JP2009013756A - Structural member for water storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structural member for a water storage tank, which increases usefulness even if this structural member has a function for fitting in a cylindrical leg. <P>SOLUTION: This structural member is constituted by forming a base 12 and the cylindrical leg 13 erected on the base 12 by integrally resin molding them. Fitting parts 14 for fitting end parts of the cylindrical legs 13 in each other are formed in the end parts of the cylindrical legs 13, respectively. The fitting parts 14 are formed into a recessed and projecting shape formed by connecting a first end wall 14a with a second end wall 14b positioned on a terminal side more than the first tip wall 14a like steps. A rib 16 in the leg extended from an inner face of the second end wall 14b to the terminal side is formed on an inner face of a side wall 15 of the cylindrical leg 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structural member for a water storage tank that is used in a plurality of stacked states.

In areas where the population is concentrated, the ground is covered with buildings, asphalt pavement, etc., and the penetration of rainwater and the like into the basement is hindered. Under such circumstances, so-called urban flood damage is likely to occur due to the occurrence of torrential rain. Also, flood damage is likely to occur in the area around the river. Installation of water storage tanks is effective as one of the measures to prevent such flood damage. The water storage tank is a facility that temporarily stores a large amount of rainwater or the like in the ground or allows the stored rainwater or the like to permeate into the soil by flowing rainwater or the like into the tank. Such a storage space of the water storage tank is secured by a plurality of structural members. Such a structural member includes a base and a cylindrical leg erected on the back surface of the base, and is configured to secure a storage space by stacking a plurality of structural members (see Patent Document 1). . In the structural member described in Patent Document 1, the tip of the cylindrical leg is formed in an uneven shape. The cylindrical legs having such a shape are arranged so that the distal end portions of the cylindrical legs are brought into contact with each other when the plurality of structural members are stacked.
JP 2000-352080 A

  In the structural member described in Patent Document 1, an uneven fitting portion is formed at the distal end portion of the cylindrical leg in order to fit the distal end portions of the cylindrical legs in the stacked state. That is, the fitting portion is formed in a concavo-convex shape in which the first tip wall and the second tip wall located on the proximal side of the first tip wall and the tip walls are connected in steps. . The cylindrical leg having such a fitting portion can realize smooth construction and stable lamination by suppressing the displacement of the structural member along the direction orthogonal to the lamination direction when the structural members are stacked. A structure can be formed. Further, the structural member can be easily manufactured and reduced in weight by integrally molding the base and the cylindrical leg with a mold. By the way, the upper part of the water storage tank may be effectively used as, for example, a parking lot or a road by being covered with earth and sand and being maintained by heavy equipment, for example. At this time, since the load of a heavy machine or the like is applied as a compressive load to the laminated structure, the cylindrical leg is required to be able to withstand a predetermined compressive load. However, since the fitting portion described above is formed in a concavo-convex shape, stress tends to concentrate on a specific part of the cylindrical leg when a compressive load is applied. For example, when a load is applied to the second distal end wall from the outside of the cylindrical leg, there is a problem that stress tends to concentrate on the side wall extending from the second distal end wall to the proximal end side of the cylindrical leg. It was. In addition, for example, since the diameter of the convex portion of the fitting portion is smaller than the diameter of the cylindrical leg, the strength of the convex portion is easily secured, while at the boundary portion between the first tip wall and the second tip wall. Stress tends to concentrate. As described above, although a smooth construction can be realized by forming an uneven fitting portion at the tip of the cylindrical leg, the practicality of such a structural member is still not sufficient.

  The present invention has been made in view of such circumstances, and the purpose thereof is a structural member for a water storage tank that can enhance practicality even when a function of fitting to a cylindrical leg is provided. Is to provide.

