JP2008156974A - Rainwater treating structure and rainwater treating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater treating structure and a rainwater treating method, capable of preventing pollution of underground water by initial waste water, and capable of preventing reduction in permeation capacity of a permeation basin, by directly making the waste water in the initial stage of a rainfall flow in a catchment basin without making the waste water flow in the permeation basin, by adjacently arranging the permeation basin and the catchment basin. <P>SOLUTION: This rainwater treating structure is characterized in that: the permeation basin 5 for introducing and permeating rainwater under the ground, is made adjacent to the upstream side of an existing or new catchment basin 1 arranged on the road side; the permeation basin 5 is provided with an outflow port 6 for transferring water to the adjacent catchment basin 1 when there is inflow water of predetermined capacity or more; an L-shaped gutter block 9 composed of a curbstone part 7 being a vertical piece part and an apron part 8 being a horizontal piece part, is arranged as a cover material for covering its opening upper part; an upper surface of the apron part 8 is inclined downward in the curbstone part direction; the apron part 8 is provided with a water introducing part 10 for making the rainwater flow inside the permeation basin 1; and an impervious part 11 for blocking up a part of the water introducing part 10, is arranged in a corner part between the apron part 8 and the curbstone part 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, an infiltration dredge and a catchment basin are arranged adjacent to each other, and sewage in the initial stage of rainfall can be directly introduced into the catchment basin without flowing into the seepage basin, preventing contamination of groundwater by the initial sewage, The present invention relates to a rainwater treatment structure and a rainwater treatment method capable of preventing a decrease in permeation capacity.

  Conventionally, a side ditch for flowing rainwater is provided in the basement beside the road, and a street block is installed to block the upper opening of the side ditch. In ordinary street blocks, there are cases where a small water introduction hole for guiding rainwater into the ditches is provided, or there is a case where it is not provided at all, but water collection with large water intakes such as gratings at intervals of several tens of meters. A rainwater treatment system is generally adopted in which dredging is arranged and rainwater collected in this catchment is sent to a water treatment facility through a drainage channel (pipe) for treatment and storage.

  A rainwater treatment system that stores rainwater and gradually permeates it into the soil is also known. This system uses a seepage trough formed from a water permeable block made of porous concrete or the like having a water permeable function.

  In particular, osmosis dredging can contribute to the reduction of the amount of drainage of the waterworks by permeating or storing rainwater underground, and also contributes greatly to environmental conservation.

However, in the case of only the catchment basin, unexpected inflow water is generated in the case of heavy rain due to abnormal weather in recent years, etc., resulting in, for example, clogging of drainage channels, resulting in flooding due to flooding of main roads or rivers. Etc. may occur.
In addition, the penetrating dredging alone is unlikely to cause a problem in a case where a small amount of rainwater collected from a predetermined area such as a home garden or facility is treated, but a normal trunk line in which a large amount of rainwater is expected to flow. On roads and the like, a large amount of rainwater and a large amount of garbage and soil flow in, so the storage period is shortened, the groundwater is contaminated by the initial sewage, and the water permeability function is reduced in a short time.
Therefore, the present invention can solve the above-mentioned problems, and can efficiently prevent the contamination of groundwater by the initial sewage and prevent the deterioration of the osmosis permeation capacity by efficiently combining the water collecting tank and the seepage tank. The purpose is to propose a processing system.

The present invention has been proposed in view of the above, and an osmosis basin that introduces rainwater and infiltrates it underground is adjacent to the upper side of an existing or newly installed basin disposed on the side of the road. Is provided with an outlet to transfer water to the adjacent catchment when there is more than a certain volume of inflow water, and the apron that is the curbstone part and the horizontal piece part as the cover material covering the upper part of the opening The apron part has an upper surface that slopes down toward the curb, and the apron is provided with a water-conveying part that allows rainwater to flow into the apron and the corners of the apron and curb The present invention relates to a rainwater treatment structure characterized in that a water shielding part for closing a part of the water guiding part is provided.
The above-mentioned “water-side” refers to a direction with a high slope in the road length direction.

  The present invention is also a rainwater treatment method using the rainwater treatment structure, wherein the rainwater is led to an L-shaped street block on the seepage trough, and rainwater exceeding a certain flow rate is caused to flow into the seepage trough from the water guide portion. A rainwater treatment method is also characterized in that rainwater that does not exceed a certain flow rate is allowed to pass through a water-impervious section and flow into a catchment, and inflow water that exceeds a predetermined capacity of the seepage trough is transferred from the outlet to the catchment. It is what we propose.

