JP2002317486A - Rainwater outflow restricting facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a rain water outflow restricting and recycling facility for storing rain water in a water collecting tank for recycle and for infiltrating water into the ground from a side surface of the water collecting tank when the amount of rainfall is large. SOLUTION: This rain water outflow restricting and recycling facility is formed of the water collecting tank 1 having a side surface opening in a side wall thereof, an inflow pipe 12 for collecting rain water, a water level sensor 14, a water intake pipe 15 for pumping water inside of the tank, and a water supply pipe 13 for supplying water from the water service on the basis of a signal from the water level sensor. A water passing duct 3 for gradually passing water is installed in the side surface opening, and a water permeable sheet 42 is stretched around the inner surface inside of the ground outside of the side surface opening, and a permeation chamber 4 filled with the crushed stones 41 inside thereof is arranged inside thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to rainwater falling on public lands such as roads and school grounds, individual houses, apartment houses, public facilities and the like (hereinafter collectively referred to as "houses").
The present invention relates to a rainwater runoff control facility that suppresses runoff of rainwater that has fallen into the sewer and that can be used effectively to replace a regulating pond that is usually installed with the development of residential land.

[0002]

2. Description of the Related Art In order to suppress the temporary large outflow of rainwater into a sewer, a regulation pond with a predetermined capacity is provided for the development of residential land of a certain size or more, and it is obligated by law to discharge it from this to the sewer. I have. However, it is not preferable from the viewpoint of effective use of the national land that the fixed area must be devoted to the regulating pond even if the residential land is built, and the sales area is also reduced for the developers. There is a problem that there is a danger of accidents for children and the like. In addition, as urbanization progresses, towns and other public lands, such as roads and school grounds, are covered with structures and asphalt, and rain is drained directly from the rainwater mains to rivers, causing the water holding capacity of the soil to decline extremely. It has also been pointed out that the natural cycle has changed, causing frequent heavy rainfall and light rain due to climate change, causing urban floods, heat island phenomena, depletion of spring water, and land subsidence.

[0003]

To cope with such a problem, an infiltration tank is provided downstream of a rain gutter in a house or the like, and rainwater permeates underground from the infiltration tank to suppress the outflow to the sewer. However, since the conventional infiltration tank has a structure that penetrates into the ground from the bottom,
There are problems such as permeation into soil without natural purification.

The present invention solves this problem by storing rainwater in a water collecting tank, suppressing the inflow to the sewer by infiltrating into the surrounding ground through an opening on the side, and reusing the stored water as much as possible. In addition to reducing water usage by using it,
The aim is to realize a rainwater runoff control facility that does not allow rainwater on the roof surface to flow out of the premises by discharging rainwater that cannot be reused while suppressing it and infiltrating it into the surrounding basement.

[0005]

SUMMARY OF THE INVENTION The present invention firstly provides a water collecting tank buried in the ground which is connected to a water collecting groove of a road or the like. Opening,
Attached with a water flow duct that allows water to gradually pass through this side opening, and in the ground around the water collecting tank outside the water flow duct, an infiltration chamber filled with crushed stone is disposed. Secondly, it is connected to a water collection tank buried in the ground of a house or the like and having a horizontally long side opening on a side wall, and a rain gutter of a house or the like, and is opened in this water collection tank. An inflow pipe, a water level sensor for detecting a water level in the water collection tank, an intake pipe for pumping up water in the water collection tank, and a makeup water pipe for replenishing water in the water collection tank with a signal from the water level sensor. In the rainwater outflow suppression treatment facility comprising: a water passage duct that allows water to gradually pass through a side opening provided in the water collection tank side wall, and gradually lowers water to a position lower than the side opening of the water collection tank side wall. With check valve Attach a fission pipe, place a permeation chamber filled with crushed stone inside the ground around the water collecting tank outside the water flow duct, and open the water flow duct and the orifice pipe with the check valve. It is a rainwater outflow suppression treatment facility characterized by the fact that, preferably, the water flow duct has a front plate having an opening at a lower part in a shape to close a horizontally long opening provided on a side wall of a water collecting tank, and a front plate having an opening outside the front plate. A projecting outer plate and a dam plate whose bottom is connected to the bottom of the outer plate and whose top is located lower than the top of the outer plate and is arranged inside the outer plate. The rainwater runoff control facility according to the above, wherein a water passage hole is provided, and a distance between the outer plate and the weir plate is narrower on a weir plate bottom side than on a weir plate top side.

[0006]

[Embodiment 1] FIG. 1 shows a first embodiment of the present invention.
FIG. 5 is a vertical cross-sectional view of the rainwater outflow suppression treatment facility according to the embodiment of the present invention, where P is a pavement, U is a U-shaped groove disposed around the pavement,
1 is a water collecting tank connected to the U-shaped groove U and buried in the ground, 11 is a horizontally long side opening provided on a side wall of the water collecting tank 1 not connected to the U-shaped groove U, and 3 is a side opening 11 The water passage duct, which allows the water attached to the water passage to pass gradually,
This is an infiltration chamber that is arranged in the ground around the water collecting tank 1 outside the pit and is filled with crushed stone 41.

[0007] Generally, an L-shaped or U-shaped cross-sectional groove is provided around a paved site such as a road or a school ground.
Although rainwater collected in the storage basin is made to flow to the sewer, in the present invention, a water collection tank 1 is provided in place of the storage basin, and a water passage duct 3 passes through a side opening 11 on a side wall of the water collection tank 1. Then, water is caused to flow into the infiltration chamber 4, from which the water gradually permeates into the surrounding ground, thereby suppressing the inflow of rainwater into the sewer.

[0008] The size of the water collecting tank 1 and the intervals at which it is installed are determined as appropriate in consideration of the area where rainwater is collected, the geology of the ground to be penetrated, and the like. The side opening 11 has a horizontally long shape and is provided horizontally at a position of 250 to 300 mm from the lower end of the water collecting tank 1. on the other hand,
FIG. 3 is a partial cross-sectional perspective view showing the vicinity of the water flow duct 3 in this embodiment. The water passage duct 3 has an outer shape in which a cylinder is placed horizontally and divided in half vertically by a central axis. A front plate 31 is attached to the split surface, and a horizontally long opening 311 having a slit over the entire length is provided at a lower portion of the front plate 31. Is provided. Near the bottom of the half-cylindrical outer plate 32, a number of small-diameter water holes 321 through which water passes are provided. A half-split cylindrical weir plate 33 is also inserted inside the outer plate 32, and the top of the weir plate 33 is a front plate 31.
The bottom is joined to the front plate 31 at the upper part of the water passage hole 321. The radius of the weir plate 33 is the outer plate 32
The distance between the weir plate 33 and the outer plate 32 is smaller at the bottom of the weir plate than at the top of the weir plate, and is the narrowest at the water passage hole 321.

When the water level in the water collecting tank 1 exceeds the top of the weir plate 33, the water flows down the gap between the weir plate 33 and the outer plate 32 and penetrates into the permeation chamber 4 through the water passage hole 321 at the bottom. Opening at the bottom of the front plate 31
311 is an outlet of water from the water collection tank 1. Since the top of the weir plate 33 is higher than the opening 311 of the front plate 31, dust and the like floating on the water surface are prevented from flowing out beyond the weir plate 33, and the head pressure of this height is always applied. be able to. In FIG. 3, the water level in the normal state is the top of the weir plate 33. In FIGS. 1 and 2, water is always stored at the height of the water flow duct 3 and mud is settled at the bottom. Is desirably discharged. During rainfall, the water level temporarily exceeds the height of the water flow duct 3, and if the water level further rises while being gradually discharged from the duct 3 into the infiltration chamber 4, U
The discharge from the groove U is also performed.

