AU2020257026A1

AU2020257026A1 - Unit block member of rainwater storage and infiltration facility, frame-shaped block unit of rainwater storage and infiltration facility, and rainwater storage and infiltration facility

Info

Publication number: AU2020257026A1
Application number: AU2020257026A
Authority: AU
Inventors: Kazuhisa Yuki
Original assignee: Tensho Electric Industries Co Ltd
Current assignee: Tensho Electric Industries Co Ltd
Priority date: 2020-06-30
Filing date: 2020-07-20
Publication date: 2022-01-20

Abstract

[Abstract] [Problem] To provide a rainwater storage and infiltration facility having a structure in which the assembly of respective constituting bodies is easy, and the strength of each configuration unit member of the constituting body is improved, and various kinds of forces to be applied to the constituting body is dispersed, so that the entire structural body is difficult to be deformed. [Solution] In the rainwater storage and infiltration facility, at the upper side of lower-side frame-shaped block units 40 arranged in the X and Y directions at an interval d therebetween corresponding to the a width size of an arm portion 13 of a cross-shaped plane portion 12 of a unit block member 10, a plurality of upper-side frame-shaped block units are arranged in the X and Y directions each at a position shifted in a diagonal line direction so as to extend over rectangular recessed portions 15 at four corner portions of four lower-side frame-shaped block units that are adjacent to one another in the diagonal line direction, and the rectangular recessed portions 15 of the lower-side and upper-side frame-shaped block units are joined to each other. [Selected Drawing] Fig. 1 51

Description

DESCRIPTION

Title of the Invention: UNIT BLOCK MEMBER OF RAINWATER STORAGE

AND INFILTRATION FACILITY, FRAME-SHAPED BLOCK UNIT OF RAINWATER STORAGE AND INFILTRATION FACILITY, AND RAINWATER STORAGE AND INFILTRATION FACILITY

Technical Field

[0001]

The present invention relates to a unit block member of

a rainwater storage and infiltration facility, a frame-shaped

block unit of the rainwater storage and infiltration facility,

and the rainwater storage and infiltration facility. The

invention specifically relates to a unit block member of a

rainwater storage and infiltration facility, a frame-shaped

block unit of the rainwater storage and infiltration facility,

and the rainwater storage and infiltration facility that can

be constructed so as to have various kinds of the overall shape

such as a rectangular shape, an L-shape, or a stepped shape

with the minimum number of components, and an assembly thereof

is also easy.

Background Art

[0002]

Rainwater storage and infiltration facilities are

generally installed in the underground of public facilities

such as roads, parks, and parking lots, and are configured by assembling a large number of unit members molded by plastic materials in the horizontal direction and the vertical direction. Conventionally, structure members having various kinds of structures that cover the surrounding of constituting bodies of the storage and infiltration facility with water-permeable andwater-impermeable sheets, store rainwater invoidsin the inside ofthe rainwater storage andinfiltration facility, and support a load in the vertical direction have been developed. Such a rainwater storage and infiltration facility having a large void ratio in a rainwater storage space is preferable because the capacitance ofrainwater to be stored becomes larger. Moreover, earth and sand and the like are accumulated in the inside of the rainwater storage and infiltration facility after a long use period, so that it is required to easily inspect the inside of the rainwater storage and infiltration facility and easily remove the accumulated earth and sand.

[00031

As such a rainwater storage and infiltration facility,

rainwater storage and infiltration facilities having a

configuration in which unit members serving as constituting

bodies of the facility are arranged by being in close contact

with each other in the horizontal direction and the vertical

direction, and the unit members are connected by joint members

have been conventionally known (for example, PTLs 1 and 2).

Moreover, as in PTL 3, a rainwater storage and infiltration

facility has been also disclosed, in which unit members are

arranged at a predetermined interval therebetween, corner

portions of four unit members adjacent to one another are

mutually connected by joint members, and ceiling parts of the

four unit members are further covered with a top plate member

to reduce the weight per unit volume, and an inspection opening

penetrating in the vertical direction is formed to facilitate

an inspection work for the rainwater storage and infiltration

facility. In addition, a rainwater storage and infiltration

facility that aims to improve a void ratio of a rainwater

storage space, and facilitates an inspection work for the

rainwater storage and infiltration facility by forming a large

number of inspection openings penetrating in the vertical

direction has been also already disclosed (PTL 4).

Citation List

Patent Literatures

[0004]

PTL 1: JP-A-10-252108

PTL 2: JP-A-2002-309658

PTL 3: JP-A-2010-48010

PTL 4: JP-A-2019-73855

Summary of Invention

Technical Problem

[00051

The rainwater storage and infiltration facilities in

PTLs 1 and 2 have the structure in which the configuration unit

members are densely arranged, and these are mutually connected

by the joint members, which results in an increase in the weight

per unit volume and reduction in the void ratio of the rainwater

storage space, and also causes a problem of the cost such as

the cost of materials. Moreover, also as for PTL 3, the joint

members are necessary for mutually connecting the adjacent

unit members, which results in an increase in the number of

components, and the volume of the rainwater storage space is

difficult to be made large due to the difficulty of further

adding a unit member on the top plate member. Although the

rainwater storage and infiltration facility in PTL 4 has an

effect in that the number of members that construct a

constituting body is small to improve the void ratio of the

rainwater storage space, and an inspection work of the facility

is facilitated, there has been a problem in that the connection

work of constituent members such as positioning of the

respective constituting bodies in an assembly of constituting

bodies, specially stacking constituting bodies in two or more

stages, is troublesome.

[00061

An object of the invention is to provide a rainwater

storage and infiltration facility that can solve the above-described problems of the rainwater storage and infiltration facilities, and has a structure in which the assembly of the respective constituting bodies is easy, the strength of each configuration unit member of the constituting body is improved, and various kinds of forces to be applied to the constituting body are dispersed, so that the entire structural body is difficult to be deformed, and a unit block member and a frame-shaped block unit included in the constituting body of the rainwater storage and infiltration facility.

[00071

Another object of the invention is to provide a rainwater

storage and infiltration facility that can be implemented by

freely combining constituentmembers of the few types such that

the overall planar shape of the facility becomes a form such

as a rectangular shape, an L-shape, or a stepped shape with

the minimum component configuration.

Solution to Problem

[0008]

With one aspect of the invention, providedis aunit block

member of a rainwater storage and infiltration facility

comprising: a quadrate plate with a cross-shaped plane portion

being formed on one of single-side surfaces; rectangular

recessed portions that are respectively formedin single-sided

surface four corner portions of the quadrate plate by being adjacent to arm portions of the cross-shaped plane portion of the quadrate plate, each of which including a through-hole in a bottom surface thereof; and hollow tubular leg portions that extend from the other single-side surface of the quadrate plate by being aligned with the through-holes in the rectangular recessed portions, which results in a four-leg block form configuration, characterized in that the rectangular recessed portionincludes recessedportion section walls that demarcate the recessed portion with respect to the cross-shaped plane portion of the quadrate plate, the bottom surface of the rectangular recessed portion is linked with an outer side portion at the corner portion of the quadrate plate, and inclined surfaces are respectively formed in a link portion between the bottom surface of the rectangular recessed portion and the outer side portion of the quadrate plate, and a link portion between the bottom surface of the rectangular recessed portion and the recessed portion section wall.

