JP2022026890A - Water storage structure - Google Patents

Abstract

To provide a water storage structure that can be easily constructed with relatively few materials and has excellent earthquake resistance and durability.SOLUTION: A water storage structure 100 comprises a water reservoir 10 buried in the ground G, a cylindrical body 20 standing upward from the water reservoir 10 with a lower opening 20b connected to the water reservoir 10, a lid 21 that can be opened and closed on an upper opening end 20a of the cylindrical body 20, a culvert pipe 30 piped on the ground G with a downstream opening 30a connected to the cylindrical body 20, a roadbed layer 40 formed on the ground G with the culvert pipe 30 buried, and a permeable layer 50 formed on the roadbed layer 40. The outer surface of the water reservoir 10 consists of a convex curved surface, and the permeable layer 50 is formed by pouring and solidifying a mixture of sandy soil, cement-based solidifier, granulating agent, and water on the roadbed layer 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water storage structure for infiltrating and storing rainwater or the like that has poured into a ground, a parking lot, a plaza, or the like.

In order to make effective use of rainwater, water storage structures that allow rainwater that has fallen to the ground to permeate into the ground and store it in a water tank buried underground have been proposed to have various structures and functions. Examples of those related to the present invention include the "rainwater underground filtration water supply device" described in Patent Document 1 and the "underground water tank for agricultural land" described in Patent Document 2.

In the "rainwater underground filtration water supply device" described in Patent Document 1, a lawn stretched on the ground is used as the first filtration layer, and a second filtration layer covered with sand or stone is formed under the lawn. A waterproof sheet is laid on the bottom of the filtration layer, a part of the waterproof sheet is opened, and a filtered water storage tank having an inflow port formed at the upper part is provided below the opening. A raw water storage tank for storing watered rainwater is provided, and a sprinkler pipe for sprinkling water from the raw water storage tank and the filtered water storage tank to the filter layer via a sprinkler pump is buried in the filter layer and the filtered water is stored. The tank is equipped with a water supply pump that supplies water to equipment that uses filtered water.

In the "underground buried storage tank for agricultural land" described in Patent Document 2, resin box members having openings for communicating inside and outside are arranged vertically, horizontally, and in the height direction to provide a water storage space. In the underground storage tank for agricultural land, which consists of a box-arranged structure that forms and bears the load from the surroundings and an impermeable protective layer that covers at least the bottom surface and the side surface of the box-arranged structure, the box member is missing. By not arranging the boxes, an inspection space is formed that penetrates the inside of the box array structure in the height direction, and this inspection space is extended to the ground, and the part of the inspection space between the box array structure and the ground is formed. It is surrounded by a box member and an opening / closing lid is provided at a portion where this inspection space opens to the ground.

Japanese Unexamined Patent Publication No. 2005-16269 Japanese Unexamined Patent Publication No. 2009-150179

The "rainwater underground filtration water supply device" described in Patent Document 1 has advantages such as being able to reuse clean water because it circulates and filters rainwater, and can be used as an emergency water supply tank. However, since a hollow water tank must be constructed in the ground, a lot of construction materials and a lot of labor are required to form a strong support structure to support it. In addition, if a large earthquake occurs and the surrounding ground changes (faults, cracks, etc.), this "rainwater underground filtration water supply device" may damage the water tank and waterproof sheet and leak stored water. There is.

In the "underground buried storage tank for agricultural land" described in Patent Document 2, since a structure in which a plurality of blocks are combined is arranged in the water storage tank, the structure of the water storage tank itself is simplified, but a large number of blocks are used. A block is required, and the block assembly work is 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, an object to be solved by the present invention is to provide a water storage structure which can be easily constructed with a relatively small amount of materials and has excellent earthquake resistance and durability.

The first water storage structure according to the present invention is
A water tank buried in the ground and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the roadbed layer provided on the ground with the underdrain pipe buried,
The permeable layer provided on the roadbed layer is provided.
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto 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 and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the permeable layer provided on the ground with the underdrain pipe buried,
With a pavement layer provided on the permeable layer,
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the ground layer. 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 and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the permeable layer provided on the ground with the underdrain pipe buried,
With artificial turf or natural turf planted on the permeable layer,
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the ground layer. 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 and
A tubular body having water permeability that stands upward from the water tank with the lower part communicating with the water tank.
A lid that can be opened and closed at the upper opening end of the cylindrical body,
The roadbed layer provided on the ground and
The permeable layer provided on the roadbed layer is provided.
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the roadbed layer. It is characterized by being solidified.

In the water storage structure, an overflow pipe may be provided to discharge the stored water in the water storage tank to the outside of the water storage tank when the amount of water stored in the water storage tank exceeds a predetermined amount.