According to the rainwater treatment structure and rainwater treatment method of the present invention, when the flow rate of rainwater is small, the rainwater flows into the apron part and the corner of the curb part in a narrow width due to the slope, and therefore flows in from the water guide part. Without passing through the impermeable part, it flows into the catchment. That is, the sewage at the initial stage of rainfall does not flow into the seepage trough but can flow directly into the catchment trough. On the other hand, when the flow rate of rainwater is large, the rainwater flows in a wide width exceeding the water shielding portion, and therefore flows into the seepage trough and the catchment trough.
Therefore, when the rainfall is low, the rainwater flow rate is also low, and there is no particular problem even if it flows into the catchment as mentioned above. During the heavy rainfall such as typhoon, the rainwater flow rate is low. However, as mentioned above, it flows into the seepage basin and the catchment basin, so it can handle a larger amount of inflow water compared to the case of the catchment basin alone. Flooding due to flooding of rivers or increased water volume in rivers can be prevented. Further, since the initial sewage does not flow into the seepage basin, the groundwater is not polluted and the osmosis capacity of the seepage basin is not reduced.

The rainwater treatment structure of the present invention can be applied to a case where an existing catchment basin is disposed on the side of the road, and can also be applied to a case where, for example, the road itself is newly laid, An infiltration basin is disposed adjacent to the upper side of an existing or new water collection basin disposed on the side of the road.
As described above, the above water side means a direction with a high slope in the length direction of the road, and a direction with a low slope is called a water side.

  The catchment basin in the present invention is to store a part of rainwater by flowing rainwater into it, and send most of the rainwater to a water treatment facility for treatment and storage. When an existing catchment is used, it can be applied as it is without any modification. When a catchment is newly installed, it can be constructed in the same way as the existing catchment, and its structure is not particularly limited. . In addition, as a cover material covering the upper part of the opening of the catchment, a street block provided with a water inlet for introducing rainwater is used, but the structure is not particularly limited, and any But it can be applied.

The infiltration basin in the present invention introduces rainwater and infiltrates it underground, and there is an outflow port for transferring water to an adjacent water collection basin when there is inflow water of a predetermined capacity or more. Is provided.
This osmosis basin is formed of a product with a water permeable function, such as porous concrete having a water permeable function, a perforated fume tube (vinyl chloride slag), etc., all of which is permeable to water. For example, the lower part may be formed of a product having a water permeability function and the upper part may be formed of a product having no water permeability function.

  As described above, the outlet is for transferring inflowing water of a predetermined volume or more to an adjacent catchment, for example, overflowing inflowing water exceeding a predetermined storage capacity and transferring it to the catchment. I just need it.

An L-shaped street block made up of a curbstone portion that is a vertical piece portion and an apron portion that is a horizontal piece portion is disposed as a cover material that covers the upper opening of the seepage ridge. This L-shaped street block may be made of ordinary concrete, with a curb portion on the side of the road and an apron portion on the road side, and its upper surface is flush with the road surface. It is arranged.
The top surface of the apron part is inclined downward toward the curb part, and the apron part is provided with a water guide part for allowing rainwater to flow into the seepage trough, and a part of the water guide part is provided at the apron part and the corner part of the curb part. A water blocking portion is provided for blocking.

  The water guide portion corresponds to the water inlet of the water collecting basin and may itself have the same configuration or a different configuration. For example, a grating or the like may be fitted into the water guide portion. .

Moreover, the said water-impervious part obstruct | occludes a part of said water conveyance part, Comprising: It provides in the corner part of an apron part and a curbstone part.
As this water-impervious portion, for example, if the water guide portion has a structure in which grating is fitted, a structure in which a plate material such as an iron plate is arranged may be used, or a concrete or the like is filled in a gap near the end of the grating in advance and closed. The configuration is not particularly limited.
In addition, how to provide a water-impervious part with respect to the water-conducting part depends on the installation environment and the like, and may be adjusted as appropriate depending on, for example, the amount of rainfall and the installation interval of the facility. It is provided in a range of 20 to 80% of the part. In that case, for example, in the case where a plate material such as an iron plate is provided as the water shielding portion as described above, the area of the plate material such as the iron plate may be appropriately changed and disposed, and it is possible to respond quickly.