[00091

With another aspect of the invention, provided is a unit

block member of a rainwater storage and infiltration facility,

in which a rectangular plane portion and rectangular lower

surface portions on both sides of the rectangular plane portion

by being adjacent thereto are formed on one of single-side

surfaces, a through-hole is formed in each of the rectangular

lower surface portions, and a hollow tubular leg portion that is formed on the other single-side surface and is aligned with the through-hole of each of the rectangular lower surface portions is formed, which results in a two-leg block form configuration, characterized in that a side portion section wall is formed on a single side portion of each of the rectangular lower surface portions by being linked with a single side portion of the rectangular plane portion, and inclined surfaces are respectively formed in a link portion between each of section walls that demarcate the rectangular lower surface portion and a bottom surface of the rectangular lower surface portion, and a link portion between the bottom surface of the rectangular lower surface portion and a member side portion.

[0010]

Moreover, with another aspect of the invention, provided

is a unit block member of a rainwater storage and infiltration

facility comprising: a rectangular plate that includes a

through-hole in a center thereof; section walls that are formed

on two adjacent side edges on one of single-side surfaces of

the rectangular plate; and one hollow tubular leg portion that

is formed on the other single-side surface of the rectangular

plate by being aligned with the through-hole, which results

in a one-leg block form configuration, characterized in that

inclined surfaces are respectively formed in a link portion

between the one of the single-side surfaces of the rectangular plate and the section wall, and a link portion between the one of the single-side surfaces of the rectangular plate and a rectangular plate side portion.

[0011]

Moreover, with the invention, providedis a frame-shaped

block unit in a rainwater storage and infiltration facility

comprising a pair of the unit block members, characterized in

that, the hollow tubular leg portions of the pair of the unit

block members are caused to face each other in an axis line

direction thereof and leg portion tips are connected to each

other in a fitted state.

[0012]

Moreover, with the invention, provided is a rainwater

storage and infiltration facility, characterized in that, a

plurality of the frame-shapedblock units eachincluding apair

of the unit block members of the four-leg block form

configuration are installed by being arranged at a

predetermined interval therebetween in X and Y directions.

[0013]

With still another aspect of the invention, provided is

a rainwater storage and infiltration facility, characterized

in that, at an upper side of the lower-side frame-shaped block

units arranged in the X and Y directions at an interval

therebetween corresponding to a width size of the arm portion

of the cross-shaped plane portion of the unit block member by the four-leg block form configuration, a plurality of the upper-side frame-shaped block units are arranged in the X and

Y directions each at a position shifted in a diagonal line

direction so as to extend over the rectangular recessed

portions at the four corner portions of the four lower-side

frame-shaped block units that are adjacent to one another in

the diagonal line direction, and the rectangular recessed

portions of the lower-side and upper-side frame-shaped block

units are joined to each other.

[0014]

With still another aspect of the invention, provided is

the rainwater storage and infiltration facility,

characterized in that, the lower-side and upper-side

frame-shaped block units that are arranged in the X and Y

directions at the interval therebetween corresponding to the

width size of the arm portion of the cross-shaped plane portion

of the unit block member by the four-leg block form

configuration are vertically stacked in a plurality of stages

such that the upper-side frame-shaped block units are

respectively shifted in the diagonal line direction with

respect to the lower-side frame-shaped block units.

[0015]

With still another aspect of the invention, provided is

the rainwater storage and infiltration facility,

characterized in that a plurality of the frame-shaped block units each including a pair of the unit block members by the four-leg block form configuration are installed in the X and

Y directions by being arranged at the predetermined interval

therebetween, and a side portion frame-shaped block unit

including a pair of the unit block members by the two-leg block

form configuration is provided on an outer side portion of an

entire constituting body thereof.

[0016]

With still another aspect of the invention, provided is

the rainwater storage and infiltration facility,

characterized in that a plurality of the frame-shaped block

units each including a pair of the unit block members by the

four-leg block form configuration are installed in the X and

Y directions by being arranged at a predetermined interval

therebetween, and a corner portion frame-shaped block unit

including a pair of the unit block members by the one-leg block

formconfigurationis providedon acornerportion ofthe entire

constituting body.

[0017]

With still another aspect of the invention, provided is

a rainwater storage and infiltration facility, characterized

in that a plurality of the frame-shaped block units each

including apair of the unit block members of the four-leg block

form configuration are arranged in an L-shape as a whole at

a predetermined interval therebetween, and the side portion frame-shaped block unit by the two-leg block form configuration and the frame-shaped block unit by the one-leg block form configuration are provided in a side portion of an entire constituting body thereof.

[00181

With still another aspect of the invention, provided is

a rainwater storage and infiltration facility, characterized

in that the frame-shaped block units each including a pair of

the unitblock members by the four-legblock formconfiguration

are arranged in the X and Y directions at a predetermined

interval therebetween, a form in which the frame-shaped block

units in one corner portion and in a vicinity thereof of an

entire constituting body are removed is employed, the side

portion frame-shaped block unit by the two-leg block form

configuration and the frame-shaped block unit by the one-leg

block form configuration are provided in a side portion of the

entire constituting body, and the entire constituting body is

a block unit arrangement form of a stepped shape.

[0019]

In addition, provided is a rainwater storage and

infiltration facility, characterized in that a surface of the

frame-shaped block unit that is installed at the highest stage

is shielded by an immersible shielding body.

Advantageous Effects of Invention

[0020]

In the rainwater storage and infiltration facility by

the invention, it is possible to implement the structure in

which when constituting bodies are vertically stacked to have

a multistage form, the assembly of the respective constituting

bodies is easy, and the strength of each configuration unit

member of the constituting body is improved, and various kinds

of forces to be applied to the constituting body is dispersed,

so that the entire structuralbody is difficult to be deformed.

Moreover, with the invention, it is possible to implement the

rainwater storage and infiltration facility of the overall

planar shape of the facility such as a rectangular shape, an

L-shape, or a stepped shape with the minimum component

configuration by freely combining constituent members of the

few types, and arbitrarily select an installation shape each

time in accordance with a place where the rainwater storage

and infiltration facility is installed and a status of the

surrounding of the place, an installation area, and the like.

Brief Description of the Drawings

[00211

[Fig. 1] Fig. 1 is a perspective view of a unit block

member of a four-leg form according to an embodiment of the

invention, seen from a rectangular recessed portion side.

[Fig. 2] Fig. 2 is a perspective view of the unit

block member of the four-leg form according to the embodiment of the invention, seen from a leg portion tip side.

[Fig. 3] Fig. 3 is a perspective view of a unit block

member of a two-leg form according to the embodiment of the

invention, seen from a rectangular recessed portion side.

[Fig. 4] Fig. 4 is a perspective view of the unit

block member of the two-leg form according to the embodiment

of the invention, seen from a leg portion tip side.

[Fig. 5] Fig. 5 is a perspective view of a unit block

member of a one-leg form according to the embodiment of the

invention, seen from a rectangular plate through-hole side.

