JP2000001899A - Catch basin for underground water penetration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catch basin for underground water penetration which is capable of penetrating rain water underground effectively by conquering any decrease in rain water penetration due to deposition of sediment in the catch basin without necessitating frequent removal of sediment thereby making the maintenance control easier with excellent rain water permeability. SOLUTION: This catch basin has a settling chamber 10 and an overflow water penetration chamber 11, and the overflow water penetration chamber 11 has a two-stage construction with an upper filter chamber and a lower penetration chamber. Then, sediment in rain water flowing from a side ditch to a catch basin 1 for underground water penetration is settled in the settling chamber 10, upper water overflows to the penetration chamber 11, sediment in the overflow water is further removed when water passes through a sand removal sheet 18 provided in a filter chamber 14, and water flows into the penetration chamber and then penetrates from its bottom opening to the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground seepage measure, particularly to an underground seepage measure arranged so as to be connected to a gutter so that rainwater flowing through the gutter can penetrate underground.

[0002]

2. Description of the Related Art In recent years, with the improvement of the pavement rate of a road surface or the like, rainwater that has rained on the road surface or the like flows into a gutter provided on the side of a road without penetrating into the underground, and most of the rainwater flows through the gutter. It is flowing into the sea. For this reason, the penetration rate of rainwater into the ground has decreased, and land subsidence due to pumping of groundwater and environmental degradation due to depletion of groundwater have become apparent, and it has been required to effectively infiltrate rainwater into the underground. As a solution to this, there is known an underground seepage measure installed at predetermined intervals in a gutter so that a part of the rainwater flowing in the gutter penetrates underground at the underground seepage measure. Conventionally known underground infiltration basins include those in which there is no bottom wall of the basin and the ground surface is directly exposed at the bottom of the basin, or those in which a hole is formed in the bottom wall or the entire peripheral wall, and rainwater flowing into the basin is provided. Penetrates directly into the basement or through holes formed in the bottom wall or the peripheral wall.

[0003]

However, in the above-mentioned conventional underground seepage pit, the sediment flowing into the ditch together with the rainwater settles in the pit, and a large amount of sediment is deposited in the pit in a short period of time. However, there is a disadvantage in that the permeation capacity of the permeate is reduced and the function as a permeation box is no longer achieved. In order to maintain the function as an infiltration basin, accumulated sediment should be removed frequently, but there are problems such as difficulty in maintenance and management. It is a fact.

The present invention has been made in view of the above circumstances, and is an underground infiltration basin provided in communication with a gutter, which is effective in overcoming a decrease in rainwater infiltration due to accumulation of sediment in the pit. It is an object of the present invention to provide an underground seepage measure which can easily infiltrate rainwater into the underground, does not require frequent removal of earth and sand, is easy to maintain, and has excellent rainwater permeability.

[0005]

The underground seepage measure of the present invention which solves the above-mentioned problems is an underground seepage measure connected to a gutter and provided with a sedimentation tank and flowing water overflowing from the sedimentation tank. It is characterized by having an overflow water seepage tank that seeps into the ground. The overflow water infiltration tank has an upper and lower two-stage structure including a filter tank at an upper part and a permeation tank at a lower part, and the filter tank is provided with a filter support part for supporting a filter for removing soil and sand, and the permeation tank has a bottom part. It is desirable to have a water flow structure including openings or water holes.

The filter provided in the filter tank is supported by supporting the surface of the filter or the surface of the filter holder such that the surface substantially coincides with the flowing water surface at the bottom of the gutter.
Since earth and sand, dust and the like adhering to the filter surface are washed away by the force of the running water, the interval between cleanings of the filter tank can be lengthened, which is more preferable. In addition, the bottom of the sedimentation tank has a water passage structure including a front opening or a large number of water holes, so that rainwater permeates the underground from the sedimentation tank and promotes dehydration from sediment deposited in the sedimentation tank. This makes it easier to remove earth and sand during cleaning.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an underground seepage measure according to an embodiment of the present invention. The underground seepage measure 1 of this embodiment is installed at appropriate intervals between the gutters, has side walls 2 on both sides continuous with the gutters, and has an upstream end wall 4 and a downstream end wall provided between the side walls. 5 is formed at a position lower than the side wall top surface so that the top end surfaces 6, 7 are located at substantially the same depth position as the bottom wall surface of the gutter (that is, the water channel surface). Has formed. Further, a sedimentation tank 10 and an overflow water permeation tank 11 formed downstream of the sedimentation layer are provided between the inflow port and the outflow port.

