JPH0338306Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rainwater infiltration system that allows rainwater to permeate into the ground of residential areas, roadside tree zones, parks, etc.

(Prior Art) In recent years, as many roads have been paved, phenomena such as an increase in the peak volume of floods, a shortage of groundwater, ground subsidence, and insufficient irrigation of trees have occurred. As a countermeasure for this, conventionally, a rainwater infiltration system as shown in Fig. 7 has been used.

This rainwater infiltration cell is constructed by using a porous concrete pipe of a predetermined length with a permeable pipe wall as the cell main body 1a, burying it underground, and forming a permeation layer 2a of crushed stone or the like at the bottom. It is something. still,
3a is an inflow pipe, which is connected to a rain gutter or the like. 4a is a lid with an overflow hole 5a
is provided.

However, in the conventional rainwater infiltration basin mentioned above,
The pipe wall of the main body of the main body is made of a porous water-permeable layer, while the bottom of the main body is covered with crushed stones to form a permeable layer. As the rainwater progresses, its function as a permeation basin is impaired, and if it becomes clogged, it cannot be replaced, and after a long period of time, rainwater no longer permeates underground.

The present applicant has previously applied for a rainwater infiltration system shown in Figs. 4 to 6 as a rainwater infiltration system that solves this problem. That is, a penetration hole 4b is provided in the side wall 1b, an inlet 2b is provided in the tangential direction of the circumference of the bottomed cell main body whose bottom inner peripheral surface 11b is approximately in the shape of an inverted cone, and one end 51b is connected to the outlet 3b. This is a rainwater infiltration basin in which a communicating discharge pipe 5b is provided in the main body at a predetermined distance from the bottom surface of the main body. In addition, 21b is an inflow pipe, 31b is an outflow pipe, and 6b
is the lid.

In this rainwater infiltration basin, for example, the amount of rainfall
If it is 10 mm or more, the rainwater is accelerated from the inlet 2b along the inner peripheral surface of the main body as a spiral vortex flow and flows into the center of the bottom, and the rainwater flows into the ground through the seepage hole 4b provided in the side wall. After the rainwater penetrates inside and reaches the position of the outflow port 3b, the rainwater is drained from the outflow pipe 31b to, for example, a sewer pipe through the discharge pipe 5b. At the same time, the sediment, etc. contained in the rainwater is concentrated at the center of the bottom of the cell due to the centripetal force of the vortex, so it is collected together with the rainwater in the discharge pipe 5.
b, and was discharged into the sewer pipe, and there was no accumulation of earth and sand inside the main body, and no particular problem occurred.

(Problem that the invention attempts to solve) However, if the amount of rainfall exceeds the infiltration capacity,
Due to the sudden rise in the water level of rainwater, there was a problem that the rainwater overflowed to the ground surface rather than infiltrating.

(Means for Solving the Problems) In view of the above problems, the present invention is capable of allowing rainwater to permeate into the ground for a long period of time without clogging and requiring no maintenance at all. Of course, the purpose is to provide a rainwater infiltration basin that will prevent rainwater from overflowing to the ground surface even if the amount of rainfall is large. An inlet is provided in the circumferential tangential direction of the side wall of the bottomed cell main body whose inner peripheral surface is approximately in the shape of an inverted cone, and an inverted L-shaped discharge pipe with one end communicating with the outlet is connected to the bottom cell main body. A rainwater infiltration basin is installed within the main body at a predetermined distance from the bottom surface, and has an overflow pipe that is open at the top and projects upward from the horizontal part of the discharge pipe.

(Function) As mentioned above, since the inlet for rainwater is provided in the tangential direction of the circumference of the side wall of the main body, and the inner circumferential surface of the bottom of the main body is approximately in the shape of an inverted cone, rainwater flows into the main body. The rainwater is accelerated as a spiral vortex along the inner circumferential surface of the main body and flows into the center of the bottom. The rainwater that flows in penetrates into the ground through the infiltration hole provided in the side wall, and after reaching the position of the outlet, the rainwater is drained from the outlet through the discharge pipe to, for example, a sewer pipe. at the same time,
Sediment and debris contained in rainwater are concentrated at the center of the bottom of the main unit due to the centripetal force of the vortex, and are discharged together with the rainwater to the sewer pipe through the discharge pipe.