[Fig. 6] Fig. 6 depicts perspective views of the unit

block members of the one-leg form according to the embodiment

of the invention, seen from a leg portion tip side: Fig. 6(a)

is the perspective view of the one-leg unit block member in

a form where a recessed fitting portion is formed in the leg

portion tip; and Fig. 6(b) is the perspective view of the

one-leg unit block member in a form where a protruding fitting

portion is formed on the leg portion tip.

[Fig. 7] Fig. 7 is a perspective view of a unit block

member of a four-leg form according to another embodiment of

the invention, seen from a rectangular recessed portion side.

[Fig. 8] Fig. 8 is a perspective view of the unit

block member of the four-leg form according to another

embodiment of the invention, seen from a leg portion tip side.

[Fig. 9] Fig. 9 is a perspective view of a unit block member of a two-leg form according to another embodiment of the invention, seen from a rectangular recessed portion side.

[Fig. 10] Fig. 10 is a perspective view of the unit

block member of the two-leg form according to another

embodiment of the invention, seen from a leg portion tip side.

[Fig. 11] Fig. 11is a perspective view of a unit block

member of a one-leg form according to another embodiment of

the invention, seen from a rectangular plate through-hole

side.

[Fig. 12] Fig. 12 depicts perspective views of the

unit block members of the one-leg form according to another

embodiment of the invention, seen from a leg portion tip side:

Fig. 12 (a) is the perspective view of the one-leg unit block

member in a form where a recessed fitting portion is formed

in the leg portion tip; and Fig. 12 (b) is the perspective view

of the one-leg unit block member in a form where a protruding

fitting portion is formed on the leg portion tip.

[Fig. 13] Fig. 13 is a perspective view of a

frame-shaped block unit of a four-pedestal form by the unit

block members illustrated in Fig. 1, in the embodiment of the

invention.

[Fig. 14] Fig. 14 is a perspective view of a

frame-shaped block unit of a two-pedestal form according to

the embodiment of the invention.

[Fig. 15] Fig. 15 is a perspective view of a frame-shaped block unit of a one-pedestal form according to the embodiment of the invention.

[Fig. 16] Fig. 16 is a perspective view of a rainwater

storage and infiltration facility in which a plurality of the

frame-shaped block units are arranged in X and Y directions

to obtain a constituting body of a one-stage form in the

embodiment.

[Fig. 17] Fig. 17 is a perspective view of a base unit

constituting body that is arranged on a foundation floor below

the constitutingbody of the one-stage formillustrated in Fig.

16.

[Fig. 18] Fig. 18 is a perspective view of a rainwater

storage and infiltration facility as a block unit constituting

body of a two-stage setting form according to the embodiment

of the invention.

[Fig. 19] Fig. 19 is a perspective view illustrating

lid members covering an uppermost surface of the block unit

constituting body of the one-stage form in Fig. 16.

[Fig. 20] Fig. 20 is a perspective view of a rainwater

storage and infiltration facility constructed as a block unit

constituting body of a three-stage setting form according to

the embodiment of the invention.

[Fig. 21] Fig. 21 is a schematic plan view

illustrating an arrangement relation between lower-side units

and upper-side units in block unit constituting bodies that are stacked in a plurality of stages.

[Fig. 22] Fig. 22 is a view for explaining an inclined

surface effect of the rectangular recessed portion when an

upper-side frame-shaped block unit is installed on a

lower-side frame-shaped block unit.

[Fig. 23] Fig. 23 is a perspective view of a rainwater

storage and infiltration facility in which a constituting body

including frame-shaped block units is configured as an L-shape

arrangement form.

[Fig. 24] Fig. 24 is a perspective view of a rainwater

storage and infiltration facility in which a constituting body

including frame-shaped block units is configured as a stepped

shaped block unit arrangement form.

Reference Signs List

[0022]

, 101 unit block member of four-leg form

11 quadrate plate

12 cross-shaped plane portion

13 arm portion

14 through-hole

rectangular recessed portion

16 hollow tubular leg portion

19, 20, 29, 30 inclined surface

21, 211 unit block member of two-leg form

22 rectangular plane portion

23 lower surface portion

31, 311 unit block member of one-leg form

frame-shaped block unit of four-pedestal form

41 frame-shaped block unit of two-pedestal form

42 block unit of one-pedestal form

Description of Embodiments

[0023]

Next, various kinds of embodiments of the invention will

be described with reference to the drawings. A rainwater

storage and infiltration facility according to the invention

includes a plurality of arrangement constituting bodies of

frame-shaped block units, and the frame-shaped block unit

includes a pair of unit block members. Firstly, an embodiment

of the unitblockmember willbe described. Aunitblockmember

illustrated in Figs. 1 and 2 is configured as a four-leg

block form. Note that, Fig. 2 illustrates a rear surface side

of the unit block member in a state of Fig. 1. With reference

to Fig. 1, the unit block member 10 includes: a quadrate plate

11 with a cross-shaped plane portion 12 being formed entirely

on one of single-side surfaces thereof; rectangular recessed

portions 15 that are respectively formed on single-sided

surface four corner portions of the quadrate plate 11 by being

adjacent to fourprojecting armportions 13 of the cross-shaped plane portion 12 of the quadrate plate 11, each of which including a through-hole 14 on a bottom surface center thereof; and four hollow tubular leg portions 16 that extend from the other single-side surface (rear surface of the quadrate plate when being seen in the illustrated state) of the quadrate plate

11 by being respectively aligned with the through-holes 14 in

the rectangular recessed portions 15.

[0024]

Each rectangular recessed portion 15 includes two

recessed portion section walls 18 that demarcate the recessed

portion 15 with respect to the cross-shaped plane portion 12

of the quadrate plate 11, and the bottom surface of the

rectangular recessed portion 15 is linked with an outer side

portion 11a in the corner portion of the quadrate plate 11.

Note that, the recessed portion section walls 18

simultaneously demarcate each arm portion 13 of the

cross-shaped plane portion 12. Further, inclined surfaces 19

and 20 are respectively formed in a link portion (link ridge

portion) between the bottom surface of the rectangular

recessed portion 15 and the outer side portion 11a of the

quadrate plate 11, and in a link portion (an inner edge of the

rectangular bottomsurface thatis linkedwith the sectionwall

18) between the bottom surface of the rectangular recessed

portion 15 and the recessed portion section wall 18. A

plurality of water passage holes are provided in the cross-shaped plane portion 12, however, illustration thereof is omitted for clear illustration. As illustrated in Fig. 2, the hollow leg portion 16 has a closed-bottom structure with aplurality ofwater passage holes (notillustrated). Further, in the four leg portions 16 that extend from the quadrate plate rear surface, protruding fitting portions 71 are respectively formed on tips of two leg portions that are present in the diagonal line direction, and recessed fitting portions 72 are respectively formed on tips of the other two leg portions. The recessed and protruding fitting portions 72 and 71 will be described later in relation to the frame-shaped block unit.

Each of the arm portions 13 of the cross-shaped plane portion

12 has a same width size d, which will be further described

later in relation to the arrangement and the stacking of the

frame-shaped block units.

