JP2003342999A - Water-duct-type rainwater infiltrating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-duct-type rainwater infiltrating apparatus which suppresses inflow of rainwater into sewage by infiltrating rainwater directly into the ground through side surfaces of a seepage pit to clarify the same. <P>SOLUTION: The water-duct-type rainwater infiltrating apparatus consists of a rainwater seepage pit main body 1 having side openings 2, and water ducts 3 which are attached to side surfaces to cover the openings 2, respectively. Each water duct 3 is formed of a front plate 31, a half external cylinder 32 connected to the front plate 31, and a half internal cylinder 33 having its bottom portion connected to the front plate 31 and having an upper end separated from the same to form an opening. Further, the front plate 31 has water-flowing holes 311 near the bottom thereof, and the external cylinder 32 has water- flowing holes 321 near the bottom thereof. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater infiltration device for suppressing outflow to the sewer by infiltrating underground rainwater collected in a gutter of a road, a parking lot, a rain gutter of a house or the like.

[0002]

2. Description of the Related Art In order to prevent temporary large-scale outflow of rainwater into sewers, it is obligatory by law to establish a regulated pond with a certain capacity and discharge it into the sewers when constructing residential land of a certain size or larger. ing. However, it is not preferable from the viewpoint of effective use of the land that a certain area must be applied to the regulating pond even if the residential land is constructed, and the sales area for the developer also decreases, and even after the installation, residents, especially infants However, there are problems such as the danger of accidents for children. In addition, as urbanization progresses, the city is covered with structures and asphalt, and rain flows directly from the rainwater main to the river, which significantly reduces the water retention capacity of the soil, changes the natural cycle and concentrates due to climate change. The heavy rains and the tendency of light rain became remarkable, and the urban flood and heat island phenomenon,
It is also pointed out that it is the cause of depletion of spring water and subsidence.

[0003] There are also movements for private parking lots and the like to regulate the discharge of rainwater on the premises to public sewers.

[0004]

In order to deal with these problems, a rainwater infiltration basin is provided downstream of a gutter of a road or a rain gutter of a house, and rainwater is infiltrated underground from the rainwater infiltration basin to the sewer. Some parts of the water are used to control the outflow of water, but the conventional infiltration basin has a structure that allows it to infiltrate into the ground from its bottom. Therefore, there is a problem that oil content spilled on the road pollutes the ground and the permeation capacity decreases due to clogging, and the permeation speed is slower than the permeation from the side.

It is an object of the present invention to improve this point and to remove harmful components such as earth and sand and oil so that only water permeates into the underground, thereby realizing underground permeation accompanied by water purification.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a water-passing duct type which comprises a rainwater-infiltrating basin body having a laterally long side opening on a side wall and a water-passing duct attached to the side wall so as to close the side opening. In the rainwater infiltration device, the water passage duct has a front plate that closes the side opening, an outer plate that also closes the side opening, and a top located in the middle between the front plate and the outer plate. A partition duct lower than these, which is a water duct type rainwater infiltration device characterized in that water holes are provided near the bottom of the front plate and near the bottom of the outer plate, preferably the outer plate. Is joined to the front plate from above and below, and is a half-divided cylindrical body having a horizontal axis.
The water-passing type rainwater infiltration device is a half-divided cylindrical body in which the partition member has an axis substantially in common with the partition member, is joined to the front plate at the bottom, and has a top opening.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a rainwater infiltration basin body having laterally long side openings on a side wall, and a water passage duct type rainwater infiltration system comprising a water passage duct attached to the side wall so as to close the side opening. In the device, the water duct is a front plate having a shape that closes the side opening, an outer plate that also has a shape that closes the side opening, and the top is located between these front plates and the outer plate. It is characterized in that it comprises a low partition member, and water passage holes are provided in the vicinity of the bottom portion of the front plate and in the vicinity of the bottom portion of the outer plate, respectively. In other words, this water duct is a kind of siphon, and the water in the seepage pit enters the inside of the partition member and overflows when the water level exceeds the top of the partition member. Since it is at the bottom, the oil contained in the inflowing rainwater remains on the infiltration side, and the longitudinal water flow inside the partition member becomes slower than the flow velocity of water flowing into the infiltration side, so that the amount of sediment Foreign matter settles, and only water is discharged from the water duct into the ground.

[0008]

[Embodiment 1] FIG. 1 is a perspective view showing a rainwater permeation apparatus of a water duct according to a first embodiment of the present invention, in which 1 is a rainwater permeation basin body made of concrete or the like, and 2 is a rainwater permeation basin. A horizontally long side opening 3 provided on the side surface of the main body 1 is a side opening 2 thereof.
It is a water duct that is attached to the water tank and that allows water to flow in and out between the rainwater infiltration basin body 1 and the surrounding ground. The plan shape of the rainwater infiltration basin body 1 is, for example, 800 mm × 800 mm on the outside and 600 mm in height.
As the side opening 2, a horizontally long one having a height of 140 mm and a length of 400 mm is horizontally provided at a position near the upper end of the rainwater infiltration basin body 1 at the center of the four surfaces. The wall thickness is, for example, 150 mm.

The water duct type rainwater infiltration device of the present invention removes earth and sand and oil from rainwater collected in a gutter of a road, a parking lot, a rain gutter of a house, etc., and infiltrates it into the sewer. The purpose is to suppress. FIG. 2 is a partial cross-sectional perspective view showing the vicinity of the water passage 3 of the water passage type rainwater infiltration device buried in the ground according to the first embodiment of the present invention. The water duct 3 has a shape in which a double cylinder is placed horizontally and is halved vertically at the central axis. A front plate 31 is attached to the split surface, and a horizontally long water passage hole 311 is arranged in the front plate 31 over the entire length. Has been done. A large number of small-diameter water passage holes 321 through which water passes are also provided near the bottom of the outer cylinder 32 having a half-split cylindrical shape.
The inner cylinder 33, which is also a half-split cylinder, is inserted inside the outer cylinder 32, and the bottom of the inner cylinder 33 is joined to the front plate 31.
The top does not reach the front plate 31 and forms an opening 331.

The water duct 3 is made by welding a plate material such as a resin plate or a stainless steel plate, and the outer tube 32 has a radius of 55 m, for example.
The inner cylinder 33 has a radius of 35 mm. Water holes 311 on front plate 31
It is preferable to increase the total area of the latter (321) on the outer side (ground side) between the water passage hole 321 of the outer cylinder 32 and the water passage 321. When the water level in the rainwater infiltration basin 1 rises and enters the inside of the inner cylinder 33 through the water passage hole 311 and exceeds the top of the inner cylinder 33, water overflows from the opening 331 and the inner cylinder 33 and the outer cylinder 32 are separated from each other. It flows down into the gap, is discharged from the bottom water passage 321 and permeates into the ground.

Since the water passage hole 311 is located lower than the opening 331, the oil contained in the rainwater that has flowed into the rainwater infiltration basin 1 becomes an oil film and remains in the rainwater infiltration basin 1 and inside the inner cylinder 33. Not discharged. Further, since it slowly rises in the inner cylinder 33 and then flows down into the gap between the inner cylinder 33 and the outer cylinder 32, sand or the like in the rainwater sinks and remains in the inner cylinder 33, and is not discharged from the inner cylinder 33. That is, the water duct 3 has a function of separating oil and soil in rainwater and allowing only water to permeate into the surrounding ground. [Embodiment 2] FIG. 3 is a partial cross-sectional view showing the vicinity of a water duct 3 of a rain duct infiltration apparatus of water duct according to a second embodiment of the present invention which is buried in the ground. The difference from the first embodiment is that the mounting direction of the water passage duct 3 is reversed, and the water in the rainwater permeation pit enters the outer cylinder 32 through the water passage hole 321 as shown by the arrow. , It overflows from the opening 331 and is discharged into the ground through the water passage hole 311. Even if the orientation is reversed, the function of separating oil and sand is basically the same, but experiments have shown that this orientation may yield better results. Further, depending on the thickness of the concrete wall of the rainwater-infiltrating basin body 1, the water collecting duct 3 may protrude outward as shown in FIG. 2 in the first embodiment, which may interfere with the construction. There is no fear.

A water passage hole 31 for the volume of the rainwater infiltration basin body 1
Since the total area of each of 1 and the water passage 321 is related to the flow velocity in the water passage, it is necessary to determine them in consideration of them. FIG. 4 is an explanatory view for explaining the installation procedure of the water duct type rainwater infiltration device of the embodiment of the present invention. First (a)
As shown in (b), the ground at the installation site is excavated, and as shown in (b), crushed stone B is laid on the bottom. Then, as shown in (c), the rainwater infiltration basin 1 is installed on the crushed stone B. If the installation depth is deep, a frame-shaped auxiliary basin 1a without a bottom is placed on the top of the basin, and a lid is placed at the surface level. Or cover with grating. An inlet for rainwater from the surroundings is provided in the auxiliary cell 1a. Finally, as shown in (d), the crushed stone B is backfilled around the rainwater infiltration pit 1 and paved to complete the process.

In order to expect a purification action by bacteria in the soil, the position of the water passage on the discharge side should be 500 to 600 m from the ground surface.
The depth is preferably m.

[0014]

According to the present invention, the load of sewage treatment is reduced by infiltrating rainwater collected on roads, parking lots, residential premises, etc. into the ground, and rainwater is infiltrated underground with water purification. By doing so, it has an excellent effect that the quality of groundwater can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a rainwater infiltration box according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view showing the vicinity of the water duct of the rainwater infiltration basin of the first embodiment of the present invention which is buried in the ground.

FIG. 3 is a partial cross-sectional view showing the vicinity of a water passage duct of a rainwater seepage pit according to a second embodiment of the present invention buried in the ground.

FIG. 4 is an explanatory diagram illustrating a procedure for installing a rainwater infiltration basin according to an embodiment of the present invention.

[Explanation of symbols]

1 Rainwater penetration box (main body) 1a Auxiliary Masu 2 side opening 3 water duct 31 Front plate 32 Outer cylinder (outer plate) 33 Inner cylinder (partitioning member) 311 and 321 water holes B crushed stone

Claims (3)

[Claims] 1. A rainwater infiltration basin body (1) having a laterally long side opening (2) on a side wall, and a box-shaped water passage duct (3) attached to the side wall so as to cover the side opening (2).
And a water duct (3) in which the water duct (3) has a front plate (31) shaped to close the side opening (2) and a front plate (31) shaped to close the side opening (2). An outer plate (32) and a partition member (33) located between the front plate (31) and the outer plate (32) and having a top lower than these, and near the bottom of the front plate (31). A water duct type rainwater infiltration device, characterized in that water holes (311, 321) are provided near the bottom of the outer plate (32). 2. The outer plate (32) is arranged above and below the front plate (31).
Is a half-divided cylindrical body with the axis in the horizontal direction, the partition member (33) has the axis substantially in common with the partition member (33), is joined to the front plate (31) at the bottom, and the top is open. The water passage duct type rainwater infiltration device according to claim 1, which is a half-divided cylinder. 3. The water duct type rainwater infiltration device according to claim 2, wherein the water duct (3) is attached with the front plate (31) facing the outer surface of the side wall.