JP7162224B2 - water storage structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water storage structure for permeating into the ground and storing rainwater that has fallen on grounds, parking lots, squares, or the like.

In order to effectively utilize rainwater, there have been proposed structures with various structures and functions for water storage structures in which rainwater that has fallen on the ground permeates into the ground and is stored in water tanks buried underground. The present invention relates to, for example, an "underground filtration and water supply system for rainwater" described in Patent Document 1, and an "underground storage tank for agricultural land" described in Patent Document 2, and the like.

The "rainwater underground filtration and water supply apparatus" described in Patent Document 1 uses a lawn spread on the ground as a first filtration layer, and forms a second filtration layer in which sand and stones are spread under the lawn, A waterproof sheet is laid on the bottom of this filtration layer, a part of this waterproof sheet is opened, and a filtered water storage tank having an inlet formed at the top is provided below this opening, and separately from this, a collection tank is provided. A raw water reservoir for storing rainwater is provided, and a sprinkler pipe for sprinkling water from the raw water reservoir and the filtered water reservoir to the filtration layer via a sprinkler pump is buried in the filtration layer, and the filtered water is stored. A tank is provided with a water supply pump for supplying water to equipment that uses filtered water.

The "underground storage tank for agricultural land" described in Patent Document 2 is a water storage space formed by arranging resin box members having openings for communicating inside and outside in the vertical, horizontal, and height directions. An underground storage tank for agricultural land, comprising a box array structure that forms and bears a load from the surroundings, and a waterproof protection layer that covers at least the bottom surface and side surfaces of the box array structure, in which the box member is removed. By not arranging the box array structure in the vertical direction, an inspection space is formed that penetrates the inside of the box array structure in the height direction, this inspection space is extended to the ground, and the part of the inspection space between the box array structure and the ground is The inspection space is surrounded by a box member, and an opening/closing lid is provided at the opening of the inspection space to the ground.

JP-A-2005-16269 JP 2009-150179 A

The "rainwater underground filtration water supply apparatus" described in Patent Document 1 has the advantage of circulating and filtering rainwater, so that clean water can be reused and it can be used as an emergency water supply tank. However, since a hollow water tank must be constructed in the ground, a large amount of construction materials and a great deal of labor are required to form a strong support structure to support it. In addition, if a major earthquake occurs and the surrounding ground changes (faults, fissures, etc.), the storage tank and waterproof sheet may be damaged and the stored water may leak. There is

In the "underground storage tank for agricultural land" described in Patent Document 2, a structure that combines a plurality of blocks is arranged in the water tank, so the structure of the water tank itself is simplified, but many A block is required, and the assembly work of the block is also complicated. In addition, if a large earthquake occurs and the surrounding ground changes (faults, cracks, etc.), the water tank may be damaged and the stored water may leak.

Therefore, the problem to be solved by the present invention is to provide a water storage structure that can be easily constructed with a relatively small amount of materials and that is excellent in earthquake resistance and durability.

A first water storage structure according to the present invention includes:
a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the tubular body;
a roadbed layer provided on the ground with the underdrain pipe buried;
a permeable layer provided on the roadbed layer;
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing a mixture on the roadbed layer. It is characterized by being solidified.

Next, the second water storage structure according to the present invention is
a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the cylindrical body;
a permeable layer provided on the ground with the underdrain pipe buried;
a pavement layer provided on the permeable layer,
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing the mixture on the ground. It is characterized by being solidified.

Next, the third water storage structure according to the present invention is
a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the cylindrical body;
a permeable layer provided on the ground with the underdrain pipe buried;
An artificial turf or natural turf planted on the permeable layer,
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing the mixture on the ground. It is characterized by being solidified.

Next, the fourth water storage structure according to the present invention is
a water tank buried in the ground;
a water-permeable cylindrical body erected upward from the water tank with its lower portion communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
a roadbed layer provided on the ground;
a permeable layer provided on the roadbed layer;
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing a mixture on the roadbed layer. It is characterized by being solidified.

In the water storage structure, an overflow pipe may be provided for discharging water out of the water tank when the amount of water stored in the water tank exceeds a predetermined amount.

