JP2001323520A - Water storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water storage system capable of storing water such as rain water or the like in a water storage space constructed under the ground and using the stored water also as drinking water. SOLUTION: In the water storage system constituted of a first water storage tank 1, a first side ditch 2 as a current inflow channel connected to a current inlet 12 of the first water storage tank 1, a second water storage tank 3 connected to the first water storage tank 1 with a first outflow hole 13 made in the water-purified layer side, first and second conduits 4 and 5 respectively connected with drain outlets 14 and 22 provided to the first and second water storage tanks 1 and 3, and a side ditch 6 as a drain connected to a drain outlet 15 provided to the first water storage tank 1, a skeleton member 1a as a space supporting body for forming a water holding space is laminated and placed in the first water storage tank 1, and a water-purified layer 11 as a purification section is provided to a part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water storage system for storing and reusing wastewater such as rainwater in a water storage tank.

[0002]

2. Description of the Related Art A conventional water storage system will be described with reference to FIG. This water storage system is disclosed in
No. 17394, a concrete water storage tank 100 is accommodated in a recess formed under the ground, and a water-impervious layer 110 such as a water-impervious sheet is provided on the inner wall of the water-retainer tank 100. A unit skeletal member 120 as a space support having a void forming a water holding space is accommodated in a water storage tank 100 provided with a layer 110, and a water holding space by the unit skeletal member 120 formed in the water storage tank 100 is provided. Storing rainwater, etc.
(In FIG. 3, the cells in the water storage tank 100 are shown by omitting the unit skeletal member 120 in FIG. 3). Since roads and parks are formed on the water storage tank 100, the unit skeletal member 120 filled in the water storage tank 100 supports the load on the upper part of the water storage tank 100 and the parks and roads. The water holding space is formed by the gap.

[0003] Further, without using the water storage tank 100, a water-impervious layer 11 such as a water-impervious sheet is formed on the inner wall of a concave formed in the ground.
0, the unit skeletal members 120 are stacked close to the ground, a sheet or the like is placed on the unit skeletal members 120 located on the uppermost layer, and the soil is backfilled to form a water storage system. . According to the above water storage system, the water storage system is supported by the laminated unit skeleton members, so that the water storage system can be used for roads, parks, and the like, and the land can be effectively used. Further, since each unit skeleton member has a gap, rainwater can be efficiently stored in the water holding space formed by the gap. In addition, if a unit skeleton member having a high porosity is used, the water storage efficiency is increased.

[0004]

However, in the conventional water storage system, since wastewater such as rainwater is stored as it is, it is not possible to remove organic substances, color components, chlorine, ammonia, etc. contained in the wastewater. The stored water could be used as fire water or water for sprinkling, but could not be used as drinking water.

Accordingly, an object of the present invention is to provide a water storage system in which drainage such as rainwater is stored in a water storage tank and used not only for watering but also for drinking water. .

[0006]

According to a first aspect of the present invention, there is provided a water storage system including a purifying section for purifying water such as rainwater taken in through a water inlet of a water storage tank, and purifying the water through the purifying section. The purified water that has been purified and the water that has not been purified by the purification section can be separately taken out. The water storage system according to claim 2 is provided with the water storage tank underground,
In the internal space of the water storage tank, a space support for forming a water holding space is laminated, and the space support supports the weight of a park or a road formed on the water storage tank. Things. In addition, the water storage system according to claim 3 is provided with an auxiliary purification unit that further purifies the purified water. A water storage system according to a fourth aspect is provided with a filtering device in front of the water inlet.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a water storage system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a top view of the water storage system according to the present embodiment, and FIG.
1 is an AA cut-away view of FIG. 1, FIG. 3 is a BB cut-away view of FIG. 1, FIG. 4 is a CC cut-away view of FIG. 1, and FIG. 5 is a DD cut-away view of FIG. In the present embodiment, a first water storage tank 1 is provided which is accommodated in a recess formed by excavating the ground, and a water holding space for forming a water holding space is provided in the first water storage tank 1. A skeletal member 1a is stacked and arranged as a space support, and a purification unit 11 is provided in a part thereof. The water storage system according to the present embodiment includes a first water storage tank 1, a first gutter 2 as a water inflow path connected to a water inlet 12 of the first water storage tank 1, 2nd water tank 3 which communicates with 1st water tank 1 by the 1st discharge hole 13 provided in
And the first and second water tanks 1 and 2, and the first and second water tanks 3, respectively, are provided with discharge holes 14 and 32, respectively, and communicate with each other.
And a second gutter 6 as a drainage channel connected to a water outlet 15 provided in the first water storage tank 1.