[0008] The sedimentation tank 10 is formed with an arbitrary number of water holes 12 having an appropriate size at the bottom thereof, so that water flowing into the sedimentation tank together with earth and sand can permeate underground through the holes. Thereby, even if the sediment accumulates in the sedimentation tank and causes clogging, when the running water runs out, the water contained in the sediment gradually penetrates into the underground through the holes, and dewaters and dries the sediment. To facilitate the removal of sediment during maintenance work. Instead of forming a water hole in the bottom wall of the settling tank, the entire bottom wall may be eliminated and the bottom of the settling tank may be directly exposed to the ground. Further, since the main purpose of the sedimentation tank is to sediment the earth and sand, it is not desirable, but the sedimentation tank can be provided without necessarily having a water hole.

The overflow water infiltration tank 11 is provided through an overflow wall 13 provided on the downstream side of the sedimentation tank, and is configured so that water overflowing from the sedimentation tank 10 flows in. Faces. Since the water removed by sedimentation in the sedimentation tank overflows and flows into the overflow water infiltration tank 11 from above, the inflow of sediment into the overflow water infiltration tank 11 is small, and the sediment in the sedimentation tank is reduced. Although it is unlikely that the sedimentation capacity is reduced by accumulation, the rainwater flowing into the overflow water infiltration tank 11 is further filtered to remove fine sediment and dirt in order to further enhance the permeation ability in the present embodiment. To prevent clogging in the infiltration part.

[0010] For this purpose, the overflow water infiltration tank 11 of the present embodiment, as clearly shown in FIG.
The upper stage is a filter tank 14, and the lower stage is a permeation tank 15. A filter support plate 17 having a number of water holes 16 is provided between the filter tank 14 and the permeation tank 15.
Is provided. On the upper surface of the filter support plate, a commercially available sandproof sheet 18 as a filter is detachably mounted. In order to prevent the sand-prevention sheet from flowing out, an appropriate sand-prevention sheet press (filter press) 19 that does not impede the passage of water is placed on the upper part thereof.
Also, in the infiltration tank 15, if necessary,
And porous concrete. In the case of porous concrete or the like, it is easy to maintain and manage if it is formed in a cassette type so that it can be appropriately inserted into and removed from the sedimentation tank, and is periodically taken out and washed.

The depth of the filter tank 14 is set so that the surface of the sand-proof sheet holding surface or the top surface of the sand-proof sheet placed in the filter tank is at the same level as the overflow wall 13, that is, the channel surface. Thus, it is desirable that the flowing water passing through the surface forms a continuous flow without being blocked. As a result, dust and the like adhering to the surface of the sandproof sheet or the surface of the sandproof sheet retainer 19 are washed away by the force of the running water, thereby effectively preventing clogging of the sandproof sheet, extending the interval between cleaning and replacement of the sandproof sheet, and performing maintenance. Can be saved.

The underground seepage pit of this embodiment is configured as described above. As shown in FIG. 2, the sedimentation tank 10 is installed in series between the side grooves 25 so as to be on the upstream side. The 26 end faces are arranged so that the top end faces 6 and 7 of the upstream end wall 4 and the downstream end wall 5 of the underground seepage measure 1 coincide. Thus, rainwater flowing from the upstream gutter 25 mixed with earth and sand flows into the sedimentation tank 10 of the underground seepage pit 1 and is stored. When the sedimentation tank is full, it overflows from the overflow wall 13 on the downstream side. It reaches the overflow water penetration tank 11. At this time, the sediment that flows in with the rainwater precipitates and accumulates in the sedimentation tank while the rainwater reaches the overflow wall from the upstream end wall of the sedimentation tank.

As described above, the rainwater flowing into the overflow water infiltration tank is reduced in the amount of sediment mixed in with the sedimentation tank by passing through the sedimentation tank. Is removed, and the permeation tank 15 is passed through the water holes 16 of the filter support plate.
It flows into the interior and penetrates into the ground from the bottom opening through the rubble stone, gravel, etc., which are filled therein. On the other hand, the water flow exceeding the permeation capacity of the overflow water permeation tank flows through the upper surface of the sandproof sheet of the filter tank, passes through the top end face 7 of the downstream end wall 5, and flows to the downstream side groove 25.

As described above, the rainwater reaching the infiltration tank 15 is
Since the sediment has been removed, the sediment can be satisfactorily penetrated into the underground without clogging due to sediment accumulation or sediment in the infiltration tank, and the conventional problems can be solved.
Moreover, since the rainwater is arranged to flow on the surface of the sand-proof sheet or the surface of the sand-proof press, dust attached to the surface of the sand-proof sheet or the surface of the sand-proof press is washed away by the running water when the amount of flowing water increases, so the sand-proof sheet Does not easily clog. Therefore, there is no need to clean or replace the sandproof sheet for a long period of time, and maintenance and management are easy and economical.

