JP4347364B2 - Permeation promotion storage facility - Google Patents

Description

  The present invention relates to an infiltration promoting storage facility that stores, for example, a liquid such as rainwater that has flowed down from the ground, and infiltrates the stored liquid into the ground and flows it out to a sewer pipe.

Conventionally, in urban areas and the like, a drainage system for draining rainwater to a sewer network has been established as a facility for reducing inundation damage caused by a large amount of rainwater when heavy rain with a high rainfall intensity occurs.
In addition, for example, for heavy rain exceeding the drainage capacity of the sewer network, generally, rainwater exceeding the drainage capacity is stored in a storage facility provided in the ground out of a large amount of rainwater that has fallen during heavy rain. There is a storage and infiltration facility.

The storage and infiltration facility having such a configuration is configured by, for example, osmosis and storage infiltration basins arranged in each basin door, a side ditch of a road, and the like. Measures are taken.
However, for example, as shown in FIG. 10, it is difficult to take rainwater as planned and drain it into a sewer pipe network in a terrain having a steep terrain such as a lowland or a depression surrounded by a high ground. . For this reason, there is a possibility that rainwater will accumulate in an area lower than the other parts and cause inundation, and such a geographically disadvantageous area is an inundation area. In addition, FIG. 10 is a figure which shows one form of the inundation phenomenon in a city.

  Therefore, it is considered effective to take spot measures for areas lower than other parts, such as depressions, as an effective countermeasure against inundation against a large amount of rainwater. In many cases, only small-scale facilities can be installed as storage countermeasures due to site restrictions in urban areas. This may cause a problem that it is difficult to satisfy a necessary scale.

In order to solve such a problem, for example, as described in Patent Document 1, rainwater flowing down from the ground is stored in a storage facility provided in the ground and stored and infiltrated into the ground. Facilities are proposed.
JP 2006-322148 A (FIG. 1)

  However, the conventional storage and infiltration facilities including the storage and infiltration facility described in Patent Document 1 described above are configured in consideration of the infiltration treatment near the ground surface, so that the soil near the ground surface is saturated during rainfall. In such a case, there may be a problem that sufficient penetration ability cannot be obtained. In addition, when the groundwater level of the topsoil layer rises in the soil near the ground surface, there may be a problem that sufficient water level difference necessary for rainwater infiltration cannot be obtained and sufficient infiltration capacity cannot be obtained. is there.

Also, in rainy conditions where there are multiple peaks of rainfall intensity in a relatively short period of time, such as heavy rain that occurs continuously, seepage of rainwater stored in the first raindrop to the ground surface or to the sewer network Since it takes time to drain the water, it is difficult to perform a sufficient function as a storage facility when the next peak occurs in a state where the storage capacity has not recovered.
The present invention has been made paying attention to the problems as described above, and provides an infiltration-promoting storage facility capable of improving the infiltration capability of stored rainwater into the ground and capable of early recovery of the storage capability. This is the issue.

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention is an infiltration-promoting type storage that stores liquid that is disposed in the ground and flows down from the ground, and infiltrates and flows out into the sewer pipe. A facility,
An initial treatment tank capable of storing liquid flowing down from the ground and communicating with the sewer pipe, a high water level maintenance tank into which liquid overflowing from the initial treatment tank flows, and a liquid overflowing from the high water level maintenance tank And a permeation means for causing the liquid in the high water level maintenance tank to flow through the water permeable layer below the impermeable layer below the permeation promoting storage facility. is there.

According to the present invention, the infiltration means allows the liquid in the high water level maintenance tank to flow into the water permeable layer below the impermeable layer below the permeation promoting storage facility, and therefore overflows from the initial treatment tank. The liquid that has exited and flowed into the high water level maintenance tank can be allowed to descend from the high water level maintenance tank to the permeable layer and permeate.
For this reason, it is possible to allow the liquid overflowing from the initial treatment tank and flowing into the high water level maintenance tank to descend from the high water level maintenance tank and permeate into the permeable layer, thereby improving the permeation treatment capacity of the permeation promoting storage facility. As well as an early recovery of storage capacity.

According to the present invention, the permeation promoting storage facility includes a high water level maintenance tank into which liquid overflowing from the initial treatment tank flows, and a storage tank into which liquid overflowing from the high water level maintenance tank flows.
For this reason, in the space where the permeation promoting storage facility is arranged, the volume of the storage tank is increased, that is, the volume of the high water level maintenance tank is decreased, so that the liquid flowing in from the initial treatment tank is allowed to flow into the high water level maintenance tank. In this case, the water level can be increased in a short time, and the water level difference between the liquid level in the high water level maintenance tank and the groundwater level of the permeable layer can be maintained at a high level.

The volume of the high water level maintenance tank refers to, for example, the permeability of the water permeable layer (the ease of liquid passage) through which the liquid descending from the high water level maintenance tank penetrates, the amount of liquid expected to flow down from the ground, etc. Calculate the amount of liquid that permeates into the permeable layer according to the field conditions of the place where the accelerated storage facility is installed, and the minimum volume that can be installed with a permeation means of scale (number, etc.) according to this amount It is preferable to do.
In addition, according to the present invention, since the permeable layer into which the liquid descending from the high water level maintenance tank permeates exists below the impermeable layer below the infiltration promoting storage facility, the groundwater level of this permeable layer is It is possible to keep the water level difference between the liquid level in the high water level maintenance tank and the groundwater level of the permeable layer at a high level.

Next, the invention described in claim 2 is the invention described in claim 1, wherein the infiltration means is a hollow member that communicates the high water level maintenance tank and the water permeable layer. Is.
According to the present invention, since the infiltration means is a hollow member that connects the high water level maintenance tank and the water permeable layer, the liquid overflowing from the initial treatment tank and flowing into the high water level maintenance tank moves inside the hollow member. Then, it descends from the high water level maintenance tank to the permeable formation and penetrates.
For this reason, the liquid in a high water level maintenance tank can be made to flow directly into a water-permeable layer with a large water permeability, which is suitable as a permeation destination for infiltrating the liquid in the high water level maintenance tank.

Next, the invention described in claim 3 is the invention described in claim 1 or 2, wherein the liquid is allowed to move from the storage tank to the high water level maintenance tank, and from the high water level maintenance tank. A storage tank side movement permitting means for restricting the movement of the liquid to the storage tank;
The storage tank side movement permitting means allows liquid to move from the storage tank to the high water level maintenance tank when the water level in the storage tank is higher than the water level in the high water level maintenance tank. It is what.
According to the present invention, when the liquid is present in the storage tank, the water level of the liquid in the high water level maintenance tank is lowered, and the water level in the storage tank is higher than the water level in the high water level maintenance tank, The liquid in the storage tank moves to the high water level maintenance tank.

For this reason, even if the liquid in a high water level maintenance tank falls to a permeable layer, and the water level in a high water level maintenance tank falls, the water level of the liquid in a high water level maintenance tank will become a high water level in a short time. In addition, since the liquid in the high water level maintenance tank can be efficiently lowered from the high water level maintenance tank to the water permeable formation while being maintained at a high water level, the infiltration treatment of the infiltration promoting storage facility Capability can be improved.
Further, according to the present invention, it becomes possible to automatically move the liquid in the storage tank to the high water level maintenance tank according to the state of the water level of the storage tank and the high water level maintenance tank. It is possible to move efficiently to the high water level maintenance tank.

