JP5496121B2 - Water storage space forming block - Google Patents

Description

  The present invention relates to a water storage space forming block that is used to form a water storage space such as an underground water storage tank (rainwater storage and penetration facility) by being disposed adjacently vertically and horizontally in the horizontal direction and stacked in the vertical direction.

  Conventionally, a water storage tank (rainwater storage and penetration facility) has been installed in the basement so that rainwater can be temporarily stored during rainfall. By doing so, the occurrence of flood is controlled.

  In addition, it is also considered that rainwater stored in the underground water storage tank is used for fire prevention water, watering of flower beds and fields, and the like.

  The underground water tank as described above was originally constructed with a frame made of perforated concrete blocks.

  However, in recent years, as shown in FIG. 6, the ground 1 is dug to form a concave portion 2 having a rectangular planar shape (including a square), and in the concave portion 2, a resin-made water storage space forming a skeleton is formed. The blocks 3 are arranged vertically and horizontally in the horizontal direction and stacked in multiple stages in the vertical direction to assemble a rectangular parallelepiped (including cube) shape to form a water storage space therein, and then a wall 4 is provided on the outer periphery. In addition, the top plate 5 is attached to the upper surface, and the periphery of the top plate 5 is further covered with a sheet material 6 that is appropriately selected or combined with a water-impervious sheet, a water-permeable sheet, or a protective sheet according to the purpose of rainwater storage or penetration. The underground water tank I is constructed by backfilling the soil. 2a is a flat foundation provided at the bottom of the recess 2.

  The resin-made water storage space forming block (unit member) 3 used for constructing this kind of underground water storage tank I is, for example, as shown in FIGS. A frame-shaped edge 8 that rises in a required direction in the direction, and inside and outside thereof, vertical and horizontal ribs 9a and 9b that are arranged along two directions parallel to each side of the square of the edge 8; A horizontal plate-like base portion 7 provided with a through hole 10 formed in a section surrounded by ribs 9a and 9b projects to the upper surface side of the base portion 7 so that the upper end portion (top wall) is closed and the base portion The whole block is integrally molded with resin as a configuration in which one or a plurality of hollow conical projections (supports) 11 that open on the lower surface side of 7 are provided at a predetermined interval. Note that FIGS. 7A and 7B show a case where there is one protrusion 11 (see, for example, Patent Document 1).

  When the underground water storage tank I as shown in FIG. 6 is constructed using the water storage space forming block 3 having the above-described configuration, when the water storage space forming blocks 3 are assembled by arranging them horizontally and vertically, adjacent water storage spaces are formed. In the formation blocks 3, the outer peripheral end surfaces of the base portions 7 having a square shape in the plan view are abutted with each other, and the butted portions of the base portions 7 are connected by a connecting means (fixing means) not shown in this state. . Thereby, in the constructed underground water tank I (see FIG. 6), the base portion 7 of each water storage space forming block 3 is continuously arranged in a horizontal plane at a certain height position, The horizontal load due to earth pressure acting on the underground water storage tank I from the surrounding soil is a compressive load acting on each base portion 7 of each water storage space forming block 3, more specifically, each of the above The ribs 9a and 9b of the base portion 7 can be received and supported as compressive loads acting along the longitudinal direction.

  In order to construct the underground water storage tank I as shown in FIG. 6 above, when the water storage space forming blocks 3 are stacked in multiple stages in the vertical direction, the lowermost water storage space forming block 3 is provided with a protruding portion. 11 is arranged in a normal posture in which it faces upward, and another water storage space forming block 3 in a posture in which the upper and lower sides are inverted is arranged on the upper side, and the two protruding portions 11 that are arranged to face each other in the vertical direction are butted together. In this state, the butted portions are connected by using a connecting means (fixing means) (not shown). Furthermore, a set of the water storage space forming block 3 that is combined vertically by connecting the protruding portions 11 in the normal posture and the upside down posture in the normal posture and the upside down posture in the same manner as described above is formed in the underground water storage tank I. It is arranged so as to be sequentially stacked with the number of steps corresponding to the desired height dimension. Thereby, in the constructed underground water storage tank I, each water storage space forming block 3 that is stacked in the vertical direction for each position of the protruding portion 11 of each water storage space forming block 3 arranged vertically and horizontally in the horizontal plane. The soil is present in the backfilled portion that acts on the underground water storage tank I from above the top plate 5 (see FIG. 6), and the underground 11 The load in the vertical direction of the object arranged on the ground directly above the water storage tank I can be received and supported as the compressive load of the protruding portion 11 of each water storage space forming block 3 continuously arranged in the vertical direction. It is like that.

