JPS6215343Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to an infiltration tank for infiltrating rainwater into the soil.In detail, the bottom plate of the cylindrical infiltration tank body built in the soil is deep enough that the lower end reaches the infiltration layer. This invention relates to an infiltration tank formed by connecting a plurality of outflow pipes constructed in the same manner.

Generally, when creating a relatively large-scale development of a forest or farmland as a residential area, the ground surface is covered with asphalt, concrete, etc., which reduces the amount of rainwater seeping into the ground. When it rains, the amount of rainwater discharged increases suddenly, causing flooding of rivers, etc., and there are many concerns that it may cause negative effects such as depletion of groundwater and ground subsidence.

In recent years, as a method of treating rainwater during rainfall, in addition to the sewer pipe method, a well has been constructed that reaches the underground permeation layer, and the rainwater from the rain is guided and injected into this well, and from the well it flows into the permeation layer. The so-called well method, which allows rainwater to infiltrate, or the so-called water expansion method, which allows rainwater to infiltrate into the soil from a number of infiltration pits built in the soil near the surface, has been developed.

However, the conventional well method requires time and effort to construct a well from the ground surface to the percolation layer, and is also expensive in terms of cost. However, the area where rainwater permeates is limited to the area around the well, resulting in poor rainwater permeation efficiency.

On the other hand, even with the water expansion method, a seepage pit lined with crushed stones is installed near the ground surface, and rainwater permeates into the soil from this seepage pit, so it is easy to construct, but unlike the well method, it is easy to construct. Since the structure does not directly inject rainwater into the underground percolation layer, the amount of rainwater permeating per location is small, and both this water expansion method and the well method mentioned above improve the efficiency of rainwater permeation. Development in terms of , cost reduction, etc. was strongly desired.

This invention was proposed in view of the above-mentioned circumstances.
The purpose of this system is to connect multiple outflow pipes, whose lower ends reach the infiltration layer, to the bottom of the cylindrical infiltration tank body built in the soil. It is an object of the present invention to provide an infiltration tank that can significantly increase the amount of water, improve the infiltration efficiency, and also be easy to construct and reduce costs.

The present invention will be explained below based on an embodiment shown in FIGS. 1 and 2.

The infiltration tank of the present invention has the end surfaces 1a of the divided boxes 1 formed in a cylindrical shape joined to each other, and these divided boxes 1
The upper end opening 3a is connected to the bottom plate part 1b of each of the divided boxes 1, and the lower end opening 3b is connected to the underground permeation layer 4.
The basic structure is made up of a plurality of outflow pipes 3 constructed to a depth of up to 100 cm, and a water guide pipe 5 connected to the infiltration tank main body 2 and guiding rainwater into the infiltration tank main body 2.

The divided box 1 is formed into a cylindrical shape by a bottom plate part 1b, a top plate part 1c, and both side plate parts 1d, 1d.The bottom plate part 1b is formed flat, and the top plate part 1c is curved outward in the shape of an arc. Further, the bottom plate portion 1b of the divided box 1 is formed with an outflow pipe attachment hole 6 that communicates the inside and outside of the divided box 1, and the upper end of the outflow pipe 3 is connected thereto.

In addition, in the permeation tank main body 2 of this embodiment, the openings on both sides of the divided boxes 1 that are joined to each other are covered with end plates 7, 7, and these divided boxes 1... Multiple PC steel materials 8 arranged in the connection direction...
will be integrated and constructed. Note that the top plate portion 1 of the divided box 1 located approximately in the center of this permeation tank body 2
An opening 9 communicating between the inside and outside of the divided box 1 is formed in c, and a manhole 10 is provided above the opening 9. This manhole 10
In the embodiment, one manhole is provided in the infiltration tank body 2, but if necessary, a plurality of manholes may be provided as shown in the two-dot chain line in FIG. Optional. Note that this manhole 10 may be provided integrally with the divided box 1.

The outflow pipe 3 includes two concrete pipes 11,
11 connected by concave-convex fitting and constructed in the ground. Note that this outflow pipe 3 may be constructed underground using, for example, a steel pipe.

The water pipe 5 is connected to the side of the manhole 10, and is for guiding rainwater collected in a downpipe or the like during rainfall into the infiltration tank main body 2.