[0025]

In bottom portions of the quadrate plate 11 and the leg

portions 16, a plurality of water passage holes (not

illustrated) having a circular shape, a rectangular shape, or

another shape that let rainwater escape are formed so as to

pass through to the rear surfaces. With reference to Fig. 1,

two engagement holes 76 and two engagement protrusions 77 are

formedin the bottomsurface ofeachof the rectangular recessed

portions 15. In this embodiment, as illustrated, the

engagement hole 76 is provided in a recessed portion bottom surface that is adjacent to the recessed portion section wall

18 of the rectangular recessed portions 15, and the engagement

protrusion 77 is provided being adjacent to the outer side

portion 11a of the quadrate plate 11. In the rainwater storage

and infiltration facility of a multistage form, the engagement

hole 76 of the lower-side unit block member 10 engages with

the engagement protrusion 77 of the upper-side unit block

member 10, and the engagement protrusion 77 of the lower-side

one engages with the engagement hole 76 of the upper-side one.

A specific form thereof will be further described later in

relation to Figs. 18, 20, and 21.

[0026]

A unit block member 21 in the embodiment illustrated in

Figs. 3 and 4 is configured as a two-leg block form, and is

herein referred to as a side portion unit block member in view

of a use location thereof. Note that, Fig. 4 illustrates a

rear surface side of the unit block member in a state of Fig.

3. With reference to Fig. 3, a rectangular plane portion 22

is formed on the center of one of single-side surfaces of a

rectangular plate, and rectangular lower surface portions 23

having aheight lower than that of the rectangular plane portion

22 are formed on both sides of the plane portion 22 by being

adjacent to the plane portion 22. Moreover, through-holes 24

are respectively formed in the rectangular lower surface

portions 23, and a pair of hollow tubular leg portions 25 that are respectively aligned with the through-holes 24 of the rectangular lower surface portions 23 are further formed on the other single-side surface (rear surface of the rectangular plate). Also in the unit block member 21 of the two-leg block form, inclined surfaces 29 and 30 are respectively formed in a link portion between section walls 26 that demarcate the rectangular lower surface portion 23 and a bottom surface 27 of the rectangular lower surface portion 23, and a link portion between the bottom surface 27 of the rectangular lower surface portion 23 and a member side portion 28 (side portion of the rectangular plate). A plurality of water passage holes are provided in the rectangular plane portion 22, however, illustration thereof is omitted for clear illustration. Note that, also in the unit block member 21 of the two-leg block form, the rectangular plane portion 22 has the same width size d as the unit block member of the four-leg type in Fig. 1.

[00271

In bottom portions of the rectangular plane portion 22,

the rectangular lower surface portions 23, and the legportions

, a plurality of water passage holes (not illustrated) that

let rainwater escape are formed so as to pass through to the

rear surfaces. Further, in the two leg portions 25 that extend

from the rear surface of the rectangular plate, a protruding

fitting portion 83 is formed on a tip of one of the leg portions

, and a recessed fitting portion 84 is formed on a tip of the other leg portion. The recessed and protruding fitting portions 84 and 83 will be described later in relation to the frame-shaped block unit of the two-leg form. With reference to Fig. 3, two engagement holes 80 and two engagement protrusions 81 are formed on the bottom surface 27 of each of the rectangular lower surface portions 23. In this embodiment, as illustrated, the engagement hole 80 is providedin the bottom surface 27 that is adjacent to the section wall 26 of the rectangular lower surface portion 23, and the engagement protrusion 81 is provided being adjacent to the member side portion 28 of the rectangular plate. In the rainwater storage and infiltration facility of a multistage form, similar to the unit block member 10 of the four-leg type in Fig. 1, the engagement hole 80 of the lower-side unit block member 21 engages with the engagement protrusion 81 of the upper-side unit block member 21, and the engagement protrusion 81 of the lower-side one engages with the engagement hole 80 of the upper-side one.

[0 028]

A unit block member 31(a) in the embodiment illustrated

in Fig. 5 is an example of a single leg portion in a

configuration of a one-leg block form. The unit block member

31(a) includes a rectangular plate 33 having a through-hole

32 in the center thereof, section walls 35 that are formed at

two side edges on one single-side surface 34 of the rectangular plate 33, and one hollow tubular leg portion 39 that is formed on the other single-side surface of the rectangular plate 33 by being aligned with the through-hole 32. The one-leg unit block member 31 is mainly installed in a corner portion of the facility constituting body in many cases, and is thus referred to as a corner portion unit block member. Also in the unit block member 31 of the one-leg form, inclined surfaces 37 and

38 are respectively formed in a link portion between one

single-side surface 34 of the rectangular plate 33 and the

section wall 35, and a link portion between the one single-side

surface 34 of the rectangular plate 33 and a rectangular plate

side portion 36. Note that, a unit block member 31(b) is

different from the block member(a) only in the configuration

of a rear surface side thereof, and the configuration of a

surface side thereof is simply similar to that of the block

member(a), so that an explanation thereof is omitted. Fig.

6(a) illustrates a legportion structure in one embodiment seen

from the rear surface side of the unit block member 31(a) of

the one-leg form in a state of Fig. 5. Moreover, Fig. 6(b)

illustrates a leg portion structure in another embodiment seen

from the rear surface side of the unit block member 31 (b) in

the state of Fig. 5. In Figs. 6(a) and (b), only the tip

structure of the leg portion 39 is different, and the other

structures are the same. Moreover, in a frame-shaped block

unit of the one-leg form, which is described later, two types of unit block members in Figs. 12 (a) and (b) serving as a pair form the frame-shaped block unit. With reference to Fig. 5, in the one single-side surface 34 of the rectangular plate 33 and the inclined surfaces 37 and 38 of each of the unit block members 31 (a) and (b) of the one-leg form, a plurality of water passage holes (not illustrated) that pass through to the rear surface (Fig. 6) are formed. Moreover, on the single-side surface 34 of the rectangular plate 33, two engagement holes

91 are respectively formed on positions that are adjacent to

the section walls 35 and two engagement protrusions 92 are

formed on positions that are adjacent to the rectangular plate

side portion 36. In a frame-shaped block unit constituting

body of a one-pedestal shape being stacked in a plurality of

stages, the engagement holes 91and the engagement protrusions

92 oftheunitblockmemberin the lower-side frame-shapedblock

unit respectively engage with the engagement protrusions 92

and the engagement holes 91 of the unit block member in the

upper-side frame-shaped block unit. The hollow leg portion

39 has a closed-bottom structure with a plurality of water

passage holes (not illustrated). Further, a protruding

fitting portion 95 is formed on a tip of one leg portion 39

that extends from the rear surface of the rectangular plate

33in the unit block member 311(b) of the one-leg formaccording

to one of the embodiments (Fig. 6(b)), and a recessed fitting

portion 94 is formed in a tip of the leg portion 39 that extends from the rear surface of the rectangular plate 33 in the unit block member 31(a) of the one-leg form according to the other embodiment (Fig. 6(a)). The unit block member 31 with the leg portion of the recessed fitting portion 94 and the unit block member 31with the legportion of the protruding fittingportion are fitted with each other in the recessed and protruding fitting portions 94 and 93, thereby forming a frame-shaped block unit of one-pedestal form illustrated in Fig. 15.