The first water storage tank 1 is accommodated in a recess formed by excavating the ground, and is formed in a substantially rectangular parallelepiped box shape by a rectangular plate 1b to be described later.
Inside the first water storage tank 1, a skeletal member 1 described later as a space support is provided between the bottom plate 1C and the top plate 1D.
a are stacked. (In FIGS. 2 and 3, the cells in the water storage tank 1 are shown without the unit skeleton member 1a.) The bottom plate 1C of the first water storage tank 1 is extended vertically. A rising piece 11b of a certain height is provided to partition between the side wall 1A and the other side wall 1B, and the rising piece 11b is lower than the position where the water inlet 12 and the outlet 15 are provided. Is formed. Inner side wall 1B partitioned by this rising piece 11b
On the side, the skeletal member 1 stacked from the bottom plate 1C of the first water storage tank 1 to the height of the upper end of the rising piece 11b
The purifying material 11a is filled in the space provided in the area a. Thereby, the first purification unit 11 is formed in the first water storage tank 1.

In the present embodiment, zeolite compressed and solidified is used as the purifying material 11a. Zeolites are predominantly hydrous silicates of aluminum, sodium and calcium and have a constant pore size in the range of 3-10 °. Therefore, based on the pore structure, it is possible to adsorb organic substances, color components, chlorine, ammonia and the like in the waste water. In addition, it has a high cation exchange capacity, which has the effect of softening hard water. As this zeolite, either a natural zeolite such as mordenite or a synthetic product may be used.

The first gutter 2 is an inflow passage for allowing drainage such as rainwater to flow into the first water storage tank 1, and a downstream end 2 A of the first gutter 2 is provided in the first water storage tank 1. One side wall 1
A is connected to a water inlet 12 provided at the top of A.
The first gutter 2 is made of concrete or the like. The first gutter 2 is a removable filtration device for filtering drainage such as rainwater that has flowed in and flowing into the first water storage tank 1. A first filter 21, a second filter 22, and a third filter 23 are attached.
Between the first filter 21 and the second filter 22 and between the second filter 22 and the third filter 23, concave portions forming first and second settling tanks 24 and 25 are formed, respectively. I have. In the present embodiment, the first filter 21 and the second filter 22 are made of, for example, a wire mesh, and the second filter 22 has a finer mesh than the first filter 21. The third filter 23 is made of zeolite as a purifying material. Since the third filter 23 is made of zeolite and the amount of water passing through the third filter 23 is smaller than the amount of water passing through the second filter 22, the side groove 2 is separated from the second filter 22 by the third filter 23. It is formed so as to be wider toward.

