JP2002105995A - Rainwater storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater storage device by which dirty rainwater which has just started to fall is automatically discharged and only clean rainwater can be stored. SOLUTION: A cylindrical body 18 with the bottom is erected near a water storage tank T and the upper end of the cylindrical body 18 is connected to a headrace pipe 17 through which rainwater is conducted to the water storage tank T and water discharging opening 18c by which the volume of the discharge water can be adjusted is provided at the lower part of the cylindrical body 18 to constitute the rainwater storage device. If the discharging water volume from the discharging opening 18c is previously adjusted so that the water discharge volume from the water discharging opening 18v is less than an expected inflow volume which is expected to inflow into the water storage tank T through the headrace pipe, rainwater which has started to fall inflows from the headrace pipe 17 into the cylindrical body 18 and it is discharged from the discharging opening 18c. And the water level in the cylindrical body rises due to the difference between the discharge water volume and the inflowing water volume, at the time when the clean rainwater inflows after an elapsed time, the water level in the cylindrical body 18 reaches the connection part of the upper end, and hence, only clean water inflows into the water storage tank T and stored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater storage device capable of discharging dirty rainwater at the beginning of falling and storing only clean rainwater.

[0002]

2. Description of the Related Art In recent years, attempts have been made to store rainwater falling on a roof of a house or a roof of an agricultural and horticultural house in a tank and use it for plant cultivation and irrigation or for watering a roof in summer.
The effective use of rainwater in this way is economically advantageous because the amount of tap water used can be considerably reduced.

[0003] However, hitherto, rainwater falling on the roof has been introduced directly from the rain gutter to the water storage tank through the water pipe, and thus has the following problems.

[0004]

That is, dust and dirt such as dead leaves, feces of birds and small animals, etc. adhere to the roof of a house or the like. Until now, since rainwater that has started to fall is also stored in the tank through the water conduit, there is a problem that even the above foreign substances and dirt can enter the tank and not only store clean rainwater. Was.

In addition, the rainwater at the beginning of falling often has a low pH, and in an area near the seaside, salt deposited on the roof is considerably contained in the rainwater at the beginning of falling. There is also a problem that if rainwater containing rainwater is stored and used for plant cultivation or irrigation, the plants may be adversely affected.

[0006] Furthermore, many conventional water storage tanks are cumbersome to build and expensive, and there is a problem that there is almost no simple tank that can be built easily and inexpensively.

SUMMARY OF THE INVENTION The present invention has been made to address these problems, and a first object of the present invention is to provide a rainwater storage device capable of automatically discharging dirty rainwater that has begun to descend and storing only clean rainwater. A second object of the present invention is to provide a simple water storage tank that can be easily and inexpensively constructed as a tank of the rainwater storage device.

[0008]

Means for Solving the Problems To achieve the first object, a rainwater storage device according to a first aspect of the present invention has a bottomed cylinder standing near a water storage tank to store rainwater in the water storage tank. The upper end of the cylindrical body is connected to the water guide pipe introduced into the pipe, and a water outlet for adjusting the amount of water discharge is provided at the lower part of the cylindrical body.

In order to achieve the second object, a rainwater storage device according to a second aspect of the present invention is characterized in that the water storage tank is formed by a large number of metal wall elements curved in an arc shape in the vertical and circumferential directions. A cylindrical container assembled by joining in the directions, an impermeable water storage bag housed in the cylindrical container, the upper end of which is opened, and a light-shielding lid attached to the upper end opening of the cylindrical container. It consists of a body.