Japanese Patent No. 4084437

  However, in the conventional water storage space forming block 3, the vertical and horizontal ribs 9 a and 9 b provided in the base portion 7 are connected to corresponding portions of the lower end portion serving as the base end portion of the protruding portion 11, and the protruding portion 11 is connected. Since the lower end side is firmly connected to the base portion 7, the fact is that the seismic performance is inferior.

  That is, the underground water storage tank I shown in FIG. 6 moves together with the earth and sand existing around it in the event of an earthquake, but the earth pressure acting on the surrounding earth due to this movement is uneven in the circumferential direction. Then, for example, as shown by a two-dot chain line in FIG. 6, there is a risk that the upper and lower portions of the underground water storage tank I are deformed so that the lateral shape becomes a parallelogram by relative displacement in the horizontal direction. .

  When such a deformation occurs in the underground water storage tank I, the water storage space forming block 3 arranged adjacent to the upper and lower sides in a state in which the protrusions 11 are abutted and connected to each other in the normal posture and the upside down posture in the underground water storage tank I. Between each other, both base portions 7 that receive a horizontal load due to earth pressure tend to be relatively displaced in the horizontal direction.

  However, in the conventional water storage space forming block 3, since the protruding portion 11 is firmly connected to the base portion 7 in a state of protruding in the vertical direction, the protruding portions 11 are abutted and connected as described above. In the water storage space forming blocks 3 arranged adjacently in the vertical direction, the relative displacement in the horizontal direction of the base portions 7 is strongly restrained by the connected protruding portions 11.

  Therefore, in addition to the vertical force for supporting the load in the vertical direction, the base portion in each water storage space forming block 3 is provided on the protrusion 11 of each water storage space forming block 3 constructing the underground water storage tank I. Since the horizontal force for resisting the horizontal displacement of 7 is activated, there is a possibility that the local strength of the protrusion 11 may be lowered.

  In the conventional water storage space forming block 3, even if vertical force and horizontal force simultaneously act on the projecting portion 11 during the earthquake as described above, the local strength of the projecting portion 11 does not decrease. As a countermeasure for this, the number of ribs 9a and 9b connecting the protruding part 11 and the base part 7 is increased, or the vertical dimension of the ribs 9a and 9b is increased at the part connected to the protruding part 11, etc. In many cases, measures are taken in such a direction that the unit 7 is more firmly coupled. However, this method causes an increase in the overall weight of the water storage space forming block 3, and the water storage space forming block 3. When the resin is integrally molded with resin, there arises a problem that the mold becomes complicated, and further, the material cost and the manufacturing cost increase. Therefore, there is a limit to increasing the rigidity of the joint portion between the protruding portion 11 and the base portion 7. There .

  Therefore, the present invention deflects the part that joins the horizontal structure part for supporting the horizontal force due to earth pressure and the column part for supporting the load in the vertical direction by an external force that acts during an earthquake or the like. The tilting of the column part from the direction perpendicular to the horizontal structure part can be allowed, thereby acting on the column part to resist the horizontal displacement of the horizontal structure part during an earthquake. An object of the present invention is to provide a water storage space forming block capable of suppressing horizontal force.

  In order to solve the above-mentioned problem, the present invention, corresponding to claim 1, forms a horizontal structure having a support portion arrangement opening by combining ribs extending vertically and horizontally in two directions perpendicular to each other in a horizontal plane. And the base end portion of the column portion extending in the vertical direction is arranged inside the column portion arrangement opening of the horizontal structure portion, a plurality of locations on the outer wall surface of the base end portion of the column portion, and the outside thereof And a portion corresponding to the peripheral edge of the opening for placing the pillar portion of the horizontal structure portion, which is located at a position, integrally connected via a connection portion having rigidity lower than that of the rib forming the horizontal structure portion. A water storage space forming block having

  Further, in the above configuration, the support column is configured to have a truncated pyramid shape with a polygonal horizontal cross-section.