In the water storage structure, a pump capable of pumping the water stored in the water tank to the ground can be provided.

In the water storage structure, it is desirable that the water storage tank is formed of a three-layer structure plate material in which both sides of a steel plate are coated with FRP layers. Here, the FRP is an abbreviation for Fiber Reinforced Plastics, which is a reinforcement made by combining fibers such as glass fiber and carbon fiber with epoxy resin, phenol resin, etc. to improve strength. means plastics.

In the water storage structure, the permeable layer is composed of 10 kg to 150 kg of cement-based solidifying material or neutral solidifying material, 1 L to 2 L of a granulating agent, and 20 L to 60 L of water per 1 cubic meter of masago soil. It is desirable that the mixture formed by adding and stirring is cast and solidified.

In the water storage structure, the granulating agent preferably contains a polymer compound comprising a complex of a magnesium salt of acrylic acid/dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

According to the present invention, it is possible to provide a water storage structure that can be easily constructed with a relatively small amount of materials and that is excellent in earthquake resistance and durability.

1 is a partially omitted vertical sectional view showing a water storage structure according to an embodiment of the present invention; FIG. FIG. 2 is a partially enlarged view of the water storage structure shown in FIG. 1; FIG. 3 is a partially enlarged view of FIG. 2; FIG. 2 is a partially omitted plan view showing a schematic configuration of the water storage structure shown in FIG. 1; FIG. 4 is a vertical cross-sectional view showing part of a water storage structure that is another embodiment; FIG. 4 is a vertical cross-sectional view showing part of a water storage structure that is another embodiment; FIG. 10 is a partially omitted vertical cross-sectional view showing a water storage structure of another embodiment; 8 is a partially enlarged view of the water storage structure shown in FIG. 7; FIG.

Hereinafter, water storage structures 100, 200 and the like according to embodiments of the present invention will be described with reference to FIGS. 1 to 8. FIG.

First, the water storage structure 100 constructed on the ground will be described based on FIGS. 1 to 4. FIG. As shown in FIGS. 1 and 2, the water storage structure 100 includes a water storage tank 10 buried in the ground G, and a water storage tank 10 standing upward from the water storage tank 10 with a lower opening 20b communicating with the water storage tank 10. a cylindrical body 20, a cover body 21 attached to an upper opening end 20a of the cylindrical body 20 so as to be openable and closable, and a downstream opening 30a of the cylindrical body 20 connected to the ground G , a roadbed layer 40 formed on the ground G with the underdrain pipe 30 embedded, and a permeable layer 50 formed on the roadbed layer 40. - 特許庁

The water tank 10 has a shape in which both ends of a cylindrical body are closed with hemispherical walls, and the outer surface of the water tank 10 is entirely convex. As shown in FIG. 2, the water tank 10 is formed of a three-layer structure plate material 10p in which both surfaces of a steel plate 10s are sandwiched between FRP layers 10f. The water tank 10 is buried in the ground G in such a posture that the axis of the cylindrical body forming its central portion is substantially horizontal. A plurality of openings 10a formed in the upper surface of the water tank 10 are connected to the lower openings 20b of the cylindrical body 20, respectively.

The water storage structure 100 is provided with an overflow pipe 11 that discharges the water to the outside of the water tank 10 when the water W in the water tank 10 exceeds a predetermined amount. The overflow pipe 11 has an upstream open end 11 a connected to a portion of the cylindrical body 20 near the lower opening 28 and communicates with the cylindrical body 20 and the inside of the water tank 10 .

As shown in FIG. 3, the underdrain pipe 30 has a large number of permeable through holes 32 formed throughout the pipe wall 31 thereof. Since the underdrain 30 is not limited to that shown in FIG. 4, other underdrain can be used as long as it is a tubular body formed of a pipe wall having water permeability. As shown in FIG. 4, the underdrain pipe 30 is arranged to have a leaf vein shape in a plan view so as to spread evenly over the entire ground G in the horizontal direction, but it is not limited to this.

