JPH11247271A - Rainwater infiltration sump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater infiltration sump easy to maintain in which dust is hardly settled in the sump bottom. SOLUTION: An inlet-side drain pipe connection port 7a and a discharge-side drain pipe connecting port 7b are formed on a side wall part 4, these drain pipe connecting ports 7a, 7b are connected by a groove-shaped part 8, and water infiltration holes 5, 5a are formed on either one or both of the side wall part 4 and a bottom wall part 6, whereby a rainwater filtration sump 1 is formed. Since a small quantity of rainwater in the starting stage of raining containing dust is carried in the groove-shaped part 8 without overflowing the groove-shaped part 8 and discharged through the discharge-side drain pipe connecting port 7b, only a large quantity of rainwater in the stage of main raining hardly containing dust overflows the groove-shaped part 8, and it infiltrates and is drained through the water infiltration holes 5, 5a, the dust is hardly settled in the sump bottom part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater infiltration basin that is easy to maintain.

[0002]

2. Description of the Related Art In an urbanized area where there are few unpaved roads or open spaces, rainwater falling on houses, parking lots, roads, etc. flows into rivers and the like through gutters without penetrating into the ground. A large amount of rainwater concentrates on rivers, and exceeds the capacity of rivers in a short time, causing so-called urban flooding.

[0003] In an urbanized area where rainwater hardly penetrates into the ground as described above, a large amount of groundwater pumped by factories or the like is a major cause of land subsidence.

[0004] Under such circumstances, a rainwater infiltration basin for infiltrating rainwater falling on a house or the like into the ground has been developed and buried in residential land. FIG. 8 shows a general example of such a rainwater seepage measure.

That is, the rainwater infiltration box 100 has a large number of water-permeable holes 101 in the side wall and the bottom wall, and a pair of drain pipe connection ports 102a and 102b are formed in the side wall. One drain pipe connection port 102a is connected to an inflow-side drain pipe 104a that allows rainwater to flow from the deep gutter 103 of the house into the basin, and the other drain pipe connection port 102b receives rainwater in the basin. A drain pipe 104b on the discharge side for discharging to a drain groove (not shown) is connected and buried in the residential land. Reference numeral 105 denotes a height adjusting cylinder connected to the upper end opening of the rainwater infiltration box 100, and reference numeral 106 denotes a lid attached to the upper end opening of the height adjusting cylinder 105.

When such a rainwater infiltration basin 100 is buried, the rainwater that has fallen on the roof of the house flows down the hard gutter 103, flows into the inside of the rainwater infiltration basin 100 from the inflow-side drain pipe 104a, and passes through the water-permeable hole 101. Drains penetrate the ground. Excess rainwater is discharged from the rainwater infiltration basin 100 to a drain (not shown) through a drain pipe 104b on the discharge side.

[0007]

However, in the above-described rainwater infiltration basin 100, dust 107 such as dust and dirt adhering to the roof or eaves of a house flows into the basin together with rainwater and deposits on the bottom of the basin. Therefore, there is a problem that the water-permeable hole 101 in the bottom wall portion is clogged with the dust 107, and the permeation ability is reduced. Therefore, it is necessary to periodically clean the inside of the rainwater infiltration basin 100 to remove the dust 107, and the maintenance is troublesome.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a rainwater infiltration basin that is very easy to maintain and hardly generates dust accumulation.

[0009]

To achieve the above object, a rainwater infiltration basin according to claim 1 of the present invention has a drain pipe connection port on an inflow side and a drain pipe connection port on a discharge side in a side wall portion. In a rainwater infiltration basin having a water permeation hole on one or both of a side wall and a bottom wall, a drain pipe connection port on an inflow side and a drain pipe connection port on a discharge side are connected by a groove-shaped part. Things.

