JPH0137030Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rainwater infiltration basin that allows part of the rainwater that falls on wide open areas such as roads and parks to infiltrate into the ground.

Traditionally, rainwater that falls on roads has been collected in rainwater basins by roadside gutters and discharged into rivers through sewer pipes, but during heavy rains, this can cause rivers to overflow. This has caused damage such as sewage backing up and flooding roads.

Recently, rainwater infiltration pipes have been installed that reach the underground permeation layer, and rain that falls on roads, etc. is introduced into the underground permeation layer through the rainwater permeation pipe. Although it has been proposed to allow rainwater to infiltrate, it is of course possible not only when the collected rainwater is introduced directly into the rainwater infiltration pipe, but also when the collected rainwater is once stored in a rainwater storage tank and then the rainwater is introduced directly into the rainwater infiltration pipe. Even if the rainwater is introduced into a water pipe for infiltration, the rainwater from the previous rainwater is stored in the rainwater storage tank, and the entire amount of rainwater from the beginning to the end of the rain will be transferred underground through the water pipe for infiltration. It will be introduced into the permeation layer. However, it is known that when rainwater is continuously introduced into an underground percolation layer, the rainwater infiltrates efficiently at the initial stage of introduction, but the efficiency gradually decreases. Therefore,
When rainwater is introduced into the underground percolation layer from the beginning of rainfall, the infiltration efficiency of rainwater does not increase during the peak period of rainfall when it is most needed, and the disadvantage is that the desired effect cannot be fully demonstrated. ing. Also,
When rainwater collected in a rainwater storage tank is initially introduced and stored, the newly introduced rainwater stirs the old stored water, causing the rainwater to be initially introduced into the rainwater storage tank. As a result, the amount of suspended solids in the flowing water introduced into the rainwater infiltration pipe, as well as the BOC (biochemical oxygen demand) value, tend to become abnormally high at the beginning. However, it has disadvantages such as clogging of filters due to the precipitates and contamination of underground water by BOC.

The purpose of the present invention is to eliminate such drawbacks, and the purpose of the present invention is to provide a system in which the side wall and lower opening of the rainwater basin, in which the sewage pipe is opened in the side wall, are located in the permeation layer underground. The bottom of a sewage water pipe that connects the side wall of a rainwater infiltration water pipe buried underground with a connecting pipe, and the bottom opening position of the connecting pipe that opens into the side wall of the rainwater tank. By setting the opening position higher than the opening position, the rainwater collected in the rainwater tank is initially discharged into rivers etc. via the sewer pipe, and then reaches the peak of rainfall and the water level in the rainwater tank remains constant. When the rainwater rises above the above level, the excess rainwater is diverted to the rainwater infiltration conduit through the connecting pipe, and a rainwater infiltration system is installed that can effectively infiltrate a large amount of rainwater into the underground permeation layer. This is what we provide.

Another object of the present invention is to connect the side wall of the rainwater basin and the sidewall of the rainwater infiltration conduit pipe with a connecting pipe, and to determine the opening position of the bottom of the connecting pipe that opens into the sidewall of the rainwater basin. By opening the sewage conduit pipe into the side wall of the rainwater tank higher than the bottom opening position, water is collected into the rainwater tank and mixed with old stored water that had accumulated in the rainwater tank, causing a large amount of stored water sediment to float. The initial rainwater is discharged into the river via the sewage pipes, and as time passes from the start of rain to the peak of the rainfall, most of the accumulated water sediment has flowed out and the amount of suspended matter decreases. To provide a rainwater infiltration basin that prevents clogging of filters by allowing only rainwater to flow into the rainwater infiltration water pipe, and allows rainwater to effectively infiltrate into the underground infiltration layer. be.

Furthermore, another object of the present invention is to connect the side wall of the rainwater basin and the sidewall of the rainwater infiltration conduit pipe with a connecting pipe, and to determine the opening position of the bottom of the connecting pipe that opens into the sidewall of the rainwater basin. By opening the sewage conduit pipe into the side wall of the rainwater tank higher than the bottom opening position, water is collected into the rainwater tank and mixed with old stored water that had accumulated in the rainwater tank, causing a large amount of stored water sediment to float. Initial rainwater with a high BOC value, etc.
Water is discharged from sewage pipes into rivers via sewage pipes, and after the time has elapsed from the start of rain to the peak of rainfall,
To prevent groundwater contamination due to BOC caused by rainwater infiltration by allowing only rainwater with a reduced BOC value, etc., to flow into the rainwater infiltration water pipe due to less floating matter after most of the stored water sediment has flowed out. This provides a barrier to rainwater infiltration.