The roadbed layer 40 formed on the ground G with the underdrain 30 buried therein is made of a cement-based solidifying material (or a neutral solidifying material) for granulated soil, crushed stone (at least one of crusher run and recycled crusher run), and earth materials. , an agglomerating agent, and water are added and stirred, and the mixture is placed on the ground G and solidified. A granulating agent for forming the roadbed layer 40 is an aqueous solution containing a polymer compound composed of a composite of a magnesium salt of a copolymer of acrylic acid and dimethylaminoethyl methacrylate and polyethyleneimine (available from Global Research Institute Co., Ltd.). (trade name: diluted aqueous solution of GB-2000) is used.

As shown in FIG. 3, the permeable layer 50 formed on the roadbed layer 40 is a mixture formed by adding and stirring a cement-based solidifying material, a granulating agent, and water to granite soil. is placed on the roadbed layer 40 and solidified. In the present embodiment, the permeable layer 50 is a mixture formed by adding and stirring 10 kg of a cement-based solidifying material, 2 L of a granulating agent, and 40 L of water to 1 cubic meter of masago soil. After casting on the layer 40, it is spread evenly and solidified. The amount of cement-based solidifying material, granulating agent and water mixed with respect to 1 cubic meter of masago soil is not limited to the values described above, and can be changed according to the conditions of the construction site. A neutral solidifying material may be used in place of the cement-based solidifying material.

In the present embodiment, the granulating agent for forming the permeable layer 50 is an aqueous solution containing a polymer compound composed of a composite of a magnesium salt of an acrylic acid/dimethylaminoethyl methacrylate copolymer and polyethyleneimine (finite A diluted aqueous solution of GB-2000 (product name of the company Global Research Institute) is used.

A three-dimensional network structure is formed inside the permeable layer 50 by the interaction of the granite, the cement-based solidifying material, and the granulating agent, thereby exhibiting excellent water permeability and water retention. In addition, since the three-dimensional network structure formed inside the permeable layer 50 is strongly solidified by the cement-based solidifying material, fine particles do not flow out even if rainwater permeates, and excellent water permeability and water retention can be achieved. It can be maintained for a long time.

In addition, since a three-dimensional network structure is also formed inside the roadbed layer 40 by the interaction of the granite soil, crushed stone, soil material, cement-based solidifying material, and granulating agent, excellent water permeability and water retention are achieved. Since the three-dimensional network structure inside the roadbed layer 40 is also strongly solidified by the cement-based solidifying material, fine particles do not flow out even if rainwater penetrates, and excellent water permeability and water retention are achieved. It can be maintained for a long time.

In addition, since the roadbed layer 40 is not limited to the above-described ones, cement-based solidification material is used for crushed stone (one or more of crusher run, recycled crusher run, particle size adjusted crushed stone, recycled particle size adjusted crushed stone, single grain crushed stone, etc.) and earth materials. (or a neutral solidifying material) and water are added and stirred to form a mixture, which is placed on the ground G and solidified.

As shown in FIG. 1, the water storage structure 100 is provided with a pump 12 for pumping up the water W stored in the water tank 10 to the ground. Although the pump 12 is manually operated, it is not so limited and an electric or engine driven pump can also be used.

As shown in FIGS. 1 to 3, rainwater that has fallen on the surface of the permeable layer 50 permeates the permeable layer 50, sequentially passes through the permeable layer 50 and the roadbed layer 40, and flows into the underdrain pipe 30 through the through holes 32. do. The rainwater that has flowed into the underdrain pipe 30 flows through the underdrain pipe 30 toward the opening 30a, flows into the cylindrical body 20 from the opening 30a, passes through the cylindrical body 20, and enters the water tank 10. , and stored in the water tank 10 .

Since the water W stored in the water tank 10 can be pumped up by the pump 12, it can be used for various purposes. In addition, since the rainwater that has fallen on the surface of the permeable layer 50 is filtered in the process of passing through the permeable layer 50 including the three-dimensional network structure, it flows into the water tank 10, so the water W stored in the water tank 10 is compared. It is in a relatively clean state. Therefore, if the stored water W pumped up by the pump 12 is subjected to appropriate purification treatment (filtration treatment, chemical addition, etc.), it can be used as drinking water in emergencies such as natural disasters.