In such a rainwater infiltration basin, an inflow-side drainage pipe is connected to an inflow-side drainage pipe connection port, and a discharge-side drainage pipe is connected to a discharge-side drainage pipe connection port, similarly to the conventional rainwater infiltration basin. Connected and buried underground. When buried in this way, when it rains, rainwater that has fallen on the roof flows from the deep gutter through the drainage pipe on the inflow side into the channel-shaped part of the rainwater infiltration basin. Since the amount of water flowing into the channel is small, the inflowing rainwater flows through the channel without overflowing from the channel, and is discharged from the drainage pipe connection on the discharge side to the drainage channel through the drainage pipe on the discharge side. Is done. When the rain falls for a while after the beginning of rainfall, the amount of rain flowing into the channel increases and exceeds the permissible flow rate of the channel, so that excessive rainwater flowing into the channel enters the rainwater from the channel. The water overflows into the basin, penetrates into the ground through the permeable holes, and is drained.

In that case, most of the dust adhering to the roof is washed by rainwater at the beginning of the rainfall, when the amount of rainfall is small, and flows into the groove-shaped portion of the rainwater infiltration basin together with the rainwater. The water is discharged from the drain pipe on the discharge side to the drain without overflowing. Therefore, dust does not settle on the bottom of the rainwater infiltration basin at the beginning of the rainfall, and at the time of the main descent after a while from the start of the rain, the rainwater contains almost no dust. Even if it overflows from the channel into the rainwater infiltration basin, no dust is deposited.

As described above, in the rainwater infiltration basin according to the first aspect of the present invention, dust does not substantially settle on the bottom of the basin, so that clogging of the water permeation hole does not occur. Maintenance is extremely easy because there is no need to clean and remove dust as frequently as a basin.

Next, in the rainwater infiltration basin according to the second aspect of the present invention, in the rainwater infiltration basin of the first aspect, the position of the inflow-side drain pipe connection port is higher than the position of the discharge-side drain pipe connection port. Then, a predetermined flow gradient is given to the groove-shaped portion.

If a predetermined flow gradient is provided in the groove-shaped portion as in the rainwater infiltration basin, the rainwater flows smoothly even if the flow rate is small, so that dust contained in the rainwater collects at the bottom of the groove-shaped portion. And is discharged with rainwater. Therefore, it is not necessary to frequently clean the groove-shaped portion to remove dust, thereby making maintenance easier.

Further, the rainwater infiltration basin according to claim 3 of the present invention is characterized in that, in the rainwater infiltration basin according to claim 1 or 2, a weir plate is provided at a side edge of the groove-shaped portion so as to be freely adjustable in height. It is assumed that.

In such a rainwater infiltration basin, the allowable flow rate of the groove portion can be increased or decreased by adjusting the height of the weir plate provided on the side edge of the groove portion. Is to ensure that all incoming rainwater flows through the channel without draining from the channel, and is drained off. It can be easily controlled so that it overflows into the basin beyond the flow rate, penetrates into the ground through the permeable holes, and is drained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a rainwater infiltration basin according to an embodiment of the present invention, FIG. 2 is a plan view of the rainwater infiltration basin, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG. 5, FIG. 4 is a sectional view taken along line BB of FIG.
FIG. 4 is an explanatory diagram of one usage example of the rainwater seepage measure.

The rainwater infiltration basin 1 is made of polypropylene or other thermoplastic resin, and has a circular upper end opening to which a height adjusting cylinder 2 (see FIG. 5) is fitted and connected. Are formed.

On the side wall 4 of the rainwater infiltration basin 1, a large number of water permeable holes 5 small enough to prevent intrusion of earth and sand and crushed stone are formed, and the bottom wall 6 has a substantially semicircular shape. A large water-permeable hole 5a (water-permeable opening) is formed.

Although a small water-permeable hole 5 may be formed in the bottom wall 6, since the bottom wall 6 does not receive earth pressure, a large water-permeable hole 5a (water-permeable opening) is formed as in this embodiment. It is desirable to increase the penetration capacity. It is sufficient if the water-permeable holes are formed in either the side wall 4 or the bottom wall 6. However, when formed in both the side wall 4 and the bottom wall 6 as in this embodiment, the permeability is improved. Is preferred.