That is, the present invention provides a rainwater basin with a sewage water pipe opening in the side wall, and also installs a rainwater infiltration water pipe buried underground so that its lower opening is located in the permeation layer of the ground. A pipe bottom of a sewage conduit pipe that connects the side wall of a rainwater infiltration water conduit pipe and the side wall of a rainwater basin with a connecting pipe, and also connects the bottom opening position of the connecting pipe that opens into the side wall of the rainwater basin to the side wall of the rainwater basin. The gist of this is the structure of the rainwater infiltration basin, which is characterized by being raised higher than the opening position.

Next, the present invention will be explained according to an illustrated embodiment. 1 is a rainwater basin, which collects rainwater collected by a road 2, such as a gutter 3, or a park path, etc. The rainwater collected in this rainwater basin 1 is usually collected in the sewage water pipe 4.
The waste is guided to the sewer pipe and discharged into the river. As the sewage water pipe 4, commonly used water pipes such as those having a circular or square cross section can be used. The existing rainwater basin 1 will be used. Reference numeral 5 denotes a rainwater infiltration water conduit pipe, which is buried underground so that its lower opening is located in the underground infiltration layer 6. The underground permeable layer 6 may be any layer that allows water to penetrate, such as the Kanto loam layer,
A sand layer, a gravel layer, etc. are suitable, and when there is no suitable permeable layer underground, a crushed stone layer etc. can be artificially formed and used underground. Furthermore, it is effective to select these permeable layers 6 located below the roadbed of the adjacent road 2 in order to prevent damage to the road 2. Reference numeral 7 is a permeation pipe, which has a large number of permeation holes 8 in the side wall of the rainwater permeation water conveyance pipe 5 located below the roadbed, and is provided to effectively permeate the rainwater into the permeation layer 6. . The permeation tube 7 may be of a rigid type as shown in FIG. 1 or of a horizontal type as shown in FIGS. 2 and 3. Further, the penetration hole 8 may have an appropriate shape such as a circular shape or a slit shape. Numeral 9 is a connecting pipe that connects the side wall of the rainwater basin 1 and the sidewall of the rainwater infiltration water pipe 5. When the rainwater collected in the rainwater basin 1 reaches a certain water level or higher, this This is for diverting rainwater to the water infiltration pipe 5 via the connecting pipe 9. Therefore, the bottom of the connecting pipe 9 is opened at a higher position than the bottom of the opening of the sewage water pipe 4 that opens into the rainwater basin 1. In addition, if the connecting pipe 9 is inclined so that the opening position relative to the rainwater infiltration conduit pipe 5 is higher than the opening position to the rainwater infiltration pipe 5, the earth and sand in the rainwater infiltration pipe 5 can be removed from the rainwater infiltration pipe 5 side. can be prevented from flowing into the As the connecting pipe 9, commonly used water conduit pipes such as those having a circular cross section or square cross sections can be used. Reference numeral 10 denotes a connecting pipe filter, which is fixedly or removably attached to the opening on the rainwater basin 1 side of the connecting pipe 9. Cloth, pine wood, etc. are used as the filter material, and a stretched net is used as the filter material. It is supported like a sand German bridge. This connecting pipe filter 10 is for preventing dust, dirt, etc. in the rainwater basin 1 from entering the connecting pipe 9. Reference numeral 11 denotes a water conduit filter, which is disposed inside the rainwater infiltration water conduit pipe 5, in which several layers of filter material 13 and mesh 14 are alternately stacked in a cylindrical guide tube 12. It is installed with filter material 1
As material 3, paper, nonwoven fabric, woven fabric, sponge, activated carbon, etc. are appropriately selected and used. This introduction pipe filter 11 includes, for example, an upper lid 15 as shown in the figure.
It is suspended by a rope 16 tied to the rainwater, and is used to remove soil particles, floating matter, oil, heavy metals, etc. contained in rainwater. 1
Reference numeral 7 denotes a packing material, which is formed into a funnel shape from a soft rubber material or the like and is provided at the upper outer edge of the guide tube 12 in the water pipe filter 11.
When inserted into the guide tube 12, it lightly contacts the inner surface of the rainwater infiltration conduit pipe 5 to prevent water from leaking from the outside of the guide tube 12.