In the rainwater storage device according to the first aspect, the amount of water discharged from the water outlet is determined in advance so that the amount of water discharged from the water outlet is smaller than the expected amount of rainwater expected to flow into the water storage tank through the water pipe. Adjust and use. If the amount of water discharge is adjusted in this way, the dirty rainwater that begins to descend flows into the cylinder from the water pipe, and due to the difference between the amount of water flowing into the cylinder and the amount of water discharged from the water outlet, the rainwater gradually decreases. The water accumulates inside the cylinder, and the water level inside the cylinder rises. Then, after a certain period of time has passed since the start of the descent, when the clean rainwater flows through the inlet pipe, the water level rises to the connection at the upper end of the cylindrical body, so the clean rainwater flows into the water storage tank through the water pipe. I do. Therefore, only clean rainwater is stored in the water storage tank, and this rainwater can be effectively used for plant cultivation, watering, roof watering, car washing, and other uses.

The rainwater storage tank of the rainwater storage device according to the second aspect of the present invention stores rainwater in an impermeable water storage bag accommodated in a cylindrical container. There is no need to assemble the cylindrical container by joining the wall elements in a watertight manner, and it is sufficient to assemble the cylindrical container by joining the wall elements by simple joining means such as bolts and nuts or bending so as not to separate the wall elements. So
Since the assembling work of the cylindrical container is simple and the production of the lid is easy, the water storage tank can be constructed in a short period of time and at low cost. Further, the lid of the water storage tank is light-shielding and does not hit the rainwater in the tank, so that there is no fear that algae and the like are generated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a rainwater storage device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the device, and FIG. 3A is a view of a wall element used for a cylindrical container of a water storage tank of the device. FIG. 3B is a perspective view of a lowermost wall element used in the cylindrical container, FIG. 4 is an enlarged perspective view of an end of the wall element, and FIG. 5 is a circumferentially joined portion of the wall element. FIG. 6 is an enlarged sectional view of a vertically joined portion of the same wall element. FIG. 6A is a state before being bent inward, and FIG. This shows a later state. FIG. 7 is a partial perspective view showing a fastening structure of an open upper end of the water storage bag in the water storage tank.
FIG. 8 is a partial sectional view showing a fixing structure of the cylindrical container of the water storage tank.

In FIG. 1 and FIG. 2, T is a water storage tank, and this water storage tank T is installed on the ground 1.
Then, the water pipe 17 for introducing rainwater from the roof of the house or the agricultural and horticultural house into the water storage tank T is connected to the lid 4 of the water storage tank T.
And inserted into the tank. This water pipe 17
Preferably, a synthetic resin pipe having a diameter of about 100 mm is used. As shown in FIG. 2, it is preferable to connect a flexible tube 17a that hangs down to near the bottom of the water storage tank T to the tip of the water pipe 17 so as not to jump when rainwater flows.

In the vicinity of the water storage tank T, a bottomed cylindrical body 1 is provided.
8 is fixed to the water storage tank T so as not to fall down by the cylindrical support 18a. This tubular body 18 is
It is composed of a synthetic resin pipe having a diameter larger than 7, specifically 100 to 500 mm, preferably 150 mm
A pipe made of a vinyl chloride resin having a diameter of about 300 mm is preferably used. Since the cylindrical body 18 is for introducing and draining rainwater that starts to descend, it is preferable that the cylindrical body 18 has a somewhat large internal volume. For example, when the storage volume of the water storage tank T is 10 t, 150 to 200 liters is used. It is desirable to erect a cylinder having an internal volume of the order.

The lower end opening of the cylindrical body 18 is closed by attaching a bottom cover 18b in a watertight manner.
At the lower part of the cylindrical body 18, a water discharge port 18 capable of adjusting the water discharge amount is provided.
c is provided. Water outlet 18 with adjustable water discharge
As c, a tap for water supply is preferably used, and a known flow control valve or the like may also be used. The amount of water discharged from the water outlet 18c is adjusted in advance so that the amount of water discharged therefrom is smaller than the expected amount of rainwater flowing into the water storage tank T through the water conduit 17.