[0029]

Next, with Figs. 7 to 12, as another embodiment of the

invention, a unit block member in which a main body and water

passage holes are formed in a grid-like rib form will be

described.

[0030]

The rainwater storage and infiltration facility

according to the invention includes a plurality of arrangement

constituting bodies of frame-shaped block units, and the

frame-shaped block unit includes a pair of unit block members.

Firstly, the embodiment of the unit block member will be

described. A unit block member 101 illustrated in Figs. 7 and

8 is configured as a four-leg block form. Note that, Fig. 8

illustrates a rear surface side of the unit block member in

Fig. 7. With reference to Fig. 7, the unit block member 101

includes: a quadrate plate 11with a cross-shaped water passage

portion 12 being formed entirely on one of single-side surfaces thereof; rectangular recessed portions 15 that are respectively formed on single-sided surface four corner portions of the quadrate plate 11 by being adjacent to four projecting arm portions 13 of the cross-shaped water passage portion 12 of the quadrate plate 11, each of which including a through-hole 14 on a bottom surface center thereof; and four hollow tubular leg portions 16 that extend from the other single-side surface (rear surface of the quadrate plate when being seen in the illustrated state) of the quadrate plate 11 by being respectively aligned with the through-holes 14 of the rectangular recessed portions 15.

[0031]

Each rectangular recessed portion 15 includes two

recessed portion section walls 18 that demarcate the recessed

portion 15 with respect to the cross-shaped water passage

portion 12 of the quadrate plate 11, and the bottom surface

of the rectangular recessed portion 15 is linked with an outer

side portion 11a in each corner portion of the quadrate plate

11. Note that, the recessed portion section walls 18

simultaneously demarcate each arm portion 13 of the

cross-shaped water passage portion 12. Further, inclined

surfaces 19 and 20 are respectively formed in a link portion

(link ridge portion) between the bottom surface of each

rectangular recessed portion 15 and the outer side portion 11a

of the quadrate plate 11, and in a link portion (an inner edge of the rectangular bottom surface that is linked with the section wall 18) between the bottom surface of the rectangular recessed portion 15 and the recessed portion section wall 18.

As illustrated in Fig. 2, the hollow leg portion 16 has a

closed-bottom structure with a large number of water passage

holes 70. Further, in the four leg portions 16 that extend

from the quadrate plate rear surface, protruding fitting

portions 71 are respectively formed on tips of two leg portions

that are present in the diagonal line direction, and recessed

fittingportions 72 are respectively formedon tips ofthe other

two leg portions. The recessed and protruding fitting

portions 72 and 71 will be described later in relation to the

frame-shaped block unit. Each of the arm portions 13 of the

cross-shaped water passage portion 12 has a same width size

d, which will be further described later in relation to the

arrangement and the stacking of the frame-shaped block units.

[0032]

In the cross-shaped water passage portion 12 of the

quadrate plate 11, a plurality of water passage holes 73 are

formed so as to pass through to a rear surface thereof. The

water passage holes 73 are formed in a grid-like rib form so

as not to impair the strength while aiming reduction in overall

weight. Moreover, also in the bottom surface of each

rectangular recessed portion 15, a plurality of small-diameter

water passage holes 74 are formed. With reference to Fig. 7, two engagement holes 76 and two engagement protrusions 77 are formedin the bottomsurface ofeachof the rectangular recessed portions 15. In this embodiment, as illustrated, the engagement hole 76 is provided in a recessed portion bottom surface that is adjacent to the recessed portion section wall

18 of the rectangular recessed portions 15, and the engagement

protrusion 77 is provided being adjacent to the outer side

portion 11a of the quadrate plate 11. In the rainwater storage

and infiltration facility of a multistage form in which a

plurality of frame-shaped block units (which is described

later) are vertically stacked on each other, the engagement

hole 76 of the lower-side unit block member 101 engages with

the engagement protrusion 77 of the upper-side unit block

member 101, and the engagement protrusion 77 of the lower-side

one engages with the engagement hole 76 of the upper-side one.

A specific form in which the frame-shaped block units are

vertically stacked on each other will be further described

later in relation to Figs. 18, 20, and 21.

[00331

A unit block member 211 in the embodiment illustrated

in Figs. 9 and 10 is configured as a two-leg block form, and

is herein referred to as a side portion unit block member in

view ofause location thereof. Note that, Fig.10 illustrates

a rear surface side of the unit block member 211 in Fig. 9.

With reference to Fig. 9, a rectangular water passage portion

22 is formed on the center of one of single-side surfaces of

a rectangular plate, and rectangular lower surface portions

23 having a height lower than that of the rectangular water

passage portion 22 are formed on both sides of the rectangular

water passage portion 22 by being adjacent to the rectangular

water passage portion 22. Moreover, through-holes 24 are

respectively formed in the rectangular lower surface portions

23, and a pair of hollow tubular leg portions 25 that are

respectively aligned with the through-holes 24 of the

rectangular lower surface portions 23 are further formed on

the other single-side surface (rear surface of the rectangular

plate). Also in the unit block member 211 of the two-leg block

form, inclined surfaces 29 and 30 are respectively formed in

a link portion between section walls 26 that demarcate the

rectangular lower surface portion 23 and a bottom surface 27

of the rectangular lower surface portion 23, and a link portion

between the bottom surface 27 of the rectangular lower surface

portion 23 and a member side portion 28 (side portion of the

rectangular plate). Note that, also in the unit block member

211 of the two-leg block form, the rectangular water passage

portion 22 has the same width size as the unit block member

of the four-leg type illustrated in Fig. 7.

[0034]

As illustrated in Fig. 10, each hollow leg portion 25

has a closed-bottom structure with a large number of water passage holes 75. Further, in the two leg portions 25 that extend from the rear surface of the rectangular plate, a protruding fitting portion 83 is formed on a tip of one of the leg portions 25, and a recessed fitting portion 84 is formed on a tip of the other leg portion. The recessed and protruding fitting portions 84 and 83 will be described later in relation to the frame-shaped block unit of the two-leg form. Further, as illustrated in Fig. 9, in the rectangular water passage portion 22 of the rectangular plate, a plurality of water passage holes 78 are formed so as to pass through to a rear surface thereof. The water passage holes 78 are formed in a grid-like rib form so as not toimpair the strengthwhile aiming reduction in overall weight. Moreover, also in each rectangular lower surface portion 23, a plurality of small-diameter water passage holes 79 are formed. With reference to Fig. 9, two engagement holes 80 and two engagement protrusions 81 are formed on the bottom surface 27 of each of the rectangular lower surface portions 23. In this embodiment, as illustrated, the engagement hole 80 is providedin the bottom surface 27 that is adjacent to the section wall 26 of the rectangular lower surface portion 23, and the engagement protrusion 81 is provided being adjacent to the member side portion 28 of the rectangular plate. In the rainwater storage and infiltration facility of a multistage form, similar to the unit block member 101 of the four-leg type illustrated in Fig.

7, the engagement hole 80 of the lower-side unit block member

211engages with the engagement protrusion 81of the upper-side

unit block member 211, and the engagement protrusion 81 of the

lower-side one engages with the engagement hole 80 of the

upper-side one.