The second water storage tank 3 is housed in a recess formed by excavating the ground similarly to the first water storage tank 1. It is arranged adjacent to the other side wall 1B side. This second water tank 3
Like the first water storage tank 1, it is formed in a substantially rectangular parallelepiped box shape by the rectangular plate 3b. The first water storage tank 1 and the second water storage tank 3 communicate with each other through a discharge hole 13 formed so as to penetrate adjacent side walls 1B and 3A.
Through the drain holes 13, of the drainage that has flowed into the first water storage tank 1 from the first side groove 2 and stored therein, the water that has passed through the first purification unit 11 is discharged to the second water storage tank 3. You. Inside the second water storage tank 3, a skeletal member 3a is disposed between the bottom plate 3C and the top plate 3D in the same manner as in the first water storage tank 1. Further, the bottom plate 3C is disposed so as to be located at a position deeper than the bottom plate 1C of the first water storage tank 1, and the space of the skeleton member 3a is located at a position lower than the height of the discharge hole 13. Is filled with the purifying material 31a to form the second purifying unit 31.

The first and second conduits 4 and 5 are for pumping the stored water by a pump or the like (not shown).
The water guide pipe 4 is disposed adjacent to the side wall 1A of the first water storage tank 1, and the discharge hole 1 penetrating through the first water guide pipe 4 is provided.
4 is provided near the bottom of the side wall 1A of the first water storage tank 1. The second water pipe 5 is disposed adjacent to the side wall 3 </ b> B of the second water tank 3, and a discharge hole 32 penetrating through the second water pipe 5 is formed in the second water tank 3. Side wall 3
B is provided near the bottom. As a result, water that flows into the first water pipe 4 from the water inlet 12 and does not pass through the purification unit 11 in the first water tank 1 is stored. Is the purification unit 1 in the first water tank.
1 and then the water that has passed through the purification unit in the second water storage tank 3 is stored. Each of these conduits 4, 5
As shown in FIGS. 4 and 5, it is formed in an inverted T-shape, extends substantially parallel to the ground surface, and is disposed along a position near the bottom of the side walls 1A and 3B of the water storage tanks 1 and 2. And horizontal portions 4A and 5A, and vertical portions 4B and 5B extending from near the center of the horizontal portions 4A and 5A to the ground surface. Each of the discharge holes 14 and 32 is connected to each of the side walls 1A and 3
B so as to penetrate through each of the horizontal portions 4
It is provided at a position shifted laterally from the center of A, 5A. Since the horizontal portion 5A of the second water pipe 5 is disposed at a position corresponding to the bottom of the second water storage tank 3, it is disposed at a position deeper than the first water pipe 4; The vertical portion 5B is formed longer than the vertical portion 4B. In addition, on the ground surface of each vertical part 4B, 5B,
Normally, metal covers 4a and 5a are placed.

Reference numeral 6 denotes a second side groove serving as a discharge path, and the side wall 1 on the opposite side faces the first side groove 2.
B is connected to a discharge port 15 formed at the top of B. Further, the top plate 1 of the first water tank 1 and the second water tank 3
A ground 10 formed by embankment or the like is formed on D and 3D. In addition, a discharge port 15 connected to the second gutter 6 is provided at an upper portion of the side wall 1B of the first water storage tank 1, and water exceeding an allowable amount of the first water storage tank 1 is supplied to the second gutter. 6 will be discharged. The gutter 6 as the drainage channel is formed of concrete or the like, like the gutter 2 as the inflow channel, and has an upstream end 6A connected to the outlet 15.

Further, the top plate 1D of the first water storage tank includes:
As shown in FIGS. 1 and 3, at a position near the side wall 1B,
An elliptical hole 16 penetrating the ground 10 is formed. The hole 16 has such a size as to allow a hose or the like for flowing cleaning water into the first water storage tank 1 to pass therethrough. In addition, a substantially circular hole 33 penetrating the ground 10 is formed in the top plate 3D of the second water storage tank 3 at a substantially intermediate position between the side walls 3A and 3B as shown in FIGS. Have been. This hole 33 is for investigating whether or not the quality (pH) of the water stored in the second water storage tank 3 is drinkable, and is necessary for using the water as drinking water as necessary. Components and the like can also be injected.