  In order to achieve the above object, the invention according to claim 1 is a structural member for a water storage tank for securing a storage space of the water storage tank, and the structural member includes a base and the base. A cylindrical leg standing upright is integrally molded with a mold, and the tip of the cylindrical leg of the structural member is stacked at the distal end of the cylindrical leg when the structural members are stacked. A fitting portion for fitting the portions is formed, and the fitting portion includes a first distal end wall, a second distal end wall located on the proximal side with respect to the first distal end wall, and the distal end walls. It is formed in a concavo-convex shape that is connected in a step shape, and a rib in the leg extending from the inner surface of the second distal end wall to the proximal end side is formed on the inner surface of the side wall of the cylindrical leg.

  According to this configuration, the rigidity of the side wall extending from the second distal end wall to the proximal end side is enhanced by the in-leg rib extending from the inner surface of the second distal end wall to the proximal end side. That is, by forming such a leg inner rib, it is easy to prevent deformation of the side wall extending from the second distal end wall to the proximal end side when a load is applied to the second distal end wall from the outside of the cylindrical leg. is there.

  According to a second aspect of the present invention, in the structural member for a water storage tank according to the first aspect, the inner surface of the second tip wall has an abutting portion for abutting the protruding pin of the mold. The gist is that it is provided.

  By the way, since the tip end portion of the above-described cylindrical leg is formed in a concavo-convex shape, the concavo-convex tip portion easily adheres to the mold when the cylindrical leg is resin-molded with a mold. For this reason, there is a problem that the tip end portion of the cylindrical leg is easily deformed when releasing the structural member. Here, the second tip wall is connected to the first tip wall in a step shape. The rigidity of the second tip wall is enhanced by the portion connecting the second tip wall and the first tip wall, and the second tip wall is supported on the side wall by the leg rib. By projecting a contact portion for contacting the protruding pin to the second tip wall, when the pressing force of the protruding pin is applied to the contact portion, deformation at the peripheral portion of the contact portion is prevented. Is easy. Further, since the space on the proximal end side from the second distal end wall is more easily secured than the region between the first distal end wall and the second distal end wall, such a contact portion is provided so as to project. Is easy.

The gist of the invention described in claim 3 is that, in the structural member for a water storage tank according to claim 2, the abutting portion is formed integrally with the leg inner rib.
According to this configuration, the rigidity of the side wall extending from the second distal end wall to the proximal end side is further enhanced by the contact portion formed integrally with the leg inner rib. For this reason, when a load is applied to the second distal end wall from the outside of the cylindrical leg, it is further easier to prevent deformation of the side wall extending from the second distal end wall to the proximal end side. In addition, the leg inner rib formed integrally with the abutting portion makes it easier to prevent the deformation of the peripheral portion of the abutting portion against the pressing force of the protruding pin.

  According to this invention, even if it is a case where the function to fit to a cylindrical leg is provided, practicality can be improved.

Hereinafter, an embodiment embodying the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 (a) and 1 (b), a structural member 11 for a water storage tank is composed of a base 12 having a planar square shape and a cylindrical leg 13 standing on the back surface of the base 12. It consists of and. The structural member 11 is integrally resin-molded with a mold, so that the productivity is enhanced and the weight is reduced. The structural member 11 is used to form a laminated structure that secures a storage space in the water storage tank. Specifically, after arranging the surface of the structural member 11 to match the bottom surface of the hole formed by excavating the ground, the structural members 11 are sequentially stacked so that the back surface and the surface of the base 12 are aligned. Thereby, a laminated structure is formed. The laminated structure formed in this way fulfills the function of supporting the ground on the storage space in addition to securing the storage space of the water storage tank.

  As shown in FIG. 1A, the base 12 is formed by integrally forming a substrate having a quadrangular frame and an in-frame rib disposed on the surface in the frame. The surface of the base 12 is formed to be flush with the frame of the substrate and the ribs in the frame. The substrate is provided with a plurality of through-holes 12a that open on the front and back surfaces, and these through-holes 12a function as a water flow path and an air vent. In addition, a plurality of fitting protrusions 12b protruding from the surface of the substrate are formed at predetermined locations. In the vicinity of the fitting convex portion 12b, a fitting concave portion 12c capable of fitting the fitting convex portion 12b is formed by an in-frame rib or the like. The fitting convex portion 12b and the fitting concave portion 12c are fitted when the structural member 11 is stacked so that the surface of the base 12 and the surface of another base 12 are matched. That is, when the structural member 11 is piled up so that both side portions thereof are aligned, the fitting convex portion 12b and the fitting concave portion 12c are fitted to each other, so that the structural members 11 are connected to each other on the surface side of the base 12. The problem of shifting is suppressed.