  Further, in the above configuration, the horizontal cross section of the support column has an octagonal outer shape.

  Furthermore, in the above configuration, the point that is the apex of the outer shape of the base end portion of the column portion having an octagonal outer shape is connected to the periphery of the column portion arrangement opening of the horizontal structure portion via the connection portion. The configuration is as follows.

  In each configuration described above, the horizontal structure portion is square, the support portion arrangement opening is a square with sides parallel to the sides of the horizontal structure portion, and the base end portion of the support portion and the horizontal structure portion are The connection part to be connected is configured to be arranged along the diagonal line of the support part arrangement opening.

According to the water storage space forming block of the present invention, the following excellent effects are exhibited.
(1) Ribs extending in two directions perpendicular to each other in a horizontal plane are combined vertically and horizontally to form a horizontal structure portion having a support portion arrangement opening, and the base end portion of the support portion extending in the vertical direction It is arranged inside the support part placement opening of the structure part, and at a plurality of locations on the outer wall surface of the base end part of the support part and the peripheral edge of the support part placement opening of the horizontal structure part located outside thereof Since the corresponding parts are integrally connected via a connection part having rigidity lower than the rigidity of the ribs forming the horizontal structure part, the horizontal structure part and the end part of the column part are horizontally connected. When a force that causes relative displacement is applied, the connecting portion is deflected before an excessive load is applied to the horizontal structure portion or the support column, and the support column can be tilted from a direction perpendicular to the horizontal structure.
(2) Therefore, in the state where the underground water storage tank is formed using the water storage space forming block of the present invention, when an earthquake occurs, the upper and lower portions of the underground water storage tank are relatively displaced in the horizontal direction, and the side shape is parallel four sides. Even when the shape is deformed, the water storage spaces of the respective stages are maintained while maintaining the arrangement structure that is continuous in the vertical direction of the support column portions of the water storage space forming blocks of the respective stages stacked in the vertical direction. Since the horizontal structure part of the building block can be relatively displaced in the horizontal direction, even when an earthquake occurs, a horizontal force acting on the column part to resist the horizontal displacement of the horizontal structure part is applied. It can be greatly suppressed.
(3) Therefore, in the water storage space forming block of the present invention, the functions of the horizontal structure portion that receives a load in the horizontal direction and the column portion that receives a load in the vertical direction can be clearly separated. Therefore, it is possible to design the horizontal structure portion and the column portion separately by setting the horizontal load tolerance and the vertical load tolerance that are applied when constructing the underground water storage tank. The weight of the entire block can be reduced as compared with the space forming block, and the earthquake resistance can be improved.
(4) When the support column is configured in a truncated pyramid shape with a polygonal horizontal cross-section, when the support column is formed into a hollow cylindrical shape, bent portions ( Since the crease) can be provided, the strength against buckling can be increased as compared with the case where the support column is cylindrical.
(5) Further, by adopting a configuration in which the outer shape of the horizontal section of the support column is an octagonal shape, the support column is operated from each direction divided by eight in the circumferential direction in the horizontal plane where the horizontal structure unit is disposed. It is possible to have a uniform rigidity with respect to the external force. Therefore, the column portion has substantially equal rigidity with respect to an external force acting from any direction in the circumferential direction as well as the four directions in which each rib of the horizontal structure portion extends around the column portion. It can be. For this reason, it can suppress that dispersion | variation arises in the intensity | strength with respect to the force of the horizontal direction of the water storage space formation block of this invention by the difference of the azimuth | direction in which the force of a horizontal direction acts.
(6) The configuration is such that the point that is the apex of the outer shape of the base end portion of the column portion having an octagonal outer shape is connected to the peripheral edge of the column portion arrangement opening of the horizontal structure portion via the connection portion. Accordingly, the portion of the support column that is connected to the connection portion can be a bent portion (fold) that becomes the apex of the octagonal outer shape of the outer wall surface of the base end of the support column. The rigidity of the connecting portion with the connecting portion can be increased. Furthermore, if the connection portion is connected to four vertices that are alternated among the eight vertices of the octagonal outer shape on the outer wall surface of the base end portion of the support column, the base end of the support column The structure which connected the said connection part to the equal position of the circumferential direction in the outer wall surface of this can be easily implement | achieved, without weakening local intensity | strength.
(7) Connection for connecting the base end portion of the support column and the horizontal structure unit with the horizontal structure unit having a square shape, and the opening for placing the support column having a square shape with sides parallel to the sides of the horizontal structure unit. By adopting a configuration in which the part is arranged along the diagonal line of the support part arrangement opening, the length of the connection part can be set long, and the bending deformation of the connection part is ensured while ensuring the strength of the connection part. It is possible to adopt an advantageous configuration for allowing In addition, deformation that occurs in the underground water storage tank during an earthquake is likely to occur in the direction perpendicular to each side of the rectangular planar shape of the underground water storage tank, but when following such deformation, the support column is perpendicular to the horizontal structure. The direction of tilting from any direction and the position of the connecting portion can be shifted, and it is possible to provide an advantageous configuration for ensuring the tilting of the support column while ensuring the strength of the connecting portion.