In the water storage structure, a pump capable of pumping the stored water in the water storage 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 an FRP layer. Here, the FRP is an abbreviation for Fiber Reinforced Plastics, and is reinforced by combining fibers such as glass fibers and carbon fibers with epoxy resin, phenol resin, or the like to improve the strength. Means plastic fiber.

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

In the water storage structure, it is desirable that the agglomerating agent contains a polymer compound composed of a composite of a magnesium salt of an acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to easily construct a water storage structure with a relatively small amount of materials, and it is possible to provide a water storage structure having excellent earthquake resistance and durability.

It is a partially omitted vertical sectional view which shows the water storage structure which is an embodiment of this invention. It is a partially enlarged view of the water storage structure shown in FIG. It is a partially enlarged view of FIG. It is a partially omitted plan view which shows the schematic structure of the water storage structure shown in FIG. It is a vertical sectional view which shows a part of the water storage structure which is another embodiment. It is a vertical sectional view which shows a part of the water storage structure which is another embodiment. It is a partially omitted vertical sectional view which shows the water storage structure which is another embodiment. It is a partially enlarged view of the water storage structure shown in FIG. 7.

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

First, the water storage structure 100 constructed on the ground will be described with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, the water storage structure 100 is erected upward from the water storage tank 10 in a state where the water storage tank 10 buried in the ground G and the lower opening 20b are communicated with the water storage tank 10. On the ground G in a state where the tubular body 20 is formed, the lid 21 which is openably and closably attached to the opening end 20a above the tubular body 20, and the opening 30a on the downstream side are communicated with the tubular body 20. It is provided with an underdrain pipe 30 piped to the above, a roadbed layer 40 formed on the ground G with the underdrain pipe 30 buried, and a water permeable layer 50 formed on the roadbed layer 40.

The water tank 10 has a shape in which both ends of a cylindrical body are closed by hemispherical walls, and the outer surface of the water tank 10 is entirely formed of a convex curved surface. As shown in FIG. 2, the water storage 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. The water storage tank 10 is buried in the ground G in a posture in which the axis of the cylindrical body forming the central portion thereof is substantially horizontal. The lower opening 20b of the tubular body 20 is connected to each of the plurality of openings 10a opened in the upper surface portion of the water storage tank 10.

In the water storage structure 100, an overflow pipe 11 is provided to discharge the stored water W in the water storage tank 10 to the outside of the water storage tank 10 when the amount of water stored in the water storage tank 10 exceeds a predetermined amount. The upstream end 11a of the overflow pipe 11 is connected to a portion of the tubular body 20 near the lower opening 28 and communicates with the tubular body 20 and the inside of the water storage tank 10.

As shown in FIG. 3, the underdrain pipe 30 is provided with a large number of through holes 32 having water permeability throughout the pipe wall 31. Since the underdrain pipe 30 is not limited to the one shown in FIG. 4, any other underdrain pipe 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 piped so as to have a leaf vein shape in a plan view so as to spread evenly in the horizontal direction over the entire ground G, but the present invention is not limited to this.

The roadbed layer 40 formed on the ground G with the underdrain pipe 30 buried is a cement-based solidifying material (or neutral solidifying material) for decomposed granite soil, crushed stone (at least one of crusher run and regenerated crusher run) and soil material. , And an agglomerating agent and water are added and stirred to form a mixture, which is cast on the ground G and solidified. The agglomerating agent for forming the roadbed layer 40 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 (Global Research Institute, Inc.). Product name: GB-2000 diluted aqueous solution) 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, an agglomerating agent, and water to decomposed granite soil. Was placed on the roadbed layer 40 and solidified. In the present embodiment, the permeable layer 50 is a roadbed of a mixture formed by adding and stirring 10 kg of a cement-based solidifying material, 2 L of agglomerating agent, and 40 L of water with respect to 1 cubic meter of decomposed granite soil. After being placed on the layer 40, it was spread and solidified. Since the mixing amount of the cement-based solidifying material, the agglomerating agent and water with respect to 1 cubic meter of decomposed granite soil is not limited to the above-mentioned numerical values, it can be changed according to the conditions of the construction site. A neutral solidifying material can also be used instead of the cement-based solidifying material.

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

Since a three-dimensional network structure formed by the interaction of decomposed granite soil, a cement-based solidifying material and an agglomerating agent is formed inside the water-permeable layer 50, excellent water permeability and water retention are exhibited. Further, since the three-dimensional network structure formed inside the water 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 are achieved. Can be maintained for a long period of time.