Next, to explain the construction method of the permeation tank configured as described above, first, a trench is dug to install the permeation tank main body 2, and then a trench is dug to bury the outflow pipe 3 from the trench until it reaches the permeation layer 4. dig a hole,
An outflow pipe 3 is constructed within this hole. It goes without saying that a plurality of these outflow pipes 3 may be constructed so as to be located under each divided box 1.

Then, a split box 1 is placed on top of these outflow pipes 3.
The split box 1 is installed by aligning the mounting holes 6 formed in the bottom plate portion 1b of the split box 1, and the end surfaces 1a of the adjacent split boxes 1 are joined together, and the openings on both sides are covered with end plates 7, 7. The divided boxes 1 and the end plates 7, 7 are connected by a prestressed steel material 8, and the prestressed steel material 8 is tensed to introduce prestress into the divided box 1.

Finally, the manhole 10 is attached and backfilled, and the water pipe 5 is connected to the side of the manhole 10.

In addition, the connection of the split box 1 may be performed by providing a joint hardware on the end face 1a of the split box 1, and connecting the split boxes 1 using the joint hardware.

Next, the operation of the infiltration tank of the present invention will be explained.

During rainfall, rainwater collected in downpipes, etc.
It is injected into the osmosis tank main body 2 through the water conduit 5 and discharged from the osmosis tank main body 2 into the plurality of outflow pipes 3 . The rainwater discharged into the outflow pipe 3 sequentially permeates into the underground permeation layer 4 through the lower end opening 3b. Therefore, the rainwater injected into the infiltration tank main body 2 permeates into the permeation layer 4 over a wide area via the plurality of outflow pipes 3, so that the rainwater permeation efficiency becomes good.

Moreover, with the infiltration tank having such a configuration, for example, if you want to increase the amount of rainwater infiltration, all you have to do is connect the divided boxes 1 further and increase the length of the infiltration tank main body 2, so you can use the conventional well method. There is no need to construct a new well in order to increase the amount of seepage, and it is also possible to easily construct a longer length of the seepage tank body 2, so costs can be reduced. can. That is, to construct the permeation tank, as described above, a trench can be dug, and the outflow pipe 3 can be constructed from above the trench in the soil using the concrete pipe 11, and the divided boxes 1 can be joined one after another. This makes work on site easier.

In addition, in this embodiment, the top plate portion 1c of the divided box 1 is formed into an outwardly curved arc plate shape, so that it has high strength against vertical loads such as earth pressure. Since there is no need to increase the strength by increasing the wall thickness, the divided box 1 can be manufactured at low cost. Note that the cross-sectional shape of the divided box 1 is not limited to that of this embodiment, and may be, for example, a square cylindrical box culvert.

As explained above, the permeation tank of the present invention includes a permeation tank main body formed by joining the end faces of cylindrical divided boxes to each other and connecting these divided boxes together, and a bottom plate of each of the divided boxes. a plurality of outflow pipes each having an upper end opening connected to the infiltration tank body and a lower end opening constructed deep enough to reach an underground permeation layer; and a water conduit pipe connected to the infiltration tank body and guiding rainwater into the infiltration tank main body. Since it consists of these, it has excellent effects such as being able to increase the permeation efficiency of rainwater, and also making it relatively easy to construct a permeation tank and reducing costs.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line of FIG. 1. DESCRIPTION OF SYMBOLS 1... Divided box, 1a... End surface, 1b... Bottom plate part, 1c... Top plate part, 1d... Side plate part, 2... Penetration tank body, 3... Outflow pipe, 3a... Top opening Department,
3b... lower end opening, 4... permeation layer, 5... water pipe, 8... PC steel material, 10... manhole, 11
...Concrete pipe.

Claims (1)

[Scope of utility model registration request] An infiltration tank body formed by joining together the end faces of a divided box formed into a cylindrical shape by a bottom plate, a top plate, and both side plates, and connecting these divided boxes together;
A plurality of outflow pipes each having an upper end opening connected to the bottom plate of each of the divided boxes and a lower end opening reaching a depth reaching an underground permeation layer, and a permeation tank connected to the permeation tank body to drain rainwater. An infiltration tank consisting of a water conduit that leads into the main body.