A so-called manhole structure is formed by the cylindrical body 20 erected on the upper surface of the water tank 10 and the cover body 21 for opening and closing the open end 20a of the cylindrical body 20. By opening the lid 21, inspection and maintenance of the inside of the cylindrical body 20 and the water tank 10 can be performed.

As shown in FIGS. 1 and 2, the water tank 10 is formed of a three-layer structure plate material 10p in which both sides of a steel plate 10s are sandwiched between FRP layers 10f. Excellent pressure resistance, earthquake resistance and durability. In addition, since the inner surface of the water tank 10 formed of the three-layer structure plate material 10p is covered with the FRP layer 10f, it is effective in keeping the stored water W clean. Furthermore, since the water tank 10 may be manufactured in advance at a factory, brought to the construction site and buried in the ground G, it is possible to reduce the number of materials and facilitate construction.

Next, another embodiment will be described based on FIGS. 5 and 6. FIG. In FIGS. 5 and 6, the same reference numerals as those in FIGS. 1 to 4 are given to the parts common to the constituent parts of the water storage structure 100 shown in FIGS. 1 to 4, and the description thereof is omitted.

FIG. 5 is a partially omitted vertical sectional view showing a state in which a parking lot is formed above the underdrain 30. A permeable layer 50 is formed on the underdrain 30, and a permeable pavement layer is formed on the permeable layer 50. FIG. 60 are formed. The permeable layer 50 is formed by adding and agitating a cement-based solidifying material, a granulating agent, and water to crushed stone (at least one of crusher run and recycled crusher run), and pouring a mixture onto the underdrain pipe 30. It is set and solidified. The pavement layer 60 is formed by placing one or more of an open-grade asphalt mixture, a porous asphalt mixture, and a modified asphalt mixture on the permeable layer 50 .

Rainwater falling on the surface of the pavement layer 60 permeates the permeable pavement layer 60, permeates through the pavement layer 60, permeates into the permeable layer 50, and is filtered in the process of permeating the permeable layer 50. After that, the water flows into the underdrain pipe 30, so that the same functions and effects as those of the water storage structure 100 shown in FIG. 1 can be obtained.

FIG. 6 is a partially omitted vertical sectional view showing a state in which artificial turf 70 is planted above underdrain 30. Permeable layer 50 is formed on underdrain 30, and artificial turf 70 is formed on permeable layer 50. is planted. The permeable layer 50 is formed by adding and stirring a cement-based solidifying material (or a neutral solidifying material), a granulating agent, and water to granite soil, crushed stone (at least one of crusher run and recycled crusher run), and earth materials. It is formed by placing the mixture thus formed on the ground G and solidifying it.

Rainwater falling on the artificial turf 70 permeates the permeable layer 50, is filtered in the process of permeating the permeable layer 50, and then flows into the underdrain pipe 30, so the same function as the water storage structure 100 shown in FIG. , the effect can be obtained. It is also possible to plant natural grass (not shown) on the permeable layer 50 instead of the artificial grass 70. In this case also, the same functions and effects as those of the water storage structure 100 shown in FIG. 1 can be obtained. be able to.

Next, another embodiment of a water storage structure 200 will be described with reference to FIGS. 7 and 8. FIG. In FIGS. 7 and 8, the same reference numerals as those in FIGS. 1 to 4 are given to the parts common to the constituent parts of the water storage structure 100 shown in FIGS. 1 to 4, and the description thereof is omitted.

As shown in FIGS. 7 and 8, in a water storage structure 200, the underdrain pipe 30 in the water storage structure 100 shown in FIGS. there is The water tank 10 is buried in the ground G, the roadbed layer 40 is formed on the ground G, and the permeable layer 50 is formed on the roadbed layer 40 . A large number of through holes 23 are formed in the lower part of the cylindrical body 22 (the part in contact with the ground G).

Rainwater that has fallen on the surface of the permeable layer 50 permeates the permeable layer 50 , passes through the permeable layer 50 and the roadbed layer 40 in sequence, and permeates into the ground G. The rainwater that has penetrated into the ground G descends through the ground G, flows into the tubular body 22 through the through holes 23 of the tubular body 22, and drops into the water tank 10 via the tubular body 22. , is stored in the water tank 10 .

