 1051 and the male screw portion 1041 together.

  As shown in FIGS. 3 to 4, the drain material 1 described above is formed by welding a semicircular bisection (two constituent members 10) by a method such as ultrasonic welding in a cross-sectional view in the cylindrical axis direction. It becomes. The two constituent members 10 have a shape that is obtained by cutting the drain material 1 along the cylindrical axis direction and dividing the drain material 1 into left and right parts, and the first constituent member 10A on the right side in FIGS. 2 component member 10B.

(Details of configuration of drain material: first component member and second component member)
Below, the structure of 10 A of 1st structural members and the 2nd structural member 10B is demonstrated using FIG. 3, FIG. 5 to FIG. 7E. FIG. 5 is a perspective view of the first component member. FIG. 6 is a perspective view of the first component member with the water permeable filter removed. FIG. 7A is a plan view of the first component member with the water permeable filter removed. FIG. 7B is a view of the first component member in FIG. 7A viewed from the D direction. FIG. 7C is a view of the first component member in FIG. 7A viewed from the E direction. FIG. 7D is a view of the first component member in FIG. 7A viewed from the F direction. FIG. 7E is a view of the first component member in FIG. 7A as viewed from the G direction. 5 to 7E show the first component member 10A. However, since the second component member 10B has a shape that is substantially symmetrical to the first component member 10A, FIGS. 5 to 7E are used. The configuration of the second component member 10B as well as the first component member 10A will be described.

  The first component member 10A and the second component member 10B are members formed by injection molding. The first component member 10A includes a pipe 100A having a shape obtained by cutting a cylinder along the cylindrical axis direction, a connecting portion 104A formed on one end side (rear end side) of the pipe 100A, and the other end side (front end) of the pipe 100A. And a connecting portion 105A formed on the side). The second component member 10B also has the same configuration as the first component member 10A in the left-right symmetry, and although not shown in the drawing, these components are referred to as the pipe 100B, the connecting portion 104B, and the connecting portion 105B. Are described with a reference numeral.

  As shown in FIG. 3, the pipe 100 </ b> A is a member for constituting the right half of the pipe 100. As shown in FIG. 6, a plurality of water permeable holes 103 are formed in the pipe 100 </ b> A, and as shown in FIG. 5, a water permeable filter 200 </ b> A is provided inside the pipe 100 </ b> A so as to cover the plurality of water permeable holes 103. It is attached. The water permeable filter 200 </ b> A is a member constituting the right half of the water permeable filter 200. The second component member 10B also has the same configuration symmetrically, and although not shown, this configuration is described with a reference numeral such as a water permeable filter 200B.

  As shown in FIG. 3, the plurality of water permeable holes 103 are respectively formed so as to extend linearly in a direction orthogonal to the semicircular linear portion when the pipe 100 </ b> A is viewed in cross section in the cylindrical axis direction. . Thus, the first component member 10A can be molded using a simple mold. Moreover, since the 2nd structural member 10B has a left-right symmetric structure with respect to 10A of 1st structural members, it becomes possible to comprise using a simple metal mold | die similarly to 10A of 1st structural members. Therefore, the drain material 1 can be manufactured by molding the first component member 10A and the second component member 10B using a simple mold and joining the first component member 10A and the second component member 10B. Therefore, the manufacturing cost of the drain material 1 can be further reduced.

  An inner flange portion 1002A that forms the right half of the inner flange portion 1002 is formed on the inner side of the end portion on the connection portion 104A side of the pipe 100A, and on the inner side of the end portion on the connection portion 105A side of the pipe 100A, An inner collar portion 1001A constituting the right half of the inner collar portion 1001 is formed. The second component member 10B also has the same configuration symmetrically, and although not shown, these components are described with reference numerals such as the inner flange portion 1001B and the inner flange portion 1002B. .