[0 0 351

Unit block members 311 (a) and (b) in the embodiment

illustrated in Fig. 11 is an example of a single leg portion

in a configuration of a one-leg block form. The unit block

member 311(a) includes a rectangular plate 33 having a

through-hole 32 in the center thereof, a section walls 35 that

are formed at two side edges on one single-side surface 34 of

the rectangular plate 33, and one hollow tubular leg portion

39 that is formed on the other single-side surface of the

rectangular plate 33 by being aligned with the through-hole

32. The one-leg unit block member 31 is mainly installed in

acorner portion of the facility constitutingbodyinmany cases,

and is thus referred to as a corner portion unit block member.

Also in the unit block member 31 of the one-leg form, inclined

surfaces 37 and 38 are respectively formed in a link portion

between the one single-side surface 34 of the rectangular plate

33 and the section wall 35, and a link portion between the one

single-side surface 34 of the rectangular plate 33 and a

rectangular plate side portion 36. Note that, the

configuration of the surface side of the unit block member

311 (b) is similar to the configuration of the unit block member

311(a), so that an explanation thereof is omitted.

[00361

Fig. 12 (a) illustrates a leg portion in one embodiment

seen from a rear surface side of the unit block member 311(a)

of the one-leg form structure in a state of Fig. 11. Moreover,

Fig. 12 (b) illustrates a leg portion in another embodiment seen

from a rear surface side of the unit block member 311(b) in

the state of Fig. 11. In Figs. 12(a) and (b), only the tip

structure of the leg portion 39 is different, and the other

structures are the same. Moreover, in a frame-shaped block

unit of a one-leg form, which is described later, two types

of unit block members in Figs. 12 (a) and (b) serving as a pair

form the frame-shaped block unit. With reference to Fig. 11,

in the one single-side surface 34 of the rectangular plate 33

and the inclined surfaces 37 and 38 of each of the unit block

members 311(a) and (b) of the one-leg form, a plurality of

small-diameter water passage holes that pass through to the

rear surface (Fig. 12) are formed. Moreover, on the

single-side surface 34 of the rectangular plate 33, two

engagement holes 91 are respectively formed on positions that

are adjacent to the section walls 35 and two engagement

protrusions 92 are formed on positions that are adjacent to

the rectangularplate side portion 36. Ina frame-shapedblock

unit constituting body of a one-pedestal shape being stacked in a plurality of stages, the engagement holes 91 and the engagement protrusions 92 of the unit block member in the lower-side frame-shaped block unit respectively engage with the engagement protrusions 92 and the engagement holes 91 of the unitblock memberin the upper-side frame-shapedblockunit.

The hollow leg portion 39 has a closed-bottom structure with

a large number of water passage holes 93. Further, a

protruding fitting portion 95 is formed on a tip of one leg

portion 39 thatextends fromthe rear surface ofthe rectangular

plate 33 in the unit block member 311 (b) of the one-leg form

according to one of the embodiments (Fig. 12 (b) ) , and a recessed

fitting portion 94 is formed in a tip of one leg portion 39

that extends from the rear surface of the rectangular plate

33in the unit block member 311(a) of the one-leg formaccording

to the other embodiment (Fig. 12 (a)). The unit block member

311 with the leg portion of the recessed fitting portion 94

and the unit block member 311 with the leg portion of the

protruding fitting portion 95 are fitted with each other in

the recessed andprotruding fittingportions 94 and 95, thereby

forming a frame-shaped block unit of one-pedestal form

illustrated in Fig. 15.

[00371

Fig.13 is aperspective viewillustrating a frame-shaped

block unit 40 according to the embodiment of the invention.

The frame-shaped block unit 40 in the embodiment has a configuration in which the four-leg unit block members 10 illustrated in Figs. 1 and 2 are caused to vertically face and connected to each other. A pair of the unit block members 10 having the same shape are arranged such that the hollow tubular leg portions 16 of the both respectively face each other in the axis line direction, and the recessed and protruding portions formed on the tip surfaces of the both hollow tubular leg portions 16 are mutually fitted and connected, so that the frame-shaped block unit 40 according to the invention is configured. In other words, such a structure is employed in which rear surfaces lb of the quadrate plates 11 of the pair of the unit block members 10 are caused to face each other, and four pedestals each obtained by joining the leg portions

16 connect therebetween.

[00381

In addition to the frame-shaped block unit 40 of the

four-pedestal form, in the embodiment of the invention, a

frame-shaped block unit (side portion frame-shaped block unit)

41 of a two-pedestal form in which a pair of the unit block

members (side portion unit block members) 21 of the two-leg

block form illustrated in Figs. 3 and 4 are connected to each

other in such a manner that the hollow tubular leg portions

24 are caused to face each other is obtained (Fig. 14).

Moreover, as another embodiment, a frame-shaped block unit

(corner portion frame-shaped block unit) 42 of the one-pedestal form in which the unit block members (corner portion unit block members) 31 of the one-leg form illustrated in Figs. 5, and 6 (a) and 6 (b) are used as a pair, and the hollow tubular leg portions 39 thereof are caused to mutually face and connected to each other is obtained (Fig. 15).

[00391

The rainwater storage and infiltration facility

according to the embodiment of the invention has such a

structure that a plurality of the frame-shaped block units

including the pairs of the unit block members of the four-leg

block form configuration are mutually arranged at a

predetermined interval therebetween in the X and Y directions

and installed in the earth, and entire top surfaces thereof

are shielded by a lid plate having a large number of

through-holes and an immersible shielding body.

[0040]

Fig. 16 illustrates a configuration in which a plurality

of the frame-shaped block units 40 of the four-pedestal form

are mutually arranged at apredeterminedinterval therebetween

in the X and Y directions and embedded in the cover soil, the

side portion frame-shaped block units 41 of the two-pedestal

form are arranged at two side portions of the entire

constituting body, and the corner portion frame-shaped block

unit 42 of the one-pedestalformis arranged at a corner portion

of the constituting body. The illustrated example is an example of a constituting body of a one-stage configuration in which the frame-shaped block units are arranged in the X and Y directions, however, as is described later, a configuration in which the frame-shaped block units are vertically stacked in a plurality of stages can secure more rainwater storage spaces. When a constituting body is configured as an infiltration type, immersible lids are spread on a top surface of the constituting body, a permeable sheet is further covered thereon, and a bottom portion and side portions of the constituting body are covered with an adequate permeable sheet, so that it is possible to immerse rainwater into the constituting body of the frame-shaped block units while preventing the inflow of earth and sand. Moreover, when a constituting body is configured as a rainwater storage type, the configuration in which side portions and a bottom portion of the constituting body are covered with a protection sheet or an impermeable sheet is employed. Fig. 17 illustrates a base block constitutingbody 47 thatis arranged on a foundation floor below the constituting body of the one-stage form illustrated in Fig. 16. The top surface of the base block constituting body 47 is equivalent to the shapes of the unit block members 10, 21, and 31 illustrated in Figs. 1, 3, and

, however, no pedestal that extends from the lower surface

is present.

