Unit block member of rainwater storage and infiltration facility and rainwater storage and infiltration facility

Abstract

Provided is a unit block member for a rainwater storage and infiltration facility that can be constructed with the height of a unit block portion for one stage by a new structure. 【Solution means】The unit block member 2 (3, 4) of the rainwater storage and infiltration facility includes a lattice frame portion 21 (31, 41) formed in a lattice shape having one or more meshes 21a (31a, 41a), and one or more protrusions 22 (32, 42) that are disposed at positions corresponding to one or more meshes 21a (31a, 41a) of the lattice frame portion 21 (31, 41) and protrude out of the plane of the lattice frame portion 21 (31, 41), and are integrally provided. The upper lattice frame portion 21 (31, 41) is configured to be placed and fitted on the lower protrusions 22 (32, 42).

Description

Technical Field

[0001] The present invention relates to a unit block member used in a rainwater storage and infiltration facility.

Background Art

[0002] Generally, a rainwater storage and infiltration facility is installed underground in public facilities such as roads, parks, and parking lots, and a large number of unit block members formed of a plastic material are assembled in multiple sets in the horizontal and vertical directions. Then, the periphery of the structure is covered with a water-permeable and water-blocking sheet to store rainwater in the voids inside the facility. As unit block members used in such rainwater storage and infiltration facilities, various structures have been developed.

[0003] For example, Patent Document 1 discloses a configuration in which unit members that form the structure of the facility are arranged in close contact in the horizontal and vertical directions, and the spaces between the unit members are connected by joint members. In addition, as disclosed by the inventors of the present application in Patent Document 2, a unit block member in the form of a four-leg block having a square plate and four hollow cylindrical legs has been developed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when connecting the unit block members (unit members) vertically in the above-described conventional rainwater storage and infiltration facility, the unit block members are alternately inverted and connected. Therefore, the height of the unit block members for two levels is the basis, making it difficult to adapt to the conditions of the installation site and the required capacity.

[0006] Therefore, an object of the present invention is to provide a unit block member for a rainwater storage and infiltration facility that can be constructed with the height of a single-level unit block member by a new structure.

Means for Solving the Problems

[0007] In order to achieve the above object, the unit block member of the rainwater storage and infiltration facility of the present invention integrally includes a lattice frame portion formed in a lattice shape having one or more meshes, and one or more protruding portions disposed at positions corresponding to one or more of the meshes of the lattice frame portion and protruding out of the plane of the lattice frame portion. The upper lattice frame portion is configured to be placed and fitted on the protruding portion of the lower stage.

Effects of the Invention

[0008] As described above, the unit block member of the rainwater storage and infiltration facility of the present invention integrally includes a lattice frame portion formed in a lattice shape having one or more meshes, and one or more protruding portions disposed at positions corresponding to one or more of the meshes of the lattice frame portion and protruding out of the plane of the lattice frame portion. The upper lattice frame portion is configured to be placed and fitted on the protruding portion of the lower stage. With such a configuration, it becomes a unit block member of a rainwater storage and infiltration facility that can be constructed with the height of a single-level unit block member.

Brief Description of the Drawings

[0009]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the constituent elements described in the following examples are illustrative, and are not intended to limit the technical scope of the present invention thereto.

EXAMPLE

[0011] (Overall configuration) First, the overall structure of the rainwater storage and infiltration facility 1 will be described. As shown in FIGS. 1 to 3, the rainwater storage and infiltration facility 1 is configured as a three-dimensional rectangular parallelepiped as a whole and is buried underground in public facilities such as roads, parks, and parking lots. And although not shown in the drawings, the rainwater storage and infiltration facility 1 is completed by covering the whole with a water barrier sheet, a water permeable sheet, and a protective sheet and then backfilling. Although not described in the embodiments, in addition to this, an inflow trough and an outflow trough are installed adjacent to the rainwater storage and infiltration facility 1, and an inspection manhole or the like is installed inside as necessary.

[0012] And the rainwater storage and infiltration facility 1 of this embodiment is composed of a plurality of unit block members 2 of a basic square shape in plan view, ···, a plurality of half block members 3 as unit block members of half the size of the square, ···, a plurality of quarter block members 4 as unit block members of a quarter of the size of the square, ···, and a plurality of flat top plate members 5 fitted on the top, ···.