Rainwater that has fallen on the surface of the permeable layer 50 is filtered in the process of passing through the permeable layer 50 including the three-dimensional network structure and then flows into the water tank 10, so the water W stored in the water tank 10 is relatively clean. can be kept in good condition.

Since the water storage structure 200 shown in FIGS. 7 and 8 omits the underdrain pipe 30 shown in FIGS. 1 and 2, it can be suitably constructed when the area of the ground G is relatively small. Moreover, since piping of the underdrain pipe 30 becomes unnecessary, the construction process can be simplified. The functions of other parts and the effects obtained thereby are the same as those of the water storage structure 100 shown in FIGS.

Since the water storage structures 100, 200 and the like described with reference to FIGS. , once stored in the storage tank 10 and then discharged, the outflow of rainwater to the river is suppressed, and disaster mitigation and disaster prevention can be achieved. Moreover, since the storage tank 10 has earthquake resistance, there is no fear of damage when an earthquake occurs. Furthermore, as described above, the water W stored in the storage tank 10 can be pumped up by the pump 12 and used for various purposes, so rainwater can be reused (effectively utilized).

The water storage structures 100, 200, etc. described with reference to FIGS. 1 to 8 are examples of the water storage structures according to the present invention, and the water storage structures according to the present invention are limited to the water storage structures 100, 200, etc. described above. not.

INDUSTRIAL APPLICABILITY The water storage structure according to the present invention can be widely used in industrial fields such as the civil engineering and construction industry as water storage means for grounds, parking lots, squares, and the like.

10 water tank 10a, 30 opening 10f FRP layer 10p three-layer structure plate material 10s steel plate 11 overflow pipe 11a, 20a opening end 12 pump 20, 22 cylindrical body 20b, 28 lower opening 21 lid 23, 32 through hole 30 underdrain Pipe 30a Opening 31 Pipe wall 40 Roadbed layer 50 Permeable layer 60 Pavement layer 70 Artificial turf W Retained water

Claims (9)

a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the cylindrical body;
a roadbed layer provided on the ground with the underdrain pipe buried;
a permeable layer provided on the roadbed layer;
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing a mixture on the roadbed layer. A reservoir structure that has been solidified. a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the cylindrical body;
a permeable layer provided on the ground with the underdrain pipe buried;
a pavement layer provided on the permeable layer,
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing the mixture on the ground. A reservoir structure that has been solidified. a water tank buried in the ground;
a cylindrical body erected upward from the water tank with its lower part communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
an underdrain pipe piped on the ground in a state in which a downstream opening is communicated with the cylindrical body;
a permeable layer provided on the ground with the underdrain pipe buried;
An artificial turf or natural turf planted on the permeable layer,
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing the mixture on the ground. A reservoir structure that has been solidified. a water tank buried in the ground;
a water-permeable cylindrical body erected upward from the water tank with its lower portion communicating with the water tank;
a cover attached to an upper open end of the cylindrical body so as to be openable and closable;
a roadbed layer provided on the ground;
a permeable layer provided on the roadbed layer;
The outer surface of the water tank is configured with a convex curved surface,
The permeable layer is formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, a granulating agent, and water to granulated sand, and placing a mixture on the roadbed layer. A reservoir structure that has been solidified. 5. The water storage structure according to any one of claims 1 to 4, further comprising an overflow pipe for discharging the water out of the water tank when the amount of water stored in the water tank exceeds a predetermined amount. The water storage structure according to any one of claims 1 to 5, further comprising a pump capable of pumping the water stored in the water tank to the ground. The water storage structure according to any one of claims 1 to 6, wherein the water storage tank is formed of a three-layer structure plate material in which both sides of a steel plate are coated with FRP layers. For the permeable layer, 10 kg to 150 kg of cement-based solidifying material or neutral solidifying material, 1 L to 2 L of granulating agent, and 20 L to 60 L of water are added and stirred per 1 cubic meter of masago soil. The water storage structure according to any one of claims 1 to 7, wherein the formed mixture is cast and solidified. 9. The water storage structure according to claim 8, wherein said granulating agent contains a polymer compound comprising a complex of magnesium salt of dimethylaminoethyl acrylic acid/methacrylate copolymer and polyethyleneimine.

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