As the skeletal members 1a and 3a stacked in the water storage tanks 1 and 3, for example, a skeletal structure 7 shown in FIGS. 6 and 7 is used. This skeleton construct 7
A plurality of unit skeleton members 7a, each of which is a unit member formed of a regular hexagonal column and having a hollow portion 71 at the axial center portion, are integrally formed so as to be arranged in the horizontal direction. That is, the skeletal structure 7 is integrally formed of resin or the like so that the upper surfaces and the lower surfaces of the unit skeleton members 7a are aligned on the same plane. Although FIG. 6 shows the skeleton structure 7 composed of 16 unit skeleton members 7a, the skeleton structure 7 may be composed of a plurality of unit skeleton members 7a. The number of the unit skeleton members 7a may be determined arbitrarily. Each of the unit skeleton members 7a is, as shown in FIG.
Each of the six corners on the upper surface 7A is provided with a projection 72, and each of the six corners on the lower surface 7B is provided with a recess 73. A semicircular cutout 74 is formed between the adjacent recesses 73. Therefore, water flows through the hollow portion 71 and the cutout portion 74, thereby forming a water holding space. In the method of stacking and arranging the skeleton members 7, first, the skeleton members 7 are arranged at the bottoms of the water storage tanks 1 and 3. The second-layer skeletal structure 7 is positioned so as to straddle the portion (joint portion) where the first-skeletal structure 7 contacts, and the first-skeletal structure 7 is positioned on the first-layer skeletal structure 7. The second-layer skeletal structure 7 is laminated. Second-layer skeletal structure 7
The connection between the skeleton member 7 of the first layer and the projection 72 of each unit skeleton member 7a of the skeleton member 7 of the first layer and the unit skeleton member 7a of the skeleton member 7 of the second layer Recess 7
3 may be fitted. As a result, the skeleton members 7 of the first layer straddled by the upper skeleton members 7 are connected by the upper skeleton members 7. Hereinafter, similarly, the skeletal structure 7 is stacked and arranged up to the uppermost layer. After stacking and arranging the skeletal components 7 to the uppermost layer, a sheet or the like is placed on each of the skeletal components 7 in the uppermost layer, and the soil is backfilled, whereby a water storage system is configured. The gap between the inner surface of each of the water storage tanks 1 and 3 and the skeletal structure 7 is filled with a foaming material or the like (not shown). In the present embodiment, the purifying units 11, 3
In item 1, a purifying material may be filled in place of the foam material.

As the rectangular plates 1b and 3b constituting the outer walls of the first and second water storage tanks 1 and 3 according to the present embodiment, for example, those shown in FIGS. . In this figure, reference numeral 81 denotes a first member constituting the apex portion 8A of the water tank, and ends of three rectangular plate members 8, 8, 8 are connected to each other so that the surfaces 8f are at right angles to each other. Made of an integrally molded product. Reference numeral 82 denotes a second member constituting the corner 8B of the water storage tank, and is an integral member in which ends of the two rectangular plate members 8, 8 are connected to each other by a connecting portion so that the surfaces 8f are at right angles to each other. Consists of molded products. 83 is a third member made of one rectangular plate 8 which is an integrally molded product.

The rectangular plate member 8 constituting each of the members 81, 82, 83 is formed into a square shape with a resin or the like (for example, a 1m × 1m square). Each of the above members 8
1, 82, 83 are molded using, for example, a plastic material such as polypropylene or FRP. In particular,
Reaction Injection Molding (Reaction Injection)
Molding (RIM method for short) or resin transfer molding (Rejin Transfer Mold)
(RTM method for short).