  As described above, the pipe 100A has a shape obtained by cutting a cylinder, and a portion that hits the cut surface becomes a joint surface for joining a portion that hits the cut surface (joint surface) of the pipe 100B in the second component member 10B. . The joint surface of the pipe 100A and the pipe 100B is welded by a method such as ultrasonic welding, so that the pipe 100 is formed. In the pipe 100A, a convex portion is formed on the joint surface so as to extend in the front-rear direction, and in the pipe 100B, a concave portion formed so that the convex portion can be fitted is formed on the joint surface. At the time of joining the pipe 100A and the pipe 100B, positioning is facilitated by fitting the convex portion and the concave portion. But the recessed part and the convex part do not need to be formed in the joint surface of the pipe 100A and the pipe 100B.

  The connecting portion 104A is a member constituting the right half of the connecting portion 104, and has a shape obtained by cutting a cylinder along the cylindrical axis direction. This cut surface is a cut surface (joint surface) of the connecting portion 104B. It is a joining surface to be joined. The connecting portion 104 is formed by welding the connecting surface between the connecting portion 104A and the connecting portion 104B by a method such as ultrasonic welding. A convex portion is formed on the joint surface of the connecting portion 104 so as to extend in the front-rear direction. The joint surface of the connecting portion 104B of the second constituent member 10B is formed with a concave portion formed so that the convex portion can be fitted, and the convex portion of the concave portion and the connecting portion 104B of the first constituent member 10A. Positioning is facilitated by fitting. But the recessed part and the convex part do not need to be formed in the joint surface of 10 A of 1st structural members, and the 2nd structural member 10B.

  An inner collar portion 1042A is formed on the inner side at the rear end of the coupling portion 104A. The inner collar portion 1042A is a member constituting the right half of the inner collar portion 1042. The connecting portion 104B also has the same configuration in a bilaterally symmetric manner, and although not shown, this configuration is described with a reference numeral such as the inner collar portion 1042B. A plurality of reinforcing ribs extending in the front-rear direction from the inner flange portions 1042A, 1042B to the front end are formed in the connecting portions 104A, 104B.

  The connecting portion 105A is a member constituting the right half of the connecting portion 105, and has a shape obtained by cutting a cylinder along the cylindrical axis direction. This cut surface is a cut surface (joint surface) of the connecting portion 105B. It is a joining surface to be joined. The connection part 105 is formed by welding the joining surface of the connection part 105A and the connection part 105B by a method such as ultrasonic welding. Convex portions are formed at the upper two places and the lower two places on the joint surface of the connecting portion 105A, and a total of four convex portions are formed. On the joint surface of the connecting portion 105B, concave portions formed so that the convex portions can be fitted are formed in the upper two places and the lower two places, and a total of four concave portions are formed. At the time of joining the connecting portion 105A and the connecting portion 105B, the four concave portions of the connecting portion 105B and the four convex portions of the connecting portion 105B are fitted to each other to facilitate positioning. But the recessed part and the convex part do not need to be formed in the joint surface of 105 A of connection parts, and the connection part 105B.

(Drain material manufacturing method)
Below, the manufacturing method of the drain material 1 is demonstrated using FIG. First, the first component member 10A and the second component member 10B are each formed by injection molding. Specifically, a mold a and a mold b for manufacturing the first component member 10A are prepared. Note that the mold a and the mold b are rod-shaped members, the mold a has a quadrangular shape in a cross-sectional view and a semicircular convex portion, and the mold b has a quadrangular shape in a cross-sectional view. This is a shape in which a semicircular recess is formed. Convex portions for forming the vertical rib 101 and the horizontal rib 102 are formed in the concave portion of the mold b. Then, the water permeable filter 200A is arranged in an inner gap (inside the molds a and b) formed by overlapping the convex part of the mold a and the concave part of the mold b. The arrangement position of the water permeable filter 200A in the molds a and b is a part where the pipe 100A is formed. Thereafter, the material of the first component member 10A is placed in the molds a and b in a state of being melted at a high temperature. At this time, since the filter 200A is placed in the molds a and b, the filter 200A is softened by the heat of the material of the first component member 10A. Thereafter, the material of the first constituent member 10A is solidified, so that the first constituent member 10A is formed so that the filter 200A is integrally provided inside the pipe 100A. The second constituent member 10B is formed in the same manner as the first constituent member 10A, and the joint surface of the first constituent member 10A and the joint surface of the second constituent member 10B are welded by a method such as ultrasonic welding, thereby draining. Material 1 is manufactured.