[0013] Regarding a specific arrangement example, as shown in FIGS. 1 to 3, in the lower stage, four basic (1 / 1 size) unit block members 2, 2, 2, 2 are arranged in two rows and two columns in a plane (XY direction) (see also FIG. 11). In the upper stage, one basic unit block member 2 is installed on the centers of the four basic unit block members 2, 2, 2, 2 in the lower stage. Further, four half block members 3, 3, 3, 3 are installed adjacent to the four sides of the basic unit block member 2 in the upper stage, and four quarter block members 4, 4, 4, 4 are installed at the four corner portions. Hereinafter, the configurations of the respective unit block members 2, 3, 4 will be described.

[0014] (Unit block member of basic (1 / 1) size) The basic (1 / 1 size) unit block member 2 is made of synthetic resin and has a lattice frame portion 21 formed in a square lattice shape as a whole, having nine cells 21a,... with 3 rows vertically and 3 columns horizontally, and nine protruding portions 22,... arranged at positions corresponding to the 3 rows vertically and 3 columns horizontally of the square cells 21a of this square lattice frame portion 21 and protruding out of the plane of the lattice frame portion 21. Here, the "cells with 3 rows vertically and 3 columns horizontally" means that there are lengths of cells 21a,... for 3 rows vertically and also lengths of cells 21a,... for 3 columns horizontally. That is, if the length of one side of the square cell 21a is L, it has a length of 3L vertically and 3L horizontally.

[0015] The lattice frame portion 21 partitions nine cells 21a,... with 3 columns vertically and 3 columns horizontally. And as shown in FIG. 5, two types of fitting holes 21b and 21c are formed at the intersections of the lattice of the lattice frame portion 21. That is, fitting holes 21c into which the rounded square convex pieces 26 on the top surface 24 of the protruding portions 22 at the corner portions described later are fitted are formed at the four intersections closer to the center. On the other hand, fitting holes 21b into which the divided convex pieces 25a constituting the groove portion 25 described later are fitted are formed at the eight intersections on the four peripheral sides. Further, fitting holes 21d are formed at the corner portions of the lattice frame portion 21. The divided convex pieces 35b and 45b described later are fitted into the fitting holes 21d at the corner portions.

[0016] And nine trapezoidal (truncated rounded square pyramid frustum-shaped) protruding portions 22,... are integrally formed corresponding to the nine cells 21a,... of the lattice frame portion 21. Each protruding portion 22 is composed of four support legs 23,... extending from the vicinity of the corner portions (intersections of the lattice) of the cell 21a of the lattice frame portion 21 and a top surface 24 supported by the four support legs 23,.... The four support legs 23,... are tapered so as to approach each other as they move away from the lattice frame portion 21. In this way, through the four support legs 23,...., the load is configured to be distributed and transmitted from one top surface 24 in the upper stage to the four protruding portions 22 (top surfaces 24 thereof) in the lower stage,....

[0017] And the top surfaces 24,... of the plurality of protrusions 22,... form the same plane with each other, and this plane is substantially parallel to the plane formed by the lattice frame portion 21. Therefore, by placing and fitting the lattice frame portions 21 of the upper unit block members 2(3, 4) on this plane, the unit block members 2(3, 4) can be stacked in the same direction (while shifting them by half) without being inverted alternately.

[0018] Among the nine top surfaces 24,..., four top surfaces 24,... corresponding to the corner portions of the lattice frame portion 21 are formed with rounded rectangular convex pieces 26,.... On the other hand, among the nine top surfaces 24,..., four top surfaces 24,... corresponding to the sides of the lattice frame portion 21 are formed with groove portions 25 in a direction perpendicular to the sides. More specifically, the groove portion 25 is formed as a gap between two divided convex pieces 25a, 25a. Further, among the nine top surfaces 24,..., one top surface 24 corresponding to the center of the lattice frame portion 21 is formed with a circular hole 27.

[0019] (Half (1 / 2) - size unit block member) As shown in FIGS. 6 and 7, the half - block member 3 as a half (1 / 2) - size unit block member is made of synthetic resin and includes a lattice frame portion 31 formed in a rectangular lattice shape having a grid pattern 31a of 3 in length and 1.5 in width, and three protrusions 32,... arranged at positions corresponding to the square grid pattern 31a of 3 in length and 1.5 in width of the rectangular lattice frame portion 31 and protruding out of the plane of the lattice frame portion 31. Here, the "grid pattern of 3 in length and 1.5 in width" means that in the vertical direction, there is a length of three rows of grid patterns 31a,..., and in the horizontal direction, in addition to the length of one column of grid patterns 31a, there is a length half of that of the grid pattern 31a. That is, if the length of one side of the square grid pattern 31a is L, the length is 3L vertically and 1.5L horizontally.

