JP5871730B2 - Water storage facility - Google Patents

Description

  The present invention relates to a storage water utilization facility that can temporarily store rainwater and infiltrate it into the ground, and can also store rainwater for water use.

  Conventionally, a facility having a permeation tank (storage permeation tank) capable of temporarily storing rainwater and allowing it to permeate into the ground and a storage tank (water utilization tank) capable of storing rainwater for water use has already been disclosed. (For example, refer to Patent Document 1).

  In the configuration of Patent Document 1, the storage tank is disposed inside the infiltration tank, and the overflow water of the rainwater in the storage tank is introduced into the infiltration tank through an overflow inflow pipe. With this configuration, rainwater can be stored in the storage tank first, and then the rainwater overflowing from the storage tank can be guided to the infiltration tank.

JP 2008-133598 A

  However, the above Patent Document 1 discloses only a configuration in which rainwater is first stored in a storage tank as described above, and then the rainwater overflowing from the storage tank is guided to the infiltration tank. There is no disclosure of a configuration that can guide rainwater to the tank and introduce rainwater that cannot be treated in the infiltration tank into the storage tank. In addition, impurities contained in the rainwater flowing into each tank can be appropriately removed by a filter that is a well-known technique, but it can preferentially guide rainwater to the infiltration tank and guide untreated rainwater to the storage tank. Regarding the configuration, an appropriate arrangement of the filter and a configuration that facilitates inspection and replacement of the filter have not been proposed yet. Moreover, since the structure disclosed in Patent Document 1 has a two-layer structure including an infiltration tank and a storage tank, it must be excavated deep in the ground in order to embed both tanks. There is a problem that the burden is large.

  Therefore, the present invention provides a storage water utilization facility that has both a storage permeation tank and a water-use tank, and that allows rainwater to flow in preferentially over one tank while appropriately removing impurities contained in the rainwater. For the purpose.

The present invention is a storage water utilization facility capable of temporarily storing rainwater and allowing it to penetrate into the ground, and storing rainwater for use as a water supply. The first tank and the second tank embedded in the ground has a bath, masu rainwater on top of the first tank is being provided, the bottom wall portion of該雨water masu, communicating the該雨water masu within the first tank A communication port is formed, and an inflow port for flowing rainwater into the rainwater is formed at least on the side wall portion of the rainwater at least above the communication port . An outflow port is formed in the side wall portion at a height between the communication port and the inflow port for allowing rainwater in the rainwater to flow out to the second tank, and further to the communication port. A first filter part that is permeable to rainwater passing through the communication port is disposed; Mouth, rainwater flowing into the tank of the second is disposed a second filter unit capable permeability is, the first tank has a storage space for temporarily storing the rainwater, the accumulating space reservoir impregnation vessel to infiltrate inflowing rain water into the ground, and is either one of the utilization water tank having a savings space for storing rainwater for the irrigation, the second vat, Ri and the other der, a reservoir water utilization facility to the first eye of the filter portion size and wherein Rukoto and size of the eyes of the second filter section are different.

  By adopting such a configuration, it becomes possible to preferentially guide the rainwater flowing into the rainwater to one of the tanks having different functions. At this time, impurities can be removed appropriately. Here, the first tank may be a storage and penetration tank, and the second tank may be a water-use tank. Conversely, the first tank may be a water-use tank and the second tank may be a storage and penetration tank. More specifically, the above configuration uses rainwater trough, and since the communication port, inflow port, and outflow port are respectively set at the above-mentioned height positions in the rainwater trough, the rainwater flowing into the rainwater trough is preferentially first. For example, when the amount of inflow to the rainwater is increased and the rainwater becomes full in the first tank, for example, the rainwater overflowing from the first tank is now passed through the outlet of the rainwater. To the second tank. At this time, impurities such as dead leaves contained in the rainwater about to flow into the first tank are removed by the first filter unit, and impurities contained in the rainwater about to flow into the second tank are: It is removed by the second filter unit. Therefore, for example, when the first tank is a storage and infiltration tank, the rainwater that has flowed into the rainwater mass is preferentially infiltrated into the ground while suppressing the clogging of the storage and infiltration tank by the first filter unit. it can. On the other hand, for example, when the first tank is a water utilization tank, rainwater for water utilization from which impurities are appropriately removed by the first filter unit is obtained preferentially. Note that either one of the first tank and the second tank may be an existing tank that is already buried in the ground. That is, the existing tank having only a single function is defined as the first tank (or the second tank), and another tank having a different function is newly added to the second tank according to the present invention. (Or the first tank) is also possible. In addition, when the rainwater basin is arranged in the upper part of the first tank, it functions as the rainwater basin and also functions as an inspection port for the first tank. For this reason, it becomes easy to perform maintenance management of the first tank. Moreover, the burden of excavation work at the time of installing this rainwater mass will also be reduced by arrange | positioning a rainwater mass in the upper part of a 1st tank.

