JP2023114326A - Connected underground water tank - Google Patents

Abstract

To provide an underground water tank that mitigates heavy rain disasters and enables effective use of water in the water tank.SOLUTION: A connected underground water tank 1 has an independent underground water tank 2 filled with a horizontal pipe 2c, a vertical pipe 2d, and a porous member 2g inside, and is connected by a connecting pipe 3 and a water conduit 4. The independent underground water tank 2 also has a function of permeating the water that has flowed from a water source 5 via the horizontal pipe 2c and the vertical pipe 2d into the porous member 2g to store or discharge the water. Water is purified by the porous member 2g. The plurality of independent underground water tanks 2 are connected in a region by the connecting pipes 3 to form a connected underground water tank 1 that integrates the region and mitigates flooding.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a connected underground water tank in which a plurality of single underground water tanks, which are installed underground and filled with a porous member having flood mitigation and water storage functions, are connected.
Specifically, by connecting a plurality of individual underground water tanks filled with porous members having continuous pores, rainwater, domestic wastewater, and water introduced from rivers are stored in a plurality of water tanks filled with porous members having continuous pores. The present invention relates to a connected underground water tank in which a plurality of single underground water tanks are connected so that water can be stored in the underground water tank and used according to the application.

Due to global warming, droughts and torrential rain disasters are occurring frequently worldwide. Flood countermeasures are strongly required.

Typhoons and torrential rains that concentrate in a small area cause disasters when a large amount of rain concentrates temporarily. There is a need for techniques to mitigate flooding by distributing floodwaters over many areas.

On the other hand, there are areas suffering from drought, and water sources are needed to supply water to these drought areas.

Therefore, for example, in Patent Document 1, lawn is used as the first filter tank, sand and stones are spread to make it the second filter tank, and an underground sprinkler pipe is piped in the second filter tank, so that the water from the combined septic tank There is a wastewater filtration system that filters wastewater.

Japanese Patent Application Laid-Open No. 2008-080305

However, although the drainage filtration system described in Patent Literature 1 is a filtration device that purifies water by circulating it in the vertical direction, it does not take measures against flooding.
Localized torrential rains in recent years have a strong tendency to become locally intense torrential rains, and localized inland water flooding often occurs, but the above technology does not take measures against it.

The present invention has been devised in view of the above points. The challenge is to prevent inland flooding.

In order to achieve the above objects, there is provided a connected underground water tank buried in the ground, the connected underground water tank comprising a plurality of single underground water tanks connected by a connecting pipe, The single underground water tank has an underground water tank floor surface having a predetermined area in contact with the underground ground, and an underground water tank side surface having a predetermined height in contact with the stratum surface of the peripheral part so as to surround the underground water tank floor surface. and the floor surface of the underground water tank and the side surface of the underground water tank are formed of an impermeable member, and inside the single underground water tank, contact with the floor surface of the underground water tank so as to cover the entire floor surface A horizontal pipe having a predetermined length and a predetermined thickness is installed, and a vertical pipe is connected above the horizontal pipe at a predetermined interval, and the vertical pipe has a predetermined length and a predetermined thickness. It has a thickness and is made of a material with a predetermined pore or is formed by processing a predetermined pore in plastic. A vent hole and a water level gauge are provided to lead from the inside of the single underground water tank to the outside above, and a porous member having continuous pores is filled in the void part in the single underground water tank. The upper surface of the porous member is filled with a water-impermeable member to form a layered structure, and both ends of the horizontal pipe extend outside the single underground water tank and are connected to the connecting pipe, The connecting pipe is connected to another single underground water tank, and at least part of the connecting pipe is connected to a facility whose water source is rain or snow, river water, or domestic wastewater. a connected underground reservoir integrated with a plurality of single underground reservoirs in or connected to the drain.