(Prevention of ground liquefaction using drain material)
Below, the ground liquefaction prevention construction method using a drain material is demonstrated using FIG. First, the builder connects a plurality of (for example, ten) drain materials 1 via the connecting portions 104 and 105 so as to have an arbitrary length corresponding to the embedding depth. The installer attaches a cap to the tip of the connection body of the plurality of drain materials 1. Then, the installer hits a tubular pile around the building or the like on the ground so as to surround the building or the like. After this, the installer pulls out the tubular pile after inserting the drain material into the tubular pile so that the cap side is down. Thereby, the connection body of the several drain material 1 can be driven in the ground. In addition, in this embodiment, although the cap is attached to the connection body of the several drain material 1, the cap does not need to be attached. Moreover, it is not necessary to connect and use a plurality of drain materials 1, and a single drain material 1 may be placed on the ground.

(Modification)
(1) In the present embodiment, the fitting portion 1054 is formed on the outer peripheral surface of the connecting portion 105, but the fitting portion 1054 is not necessarily formed, and the fitting portion 1054 is covered. The cover 2 does not need to be attached.

(2) In the present embodiment, the drain material 1 is composed of a bisection (first component member 10A, second component member 10B), but may be composed of three or more segments. In addition, the drain material 1 and the pipe 100 are not limited to a cylindrical shape, and any shape (for example, a rectangular shape in a cross-sectional view) can be adopted as long as the shape is cylindrical.

(3) Moreover, in this embodiment, although the water permeable filter 200 is arrange | positioned at the inner peripheral surface side of the pipe 100, you may arrange | position at the outer peripheral surface side of the pipe 100. A gap may be formed between the inner peripheral surface and the inner circumferential surface.

(4) In the present embodiment, the connecting portion 104 is formed with a male screw portion 1041, the connecting portion 105 is formed with a female screw portion 1051, and the male screw portion 1041 is connected to the female screw portion 1051 of the other drain material 1. The drain material 1 is configured to be connectable to the other drain material 1 by screwing or by screwing the female screw portion 1051 with the male screw portion 1041 of the other drain material 1. You may employ | adopt another structure about the structure for a connection. For example, the connecting portion 104 may be formed with a hook, and the connecting portion 105 may be formed with a hole that engages with the hook. According to this configuration, the hook of the connecting portion 104 is engaged with the hole of the connecting portion 105 of the other drain material 1 or the hole of the connecting portion 105 is the hook of the connecting portion 104 of the other drain material 1. As a result, the drain material 1 is connected to the other drain material 1. The connecting portions 104 and 105 are integrally formed at the same time as the pipe 100 is molded. However, the connecting portions 104 and 105 are formed separately from the pipe 100 and then attached to the pipe 100 by ultrasonic welding or the like. May be. Even in this case, it is easy to manufacture that the pipe 100 is formed by welding the bisections (pipe 100A, 100B) having an anti-circular cross section, and these bisections are formed by injection molding. And it is preferable from a viewpoint of manufacturing cost reduction.

(5) In the present embodiment, the shape of the water permeable hole 103 is rectangular when viewed from the penetration direction, but may be another shape such as a circle. Moreover, although the water permeable hole 103 is regularly formed in the substantially lattice shape in the pipe 100, it is not limited to this structure, You may be irregularly formed in the surrounding wall. Moreover, in this embodiment, in each structural member 10 (1st structural member 10A, 2nd structural member 10B), although the length of the hole in the penetration direction of all the water permeable holes 103 is non-uniform | heterogenous, it is limited to this structure. Any configuration is adopted as long as the first water-permeable hole whose length in the penetration direction has a predetermined dimension and the second water-permeable hole whose length in the penetration direction is longer than the predetermined dimension. Also good. Further, all the lengths in the penetration direction of the water permeable holes 103 formed in the pipe 100 may be the same.