Next, the invention described in claim 4 is the invention described in any one of claims 1 to 3, and allows movement of liquid from the high water level maintenance tank to the initial treatment tank, And the high water level maintenance tank side movement permission means for restricting the movement of the liquid from the initial treatment tank to the high water level maintenance tank,
The movement permitting means on the high water level maintenance tank side allows movement of liquid from the high water level maintenance tank to the initial treatment tank when the water level in the high water level maintenance tank is higher than the water level in the initial treatment tank. It is characterized by doing.
According to the present invention, when the liquid is present in the high water level maintenance tank and the water level in the high water level maintenance tank is higher than the water level in the initial treatment tank, the liquid in the high water level maintenance tank is transferred to the sewer pipe. Moving.
For this reason, it becomes possible to automatically move the liquid in the high water level maintenance tank to the initial treatment tank according to the state of the water level in the high water level maintenance tank and the initial treatment tank. It becomes possible to move to the initial treatment tank efficiently.

Next, the invention described in claim 5 is the invention described in any one of claims 1 to 4, wherein at least one of the initial treatment tank, the high water level maintenance tank, and the storage tank. Is characterized in that at least a part of the bottom part has a permeation part capable of permeating the liquid in the tank into the water permeable layer in which the permeation promoting storage facility is arranged.
According to the present invention, at least one of the initial treatment tank, the high water level maintenance tank, and the storage tank permeates the liquid in the tank into the permeable layer in which the permeation promoting storage facility is disposed at least at a part of the bottom. It has a possible penetration part.
For this reason, it is possible to efficiently infiltrate the liquid in the tank into the water permeable layer, and it is possible to recover the storage capacity of the permeation promoting storage facility in a short time.

  According to the present invention, the liquid in the high water level maintenance tank can be allowed to descend and permeate into the water permeable layer existing below the impermeable layer below the permeation promoting storage facility. It is possible to improve the penetration ability into the ground, and it is possible to quickly recover the storage capacity.

Next, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the present embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a diagram showing the concept of the configuration of a permeation promoting storage facility 1 according to this embodiment.
As shown in FIG. 1, the infiltration promoting storage facility 1 of the present embodiment is disposed in the ground (specifically, in the topsoil layer 2 which is a permeable stratum), and the mud reservoir 4 and the initial stage A treatment tank 6, a high water level maintenance tank 8, and a storage tank 10 are provided.

The mud reservoir 4 is, for example, disposed below the grating 12 formed on the ground surface (road surface or the like), and is disposed at a position where the liquid flows down from the ground.
The mud reservoir 4 is provided with a mud reservoir side partition 14 that separates the mud reservoir 4 from the initial treatment tank 6. The height of the mud pool side bulkhead 14 from the bottom surface of the mud pool 4 is accumulated on the ground surface, which is contained in the liquid flowing down from the ground, particularly in the outflow water flowing on the road surface etc. at the beginning of rainfall. It is set to a height corresponding to the amount of stored mud, organic matter, heavy metal and other contaminants in the mud pool 4.

The initial treatment tank 6 is liquid that has overflowed from the mud reservoir 4, specifically, liquid that has moved from the inside of the mud reservoir 4 to the initial treatment tank 6 side beyond the upper end of the mud reservoir-side partition wall 14. Is arranged at a position to flow into the inside. The bottom surface of the initial treatment tank 6 is lower than the bottom surface of the mud reservoir 4.
Further, the initial processing tank 6 includes an initial processing tank side partition wall 16 and an initial processing tank side movement permitting means 18.
The initial treatment tank side partition wall 16 is disposed below the mud pool basin side partition wall 14 and is formed continuously with the mud pool basin side partition wall 14. The initial treatment tank side partition 16 separates the sewage pipe 20 and the initial treatment tank 6 communicating with a sewer pipe network (not shown), and communicates the initial treatment tank 6 and the sewage pipe 20 at the lower end thereof. An initial treatment tank side communication hole 22 is formed. The sewer pipe 20 is disposed below the bottom surface of the mud reservoir 4 in the topsoil layer 2.

The initial treatment tank side movement permitting means 18 is attached to the vicinity of the upper end of the initial treatment tank side communication hole 22 in the initial treatment tank side partition wall 16 and disposed at the lower end of the initial treatment tank side partition wall 16. In the present embodiment, as an example, a case will be described in which the initial treatment tank side movement permitting means 18 is formed by a flap valve that opens and closes only in one direction.
Further, the initial treatment tank side movement permitting means 18 is in a state in which the initial treatment tank side communication hole 22 is opened in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, and the initial treatment tank 6. And the sewage pipe 20 are in communication with each other to allow the liquid to move from the initial treatment tank 6 to the sewage pipe 20.

On the other hand, the initial treatment tank side movement permitting means 18 is the initial treatment tank in a state where the water pressure in the initial treatment tank 6 does not exceed the water pressure in the sewer pipe 20 such as a state where the drainage capacity of the sewer pipe network is reduced. The side communication hole 22 is closed, and the movement of the liquid from the sewage pipe 20 to the initial treatment tank 6 is restricted to prevent the liquid from flowing from the initial treatment tank 6 to the sewage pipe 20.
In the state where the liquid outflow from the initial treatment tank 6 to the sewer pipe 20 is prevented, the liquid overflowing from the mud reservoir 4 is stored in the initial treatment tank 6.

The high water level maintenance tank 8 is a liquid overflowing from the initial treatment tank 6, specifically, from the inside of the initial treatment tank 6 to the high water level maintenance tank 8 side beyond the upper end of a high water level maintenance tank side partition wall 24 described later. The liquid that has moved to is disposed at a position where it flows into the interior thereof.
The volume of the high water level maintenance tank 8 is the place where the infiltration promoting storage facility 1 is installed, such as the water permeability (ease of liquid) of the gravel layer 34 described later and the amount of liquid expected to flow down from the ground. The amount of liquid to be infiltrated into the gravel layer 34 is calculated according to the on-site conditions, and the later-described infiltration means 28 having a scale (number, etc.) corresponding to this amount is set to the minimum installable volume. The bottom surface of the high water level maintenance tank 8 is higher than the bottom surface of the initial treatment tank 6.

The high water level maintenance tank 8 includes a high water level maintenance tank side partition wall 24, a high water level maintenance tank side movement allowing means 26, and an infiltration means 28.
The high water level maintenance tank side partition 24 divides the initial treatment tank 6 and the high water level maintenance tank 8, and the lower end thereof has a high water level maintenance tank side communicating with the high water level maintenance tank 8 and the initial treatment tank 6. A communication hole 30 is formed. That is, the high water level maintenance tank side communication hole 30 is arranged at a position higher than the initial treatment tank side communication hole 22.

The height of the high water level maintenance tank side partition wall 24 from the bottom surface of the initial treatment tank 6 is lower than the height of the mud pool dredge side partition wall 14 from the bottom surface of the initial treatment tank 6.
The high water level maintenance tank side movement permitting means 26 is mounted near the upper end of the high water level maintenance tank side communication hole 30 in the high water level maintenance tank side partition wall 24 and is arranged at the lower end of the high water level maintenance tank side partition wall 24. Yes. In the present embodiment, as in the case of the initial treatment tank side movement allowance means 18, a case where the high water level maintenance tank side movement allowance means 26 is formed by a flap valve that opens and closes only in one direction will be described as an example.