The upper end of the cylindrical body 18 is connected to the water pipe 17 by a joint 19. This joint 19 is a three-way opening joint (cheese joint) having connection ports 19a and 19b having small diameters on the upper side and the side and having a connection port 19c having a large diameter below.
The water pipe 17 is connected to 19b, and the upper end of the cylindrical body 18 is connected to the connection port 19c having a large diameter. And
A screen 21 for removing dust is also provided inside the side connection port 19b.

As described above, the upper end of the bottomed cylindrical body 18 is connected to the water pipe 17 and is adjusted in advance so that the amount of water discharged from the water outlet 18c at the lower part of the cylindrical body is smaller than the expected inflow of rainwater. If it is, the dirty rainwater that has started to descend flows from the water pipe 17 into the cylinder 18, and the amount of water flowing into the cylinder 18 and the discharge port 1
8c, the rainwater gradually flows into the cylinder 1
8, the water level inside the cylindrical body 18 rises. When a certain amount of time has passed since the descent and clean rainwater flows through the inlet pipe 17, the water level rises to the connecting portion at the upper end of the cylindrical body 18. It will flow into the tank T. Therefore, since only clean rainwater is stored in the water storage tank T, this rainwater can be effectively used for various uses.

Even if a long time has passed since the start of descending, dust such as dead leaves may mix with the rainwater and flow through the water pipe 17. Since the screen 21 for dust removal is provided inside, dust can be prevented from flowing into the water storage tank T.

The amount of water discharged from the water outlet 18c is, specifically, about 1/5 to 1/50 of the expected inflow, especially 1/10.
It is preferable to adjust to about 1/20. If the amount of discharged water is more than 1/5 of the expected inflow, the rise of the water level inside the cylindrical body 18 is delayed, so that the time until the rainwater starts flowing into the water storage tank T becomes longer, and The amount of inflow is also greatly reduced, thus increasing waste. On the other hand, if the amount of discharged water is less than 1/50 of the expected inflow, the rise of the water level inside the cylindrical body 18 becomes faster, so that the rainwater is stored in the water storage tank T.
The time required to start flowing into the storage tank T is shortened, and the possibility that dirty rainwater for which the time since the start of descending has not passed so much flows into the water storage tank T increases.

When the estimated inflow is substantially constant throughout the year, the water discharge port 18c is set to 1 / of the estimated flow.
A hole having a size that can provide a water discharge amount of about 5 to 1/50 may be simply formed in the side wall of the cylindrical body 18. The solid matter or the like accumulated on the bottom of the cylindrical body 18 may be removed by opening the bottom cover 18b. However, it is also possible to form an opening (not shown) for draining and remove the solid from the opening. Good.

Next, the water storage tank T of the rainwater storage device will be described.

This water storage tank T contains an impervious water storage bag 3 inside a cylindrical container 2 installed on the ground 1,
The lid 4 is attached to the upper end opening of the cylindrical container 2.

The cylindrical container 2 joins the metal wall elements 20 which are curved in an arc shape as shown in FIG. 3 (a) in the circumferential direction, and positions the wall elements 20 alternately by half in the circumferential direction. The container 2 is assembled by vertically displacing and vertically joining. The lowermost stage of the container 2 uses a wall element 21 shown in FIG. Each of these wall elements 20 and 21 is manufactured by bending a metal plate such as a zinc steel plate, an aluminum-plated steel plate, or a stainless steel plate having a thickness of about 0.4 to 1 mm which is easily bent at a construction site or in a factory. It was done.

That is, the wall element 20 shown in FIG.
Is formed by bending the upper and lower ends of a metal plate curved into an arc shape obtained by dividing the circumference into three parts at right angles outwardly, thereby forming an upper end flange portion 20.
a and the lower end flange portion 20b, respectively,
The distal ends of the flange portions 20a and 20b are further bent at a right angle downward, and a short hanging edge 20c having a short vertical dimension is provided at the distal end of the upper flange portion 20a, and a hanging edge 20d having a vertical dimension longer than the vertical edge 20c is provided at the lower flange portion. Each of the connecting pieces 20e is formed at the right end of the wall element 20 at right and left ends of the wall element 20 at right and left sides, as shown in FIGS.
A plurality of bolt insertion holes 20f are drilled in the connecting piece 20e.