  Further, the first tank is a storage and penetration tank, the second tank is a water-use tank, and the opening of the second filter unit is smaller than the opening of the first filter unit. A configuration that is set in this way is proposed.

  In the above configuration, when the first tank is full and rainwater overflowing from the first tank stays in the rainwater, the impurities once removed by the first filter section are contained in the rainwater. The dust is floated and rolled up, and such foreign substances try to pass through the outlet of the rainwater. However, since the opening of the second filter part is set to be smaller than the spread of the first filter part, the impurities on the first filter part are stored in the storage space of the water tank. It is reliably prevented that it flows into the water. The rainwater in the storage and permeation tank also contains particles such as silt. However, the rainwater in the storage and permeation tank almost sinks in the storage and permeation tank, and therefore hardly flows into the water utilization tank.

  By the way, in the above configuration, there are cases where there are conditions such as keeping the construction cost of the storage water utilization facility low, or if there are obstacles in the ground, the storage infiltration tank and the water utilization tank may not be buried deep underground. . Then, the total height of the rainwater can be installed is limited, the separation distance between the communication port and the outlet becomes smaller, and the arrangement becomes closer to each other, so that the foreign matter accumulated on the first filter section is increasingly at the outlet. The structure is easy to flow in. However, according to the structure concerning this invention, since the penetration | invasion of the foreign material to a water-use tank can be reliably prevented by the 2nd filter part, it can construct by making the embedding depth of a tank shallow.

  Further, in the above configuration, the upper surface portion of the rainwater basin is exposed on the ground surface, and an inspection port is provided on the upper surface portion to communicate the outside with the inside of the rainwater basin, and the second filter portion includes the rainwater basin. It is desirable to be disposed at the outlet of the gas.

  By adopting the above configuration, both the first filter part and the second filter part can be inspected or replaced through the inspection port for rainwater, so the maintenance work of the filter part is simplified, Work burden is reduced.

  The first tank is a water-use tank, and the second tank is a storage and penetration tank, wherein the first filter portion of the rainwater is exposed in a storage space, 1 filter part is good also as a structure which is a container shape.

  In the above configuration, the opening of the first filter portion is set so that rainwater passing through the communication port can be used, so that the smallest filter is selected. Therefore, the first filter part is likely to be clogged with accumulation of impurities and the like, and it is difficult to collect water for water use in a short period of time. For this reason, the problem that the maintenance of this 1st filter part becomes frequent may arise. However, since the first filter portion has the above-described shape, rainwater permeates from the side wall portion of the first filter portion that surrounds the bottom portion even if foreign matter or the like accumulates on the bottom portion of the first filter portion. Further, the rainwater that has permeated the water is dripped into the storage space along the surface of the filter unit. For this reason, the water permeation performance of the first filter portion can be maintained even longer. Further, in the first filter portion, when rainwater flows down from the inflow port, rainwater temporarily stays in the internal space of the first filter portion, whereby the first filter The foreign matter accumulated on the bottom of the part is agitated to promote the stirring of the foreign matter, and the clogging is temporarily eliminated. As described above, the present invention has a configuration in which the first filter portion is formed in a container shape, and a space in which rainwater tends to stay intentionally is formed on the inside thereof, thereby aiming at an effect of mixing impurities. It is intended to reduce the burden of maintenance work on the first filter unit by delaying the progress of clogging of the first filter unit. In addition, when the amount of rainwater flowing into the rainwater mass suddenly increases and the amount of water in the rainwater mass increases, the rainwater is guided to the storage infiltration tank through the above-mentioned outlet and appropriately infiltrated into the ground. be able to.

  Furthermore, an elbow pipe having a downstream pipe end facing downward is disposed at the rainwater inlet, and the downstream pipe end is arranged vertically above the first filter portion. desirable.