[0020] The grid frame portion 31 demarcates three cells 31a, ···, arranged in three vertical rows and one and a half horizontal rows. As shown in FIG. 7, two types of fitting holes 31b and 31c are formed at the intersections of the grid of the grid frame portion 31. That is, fitting holes 31c are formed at two intersections closer to the center, into which the rounded rectangular convex pieces 36 (26, 46) on the top surface 34 of the protruding portions 32 (22, 42) of the corner portions described later fit. On the other hand, fitting holes 31b are formed at four intersections on the three peripheral sides, into which the split convex pieces 35a (25a, 45a) that constitute the groove portions 35 (25, 45) described later fit.

[0021] And corresponding to the three cells 31a, ··· of the grid frame portion 31, three trapezoidal (truncated rounded square pyramid-shaped) protruding portions 32, ··· are integrally formed. Each protruding portion 32 is composed of four support legs 33, ··· extending from the vicinity of the corner portions (grid intersections) of the cell 31a of the grid frame portion 31, and a top surface 34 supported by the four support legs 33, ···. The four support legs 33, ··· are tapered, inclining so as to approach each other as they move away from the grid frame portion 31. In this way, the load is configured to be distributed and transmitted from the single top surface 34 in the upper stage to the top surfaces 34 (24, 44) of the four protruding portions 32 (22, 42) in the lower stage, ··· through the four support legs 33, ···.

[0022] And the top surfaces 34, ··· at the tips of the three protruding portions 32, ··· form the same plane with each other, and this plane is substantially parallel to the plane formed by the grid frame portion 31. Therefore, by placing and fitting the grid frame portion 31 of the upper unit block member 3 (2, 4) on this plane, the unit block members 3 (2, 4) can be stacked in the same direction (while shifting them by half) without being inverted alternately.

[0023] Of the three top surfaces 34, ···, on the two top surfaces 34, 34 corresponding to both sides of the lattice frame portion 31, rounded square convex pieces 36, 36 are formed. On the other hand, among the three top surfaces 34, ···, on the central one top surface 34, ··· corresponding to the side of the lattice frame portion 31, a groove portion 35 is formed in a direction perpendicular to the side. More specifically, the groove portion 35 is formed as a gap between two divided convex pieces 35a, 35a.

[0024] In addition, as shown in FIG. 6, at the same level as the plane formed by the top surfaces 34 of the three protruding portions 32, ···, a linear protruding frame portion 38 is integrally formed parallel to the long side of the lattice frame portion 31. And in the protruding frame portion 38, divided convex pieces 35a, 35a are installed facing the rounded square convex pieces 36, 36 on both sides, and divided convex pieces 35b, 35b (about half the size of the divided convex piece 35a) are installed facing the central groove portion 35.

[0025] (Quarter (1 / 4) - size unit block member) The quarter - block member 4 as a quarter (1 / 4) - size unit block member is made of synthetic resin and has a lattice frame portion 41 formed in a small - square lattice shape having grid cells 41a with a vertical size of 1.5 and a horizontal size of 1.5, and one protruding portion 42 arranged at a position corresponding to the 1.5×1.5 square grid cells 41a of the small - square lattice frame portion 41 and protruding out of the plane of the lattice frame portion 41. Here, the "grid cells with a vertical size of 1.5 and a horizontal size of 1.5" means that vertically, in addition to one row of grid cells 41a, there is a length half of that of the grid cell 41a, and horizontally, in addition to one column of grid cells 41a, there is a length half of that of the grid cell 41a. That is, if the length of one side of the square grid cell 41a is L, the vertical and horizontal lengths are 1.5L.

[0026] The grid frame portion 41 demarcates one cell 41a, ··· that is 1.5 rows in the vertical direction and 1.5 columns in the horizontal direction. And, as shown in FIG. 9, two types of fitting holes 41b, 41c are formed at the intersections of the grids of the grid frame portion 41. That is, at one central intersection, a fitting hole 41c is formed into which a rounded square convex piece 46 (26, 36) on the top surface 44 of a protruding portion 42 (22, 32) described later fits. On the other hand, at two intersections on the two peripheral sides, fitting holes 41b are formed into which split convex pieces 45a (25a, 35a) that constitute groove portions 45 (25, 35) described later fit.