The rectangular plate 8 constituting the third member 83 is
As shown in FIG. 9, a square frame 8a and this frame 8
a extending from one end side 8b inside the water tank at 4a
A board portion 8e composed of a corner flat plate portion 8c and a central cross-shaped flat plate portion 8d, a rising piece 8t which rises outward so as to be slightly inclined from the board portion 8e, and a protruding surface 8g for connecting the tips of these rising pieces 8t. And a reinforcing rib 8h comprising: A surface 8f of the rectangular plate 8 is constituted by the substrate portion 8e and the protruding surface 8g of the reinforcing rib 8h. The reinforcing rib 8h is outwardly formed of an L-shaped outward protruding portion around the cross-shaped flat plate portion 8d. The L-shaped ends of the reinforcing rib 8h are connected to the inner surface 8i of the frame 8a. A reinforcing rod mounting block 9A having a hole 9a for passing the reinforcing rod 9 is provided at the center of the outer surface of the cross-shaped flat plate portion 8d.

As shown in FIG. 10, the ends of the two rectangular plates 8 are connected to each other by a connecting portion 8j so that the surfaces 8f of the rectangular plates 8 are at right angles to each other, as shown in FIG. It is integrally formed in a state where it is in a state of being bent. The connecting portion 8j includes a rising piece 8k and a connecting piece 8m that connects the tips of the rising pieces 8k. Similarly, the first member 81 also
The end portions of the three rectangular plate members 8, 8, 8 are integrally formed so as to be connected to each other by connecting portions so that the surfaces 8f of the rectangular plate members 8 are at right angles to each other. As shown in FIG. 10, the rising piece 8k and the rising piece 8t parallel to the rising piece 8k are formed in parallel with the direction in which the molded product is removed from the mold. In the case of the first member 81 and the second member 82,
Instead of the square frame portion 8a, the frame portion surrounds the outer periphery and protrudes outward.

As shown in FIG. 11, the connection between the members 81, 82, and 83 is such that the ends of the members are engaged with each other and the frame portions 8a are fixed with bolts 8r or the like. That is, the end of the rectangular plate 8 of one member is connected to the rectangular plate 8 of the other member.
A piece 8p covering the inner surface 8u (inner surface of the water tank) is provided, and a watertight material 8q such as a sealing material is provided near a boundary between the outer surface 8n of the frame portion 8a of one member and the inner surface of the piece 8p. In advance, the inner surface 8u of the other member is brought into contact with the inner surface of the piece 8p of the one member, and the outer surface 8n of the frame portion 8a of the other member is connected to the outer surface 8n of the frame portion 8a of the one member.
After that, the frame portions 8a of each member are fixed to each other with bolts 8r or the like.

As shown in FIG. 12, the water tanks 1 and 3 according to the present embodiment are assembled into three L-shaped ends 81L, 81L and 81L which are open ends of the first member 81, as shown in FIG. The L-shaped ends 82L of the second members 82 are connected, and the L-shaped ends 82R of the next second members 82 are connected to the L-shaped ends 82R, which are the open ends of the second members 82, respectively. Member 82
The end 83S of the third member 83 is connected to the end 82S, which is the open end of, and the water tanks 1, 3 are assembled. In other words, the first member 81 and the second member 82 form the vertex 8A and the side corner 8B of the water tank, and the third member 83 is placed between the second members 82 forming the side corner 8B. The water tanks 1 and 3 are completed by the connection. Finally, the rectangular plate 8 is reinforced by passing the reinforcing rod 9 through the hole 9a of the reinforcing rod mounting block 9A in order to prevent the rectangular plate 8 from being deformed outward due to the internal water pressure. Whether or not the reinforcement is performed by the reinforcing rod 9 may be arbitrarily determined in consideration of the strength of the rectangular plate 8. In addition, if it demonstrates in a figure, the said piece 8p will
In the first member 81, three L-shaped ends 81L, 81L
The second member 82 is provided on the L-shaped end 82R, and the third member 83 is provided on two continuous pieces (ends 83S, 83S).