As described above, one embodiment of the underground seepage measure according to the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various design changes can be made within the technical idea. For example, the above embodiment shows a case where the gutter is applied to an open type without a lid, but when applied to a gutter with a lid, the underground infiltration tank is also configured to cover the upper end of the side wall and support the lid. I do. Further, in the above-described embodiment, the case is arranged in series in the side groove. However, for example, it can be provided in parallel on one side of the side groove. In that case, the underground infiltration basin is configured so that the sedimentation tank and overflow water infiltration tank are arranged in the order close to the side wall of the gutter. Rainwater flows into
It is also possible for it to overflow and penetrate the overflow water infiltration tank.

In the above embodiment, the overflow water infiltration tank is divided into a filter tank and an infiltration tank, but it is not always necessary. A filter may be mounted thereon. Further, the overflow water permeation tank may not be filled with anything, and an empty permeation tank similar to the settling tank may be simply connected. Further, in the above embodiment, the tank is formed in the two tanks of the settling tank and the overflow water permeation tank, but is not necessarily limited to the two tanks, and is formed in a plurality of tanks of three or more tanks so that the water overflows and flows in order. May be. In that case, sedimentation of the earth and sand decreases in order from the upstream side to the downstream side, and the underground permeability of rainwater on the downstream side can be favorably maintained for a long period of time.

[0017]

The underground seepage measure of the present invention according to claims 1 to 4 is constructed as described above, and effectively prevents rainwater from penetrating into the underground by overcoming a decrease in rainwater seepage due to accumulation of sediment in the measure. It can penetrate, does not need to frequently remove earth and sand, is easy to maintain, and has excellent rainwater permeability.

According to a second aspect of the present invention, in the underground seepage pit, the overflow water infiltration tank is formed in a two-stage structure of a filter tank and an infiltration tank. , The permeation capacity of rainwater in the sedimentation tank can be maintained for a long time.

Further, according to the third aspect of the present invention, since soil, dirt, and the like adhering to the filter surface provided in the filter tank are washed away by the force of flowing water, the cleaning interval of the filter tank can be made longer. . According to the configuration of claim 4, since the bottom of the sedimentation tank has a water-permeable structure, rainwater permeates the underground from the sedimentation tank and dehydration from the sediment deposited in the sedimentation tank is promoted, Removal of earth and sand during cleaning is facilitated. It is also possible for the water to enter and overflow and infiltrate the overflow water infiltration tank. Further, in the above embodiment, the overflow water permeation tank is divided into a filter tank and a permeation tank, but it is not always necessary. A filter may be mounted. Furthermore, an empty settling tank similar to the settling tank may be simply connected without filling the settling tank with anything.

[Brief description of the drawings]

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

FIG. 2 is a front sectional view thereof.

FIG. 3 is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground seepage measure 2 Side wall 4 Upstream end wall 5 Downstream end wall 10 Sedimentation tank 11 Overflow water infiltration tank 12, 16 Water passage hole 13 Overflow wall 14 Filter tank 15 Water-permeable membrane 17 Filter support plate 18 Sandproof sheet 19 Sandproof sheet holder 20 Kuriishi

Continuation of the front page (72) Inventor Kenji Ishu 1839-1 Kombu, Gushikawa-shi, Okinawa Daiwa Concrete Industry Co., Ltd. F term (reference) 2D063 AA14 DA04 DB04

Claims (4)

[Claims] 1. An underground infiltration tank provided in series with a gutter, comprising: a sedimentation tank; and an overflow water infiltration tank into which flowing water flowing from the sedimentation tank flows and permeates into the ground. Underground seepage measure. 2. The overflow water infiltration tank has an upper and lower two-stage structure including a filter tank at an upper part and a permeation tank at a lower part, and the filter tank is provided with a filter supporting part for supporting a filter for removing soil and sand. 2. The groundwater infiltration basin according to claim 1, wherein the infiltration tank has a water flow structure having an opening or a water flow hole at a bottom. 3. The underground seepage filter according to claim 2, wherein the filter is supported such that a surface of a filter provided in the filter tank or a surface of the filter retainer substantially coincides with a flowing water surface at the bottom of the gutter. Masu. 4. The underground infiltration tank according to claim 1, wherein the sedimentation tank has a water passage structure having an opening or a water passage hole at a bottom portion.