[0041]

Next, as illustrated in Figs. 18 and 20, a rainwater

storage and infiltration facility having a configuration in

which constituting bodies including frame-shaped block units

that are arranged in the X and Y directions are vertically

stacked in a plurality of stages will be described. Fig. 18

illustrates an example of a rainwater storage and infiltration

facility 50 of a two-stage configuration, and a three-stage

or four to five-stage configuration may be employed. Fig. 20

illustrates a rainwater storage and infiltration facility 58

when a three-stage configuration is employed. Lid members 55,

56, and 57 as illustrated in Fig. 19 are provided to

frame-shaped block units 52 and 59 at the highest stage. Note

that, such lid members each have a top surface on which a

plurality of small water passage holes (not illustrated) are

formed. Moreover, also in a cross-shaped plane portion of the

frame-shaped block unit, a large number of through-holes are

formed. As a specificexample, the cross-shaped plane portion

is formed with grid-like through-hole members in consideration

of the strength.

[0042]

Fig.21is apartialplanview schematicallyillustrating

an arrangement relation between frame-shaped block units 51

at a lower side and the frame-shaped block units 52 that are

installed at an upper side thereof. Note that, for clear

illustration, the frame-shapedblock units 51at the lower side

(the first stage) are illustrated by the solid line, and the

frame-shaped block units 52 at the upper side thereof (the

second stage) are illustrated by the virtual line. Firstly,

at the upper side of the lower-side frame-shaped block units

51 arranged in the X and Y directions at an interval d (Fig.

) therebetween corresponding to the width size d of the arm

portion of the cross-shaped plane portion of the unit block

member by the four-leg block form configuration, a plurality

of the upper-side frame-shaped block units 52 are arranged in

the X and Y directions eachat aposition shiftedin the diagonal

line direction so as to extend over rectangular recessed

portions at four corner portions of the four lower-side

frame-shaped block units 51 that are adjacent to one another

in the diagonal line direction, and the rectangular recessed

portions of the lower-side and upper-side frame-shaped block

units 51 and 52 are joined to each other. Note that,

frame-shaped block units (not illustrated in Fig. 21) at the

third stage that are arranged on the frame-shaped block units

at the second stage that are illustrated by the virtual line

are arranged to the same positions corresponding to those of

the frame-shaped block units 51 at the first stage by the solid

line. The frame-shaped block unit 51illustrated by the solid

line at the first stage and the frame-shaped block unit 52 at

the second stage illustratedby the virtualline naturallyhave

the same shape and the same size. Moreover, so as to fill gaps in the side portions and gaps in the corner portions of the constituting bodies because the upper and lower frame-shaped block units are arranged with such a positional relationship shifted in the diagonal line direction, side portion frame-shaped block units 53 of the two-pedestal configuration and a corner portion frame-shaped block unit 54 of the one-pedestal configuration are arranged in side portions of the constituting body (Fig. 18).

[0043]

When a rainwater storage and infiltration facility of

a two-stage or multistage form is constructed by vertically

assembling the frame-shaped block units, the rectangular

recessed portions of the quadrate plates of the upper and lower

frame-shaped block units are required to be closely engaged

with each other. However, engaging the rectangular recessed

portions with each other while accurately positioning a large

number of the upper-side frame-shaped block units one by one

visually with respect to the lower-side frame-shaped block

units is a work that needs large efforts and time. With this

regard, in the invention, the inclined surface is formed in

the link portion between the bottom surface of the rectangular

recessed portion and the quadrate plate outer side portion,

and the recessed portion bottom surface is not directly linked

with the vertical recessed portion section wall but the

inclined surface is formed between the recessed portion bottom surface and the vertical section wall, so that it is possible to smoothly engage the upper and lower rectangular recessed portions with each other without performing the precise positioning work of the upper-side frame-shaped block unit.

[0044]

A further specific explanation is made with reference

to Fig. 22, an upper-side frame-shaped block unit 61is lowered

from the upper side with respect to a lower-side frame-shaped

block unit 60 arranged at a fixed position, an arm portion 62

of a cross-shaped plane portion thereof is inserted into a gap

A part between the adjacent two lower-side frame-shaped block

units 60, and awork to engage a lower-side rectangular recessed

portion 63 with an upper-side rectangular recessed portion 64

is started. In this process, even when a slight misalignment

S of the upper-side frame-shaped block unit 61 with respect

to the lower-side frame-shaped block unit 60 is present, a

corner portion 65 of the cross-shaped plane portion of the

lower-side frame-shaped block unit 60 abuts on an inclined

surface 66 of the rectangular recessed portion of the

upper-side frame-shaped block unit 61, the oblique surface

effect causes the upper-side frame-shapedblock unit 61tomove

in an arrow F direction, so that the positioning is

automatically made to engage the upper and lower rectangular

recessed portions 64 and 63 with each other. In this state,

in addition to the contact between the quadrate plate outer side portion and the vertical section wall of the recessed portion, the inclined surfaces abut on each other to increase the strength of the assembly structural body and to generate the dispersion of power, so that the deformation of the entire structural object and a partial damage can be prevented.

[0045]

In the abovementioned embodiment, the frame-shaped

block units are arranged in the X and Y directions to obtain

the rainwater storage and infiltration facility having a wide

rectangular shape as a whole, however, as illustrated in Fig.

23, it is also possible to construct a rainwater storage and

infiltration facility 70 of an L-shape as a whole by combining

the four-pedestal-type frame-shaped block units 71, the

two-pedestal-type frame-shaped block units 72, and a

one-pedestal-type block unit 73, as appropriate.

[0046]

Fig. 24 illustrates a rainwater storage and infiltration

facility as an example that is configured to have a stepped

shape as a whole. Some block units in one corner portion and

in the vicinity position thereof of a constituting body having

a rectangular shape in which the frame-shaped block units 71

are arranged in the X and Y directions are removed, the

one-pedestal-type block units 73 are arranged as appropriate,

and shield plates 74 connected in an accordion shape are

installed on the entire side portion, whereby it is possible to construct a rainwater storage and infiltration facility 75 having a stepped shape as a whole. Accordingly, in the invention, it is possible to obtain a rainwater storage and infiltration facility of a form suitable for surrounding statuses such as a land shape, an area, and an installation environment of the facility, by combining unitized components of a limited and small number of types as appropriate.

[0047]

With the embodiment of the invention of such an aspect,

itis possible to assemble a rainwater storage andinfiltration

facility in a configuration freely in vertical and horizontal

directions, such as a rectangular parallelepiped type, an

L-character type, and a stepped type, by combining unit block

members of the minimum number. Moreover, by providing

inclined surfaces at the assembled position of the unit block

members, it is also possible to smoothly engage the respective

unit block members with each other.

[0048]

Moreover, with another embodiment of the invention in

which unit block members are formed to have a grid-like rib

form as illustrated in Figs. 7 to 12, in addition to the effect

by the abovementioned first embodiment, it is possible not to

impair the strength while aiming reduction in overall weight,

and to secure water passage holes sufficient to let rainwater

escape.