In addition, an overflow pipe with an open top is provided in the horizontal part of the discharge pipe, so
If the amount of rainfall exceeds the infiltration capacity, a portion of the rainwater flowing into the enclosure will be drained into the sewer pipe through the overflow pipe, and will not overflow from the enclosure to the ground surface.

(Example) Hereinafter, an example of the rainwater infiltration basin of the present invention will be described based on the drawings.

Figure 1 is a partially cutaway front vertical sectional view showing an embodiment of the rainwater infiltration basin of the present invention, Figure 2 is a right side view,
FIG. 3 is a sectional view taken along the line of FIG. 1.

Reference numeral 1 denotes a bottomed cell main body made of vinyl chloride resin or the like, and is composed of a lower cell 2, an upper cell 3, and an additional ring 4 for height adjustment.
Fitting portions 2 are provided on the upper edges of the lower cell 2 and upper cell 3.
1 and 31 are formed, and the lower edges of the upper cell 3 and the additional ring 4 can be fitted and connected. The outer diameter of the lower edge of the upper square 3 and the additional ring 4 is the lower square 2.
The inner diameter of the fitting portion 21 is approximately equal to the inner diameter of the fitting portion 21 .
A rainwater inlet 5 is provided on the side wall of the lower cell 2,
An outlet 6 is formed in the side wall of the upper cell 3.
An inflow pipe 51 and an outflow pipe 61 are provided at each mouth. The inflow pipe 51 is provided with an inclination of about 5 degrees. The outflow port 6 is provided above the inflow port 5. The inlet 5 is provided in the circumferential tangential direction of the side wall of the lower cell 2, as shown in FIG. The inflow pipe 51 is connected to a rain gutter (not shown), and the outflow pipe 61 is connected to a sewer pipe (not shown). The bottom inner circumferential surface 22 of the lower cell 2 is approximately shaped like an inverted cone. 7,
A plurality of circular penetration holes 8 are provided on the side walls of the lower cell 2 and the upper cell 3. Penetration hole 7,
8 may be provided so as to be located at least above the inlet 4.

Reference numeral 9 denotes an inverted L-shaped discharge pipe, which is constructed by connecting a horizontal short pipe 91 and a vertical short pipe 92 with an elbow 93. One end 91a of the short pipe 91 is communicated with the outlet 6, while one end 92a of the short pipe 92 is installed in the main body 1 at a predetermined distance from the bottom surface of the central part of the lower cell 2. One end 92a is widened in a tulle shape. A plurality of through holes 10 are provided in the lower side wall of the short tube 92 .
The inner diameter of the discharge pipe 9 may be approximately 20 to 40 mm, and the distance between one end 92a of the discharge pipe and the bottom surface of the lower box 2 may be approximately 20 to 40 mm. Through hole 1
The size of 0 should be about 3 to 10 mm,
Further, the position of the through-hole may be determined so that even if a yearly (or half-yearly) amount of sediment, etc. contained in rainwater accumulates inside the main body of the cell, the through-hole will not be completely covered.

Reference numeral 11 denotes an overflow pipe, which is provided to protrude upward from the pipe wall of the short pipe 91, which is the horizontal portion of the discharge pipe 9. The overflow pipe 11 is open at the top and communicates with the short pipe 91 at the bottom. The upper part of the overflow pipe 11 is a socket, and the height can be adjusted by connecting a short pipe. Furthermore, 1
2 is a lid.

Next, the manner of use of the above embodiment will be explained. The rainwater infiltration basin of the present invention is used, for example, by being buried in a residential area. Rainwater falling on the roof of the house flows into the main body 1 through the inflow pipe 51 through the rain gutter. At this time, since the inflow pipe 51 is provided in the circumferential tangential direction of the side wall of the lower cell 2, the rainwater is accelerated as a spiral vortex along the inner circumferential surface of the lower cell 2 and flows into the bottom, and the water level is rising. When the water level reaches the position of the seepage hole 7, rainwater begins to seep into the ground through the seepage hole 7. At this time, the dirt and debris contained in the rainwater are concentrated at the center of the bottom of the lower cell 2 by the centripetal force of the accelerated vortex flow, so that they are not discharged through the seepage holes 7.