  By adopting the above-described configuration, it becomes possible to directly drop rainwater that has flowed into the rainwater onto the filter unit, and agitation of impurities accumulated on the first filter unit can be achieved by using an impact at the time of dropping. It can be further promoted.

  Moreover, the mud reservoir part in which the mud contained in the rainwater which passes this 1st filter part accumulates may be arrange | positioned at the lowest end of the said 1st filter part.

  By setting it as the said structure, it becomes possible to collect the foreign material deposited on the said 1st filter part in a mud pool part. The first filter portion has a container shape, and a mud pool portion is formed at the lowermost end thereof. Therefore, it is possible to efficiently collect and collect impurities and mud in the mud pool portion. .

  Moreover, the said 1st tank and the said 2nd tank are provided continuously in right and left, The inside of this 1st tank and the inside of this 2nd tank are partitioned off by the single partition wall. It is good also as a structure.

  By arranging the tanks having different functions adjacent to each other in this way, the depth for embedding the tank can be made as shallow as possible, and the storage water utilization facility can be saved in space. It becomes.

  The storage water utilization facility according to the present invention has an effect of allowing rainwater that has flowed into the rainwater to flow preferentially into one of the tanks having different functions while properly removing impurities.

Explanatory drawing of the storage water utilization facility concerning Example 1. FIG. Explanatory drawing which shows the flow of rainwater. Explanatory drawing of the storage water utilization facility concerning Example 2. FIG. Explanatory drawing of the storage water utilization facility concerning Example 3. FIG. FIG. 6 is an explanatory diagram showing the inside of the first filter according to the third embodiment. Explanatory drawing of the storage water utilization facility concerning Example 4. FIG. The longitudinal cross-sectional view which shows the other form of a 1st filter. Explanatory drawing which shows the flow of the rainwater in the storage water utilization facility concerning Example 5. FIG.

  Hereinafter, the Example which actualized the storage water utilization facility of this invention is described in detail.

[Example 1]
As shown in FIG. 1, the storage water utilization facility 1 </ b> A includes a storage penetration tank 30 </ b> A as a first tank and a water utilization tank 30 </ b> B as a second tank. The storage and penetration tank 30A has a storage space inside, and temporarily stores rainwater in the storage space, and gradually stores rainwater into the ground through a large number of penetration holes (not shown) formed in the peripheral wall. Can penetrate. On the other hand, the water utilization tank 30B has a storage space inside, and can store rainwater for water use.

  In addition, the storage and penetration tank 30A and the water-use tank 30B are continuously arranged side by side in a state of being buried in the ground, and the storage space of the storage and penetration tank 30A and the storage space of the water-use tank 30B Are separated by a single partition wall 31. Thereby, even if it is a case where the tank of a mutually different function is arrange | positioned adjacently, space saving of 1 A of storage water utilization facilities can be achieved. Moreover, the depth required for embedding each tank can be made as shallow as possible. In addition, a well-known technique can be employ | adopted suitably for each tank 30A, 30B.

  A first rainwater tank 10 is disposed above the storage and penetration tank 30A. More specifically, an inflow port 11 is formed in a side wall portion of the peripheral wall of the first rainwater mass 10, and an inflow pipe 12 is connected to the inflow port 11. The rainwater can flow into the first rainwater 10 through the inflow pipe 12. In addition, a communication port 13 for communicating the storage space of the storage and permeation tank 30 </ b> A and the inside of the first rainwater tank 10 is formed in the bottom wall portion of the peripheral wall of the first rainwater tank 10. A flat plate-like first filter 14 is attached to the communication port 13 so as to cover the communication port 13. In addition, the 1st filter part of this invention is comprised by this 1st filter 14 for removing the contaminant contained in the rainwater which is going to pass through this communicating port 13. FIG.

  Further, an outlet 15 is formed in a peripheral wall of the first rainwater tank 10 at a position above the communication port 13 and at a position below the inlet 11. One end of the relay pipe 17 is connected to the outlet 15. A dome-shaped second filter 16 is attached to the outflow port 15 in the first rainwater trough 10 so as to cover the outflow port 15. In addition, the 2nd filter part of this invention is comprised by the 2nd filter 16 for removing the contaminant contained in the rainwater which is going to pass through this outflow port 15. FIG.