Further, since a three-dimensional network structure formed by the interaction of decomposed granite soil, crushed stone, soil material, cement-based solidifying material and agglomerating agent is also formed inside the roadbed layer 40, it has excellent water permeability and water retention. 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 permeates, and excellent water permeability and water retention are achieved. Can be maintained for a long period of time.

Since the roadbed layer 40 is not limited to the above-mentioned one, it is a cement-based solidifying material for crushed stone (one or more of crusher run, regenerated crusher run, grain size adjusted crushed stone, regenerated grain size adjusted crushed stone, single grain crushed stone, etc.) and soil material. It can also be formed by casting (or a neutral solidifying material) and water into a mixture formed by adding and stirring the mixture on the ground G and solidifying the mixture.

As shown in FIG. 1, in the water storage structure 100, a pump 12 for pumping the stored water W in the water storage tank 10 to the ground is provided. Although the pump 12 is a manual type, but is not limited to this, an electric type or an engine driven type pump can also be used.

As shown in FIGS. 1 to 3, the 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 from the through hole 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 tubular body 20 from the opening 30a, and passes through the inside of the tubular body 20 into the water tank 10. It falls to and is stored in the water tank 10.

Since the stored water W stored in the water storage tank 10 can be pumped up by the pump 12, it can be used for various purposes. Further, 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 and then flows into the water tank 10, so that the stored water W in the water tank 10 is compared. It is in a clean state. Therefore, if the stored water W pumped up by the pump 12 is appropriately purified (filtered, added with chemicals, etc.), it can be used as drinking water in an emergency such as a natural disaster.

A so-called manhole structure is formed by the tubular body 20 erected on the upper surface of the water storage tank 10 and the lid 21 that opens and closes the opening end 20a of the tubular body 20 so as to be able to open and close. The lid 21 can be opened to inspect and maintain the inside of the tubular body 20 and the water tank 10.

As shown in FIGS. 1 and 2, the water storage 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, and the outer surface thereof is entirely formed of a convex curved surface. It has excellent pressure resistance, earthquake resistance, and durability. Further, since the inner surface of the water storage tank 10 formed of the three-layer structure plate material 10p is covered with the FRP layer 10f, it is also effective in keeping the stored water W clean. Further, as the water storage tank 10, it is sufficient to bring the water tank 10 manufactured in advance to the construction site and bury it in the ground G, so that the number of materials can be reduced and the construction can be facilitated.

Next, other embodiments will be described with reference to FIGS. 5 and 6. In FIGS. 5 and 6, the parts common to the constituent parts of the water storage structure 100 shown in FIGS. 1 to 4 are designated by the same reference numerals as those in FIGS. 1 to 4 and the description thereof will be omitted.

FIG. 5 is a partially omitted vertical cross-sectional view showing a state in which a parking lot is formed above the underdrain pipe 30, and is a pavement layer having a water permeable layer 50 formed on the underdrain pipe 30 and having water permeability on the water permeable layer 50. 60 is formed. The permeable layer 50 hits a mixture formed by adding and stirring a cement-based solidifying material, an agglomerating agent, and water to crushed stone (at least one of a crusher run and a regenerated crusher run) on an underdrain pipe 30. It was set up and solidified. The pavement layer 60 is formed by pouring one or more of an open particle asphalt mixture, a porous asphalt mixture, and a modified asphalt mixture onto the water permeable layer 50.

The rainwater that has fallen on the surface of the pavement layer 60 permeates the pavement layer 60 having water permeability, permeates through the pavement layer 60, permeates into the water permeation layer 50, and is filtered in the process of permeating the water permeation layer 50. After that, since it flows into the underdrain pipe 30, the same action and effect as the water storage structure 100 shown in FIG. 1 can be obtained.

FIG. 6 is a partially omitted vertical cross-sectional view showing a state in which the artificial turf 70 is planted above the underdrain pipe 30, in which a water permeable layer 50 is formed on the underdrain pipe 30 and the artificial turf 70 is formed on the water permeable layer 50. Has been planted. The permeable layer 50 adds and stirs cement-based solidifying material (or neutral solidifying material), agglomerating agent, and water to decomposed granite soil, crushed stone (at least one of crusher run and regenerated crusher run) and soil material. It is formed by casting and solidifying the mixture formed in the above-mentioned manner on the ground G.

The rainwater that has poured onto 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. , The effect can be obtained. It is also possible to plant natural turf (not shown) on the permeable layer 50 instead of the artificial turf 70, and in that case, the same action and effect as the water storage structure 100 shown in FIG. 1 can be obtained. be able to.