The water passage duct 3 is fitted into the side opening 11 of the water collecting tank 1 as shown in FIG. 3, or externally attached to the side opening 11 of the water collecting tank 1, and the mounting method is optional. However, it is necessary to slightly change the mounting structure such as the flange accordingly. The infiltration chamber 4 is provided, for example, at a height of 1200 mm and a depth of 800 mm on a surface of the water collecting tank 1 that is not connected to the U-shaped groove U, and after spraying lime on the excavation surface, the inside is filled with crushed stone 41. . Filling the space with crushed stone usually creates about 30% voids. The water that has entered the infiltration chamber 4 through the water passage duct 3 is temporarily held in this space, and gradually permeates into the surrounding ground and is discharged. If the size of the crushed stone 41 to be filled in the infiltration chamber 4 is larger than the diameter of the water passage hole 321 of the water passage duct 3, the surrounding crushed stone enters the inside of the water passage duct 3 from the water passage hole 321 at the bottom. There is no danger.
The slightly invaded sediment will be flushed out the next time the water flows from the inside out, so it can be easily recovered even if it becomes clogged.
The upper part of the infiltration chamber 4 can be used as a sidewalk or a general site by backfilling the soil.

The infiltration chamber of the present invention is disposed around the water collecting tank and allows water to penetrate into the ground mainly from the side surface thereof, so that the permeation efficiency is better than the conventional permeation of only the bottom surface. The rainwater that has flowed into the water collecting tank 1 from the U-shaped groove U gradually flows out of the side opening 11 through the water passage duct 3 into the infiltration chamber 4, from where it penetrates into the surrounding ground and is absorbed. As a result, the inflow into the sewer is suppressed, and various problems such as urban flooding, heat island phenomenon, depletion of spring water, and land subsidence are eliminated by the infiltration of water into the ground. [Embodiment 2] FIG. 4 is a vertical sectional view of a rainwater outflow control facility according to a second embodiment of the present invention, FIG. 5 is a vertical sectional view taken along the line AA, and FIG. FIG. 4B
1 is a water collecting tank made of concrete or the like and embedded in the ground of a house or the like, 11 is a horizontally long side opening provided on a side wall thereof, and 3 is a side opening 11 thereof. Water passage duct, which is attached to
Is an orifice pipe with a check valve, which is also provided at a position lower than the side opening 11 on the side wall of the water collecting tank and gradually passes water, 12 is connected to a rain gutter of a house or the like and opened in the water collecting tank 1. An inflow pipe for flowing rainwater from the roof into the water collecting tank 1; a supply water pipe 13 for supplying clean water into the water collecting tank 1 as necessary;
Is a three-pole type water level sensor for detecting the water level in the water collecting tank 1, a water intake pipe 15 for pumping up water in the water collecting tank 1 for reuse, and 16 when the water collecting tank 1 is installed in the ground. Level mortar, F is the ground work such as split chestnut, crusher orchid, pile, etc. to be constructed underneath. 4 is the water drainage duct 3 and the orifice pipe 21 with check valve. The infiltration chamber, 41, is a crushed stone filled therein.

The size of the water collecting tank 1 may be determined from the roof area of a house or the like. For example, the planar shape is 3 m × 2 m, and the depth is 3 m × 2 m.
1.5 m, the side opening 2 has a height of 100 mm and a length of 1000 mm in a horizontally long shape.
It is provided horizontally at a position above mm. The infiltration room 4 has a height of 1200 mm and a depth of 800 m in three directions except one surface of the water collecting tank 1.
m, a side opening 2 provided with a water passage duct 3 is opened near the upper end of the permeation chamber 4, and an orifice pipe 21 with a check valve is opened at a lower position.

In this example, the site to be used is net 3240 × 38
It can be effectively used for lawns, flower beds, parking spaces, etc. on the ground by performing backfilling after installation at about 40 mm.
FIG. 7 is an explanatory diagram illustrating an operation method of the water collecting tank 1 of this embodiment. The water collecting tank 1 has three control water levels of WL1, WL2 and WL3. WL1 is at the lowest level, and if the water level falls below this level, water cannot be taken from the water intake pipe 15, so water must be supplied. Further, when the water level reaches the level WL2 at which the capacity for reuse is secured and water still enters the water collecting tank 1, the permeation chamber 4 is passed through the orifice pipe 21 with a check valve below. To be discharged.
The check valve is provided to prevent the water outside the tank from flowing back into the water collecting tank 1. On the other hand, WL3 is set as the discharge suppression level at the height of the maximum storage amount of the water collecting tank 1, and the side opening 11 is opened at this height. If the water level in the tank is less than WL2, the water in the water collecting tank 1 can be pumped up as appropriate and used as water for miscellaneous purposes such as watering, washing the car, and washing the toilet. If the water level in the tank becomes higher than WL3 due to heavy rain, water exceeding WL3
, Through the water passage duct 3 and into the infiltration chamber 4, and then gradually penetrates into the surrounding ground.