Industrial Applicability

[0049]

In the rainwater storage and infiltration facility by

the invention, it is possible to implement the structure in

which when constituting bodies are vertically stacked to have

a multistage form, the assembly of the respective constituting

bodies is easy, and the strength of each configuration unit

member of the constituting body is improved, and various kinds

of forces to be applied to the constituting body is dispersed,

so that the entire structuralbody is difficult to be deformed.

Moreover, with the invention, it is possible to implement the

rainwater storage and infiltration facility of the overall

planar shape of the facility such as a rectangular shape, an

L-shape, or a stepped shape with the minimum component

configuration by freely combining constituent members of the

few types, and arbitrarily select an installation shape each

time in accordance with a place where the rainwater storage

and infiltration facility is installed and a status of the

surrounding of the place, an installation area, and the like.

Claims

[Claim 1]

A unit block member of a rainwater storage and

infiltration facility comprising: a quadrate plate with a

cross-shaped plane portion being formed on one of the

single-side surfaces; rectangular recessed portions that are

respectively formed in the single-sided surface four corner

portions ofthe quadrate plate bybeingadjacent to armportions

of the cross-shaped plane portion of the quadrate plate, each

of which includes a through-hole in a bottom surface thereof;

and hollow tubular leg portions that extend from the other

single-side surface of the quadrate plate by being aligned with

the through-holes in the rectangular recessed portions, which

results in a four-leg block form configuration, characterized

in that

the rectangular recessed portion includes recessed

portion section walls that demarcate the recessed portion with

respect to the cross-shaped plane portion of the quadrate plate,

the bottom surface of the rectangular recessed portion is

linked with an outer side portion at the corner portion of the

quadrate plate, and inclined surfaces are respectively formed

in a link portion between the bottom surface of the rectangular

recessed portion and the outer side portion of the quadrate

plate, and a link portion between the bottom surface of the

rectangular recessed portion and the recessed portion section wall.
[Claim 2]

A unit block member of a rainwater storage and

infiltration facility, in which a rectangular plane portion

and rectangular lower surface portions on both sides of the

rectangular plane portion by being adjacent thereto are formed

on one of single-side surfaces, a through-hole is formed in

each of the rectangular lower surface portions, and a hollow

tubular leg portion that is formed on the other single-side

surface and is aligned with the through-hole of each of the

rectangular lower surface portions is formed, which results

in a two-leg block form configuration, characterized in that

a side portion section wall is formed on a single side

portion of each of the rectangular lower surface portions by

beinglinkedwithasingle side portion ofthe rectangularplane

portion, and

inclined surfaces are respectively formed in a link

portion between each of section walls that demarcate the

rectangular lower surface portion and a bottom surface of the

rectangular lower surface portion, and a link portion between

the bottom surface of the rectangular lower surface portion

and a member side portion.
[Claim 3]

A unit block member of a rainwater storage and

infiltration facility comprising: a rectangular plate that includes a through-hole in a center thereof; section walls that are formed on two adjacent side edges on one of the single-side surfaces of the rectangular plate; and one hollow tubular leg portion that is formed on the other single-side surface of the rectangular plate by being aligned with the through-hole, which results in a one-leg block form configuration, characterized in that inclined surfaces are respectively formed in a link portion between the one of the single-side surfaces of the rectangular plate and the section wall, and a link portion between the one of the single-side surfaces of the rectangular plate and a rectangular plate side portion.
[Claim 4]

A frame-shaped block unit in a rainwater storage and

infiltration facility comprising the unit block members

according to any one of Claims 1 to 3, characterized in that,

the hollow tubular leg portions of a pair of the unit block

members are caused to face each other in an axis line direction

thereof and leg portion tips are connected to each other in

a fitted state.
[Claim 5]

A rainwater storage and infiltration facility,

characterized in that, a plurality of the frame-shaped block

units each including a pair of the unit block members of the

four-leg block form configuration according to Claim 1 are installed by being arranged at a predetermined interval therebetween in the X and Y directions.
[Claim 6]

A rainwater storage and infiltration facility,

characterized in that, at the upper side of lower-side

frame-shaped block units arranged in the X and Y directions

at an interval therebetween corresponding to a width size of

the arm portion of the cross-shaped plane portion of the unit

block member by the four-leg block form configuration

according to Claim 1, a plurality of upper-side frame-shaped

block units are arranged in the X and Y directions each at a

position shifted in a diagonal line direction so as to extend

over the rectangular recessed portions at the four corner

portions of four lower-side frame-shaped block units that are

adjacent to one another in the diagonal line direction, and

the rectangular recessed portions of the lower-side and

upper-side frame-shaped block units are joined to each other.
[Claim 7]

The rainwater storage and infiltration facility

according to Claim 6, characterized in that, the lower-side

and upper-side frame-shaped block units that are arranged in

the X and Y directions at the interval therebetween

corresponding to the width size of the arm portion of the

cross-shaped plane portion of the unit block member by the

four-leg block form configuration according to Claim 1 are vertically stacked in a plurality of stages such that the upper-side frame-shaped block units are respectively shifted in the diagonal line direction with respect to the lower-side frame-shaped block units.
[Claim 8]

The rainwater storage and infiltration facility

according to any one of Claims 5 to 7, characterized in that

a plurality of the frame-shaped block units each including a

pair of the unit block members by the four-leg block form

configuration are installed in the X and Y directions by being

arranged at the predetermined interval therebetween, and a

side portion frame-shaped block unit including a pair of the

unit block members by the two-leg block form configuration

according to Claim 2 is provided on an outer side portion of

an entire constituting body thereof.
[Claim 9]

The rainwater storage and infiltration facility

according to any one of Claims 5 to 8, characterized in that

a plurality of the frame-shaped block units each including a

pair of the unit block members by the four-leg block form

configuration are installed in the X and Y directions by being

arranged at the predetermined interval therebetween, and a

corner portion frame-shaped block unit including a pair of the

unit block members by the one-leg block form configuration

according to Claim 3 is provided on a corner portion of the entire constituting body.
[Claim 10]

A rainwater storage and infiltration facility,

characterized in that a plurality of the frame-shaped block

units each including a pair of the unit block members of the

four-leg block form configuration according to Claim 1 are

arranged in an L-shape as a whole at a predetermined interval

therebetween, and the side portion frame-shaped block unit by

the two-leg block form configuration according to Claim 2 and

the frame-shaped block unit by the one-leg block form

configuration according to Claim 3 are provided in a side

portion of an entire constituting body thereof.
[Claim 11]

A rainwater storage and infiltration facility,

characterized in that the frame-shaped block units each

including apair of the unit block members by the four-leg block

form configuration according to Claim 1 are arranged in the

X and Y directions at a predetermined interval therebetween,

a form in which the frame-shaped block units in one corner

portion and in a vicinity thereof of an entire constituting

body are removed is employed, the side portion frame-shaped

block unit by the two-leg block form configuration according

to Claim 2 and the frame-shaped block unit by the one-leg block

form configuration according to Claim 3 are provided in a side

portion of the entire constituting body, and the entire constituting body is a block unit arrangement form of a stepped shape.
[Claim 12]

The rainwater storage and infiltration facility

according to any one of Claims 5 to 11, characterized in that

a surface of the frame-shaped block unit that is installed at

the highest stage is shielded by an immersible shielding body.