In the rainwater infiltration box 1, an inflow-side drain pipe connection port 7a and an outflow-side drain pipe connection port 7b are formed to protrude from the upper portion of the side wall portion 4 in opposite directions. The connection ports 7 a and 7 b are connected by a groove 8. As shown in FIGS. 2 and 3, the drainage pipe connection ports 7 a and 7 b and the groove portion 8 are formed so as to be deviated to one side from the center of the rainwater infiltration basin 1. The side portion is a water reservoir 9 for temporarily storing rainwater.

As shown in FIG. 4, the inflow-side drain pipe connection port 7a is formed at a position higher than the discharge-side drain pipe connection port 7b, and a predetermined flow gradient is applied to the groove-shaped portion 8. Have been. For this reason, even if the amount of rainwater flowing into the groove portion 8 from the inflow-side drain pipe connection port 7a is small, the rainwater flows smoothly through the groove portion 8 and dust contained in the rainwater accumulates at the bottom of the groove portion 8. There is no. It is desirable that the flow gradient of the groove portion 8 is set to about 1/100 to 3/100 so that rainwater flows smoothly.

The cross-sectional shape of the groove 8 is substantially semicircular in this embodiment, but is not limited to this. For example, a V-shape or U-shape at the lower end where water flows well. Various cross-sectional shapes such as a letter shape can be adopted.

The cross-sectional area of the inner portion of the channel 8 where rainwater flows is determined by the average inflow of rainwater per fixed time at the beginning of rainfall and the average per hour of rainfall after the rainfall. In consideration of the average inflow of rainwater, the permissible flow per unit time of the channel 8 is larger than the inflow at the beginning of falling,
In addition, the cross-sectional area may be specifically determined so as to be smaller than the inflow amount at the time of the final descending.

The rainwater infiltration basin 1 having the above structure is buried and constructed as shown in FIG. That is, the rainwater infiltration basin 1 is installed on the crushed stone 10 that promotes the penetration of rainwater, and the drainage pipe 12a that allows the rainwater to flow into the basin from the hard gutter 11 of the house is connected to the drainage pipe connection port 7a on the inflow side. Then, a drain pipe 12b for discharging rainwater in the basin to a drain (not shown) is connected to a drain pipe connection port 7b on the discharge side. Then, the height adjusting cylinder 2 is fitted and connected to the fitting groove 3 at the upper end of the cell, and the lid 13 is further covered and embedded thereon.

When buried in this way, at the beginning of rainfall, a relatively small amount of rainwater containing dust passes from the deep gutter 11 through the drainage pipe 12a on the inflow side to the channel-shaped portion 8 of the rainwater infiltration basin 1. Flow into the groove 8 without overflowing from the groove 8
, And is discharged to a drain (not shown) through a drain pipe 12a on the discharge side. Then, after a while from the beginning of the rain, when the main rain falls, a large amount of rainwater substantially not including dust flows into the channel 8 and exceeds the permissible flow rate of the channel 8, so that excessive rainwater is generated. Rainwater seepage measure 1 from 8
, Overflows into the water reservoir 9, and penetrates and drains into the ground through the water-permeable holes 5, 5a.

As described above, since the rainwater infiltration basin 1 does not allow the rainwater containing dust at the start of rain to overflow from the groove 8 but only the rainwater containing no dust overflows, the dust The sediment is deposited on the bottom of the water reservoir 9 of the infiltration basin 1 and the infiltration holes 5, 5
There is no clogging of a. Therefore, the rainwater infiltration basin 1 does not need to be cleaned frequently to remove dust unlike the conventional rainwater infiltration basin, so that maintenance is extremely easy. In particular, the rainwater infiltration basin 1 is provided with a flow gradient in the channel 8 so that the rainwater flows smoothly even if the flow rate is small, so that the dust contained in the rainwater does not collect at the bottom of the channel 8. Therefore, the cleaning of the groove portion 8 is not required, and the maintenance is further facilitated.

The rainwater infiltration basin 1 of the embodiment described above
By providing the drainage pipe connection ports 7a, 7b and the groove-shaped portion 8 so as to be deviated from the center of the box to one side, rainwater is allowed to overflow from one side edge of the groove-shaped portion 8;
The a, 7b and the groove portion 8 may be provided on the center line of the box without being displaced, and rainwater may overflow from both side edges of the groove portion 8.