(6) In this embodiment, the drain material 1 is composed of a bisection (first component member 10A, second component member 10B), but may be integrally molded. A drain material 1 ′ that is integrally molded will be described as a modified example with reference to FIGS. 10 to 13. FIG. 10 is a partially cutaway side view of a drain material according to a modified example. FIG. 11 is a cross-sectional view of the drain material shown in FIG. In FIGS. 10 to 13, in the drain material 1 ′, the configuration corresponding to the configuration of the drain material 1 is denoted by the same reference numerals as those of the drain material 1 with “s” added thereto. The drain material 1 ′ has an integral molding point, a point where the inner flange portions 1001 and 1002 are not formed, and the number of vertical ribs 101 ′ and horizontal ribs 102 ′ (that is, the number of through holes 103 ′). Except for the differences, the drain material 1 has substantially the same configuration. Also in the modification, the inner flange portions 1001 and 1002 may be formed, and the number of the vertical ribs 101 ′ and the horizontal ribs 102 ′ (that is, the number of the through holes 103 ′) is made the same as that of the drain material 1. Good.

  FIG. 12 is a diagram in which a plurality of drain materials shown in FIG. 11 are connected. Similarly to the drain material 1 according to the present embodiment, the drain material 1 ′ according to the modified example is externally fitted with the connection portion 105 ′ of the other drain material 1 ′ to the connection portion 104 ′. By screwing the male screw part 1041 ′ and the female screw part 1051 ′ of the connecting part 105 ′ of the other drain material 1 ′, it is possible to connect the other drain material 1 ′ via the connecting part 104 ′. it can. Further, the connecting portion 105 ′ described above is fitted with the connecting portion 104 ′ of the other drain material 1 ′, and the female screw portion 1051 ′ of the connecting portion 105 ′ and the connecting portion 104 ′ of the other drain material 1 ′ are connected. By screwing the male screw portion 1041 ′, another drain material 1 ′ can be connected via the connecting portion 105 ′. As described above, the plurality of pipes 100 ′ (the plurality of drain materials 1 ′) can be easily connected by simply screwing the female screw portion 1051 ′ and the male screw portion 1041 ′ together. 10 and 12, the cover 2 'is omitted, but the cover 2' may be wound around the outer periphery of the connecting portion 105 '.

  Below, the manufacturing method of drain material 1 'concerning a modification is demonstrated. FIG. 13 is an explanatory view showing a method of manufacturing the drain material 1 ′ according to FIG. The drain material 1 ′ (pipe 100 ′) is formed by injection molding. Specifically, a mold a ′, a mold b ′, and a mold c ′ for preparing the drain material 1 ′ (pipe 100 ′) are prepared. The mold a ′, the mold b ′, and the mold c ′ are rod-shaped members, and the molds a ′ and b ′ have a shape in which a semicircular concave portion is formed in a quadrangular shape in a cross-sectional view, The mold c ′ is circular in a sectional view. When the concave portion of the mold a ′ and the concave portion of the mold b ′ are overlapped, a circular space is generated in a sectional view, but the diameter of the mold c ′ is smaller than the diameter of the circle in this space. The molds a ′, b ′, and c ′ are arranged so that the mold c ′ is inserted into a space formed by overlapping the recesses of the mold a ′ and the mold b ′. As a result, a ring-shaped gap is formed between the molds a ′ and b ′ and the mold c ′ in a sectional view. In this ring-shaped gap, a water permeable filter 200 ′ is disposed around the mold c ′. In this state, the material of the drain material 1 ′ (pipe 100 ′) is put into a ring-shaped gap in the mold a ′, the mold b ′, and the mold c ′ while being melted at a high temperature. At this time, the material of the drain material 1 ′ is put outside the filter 200 ′. Since the filter 200 ′ is placed in the ring-shaped gap, the filter 200 ′ is softened by the heat of the material of the drain material 1 ′. Thereafter, the drain material 1 ′ (pipe 100 ′) is formed by solidifying the material of the drain material 1 ′ so that the filter 200 ′ is integrally provided inside the pipe 100 ′.