  As shown in FIGS. 1 (a) and 1 (b), the cylindrical leg 13 has a bottomed rectangular cylindrical shape that opens on the surface of the substrate, and the diameter of the cylindrical leg 13 decreases from the proximal end toward the distal end. It is formed in a quadrangular frustum shape. When the structural member 11 having the cylindrical leg 13 is stacked such that the rear surface of another structural member 11 is aligned with the surface of the structural member 11 when the structural member 11 is transported, stored, or the like. The cylindrical leg 13 can be inserted from the opening on the surface of the table 12. That is, since the structural member 11 is configured to be capable of nesting, the bases 12 of the plurality of structural members 11 can be brought closer to each other than the length of the cylindrical leg 13. Thus, the capacity occupied by the structural member 11 can be reduced during transportation, storage, and the like. In addition, since the outer peripheral surface of the cylindrical leg 13 of this embodiment is formed in the planar shape which does not have a rib, it becomes difficult for sand etc. to adhere to the outer peripheral surface, and the cylindrical leg 13 causes such a rib as a factor. The problem of breakage can be prevented. Furthermore, since the outer peripheral surface is formed in a planar shape having no ribs, smooth nesting can be realized without the ribs being caught.

  The cylindrical leg 13 of the present embodiment includes corner legs erected at the four corners of the base 12, intermediate legs erected at the middle part of the four sides of the base 12, and the center of the base 12. It consists of a standing central leg. Two intermediate legs are provided for one side of the base 12, and four central legs are provided.

  When the plurality of structural members 11 are stacked, a fitting portion 14 for fitting the tip portions of the cylindrical legs 13 included in the structural members 11 is formed at the distal end portion of the cylindrical leg 13. As shown in FIG. 2, when the structural members 11 are stacked, the structural member 11 with the back surface of the base 12 facing downward is mounted on the structural member 11 arranged with the back surface of the base 12 facing upward. Put. At this time, the fitting part 14 is fitted so that the front-end | tip parts of the cylindrical leg 13 may be faced | matched. Such a fitting suppresses a problem that the structural member 11 that has finished being stacked is displaced along a direction orthogonal to the stacking direction.

  As shown in FIGS. 3 to 5, the fitting portion 14 of the corner leg includes a first distal end wall 14 a and a second distal end wall 14 b positioned on the proximal side with respect to the first distal end wall 14 a. These are formed in a concavo-convex shape from the standing wall 14c connecting the tip walls in a stepped shape. The first tip wall 14 a is composed of a pair spaced apart at the tip of the cylindrical leg 13. Such first tip wall 14a forms a convex portion by connecting the side wall 15 of the cylindrical leg 13 and the tip edge of the standing wall 14c. The second tip wall 14b forms a recess by connecting the side wall 15 and the base edge of the standing wall 14c. In such a fitting state of the fitting portion 14, the outer surface of the first tip wall 14a and the outer surface of the second tip wall 14b come into contact with each other in the pair of cylindrical legs 13 arranged vertically. .

  A through hole 13a is formed in the first tip wall 14a and the second tip wall 14b for the purpose of venting air or the like. Thus, when forming the through-hole 13a in the fitting part 14, from the viewpoint of ensuring the intensity | strength of the fitting part 14, it does not form the through-hole 13a in the standing wall 14c, but the through-hole 13a is formed in the front end wall. It is preferable to form.