According to the water tank of the above embodiment, a water tank of a desired size can be easily assembled simply by connecting three types of members (first, second and third members). The labor and cost for manufacturing the water storage tank can be reduced. The size of the water storage tank can be adjusted by adjusting the number of the second members 82 and the third members 83.
Watertightness is ensured by a watertight material 8q such as a sealing material, and reinforced by the reinforcing ribs 8h and the reinforcing rods 9, so that a highly reliable water tank having excellent watertightness and strength can be obtained. Can be

Incidentally, the rectangular plate member 8 may be not a square but a rectangular one. Also, the third molded separately
A first member 81 or a second member 82 assembled by connecting and fixing the ends of the members 83 with bolts or the like may be used.

The operation of the water storage system thus configured according to this embodiment will be described. First, drainage such as rainwater flows into the upstream side of the first gutter 2. This drainage contains driftwood, leaf litter, sludge, stones and the like, but the large driftwood and the like are removed by the first filter 21 formed of a large wire mesh attached to the gutter 2. The first sedimentation tank 24 removes heavy stones and the like contained in the wastewater that has passed through the first filter 21. Next, the first filter 21 and the first sedimentation tank 2 are formed by the second filter 22 and the second sedimentation tank 25 formed of a small wire mesh.
Litter, gravel, etc. contained in the wastewater passing through 4 are removed. Further, the third filter 23 formed of a purifying material such as zeolite removes organic substances and the like contained in the second filter 22 and the second sedimentation tank 25, and is purified to the extent that it can be used for fire prevention or water sprinkling. Drainage flows into the first water storage tank 1 through the water inlet 12.

In the first water storage tank 1, a part of the water purified to some extent through the side groove 2 passes through a first purification section 11 formed by being partitioned by the rising pieces 11b. At this time, the purification material 11 filled in the first purification unit 11
With a, fine organic matter, color components, chlorine, ammonia, and the like contained in the wastewater that has passed through the first to third filters 21 to 23 and the first and second settling tanks 24 and 25 can be removed. Also, by using zeolite as the purifying material 11a, hard water can be softened. The wastewater that has passed through the first purification unit 11 is discharged to the second water storage tank 3 from a discharge hole 13 provided in the side wall 1B. Thereby, the water further purified by the first purification unit 11 is stored in the second water storage tank 3. Second
In the water storage tank 3, the water further purified by the first purification unit 11 passes through the second purification unit 31. Thereby, similarly to the first purification unit 11, fine organic substances and the like are further removed. This second purification unit 3
1 passes through a discharge hole 32 provided in the side wall 3B.
Is discharged to the second water pipe 5. Therefore, the water purified by the second purifying section 31 to an extent that it can be drunk is stored in the second water pipe 5, and the water stored in the second water pipe 5 is stored in the second water pipe 5. By pumping it to an external pump or the like, it can be used for drinking water in an emergency.

Further, in the first water storage tank 1, another part of the water purified to some extent through the side groove 2 is discharged to the first water guide pipe 4 from a discharge hole provided in one side wall 1A. Is done. The water stored in the first water pipe 4 can be used for fire prevention or water sprinkling, etc. by being pumped up by a pump or the like (not shown).

As described above, according to the water storage system according to the present embodiment, driftwood and the like contained in drainage such as rainwater are removed and stored, and further, water is purified and stored using a purification material made of zeolite or the like. Therefore, water used for fire prevention, watering, etc., and drinking water can be stored separately. In the case of increasing water due to heavy rain, etc., the amount of water exceeding the allowable amount of the first water storage tank 1 is discharged from the drain port 15 provided on the other side wall 1B.
Will flow into. In addition, at the time of such water increase, the first to third filters 2 in the first side groove are used.
1 to 23 may be removed. Thereby, it is possible to prevent the drainage from overflowing from the side groove 2.
Further, the inside of the first water storage tank 1 is cleaned by forcing water or the like through a through hole 16 provided in the top plate 1D of the first water storage tank 1 through a hose or the like (not shown). Can be. In addition, the water quality (pH) and the like can be inspected by the through holes 33 provided in the top plate 3D of the second water storage tank 3, and necessary components can be added so as to be drinkable.