In addition, the present invention addresses the problem of reducing inland water flooding caused by typhoons and localized torrential rain by filling the entire underground water tank with a porous member having continuous pores such as Shirasu pumice. We aimed for an underground water storage tank that does not limit the use of the above-ground part of the water.
In the present invention, the surface of the soil on the ground is indicated as the ground surface, the inside of the soil below the surface is indicated as the underground, and the part that is one step lower than the surrounding ground surface is indicated as the underground. The surface that spreads out into the ground is indicated as the underground ground, and the surface that is underground and spreads in a substantially vertical direction is indicated as the stratum surface. Shirasu pumice is defined as a mixture of Shirasu with the properties of

In addition, the horizontal pipes and vertical pipes inside the single underground water storage tank of the present invention are important elements for quickly spreading the water that has flowed in from the outside throughout the single underground water storage tank or for draining it all at once. Although a certain amount of time is required for the water to permeate the porous member filled inside the water tank or to drain the water, horizontal pipes and vertical pipes are integrated and arranged throughout the underground water tank. , provides the function of significantly shortening the time required for water absorption or drainage.

The connected underground water tank according to the present invention becomes a large-scale underground water tank by connecting single underground water tanks. To provide a function capable of effectively using stored water.

The Shirasu pumice filled in the single underground reservoir has an environment favored by many soil microorganisms, and the water that flows into this single underground reservoir passes through the Shirasu pumice, and the soil settled in the Shirasu pumice. It provides the function of being purified by microorganisms, filtered, and reborn as clean water.

Torrential rainfall in recent years has a strong tendency to concentrate in a specific narrow area, and if a wide-area connected underground reservoir connected by a connecting pipe appears, the localized torrential rain will be diffused and leveled throughout the wide area. Localized inland flooding is prevented by being trapped underground.

Also, when heavy rains such as typhoons are expected, emptying the water stored in the connected underground water tank in advance restores the ability to store a large amount of water, creating a time lag for rivers that are concentrated at one time. , it can contribute to flood mitigation by extending the time required for drainage.

Wide-area connected underground water tanks are used as a daily water source by merging river water, rainwater in normal times, or discharged water from purification plants through connecting pipes and water pipes to ensure a constant amount of water at all times. can also be used and exported to drought-prone areas at the same time.

FIG. 1 is a plan view simply showing an overall image of a connected underground water tank that constitutes the basis of the present invention, in which independent underground water tanks are connected by connecting pipes to form a large-scale integrated connected underground water tank, and various water sources. It is possible to absorb water from the water by connecting pipes, and by connecting a part of the connecting pipes to the water conduit, it is possible to effectively use the stored water.

It is a three-dimensional view showing a cross section of a part of a single underground water tank forming a part of the connected underground water tank, in which a pillar or a partition is provided, a horizontal pipe and a vertical pipe are piped, and a vent leading to the upper outside. A water level gauge is provided, the gap is filled with Shirasu pumice, and a partition wall is provided with a clay layer, which is an impermeable member.

In addition, FIG. 2 shows a state in which the horizontal pipe is connected to the connecting pipe outside the single underground water tank, and the connecting pipe is provided with a water stop valve.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates, referring drawings for embodiment of the connection underground water-storage tank 1 which becomes the basis of this invention, and uses it for understanding of this invention.

The connected underground water tank 1 that is the basis of the present invention shows the overall outline of various facilities installed underground in the plan view of FIG. 1, and FIG. is a cross-sectional view showing a part of.

FIG. 1 shows a connected underground water tank 1 showing the basis of the present invention, which includes a plurality of single underground water tanks 2 constituting the connected underground water tank 1, a connecting pipe 3 connecting them, and a water flow in the connecting pipe. A water stop valve 3a, a water source 5 flowing into an independent underground water tank 2 through a connecting pipe 3, and a water conduit 4 connected to a river or other connected underground water tank 1 are shown schematically.