And rainwater flows from the upper side of the road with a high slope in the length direction of the road to the lower side, but when the flow rate of rainwater is small, the rainwater flows in a narrow width and the flow rate of rainwater is high The rainwater flows in a wide range. Here, the flow rate of rainwater refers to the amount of rainfall per hour.
In the present invention, since the upper surface of the apron portion has a slope that slopes downward toward the curb portion, when the flow rate of rain water is small, the rain water flows in a narrow width between the apron portion and the corner portion of the curb portion due to the slope gradient. Therefore, it does not flow in from the water guide part, but passes through the water shielding part and flows in from the water inlet of the catchment.
On the other hand, when the flow rate of rainwater is large, the rainwater flows in a wide width exceeding the water-impervious portion, so that it flows also from the water guide portion of the seepage trough and also from the water inlet of the catchment trough.

  As described above, according to the rainwater treatment structure and the rainwater treatment method of the present invention, the sewage at the beginning of rainfall can be directly introduced into the catchment basin without flowing into the seepage basin. And it can respond to a large amount of inflow water compared with the case of only a catchment basin, and can prevent, for example, clogging of a drainage channel, flooding of a main road, or flooding due to an increase in the amount of water in a river. In addition, since the initial sewage does not flow into the seepage basin, it is possible to prevent groundwater contamination and to prevent the penetration ability of the seepage basin from decreasing.

  The present invention will be described based on the embodiments of the drawings. In addition, this invention is not limited to an Example, It can implement in any way, unless the structure as described in a claim is changed.

FIG. 1 schematically shows an embodiment of the rainwater treatment structure of the present invention. In the drawing, which is the water side of an existing water collecting basin 1, an infiltration basin 5 is installed adjacent to the right rear side.
The existing catchment 1 sends rainwater to a water treatment facility (not shown) through a drainage channel (pipe) 2 schematically shown. (L-shaped) street block 3 is disposed as a cover material covering the upper opening of the water collecting basin 1, and a grating (water inlet 4) is disposed in the apron portion thereof.

  The newly formed seepage trough 5 is formed of a water permeation block made of porous concrete or the like having a water permeation function, and has an outlet 6 that communicates with the inside of the water collecting trough 1 inside. When there is inflow water exceeding the capacity, the water can be overflowed and transferred to the adjacent water collecting tank 1.

  As a cover material covering the opening upper part of the penetration wall 5, as shown in FIG. 2, an L-shaped street block 9 composed of a curb portion 7 which is a vertical piece portion and an apron portion 8 which is a horizontal piece portion is arranged, The apron 8 has an upper surface inclined downward toward the curb 7, and the apron 8 is provided with a water guide 10 that allows rainwater to flow into the seepage trough 5 and at the corners of the apron 8 and the curb 7. A water shielding part 11 that closes a part of the part 10 is provided.

  The L-shaped street block 9 is made of ordinary concrete. Although not shown, the curb portion 7 is located on the side of the road and the apron portion 8 is located on the road side.

  Further, as described above, the upper surface of the apron portion 8 is inclined downward toward the curbstone portion 7, but the road (not shown) is also inclined downward from the center to the side. It flows in the direction of the roadside and gathers at the corners of the apron portion 8 and the curbstone portion 7.

  The water guide portion 10 is a grating similar to the water inlet 4 of the water collecting basin 1, and the water shield portion 11 is an iron plate (plate material) that closes a part of the grating. The iron plate (plate material) is preferably heavy so as not to be blown away by gusts or the like, or preferably has a structure that is latched by grating.

In order to dispose the seepage trough 5, soil is excavated to an appropriate size as shown in FIGS. 3 and 4, and a water-permeable sheet 12 is disposed on the inner wall surface thereof.
Next, spread sand 13 is applied to the bottom, a single-grain crushed stone 14 is spread thereon, a bottom lump filter 15 is installed, and mortar 16 is cast and fixed at the corners. The bottom lump filter 15 is a water permeable block made of porous concrete or the like having a water permeable function.
Then, the penetrating gutter 5 having the above-described configuration is installed at a predetermined position, and a single-grain crushed stone 14 is constructed around the permeated trough 5 so as not to generate a gap.
After that, the L-shaped street block 9 to which the grating (water guide portion 10) and the water shielding portion 11 are attached in advance is placed so as to cover the upper opening portion of the seepage rod 5. In the figure, reference numeral 17 denotes a dust removing punching basket.

In the rainwater treatment structure of the present invention thus constructed, rainwater flows from the right back side to the left front side in FIG. 1, and from the right side to the left side in FIG.
As described above, when the rainwater flow rate is small, the rainwater flows in a narrow width, and when the rainwater flow rate is large, the rainwater flows in a wide width, but does not exceed the line A shown in FIG. The rainwater flows in the apron part 8 and the corner part of the curbstone part 7 as a narrow-width flow, passes over the water-impervious part 11, does not flow into the seepage trough 5 from the water guide part 10, and is adjacent to it. It flows into the catchment basin 1 from the water inlet 4. In addition, when the line A shown in FIG. 2 is exceeded, the rainwater flows in a wide width exceeding the impermeable portion 11, and therefore flows into the seepage trough 5 from the water conduit 10 and from the water inlet 4 to the drainage trough 1. Also flows in.