In this embodiment, zeolite is used as the purifying material. However, the present invention is not limited to this, and various purifying materials such as activated carbon and nonwoven fabric can be used. Further, zeolite as each of the above-described purifying materials may be a material in which antibacterial metal ions such as silver ions are supported. Thereby, propagation of various germs in the water storage tank can be suppressed, and more sanitary drinking water can be obtained. Further, the filtering device attached to the gutter as the inflow channel is not limited to a wire mesh filter or a zeolite filter, and may be a device capable of removing organic substances and the like contained in the waste water to such an extent that it can be used for watering or the like. I just need. Further, the filtering device may be attached to a discharge hole of the first water storage tank. Further, in the present embodiment, the second water storage tank is provided, but the second water storage tank is not necessarily required if it is possible to obtain drinkable water by the purification unit in the first water storage tank. Instead, the second water pipe may be connected to the first water tank.

[0029]

According to the water storage system according to the first aspect of the present invention, a purifying section for purifying water such as rainwater taken in through the water inlet is provided inside the water storage tank. Purified water that has been purified and water that has not been purified by the purification section can be taken out separately, so the water stored in the water storage tank can be used not only for watering but also for drinking water. Becomes In addition, the water storage system according to claim 2 accommodates the water storage tank in a concave portion formed by excavating the ground, and includes a space support for forming a water holding space in the internal space of the water storage tank. The layers are stacked to support the weight of a park, a road, or the like formed on the water storage tank, so that the land can be used on the water storage system. In addition, the water storage system according to claim 3 includes the second purification unit that further purifies the purified water, so that more suitable water as drinking water can be obtained. In addition, the water storage system according to claim 4, the water inlet, one or more filtration devices,
Since the water inflow channel with one or more settling tanks was connected,
It is possible to purify not only drinking water but also water used for watering and the like.

[Brief description of the drawings]

FIG. 1 shows a water storage system according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a CC cutaway view of FIG. 1;

FIG. 5 is a sectional view taken along the line DD of FIG. 1;

FIG. 6 is a simplified perspective view showing a water tank according to the embodiment of the present invention.

FIG. 7 is a perspective view showing details of a third member made of a rectangular frame material constituting a water tank according to the embodiment of the present invention.

FIG. 8 is a cut-away view showing a state of being cut at a portion corresponding to a dashed-dotted line portion in FIG. 7, using a second member as an example.

FIG. 9 is a diagram showing details of a connection portion of each member.

FIG. 10 is a perspective view for explaining an assembling method of the water tank.

FIG. 11 is a plan view showing a skeleton structure as a space support housed in a water tank.

FIG. 12 is a perspective view of a unit skeleton member constituting the skeleton structure.

FIG. 13 is a diagram showing a conventional water storage system.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 first water tank, 11 purification section, 2 first gutter, 3
2nd water tank, 31 2nd purification | cleaning part, 7 skeletal structure, 8 rectangular plate material.

 ──────────────────────────────────────────────────の Continued on front page F term (reference) 2D063 AA01 DB01 3E070 AA13 AB02 BH01 DA06 GB01 GB09 RA02 RA30 SA01 SA20 4D064 AA01 BA02

Claims (4)

[Claims] 1. A purification unit for purifying water such as rainwater taken in through a water inlet of a water storage tank, wherein purified water purified via the purification unit and water not purified by the purification unit are provided. A water storage system characterized in that it can be taken out separately. 2. The water storage tank is provided underground, and a space support for forming a water holding space is laminated in an internal space of the water storage tank, and the space support supports the water storage tank. The water storage system according to claim 1, wherein the water storage system is adapted to support a weight of a park, a road, and the like formed on the upper surface. 3. The water storage system according to claim 1, further comprising an auxiliary purification unit that further purifies the purified water. 4. The water storage system according to claim 1, further comprising a filtration device in front of said water inlet.