The present invention is constructed as shown above, and includes a side wall of a rainwater tank with a sewage water pipe opening on the side wall, and a rainwater water pipe buried underground so that the opening at the bottom is located in the permeation layer of the ground. In addition to connecting the side wall with a connecting pipe, the bottom opening position of the connecting pipe opening into the side wall of the rainwater basin is set higher than the bottom opening position of the sewage conduit pipe opening into the sidewall of the rainwater basin, so that rainwater can be In the early stages, the rainwater that is collected is discharged into rivers etc. via sewage pipes.
Only when the rainwater peak reaches its peak and the water level in the rainwater tank rises above a certain level, the excess rainwater is diverted to the rainwater infiltration pipe through the connecting pipe, and a large amount of rainwater is pumped into the underground permeation layer. Penetrate effectively,
It has the practical benefit of achieving the intended purpose, such as preventing flooding of roads.

In addition, when using the present invention, the side wall of the rainwater basin and the sidewall of the rainwater infiltration conduit pipe are connected by a connecting pipe, and the bottom opening position of the connecting pipe that opens into the sidewall of the rainwater basin is opened at the side wall of the rainwater basin. Because the opening position is higher than the bottom opening position of the sewage water pipe, the initial rainwater is collected in the rainwater tank and mixed with the old stored water that had accumulated in the rainwater tank, and a large amount of stored water sediment is suspended. , the water is discharged from the sewage pipe into the river via the sewage pipe, and after a period of time has elapsed from the start of rain to the peak of rainfall, most of the accumulated water sediment has flowed out, and only rainwater with less floating matter is collected as rainwater. It has the practical benefit of allowing rainwater to flow into the infiltration water pipe, thereby preventing clogging of filters, etc., and allowing rainwater to effectively infiltrate into the underground infiltration layer.

Furthermore, according to the present invention, the side wall of the rainwater basin and the sidewall of the rainwater infiltration conduit pipe are connected by a connecting pipe, and the bottom opening position of the connecting pipe that opens in the sidewall of the rainwater basin is opened in the sidewall of the rainwater basin. Because the opening position is higher than the bottom opening of the sewage pipe, the water is collected in the rainwater tank and mixed with the old stored water that had accumulated in the rainwater tank, causing a large amount of stored water sediment to float.
Initial rainwater with a high BOC value, etc. is discharged into rivers via sewer pipes, and after the time has elapsed from the start of rain to the peak of rainfall, most of the stored water sediment has flowed out and becomes suspended. It also has the practical benefit of allowing only rainwater with a reduced BOC value to flow into the rainwater infiltration pipe, thereby preventing groundwater contamination due to BOC caused by rainwater infiltration.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Figure 1 is a vertical cross-sectional view of a rigid type of penetration pipe installed in a rainwater penetration pipe, and Figure 2 is a vertical sectional view of a penetration pipe installed in a rainwater penetration pipe. FIG. 3 is a side view of a horizontal permeation pipe, FIG. 4 is a longitudinal side view of a water conduit filter, and FIG. 5 is a bottom view of the water conduit filter. The symbols in the figure are explained as follows. 1 is a rainwater tank, 2 is a road, 3 is a side gutter, 4 is a sewage pipe, 5 is a rainwater infiltration pipe, 6 is a permeation layer, 7
8 is a penetration pipe, 8 is a penetration hole, 9 is a connecting pipe, 10 is a connecting pipe filter, 11 is a water pipe filter, 12 is a guide tube, 13 is a filter material, 14 is a net, 15 is an upper cover, 16 is a rope, 17 is Packing material.

Claims (1)

[Scope of utility model registration request] A rainwater basin with a sewage water pipe opening on the side wall is provided, and a rainwater seepage water pipe is buried underground so that the opening at the bottom of the pipe is located in the underground permeation layer. The side wall of the rainwater basin is connected to the sidewall of the rainwater basin by a connecting pipe, and the bottom opening position of the connecting pipe that opens into the sidewall of the rainwater basin is higher than the bottom opening position of the sewage conduit pipe that opens into the sidewall of the rainwater basin. It is characterized by rainwater infiltration.