The specific dimensions of the wall element 20 are not particularly limited, and may be appropriately determined in consideration of the size of the cylindrical container 2 to be assembled and the weight of the wall element. Container 2 has a diameter of 2.5 to
It is preferable that the radius of curvature of the wall element 20 is set to about 1.25 to 4.0 m and the vertical dimension is set to about 20 to 50 cm since a size of about 8.0 m is appropriate.

The wall element 21 shown in FIG. 3B, which is used at the lowermost stage of the cylindrical container 2, is formed by bending the upper end flange portion 21a and the front end thereof similarly to the wall element 20 shown in FIG. A short hanging edge 21c having a vertical dimension of
Wide lower end flange portion 21b and connecting pieces 21 at both left and right ends
e, 20e, but the lower end flange 2
FIG. 3B shows that no drooping edge is formed at the tip of FIG.
This is different from the wall element 20 of FIG.

As shown in FIG. 6 (a), the vertical joining of the wall element 20 is performed by connecting the lower end flange 20b of the upper wall element 20 to the upper end flange of the lower wall element 20. 6B, the lower portion of the hanging edge 20d of the lower end flange portion 20b is folded upward so that the hanging edge 20c of the upper end flange portion 20a is embraced, and further, as shown in FIG. It is performed by bending and crimping. The wall element 20 and the lowermost wall element 2
1 is also vertically joined in the same manner as described above.

As shown in FIG. 5, the wall elements 20 are joined in the circumferential direction by connecting bolts to the bolt insertion holes of the connecting pieces 20e of the wall elements 20 adjacent to each other in the circumferential direction. 5a are inserted and fastened with a nut 5b. Then, joining of the lowermost wall element 21 in the circumferential direction is performed in the same manner.

As described above, the cylindrical container 2 does not weld the wall elements 20 and 21 to each other in a watertight manner.
By simply bending the respective hanging edges 20c, 20d of the upper end flange portion 20a and the lower end flange portion 20b, and connecting and fixing the connecting pieces 20e, 20e with the bolts 5a and the nuts 5b, the wall elements 20, 2
1 is joined in the up-down direction and the circumferential direction, so that it can be assembled in a shorter time and at lower cost than in the case of welding in a watertight manner. Moreover, the wall element 2
Numerals 0 and 21 are three-divided arcuately curved elements, so that they can be statically fixed and retain the shape of the cylindrical container 2 similarly to the three-link mechanism, and have sufficient water pressure from the inside. It has enough strength to withstand.

As shown in FIGS. 1, 2, and 8, a plurality of foundation pipes 6 having a length of about 50 to 80 cm are buried in the ground 1 around the cylindrical container 2, and Mortar 7 is injected into the base pipe 6 and anchor bolts 8 are implanted. Then, the anchor bolt 8 is connected to the lower end flange portion 21b of the lowermost wall element 21.
The cylindrical container 2 is fixed to the ground 1 so that the cylindrical container 2 does not float up by being inserted into the bolt insertion hole and tightening with the nut 8a.

When the lower end of the cylindrical container 2 is fixed to the ground 1 with the anchor bolts 8 and the nuts 8a as described above, the earthquake resistance is improved, so that the cylindrical container 2 is hard to fall down even if an earthquake occurs, and even if a typhoon comes. No more worrying about falling due to wind pressure. In addition, since the anchor bolts 8 are obtained by injecting the mortar 7 into the foundation pipe 6 driven into the ground 1 and planting the same, for example, a concrete foundation is formed and the cylindrical container 2 is installed and fixed thereon. The construction is much easier than in other cases.

As shown in FIG. 2, a sand layer 9 is provided at the bottom of the cylindrical container 2 to adjust the height of the bottom surface without unevenness of the ground. A resin foam layer 10 and a felt layer 11 are laminated. The water storage bag 3 is placed on the protective layer.

Resin foam layer 10 laminated as protective layer
Has a certain degree of cushioning property, and since the felt layer 11 is rich in flexibility and neither of them has a projection or a point, the water storage bag 3 is placed on such a protective layer. When placed, even if a large water pressure is applied to the bottom of the water storage bag 3, the bottom surface of the water storage bag 3 is softly supported by the protective layer, and the bottom is prevented from being damaged. In the water storage tank T of this embodiment, both the resin foam layer 10 and the felt layer 11 are laminated as protective layers, but only one of the layers may be laminated.

The water storage bag 3 accommodated in the cylindrical container 2 is formed by heat-sealing the lower end of a cylindrical sheet having substantially the same diameter as the inner diameter of the cylindrical container 2 on the outer periphery of the circular bottom sheet. An impervious bag manufactured by fusion-sealing in a water-tight manner by means of high-frequency fusion, ultrasonic fusion or the like, having an inner volume substantially equal to the inner volume of the cylindrical container 2. I have.
Therefore, when rainwater is stored in the water storage bag 3, the water storage bag 3
Abuts against the inner peripheral surface of the cylindrical container 2 without any gap, and the pressure of rainwater is applied to the cylindrical container 2 via the water storage bag 3, so that there is no fear that the water storage bag 3 will burst due to water pressure.

As the material of the circular bottom sheet and the tubular sheet of the water storage bag 3, various synthetic rubber sheets such as EDPM and woven fabric are impregnated with synthetic resin such as polypropylene, polyvinyl acetate, polyvinyl chloride and nylon. Tarpaulin and the like are preferred, and those having a thickness of about 0.3 to 1.5 mm are particularly preferably used. Of course, synthetic resin blown films and lamination films are also used as long as they have sufficient strength. These films may be used in a stack of two films, and when such two films are stacked, there is an advantage that even if one film is torn, water leakage can be prevented by another film.

The open upper end of the water bag 3 is shown in FIG.
As shown in FIG. 7, the upper end of the opening of the cylindrical container 2, that is, the upper end flange portion 20a of the uppermost wall element 20 of the cylindrical container 2, is folded outward and downward, and the folded upper end of the water storage bag 3 is formed. Many eyelets 3b are formed in the part 3a.
Are formed at regular intervals. A number of eyebolts 12 are attached to the lower end flange portion 20b of the uppermost wall element 20 as wire holders, and the eyebolt 12 and the eyelet hole 3b have a high tensile strength such as a rope, a string, or a wire. The upper end 3a of the water storage bag 3 is fixed by alternately passing and tightening 13. When fixed in this manner, the risk that the open upper end 3a of the water storage bag 3 falls into the inside of the cylindrical container 2 and leaks water is eliminated. In addition, as the wire holder, other than the above-mentioned eye bolt 12, a hook bolt or the like that can securely hold the wire can be used.

On the other hand, inside the cylindrical container 2, an overflow pipe 14 is erected through the bottom of the water storage bag 3, and the upper end of the pipe reaches near the upper end opening of the cylindrical container 2. I have. Then, a drain pipe 15 connected to the lower end of the overflow pipe 14 is buried underground and drawn out. Therefore, when the water level of the rainwater stored in the water storage bag 3 exceeds the upper end of the overflow pipe 14,
Rainwater is drained to the outside through the overflow pipe 14 and the drain pipe 15 so as not to leak from the upper end opening of the cylindrical container 2 of the water storage tank T.

Further, an intake pipe 16 is connected to the bottom of the water storage bag 3 in a watertight manner as shown in FIG.
Is installed. In addition, the water storage bag 3 of this intake pipe 16
In the connection part with the short pipe 16b of about 5 to 15 cm in height
Is installed. Therefore, when the faucet 16a is opened, it is possible to take out the rainwater in the water storage bag 3 at any time, and when the water level drops to the upper end of the short pipe 16b, the rainwater extraction is automatically stopped. Even if solids or the like are deposited on the bottom, the solids are not mixed with the rainwater to be taken out, and only clean rainwater can be taken at all times.