Furthermore, when the water level rises and exceeds the position of the outflow port 6, the rainwater is drained to the sewer pipe through the discharge pipe 9 and permeates into the ground through the seepage hole 8. At the same time, due to the centripetal force of the accelerated eddy current, the sediment concentrated at the center of the bottom of the main body 1 is discharged together with rainwater into the sewer pipe through the discharge pipe 9, and the rainwater permeates into the ground through the seepage holes 7 and 8. The water is clean and does not contain sediment.

Furthermore, if the amount of rainfall exceeds the infiltration capacity, a portion of the rainwater flowing into the main body 1 is drained to the sewer pipe through the overflow pipe 11, so that the rainwater does not overflow from the main body to the ground surface.

To change the positional relationship between the rainwater inlet 5 and the rainwater outlet 6, the upper box 3 can be rotated in the circumferential direction.

In addition, in this invention, it is also possible to use an extension ring in combination between the upper cell and the lower cell. Alternatively, it is preferable to carve an annular groove for punching. Alternatively, it may consist of an upper cell and a lower cell excluding the additional ring. Furthermore, the cell main body may not be divided into an upper cell and a lower cell, but may be formed integrally. The main body may be made of a low foaming synthetic resin material (polypropylene, polyvinyl chloride, etc.). There may be no through hole provided in the lower side wall of the discharge pipe.

(Effects of the invention) As described above, according to the invention, the inlet for rainwater is provided in the tangential direction of the circumference of the main body, and the inner circumferential surface of the bottom of the main body is approximately in the shape of an inverted cone. Rainwater flowing into the cell is accelerated in a spiral vortex along the inner circumferential surface of the cell main body and flows into the bottom. After reaching the location of the outlet, the rainwater is drained from the outlet through the discharge pipe, for example into a sewer pipe.

In addition, due to the centripetal force of the eddy current, the sediment and debris contained in the rainwater are concentrated at the center of the bottom of the main body of the cell, and are therefore discharged together with the rainwater through the discharge pipe into the sewer pipe. For this reason, earth and sand etc. do not accumulate in the permeation chamber. Furthermore, since these are not discharged into the ground through the seepage holes provided in the side walls, no maintenance is required at all, and the infiltration capacity of the seepage basin can be maintained over a long period of time.

Furthermore, since the horizontal part of the discharge pipe is provided with an overflow pipe that is open at the top,
If the amount of rainfall exceeds the infiltration capacity, a portion of the rainwater flowing into the enclosure will be drained into the sewer pipe through the overflow pipe, and will not overflow from the enclosure to the ground surface.

In addition, as shown in the example, if the cell main body is configured to be removably fitted into the lower cell and the upper cell, the lower cell and the upper cell will fit regardless of the positional relationship of the place where the penetration cell is installed. The positional relationship between the inlet and outlet of rainwater can be changed arbitrarily by simply shifting the fitting state of the rainwater in the circumferential direction. Therefore, it is only necessary to prepare one type of infiltration basin, reducing processing costs and construction costs. Costs will be cheaper.

[Brief explanation of drawings]

Figure 1 is a partially cutaway front vertical sectional view showing an embodiment of the rainwater infiltration basin of the present invention, Figure 2 is a right side view,
Figure 3 is a sectional view along the line of Figure 1, and Figure 4-
Figure 6 shows the rainwater infiltration basin that was applied for earlier. Figure 4 is a front view, Figure 5 is a sectional view taken along the line - Figure 4, and Figure 6 is a sectional view taken along the line - Figure 4. FIG. 7 is a longitudinal sectional view showing a conventionally known rainwater infiltration basin. 1: Main body, 2: Lower square, 21: Fitting part,
22: Bottom inner peripheral surface, 3: Upper square, 4: Extension ring, 5: Inlet, 51: Inlet pipe, 6: Outlet, 6
1: Outflow pipe, 7, 8: Penetration hole, 9: Discharge pipe, 9
1,92: Short pipe, 11: Overflow pipe.

Claims (1)

[Scope of utility model registration request] An inverted L-shaped inlet is provided in the circumferential tangential direction of the side wall of the bottomed cell body, which has a penetration hole in the side wall and an inner peripheral surface of the bottom that is approximately in the shape of an inverted cone, and one end communicates with the outflow port. a discharge pipe is installed in the main body at a predetermined distance from the bottom of the main body,
A rainwater infiltration system characterized in that an overflow pipe that is open at the top protrudes upward from the horizontal part of the discharge pipe.