It is a schematic perspective view which shows one Embodiment of the water storage space formation block of this invention. FIG. 2 is an enlarged view of one strut portion and its periphery in the water storage space forming block of FIG. 1, (A) is a plan view, and (B) is a view taken in the direction of arrows AA in (A). The water storage space forming blocks shown in FIG. 1 are stacked in two stages, a normal posture in which the support column protrudes upward and an upside down posture, and the tip portions of the support column portions of the upper and lower water storage space forming blocks. It shows the state where they are brought into contact with each other, (A) shows a normal state, and (B) shows a state in which a force that causes relative displacement in the horizontal direction is applied to the horizontal structure portion of each of the upper and lower water storage space forming blocks. It is a schematic side view. As another form of implementation of the present invention, another example of the connecting portion is shown. (A) is a plan view showing one strut portion and its periphery in the water storage space forming block, and (B) is (B). It is a BB direction arrow directional view. As still another embodiment of the present invention, another example of the connecting portion is shown. (A) shows the case where the connecting portion is a horizontal flat plate, and (B) shows the connecting portion as a horizontal flat plate. (C) is a figure corresponding to FIG. 4 (b) which shows the case where the cross-sectional shape of a connection part is made into a cross shape, when it is set as the reverse T-shaped cross section which consists of a rib. It is a cut side view showing an outline of an underground storage tank. An example of the conventional water storage space formation block is shown, (A) is a schematic plan view, (B) is a schematic side view.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIGS. 1 to 3 (A) and 3 (B) show an embodiment of the water storage space forming block of the present invention, which is as follows.

  That is, the water storage space forming block of the present invention, as indicated by reference numeral 12 in FIGS. 1 and 2 (a) and (b), combines ribs 14a and 14b extending in two directions perpendicular to each other in a horizontal plane, vertically and horizontally, A horizontal structure portion 13 having a structure (lattice structure) having a lattice 15 as a support portion arrangement opening is provided, and inside the lattice 15 in the horizontal structure portion 13 with a certain height dimension in the vertical direction. The base end part which becomes the lower end part of the extending column part 16 is disposed, and a plurality of locations on the outer wall surface of the base end part of the column part 16 and the peripheral edges of the lattices 15 of the horizontal structure part 13 located on the outside thereof are arranged. A required portion of the formed ribs 14a and 14b is integrally connected via a connecting portion 17 having a rigidity lower than the rigidity of the ribs 14a and 14b.

  More specifically, each of the ribs 14a and 14b for constituting the horizontal structure portion 13 has a vertically long rectangular cross section having a certain height dimension in the vertical direction and a certain thickness dimension.

  Further, the horizontal structure portion 13 has a square shape in plan view, and as shown in FIG. 1, two ribs 14a and 14b arranged in parallel at a certain interval at the outer peripheral position along each side of the square. And three ribs 14a and 14b arranged in parallel at a certain interval at a position connecting the intermediate portions of the two opposite sides of the square, and the ribs 14a and 14b are arranged in the same plane. The square grid 15 surrounded by the ribs 14a and 14b is provided at the four locations inside the square corners so that the base ends of the support columns 16 are integrated. The size is slightly larger than the planar shape of the part.

  Further, short ribs 14a and 14b in the vertical and horizontal directions are integrally combined in the right-angle direction on the outer surface of the intermediate position of each side of each lattice 15.