  On the inner surface of the side wall 15 constituting the cylindrical leg 13, an in-leg rib 16 extending from the inner surface of the second distal end wall 14b to the proximal end side is formed. By the leg inner rib 16, the rigidity of the side wall 15 extending from the second distal end wall 14b to the proximal end side is enhanced. The leg inner ribs 16 are formed in a columnar shape as a whole, and the protruding length from the inner surface of the side wall 15 is formed to be substantially constant, and is formed to become narrower as approaching the proximal end side from the second distal end wall 14b. ing. By using the leg inner rib 16 having such a shape, the function of increasing the rigidity can be sufficiently exhibited, and the weight of the structural member 11 can be reduced. In the bottomed rectangular tube-shaped cylindrical leg 13 of the present embodiment, one leg-internal rib 16 is formed on each of the four side walls 15.

  Moreover, in the leg rib 16 of this embodiment, the projection length from the side wall 15 is such that the cylindrical leg 13 of another structural member 11 can be inserted from the opening of the cylindrical leg 13 on the surface of the substrate. Is set. That is, the leg inner rib 16 is formed so that the structural member 11 can be nested.

  Thus, in the structure which raises the rigidity of the side wall 15 by forming the leg rib 16, it is preferable to form the 2nd front end wall 14b thickly rather than the side wall 15. FIG. By forming the second tip wall 14b in this way, the rigidity of the entire cylindrical leg 13 can be easily increased.

  A contact portion 17 is provided on the inner surface of the second tip wall 14b for contacting the protruding pin of the mold. Here, the second tip wall 14b is connected to the first tip wall 14a in a stepped manner via a standing wall 14c. The rigidity of the second tip wall 14b is enhanced by the bent portion that connects the second tip wall 14b and the standing wall 14c, and the second tip wall 14b is supported by the side wall 15 by the leg ribs 16. By projecting the contact portion 17 on the second tip wall 14b, it is possible to easily prevent deformation of the peripheral portion of the contact portion 17 when the pressing force of the protruding pin is applied to the contact portion 17. it can. The contact portion 17 of the present embodiment has a cylindrical shape and is formed to extend from the inner surface of the second distal end wall 14b to the proximal end side. Further, the abutting portion 17 is formed to have a dimension shorter than the height dimension of the standing wall 14c so that the pressing force of the protruding pin is suitably transmitted to the distal end portion of the cylindrical leg 13.

  The contact portion 17 of the present embodiment is disposed inside the leg inner rib 16 and is formed integrally with the leg inner rib 16. Thus, the rigidity of the side wall 15 extending from the second distal end wall 14b to the proximal end side can be further increased by the contact portion 17 formed integrally with the leg inner rib 16. The contact portions 17 of the present embodiment are formed in the same number as the leg inner ribs 16, and all the contact portions 17 are formed integrally with the leg inner ribs 16. Further, by disposing the contact portion 17 on the inner side of the leg inner rib 16, it is easy to configure the tip end surface of the cylindrical leg 13 to contact the contact portion 17 in the nesting described above. Thereby, at the time of nesting, it can suppress that the side wall 15 of the cylindrical leg 13 inserted from the opening bites into the rib 16 in a leg. As a result, the structural member 11 can be smoothly separated from the nesting state.

Next, the use state of the structural member 11 of this embodiment is demonstrated.
In the structural member 11 stacked as shown in FIG. 2, the displacement of the structural member 11 along the direction orthogonal to the stacking direction is suppressed by the fitting portion 14 fitting. Thereby, while being able to implement | achieve smooth construction, the stable laminated structure can be formed.