  Rainwater that has flowed into the seepage trough 5 from the water guide portion 10 permeates the surrounding single-grain quarry 14 from the side wall or bottom lump filter 15 having a water-permeable function, and further permeates to the outer periphery. When a large amount of rainwater flows in a short time, the water can be overflowed from the outlet 6 to the adjacent catchment 1 as described above.

  Rainwater that has flowed into the catchment basin 1 from the water inlet 4 can store inflow water of a predetermined volume or more, but the inflow water beyond that amount is not shown through the drainage channel (pipe) 2 as described above. Water can be sent to the facility.

Falling leaves, branches, garbage, etc. flow along with rainwater, but muddy water mixed with relatively fine sand, pebbles, etc. flows through the corners of the apron portion 8 and the curbstone portion 7, so It does not flow into the seepage trough 5 from the water conduit 10. Therefore, there is no adverse effect on the permeation function inside the permeation basket 5. That is, no clogging or the like occurs.
After all, muddy water mixed with relatively fine sand, pebbles, etc. flows into the catchment 1 from the water inlet 4 but settles at the bottom of the catchment 1 or drains together with the inflow water (pipe). ) 2 is sent to a water treatment facility (not shown).

  Further, relatively large fallen leaves, branches, dust, stones and the like are almost removed by the punching basket 17 for dust removal. Even if a part of the water flows in, if it is relatively light, it can be discharged together with rainwater from the outlet 6 to the adjacent catchment 1. Even if it remains inside the penetrating basket 5, relatively large fallen leaves, branches, dust, stones, etc. do not adversely affect the penetrating function inside the penetrating bowl 5. That is, it does not cause clogging.

  According to the rainwater treatment structure and rainwater treatment method of the present invention, when the flow rate of rainwater is small, the rainwater flows into the apron part and the corner of the curb part in a narrow width due to the slope, and therefore flows in from the water guide part. Without passing through the impermeable part, it flows into the catchment. That is, the sewage at the initial stage of rainfall does not flow into the seepage trough but can flow directly into the catchment trough. For this reason, since the initial sewage does not flow into the seepage basin, the groundwater is not polluted and the osmosis ability of the seepage basin is not reduced. On the other hand, when the flow rate of rainwater is large, the rainwater flows in a wide width exceeding the water shielding portion, and therefore flows into the seepage trough and the catchment trough. That is, it can cope with a large amount of inflow water as compared with the case of the catchment basin alone, and can prevent, for example, clogging of the drainage channel, flooding of the main road due to it, or flooding due to an increase in the amount of water in the river.

It is a perspective view which shows typically one Example of the rainwater treatment structure of this invention. It is an expanded sectional view which shows the upper part of the penetration wall in this invention, and an L-shaped street block. It is sectional drawing which shows the penetration ridge and its periphery in this invention. It is a front view of the rainwater treatment structure of the present invention.

Explanation of symbols

1 Catchment 2 Drainage channel (pipe)
3 (L-type) street block 4 Water guide port 5 Permeation channel 6 Outlet port 7 Curb portion 8 Apron unit 9 L-type city block 10 Water guide unit 11 Water blocking unit

Claims (2)

  When there is inflow water of a specified volume or more adjacent to an infiltration basin where rainwater is introduced and infiltrated into the basement, on the upper side of an existing or new water collection basin arranged on the side of the road An outlet that transfers water to the adjacent catchment basin is provided, and an L-shaped street block consisting of a curb portion that is a vertical piece part and an apron part that is a horizontal piece part is arranged as a cover material covering the upper part of the opening. The top surface of the apron part is inclined downward toward the curb part, and the apron part is provided with a water guide part that allows rainwater to flow into the inside of the seepage trough, and a part of the water guide part is closed at the corners of the apron part and the curb part. A rainwater treatment structure characterized in that a water shielding part is provided.   A rainwater treatment method using the rainwater treatment structure according to claim 1, wherein the rainwater is guided to an L-shaped street block on the seepage trough, and rainwater exceeding a certain flow rate is allowed to flow into the seepage trough from the water guide portion. A rainwater treatment method characterized in that rainwater that does not exceed a flow rate is allowed to pass through a water blocking portion to flow into a water collecting basin, and inflow water that exceeds a predetermined capacity of the seepage basin is transferred from the outlet to the water collecting basin.

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