The high water level maintenance tank side movement permitting means 26 is in a state in which the high water level maintenance tank side communication hole 30 is opened when the water level in the high water level maintenance tank 8 is higher than the water level in the initial treatment tank 6. The water level maintenance tank 8 and the initial treatment tank 6 are communicated with each other to allow the liquid to move from the high water level maintenance tank 8 to the initial treatment tank 6.
On the other hand, when the water level in the high water level maintenance tank 8 is equal to or lower than the water level in the initial treatment tank 6, the high water level maintenance tank side movement permitting means 26 is in a state where the high water level maintenance tank side communication hole 30 is closed. The movement of the liquid from the treatment tank 6 to the high water level maintenance tank 8 is regulated to prevent the liquid from flowing from the high water level maintenance tank 8 to the initial treatment tank 6.

In the state where the liquid outflow from the high water level maintenance tank 8 to the initial treatment tank 6 is prevented, the liquid overflowing from the initial treatment tank 6 is stored in the high water level maintenance tank 8.
The infiltration means 28 is formed by a hollow member such as a steel pipe, and is arranged with its axis directed in the vertical direction.
Of the two end portions of the infiltration means 28, the end portion disposed above passes through the bottom surface of the high water level maintaining tank 8 and is disposed in the high water level maintaining tank 8. An opening 32 that opens upward is formed at the upper end of the portion of the infiltration means 28 disposed in the high water level maintenance tank 8.

Of the both ends of the infiltration means 28, the end disposed below passes through the gravel layer 34 and reaches the impermeable layer 36 such as a clay layer existing below the gravel layer 34. A portion of the infiltration means 28 disposed in the gravel layer 34 is formed with a plurality of infiltration holes 38 formed by through holes penetrating the wall surface of the infiltration means 28.
Therefore, the infiltration means 28 communicates the gravel layer 34 and the high water level maintenance tank 8, and the liquid in the high water level maintenance tank 8 exists below the impermeable layer 36 below the infiltration promoting storage facility 1. It has a function of flowing through the gravel layer 34. In addition, the solid line arrow shown in FIG. 1 shows the path | route at the time of the liquid in the osmosis | permeation means 28 osmose | permeates the gravel layer 34. FIG.

In addition, the gravel layer 34 is a water-permeable formation existing below the impermeable layer 36 below the topsoil layer 2 where the infiltration promoting storage facility 1 is disposed. In FIG. 1, for the sake of explanation, the impermeable layer 36 present above the gravel layer 34 is represented as an impermeable layer 36 a, and the impermeable layer 36 present below the gravel layer 34 is represented as an impermeable layer. It is represented as 36b.
The storage tank 10 has a larger volume than the high water level maintenance tank 8, and the liquid overflowing from the high water level maintenance tank 8, specifically, the upper end of a storage tank side partition wall 40 to be described later from the high water level maintenance tank 8. The liquid which has moved to the storage tank 10 side beyond the position is arranged at a position where it flows into the inside. The bottom surface of the storage tank 10 has the same height as the bottom surface of the high water level maintenance tank 8.

In addition, the storage tank 10 includes a storage tank side partition wall 40 and a storage tank side movement permitting means 42.
The storage tank side partition wall 40 divides the high water level maintenance tank 8 and the storage tank 10, and a storage tank side communication hole 44 that communicates the high water level maintenance tank 8 and the storage tank 10 is formed at the lower end thereof. ing. That is, the storage tank side communication hole 44 is arranged at the same height as the high water level maintenance tank side communication hole 30.
The height of the storage tank side partition wall 40 from the bottom surface of the high water level maintenance tank 8 is lower than the height of the high water level maintenance tank side partition wall 24 from the bottom surface of the high water level maintenance tank 8.

The storage tank side movement permitting means 42 is attached to the vicinity of the upper end of the storage tank side communication hole 44 in the storage tank side partition wall 40 and is disposed at the lower end of the storage tank side partition wall 40. In the present embodiment, as in the case of the initial treatment tank side movement allowance means 18, a case where the storage tank side movement allowance means 42 is formed by a flap valve that opens and closes only in one direction will be described as an example.
Further, when the water level in the storage tank 10 is higher than the water level in the high water level maintenance tank 8, the storage tank side movement permitting means 42 opens the storage tank side communication hole 44, and the high water level maintenance tank 8 The storage tank 10 is connected to allow the liquid to move from the storage tank 10 to the high water level maintenance tank 8.

On the other hand, when the water level in the storage tank 10 is equal to or lower than the water level in the high water level maintenance tank 8, the storage tank side movement permitting means 42 is in a state where the storage tank side communication hole 44 is closed and stored from the high water level maintenance tank 8. The movement of the liquid to the tank 10 is regulated to prevent the liquid from flowing from the storage tank 10 to the high water level maintenance tank 8.
In the state where the liquid outflow from the storage tank 10 to the high water level maintenance tank 8 is prevented, the liquid overflowing from the high water level maintenance tank 8 is stored in the storage tank 10.

FIG. 2 is an enlarged view of the area surrounded by a frame II in FIG.
As shown in FIG. 2, the bottom of the initial treatment tank 6 is formed by filling a large number of crushed stones 46 on the topsoil layer 2 over the entire surface. In particular, an infiltration portion 48 that can penetrate into the topsoil layer 2 is formed. That is, the initial treatment tank 6 has a permeation part 48 that allows the liquid in the initial treatment tank 6 to permeate into the topsoil layer 2 in which the permeation promoting storage facility 1 is disposed. In FIG. 2, a reference numeral 50 denotes a reservoir that is stored in the mud pool 4 and is made of suspended matter in the atmosphere, contaminants, or the like.

Next, operations and effects of the permeation promoting storage facility 1 having the above-described configuration will be described using FIGS. 3 to 5 with reference to FIGS. 1 and 2. In the following description, the penetration promoting storage facility 1 is described as an example in which the infiltration promoting storage facility 1 is disposed in the underground (underground) of the road surface and the liquid is rainwater.
3 is a view showing an installation example of the permeation promoting storage facility 1 of the present embodiment, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line VV in FIG. It is. 3 to FIG. 5 indicates the rainwater movement path, and the solid line arrows illustrated in FIG. 3 and FIG. 4 indicate the rainwater permeation path.
As shown in FIG. 3 to FIG. 5, this infiltration promoting storage facility 1 has an initial treatment tank side partition 16 independent of the mud pool side partition 14, four mud pools 4, and an initial process. Except that only one storage tank 10 is provided for the tank 6 and the high water level maintenance tank 8, the tank 6 and the high water level maintenance tank 8 are configured by the same concept as the permeation promoting storage facility 1 shown in FIGS. 1 and 2. .

Hereinafter, the state of rainwater treated by the permeation promotion storage facility 1 during rainfall will be described.
When a large amount of rainwater falls during heavy rain, such as during heavy rain, the large amount of rainwater passes through the grating 12 and flows down to the mud reservoir 4. In this state, the high water level maintenance tank side communication hole 30 is closed by the high water level maintenance tank side movement permitting means 26. Further, the storage tank side movement permitting means 42 is closed by a storage tank side communication hole 44.
At this time, the height of the mud pool side bulkhead 14 from the bottom surface of the mud pool 4 is that the pollutant contained in the outflow water flowing on the road surface or the like in the early stage of rainfall is stored in the mud pool 4. Since the height is set according to the amount, the stored matter 50 is stored in the mud pool 4 (see FIG. 2).