  Further, the opening of the second filter 16 is set to be smaller than the opening of the first filter 14. The mesh opening is a so-called mesh size defined based on the size of a foreign substance that can pass through the filter, and is a known index represented by a numerical value having a unit of mm, for example.

  An inspection port 18 exposed to the ground surface is formed at the upper end of the first rainwater trough 10, and a lid 19 is attached to the inspection port 18.

  In addition, a second rainwater tank 20 is disposed on the water tank 30B. An inlet 21 is formed in a side wall portion of the peripheral wall of the second rainwater mass 20, and the other end of the relay pipe 17 is connected to the inlet 21. The rainwater can flow into the second rainwater 20 through the relay pipe 17. Similarly to the first rainwater tank 10, the bottom wall of the second rainwater tank 20 has a communication port 22 for communicating the storage space of the water tank 30B and the inside of the second rainwater tank 20. Is formed. Further, an inspection port 23 to which a cover 24 is attached is formed at the upper end of the second rainwater trough 20.

  In addition, the second rainwater tank 20 is provided with a pump 25 for pumping rainwater in the storage space so that rainwater in the water-saving tank 30B can be used. In addition, a tap water supply pipe 26 is connected to the water utilization tank 30B, so that tap water can be supplied to the storage space.

  In the above-described storage water utilization facility 1A, when rainwater collected from a gutter of a building flows into the first rainwater trough 10 through the inflow pipe 12, the rainwater is first provided at the bottom of the first rainwater trough 10. It passes through the communication port 13 and is introduced into the storage and penetration tank 30A. At this time, the impurities contained in the rainwater trying to pass through the communication port 13 are captured by the first filter 14. And the rainwater in the storage penetration tank 30A which passed this 1st filter 14 is discharged | emitted gradually in the ground. In this way, since the contaminants are removed by the first filter 14, clogging of the storage and penetration tank 30A is suppressed.

  As shown in FIG. 2, if a large amount of rainwater flows into the first rainwater trough 10 through the inflow pipe 12 and the storage and penetration tank 30A is full, the rainwater overflowing from the storage and penetration tank 30A The first rainwater starts to stay in 10. When the amount of stagnation rainwater reaches the outlet 15, the rainwater in the first rainwater 10 starts to be introduced into the water utilization tank 30 </ b> B through the outlet 15. Here, when rainwater stays in the first rainwater tank 10, the foreign matter once removed by the first filter 14 and accumulated on the first filter 14 floats and winds up in the first rainwater tank 10. Therefore, such impurities pass through the outlet 15 and try to flow to the water utilization tank 30B. Here, the rainwater stored in the water-saving tank 30B is required to further remove impurities compared to the rainwater introduced into the storage and penetration tank 30A. In this embodiment, since the opening of the second filter 16 disposed at the outlet 15 is set to be smaller than the spread of the first filter 14, it is removed by the first filter 14. It is reliably prevented that the contaminated waste flows into the storage space of the water utilization tank 30B. Therefore, for example, when the storage and penetration tank 30A and the water-use tank 30B cannot be buried deep in the ground, the total height of the first rainwater tank 10 is limited, so that the distance between the communication port 13 and the outlet 15 is reduced. Thus, the foreign matter accumulated on the first filter 14 is likely to flow into the outlet 15, but it is possible to reliably prevent the foreign matter from entering the water utilization tank 30 </ b> B. The rainwater in the storage and permeation tank 30A also contains particles such as silt. However, the rainwater almost sinks in the storage and permeation tank 30A and therefore hardly flows into the water utilization tank 30B.

  By the way, the dome-shaped second filter 16 protruding toward the central axis of the first rainwater mast 10 is disposed vertically above the first filter 14. Therefore, when the foreign matter captured by the second filter 16 is peeled off from the second filter 16, it falls on the first filter 14. For this reason, the foreign substance once captured by the first filter 14 can be deposited again on the first filter 14, and the foreign substance can be prevented from being scattered in the first rainwater 10.