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

As shown in FIGS. 7 and 8, in the water storage structure 200, the underdrain pipe 30 in the water storage structure 100 shown in FIGS. 1 and 2 is omitted, and the tubular body 22 is erected in place of the tubular body 20. There is. The water storage tank 10 is buried in the ground G, a roadbed layer 40 is formed on the ground G, and a water permeable layer 50 is formed on the roadbed layer 40. A large number of through holes 23 are provided in the lower portion of the tubular body 22 (the portion in contact with the ground G).

The rainwater that has poured onto 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 permeates into the ground G. The rainwater that has permeated into the ground G descends in the ground G, flows into the tubular body 22 from the through hole 23 of the tubular body 22, and falls into the water tank 10 via the tubular body 22. , Stored in the water tank 10.

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, and then flows into the water tank 10, so that the stored water W in the water tank 10 is relatively clean. Can be kept in a good condition.

Since the underdrain pipe 30 shown in FIGS. 1 and 2 is omitted from the water storage structure 200 shown in FIGS. 7 and 8, it can be suitably constructed when the area of the ground G is relatively small. Further, since the pipe of the underdrain pipe 30 is not required, the construction process can be simplified. The functions of the other parts and the effects obtained by the functions are the same as those of the water storage structure 100 shown in FIGS. 1 and 2.

Since the water storage structures 100, 200 and the like described with reference to FIGS. 1 to 8 can store the rainwater falling on the ground in the water tank 10 relatively quickly, the rainwater falling during the guerrilla rainstorms that occur frequently in recent years can be stored. As a result of being once stored in the storage tank 10 and then discharged, rainwater outflow to the river is suppressed, and disaster mitigation and disaster prevention can be achieved. Further, since the storage tank 10 has earthquake resistance, there is no concern about damage when an earthquake occurs. Further, as described above, since the stored water W in the storage tank 10 can be pumped up by the pump 12 and used for various purposes, rainwater can be reused (effectively utilized).

The water storage structures 100, 200 and the like described with reference to FIGS. 1 to 8 exemplify the water storage structure according to the present invention, and the water storage structure according to the present invention is limited to the above-mentioned water storage structures 100, 200 and the like. Not done.

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 a water storage means in a ground, a parking lot, a plaza, or the like.

10 Water tank 10a, 30 Opening 10f FRP layer 10p Three-layer structure plate 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 Water permeable layer 60 Pavement layer 70 Artificial turf W Reservoir

Claims (9)

A water tank buried in the ground and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the roadbed layer provided on the ground with the underdrain pipe buried,
The permeable layer provided on the roadbed layer is provided.
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the roadbed layer. A water storage structure that is solidified. A water tank buried in the ground and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the permeable layer provided on the ground with the underdrain pipe buried,
With a pavement layer provided on the permeable layer,
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the ground layer. A water storage structure that is solidified. A water tank buried in the ground and
A tubular body erected upward from the water tank with the lower part communicating with the water tank, and
A lid that can be opened and closed at the upper opening end of the cylindrical body,
An underdrain pipe piped on the ground with the opening on the downstream side communicating with the tubular body, and
With the permeable layer provided on the ground with the underdrain pipe buried,
With artificial turf or natural turf planted on the permeable layer,
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the ground layer. A water storage structure that is solidified. A water tank buried in the ground and
A tubular body having water permeability that stands upward from the water tank with the lower part communicating with the water tank.
A lid that can be opened and closed at the upper opening end of the cylindrical body,
The roadbed layer provided on the ground and
The permeable layer provided on the roadbed layer is provided.
The outer surface of the water tank is composed of a convex curved surface.
A mixture formed by adding and stirring a cement-based solidifying material or a neutral solidifying material, an agglomerating agent, and water to decomposed granite soil is poured onto the roadbed layer. A water storage structure that is solidified. The water storage structure according to any one of claims 1 to 4, wherein an overflow pipe is provided to discharge the stored water in the water storage tank to the outside of the water storage tank when the amount of water stored in the water storage tank exceeds a predetermined amount. The water storage structure according to any one of claims 1 to 5, wherein a pump capable of pumping the stored water in the water storage tank to the ground is provided. 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 an FRP layer. The permeable layer adds and stirs 10 kg to 150 kg of a cement-based solidifying material or a neutral solidifying material, 1 L to 2 L of agglomerating agent, and 20 L to 60 L of water with respect to 1 cubic meter of decomposed granite soil. The water storage structure according to any one of claims 1 to 7, wherein the formed mixture is cast and solidified. The water storage structure according to claim 8, wherein the agglomerating agent contains a polymer compound composed of a composite of a magnesium salt of an acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine.

Images