In this embodiment, a drain pipe (not shown) is not connected to the bottom of the water storage bag 3, but it goes without saying that a drain pipe may be connected if necessary.

As shown in FIGS. 1 and 2, the lid 4 attached to the upper end opening of the cylindrical container 2 is made of a large number of metal members which extend obliquely downward from the upper end of the center column 4a. Of the frame pipe 4b and the light-transmissive sheet 4c placed thereon is a lid formed in the shape of a ginseng. The light-transmissive sheet 4c is lightweight and tough, which does not transmit light or rainwater. A suitable canvas is preferably used. The lid 4 is formed by using a bolt / nut (not shown) at the end of the frame pipe 4b to form the uppermost wall element 2 of the cylindrical container 2.
By being fixed to the upper end flange portion 20a of the cylindrical container 2, it is detachably attached to the upper end opening of the cylindrical container 2.

Such a cover 4 has a simple structure and can be manufactured at a low cost. The cover 4 can be easily attached to the upper end opening of the cylindrical container 2 and does not transmit light. Algae can be prevented from being generated in rainwater. In addition, besides the above-mentioned jinkasa shape, various shapes and structures such as a flat lid and a dome-shaped lid can be used as the lid.

Although the rainwater storage device of the present invention has been described in detail based on one embodiment, the present invention is not limited to the device of this embodiment.
Various changes can be tolerated, such as adopting a tank manufactured by joining FRP plates or a tank constructed of concrete or the like.

[0044]

As is apparent from the above description, the rainwater storage device of the present invention automatically discharges dirty rainwater or low-pH rainwater at the start of falling from the water outlet at the lower part of the cylindrical body, thereby producing a clean rainwater. Only water can be introduced into the water storage tank and stored. In addition, since the water storage tank is easily and inexpensively assembled, it is excellent in workability and economic efficiency. Many remarkable effects can be obtained, for example, the occurrence of the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rainwater storage device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the device.

FIG. 3A is a perspective view of a wall element used for a cylindrical container of a water storage tank of the apparatus, and FIG. 3B is a perspective view of a lowermost wall element used for the cylindrical container.

FIG. 4 is an enlarged perspective view of an end of the wall element.

FIG. 5 is an enlarged sectional view of a circumferentially joined portion of the wall element.

FIGS. 6A and 6B are enlarged cross-sectional views of a vertical joining portion of the wall element, in which FIG. 6A shows a state before being bent inward, and FIG. 6B shows a state after being bent inward. It is shown.

FIG. 7 is a partial perspective view showing a fastening structure of an open upper end of a water storage bag in a water storage tank of the same device.

FIG. 8 is a partial sectional view showing a fixing structure of a cylindrical container of the water storage tank.

[Explanation of symbols]

 T Water storage tank 2 Cylindrical container 20, 21 Wall element 3 Water storage bag 3a Upper open end of water storage bag 4 Lid 4c Opaque sheet 17 Water pipe 18 Cylindrical body 18b Bottom lid 18c Water discharge with adjustable water discharge Mizuguchi (faucet) 19 Fitting

Claims (2)

[Claims] 1. A bottomed cylindrical body is erected near a water storage tank,
A rainwater storage device characterized in that an upper end of a cylindrical body is connected to a water pipe for introducing rainwater into a water storage tank, and a water outlet capable of adjusting a water discharge amount is provided at a lower portion of the cylindrical body. 2. The water storage tank includes a cylindrical container assembled by joining a large number of metal wall elements curved in an arc shape in a vertical direction and a circumferential direction, and is housed inside the cylindrical container. The rainwater storage device according to claim 1, comprising an impervious water storage bag having an open upper end, and a light-shielding lid attached to an upper end opening of the cylindrical container.