  As described above, since the communication port 13, the inflow port 11 and the outflow port 15 are set at the above-described height positions in the first rainwater trough 10, the rainwater flowing into the first rainwater trough 10 is communicated. The rainwater overflowing from the storage and permeation tank 30A is passed through the outlet 15 only when the amount of inflow into the first permeation tank 10A is increased through the port 13 preferentially. To the water tank 30B. At this time, since the inflow port 11 is disposed at a position higher than the outflow port 15, it is possible to prevent rainwater from flowing back to the inflow port 11. It should be noted that the dimensions, orientation, or location of the communication port 13, the inlet 11, and the outlet 15 are appropriately designed within a range that does not hinder the flow of rain water based on the priority order as described above. It can be changed. For example, by setting the upper end of the communication port 13 to be lower than the lower end of the outflow port 15, rainwater preferentially flows into the communication port 13. In addition, by adopting a configuration in which the lower end of the inflow port 11 is higher than the upper end of the outflow port 15, rainwater can preferentially flow into the outflow port 15, and the rainwater can be prevented from flowing back into the inflow port 11.

  The maintenance work of the storage and permeation tank 30A can be performed through the inspection port 18 of the first rainwater tank 10. In addition, the maintenance work of the first filter 14 and the second filter 16 mounted in the first rainwater trough 10 can be performed at once through the inspection port 18 of the first rainwater trough 10.

[Example 2]
A storage water utilization facility 1B according to Example 2 will be described with reference to FIG. However, description of parts common to the first embodiment is simplified or omitted, and the same reference numerals are given in the drawings.

  The storage water utilization facility 1A of the first embodiment is composed of a single storage permeation tank 30A and a water utilization tank 30B, but the water utilization tank 30B as the second tank is configured as shown in FIG. It is good also as a structure to which auxiliary water tank 30C is connected auxiliary. Specifically, an auxiliary rainwater tank 40 is disposed on the upper part of the auxiliary water tank 30C, and the second rainwater tank 20 and the auxiliary rainwater tank 40 are connected via a pipe. By setting it as this structure, the amount of water savings can be increased as a whole.

Example 3
A storage water utilization facility 1C according to Example 3 will be described with reference to FIG. However, description of parts common to the first and second embodiments is simplified or omitted, and the same reference numerals are given in the drawings.

  As shown in FIG. 4, the storage water utilization facility 1 </ b> C includes a water utilization tank 30 </ b> B as a first tank and a storage penetration tank 30 </ b> A as a second tank.

  A first rainwater tank 10 is disposed at the upper part of the water basin 30B, and a first filter 54 is disposed at the communication port 13 formed in the bottom wall portion of the peripheral wall of the first rainwater tank 10. ing.

  As shown in FIG. 5, the first filter 54 has a container shape having a bottom portion 56 </ b> A having a flat bottom shape and a side wall portion 56 </ b> B rising from the peripheral edge of the bottom portion 56 </ b> A, and is attached to the communication port 13. A number of meshes (not shown) on the outer surface of one filter 54 are exposed in the storage space of the water-saving tank 30B.

  Further, an elbow pipe 55 having a downstream pipe end facing downward is disposed in the inlet 11 formed in the peripheral wall of the first rainwater tank 10 in the first rainwater tank 10. The pipe end on the downstream side of the elbow pipe 55 is disposed substantially vertically above the first filter 54.

  Furthermore, one end of a relay pipe 17 is connected to the outlet 15 formed in the first rainwater trough 10, and the other end of the relay pipe 17 is disposed on the upper part of the storage permeation tank 30A. It is connected to 20 inflow ports 21 of rainwater.

  In the above configuration, when rainwater flows into the first rainwater trough 10, the rainwater is first introduced into the water tank 30B through the communication port 13. Contaminants contained in the rainwater that is about to pass through the communication port 13 are removed by the first filter 54. Here, the opening of the first filter 54 is selected as small as possible in order to store rainwater suitable for water use. Therefore, the first filter 54 is likely to be clogged in a short period. However, since the first filter 54 has the above-described shape, as shown in FIG. 5, even if foreign matter accumulates in the entire bottom portion 56A of the first filter 54, the first filter 54 has a mesh shape of the side wall portion 56B that surrounds the bottom portion 56A. Rainwater permeates to the outside, and the permeated rainwater is dripped into the water utilization tank 30 </ b> B along the outer surface of the first filter 54. Further, when rainwater falls from the inlet 11 of the first rainwater mass 10, rainwater temporarily stays in the internal space surrounded by the side wall portion 56 </ b> B of the first filter 54. Contaminants accumulated on the bottom portion 56A of the filter 54 are agitated, stirring of the impurities is promoted, and clogging is temporarily eliminated. Furthermore, since the elbow pipe 55 is disposed, rainwater that has flowed into the first rainwater mass 10 falls directly onto the first filter 54, and on the first filter 54 using the impact at the time of dropping. Agitation of the accumulated impurities can be further promoted.

  For example, when the amount of rainwater suddenly increases and the amount of water in the first rainwater trough 10 increases, the rainwater is guided to the storage and penetration tank 30A through the outlet 15 of the first rainwater trough 10 and appropriately It is discharged into the ground. The opening of the second filter 16 may be larger than the spread of the first filter 54.

Example 4
A storage water utilization facility 1D according to Example 4 will be described with reference to FIG. However, description of parts common to the first to third embodiments is simplified or omitted, and the same reference numerals are given in the drawings.

  The storage water utilization facility 1C of Example 3 is composed of a single storage infiltration tank 30A and a water utilization tank 30B, but, as shown in FIG. 6, the water utilization tank 30B as the first tank On the other hand, it is good also as a structure to which another auxiliary water tank 30C is connected. In particular, the configuration shown in FIG. 6 is in the first rainwater tank 10, and the auxiliary outlet 61 connected to the auxiliary water tank 30 </ b> C is disposed below the outlet 15, and is stored as a second tank. The piping structure is such that rainwater flows into the auxiliary water-saving tank 30C in preference to the infiltration tank 30A. By setting it as this structure, the amount of water savings can be increased as a whole.

  Further, as shown in FIG. 7, the first filter 54 in the third and fourth embodiments has a cylindrical mud reservoir 57 in which mud contained in rainwater passing through the first filter 54 is accumulated at the lowermost end. It may be arranged. With the above-described configuration, it is possible to collect the foreign matter accumulated on the first filter 54 in the mud reservoir 57, and the maintenance work of the first filter 54 is simplified. The shape of the first filter 54 may be any other shape as long as it is a container shape, may be a hemispherical dome shape arranged so as to protrude downward, or may protrude downward. It may be a conical shape arranged so as to be.

  In the first to fourth embodiments, the second filter 16 is preferably configured to be attached to the outlet 15 of the first rainwater mast 10 from the viewpoint of ease of maintenance, but the intrusion of impurities into the second tank. If the condition that it can be prevented is satisfied, it may be disposed at any position from the outlet 15 to the second tank.

Example 5
A storage water utilization facility 1E according to Example 5 will be described with reference to FIG. However, description of parts common to the first to fourth embodiments is simplified or omitted, and the same reference numerals are given in the drawings.

  As shown in FIGS. 8a and 8b, the storage water utilization facility 1E includes a storage permeation tank 30A as a first tank and a water utilization tank 30B as a second tank. Further, a first rainwater trough 10 having at least a communication port 13 and an outlet 15 is disposed on the upper portion of the storage and penetration tank 30A. An elbow pipe 60 connected to the outlet 15 is disposed in the first rainwater trough 10. More specifically, the upper pipe end of the elbow pipe 60 is connected to the outlet 15, while the lower pipe end of the elbow pipe 60 faces vertically downward, and the communication port 13 is in close contact with the upper surface of the first filter 14 disposed on the first filter 14. As a result, the internal space of the elbow pipe 60 and the internal space of the first rainwater tank 10 are blocked by the peripheral wall of the elbow pipe 60. A second filter 16 is also disposed at the outlet 15.

  In this configuration, as shown in FIG. 8a, when rainwater flows into the first rainwater tank 10, the rainwater flows through the communication port 13 and flows into the storage and penetration tank 30A. Further, the foreign matter contained in the rainwater that is about to pass through the communication port 13 is captured by the first filter 14. Naturally, since the contaminant cannot enter the elbow pipe 60, the contaminant does not accumulate in the region of the upper surface of the first filter 14 surrounded by the lower pipe end of the elbow pipe 60. Then, as shown in FIG. 8 b, when a large amount of rainwater flows into the first rainwater tank 10 and rainwater overflows from the storage and penetration tank 30 </ b> A, the rainwater flows into the first rainwater via the communication port 13. It will be divided into one that overflows into 10 and the one that overflows into the elbow pipe 60. Here, as described above, since impurities do not accumulate in the region of the upper surface of the first filter 14 surrounded by the lower end of the elbow pipe 60, the elbow pipe 60 passes through the first filter 14 upward. The rainwater that has entered inside is guided to the water utilization tank 30B without containing impurities on the first filter 14. By adopting such a configuration, it is possible to prevent foreign matters on the first filter 14 from adhering to the second filter 16, so that the maintenance burden on the second filter 16 can be reduced.

  Moreover, in Examples 1-5, the existing tank already embed | buried in the ground may be sufficient as either one among a 1st tank and a 2nd tank. That is, at the time of construction, the existing tank having only a single function is used as the first tank (or the second tank), and another tank having a different function is newly added to the second tank. (Or the first tank) is also possible. Of course, the first tank and the second tank may be disposed at a suitable distance.

  Moreover, the 1st filter 14,54 and the 2nd filter 16 may be comprised by the above commercial products, and it is by the slit integrally formed by the communicating port 13 or the outflow port 15 of rainwater masu 10. It may be configured.

  In addition, when the first rainwater trough 10 is configured using ready-made products, the first rainwater drainage is in a state where the lower end of the first rainwater trough 10 is inserted into the storage and permeation tank 30A or the water use tank 30B. 10 may be disposed above the tanks 30A and 30B. By setting it as this structure, since the total height of the 1st rainwater mast 10 protruded upward from this tank 30A, 30B becomes low compared with the case where it arrange | positions without inserting, storage water utilization facilities 1A-1D are made. There is an advantage that the depth for burial becomes shallower and the amount of excavation decreases as a whole.

1A to 1E Reservoir Water Use Facility 10 First Rainwater Mass 11 Inlet 13 Communication Ports 14, 54 First Filter (First Filter Unit)
15 Outflow port 16 Second filter (second filter part)
18 Inspection port 30A Storage and permeation tank 30B Water utilization tank 31 Partition wall 55 Elbow pipe 57 Mud reservoir

Claims (7)

A storage water utilization facility that can temporarily store rainwater and infiltrate it into the ground, and can also store rainwater for water use.
A first tank which is buried in the ground and a second tank, but Masu rainwater is disposed on top of the first vessel, the bottom wall portion of該雨water masu, the A communication port is formed to allow communication between the rainwater masu and the first tank.
In addition, an inflow port through which rainwater flows into the rainwater mass is formed at a side wall portion of the rainwater mass, at least above the communication port.
An outflow port is formed in a side wall portion of the rainwater at a height between the communication port and the inflow port, and the rainwater in the rainwater is discharged to the second tank;
Further to the communication port, rainwater passing through the communicating port with the first filter unit capable permeability is disposed, the outlet port, a second rainwater which can permeable to flow in a bath of second The filter part is arranged,
The first tank has a storage space for temporarily storing rainwater, a storage penetration tank for allowing rainwater flowing into the storage space to penetrate into the ground, and a water storage tank having a storage space for storing rainwater for water use and either one of the second vat, the other one der is, a feature that you have different sizes of the eyes of the first filter portion and the size of the eye of the second filter section Reservoir water use facility. The first tank is a storage permeation tank, the second tank is a water utilization tank,
The storage water utilization facility according to claim 1, wherein the opening of the second filter part is set to be smaller than the opening of the first filter part.   The upper surface portion of the rainwater basin is exposed on the ground surface, and an inspection port is provided on the upper surface portion to allow communication between the outside and the inside of the rainwater basin, and the second filter portion is disposed at the outlet of the rainwater basin. The storage water utilization facility according to claim 2, which is provided. The first tank is a water-use tank, and the second tank is a storage and penetration tank,
A first filter portion of the rainwater is exposed in the storage space;
The storage water utilization facility according to claim 1, wherein the first filter portion has a container shape.   5. An elbow pipe with a downstream pipe end facing downward is disposed at the rainwater inflow port, and the downstream pipe end is disposed vertically above the first filter portion. The storage water utilization facility described.   The storage water utilization facility according to claim 4 or 5, wherein a mud reservoir part in which mud contained in rainwater passing through the first filter part is deposited is disposed at a lowermost end of the first filter part. . The first tank and the second tank are continuously provided on the left and right,
The water storage facility according to any one of claims 1 to 6, wherein the inside of the first tank and the inside of the second tank are partitioned by a single partition wall.

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