FIG. 2 is a cross-sectional view showing the internal structure of the single underground water storage tank 2. A hole is dug in the ground 8 to form a basement, and concrete or clay, which is an impermeable member 6, is formed on the underground ground. By forming the water tank floor surface 2a and forming the single underground water tank side surface 2b with concrete or clay as the impermeable member 6 around the single underground water tank floor surface 2a, a box-shaped structure with an open top is formed. A single underground water tank is formed, and a single underground water tank horizontal pipe 2c is installed on the floor surface of the single underground water tank.

In order to simplify the description of this embodiment, the floor surface 2a of the single underground water tank will be referred to as the floor surface 2a, the side surface 2b of the single underground water tank will be referred to as the side surface 2b, and the horizontal pipe 2c in the single underground water tank will be referred to as the horizontal pipe. 2c, and the vertical pipe 2d in the single underground water tank is displayed with the vertical pipe 2d, etc., omitting the name of the single underground water tank.

The horizontal pipe 2c is a cylindrical shape molded from plastics, and stretches over the entire upper part of the floor surface 2a. A forest of 2d is made, and both ends of the horizontal pipe 2c are put out to the outside of the single underground water tank and connected to the connecting pipe 3.
It should be noted that the plastics described in this application refer to new plastics plus recycled waste plastics.

The vertical pipe 2d connected to the horizontal pipe 2c has a diameter of 5 cm to 9 cm depending on the situation of the single underground water tank, and the length is within the height of the side surface 2b, and is a fine pipe of 1 mm or less. A forest of vertical pipes 2d integrated into the entire single underground water tank is formed by forming a large number of holes in plastics, sealing the upper surface, and connecting the lower part to the horizontal pipe 2c, and the gap is porous. Spread 2g of ingredients.

The porous member 2g laid in the voids in the single underground water tank 2 of the present invention is a mixture of pumice stone having continuous pores and shirasu pumice, and in this embodiment, 2g of this shirasu pumice stone is filled.

After laying a certain amount of Shirasu pumice stone 2g in the gap in the single underground water storage tank 2, an impermeable member is placed on the certain amount of Shirasu pumice stone 2g in order to prevent the Shirasu pumice stone 2g from flowing due to the inflowing water. 6 (indicated as a clay layer 6 in this embodiment) is spread and fixed, and this process is repeated up to the upper surface of the independent underground water storage tank 2 to stack and fill up to the upper surface.

In order to prevent excessive water from flowing into the single underground water tank 2, or to prevent excessive outflow, or to intentionally release water, the connecting pipe 3 is provided with a water stop valve 3a, which can be used freely. make it possible to adjust.

The air in the shirasu pumice stone 2g and in the voids is confined by the clay layers 6 laminated in multiple layers, and this hinders the intake and exhaust of air accompanying the inflow and discharge of water, thereby hindering the inflow and discharge of water. In order to prevent this from occurring, or to prevent the air in the Shirasu pumice stone 2g from becoming anaerobic due to lack of air, a vent 2e leading to the outside air on the ground is provided.

The ground surface 7 above the single underground water tank 2 is expected to deteriorate with the passage of time. There are no restrictions on use.

Depending on the purpose of use of the upper surface of the single underground water tank 2, a pillar or partition wall 2j can be installed inside the single underground water tank 2 to make the upper surface of the single underground water tank more robust and stable.

The water sources 5 flowing into the independent underground water storage tank 2 include abnormal rainwater 5 due to typhoons and torrential rains, temporary water sources 5 such as rainwater that falls on a daily basis, water 5 discharged from domestic wastewater purification facilities, and water 5 from rivers. There is a constant water source 5 from which water is taken.

The water source 5 flowing into the independent underground water storage tank 2 includes subsoil water 5a that flows underground in rivers and volcanic areas, unlike water sources that exist on the ground. In order to take in water, it is possible to take in water by forming part of the side surface 2b of the single underground water storage tank with a water-permeable member.

Rainwater, which is the water source 5 of the connected underground water tank 1, is often a temporary water source 5, and in order to use the water of the connected underground water tank 1 stably, it is introduced to introduce constantly available river water. Water pipe 4 also plays an important role.