  A through-hole 18 for allowing water to pass through is provided in a section other than the lattice 15 surrounded by the vertical and horizontal ribs 14a and 14b.

  The support column 16 has a cylindrical shape, and the outer shape of the horizontal section is, for example, an octagonal shape as a polygonal shape. Accordingly, by providing bent portions (folds) at circumferentially equally spaced portions of the peripheral wall, the strength against buckling can be increased as compared to the cylinder. Furthermore, since the support column 16 can have an equal rigidity with respect to external force acting from each of the directions divided in the circumferential direction in a horizontal plane, the support column 16 is replaced with the support column 16. In addition to the four directions in which the ribs 14a and 14b of the horizontal structure portion extend in the center, the rigidity can be substantially equal to an external force acting from any direction in the circumferential direction. It is.

  Further, the column-shaped support column 16 has a truncated pyramid shape in which the planar shape gradually decreases from the lower end portion (base end portion) toward the upper end portion (tip end portion), and the opening 19 on the base end side is formed. Further, another water storage space is formed through an opening 19 on the base end side inside each support column 16 of one water storage space forming block 12 so as to be larger than the outer diameter dimension of the distal end portion of the support column 16. A portion projecting upward from the upper end of the horizontal structure portion 13 in each column portion 16 of the block 12 can be accommodated. Thereby, a plurality of the water storage space forming blocks 12 of the present invention can be stacked in a state in which the protruding directions of the support columns 16 are aligned in the same direction. Therefore, the space required for storage and transportation can be reduced by stacking the water storage space forming blocks 12 before use.

  The front end portion of each support column 16 is closed with a top plate 20. Further, as shown in FIGS. 1 and 2 (a), the top plate 20 of each support column 16 has a concentric circle centered on the center of the square which is the planar shape of the horizontal structure 13, and the Engaging protrusions 21 projecting upward and engaging holes 22 for inserting the engaging protrusions 21 are provided at symmetrical positions with the square diagonal as the central axis. As a result, another water storage space forming block 12 having a vertically inverted posture is arranged on the upper side of the water storage space forming block 12 in the normal posture with the support column portion 16 facing upward, When the leading ends of the support columns 16 are brought into contact with each other, one engaging protrusion 21 is inserted into the other engaging hole 22 and the other engaging protrusion 21 is inserted into the one engaging hole 22. Therefore, the tip portions of the support columns 16 that are faced up and down can be connected in a state where the relative displacement in the horizontal direction is constrained.

  The column portion 16 has four vertices, which are every other one of the eight vertices of the octagonal outer shape on the outer wall surface of the base end portion, on the diagonal line of the square lattice 15 provided in the horizontal structure portion 13. In this state, the four vertices of the base end portion of the support column 16 and the horizontal structure portion where the four vertices face each other The individual connecting portions 17 are arranged between the four ribs 14a and 14b along the diagonal of the thirteen lattices 15, and the outer end portions of the connection portions 17 are connected to the corner portions of the lattice 15. In addition to being integrally connected to the formed ribs 14 a and 14 b, the inner ends of the respective connecting portions 17 are integrally connected to the four apexes of the base end portion of the support column portion 16. As a result, the part of the support column 16 that contacts the connecting portion 17 is the four apexes of the octagonal outer shape of the outer wall surface of the base end of the support column 16, that is, the bends (folds) of the peripheral wall. Therefore, it is possible to increase the rigidity of the portion of the support column 16 that contacts the connecting portion 17. Therefore, the corner portions corresponding to the lattices 15 of the horizontal structure portion 13 can be provided at equal positions in the circumferential direction on the outer wall surface of the base end portion of the support column portion 16 through the connection portion 17 without weakening the local strength. Can be connected together.

  The connecting portion 17 for connecting the base end portion of the column portion 16 and the ribs 14a and 14b existing on the periphery of the lattice 15 in the horizontal structure portion 13 is, for example, as shown in FIGS. As shown, the cross-sectional shape is a rectangular cross-sectional shape having the same thickness as each of the ribs 14a and 14b forming the horizontal structure 13 and a smaller height than the ribs 14a and 14b. As a result, the cross-sectional area is reduced as compared with the ribs 14a and 14b. Thus, when the connecting portion 17 and the ribs 14a and 14b are formed of the same resin, the connection The rigidity of the portion 17 is made lower than the rigidity of the ribs 14a and 14b.