[0027] And, corresponding to one cell 41a, ··· of the grid frame portion 41, one trapezoidal (truncated rounded square pyramid frustum-shaped) protruding portion 42, ··· is integrally formed. The protruding portion 42 is composed of four support legs 43, ··· that extend from the vicinity of the corner portions (grid intersections) of the cell 41a of the grid frame portion 41, and a top surface 44 supported by the four support legs 43, ···. The four support legs 43, ··· are tapered so as to incline closer to each other as they move away from the grid frame portion 41. In this way, through the four support legs 43, ···, the load is configured to be distributed and transmitted from one top surface 44 in the upper stage to the top surfaces 44 (24, 34) of the four protruding portions 42 (22, 32) in the lower stage, ···.

[0028] And, the top surface 44 at the tip of the protruding portion 42 constitutes a plane, and this plane is substantially parallel to the plane formed by the grid frame portion 41. Therefore, by placing and fitting the grid frame portion 41 of the upper-stage unit block member 4 (2, 3) on this plane, the unit block members 4 (2, 3) can be stacked (while shifting them by half) in the same direction without having to invert them alternately.

[0029] A rounded square convex piece 46 is formed on one top surface 44.

[0030] In addition, as shown in FIG. 8, an L-shaped protruding frame portion 48 is integrally formed parallel to the orthogonal bisector of the lattice frame portion 41 at the same level as the plane formed by the top surface 44 of one protruding portion 42. In the protruding frame portion 48, split convex pieces 45a, 45a are provided facing the rounded square convex piece 46, and split convex pieces 45b (having approximately half the size of the split convex piece 45a) are provided at the corner portions.

[0031] As shown in FIG. 10, the top plate member 5 is made of synthetic resin and has a flat plate-shaped main body portion 50 having the same size as the lattice frame portion 21 of the basic unit block member 2. In the main body portion 50, thirteen rounded square fitting holes 51c,... are provided at the same positions as the nine protruding portions 22,... of the basic unit block member 2 and at the same positions as the four intersections closer to the center of the lattice frame portion 21. The fitting hole 51c has the same size as the fitting hole 21c of the basic unit block member 2, the fitting hole 31c of the half block member 3, and the fitting hole 41c of the quarter block member 4. On the other hand, eight fitting holes 51b,... into which the split convex pieces 25a (35a, 45a) constituting the groove portions 25 (35, 45) are fitted are formed at the eight trisection points on the four sides of the main body portion 50.

[0032] (Positional relationship between the upper and lower unit block members) Next, with reference to FIGS. 11 and 12, the positional relationship (fitting relationship) between the upper basic unit block member 2 and the lower basic unit block members 2, 2, 2, 2 in the rainwater storage and infiltration facility 1 of this embodiment will be described. Here, as shown by the dashed line in FIG. 11, the case where the four lower unit block members 2, 2, 2, 2 are arranged in two vertical rows and two horizontal rows, and one upper unit block member 2 is placed and fitted thereon will be described.

[0033] The upper unit block member 2 is installed with a shift of 1 / 2B (where B is the total width of the unit block member 2) from the arrangement of the lower unit block members 2. That is, as shown in FIGS. 11 and 12, the four corner portions of the lattice frame portion 21 of the upper unit block member 2 are arranged so as to overlap with the centers of the circular holes 27 on the top surfaces 24 of the central protruding portions 22 of the lower unit block members 2, respectively.

[0034] Specifically, the center of the circular hole 27 on the top surface 24 of the protruding portion 22 at the center of the upper unit block member 2 is positioned above one joint point where the corner portions of the four unit block members 2 in the lower stage overlap. In other words, the positions are determined by fitting the eight fitting holes 21b, ··· provided at the central positions of each side into the groove portions 25, ··· of the unit block members 2 in the lower stage.

[0035] (Effect) Next, the effects exhibited by the unit block members 2 (3, 4) of the rainwater storage and infiltration facility of this embodiment will be listed and described.