When the rainwater level in the mud reservoir 4 rises and the rainwater overflows from the mud reservoir 4, the overflowing rainwater passes over the upper end of the mud reservoir septum 14 to the initial treatment tank 6 side. It moves and flows into the initial treatment tank 6.
At this time, the initial treatment tank side movement permitting means 18 is in a state in which the initial treatment tank side communication hole 22 is opened in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, and the initial treatment tank 6 and the sewage pipe 20 are communicated, and the movement of rainwater from the initial treatment tank 6 to the sewage pipe 20 is allowed.

For this reason, in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, rainwater that has flowed into the inside of the initial treatment tank 6 from the mud reservoir 4 is transferred from the initial treatment tank 6 to the sewer pipe 20. It flows out and drains to the sewer network outside the figure.
Moreover, since the bottom part of the initial treatment tank 6 constitutes a permeation part 48 that permeates the liquid in the initial treatment tank 6 into the topsoil layer 2, the groundwater level in the topsoil layer 2 is the same as that of the initial treatment tank 6. In a state where a large amount of rainwater has not permeated into the topsoil layer 2 such as a state not exceeding the bottom surface, it becomes possible to efficiently permeate the rainwater in the initial treatment tank 6 into the topsoil layer 2 (FIG. 2). reference).

When drainage of rainwater from the initial treatment tank 6 to the sewer pipe 20 is continued, the drainage capacity of the sewer pipe network is reduced, and the water pressure in the initial treatment tank 6 does not exceed the water pressure in the sewer pipe 20. Then, the initial treatment tank side movement permitting means 18 is in a state in which the initial treatment tank side communication hole 22 is closed, and the outflow of liquid from the initial treatment tank 6 to the sewer pipe 20 is prevented.
In the state where the liquid outflow from the initial treatment tank 6 to the sewer pipe 20 is prevented, rainwater overflowing from the mud reservoir 4 flows into the initial treatment tank 6 and is stored therein. In this case, when a large amount of rainwater permeates into the topsoil layer 2, such as when the groundwater level in the topsoil layer 2 exceeds the bottom surface of the initial treatment tank 6, the rainwater in the initial treatment tank 6 Infiltration into the topsoil layer 2 is interrupted.

When the inflow of rainwater from the mud reservoir 4 into the initial treatment tank 6 continues and the water level in the initial treatment tank 6 rises and exceeds the height of the bottom surface of the high water level maintenance tank 8, the high water level maintenance tank The water level in 8 becomes below the water level in the initial treatment tank 6.
In this state, when the water level in the initial treatment tank 6 further rises and rainwater overflows from the initial treatment tank 6, the overflowing rainwater passes over the upper end of the initial treatment tank-side partition wall 16 and reaches a high water level. It moves to the maintenance tank 8 side and flows into the high water level maintenance tank 8.

Here, since the high water level maintenance tank side communication hole 30 is blocked by the high water level maintenance tank side movement permitting means 26, the movement of rainwater from the initial treatment tank 6 to the high water level maintenance tank 8 is regulated, As rainwater flows from the initial treatment tank 6 into the high water level maintenance tank 8, the water level in the high water level maintenance tank 8 rises.
Further, when rainwater flows from the initial treatment tank 6 into the high water level maintenance tank 8 and the water level in the high water level maintenance tank 8 rises and exceeds the height of the opening 32 formed in the infiltration means 28, the high water level is reached. Rainwater in the maintenance tank 8 descends through the infiltration means 28 to reach the gravel layer 34 and penetrates into the gravel layer 34 (see FIG. 1).

At this time, since the volume of the high water level maintenance tank 8 is set to the minimum volume at which the permeation means 28 having a scale corresponding to the amount of liquid to be permeated into the gravel layer 34 can be installed, The inflowing rainwater becomes a high water level in the high water level maintenance tank 8 in a short time, and the water level difference between the rain water level in the high water level maintenance tank 8 and the ground water level of the gravel layer 34 is maintained at a high water level.
Here, when the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20 when the drainage capacity of the sewer pipe network is recovered, the initial treatment tank side communication hole 22 is opened and the initial treatment is performed. Rainwater flows out from the tank 6 to the sewer pipe 20, and the water level in the initial treatment tank 6 is lowered.

  When the water level in the initial treatment tank 6 decreases and the water level in the high water level maintenance tank 8 becomes higher than the water level in the initial treatment tank 6, the high water level maintenance tank side communication hole 30 is opened, and the high water level maintenance tank 8. As the rainwater moves from the initial treatment tank 6 to the initial treatment tank 6, the rainwater in the high water level maintenance tank 8 penetrates into the gravel layer 34. And if the water level in the high water level maintenance tank 8 falls and becomes lower than the height of the opening part 32, the permeation into the gravel layer 34 of the rainwater in the high water level maintenance tank 8 will be interrupted.

On the other hand, when the water level in the high water level maintenance tank 8 rises and rainwater overflows from the high water level maintenance tank 8, the overflowing rainwater passes over the upper end of the high water level maintenance tank side partition wall 24 and is stored in the storage tank 10. It moves to the side and flows into the storage tank 10.
Here, since the storage tank side communication hole 44 is closed by the storage tank side movement permitting means 42, the movement of rainwater from the high water level maintenance tank 8 to the storage tank 10 is restricted, and the high water level maintenance tank 8. As rainwater flows into the storage tank 10, the water level in the storage tank 10 rises.

When rainwater flows from the high water level maintenance tank 8 into the storage tank 10 and the groundwater level in the gravel layer 34 is lowered, the rainwater in the high water level maintenance tank 8 penetrates into the gravel layer 34 again. To do.
At this time, if the water level in the high water level maintenance tank 8 decreases as the rainwater in the high water level maintenance tank 8 penetrates into the gravel layer 34, the water level in the storage tank 10 becomes higher than the water level in the high water level maintenance tank 8. Get higher.

  For this reason, the storage tank side movement permitting means 42 is in a state in which the storage tank side communication hole 44 is opened, and rainwater in the storage tank 10 passes through the storage tank side communication hole 44 and moves to the high water level maintenance tank 8. . Then, as rainwater in the high water level maintenance tank 8 penetrates into the gravel layer 34, the water level in the high water level maintenance tank 8 decreases while maintaining the same height as the water level in the storage tank 10. The water level in the water level maintenance tank 8 gradually decreases from the state where the high water level is maintained.

Here, when the drainage capacity of the sewer pipe network is recovered, the rainwater flows out from the initial treatment tank 6 to the sewer pipe 20, and the rainwater moves from the high water level maintenance tank 8 to the initial treatment tank 6. If the water level in 8 falls, the penetration of the rainwater in the high water level maintenance tank 8 into the gravel layer 34 continues and the rainwater in the high water level maintenance tank 8 moves to the initial treatment tank 6.
Therefore, in the infiltration promoting storage facility 1 of the present embodiment, the infiltration means 28 communicates with the gravel layer 34 and the high water level maintenance tank 8, and thus overflows from the initial treatment tank 6 and the high water level maintenance tank. The rainwater that has flowed into the water 8 descends from the high water level maintenance tank 8 to the gravel layer 34 and penetrates by the infiltration means 28.