  In the water storage space forming block 12 of the present invention, the horizontal structure portion 13, each support column portion 16, and each connection portion 17 are integrally formed of resin.

  The water storage space forming block 12 of the present invention configured as described above has ribs 14a forming the horizontal structure portion 13 at the base end portion of the support column portion 16 inside the lattice 15 of the horizontal structure portion 13. , 14b is connected via a connection portion 17 having a lower rigidity than the front end portion 14b. When a force that causes relative displacement in the horizontal direction acts on the tip end portion of the support column portion 16 and the horizontal structure portion 13. Before an excessive load is applied to the horizontal structure portion 13 and the column portion 16, first, each connection portion 17 connecting the base end portion of the column portion 16 and the horizontal structure portion 13 is bent, and this connection Due to the bending deformation of the portion 17, the support column portion 16 is inclined from the vertical direction of the horizontal structure portion 13. At this time, since the connecting portions 17 that connect the support column 16 to the horizontal structure portion 13 are evenly arranged in the circumferential direction of the support column portion 16, the support column portion 16 is arranged in the vertical direction of the horizontal structure portion 13. Can be tilted in all directions.

  Accordingly, as shown in FIG. 3 (a), the above-described water storage space forming block 12 of the present invention, as shown in FIG. 3A, constructs an underground water tank I as shown in FIG. A structure in which another water storage space forming block 12 having an upside down orientation is arranged on the upper side of the water storage space forming block 12 and the tips of both support columns 16 arranged opposite to each other in the vertical direction are connected to each other. In such a state, the horizontal structural portions 13 of the upper and lower water storage space forming blocks 12 are relatively displaced in the horizontal direction, for example, as shown by the arrow f in FIG. With reference to the position of the horizontal structure 13 of the water storage space forming block 12, when a horizontal leftward force acts on the horizontal structure 13 of the upper water storage space forming block 12, as shown in FIG. Water storage In the space forming block 12, deformations in which each column part 16 is relatively inclined with respect to the horizontal structure part 13 due to the bending deformation of the connection part 17 (see FIGS. 1, 2 </ b> A and 2 </ b> B) as described above are allowed. Therefore, the upper water storage space forming block 12 of the upper water storage space forming block 12 is held with respect to the horizontal structure portion 13 of the lower water storage space forming block 12 while the butted portions of the upper and lower water storage space forming blocks 12 are held. The horizontal structure 13 is displaced in the direction in which the force acts (left side in the figure).

  Therefore, in the water storage space forming block 12 of the present invention, when the underground water tank I is formed in the same manner as the water storage space forming block 3 shown in FIG. When the pressure becomes uneven in the circumferential direction, the upper and lower parts are displaced relative to each other in the horizontal direction as shown by the two-dot chain line in FIG. 6 and the side surface becomes a parallelogram. 3 (a) and (b) has the same arrangement structure as shown in FIGS. 3 (a) and 3 (b) above, and the vertical arrangement of the support columns 16 in the water storage space forming block 12 of each stage stacked in the vertical direction is maintained. In this state, the horizontal structure 13 of the water storage space forming block 12 of each stage can be relatively displaced in the horizontal direction. Thereby, even at the time of the occurrence of an earthquake, the horizontal force acting on the support column 16 to resist the horizontal displacement of the horizontal structure 13 can be greatly suppressed.

  As described above, when the underground water storage tank I is constructed in the same manner as the water storage space forming block 3 shown in FIG. 6, the water storage space forming block 12 of the present invention acts on earth pressure acting from the soil existing around the underground water storage tank I. A horizontal structure 13 that receives a horizontal load from the soil, soil existing in a portion where the underground water tank I acting from above the top plate 5 (see FIG. 6) is refilled with respect to the underground water tank I, and Since the functions of the column 16 that receives the load in the vertical direction of the object placed on the ground directly above the underground water storage tank I can be clearly separated, the horizontal structure 13 and Since the support 16 can be designed by separately determining the horizontal load tolerance and the vertical load tolerance that act when the underground water storage tank I (see FIG. 6) is constructed, the conventional water storage In the space forming block It becomes possible to achieve a weight reduction of the whole block and can be provided with excellent earthquake resistance.

  Moreover, in the water storage space forming block 12 of the present invention, each connection portion 17 that connects the base end portion of the support column portion 16 and the horizontal structure portion 13 is provided along the diagonal direction of the lattice 15 provided in the horizontal structure portion 13. Therefore, the length dimension of each connection portion 17 can be set long, and the configuration is advantageous for allowing the bending deformation while allowing the strength of each connection portion 17 to be ensured. be able to. Further, when the underground water tank I similar to that shown in FIG. 6 is constructed, deformation that occurs in the underground water tank I during an earthquake is likely to occur in a direction perpendicular to each side of the rectangular planar shape of the underground water tank I. Therefore, in order to follow such deformation, in each water storage space forming block 12, it is necessary to incline the support column part 16 toward the center part of each side of the square planar shape of the horizontal structure part 13, At this time, since each of the connection portions 17 is disposed at a position shifted from the direction in which the support column portion 16 is inclined, there is no possibility that any of the connection portions 17 may be stretched. It can be set as the structure advantageous in ensuring the tilting of the said support | pillar part 16, ensuring this.

  In the above, the connecting portion 17 that connects the base end portion of the support column portion 16 and the horizontal structure portion 13 has the same thickness as the ribs 14a and 14b that construct the horizontal structure portion 13 and has a reduced cross-sectional shape. As shown in FIGS. 4 (a) and 4 (b), the height is the same as that of the ribs 14a and 14b, and the thickness is reduced compared to the ribs 14a and 14b. It is good also as the connection part 17a of a cross-sectional shape.

  In the water storage space forming block 12 shown in FIG. 4 having the above configuration, the rigidity of the connection portion 17a can be reduced as compared with the rigidity of the ribs 14a and 14b. If a force that causes relative displacement in the horizontal direction acts on the distal end portion of the support column 16, first, before an excessive load is applied to the horizontal structure 13 and the support column 16, first, the base end of the support column 16 and Each connecting portion 17a connecting the horizontal structure portion 13 is bent, and the support column portion 16 is inclined from the vertical direction of the horizontal structure portion 13 due to the bending deformation of the connecting portion 17a.

  Therefore, also in the embodiment of FIGS. 4A and 4B, the same effect as that of the embodiment of FIGS. 1 to 3A and 3B can be obtained.

  If the rigidity of the connecting portion can be reduced as compared with the rigidity of the ribs 14a and 14b, the connecting portion having a cross-sectional shape flattened in the horizontal direction as shown in FIG. 17b, a cross-sectional inverted T-shaped connecting portion 17c as shown in FIG. 5B, and a cross-shaped cross-shaped connecting portion 17d as shown in FIG. Furthermore, the rigidity of the connecting portion can be reduced as compared with the rigidity of the ribs 14a and 14b of the horizontal structure portion 13, and the connecting portion can be integrally molded with the horizontal structure portion 13 and the column portion 16. Any cross-sectional shape may be employed as long as it is possible.

  In FIGS. 4A and 4B and FIGS. 5A and 5B, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  Note that the present invention is not limited to the above-described embodiment. In each of the above-described embodiments, the configuration including the four support columns 16 has been described. However, the number of support columns 16 is equal to the horizontal structure 13. In the case where the planar shape is square, it is desirable to set the natural number to a squared number in accordance with the dimension of the horizontal structure 13 in the horizontal plane from the viewpoint of equalizing the rigidity in all directions. However, even when the planar shape of the horizontal structure portion 13 is a rectangle other than a square, or even when it is a square shape, the number of support portions 16 may be appropriately changed.

  In the water storage space forming block 12 of the present invention, in the case where the supporting column 16 is singular, the horizontal structure 13 is not a lattice structure, and has a shape including one supporting column arrangement opening at the center of the planar shape. do it.

  The column portion 16 is shown as having an octagonal outer shape in the horizontal section, but may have a polygonal shape other than the octagonal shape. Furthermore, as the support | pillar part 16, you may employ | adopt the circular external shape of a horizontal cross section. In this case, if the support column 16 has a truncated cone shape, the water storage space forming block 12 of the present invention is advantageous in the case of stacking a plurality of the storage column forming blocks 12 with the protruding direction of the support column 16 aligned in the same direction. can do.

  From the standpoint of enabling the water storage space forming block 12 of the present invention to be stacked, the support column 16 is preferably a truncated pyramid shape or a truncated cone shape, but has the same cross-sectional dimension from the proximal end portion to the distal end portion. The shape may be as follows.

  The connecting portions 17, 17a, 17b, 17c, and 17d are arranged at a plurality of equidistant circumferential positions on the outer wall surface of the base portion of the support column 16 and the lattice 15 or the support column arrangement of the horizontal structure unit 13 positioned outside the connection portion 17, 17a, 17b, 17c, and 17d. If it is possible to connect the corresponding portions of the ribs 14a and 14b forming the periphery of the opening, the number of connecting portions 17, 17a, 17b, 17c, and 17d arranged around the column portion 16 is set to 2, It is good also as 3 or 5 or more. Further, from the viewpoint of increasing the rigidity of the joint portion between the column portion 16 having a polygonal outer shape in the horizontal section and the connection portions 17, 17a, 17b, 17c, 17d, the connection portions 17, 17a, 17b, 17c. 17d is preferably connected to a point that is the apex of the outer shape of the base end of the support column 16, but it should be connected to a point other than the apex according to the desired rigidity of the mating part. Also good. Further, the openings 15, 17a, 17b, 17c, 17d are arranged so as to extend in a direction parallel to the ribs 14a, 14b of the horizontal structure 13, such as the lattice 15 or the support part arrangement openings of the horizontal structure 13. It is good also as a structure arrange | positioned in directions other than the diagonal direction of a part.

  As long as the lattice 15 and the support part arrangement opening in the horizontal structure part 13 are configured so that the base end part of the support part 16 can be connected to the inside thereof via the connection parts 17, 17a, 17b, 17c, and 17d, Depending on the shape of the base end portion of the support column 16, a planar shape other than a square shape may be used.

  The outer peripheral edge of the horizontal structure part 13 may be equipped with a joint for connecting with the horizontal structure part 13 of another water storage space forming block 12 arranged adjacent to the horizontal direction or the vertical direction. Good. In this case, when the type of the joint is, for example, a type having irregularities in the horizontal direction, etc., when the ribs 14a and 14b continuous vertically and horizontally cannot be provided on the outermost periphery of the horizontal structure 13, You may make it reduce the thickness dimension of the outermost periphery part of this horizontal structure part 13 rather than the vertical dimension of the ribs 14a and 14b which continue in length and breadth.

  Of course, various modifications can be made without departing from the scope of the present invention.

12 water storage space forming block 13 horizontal structure part 14a, 14b rib 15 lattice (opening part for column part arrangement)
16 Supporting part 17, 17a, 17b, 17c, 17d Connection part

Claims (5)

  Ribs extending in two directions perpendicular to each other in the horizontal plane are combined vertically and horizontally to form a horizontal structure portion having a support portion arrangement opening, and the base end portion of the support portion extending in the vertical direction is connected to the horizontal structure portion. A plurality of locations on the outer wall surface of the base end portion of the support column portion and the corresponding locations of the peripheral edge of the support column arrangement opening portion of the horizontal structure located on the outer side of the support portion placement opening A water storage space forming block, characterized in that the block is integrally connected through a connection portion having a rigidity lower than that of the rib forming the horizontal structure portion.   The water storage space forming block according to claim 1, wherein the support portion has a truncated pyramid shape with a polygonal outer shape in a horizontal section.   The water storage space forming block according to claim 2, wherein the outer shape of the horizontal section of the support column is an octagon.   The water reservoir according to claim 3, wherein a portion which is the apex of the outer shape of the base end portion of the column portion having an octagonal outer shape is connected to the peripheral edge of the column portion arrangement opening of the horizontal structure portion via the connection portion. Space building block.   The horizontal structure portion is a square, the support portion arrangement opening is a square having sides parallel to the respective sides of the horizontal structure portion, and a connecting portion that connects the base end portion of the support portion and the horizontal structure portion, The water storage space forming block according to claim 1, 2, 3, or 4, wherein the block is arranged along a diagonal line of the support portion arrangement opening.

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