  In addition, about connection part 104 ', 105', it integrally molds with the said pipe 100 'using another metal mold | die. If it demonstrates concretely, as a metal mold | die for forming connection part 104 ', a rod-shaped 1st metal mold | die, a 2nd metal mold | die, and a 3rd metal mold | die will be prepared. The first mold and the second mold have a shape in which a semicircular concave portion is formed in a quadrangular shape in a sectional view, and the third mold is a circular shape in a sectional view. When the concave portion of the first mold and the concave portion of the second mold are overlapped, a circular space is generated in a cross-sectional view, but the diameter of the third mold is smaller than the diameter of the circle in this space. A spiral convex portion for forming a male screw portion 1041 ′ is formed in the concave portion of the first mold and the concave portion of the second mold. The first to third molds are arranged so that the third mold is inserted into a space formed by overlapping the recesses of the first mold and the recesses of the second mold. As a result, a ring-shaped gap is formed between the first and second molds and the third mold in a sectional view. In the ring-shaped gap, the material of the drain material 1 ′ (pipe 100 ′) is put in a melted state at a high temperature. After this, the connecting portion 104 ′ is formed by solidifying the material of the drain material 1 ′. The connecting portion 105 ′ is formed in the same manner, but a male screw portion 1041 ′ is formed in the concave portion of the first mold and the concave portion of the second mold for forming the connecting portion 105 ′. Instead of the convex portion, a convex portion for forming the fitting portion 1054 'is formed. A spiral convex portion for forming the female screw portion 1051 ′ is formed around the third mold for forming the connecting portion 105 ′.

  In this embodiment and the modification, the water permeable filter 200 ′ is attached to the inner peripheral surface of the drain material 1 ′, but the water permeable filter 200 ′ may be attached to the outer peripheral surface of the drain material 1 ′. .

(7) In the present embodiment and the modification, the case where the drain materials 1, 1 ′ are used for the pore water pressure dissipation method is described, but the drain materials 1, 1 ′ are used for the liquefaction prevention method for other ground. Also good. Also, drain materials 1, 1 'are used not only for liquefaction prevention methods, but also for other purposes such as rainwater recharge (returning rainwater to the ground), rainwater pumping (use of wells and groundwater), drainage of embankments, etc. May be.

1, 1 'Drain material 100, 100' Pipe 100A Pipe 100B Pipe 103, 103 'Water-permeable hole 104, 104' Connection part 1041, 1041 'Male thread part 104A Connection part 104B Connection part 105, 105' Connection part 105A Connection part 105B Connection part 1051,1051 'Female thread part 200,200' Permeable filter 200A Permeable filter 200B Permeable filter S1 Opening area S2 Opening area

Claims (8)

A pipe made of a thermoplastic resin having a plurality of water permeable holes penetrating in the inner and outer directions on its peripheral wall, and a water permeable filter covering the plurality of water permeable holes of the pipe;
The plurality of water permeable holes are formed to extend in the same direction and linearly, respectively.
Drain material characterized by that. The water permeable filter is disposed on the inner peripheral surface side of the pipe,
The drain material according to claim 1. The plurality of water permeable holes include a first water permeable hole having a predetermined length in the penetrating direction and a second water permeable hole having a length in the penetrating direction longer than the predetermined dimension.
The drain material according to claim 1 or 2, wherein The opening area of the first water passage hole is smaller than the opening area of the second water passage hole,
The drain material according to claim 3. The pipe is formed in a substantially cylindrical shape,
The drain material according to claim 3 or 4, wherein: The water permeable filter is a nonwoven fabric made of thermoplastic resin, and is integrally molded with the pipe.
The drain material according to any one of claims 1 to 5, wherein: Provided at both ends of the pipe with connecting portions for connecting with other pipes,
The drain material according to any one of claims 1 to 6, wherein: The pipe is formed by welding halves having a semicircular cross section, and these halves are formed by injection molding.
The drain material according to any one of claims 1 to 7, wherein

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