The method of determining the capacity of the infiltration chamber 4 is to comprehensively study the area, topography, geology, groundwater level, land use, land development plan, etc. of the area to be installed, and to be able to cope with the planned rainfall intensity. is necessary. Depending on the location conditions, the infiltration chamber 4 may be provided on one to four sides of the water collecting tank 1 and may be extended to the lower part of the water collecting tank 1 in some cases. The above is an embodiment in which the capacity of the water collecting tank 1 is not sufficiently increased and the infiltration chamber 4 is to be sufficiently provided. This is another embodiment in which the capacity of the memory is reduced.

Next, a modification of this embodiment will be described.
The collecting tank 1 shown in FIG.
Separately, arrange a water intake pipe 15 on one side to make a reuse zone 1a,
The other is the outflow suppression zone 1b. When the reuse zone 1 a becomes full due to rainfall, the water is drained through the overflow pipe 22 connected to the water flow duct 3 and enters the permeation chamber 4. Bacteria are proliferating in the upper part of the infiltration chamber 4 near the surface of the ground, so that rainwater can be purified using the purification power and permeated into the ground.

When the water from the water flow duct 3 becomes saturated, the water overflowing the reuse zone 1a enters the outflow suppression zone 1b, and penetrates into the ground through the infiltration chamber 4 from the bottom opening. FIG. 9 is an example in which the reuse zone 1a and the outflow suppression zone 1b are provided in the vertical direction, unlike the case of FIG. An orifice pipe 21 with a check valve is provided at a water level secured by the capacity of the reuse zone 1a, and when more water flows in, it is discharged from the orifice pipe 21 with a check valve to the permeation chamber 4. You. Further, when the water level rises without being able to cope with this discharge, the water is discharged from the water passage duct 3 into the permeation chamber 4.

Further, a partition plate 18 is provided in the reuse zone 1a to divide the inside into two parts in the horizontal direction, and an intake pipe 15 is arranged on one side to form an intake zone 1a '. Intake zone 1a 'contains a float
A hose 20 is provided which is always slightly above the surface of the water by 19, the end of which is in communication with the rest of the recycling zone 1a. This serves as a check valve, and when the water level in the intake zone 1a 'is lower than the rest, water flows into the intake zone 1a', but when the water level in the remaining portion is lower, the intake zone 1a '. Does not leak from Therefore the intake zone
The water in 1a 'is secured, and water can be replenished accurately.

FIG. 10 is a partial sectional view showing a connection portion of a makeup water pipe used in the second embodiment. 13 is a makeup water pipe, 131 is an electric valve operated by a water level sensor, 132 is a funnel for receiving water, 133 is a wire mesh, and 134 is a connecting pipe following the funnel. That is, the electric valve 131
The make-up water flowing into the water collecting tank 1 through the water is once released to the atmospheric pressure and received by the funnel, and flows into the water collecting tank 1 through the connection pipe 134. With such a configuration, even if there is any trouble, the water in the water collecting tank 1 never flows back to the makeup water pipe 13. Since the pressure of the makeup water pipe is not particularly reduced, water can be efficiently replenished as compared with the conventional natural flow using a low tank.

As described above, according to the present invention, even if there is a large amount of rainfall such as torrential downpour, the rainwater is not discharged to the sewer pipe, and no regulating pond is provided. Rainwater can be treated inside. Further, since the water collecting tank shown in the second embodiment is buried in the ground of a house or the like, the upper part thereof can be effectively used as a garden or a parking space.