FIG. 6 is a longitudinal sectional view of a rainwater infiltration basin according to another embodiment of the present invention, and FIG. 7 is a horizontal sectional view of the rainwater infiltration basin.

The rainwater infiltration basin 1 is provided with a weir plate 14 at one side edge of the groove 8 so as to be freely adjustable in height. Are elastically sandwiched and held by a pair of left and right groove-shaped holding portions 15, 15 formed on the inner surface of the.

In such a rainwater infiltration box 1, when the weir plate 14 is slid up and down against the holding force of the groove-shaped holding parts 15, 15, the height of the weir plate 14 is changed to change the groove shape. Since the allowable flow rate of the part 8 can be easily increased or decreased, the rainwater that flows in does not overflow from the groove-shaped part 8 at the beginning of rain, and when the rain falls, the amount of rain that flows in is reduced There is an advantage that it can be easily controlled so that the flow exceeds the allowable flow rate of the section and overflows into the water reservoir 9 in the basin.

Other structures and operational effects of this rainwater infiltration basin 1 are the same as those of the above-mentioned rainwater infiltration basin 1, so that FIGS.
In the drawings, the same reference numerals are given to the same members, and the description is omitted.

In each of the rainwater infiltration basins described above, the groove-shaped portion 8 is integrally formed, but separately prepared groove-shaped members are connected to the inflow-side drain pipe connection port 7a and the discharge-side drain pipe connection port 7b.
You may make it bridge | hang between and attach it.

In the above-mentioned rainwater infiltration basin, the drainage pipe connection port 7a on the inflow side and the drainage pipe connection port 7b on the discharge side are formed one by one. 7a
May be formed, and the respective drainage pipe connection ports 7a on the inflow side and the drainage pipe connection ports 7b on the outflow side may be connected by a groove-shaped portion that joins on the way.

Further, a support leg is provided from the lower surface of the groove portion 8,
You may comprise so that the installation stability of the rainwater seepage measure 1 may be improved.

[0037]

The rainwater infiltration basin according to the present invention can prevent dust from accumulating on the bottom of the basin and clogging the water-permeable holes. There is a remarkable effect that a troublesome operation is substantially unnecessary and maintenance becomes extremely easy.

In the rainwater infiltration basin according to the preferred embodiment, the flow of rainwater in the channel portion is smoothed, so that there is no danger of dust accumulating in the channel portion, and the allowable flow rate in the channel portion is optimized. Also, there is an effect that the flow rate of the groove-shaped portion can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rainwater seepage measure according to an embodiment of the present invention.

FIG. 2 is a plan view of the rainwater seepage measure.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is an explanatory diagram of one usage example of the rainwater seepage measure.

FIG. 6 is a front-rear cross-sectional view of a rainwater seepage measure according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view in the left-right direction of the rainwater seepage measure.

FIG. 8 is an explanatory view of a conventional rainwater seepage measure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rainwater infiltration basin 4 Side wall part 5 Small water-permeable hole 5a Large water-permeable hole (water-permeable opening) 6 Bottom wall part 7a Inlet side drainage pipe connection port 7b Drainage side drainage pipe connection port 8 Groove part 14 Weir plate 15 Groove holding Department

Claims (3)

[Claims] 1. A rainwater infiltration basin having a drainage pipe connection port on the inflow side and a drainage pipe connection port on the discharge side in the side wall, and having a water permeability hole in one or both of the side wall and the bottom wall. A rainwater infiltration basin characterized by connecting the drainage pipe connection on the drain side and the drainage pipe connection on the discharge side with a groove. 2. The flow channel according to claim 1, wherein the position of the inflow-side drain pipe connection port is higher than the position of the discharge-side drain pipe connection port, and a predetermined flow gradient is imparted to the groove-shaped portion. Rainwater infiltration basin. 3. The rainwater infiltration basin according to claim 1, wherein a weir plate is provided at a side edge of the groove-shaped portion so as to be adjustable in height.