  In addition to stacking the plurality of structural members 11 in the vertical direction as described above, the structural members 11 are arranged in the horizontal direction according to the scale of the water storage tank to be installed, so that a predetermined storage space is secured. Form a structure. Next, the top surface of the laminated structure is covered with earth or the like via a sheet material or the like, for example. For example, by being maintained by a heavy machine, the upper part of the laminated structure, that is, the upper part of the water storage tank can be effectively used as, for example, a parking lot or a road. Thus, when the laminated structure is effectively used, a compressive load is applied to the laminated structure by, for example, a heavy machine. At this time, since the fitting portion 14 is formed in a concavo-convex shape, stress is easily concentrated on a specific portion of the cylindrical leg 13. Specifically, when a load is applied to the second distal end wall 14 b from the outside of the cylindrical leg 13, stress is applied to the side wall 15 extending from the second distal end wall 14 b to the proximal end side of the cylindrical leg 13. Easy to concentrate. In this regard, in the structural member 11 of the present embodiment, the rigidity of the side wall 15 extending from the second distal end wall 14 b to the proximal end side is enhanced by the leg inner rib 16. For this reason, when a load is applied to the second distal end wall 14b from the outside of the cylindrical leg 13, it is easy to prevent the side wall 15 extending from the second distal end wall 14b to the proximal end side from being deformed.

  The structural member 11 of the present embodiment may be applied to a water storage tank that effectively uses the stored water, or a water storage tank having a function of causing water in the water storage tank to permeate into the soil from the wall of the water storage tank. You may apply. That is, the water storage tank indicates a tank having at least a function of storing water, and includes a water storage tank having a function of causing water to permeate into soil in addition to a function of storing water. In order to infiltrate the water in the water storage tank into the soil, a water infiltration sheet is placed between the laminated structure and the soil, thereby suppressing the intrusion of earth and sand into the water storage tank and through the water infiltration sheet. Configure to allow water to permeate the soil.

The effects exhibited by this embodiment will be described below.
(1) In the structural member 11 of this embodiment, the fitting portion 14 formed on the cylindrical leg 13 suppresses the displacement of the structural member 11 along the direction orthogonal to the stacking direction when the structural member 11 is stacked. The Thereby, while being able to implement | achieve smooth construction, the stable laminated structure can be formed. Further, the leg ribs 16 extending from the inner surface of the second distal end wall 14b toward the proximal end side increase the rigidity of the side wall 15 extending from the second distal end wall 14b toward the proximal end side. That is, by forming such a leg rib 16, when a load is applied to the second distal end wall 14 b from the outside of the cylindrical leg 13, the deformation of the side wall 15 extending from the second distal end wall 14 b to the proximal end side is prevented. Easy to do. Therefore, as a result of easily increasing the load resistance of the laminated structure, the upper part of the laminated structure can be effectively used. Thus, since load resistance increases, the structural member 11 with high practicality can be provided. That is, even if it is a case where the function fitted to the cylindrical leg 13 is provided, practicality can be improved.

  (2) The second tip wall 14b is connected to the first tip wall 14a in a stepped manner via a standing wall 14c. For this reason, the rigidity of the second tip wall 14b is enhanced by the bent portion connecting the second tip wall 14b and the standing wall 14c, and the second tip wall 14b is supported by the side wall 15 by the leg ribs 16. . By projecting the contact portion 17 on the second tip wall 14b, it is easy to prevent deformation of the peripheral portion of the contact portion 17 when the pressing force of the protruding pin is applied to the contact portion 17. is there. Therefore, sufficient practicality can be obtained even during resin molding of the structural member 11.

  (3) Since the contact part 17 of this embodiment is formed integrally with the leg inner rib 16, the rigidity of the side wall 15 extending from the second distal end wall 14b to the proximal end side is further enhanced. For this reason, when a load is applied to the second distal end wall 14b from the outside of the cylindrical leg 13, it is further easier to prevent the side wall 15 extending from the second distal end wall 14b to the proximal end side from being deformed. Further, the leg inner rib 16 formed integrally with the contact portion 17 makes it easier to prevent the deformation of the peripheral portion of the contact portion 17 even against the pressing force of the protruding pin. Therefore, the practicality of the structural member 11 can be further enhanced.

  Further, when the contact portion 17 and the leg inner rib 16 are formed at an interval, it becomes difficult to manufacture the mold, such as forming a thin part in the mold, and depending on the thin part, The part to be molded tends to break during molding. On the other hand, in this embodiment, since the contact part 17 is integrally formed with the leg inner rib 16, it can avoid forming a thin part in a metal mold | die. As a result, the design of the mold becomes simple, and the mold can be easily manufactured and is not easily damaged during molding.

  (4) By forming the cylindrical leg 13 in the shape of a frustum that is reduced in diameter as it goes from the proximal end to the distal end, the cylindrical leg 13 is configured to be nestable. When configured in this way, the capacity occupied by the structural member 11 can be reduced during transportation, storage, etc., so that the structural member 11 with excellent handleability is provided, but when the laminated structure is formed, The load concentrates on the fitting portion 14 due to the reduced diameter structure of the cylindrical leg 13. By forming the in-leg rib 16 on the structural member 11, the side wall 15 can be suitably prevented from being deformed.

  (5) In the bottomed rectangular tube-shaped cylindrical leg 13 of this embodiment, one leg-internal rib 16 is formed on each of the four side walls 15. By forming the plurality of leg-internal ribs 16 on the cylindrical leg 13 in this manner, it becomes easier to prevent the side wall 15 extending from the second distal end wall 14b to the proximal end side from being deformed.

  (6) By forming the second tip wall 14b to be thicker than the side wall 15, it is possible to prevent the second tip wall 14b from being whitened or deformed or damaged by the pressing force of the protruding pin. Is easy.

The embodiment may be modified as follows.
The shape of the leg ribs 16 is not particularly limited, and may be changed to, for example, a quadrangular prism shape, a triangular prism shape, or the like. As shown in FIGS. 4 and 5, the leg inner rib 16 has a lateral width dimension of the leg inner rib 16 along the inner periphery of the side wall 15 that is substantially the same as the protruding length dimension from the side wall 15 or the length thereof. It is set wider than the protruding length dimension. For example, the lateral width may be formed narrower than the protruding length. Further, for example, the lateral width of the leg inner rib 16 may be changed to a shape widened to the corner of the cylindrical leg 13.

The length of the leg inner rib 16 is not particularly limited as long as it is formed so as to connect the inner surface of the second tip wall 14 b and the side wall 15.
The number of the in-leg ribs 16 may be appropriately changed according to the uneven shape of the fitting portion 14 or the like. For example, the cylindrical leg 13 shown in FIG. 6A is formed with a pair of a first tip wall 14a and a second tip wall 14b on the left and right, and a single leg rib 16 is formed. . Further, for example, in the fitting portion 14 of the cylindrical leg 13 shown in FIG. 6B, a second tip wall 14b is formed around the first tip wall 14a. Two in-leg ribs 16 are formed in the fitting portion 14. Even in such a case, it is easy to prevent the deformation of the side wall 15 extending from the second distal end wall 14b toward the proximal end and the deformation of the peripheral portion of the contact portion 17.

  -Although the fitting part 14 of the said embodiment is comprised so that the upper-lower paired fitting part 14 which makes the same shape may be fitted, it is made to fit the upper-lower paired fitting part 14 which makes a different shape. You may comprise.

-You may abbreviate | omit the contact part 17 protrudingly provided by the 2nd front end wall 14b.
The vertical wall 14c may be omitted by changing the first tip wall 14a to a hemispherical shape.
-The shape of the contact part 17 is not specifically limited, For example, you may change into shapes, such as square pillar shape.

  -Although the said contact part 17 is integrally formed with the leg internal rib 16, you may form the contact part 17 separately from the leg internal rib 16 as shown to Fig.7 (a). Furthermore, the position where the contact portion 17 is provided may be changed within the range of the inner surface of the second tip wall 14b.

The shape of the cylindrical leg 13 may be changed to a truncated cone shape other than a truncated pyramid shape such as a triangular frustum shape or a hexagonal frustum shape.
-By forming the cylindrical portion of the cylindrical leg 13 in a stepped shape, the cylindrical leg 13 may be formed so as to reduce in diameter as it goes from the proximal end portion toward the distal end portion.

-The number of the cylindrical legs 13 with respect to the base 12 is not specifically limited. One cylindrical leg 13 may be formed integrally with one base 12.
-As shown in Drawing 7 (b) and (c), you may form connecting rib 22 which connects contact part 17 or rib 16 in a leg. Such a connecting rib 22 can further reinforce the second tip wall 14b. Further, when the nesting is performed, the connecting rib 22 is formed so as to come into contact with the distal end surface of the cylindrical leg 13 inserted from the opening, so that the force applied to the distal end surface of the cylindrical leg 13 is dispersed by the connecting rib 22. It becomes like this. For this reason, it is possible to more smoothly separate the structural member 11 from the nesting state as a result of suppressing the tip surface from biting into the contact portion 17.

-You may change the shape of the said base 12 into shapes, such as a plane octagon shape.
-The protrusion length from the side wall 15 is set so that the said leg rib 16 can insert the cylindrical leg 13 of another structural member 11 from the opening of the cylindrical leg 13 in the surface of a board | substrate. That is, the structural member 11 is configured to be nestable in the cylindrical leg 13, but the in-leg rib 16 may be formed so that nesting is impossible.

A through hole 13a is formed in the first tip wall 14a and the second tip wall 14b, but the through hole 13a may be omitted.
The structural member 11 is not limited to a water storage tank that stores rainwater to prevent water damage, but a water storage tank for agricultural water, a water storage tank for fire prevention water, a water storage tank that stores water for fountains, and the like It can also be applied to.

The technical idea that can be grasped from the above embodiment will be described below.
The structural member for the water storage tank is configured such that the cylindrical leg is configured to be capable of nesting, and the contact portion is configured to be in contact with a tip end surface of the cylindrical leg during the nesting. According to this configuration, the structural member can be smoothly separated from the nesting state.

  The rib in the leg is formed for a water storage tank that is formed so that the protruding length from the inner surface of the side wall is substantially constant and becomes narrower as it approaches the proximal end side from the second distal end wall. Structural member. According to this configuration, the function of increasing the rigidity can be sufficiently exhibited, and the weight of the structural member can be reduced.

  A structural member for a water storage tank in which the second tip wall is formed thicker than the side wall. According to this configuration, the rigidity of the entire cylindrical leg can be easily increased.

(A) And (b) is a perspective view which shows the structural member for water storage tanks in this embodiment. The perspective view which shows the structural member of the state piled up. The partial top view which shows a structural member. FIG. 4 is a partial cross-sectional view taken along line AA in FIG. 3. The BB partial sectional view in FIG. (A) And (b) is a fragmentary sectional view which shows the modification of a structural member. (A), (b) and (c) are the partial top views which show the modification of a structural member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Structural member, 12 ... Base, 13 ... Cylindrical leg, 14 ... Fitting part, 14a ... 1st tip wall, 14b ... 2nd tip wall, 15 ... Side wall, 16 ... Rib in leg, 17 ... Contact part.

Claims (3)

A structural member for a water storage tank for securing a storage space of the water storage tank, wherein the structural member is a resin integrally formed with a base and a cylindrical leg standing on the base. The cylindrical leg is formed with a fitting portion for fitting the distal ends of the cylindrical legs of the structural members when the structural members are stacked. The joint portion is formed in a concavo-convex shape in which the first distal end wall, the second distal end wall located closer to the proximal end side than the first distal end wall, and the distal end walls are connected in a stepped shape, A structural member for a water storage tank, characterized in that an inner leg rib extending from the inner surface of the second tip wall toward the proximal end is formed on the inner surface of the side wall. 2. The structural member for a water storage tank according to claim 1, wherein a contact portion for contacting a protruding pin of the mold is provided on an inner surface of the second tip wall. The said contact part is integrally formed with the said rib in a leg, The structural member for water storage tanks of Claim 2 characterized by the above-mentioned.

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