JPS636295Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field] The present invention relates to a rainwater underground infiltration device.

[Prior art] In recent years, in order to prevent urban flood damage caused by rainwater and to prevent a drop in groundwater level, permeable pipes with openings formed in the pipe peripheral wall and water permeable pipes installed around the permeable pipes have been developed. An underground rainwater infiltration device has been proposed in which a rainwater infiltration layer is buried underground. here,
The permeation layer consists of a crushed stone filter, etc. wrapped in a permeable sheet, and is used to filter sludge present in rainwater flowing out from the permeable pipe, expand the permeation/diffusion area from the permeable pipe into the soil, and prevent water from entering the inside of the permeable pipe. Efforts are being made to prevent the infiltration of surrounding soil.

However, the permeable pipes used in the above-mentioned conventional rainwater underground infiltration equipment become clogged with sediment in the permeable layer over a long period of use, gradually decreasing their filtration performance and infiltration and diffusion performance. It is necessary to replace the line every time it is overused.

[Purpose of the invention] The purpose of the invention is to provide a rainwater underground infiltration device that can maintain stable filtration performance and permeation/diffusion performance over a long period of time.

[Summary of the invention] In order to achieve the above object, the present invention is a rainwater underground infiltration device buried underground, which includes a water permeable pipe with an opening formed in the pipe peripheral wall, and a water permeable pipe arranged around the water permeable pipe. The cleaning pipe includes a permeable layer, a cleaning pipe that jets pressure water to the permeable layer, and a drain pipe that sucks the pressure water jetted from the cleaning pipe.

[Structure of the invention] Hereinafter, embodiments of the invention will be described with reference to the drawings.

1 and 2 show a rainwater underground infiltration device according to an embodiment of the present invention, and a rainwater basin 11 includes:
A vertical pipe 13 is connected through the horizontal pipe 12, and the vertical pipe 1
A water permeable pipe 14 is connected to the lower part of the pipe 3. The permeable pipe 14 is covered by a permeable layer 15 .
A through hole 16 is provided in the upper part of the horizontal pipe 12 that opens to the ground surface.
A lid 17 is attached, and the bottom of the horizontal pipe 12 is a mud basin 18. Moreover, a sewer pipe 19 can be connected to the lower part of the horizontal pipe 12.

A lid 20 is installed at the top of the vertical pipe 13 that opens to the ground surface.
is installed inside the vertical pipe 13 on the downstream side of the connection part of the horizontal pipe 12 as a primary filter.
A filter (not shown) that can filter out sludge and impurities in rainwater flowing from the rainwater basin 11 toward the permeable pipe 14 can be arranged. Note that the filter serving as the primary filter can be pulled out to the ground surface from the upper opening of the vertical pipe 13.

The water permeable pipe 14 is provided with a large number of openings 21 that open to the inner and outer surfaces of the pipe at a large number of positions on its peripheral wall.
It is possible for rainwater that has flowed in to permeate and diffuse toward the permeable layer 15. Further, the permeable layer 15 is constructed by covering the crushed stone filter 22 with a water-permeable sheet 23. The water-permeable sheet 23 may be made of a synthetic resin or metal sheet, and the crushed stone filter 22 may be made of synthetic resin Raschig rings.

Therefore, in this embodiment, the permeation layer 15
A spiral cleaning pipe 24 with the water permeable pipe 14 as its central axis is disposed inside the crushed rock filter 22 which is disposed around the water permeable pipe 14. The cleaning pipe 24 has one end connecting portion 24A raised to the ground surface, and a pressure water supply pipe can be connected to the connecting portion 24A, and a spiral portion located inside the permeation layer 15 has a large number of small diameters. hole 2
4B, so that pressure water can be ejected to the permeation layer 15.

In addition, at the bottom of the permeable layer 15, that is, at the boundary between the permeable sheet 23 and the surrounding soil, a well-shaped drainage pipe 2 is provided.
5 are installed. The drain pipe 25 has one end connecting portion 25A raised up to the ground surface, and the connecting portion 25A
A vacuum suction pipe can be connected to the permeation layer 15, and a large number of small-diameter holes 25B are provided in the column-shaped portion located at the bottom of the permeation layer 15, so that the pressure water spouted from the cleaning pipe 24 can be sucked.

Note that the cleaning pipe 24 may be arranged not only inside the permeable layer 15 but also at the boundary between the permeable layer 15 and the surrounding soil, and may be arranged not in a spiral shape but in a parallel or loop shape. Good too. In addition, the drain pipe 2
5 is not only the bottom of the permeation layer 15, but also 2 in FIG.
As shown by the dotted chain line, it may be arranged inside the permeation layer 15, and it may be arranged in a spiral shape or a loop shape instead of a parallel cross shape.

Next, the operation of the above embodiment will be explained.

When rainwater is introduced from the rainwater basin 11 into the permeable pipe 14, the introduced rainwater flows through the opening 2.
1. After passing through the permeable layer 15 and being filtered in the permeable layer 15, it permeates and diffuses into the soil surrounding the permeable layer 15.

As the permeable layer 15 repeats the above-mentioned filtration action and permeation-diffusion action, the accumulation of earth and sand gradually increases inside the permeation layer 15, and the above-mentioned filtration action and permeation-diffusion action continue to be repeated. For example, there is a possibility that the permeation layer 15 becomes clogged. Therefore, in the rainwater underground infiltration device, a pressure water supply pipe is connected to the connection part 24A of the cleaning pipe 24 at regular intervals before the permeation layer 15 becomes clogged. Pressure water is ejected from 24B into the inside of the permeation layer 15 to stir and wash the accumulated earth and sand inside the permeation layer 15. At the same time, by connecting a vacuum suction pipe to the connection part 25A of the drain pipe 25, the accumulated sediment stirred by the pressure water is transferred to the hole 25 of the drain pipe 25 together with the pressure water.
It is sucked in from 5B and discharged to the ground.

That is, according to the above embodiment, after each use of the rainwater underground infiltration device for a certain period of time, pressure water is ejected to the infiltration layer 15 through the cleaning pipe 24, and the infiltration layer 15 is agitated by the pressure water. By suctioning the accumulated earth and sand together with pressure water through the drain pipe 25, stable filtration performance and permeation diffusion performance without clogging of the permeable layer 15 can be achieved without having to replace the permeable pipe 14 and the permeable layer 15. It can be secured permanently. Moreover, this makes it possible to improve the durability of the rainwater underground infiltration device and reduce maintenance work.

[Effects of the invention] As described above, the present invention provides a rainwater underground infiltration device buried underground. a cleaning pipe that sprays pressurized water onto the permeation layer;
It has a drain pipe that sucks the pressure water ejected from the cleaning pipe. Therefore, it is possible to reliably remove the accumulated sediment in the permeable layer and maintain stable filtration performance and permeation/diffusion performance over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a rainwater underground infiltration device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1. 14... Permeable pipe, 15... Permeable layer, 24... Cleaning pipe, 25... Drain pipe.

Claims (1)

[Scope of utility model registration request] In rainwater underground infiltration equipment buried underground,
A permeable pipe with an opening formed in the peripheral wall of the pipe, a permeable layer placed around the permeable pipe, a cleaning pipe that spouts pressurized water into the permeable layer, and a drainage pipe that sucks the pressurized water spouted from the cleaning pipe. A rainwater underground infiltration device comprising a pipe.