Further, the permeation promoting storage facility 1 includes a high water level maintenance tank 8 into which liquid overflowing from the initial treatment tank 6 flows and a storage tank 10 into which rainwater overflowing from the high water level maintenance tank 8 flows. The rainwater flowing in from the initial treatment tank 6 can be set to a high water level in the high water level maintenance tank 8 in a short time.
For this reason, it becomes possible to maintain the water level difference between the rainwater level in the high water level maintenance tank 8 and the groundwater level of the gravel layer 34 at a high water level, and the rainwater overflowing from the initial treatment tank 6 can be efficiently removed. It is possible to descend from the high water level maintenance tank 8 and penetrate into the gravel layer 34.

As described above, it is possible to increase the amount of permeation treatment per unit time of the permeation promoting storage facility 1. Moreover, it becomes possible to maintain the time for which the amount of permeation treatment per unit time of the permeation promoting storage facility 1 is increased over a long period of time.
As a result, the infiltration treatment capacity of the infiltration promoting storage facility 1 can be improved and the storage capacity can be recovered early, so that when the soil near the ground surface is saturated during rainfall, Even in the case where the groundwater level of the surface layer rises in this soil, it is possible to improve the permeation ability of rainwater as compared with the conventional one.

In addition, since it is possible to improve the infiltration processing capacity of the infiltration promoting storage facility 1, it becomes possible to reduce the facility required scale and the business scale with respect to the installation plan scale of the infiltration promoting storage facility 1. While it becomes possible to reduce the work concerning installation of the promotion type storage facility 1, it becomes possible to reduce the cost concerning the installation of the penetration promotion type storage facility 1.
Further, in the permeation promoting storage facility 1 of the present embodiment, the permeation means 28 penetrates the impermeable layer 36a below the permeation promoting storage facility 1 and exists in the lower part of the impermeable layer 36a. 34 and the high water level maintenance tank 8 are communicated.

For this reason, the groundwater level of the gravel layer 34 is prevented from rising immediately due to the influence of rainfall, and the water level difference between the rainwater level in the high water level maintenance tank 8 and the groundwater level of the gravel layer 34 is set to a high water level. Can be maintained.
As a result, the permeation processing capacity of the permeation promotion storage facility 1 can be improved, and the storage capacity of the permeation promotion storage facility 1 can be recovered early.
Furthermore, in the permeation promotion type storage facility 1 of the present embodiment, the storage tank 10 into which rainwater overflowing from the high water level maintenance tank 8 flows is such that the water level in the storage tank 10 is higher than the water level in the high water level maintenance tank 8. When it is too high, a storage tank side movement permitting means 42 that permits the movement of rainwater from the storage tank 10 to the high water level maintenance tank 8 is provided.

For this reason, the rainwater in the high water level maintenance tank 8 falls to the gravel layer 34, the water level in the high water level maintenance tank 8 falls, and the water level in the storage tank 10 is higher than the water level in the high water level maintenance tank 8. Then, rainwater in the storage tank 10 passes through the storage tank side communication hole 44 and moves to the high water level maintenance tank 8.
Then, as rainwater in the high water level maintenance tank 8 penetrates into the gravel layer 34, the water level in the high water level maintenance tank 8 decreases while maintaining the same height as the water level in the storage tank 10. While the water level of the rainwater in the water level maintenance tank 8 is maintained at a high water level, the time during which the rainwater is maintained at a high water level in the high water level maintenance tank 8 is prolonged.
For this reason, the rainwater overflowing from the initial treatment tank 6 can be efficiently lowered from the high water level maintenance tank 8 to the gravel layer 34.

As a result, it is possible to improve the infiltration processing capacity of the infiltration promoting storage facility 1 and to enable early recovery of the storage capacity, so that it is in a rainy state where there are multiple peaks in a relatively short time. However, the permeation promoting storage facility 1 can exhibit a sufficient function as a storage facility.
Moreover, since it becomes possible to automatically move the liquid in the storage tank 10 to the high water level maintenance tank 8 according to the state of the water level of the storage tank 10 and the high water level maintenance tank 8, Rain water can be efficiently moved to the high water level maintenance tank 8.

Moreover, if it is the penetration promotion type storage facility 1 of this embodiment, the storage tank side communication hole 44 which connects the high water level maintenance tank 8 and the storage tank 10 in the lower end of the storage tank side partition 40 is formed, The storage tank side movement permitting means 42 is attached to the vicinity of the upper end of the storage tank side communication hole 44 and is disposed at the lower end of the storage tank side partition wall 40.
For this reason, when the water level in the storage tank 10 is higher than the water level in the high water level maintenance tank 8, the rainwater moving from the storage tank 10 to the high water level maintenance tank 8 is efficiently moved to the high water level maintenance tank 8. Thus, the permeation processing capacity of the permeation promoting storage facility 1 can be improved.

Further, in the permeation promoting storage facility 1 according to the present embodiment, the initial treatment tank 6 starts from the initial treatment tank 6 with the water pressure in the initial treatment tank 6 exceeding the water pressure in the sewer pipe 20. An initial processing tank side movement permitting means 18 that allows the liquid to move to 20 is provided.
For this reason, in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, rainwater that has flowed into the initial treatment tank 6 flows out from the initial treatment tank 6 to the sewer pipe 20.

As a result, when the water pressure in the initial treatment tank 6 does not exceed the water pressure in the sewer pipe 20, the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, that is, When the drainage capacity of the sewer pipe network is recovered, the storage capacity of the permeation promotion type storage facility 1 can be recovered early.
Further, in a state where the water pressure in the initial treatment tank 6 does not exceed the water pressure in the sewer pipe 20, the movement of the liquid in the initial treatment tank 6 is regulated from the sewer pipe 20, so that rainwater flowing in the sewer pipe 20 is Even if foreign matter such as mud is mixed, it is possible to prevent the foreign matter from entering the initial treatment tank 6.

In addition, since the liquid in the initial treatment tank 6 can be automatically moved to the sewer pipe 20 according to the water pressure state between the initial treatment tank 6 and the sewage pipe 20, rainwater in the initial treatment tank 6 can be obtained. Can be efficiently discharged to the sewer pipe 20.
Further, in the permeation promoting storage facility 1 of the present embodiment, an initial treatment tank side communication hole 22 that communicates the initial treatment tank 6 and the sewage pipe 20 is formed at the lower end of the initial treatment tank 6. The processing tank side movement permitting means 18 is attached in the vicinity of the upper end of the initial processing tank side communication hole 22 and disposed at the lower end of the initial processing tank side partition wall 16.

For this reason, in the state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewage pipe 20, rainwater flowing out from the initial treatment tank 6 to the sewage pipe 20 can be efficiently discharged to the sewage pipe 20. Thus, the storage capacity of the permeation promoting storage facility 1 can be recovered early.
Further, in the permeation promoting storage facility 1 of the present embodiment, the high water level maintenance tank 8 has a high water level maintenance tank 8 when the water level in the high water level maintenance tank 8 is higher than the water level in the initial treatment tank 6. The high water level maintenance tank side movement permitting means 26 that allows the liquid to move from the initial processing tank 6 to the initial processing tank 6 is provided. Further, a high water level maintenance tank side communication hole 30 for communicating the high water level maintenance tank 8 and the initial treatment tank 6 is formed at the lower end of the high water level maintenance tank side partition wall 24, and the high water level maintenance tank side movement permitting means 26. Is installed near the upper end of the high water level maintaining tank side communication hole 30 and is disposed at the lower end of the high water level maintaining tank side partition wall 24.

For this reason, when the water level in the high water level maintenance tank 8 is higher than the water level in the initial treatment tank 6, the rainwater moving from the high water level maintenance tank 8 to the initial treatment tank 6 is efficiently moved to the initial treatment tank 6. Thus, the storage capacity of the permeation promoting storage facility 1 can be recovered early.
In addition, since the liquid in the high water level maintenance tank 8 can be automatically moved to the initial treatment tank 6 according to the water level of the high water level maintenance tank 8 and the initial treatment tank 6, the high water level is maintained. It becomes possible to move the rainwater in the tank 8 to the initial treatment tank 6 efficiently.

Moreover, if it is the penetration promotion type | mold storage facility 1 of this embodiment, the bottom part of the initial stage processing tank 6 will fill the surface soil layer 2 over the whole surface, and it will form and form the initial stage processing tank 6. 6 is used as a permeation part 48 that permeates rainwater in the topsoil layer 2.
For this reason, it becomes possible to efficiently infiltrate the rainwater in the initial treatment tank 6 into the topsoil layer 2, and in the case of a small scale of rain, the rainwater is allowed to flow into the high water level maintenance tank 8 and the storage tank 10. In addition, rainwater can be treated only by the initial treatment tank 6.

Further, in the permeation promoting storage facility 1 of the present embodiment, the bottom surface of the high water level maintenance tank 8 is higher than the bottom surface of the initial treatment tank 6, and the high water level maintenance tank side communication hole 30 is in the initial state. It is arranged at a position higher than the processing tank side communication hole 22.
For this reason, in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20, rainwater that has flowed into the initial treatment tank 6 flows out from the initial treatment tank 6 to the sewer pipe 20, and the scale of rainfall Is small, the rainwater can be treated only by the initial treatment tank 6 without flowing rainwater into the high water level maintenance tank 8 and the storage tank 10.

As a result, it is possible to simplify the maintenance work of the permeation promotion storage facility 1 and reduce the maintenance cost of the permeation promotion storage facility 1.
Further, in the permeation promotion type storage facility 1 of the present embodiment, the initial treatment tank side movement allowance means 18, the high water level maintenance tank side movement allowance means 26, and the storage tank side movement allowance means 42 are each in only one direction. It is formed by a flap valve that opens and closes.

For this reason, according to each water pressure or water level state of the sewer pipe 20, the initial treatment tank 6, the high water level maintenance tank 8, and the storage tank 10, without requiring an actuator such as a motor or manual operation by a worker or the like. Thus, it is possible to control the moving state of rainwater.
As a result, since it becomes possible to simplify the structure of the penetration promotion type storage facility 1, it becomes possible to simplify the maintenance work of the penetration promotion type storage facility 1, and to maintain the penetration promotion type storage facility 1. Costs can be reduced.

In addition, in this embodiment, although the structure of the penetration promotion type | mold storage facility 1 was set as the structure provided with the mud pool tank 4, the initial stage processing tank 6, the high water level maintenance tank 8, and the storage tank 10, it is limited to this. Instead, the structure of the infiltration promoting storage facility 1 may be configured such that the rainwater flowing down from the ground flows into the initial treatment tank 6 without including the mud reservoir 4. However, as in this embodiment, the configuration of the infiltration promoting storage facility 1 is configured to include the mud reservoir 4 and is particularly included in the outflow water flowing on the road surface and the like in the initial stage of rainfall. The rainwater from which the pollutant is removed can be drained into the sewer network, which is preferable.
In the penetration promoting storage facility 1 of the present embodiment, the case where the penetration means 28 is formed of a hollow member such as a steel pipe has been described, but the invention is not limited thereto. That is, the permeation means 28 may be formed of a solid member in which rainwater can move, such as a tube filled with crushed stone or the like.

  Furthermore, in the penetration promotion type storage facility 1 of the present embodiment, when the water level in the storage tank 10 is higher than the water level in the high water level maintenance tank 8, the rainwater is moved from the storage tank 10 to the high water level maintenance tank 8. Although the storage tank side movement permission means 42 to permit is provided, it is not limited to this, and the storage tank side movement permission means 42 may not be provided. However, as in the infiltration promoting storage facility 1 of the present embodiment, the configuration including the storage tank side movement permitting means 42 efficiently causes rainwater overflowing from the initial treatment tank 6 to be a high water level maintenance tank. It is possible to descend from 8 to the gravel layer 34, which is preferable. Further, the liquid in the storage tank 10 can be automatically moved to the high water level maintenance tank 8 according to the water level state of the storage tank 10 and the high water level maintenance tank 8. As a result, the rainwater in the storage tank 10 can be efficiently moved to the high water level maintenance tank 8, which is preferable.

  Further, in the permeation promoting storage facility 1 of the present embodiment, when the water level in the high water level maintenance tank 8 is higher than the water level in the initial treatment tank 6, the liquid from the high water level maintenance tank 8 to the initial treatment tank 6 is stored. Although the high water level maintenance tank side movement permission means 26 that allows movement is provided, the present invention is not limited to this, and the high water level maintenance tank side movement permission means 26 may not be provided. However, as in the infiltration promoting storage facility 1 of the present embodiment, the configuration including the high water level maintenance tank side movement permitting means 26 is in the state of the water level between the high water level maintenance tank 8 and the initial treatment tank 6. Accordingly, the liquid in the high water level maintenance tank 8 can be automatically moved to the initial treatment tank 6. As a result, the rainwater in the high water level maintenance tank 8 can be efficiently moved to the initial treatment tank 6, which is preferable.

  Further, in the permeation promoting storage facility 1 of the present embodiment, the liquid is allowed to move from the initial treatment tank 6 to the sewer pipe 20 in a state where the water pressure in the initial treatment tank 6 exceeds the water pressure in the sewer pipe 20. However, the present invention is not limited to this, and the initial processing tank side movement permitting means 18 may be omitted. However, according to the state of the water pressure between the initial treatment tank 6 and the sewer pipe 20, the configuration including the initial treatment tank-side movement permitting means 18, as in the permeation promoting storage facility 1 of the present embodiment, It becomes possible to automatically move the liquid in the initial treatment tank 6 to the sewer pipe 20. As a result, the rainwater in the initial treatment tank 6 can be efficiently discharged to the sewer pipe 20, which is preferable.

  Further, in the infiltration promoting storage facility 1 of the present embodiment, the bottom of the initial treatment tank 6 is the infiltration part 48 that infiltrates the rainwater in the initial treatment tank 6 into the topsoil layer 2, but is not limited thereto. For example, the bottom of the initial treatment tank 6 may be made of a surface having no voids or holes with concrete or the like so that rainwater in the initial treatment tank 6 does not penetrate into the topsoil layer 2. However, as in the infiltration promoting storage facility 1 of this embodiment, the bottom of the initial treatment tank 6 is used as the infiltration part 48 that permeates rainwater in the initial treatment tank 6 into the topsoil layer 2. It is preferable because rainwater in the tank 6 can be efficiently infiltrated into the topsoil layer 2.

  Further, in the infiltration promoting storage facility 1 of the present embodiment, the bottom of only the initial treatment tank 6 is the infiltration part 48 that infiltrates the rainwater in the initial treatment tank 6 into the topsoil layer 2, but is not limited thereto. It is not something. That is, for example, not only the bottom of the initial treatment tank 6 but also the bottoms of the high water level maintenance tank 8 and the storage tank 10 may be infiltrated parts 48 that allow rainwater in each tank to permeate into the topsoil layer 2. In short, at least one of the initial treatment tank 6, the high water level maintenance tank 8, and the storage tank 10 has a permeation section 48 that can permeate rainwater in the tank into the topsoil layer 2 at the bottom. Any configuration may be used.

  Moreover, in the penetration promotion type storage facility 1 of the present embodiment, the bottom of the initial treatment tank 6 is the penetration part 48 over the entire surface, but is not limited to this. A part of the bottom of the initial treatment tank 6 such as the vicinity of the center of the bottom may be used as the permeation unit 48. However, like the infiltration promoting storage facility 1 of the present embodiment, the bottom portion of the initial treatment tank 6 is used as the infiltration part 48 over the entire surface, so that the rainwater in the initial treatment tank 6 can be efficiently used as a topsoil layer. 2 is preferable because it can be penetrated into 2.

  Moreover, in the permeation promotion type storage facility 1 of the present embodiment, the initial treatment tank side movement allowance means 18, the high water level maintenance tank side movement allowance means 26, and the storage tank side movement allowance means 42 are each formed by a flap valve. However, the present invention is not limited to this. That is, the initial treatment tank side movement allowance means 18, the high water level maintenance tank side movement allowance means 26, and the storage tank side movement allowance means 42 may be formed by, for example, valves configured to be operated by an actuator such as a motor. However, as in the permeation promoting storage facility 1 of this embodiment, the initial treatment tank side movement allowance means 18, the high water level maintenance tank side movement allowance means 26, and the storage tank side movement allowance means 42 do not require an actuator. Forming with a flap valve that can be actuated is preferable because the configuration of the permeation promoting storage facility 1 can be simplified. The initial treatment tank side movement allowance means 18, the high water level maintenance tank side movement allowance means 26, and the storage tank side movement allowance means 42 may each be formed by a check valve.

  Further, in the permeation promoting storage facility 1 of the present embodiment, the initial processing tank side communication hole 22 is formed at the lower end of the initial processing tank side partition wall 16, and the initial processing tank side movement permitting means 18 is used as the initial processing tank. Although it was set as the structure installed near the upper end of the side communication hole 22 and arrange | positioned at the lower end of the initial stage treatment tank side partition 16, it is not limited to this. That is, for example, the initial processing tank side communication hole 22 is formed in the vicinity of the center of the initial processing tank side partition wall 16, and the initial processing tank side movement permitting means 18 is attached near the upper end of the initial processing tank side communication hole 22, It is good also as a structure arrange | positioned near the center of the initial stage tank side partition 16. However, as in the permeation promoting storage facility 1 of the present embodiment, the initial treatment tank side communication hole 22 is formed at the lower end of the initial treatment tank side partition wall 16, and the initial treatment tank side movement permitting means 18 is the initial treatment tank side partition wall. The configuration disposed at the lower end of 16 is preferable because rainwater flowing out from the initial treatment tank 6 to the sewer pipe 20 can be efficiently drained to the sewer pipe 20.

  Furthermore, in the permeation promotion type storage facility 1 of the present embodiment, the high water level maintenance tank side communication hole 30 is formed at the lower end of the high water level maintenance tank side partition wall 24, Although it was set as the structure installed near the upper end of the high water level maintenance tank side communicating hole 30 and arrange | positioned at the lower end of the high water level maintenance tank side partition wall 24, it is not limited to this. That is, for example, the high water level maintenance tank side communication hole 30 is formed near the center of the high water level maintenance tank side partition wall 24, and the high water level maintenance tank side movement permitting means 26 is located near the upper end of the high water level maintenance tank side communication hole 30. It is good also as a structure attached and arrange | positioned in the center vicinity of the high water level maintenance tank side partition wall 24. FIG. However, like the infiltration promoting storage facility 1 of the present embodiment, the high water level maintenance tank side communication hole 30 is formed at the lower end of the high water level maintenance tank side partition wall 24, and the high water level maintenance tank side movement permitting means 26 is the high water level. Since it is possible to efficiently move rainwater moving from the high water level maintenance tank 8 to the initial treatment tank 6 to the initial treatment tank 6 by adopting a configuration arranged at the lower end of the maintenance tank-side partition wall 24. Is preferable.

  Further, in the permeation promoting storage facility 1 of the present embodiment, a storage tank side communication hole 44 is formed at the lower end of the storage tank side partition wall 40, and the storage tank side movement permitting means 42 is connected to the storage tank side communication hole 44. However, the present invention is not limited to this. That is, for example, the storage tank side communication hole 44 is formed in the vicinity of the center of the storage tank side partition wall 40, and the storage tank side movement permitting means 42 is attached near the upper end of the storage tank side communication hole 44. It is good also as a structure arrange | positioned in the center vicinity of 40. However, as in the permeation promoting storage facility 1 of this embodiment, the storage tank side communication hole 44 is formed at the lower end of the storage tank side partition wall 40, and the storage tank side movement permitting means 42 is formed at the lower end of the storage tank side partition wall 40. It is preferable that the arrangement is arranged because rainwater moving from the storage tank 10 to the high water level maintenance tank 8 can be efficiently moved to the high water level maintenance tank 8.

  Further, in the infiltration promoting storage facility 1 of the present embodiment, the infiltration means 28 communicates the gravel layer 34 and the high water level maintenance tank 8, but is not limited thereto, and the infiltration means 28 is For example, a formation other than the gravel layer, such as a sand layer or gravel layer, and the high water level maintenance tank 8 may be communicated. In short, the infiltration means 28 includes a water permeable formation formed below the impermeable layer 36a existing below the topsoil layer 2 where the infiltration promoting storage facility 1 is disposed, and the high water level maintenance tank 8. Need only be communicated.

In addition, the infiltration promoting storage facility 1 of the present embodiment is applied in the case where the liquid flowing down from the ground is rainwater while being arranged in the basement of the road surface, but is not limited to this, for example, It may be applied to a case where the liquid that is arranged underground in a factory or the like and flows down from the ground is industrial water such as cooling water.
Further, in the permeation promoting storage facility 1 of the present embodiment, the end portion disposed above among the both end portions of the permeation means 28 penetrates the bottom surface of the high water level maintenance tank 8 and enters the high water level maintenance tank 8. However, the present invention is not limited to this, although the opening 32 that opens upward is formed at the upper end thereof. That is, for example, the upper end of the upper end of the infiltration means 28 is at the same height as the bottom surface of the high water level maintenance tank 8, and an opening is formed on the bottom surface of the high water level maintenance tank 8. It is good also as a structure by which 32 is arrange | positioned.

Moreover, in the penetration promotion type storage facility 1 according to the present embodiment, the opening formed by the grating 12 is disposed only above the mud reservoir 4, but the present invention is not limited to this. That is, for example, an openable / closable member such as a manhole may be installed above the high water level maintenance tank 8.
In this case, at the time of a disaster, for example, by pumping up groundwater through the infiltration means 28, the infiltration promotion storage facility 1 can be made to function as a well for disaster management. The stored rainwater can be used for daily life water, manhole toilet water, and the like.

For this reason, it becomes possible to utilize the permeation promotion type storage facility 1 as a supply base for emergency water.
In addition, during daily fine weather, the infiltration promotion type storage facility 1 can function as a pumping well for pumping up groundwater, and the pumped-up groundwater can be used as environmental water. In addition, by pumping up groundwater through the infiltration means 28, the infiltration means 28 can be cleaned and a high infiltration capacity can be maintained over a long period of time.
Moreover, in the penetration promotion type storage facility 1 of this embodiment, although the bottom face of the high water level maintenance tank 8 is higher than the bottom face of the initial treatment tank 6, it is not limited to this, and the high water level maintenance tank The bottom surface of 8 may be the same height as the bottom surface of the initial treatment tank 6.

Moreover, in the permeation promotion type storage facility 1 of the present embodiment, the storage tank 10 is formed so as to have a larger volume than the high water level maintenance tank 8, but the present invention is not limited to this. However, it may be formed so that it may become the same volume as the high water level maintenance tank 8, and the storage tank 10 may be formed so that a volume may become smaller than the high water level maintenance tank 8. FIG.
Moreover, in the penetration promotion type storage facility 1 of this embodiment, although the bottom face of the storage tank 10 is the same height as the bottom face of the high water level maintenance tank 8, it is not limited to this, The bottom surface may be higher than the bottom surface of the high water level maintenance tank 8.

(Example)
The storage facility of the example of the present invention and the storage facility of the comparative example were installed on the depression topography that is frequently flooded, and the design analysis on the difference in the flooding situation was performed.
As the storage facility of the example of the present invention, a penetration promoting storage facility having the same configuration as that described in the embodiment of the present invention as shown in FIGS. 1 and 2 was used. The permeation promoting storage facility has a storage capacity of 200 m ³ , and further has a permeation promoting function including permeation means, unlike the storage facility of the comparative example.
As a storage facility of the comparative example, a storage facility having a structure that does not have a penetration promotion function was used. The storage facility of the comparative example has a storage capacity of 200 m ³ .

FIG. 6 is a diagram illustrating a design target rainfall set when performing design analysis. In addition, the vertical axis | shaft of FIG. 6 has shown the rainfall (mm / 5 minutes), and the horizontal axis of FIG. 6 has shown elapsed time.
As shown in FIG. 6, this design target rainfall is one in which multiple large-scale rainfalls occur in a short time, and in particular, two peaks occur.
In this design analysis, the storage function at the second rain was analyzed in a state where the storage facility was full at the first rain.

FIG. 7 is a diagram showing the analysis result of the inundation situation before the implementation of the countermeasure, FIG. 8 is a diagram showing the analysis result of the inundation situation when the storage facility of the comparative example is installed, and FIG. It is a figure which shows the analysis result of the inundation situation at the time of installing the storage facility of an example. FIGS. 7 to 9 are all diagrams showing the situation when the second raindrop has occurred.
As shown in FIG. 8, when the storage facility of the comparative example is installed, if the storage facility is full in the first rain, the storage function is not sufficiently exhibited in the second rain.
On the other hand, as shown in FIG. 9, when the storage facility of the present invention example is installed, it is possible to infiltrate the rainwater stored between rainfalls, so that the storage capacity is restored. In addition, it was confirmed that the storage function was demonstrated even for the second rainy eye.

  From the above analysis results, by installing the storage facility of the present invention example, in comparison with the case of installing the storage facility of the comparative example or the situation before the implementation of the countermeasure as shown in FIG. It was confirmed that inundation damage at the frequent occurrence site was minor. In addition, this makes it possible to make the storage facility a small countermeasure facility, thereby obtaining a cost reduction effect.

It is a figure which shows the concept of the penetration promotion type storage facility of this invention. FIG. 2 is an enlarged view of a range surrounded by a frame II in FIG. 1 and its surroundings. It is a figure which shows the example of installation of a penetration promotion type | mold storage facility. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a figure which shows the condition of the rain for design object set when performing a design analysis. It is a figure which shows the analysis result of the inundation condition before implementation of countermeasures. It is a figure which shows the analysis result of the inundation situation at the time of installing the storage facility of a comparative example. It is a figure which shows the analysis result of the inundation situation at the time of installing the storage facility of the example of this invention. It is a figure which shows one form of the inundation phenomenon in a city.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permeation promotion type storage facility 2 Topsoil layer 4 Mud basin 6 Initial treatment tank 8 High water level maintenance tank 10 Storage tank 12 Grating 14 Mud basin side bulkhead 16 Initial treatment tank side bulkhead 18 Initial treatment tank side movement allowance means 20 Sewer pipe 22 Initial treatment tank side communication hole 24 High water level maintenance tank side partition 26 High water level maintenance tank side movement allowing means 28 Permeation means 30 High water level maintenance tank side communication hole 32 Opening 34 Gravel layer 36 Impervious layer 38 Infiltration hole 40 Storage tank Side bulkhead 42 Storage tank side movement permitting means 44 Storage tank side communication hole 46 Crushed stone 48 Penetration part 50 Storage

Claims (5)

An infiltration-promoting storage facility that is placed in the ground and stores liquid that has flowed down from the ground, infiltrates into the ground, and flows out to the sewer pipe,
An initial treatment tank capable of storing liquid flowing down from the ground and communicating with the sewer pipe, a high water level maintenance tank into which liquid overflowing from the initial treatment tank flows, and a liquid overflowing from the high water level maintenance tank And a permeation means for allowing the liquid in the high water level maintenance tank to flow through the water permeable layer located below the impermeable layer below the permeation promotion type storage facility. Type storage facility.   The infiltration promoting storage facility according to claim 1, wherein the infiltration means is a hollow member that communicates the high water level maintenance tank and the water permeable layer. A storage tank-side movement permitting means for allowing movement of liquid from the storage tank to the high water level maintenance tank and regulating movement of liquid from the high water level maintenance tank to the storage tank;
The storage tank side movement permitting means allows liquid to move from the storage tank to the high water level maintenance tank when the water level in the storage tank is higher than the water level in the high water level maintenance tank. The penetration promoting storage facility according to claim 1 or 2. A high water level maintenance tank side movement permitting means for allowing movement of the liquid from the high water level maintenance tank to the initial treatment tank and regulating movement of the liquid from the initial treatment tank to the high water level maintenance tank,
The movement permitting means on the high water level maintenance tank side allows movement of liquid from the high water level maintenance tank to the initial treatment tank when the water level in the high water level maintenance tank is higher than the water level in the initial treatment tank. The permeation-enhanced storage facility according to any one of claims 1 to 3, wherein:   At least one of the initial treatment tank, the high water level maintenance tank, and the storage tank permeates the liquid in the tank into the water permeable layer in which the permeation promoting storage facility is disposed at least at a part of the bottom. The permeation promoting storage facility according to any one of claims 1 to 4, further comprising a permeation portion that can be used.

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