The connected underground water tank 1 is formed by connecting a plurality of single underground water tanks 2 by means of connecting pipes 3. It is this connecting pipe 3 that is important in forming the huge connected underground water tank 1 that controls the entire area. functions.

The Shirasu pumice that fills the voids of the single underground reservoir is a product of submarine volcanoes. It can hold a lot of water in its pores and at the same time can drain it quickly, making it an ideal material for a single underground water tank. ing.

Pumice stone, which is a product of submarine volcanoes, has rounded corners and is fluid when it is rubbed and rubbed by waves, and is unstable for stacking. , the fluidity is reduced by increasing the contact surface, and stable lamination can be achieved.

Single underground water tanks and connected underground water tanks are all built underground, and there are no restrictions on the use of the ground surface above them. The upper ground surface can be used freely.

Large-scale connected underground water tanks temporarily store heavy rainfall caused by typhoons and torrential rains, thereby mitigating inland flooding caused by time lags, and by extension, flooding. can bring benefits.

1 Connected underground water tank 2 Single underground water tank 2a Single underground water tank floor surface 2b Single underground water tank side surface 2c Horizontal pipe in single underground water tank 2d Vertical pipe 2e in single underground water tank Vent 2f of single underground water tank Water level gauge of single underground water tank 2g Porous member or Shirasu pumice stone 2h in single underground water storage tank Porous member containing water or Shirasu pumice stone 2j in single underground water storage tank Pillar or partition wall in single underground water storage tank 3 Connecting pipe 3a Water stop valve 4 Conveyance pipe 5 Water source (water source on the ground)
5a Water source (subsoil water flowing underground)
6 Impermeable member (or clay)
7 Surface 8 Underground 9 Embankment

Claims (5)

A connected underground water tank buried in the ground,
The connected underground water tank is configured by connecting a plurality of independent underground water tanks with a connecting pipe,
The single underground water tank has an underground water tank floor having a predetermined area in contact with the underground ground, and an underground water tank having a predetermined height in contact with the stratum surface of the periphery so as to surround the underground water tank floor. There is a side surface, the underground water tank floor surface and the underground water tank side surface are formed of an impermeable member,
A horizontal pipe having a predetermined length and a predetermined thickness is installed inside the single underground water tank so as to contact the floor surface of the underground water tank and cover the entire floor surface,
A vertical pipe is connected above the horizontal pipe at a predetermined interval,
The vertical pipe has a predetermined length and thickness, is made of a material with a predetermined pore, or is formed by processing plastic with a predetermined pore, and has a sealed upper surface and a lower surface. is installed vertically connected to the horizontal pipe,
A vent and a water level gauge are provided that lead from the inside of the single underground water tank to the upper outside,
A porous member having continuous pores is filled in a void in the single underground water tank,
An impermeable member is filled on the upper surface of the porous member to form a layer,
Both ends of the horizontal pipe are connected to the connecting pipe outside the single underground water tank,
The connecting pipe is connected to another single underground water tank,
At least a part of the connecting pipe is connected to a facility whose water source is rainfall, snowfall, river water, or domestic wastewater, or is connected to a drain outlet, and a plurality of single underground water reservoirs. Connected underground water tank with integrated tank. 2. The connected underground water tank according to claim 1, wherein the single underground water tank is provided with pillars or partition walls. 3. A connected underground water tank according to claim 1 or 2, wherein at least part of the side surface of said underground water tank is formed of a water-permeable member. Claim 1, Claim 2, or Claim 3, wherein at least part of the connecting pipe is connected to a water stop valve or to a water conduit. connected underground reservoir. Claim 1, Claim 2, Claim 3, or Claim 1, Claim 2, Claim 3, or Claim 1, Claim 2, or Claim 3, wherein at least part of the connected underground water tank is connected by the connecting pipe to a water tank not filled with a porous member. 5. A connected underground water reservoir according to any one of claims 4.

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