JP2662823B2 - Rainwater penetration structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure for infiltrating rainwater into the ground from a reservoir block provided in the middle of a gutter.

(Prior Art) Conventionally, as a rainwater infiltration structure in which rainwater permeates into the ground from a basin block arranged in the middle of a gutter, for example, it is described in Japanese Utility Model Laid-Open No. 58-171981. Things are known.

This conventional source shows a rainwater infiltration structure in which a water-permeable pipe extends from the side wall of the reservoir block to the ground.

Therefore, in this rainwater infiltration structure, the rainwater flowing into the reservoir block penetrates into the ground through the permeable pipe.

(Problems to be Solved by the Invention) However, in the conventional rainwater infiltration structure, since the infiltration into the ground using only a water-permeable pipe, the infiltration is linear and the infiltration of the rainwater spreads. However, there was a problem that the permeation range of rainwater was narrowed.

Therefore, in order to widen the rainwater penetration range, it is conceivable to form a rainwater infiltration layer in the ground, but in this case, the sediment falls from the upper stratum into the rainwater infiltration layer, causing rainwater infiltration. The problem arises that the layers are clogged.

As means for preventing clogging due to the collapse of the earth and sand into the rainwater infiltration layer, for example, as described in JP-A-59-150840, the rainwater infiltration layer, between the upper part and the stratum There is a technique for providing a water-permeable sheet.

However, although this water permeable sheet can certainly prevent the collapse of earth and sand from the upper stratum, it has literally water permeability, so that the rainwater flowing through the rainwater infiltration layer can pass between the upper stratum and the water permeable sheet. It will be distributed in.

In this way, when rainwater flows between the rainwater infiltration layer and the upper stratum, the rainwater flowing out from the rainwater infiltration layer to the upper stratum is included in the rainwater when flowing into the rainwater infiltration layer again. Fine sediment will be carried into the rainwater infiltration layer from the upper stratum, and in the long term, this sediment will cause a problem that the rainwater infiltration layer will be clogged.

This problem cannot be solved as long as rainwater flows between the rainwater infiltration layer and the formation above it, and the conventional water-permeable sheet has a problem that the rainwater infiltration layer is clogged as before. Was left.

Therefore, to repair the clogging of the rainwater infiltration layer,
It is necessary to dig up the ground with much cost, labor and time, and to rebuild the rainwater infiltration layer. Preventing the clogging of the rainwater infiltration layer is a major problem for practical use.

The present invention pays attention to the above-mentioned conventional problems, and makes it possible to widen the infiltration range, and furthermore, to completely prevent the clogging of the rainwater infiltration layer due to the sediment in the upper stratum. The challenge is to provide

(Means for Solving the Problems) In order to solve the above problems, in the rainwater infiltration structure of the present invention, a basin block disposed in the middle of the gutter and a rainwater formed in the ground in a planar shape are provided. A penetrating layer, a water pipe extending from the reservoir block and buried inside the rainwater penetrating layer, with a water inlet opening in the depth direction of the reservoir block and a water outlet opening in the rainwater penetrating layer. And an impervious layer formed between the rainwater infiltration layer and an upper stratum thereof.

(Operation) In the rainwater permeation structure of the present invention, the rainwater flowing into the reservoir block flows into the rainwater permeation layer through the water flow pipe. At this time, since the water inlet of the running water pipe is formed at a position midway in the depth direction of the basin block, dirt and earth and sand contained in the rainwater collect at the bottom of the basin block, and the rainwater penetrates into the rainwater infiltration layer. It can prevent the inflow of garbage and earth and sand.

The rainwater that has flowed from the outlet of the water pipe into the rainwater infiltration layer penetrates into the ground while propagating through the rainwater infiltration layer. Since the water supply is formed in the stormwater, it is ensured that the rainwater propagates in the stormwater permeation layer and the permeability is improved.

In addition, since the rainwater infiltration layer is formed in the ground under the surface,
The range of penetration into the ground is increased.

Therefore, the rainwater can permeate the rainwater permeation layer evenly, and can permeate the ground widely.

In addition, since an impermeable layer is formed between the rainwater infiltration layer and the upper layer, the impermeable layer prevents the collapse of earth and sand from the upper layer, and the impermeable layer prevents rainwater. Since the flow of rainwater between the infiltration layer and the upper stratum is blocked, the rainwater does not carry the sediment of the upper stratum into the rainwater infiltration layer, and the seepage of rainwater by the sediment in the upper stratum Layer clogging can be completely prevented.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

 First, the configuration of the embodiment will be described.

FIG. 1 shows a rainwater infiltration structure according to a first embodiment, in which 1 is a paved road.

In the pavement road 1, an asphalt layer 11 forming a road surface 10 is formed on an underlayer 12, and an L-shaped groove 20 is provided at the shoulder of the road, and a reservoir block 3 is provided in the middle of the L-shaped groove 20. Is provided. The road surface 10 is formed with a slight slope from the center toward both sides.

The underlayer 12 serves as a roadbed of the asphalt layer 11, and is formed by laying and compacting a crusher run under the asphalt layer 11, and
A rainwater infiltration layer 4 is formed below 12. The underlayer 12 is formed on an underlayer used in a normal road structure, for example, by forming an upper roadbed by a crusher run on a lower roadbed made of cut crushed stone or grain crushed stone to form two layers. .

The reservoir block 3 has a stepped cylindrical block having a rainwater inlet 30 formed on an upper surface, a bottom surface opened as a rainwater outlet 31, and a lower water storage portion 32 wider than an upper inflow portion 33. A lateral hole 35 is formed in the side wall 34 of the lower water storage part 32 in the depth direction.
The rainwater inlet 30 is provided with a grating cover 36.

The rainwater infiltration layer 4 is formed by crushed stones 40 (about 20 mm to 50 mm) laid in a plane on the infiltration layer 8 in the ground, and is formed over a substantially entire area under the road.

A water pipe 5 is buried inside the rainwater permeation layer 4.

The water passage pipe 5 has a number of water outlets 50 formed on the outer periphery, the water outlet 50 is opened inside the rainwater permeable layer 4, and the base end is fitted into the lateral hole 35 to form a water inlet 51. The reservoir block 3 is opened halfway in the depth direction. or,
The water inlet 31 of the water pipe 5 is covered with a filter 6 attached to the inner surface of the side wall 34. In addition, the water pipe 5
May be piped linearly or in a grid.

In addition, a concrete layer 70 as an impermeable layer is formed between the rainwater infiltration layer 4 and the underlying layer 12 as an upper layer.

The concrete layer 70 is cast in place on the rainwater infiltration layer 4, and the concrete layer 70
The landslide can be prevented from falling from the rainwater into the rainwater infiltration layer 4 and the flow of rainwater between the rainwater infiltration layer 4 and the underlayer 12 can be cut off.

 Next, the operation of the embodiment will be described.

In the rainwater infiltration structure of the present embodiment, the rainwater flowing into the reservoir block 3 from the L-shaped side groove 20 is stored in the lower water storage section 32, and when the rainwater reaches the water inlet 51 of the water pipe 5, the rainwater is filtered. The rainwater flows into the rainwater permeation layer 4 through the waterflow pipe 5 through the waterflow pipe 5. At this time, trash and earth and sand contained in the rainwater are
And is removed by the filter 6.

The rainwater that has flowed into the rainwater infiltration layer 4 from the water pipe 5 penetrates into the underground infiltration layer 8 through the rainwater infiltration layer 4. Since the water supply is formed by the pipe 5, the propagation of the rainwater in the rainwater permeation layer 4 is ensured, and the permeability is improved.

Moreover, since the rainwater infiltration layer 4 is installed in the ground in a planar shape, its permeation range is widened, and since the rainwater infiltration layer 4 is formed by the crushed stone 40, its void is large, It will propagate smoothly in the rainwater permeation layer 4.

As described above, in the present embodiment, the rainwater permeates the rainwater permeation layer 4 evenly, and the rainwater can permeate the permeation formation 8 underground in a wide area.

In addition, the rainwater infiltration layer 4 and the underlying layer
Since the concrete layer 70 as the water-impermeable layer is formed between them, the collapse of the earth and sand from the base layer 12 to the rainwater permeation layer 4 can be prevented.

When the concrete layer 70 is not provided or when a water permeable layer is provided instead of the concrete layer 70, the rainwater flowing through the rainwater infiltration layer 4 separates the rainwater from the rainwater infiltration layer 4 with the upper stratum. Will also penetrate into the underlying layer 12. As described above, when rainwater permeates into the underlayer 12, the rainwater returning from the underlayer 12 to the rainwater permeation layer 4 becomes
In the long term, the rainwater infiltration layer 4 is clogged with the soil of the underlayer 12 because the soil of the underlayer 12 is included.
There is a problem that the rainwater penetration function cannot be obtained.

On the other hand, when the water-impermeable layer is formed by the concrete layer 70 as in the present embodiment, the flow of rainwater between the rainwater permeation layer 4 and the base layer 12 is blocked by the concrete layer 70, Since the rainwater does not penetrate into the underlayer 12, the rainwater does not include the soil of the underlayer 12.

Therefore, the clogging of the rainwater permeation layer 4 due to the earth and sand of the underlayer 12 can be prevented.

Further, in this embodiment, since the bottom surface of the reservoir block 3 is opened as the rainwater outlet 31, the rainwater permeates into the ground from the rainwater outlet 31 as well.

Next, FIG. 2 shows a rainwater permeation structure of a second embodiment.

In the second embodiment, the reservoir block 3 is provided in the middle of the U-shaped groove 21, the bottom surface of the reservoir block 3 is closed, and the base end of the water pipe 5 is connected to the bottom surface of the reservoir block 3. The water inlet 51 of the water passage pipe 5 is opened halfway in the depth direction of the reservoir block 3. In addition, at the water inlet 36 of the water pipe 5,
The filter 6 is mounted.

In addition, the rainwater infiltration layer 4 and the underlying layer
A synthetic resin sheet 71 as an impermeable layer is provided therebetween.

Therefore, in the second embodiment, the rainwater flowing into the reservoir block 3 from the U-shaped groove 21 is stored in the lower water storage portion 32, and when the rainwater reaches the water inlet 51 of the water flow pipe 5, the rainwater is filtered. 6, rainwater flows into the rainwater permeable layer 4 through the water pipe 5, and penetrates into the underground seepage layer 8 through the rainwater permeable layer 4.

In addition, the collapse of the earth and sand from the underlayer 12 to the rainwater permeable layer 4 and the flow of rainwater between the rainwater permeable layer 4 and the underlayer 12 are prevented by the synthetic resin sheet 71 as the water-impermeable layer.

Since other configurations and operations are the same as those of the first embodiment, the same reference numerals are used in the drawings to omit the description.

The embodiments of the present invention have been described with reference to the drawings. However, the specific configuration of the present invention is not limited to the above embodiments.

For example, the rainwater infiltration layer may be formed of sand, chestnut stone, bota, coral (coral), or other well-drained soil other than crushed stone.

The impermeable layer is not limited to a concrete layer or a synthetic resin sheet, but may be a concrete plate, a synthetic resin plate,
A sheet or plate having no water permeability may be used.

Further, the rainwater infiltration structure of the present invention may be formed on the entire surface or part of the ground under a paved road, or formed not only under a paved road, but also on an unpaved road, a parking lot, a ground, a park, or the like. Can be formed underground.

(Effect of the Invention) As described above, in the rainwater infiltration structure of the present invention, since the rainwater inlet of the water passage pipe is opened in the middle of the reservoir block in the depth direction, the rainwater The garbage and the earth and sand contained in the pit are collected at the bottom of the reservoir block, thereby preventing the inflow of the garbage and the earth and sand into the rainwater infiltration layer.

In addition, since the water supply pipe forms a water supply inside the rainwater permeable layer, the transmission of the rainwater in the rainwater permeable layer is ensured, and the permeability is improved.

Also, since the rainwater infiltration layer is formed in the ground in a planar shape,
Although it is a rainwater infiltration structure from a narrow area called a reservoir block, the rainwater infiltration range can be made significantly wider than a conventional rainwater infiltration structure.

In addition, the problem caused by installing the rainwater infiltration layer in the ground, that is, the clogging of the rainwater infiltration layer due to the sediment in the upper layer of the rainwater infiltration layer, causes An impermeable layer is formed in the upper layer, preventing the collapse of sediment from the upper layer to the rainwater infiltration layer,
The upper layer can be prevented from being carried into the rainwater infiltration layer by rainwater. Therefore, it is possible to prevent clogging of the rainwater permeable layer caused by earth and sand in the upper formation and to obtain an effect that the permeability of the rainwater permeable layer can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rainwater infiltration structure of a first embodiment, and FIG.
The figure is a sectional view showing the rainwater permeation structure of the second embodiment. 12: Ground layer (upper layer) 20: L-shaped gutter (gutter) 3: Reservoir block 4: Rainwater infiltration layer 5: Water pipe 50: Water outlet 51: Water inlet 70: Concrete layer (impermeable layer) 21 : U-shaped side groove (side groove) 71: Synthetic resin sheet (water-impermeable layer)

Claims (1)

(57) [Claims] Claims: 1. A reservoir block disposed in the middle of a gutter, a rainwater permeable layer formed in the ground in a planar shape, and buried inside the rainwater permeable layer extending from the reservoir block. A water inlet opens in the middle of the reservoir block in the depth direction, and a water outlet opens in the rainwater infiltration layer, and a water passage is formed between the rainwater infiltration layer and the upper stratum. A permeable layer; and a rainwater infiltration structure comprising: