JP2001336213A - Rainwater separating basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent environmental pollution and to restrain the load of a sewage treatment plant. SOLUTION: Initial rainwater of a rainfall is discharged from a first outlet 22 through a first passage 26. During this time, in a valve 32, water-expansive rubber 44 expands by absorbing the rainwater flowing in the first passage 26, and soon blocks up the first passage 26. Then, the rainwater thereafter is discharged from a second outlet 24 through a second passage 28. Thus, when connecting a sewage discharge pipe 48 for constituting a sewage pipeline reaching the sewage treatment plant to the first outlet 22 and connecting a rainwater discharge pipe 50 for constituting a sewage pipeline reaching rivers to a second outlet 24, the initial rainwater (including a pollutant) of the rainfall is allowed to flow into the sewage treatment plant, and the rainwater thereafter (including no pollutant) can be discharged to the rivers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater separation basin, and more particularly to a rainwater basin for connecting a rainwater introduction pipe and two drainage pipes. The present invention relates to a rainwater separation basin for discharging rainwater from the other drain pipe.

[0002]

2. Description of the Related Art Referring to FIG. 21, in a conventional rainwater basin 1 of this kind, an inlet 3 and an outlet 4 are formed on a side wall of a basin body 2, a rainwater introduction pipe 5 is connected to the inlet 3, and an outlet 4 is provided. To the drain pipe 6.

When the rainwater basin 1 is applied to a sewage sewer system in which rainwater and sewage flow separately, all of the rainwater is discharged into the river or penetrated into the ground through a drain pipe 6 and a rainwater pipeline. When applied to a combined sewer system in which rainwater and sewage flow together, all of the rainwater was provided to the sewage treatment plant through the drain pipe 6 and the common pipe.

[0004]

Conventionally, all of the rainwater is discharged into the river or infiltrated into the ground, or given to the sewage treatment plant. In the former case, the pollution adhering to the road surface or the ground surface is reduced. Substances (heavy metals such as factory emissions, exhaust gas, automobile brake powder, etc.) are mixed into rainwater during the early stages of rainfall, which pollutes the natural environment. There was a problem that the burden would be excessive.

[0005] Therefore, a main object of the present invention is to provide a rainwater separation basin capable of simultaneously solving the problem of environmental pollution and the problem in a sewage treatment plant.

[0006]

SUMMARY OF THE INVENTION The present invention provides a basin body, an inlet for introducing rainwater into the basin body, first and second outlets for discharging rainwater from the basin body, and a first outlet from the inlet to the first outlet in the basin body. A rainwater separation basin comprising one flow path, a second flow path from an inlet to a second outlet in the basin body, and valve means for opening and closing the first flow path operated by expansion and contraction of a water expansion member.

[0007]

A rainwater inlet pipe for taking in rainwater is connected to the inlet of the rainwater separating basin, and a drain pipe is connected to the first and second outlets. When it rains, the rainwater taken into the rainwater introduction pipe is supplied to the inside of the basin from the inlet, and is discharged from the first outlet or the second outlet through the first channel or the second channel. For example, when the first outlet is formed below the second outlet and the valve means is arranged in the first flow path, the water expansion member constituting the valve means expands by absorbing rainwater flowing through the first flow path,
The first flow path is closed. Therefore, the subsequent rainwater
It flows through the flow path and is discharged from the second outlet. In other words, the rainwater in the early rainfall is discharged from the first channel, and the subsequent rainwater is
It is discharged from the second flow path. Therefore, when the drain pipe at the first outlet is connected to the sewer pipe leading to the sewage treatment plant, and the drain pipe at the second outlet is connected to the sewer pipe leading to the river, rainwater (including pollutants) in the early stage of rainfall. To the sewage treatment plant, and the subsequent rainwater (containing no pollutants) can be discharged to rivers.

[0008]

According to the present invention, environmental pollution can be prevented and the processing load on the sewage treatment plant can be reduced.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rainwater separation tub 10 of this embodiment shown in FIG.
This is for discriminating rainwater in the early stage of rainfall and rainwater thereafter and discharging them from different outlets, and is integrally formed by injection molding of a synthetic resin (such as vinyl chloride).

The rainwater separation tub 10 is a cylindrical tub body 1 having a bottom.
4, a mud reservoir 16 is formed in the lower part of the basin body 14, and a receiving port 18 is formed in the upper opening. In addition, an inlet 20, a first outlet 22, and a second outlet 24 are formed on the side wall of the box body 14, respectively, as receiving ports. Entrance 20
Is an opening for introducing rainwater into the basin body 14, and is formed at a position higher than the first outlet 22 and the second outlet 24. The first outlet 22 is an opening for discharging rainwater at the beginning of rainfall, and is formed at a position lower than the second outlet 24.

Accordingly, a first flow path 26 extending from the inlet 20 to the first outlet and a second flow path 28 extending from the inlet 20 to the second outlet 24 are formed inside the box body 14.

[0013] A mud retaining member 30 such as a bucket is disposed at the bottom (mud retaining portion 16) inside the basin main body 14, thereby accumulating and removing mud and the like contained in the inflowing rainwater. it can. In addition, the first flow path 2
6, the disk-shaped valve 32 is detachably arranged so as to block an upper region including the inlet 20 and the second outlet 24 and a lower region including the first outlet 22. You.

As shown in FIG. 2, the valve 32 has a lower plate 34 having an outer diameter slightly smaller than the inner diameter of the box body 14.
And an upper plate 36, and the lower plate 34 and the upper plate 36 are arranged in parallel with each other via a spacer 38. The upper plate 36 has a plurality of water holes 40 formed therein, and the lower plate 34 has a plurality of water holes 42 formed therein. At a position corresponding to the water hole 40 on the upper surface of the lower plate 34, a disk-shaped water-swelling rubber 44 having a reduced upper outer diameter is fixed as a water-swelling member.

The water-swellable rubber 44 is made of SBR (styrene butadiene rubber), CR (chloroprene rubber), NBR (acrylonitrile butadiene rubber), CSM (chlorosulfonated polyethylene), EPT (ethylene propylene tapapolymer), NR (natural rubber). Or a composite material of a rubber such as IIR (isobutylene-isoprene rubber) and a highly water-absorbing polymer.
About 8 times) and shrinks when dried to return to its original size. The size and shape of the water-swelling rubber 44 are set so that the water passage hole 40 can be opened at the time of drying and the water passage hole 40 can be closed at the time of expansion.

When a drainage pipe is constructed using the rainwater separation tub 10, a rainwater inlet pipe 46 is connected to the inlet 20 and a drainage pipe 48 for sewage is connected to the first outlet 22 underground.
A rainwater drain pipe 50 is connected to the second outlet 24. The lower end of a rising pipe extending from the ground surface is connected to the receiving port 18. The drainage pipe for sewage 48 constitutes a pipeline extending from a sewage treatment plant (not shown), and the drainage pipe 50 for rainwater constitutes a pipeline extending from a river (not shown).

When rain falls after construction, rainwater that has permeated into the ground or rainwater from a gutter is taken into the basin body 14 through the rainwater introduction pipe 46 and the inlet 20. At the early stage of the rainfall, the water expansion rubber 44 is dry, so that the water hole 40 of the valve 32 is open. Therefore, as shown by the arrow in FIG.
Through the first outlet 22, and further supplied to a sewage treatment plant through a wastewater drainage pipe 48 or the like. At this time, in the valve 32, the rainwater that has passed through the water hole 40 flows over the surface of the water expansion rubber 44, so that the water expansion rubber 44 absorbs the rainwater and expands with the passage of time, and eventually the water hole 40 is closed. Block. In addition, mud and the like contained in the rainwater are accumulated in the mud retaining member 30 while flowing through the bottom of the basin body 14.

When the water passage hole 40 is closed, the rainwater flows as shown in FIG.
As shown by the arrow in (B), the gas is discharged from the second outlet 24 through the second flow path 28 formed above the valve 32,
Further, the water is discharged into the river or permeated into the ground through the drainage pipe 50 for rainwater.

The amount and time of the outflow of the initial rainwater can be adjusted by changing the size and number of the water holes 40 and the water holes 42, the expansion rate of the water expansion rubber 44, and the like.

Thereafter, when the rain stops and the water-swelling rubber 44 dries, its volume shrinks and returns to its original shape. Therefore, also in the case of re-rainfall, the initial rainwater flows out of the first outlet 22 and the subsequent rainwater flows out of the second outlet 24 in the same manner.

According to this embodiment, it is possible to supply rainwater in the early stage of rainfall to the sewage treatment plant and discharge the subsequent rainwater to a river. Therefore, environmental pollution can be prevented and the processing load on the sewage treatment plant can be reduced.

Further, since the first flow path 26 is opened and closed by expansion and contraction of the water expansion rubber 44, the maintainability is far superior to that of, for example, providing valve means using an electric power source. .

Further, since the valve 32 can be attached and detached, cleaning and inspection can be easily performed.

In the above-described embodiment, the first outlet 22 and the second outlet 24 are formed in parallel, but the formation positions thereof can be changed as appropriate. For example, as shown in FIG. It may be formed to be orthogonal. In addition, entrance 20,
The first outlet 22 and the second outlet 24 may be formed as a spigot.

Further, as shown in FIG. 5, for example, a mud member 52 may be arranged immediately below the entrance 20 in the box body 14. In this case, since rainwater from which mud and the like have been removed flows through the valve 32, clogging of the valve 32 can be prevented. Therefore, maintenance becomes easier. When the mud reservoir 16 is not formed, the inner surface of the bottom of the basin body 14 may be inclined toward the first outlet 22 to make it easier for rainwater to flow out.

In the above embodiment, the first expansion and contraction of the water expansion rubber 44 disposed below the water passage hole 40 causes the first expansion.
Although the flow path 26 is opened and closed, for example, as shown in FIG. 6, the first flow path 26 may be opened and closed by expansion and contraction of a water expansion rubber 56 arranged in the water passage hole 54. .
Also in this case, the rainwater at the beginning of rainfall is discharged through the first flow path 26 as shown by the arrow in FIG. 7A, and after the water passage hole 54 is closed by the expansion of the water expansion rubber 56, 7B, and is discharged through the second flow path 28.

Further, for example, as shown in FIG. 8, a water expanding rubber 58 may be arranged at the first outlet 22.
Also in this case, the rainwater at the beginning of rainfall is discharged through the first flow path 26 as shown in FIG.
After the first outlet 22 is closed by the expansion of
As shown in (B), the gas is discharged through the second flow path 28.

In the above-described embodiment, the first flow path 26 is opened and closed by the water-expandable rubber itself. However, as described below, the first flow path 26 is displaced as the water-expandable rubber expands and contracts. The first flow path 26 may be opened and closed by a valve body.

The valve 32a shown in FIG. 9 is such that when the water expanding rubber 60 expands, the valve body 62 is displaced downward to open the first flow path 26. In this valve 32a, the water-swelling rubber 6
0 is supported, and the valve body 62 is connected to the lower end of the water expansion rubber 60. A ring-shaped sealing material 68 is provided on the upper surface of the valve body 62, and this sealing material 68 is in contact with the lower surface of the plate 36a.

In the rainwater separation tub 10 using the valve 32a, rainwater at the beginning of rainfall is discharged through the second flow path 28 on the valve 32a, as indicated by the arrow in FIG. When the water-expandable rubber 60 expands by absorbing rainwater that has entered the water passage hole 64 from the opening 66a provided in the support member 66, the valve body 62 descends and the water passage hole 6 extends.
4 is released. Therefore, the subsequent rainwater is shown in FIG.
As shown by the arrow in (B), it is discharged through the first flow path 26. However, in this embodiment, the drainage pipe 48 for sewage is connected to the second outlet 24 of the second flow path 28, and the first flow path 2
The rainwater drainage pipe 50 is connected to the first outlet 22 of No. 6.

The valve 32b shown in FIG.
When the valve expands, the valve element 72 is displaced and the first flow path 26
Is to be blocked. In this valve 32b, a valve body 72 that opens and closes a water passage hole 74 is provided via a hinge 76, and a water expansion rubber 70 provided on the bottom of the cell body 14 is fixed to the lower surface of the valve body 72, The valve body 72 is displaced by the expansion and contraction of the water expansion rubber 70.

In the rainwater separation tub 10 using the valve 32b, rainwater at the beginning of rainfall is discharged through the first flow path 26 as shown in FIG. When the water-swelling rubber 70 expands by absorbing rainwater, the valve body 72 is lifted, and the water passage hole 74 is closed. Therefore, the subsequent rainwater is discharged through the second flow path 28 as shown by the arrow in FIG.

For example, as shown in FIG.
A second valve body 80 interlocked with the valve body 78 is further provided. When the first valve body 78 opens the first flow path 26 due to the expansion of the water expansion rubber 84, the second valve body 80 opens the second flow path. The road 28 may be closed. In this embodiment, the first outlet 22 and the second outlet 24 are formed at substantially the same height, and the first valve body 78 and the second valve body 80 are joined at a predetermined angle via the hinge 82. Under the one main surface of the first valve body 78, a water-swelling rubber 84 provided on the inner surface of the box body 14 is fixed. Around the first outlet 22 and the second outlet 24, ring-shaped seal members 86 and 88 are arranged.

In this embodiment, the rainwater in the early stage of rainfall is
As shown in FIG. 3A, the air is discharged through the second flow path 28. When the water-swelling rubber 84 expands by absorbing rainwater, the first valve body 78 is rotated to open the first flow path 26 and the second valve body 80 is rotated to rotate Channel 2
8 is closed by the second valve body 80. Therefore, the subsequent rainwater is discharged through the first flow path 26 as shown in FIG. However, in this embodiment, the second outlet 24
The drainage pipe 48 for sewage is connected to the first outlet 22, and the drainage pipe 50 for rainwater is connected to the first outlet 22.

Further, in each of the above-described embodiments, the case where the water-swelling rubber is used as the water-swelling member has been described. For example, a material having excellent water absorption and swelling properties and a material exhibiting elastic expansion / shrinkage properties, shape maintaining properties, etc. when combined with the material (sponge, etc.)
May be used as the water expanding member. Further, for example, a device in which a material having water-swelling properties and shrinkage properties (such as a highly water-absorbing polymer) and a piston as shown in FIG. 15 may be used as the water-swelling member. In this case, the restoring force of an elastic member such as a spring or rubber can be used for the restoration.

The device 94 shown in FIG. 15 includes a cylindrical case 96, and a plurality of holes 96a are formed in the peripheral wall of the case 96. A superabsorbent polymer 90 and a piston 98 are arranged inside the case 96 and the piston 9
The tip of 8 protrudes from case 96. At the tip of the piston 98, a plate-like member 100 is provided.
And the case 96 are connected by a spring 92.

Therefore, the superabsorbent polymer 90 has the pores 96
When the water that has invaded from a is absorbed and expanded, the piston 98
Is pushed out of the case 96 (FIG. 16), and when the superabsorbent polymer 90 dries and contracts, the restoring force of the spring 92 returns the piston 98 to its original position (FIG. 15).

As shown in FIGS. 17 to 20, this apparatus 94 can be applied to the above-described embodiments shown in FIGS. 1, 9, 11, and 13.

When applied to the embodiment of FIG. 1, a cylindrical support member 102 is provided below a water passage hole 42 formed in the lower plate 34, as shown in FIG. The device 94 is arranged. At the bottom of the support member 102, a plurality of water holes 102a are formed so that the initial rainwater can be discharged while being stored in the support member 102. And the device 94
On the upper surface of the plate-shaped member 100, a sealing material 104 for closing the water passage hole 40 of the upper plate 36 when the device 94 (the superabsorbent polymer 90) expands is provided.

In the case of application to the embodiment shown in FIG. 9, as shown in FIG.
The valve body 62 is attached to the plate-shaped member 100.

When applied to the embodiment of FIG. 11, FIG.
As shown in FIG.
The plate-shaped member 100 and the valve body 72 are connected via the connecting member 106 so that the valve member 72 can be displaced.

When applied to the embodiment of FIG. 13, FIG.
As shown in the figure, the device 94 is disposed on the bottom surface inside the box body 14, and the plate-shaped member 100 and the second valve body 80 are connected to the connecting member 108.
Connected via

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a valve;

FIG. 3 is an illustrative view showing an operation of the valve of the embodiment in FIG. 1;

FIG. 4 is an illustrative view showing a modified example of the embodiment in FIG. 1;

FIG. 5 is an illustrative view showing a modified example of the embodiment in FIG. 1;

FIG. 6 is an illustrative view showing a modified example of the valve;

FIG. 7 is an illustrative view showing an operation of the valve of the embodiment in FIG. 6;

FIG. 8 is an illustrative view showing a modified example of a valve and an operation thereof;

FIG. 9 is an illustrative view showing a modified example of the valve;

FIG. 10 is an illustrative view showing an operation of the valve of the embodiment in FIG. 9;

FIG. 11 is an illustrative view showing a modified example of the valve;

FIG. 12 is an illustrative view showing an operation of the valve of the embodiment in FIG. 11;

FIG. 13 is an illustrative view showing a modified example of the valve;

FIG. 14 is an illustrative view showing an operation of the valve of the embodiment in FIG. 13;

FIG. 15 is an illustrative view showing a modified example (apparatus) of the water expanding member;

FIG. 16 is an illustrative view showing a state where the water expanding member of FIG. 15 is expanded;

FIG. 17 is an illustrative view showing a modified example of the valve to which the water expansion member of the embodiment in FIG. 15 is applied;

FIG. 18 is an illustrative view showing a modified example of the valve to which the water expansion member of FIG. 15 is applied;

FIG. 19 is an illustrative view showing a modified example of the valve to which the water expansion member of the embodiment in FIG. 15 is applied;

20 is an illustrative view showing a modified example of the valve to which the water expansion member of the embodiment shown in FIG. 15 is applied;

FIG. 21 is an illustrative view showing a conventional technique;

[Explanation of symbols]

 10 ... rainwater separation basin 14 ... basin body 20 ... inlet 22 ... first outlet 24 ... second outlet 32, 32a, 32b ... valve 44, 56, 58, 60, 70, 84 ... water expansion rubber 62, 72 ... valve body 78 first valve body 80 second valve body 94 device

Claims (6)

[Claims] A main body, an inlet for introducing rainwater into the main body, first and second outlets for discharging the rainwater from the main body, a first flow from the inlet to the first outlet in the main body. A rainwater separation basin, comprising: a path, a second flow path from the inlet to the second outlet in the basin body, and valve means operated by expansion and contraction of a water expansion member to open and close the first flow path. 2. The rainwater separating basin according to claim 1, wherein said water expanding member is a water expanding rubber. 3. The valve means includes a water expansion member disposed in the first flow path, and when the water expansion member expands, the first flow path is closed by the water expansion member. The rainwater separation basin according to 1 or 2. 4. The valve means includes a first valve body that opens and closes the first flow path and a water expansion member fixed to the first valve body. 3. The rainwater separation basin according to claim 1, wherein one valve body is displaced to open or close the first flow path. 5. The valve means includes a second valve body interlocked with the first valve body, and when the first valve body opens the first flow path, the second valve body is connected to the second valve body. The rainwater separation basin according to claim 4, wherein the flow passage is closed. 6. The method according to claim 1, wherein the first outlet is provided below the second outlet, and the rainwater is discharged from the second outlet when the first flow path is closed. Rainwater separation basin according to any of the above.