[0036] (1) As described above, the unit block members 2 (3, 4) of the rainwater storage and infiltration facility include a lattice frame portion 21 (31, 41) formed in a lattice shape having one or more meshes 21a (31a, 41a), and one or more protruding portions 22 (32, 42) disposed at positions corresponding to one or more meshes 21a (31a, 41a) of the lattice frame portion 21 (31, 41) and protruding out of the plane of the lattice frame portion 21 (31, 41). The upper lattice frame portion 21 (31, 41) is configured to be placed and fitted on the protruding portions 22 (32, 42) in the lower stage. With such a configuration, the rainwater storage and infiltration facility 1 that can be constructed with the height of one unit block member 2 (3, 4) by a new structure can be built. Furthermore, no special connectors are required during assembly.

[0037] (2) Also, since it includes a lattice frame portion 21 formed in a lattice shape having a 3×3 grid of vertical and horizontal meshes, and nine protruding portions 22, ··· disposed at positions corresponding to the 3×3 meshes 21a of the lattice frame portion 21 and protruding out of the plane of the lattice frame portion 21. Therefore, when assembling the unit block member 2, it can be assembled regardless of the orientation of the unit block member 2.

[0038] (3) Further, each of the protruding portions 22 is composed of four support legs 23 extending from near the corner portions of each cell 21a of the lattice frame portion 21, and a top surface 24 supported by the four support legs 23. Therefore, the load supported by one protruding portion 22 in the upper stage can be dispersed and supported by the four protruding portions 22 in the lower stage.

[0039] (4) Also, among the nine protruding portions 22, groove portions 25 are formed on the top surfaces 24 of the four protruding portions 22 at the centers of the four sides in a direction perpendicular to each side. Since the groove portions 25 are configured to fit the lattice frame portion 21 (near the intersections), the load can be transmitted from the upper stage to the lower stage through the vicinity of the intersections of the lattice frame portion 21. Further, by fitting into the groove portions 25 extending in two directions, the X direction and the Y direction, the unit block member 2 can be positioned without shifting in the X direction or the Y direction.

[0040] (5) Further, the four support legs 23 constituting the protruding portion 22 are formed to be inclined so as to approach each other as they move away from the lattice frame portion 21. Therefore, a large number of unit block members 2 (3, 4) can be stacked in the vertical direction for storage and transportation, and the space utilization efficiency is excellent.

[0041] (6) In addition, the half-block member 3 includes a lattice frame portion 31 formed in a lattice shape having cells 31a of 3X1.5 in the vertical direction, and three protruding portions 32, 32, 32 disposed at positions corresponding to the cells 31a of 3X1.5 in the vertical direction of the lattice frame portion 31 and protruding out of the plane of the lattice frame portion 31. Therefore, unit block members can also be arranged at the peripheral portions and the like where the basic unit block member 2 cannot be installed.

[0042] (7) In addition, the quarter-block member 4 includes a lattice frame portion 41 formed in a lattice shape having cells 41a of 1.5X1.5 in the vertical direction, and one protruding portion 42 disposed at a position corresponding to the cells 41a of 1.5X1.5 in the vertical direction of the lattice frame portion 41 and protruding out of the plane of the lattice frame portion 41. Therefore, unit block members can also be arranged at the corner portions and the like where the basic unit block member 2 cannot be installed.

[0043] (8) Further, in the rainwater storage and infiltration facility 1 formed by combining the unit block members 2 of the rainwater storage and infiltration facility of any one of (1)-(5) described above, among the nine protruding portions 22 in the lower stage, etc., the entire corner portions of the upper grid frame portion 21 are placed and fitted on the top surface 24 of the central protruding portion 22 of the whole. For this reason, one unit block member 2 in the upper stage is supported by four unit block members 2, 2, 2, 2 in the lower stage, and the load can be dispersed.

[0044] (9) Furthermore, since the half-block member 3 is further arranged at the side or corner portion of the outer peripheral edge in plan view, the unit block members can also be arranged at the peripheral portion etc. where the basic unit block member 2 cannot be installed, and the rainwater storage and infiltration facility 1 can be constructed.

[0045] (10) Similarly, since the quarter-block member 4 is further arranged at the side or corner portion of the outer peripheral edge in plan view, the unit block members can also be arranged at the corner portion etc. where the basic unit block member 2 cannot be installed.

[0046] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention.

Explanation of Reference Numerals

[0047] 1: Rainwater storage and infiltration facility 2: (Basic) Unit block member 21: Grid frame portion 21a: Mesh 21b: Fitting hole 21c: Fitting hole 21d: Fitting hole 22: Protruding portion 23: Support leg 24: Top surface 25: Groove portion 25a: Dividing tab 26: Tab 27: Circular hole 3: Half-block member (unit block member) 31: Lattice frame part 31a: Mesh 31b: Fitting hole 31c: Fitting hole 32: Protrusion 33: Support leg 34: Top surface 35: Groove part 35a: Dividing tab 35b: Dividing tab 36: Tab 38: Protruding frame part 4: Quarter-block member (unit block member) 41: Lattice frame part 41a: Mesh 41b: Fitting hole 41c: Fitting hole 42: Protrusion 43: Support leg 44: Top surface 45: Groove part 45a: Dividing tab 45b: Dividing tab 46: Tab 48: Protruding frame part 5: Top plate member 50: Body part 51b: Fitting hole 51c: Fitting hole

Claims

1. A lattice frame portion formed in a lattice shape having one or more squares; and one or more protrusions that are disposed at positions corresponding to one or more of the squares of the lattice frame portion and protrude outside the surface of the lattice frame portion, The lattice frame part of the upper stage is placed on and fitted to the protruding part of the lower stage, A lattice frame portion formed in a lattice shape having 3 vertical and 3 horizontal squares; nine protrusions arranged at positions corresponding to the 3×3 grids of the lattice frame portion and protruding out of the surface of the lattice frame portion; each of the protrusions includes four support legs extending from the vicinity of a corner of each square of the lattice frame portion and a top surface supported by the four support legs; A unit block member of a rainwater storage and infiltration facility, in which of the nine protrusions, the top surfaces of the four protrusions at the center of the four sides have grooves formed in a direction perpendicular to each side, and the grooves are configured to fit into the lattice frame portion.

2. 2. A unit block member of a rainwater storage and infiltration facility according to claim 1, wherein the four support legs constituting the protrusion are formed at an incline so as to approach each other as they move away from the lattice frame portion.

3. A lattice frame portion formed in a lattice shape having squares of 3 vertical x 1.5 horizontal, A unit block member of a rainwater storage and infiltration facility as described in claim 1, comprising three protrusions arranged at positions corresponding to the 3x1.5 squares of the lattice frame portion and protruding outside the surface of the lattice frame portion.

4. A lattice frame portion formed in a lattice shape having one or more squares; and one or more protrusions that are disposed at positions corresponding to one or more of the squares of the lattice frame portion and protrude outside the surface of the lattice frame portion, The lattice frame part of the upper stage is placed on and fitted to the protruding part of the lower stage, A lattice frame portion formed in a lattice shape having squares of 1.5 vertical x 1.5 horizontal, A unit block member of a rainwater storage and infiltration facility, comprising: one protrusion portion that is arranged at a position corresponding to the 1.5 x 1.5 squares of the lattice frame portion and protrudes outside the surface of the lattice frame portion.

5. A lattice frame portion formed in a lattice shape having one or more squares; and one or more protrusions that are disposed at positions corresponding to one or more of the squares of the lattice frame portion and protrude outside the surface of the lattice frame portion, The lattice frame part of the upper stage is placed on and fitted to the protruding part of the lower stage, A lattice frame portion formed in a lattice shape having 3 vertical and 3 horizontal squares; nine protrusions arranged at positions corresponding to the 3×3 grids of the lattice frame portion and protruding out of the surface of the lattice frame portion; Each of the protrusions is composed of four support legs extending from the vicinity of the corners of each square of the lattice frame portion and a top surface supported by the four support legs. A rainwater storage and infiltration facility that combines a plurality of unit block members of the rainwater storage and infiltration facility, A rainwater storage and infiltration facility configured so that all of the corner portions of the lattice frame portion of the upper tier are placed and fitted onto the top surface of the central protrusion of the nine protrusions in the lower tier.

6. A rainwater storage and infiltration facility as described in claim 5, further comprising a unit block member of the rainwater storage and infiltration facility as described in claim 3 arranged on an outer peripheral edge or a corner portion in a plan view.

7. A rainwater storage and infiltration facility as described in claim 5, further comprising a unit block member of the rainwater storage and infiltration facility as described in claim 4 arranged on an outer peripheral edge or a corner portion in a plan view.

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