[0020]

According to the present invention, rainwater penetrates into the ground to replenish the soil and at the same time suppresses inflow to the sewer system, or reduces the amount of water used by collecting and effectively utilizing groundwater. It has excellent effects such as being done.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a water collecting tank according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the vicinity of a water collecting tank according to the first embodiment of the present invention.

FIG. 3 is a vertical sectional view of a water collecting tank according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the water collecting tank taken along the line AA in FIG. 3 cut in a vertical direction.

FIG. 5 is a horizontal sectional view of the water collecting tank taken along the plane BB of FIG. 3;

FIG. 6 is a partial sectional perspective view showing the vicinity of a water flow duct attached to the water collecting tank of the present invention.

FIG. 7 is an explanatory diagram illustrating an operation method of a water collecting tank according to a second embodiment of the present invention.

FIG. 8 is a vertical sectional view of a water collecting tank according to another embodiment of the present invention.

FIG. 9 is a vertical sectional view of a water collecting tank according to still another embodiment of the present invention.

FIG. 10 is a partial cross-sectional view showing a makeup water pipe portion in the embodiment of the present invention.

[Explanation of symbols]

 1 Water collection tank 1a Reuse zone 1a 'Intake zone 1b Outflow suppression zone 3 Water flow duct 4 Infiltration chamber 11 Side opening 12 Inlet pipe 13 Makeup water pipe 14 Water level sensor 15 Intake pipe 16 Level mortar 17 Lid 18 (with check valve) Partition plate 19 Float 20 Hose 21 (With check valve) Orifice tube 22 Overflow tube 31 Front plate 32 Outer plate 33 Weir plate 41 Crushed stone 131 Electric valve 132 Funnel 133 Wire mesh 134 Connection tube 311 Opening 321 Water hole 331 Drain hole F Ground business P Pavement U U-shaped groove

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiro Kurume 1-38-1 Katsutadai, Yachiyo-shi, Chiba F-term in Enlight Corporation (reference) 2D063 AA14 DA04

Claims (3)

[Claims] A laterally elongated side opening (11) is provided on a side wall of a water collecting tank (1) buried in the ground that is connected to a water collecting groove of a road or the like and is not connected to the water collecting groove. Side opening (11)
And a crushed stone (41) is filled inside the ground around the water collecting tank (1) outside the water passage duct (3). A rainwater runoff control treatment facility, comprising a permeation chamber (4). 2. A water collecting tank (1) buried in the ground of a house or the like and having a horizontally long side opening (11) on a side wall, and an inflow opening into the water collecting tank connected to a rain gutter of a house or the like. Tube (12)
And a water level sensor (14) that detects the water level in the water collection tank, and an intake pipe (15) that pumps up water to reuse the water in the water collection tank
And a replenishing water pipe (13) for replenishing clean water into the water collecting tank according to the signal of the water level sensor, in a rainwater outflow suppression treatment facility, the side opening (11) provided on the side wall of the water collecting tank (1). A water duct (3) that allows water to gradually pass through is installed, and the side opening (11) on the side wall of the water collection tank (1)
An orifice pipe (21) with a check valve that allows water to gradually pass through is installed at a lower position, and crushed stone (41) is installed inside the ground around the water collecting tank (1) outside the water flow duct (3). )
A rainwater outflow treatment facility, characterized in that a permeation chamber (4) filled with water is disposed to open the water passage duct (3) and the orifice pipe (21) with a check valve. 3. A water passage duct (3) having an opening at a lower portion (311) in a shape closing a horizontally long opening (2) provided on a side wall of a water collecting tank.
A front plate (31) having an outer plate (32) projecting outward from the front plate (31), and a bottom connected to the bottom of the outer plate (32) and a top connected to the outer plate (32). A dam plate (33) disposed below the top plate and inside the outer plate (32);
2) A large number of small-diameter water holes (321) are provided at the bottom, and the distance between the outer plate (32) and the weir plate (33) is narrower on the weir plate bottom side than on the weir plate top side. The rainwater runoff control facility according to claim 1 or 2, wherein: