JP3181823B2 - Drainage with water permeability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage groove having water permeability used for a side groove of a road or a sidewalk.

[0002]

2. Description of the Related Art Drains such as gutters on roads in urban areas are shown in FIG.
Usually, it is formed by an L-shaped block 11 made of non-permeable concrete as shown in FIG. 4 or a U-shaped tube 12 made of non-permeable concrete as shown in FIG. And rainwater is collected through these impervious drains into the sump. However, in such a conventional structure, since the rainwater is hardly returned to the ground, the ground becomes dry and causes a heat island phenomenon in an urban area. In addition, with such a conventional structure, during rainfall, a large amount of rainwater concentrates on the drainage basin, so that the drainage basin overflows and causes flood damage, and the processing capacity of the sewage treatment equipment cannot catch up. I have.

[0003] Therefore, attempts have been made to prevent flood damage and improve the urban environment by making the drainage permeable so that rainwater can penetrate into the ground by making the drainage permeable. is there. However, since the rainwater from many drains concentrates on this permeable pit, its ability to return rainwater into the ground is extremely small.

Accordingly, as shown in FIG. 5, a drainage channel itself having water permeability is also used. 5 has a structure in which a subgrade is dug down to a depth of several tens of centimeters to bury a permeable U-shaped tube 13 and a permeable L-shaped block 14 is placed on the upper surface of the permeable U-shaped tube 13. belongs to. However, in the structure shown in FIG. 5, since the water-permeable L-shaped block 14 made of a porous material having low mechanical strength is mounted on the water-permeable U-shaped tube 13, the structure is slightly weak against a load from above, and However, there is a problem in that it lacks durability in places where the vehicle runs. There is also a problem that when a large amount of rainwater flows in, sufficient water permeability cannot be exhibited.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, is resistant to a load from above, has excellent durability, and has a greater ability to reduce rainwater into the ground than the conventional structure shown in FIG. The purpose of the present invention is to provide a drain having excellent water permeability.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a crushed stone layer formed by filling a crushed stone into a groove dug down in a subgrade of a side gutter of a road. Inside the layer, a perforated pipe with a number of holes penetrating rainwater that penetrates the crushed stone layer penetrating the upper half of the outer periphery is connected in the longitudinal direction of the groove.
Buried continue to, a culvert flowing inside the water, the perforated
In addition to guiding water flowing inside the pipe to the permeable wall, the permeable block is entirely supported and installed on the crushed stone layer via a permeable sheet and a sand layer. . Note that a structure in which a perforated pipe is buried below the center of the crushed stone layer is preferable. It is preferable that the crushed stone layer is made of crushed stone having a uniform particle size.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment shows an example in which a curb 2 portion of a sidewalk 1 is formed as a drainage groove having water permeability. First, as shown in FIG.
The groove 3 is formed by digging down to a depth of about 30 to 50 cm, and the inside of the groove 3 is filled with crushed stone 4 having a uniform grain size. The crushed stone 4 having a uniform particle size is generally called a single crushed stone, and it is preferable that the crushed stone 4 has a particle size in a range of about 30 to 50 mm and a variation in the particle size is as small as possible. This is because if the variation in the particle size is large, the large-diameter crushed stones 4 fill the space between the large-diameter crushed stones 4 and the water permeability decreases.

A crushed stone layer composed of crushed stones 4 having a uniform grain size is formed in this way, and a perforated pipe 5 is buried therein to form a culvert. The perforated pipe 5 has a large number of holes formed in the upper half of a vinyl chloride pipe having a diameter of, for example, about 20 cm, and is continuous in the longitudinal direction of the groove 3. If an air chamber is provided inside the crushed stone layer by this perforated pipe 5,
In addition to the effect of inviting water, drainage from the gaps between the crushed stones 4 is improved, and an effect as a culvert through which water flows inside the perforated pipe 5 can be expected. Since the effect of improving the drainage is greater when the perforated pipe 5 is at the bottom than at the top of the crushed stone layer, the perforated pipe 5 should be buried below the center of the crushed stone layer. Is preferred.

Above the crushed stone layer, a water-permeable block 8 is provided via a water-permeable sheet 6 and a sand layer 7. As the water permeable block 8, a porous ceramic material in which ceramic particles are bonded by an inorganic binder can be used, or another water permeable material such as a porous concrete material may be used. The shape may be an L-shaped block or the like in addition to the one shown in the figure. The use of ceramic particles obtained by mixing a pigment with a ceramic raw material and firing the same enables permanent coloring and gives a different aesthetic appearance from the conventional monotonous gray concrete.

The sand layer 7 is for stably fixing the water permeable block 8, and the water permeable sheet 6 is made of a nonwoven fabric or the like for preventing the sand from flowing out.
For the sand layer 7 and the water-permeable sheet 6, a leveling mortar in which sand is mixed with cement 1 at a ratio of 3 and kneaded without adding water can be used. This leveling mortar hardens when water is applied after construction, and forms a water-permeable support layer.

In the drainage groove having water permeability according to the present invention configured as described above, the lower surface of the water-permeable block 8 has a sand layer 7,
Since the entire surface is supported by the water permeable sheet 6 and the crushed stone layer, the water permeable block 8 is not likely to be damaged even if a load is applied from above, and excellent durability can be exhibited.

The rainwater penetrates the permeable block 8 and penetrates the crushed stone layer, and further diffuses into the surrounding ground. The perforated pipe 5 embedded in the crushed stone layer forms water. Since the invocation is promoted, a large amount of rainwater can quickly flow into the crushed stone layer. A part of the water flows into the perforated pipe 5, flows through the perforated pipe 5, and is permeated and reduced to the ground. Therefore, the water-permeable drainage of the present invention,
It is superior to the conventional structure of FIG. 5 in the ability to return rainwater to the ground.

[0013]

As described above, the water-permeable drainage of the present invention is excellent in durability and the ability to return rainwater to the ground, and the inflow of rainwater into sewers and rivers during rainfall. It is effective in reducing the volume and preventing urban flooding. It is also effective in improving underground living systems by returning rainwater to the ground, contributing to tree recharge, and preventing urban heat island phenomena in summer due to evaporation of ground water. Furthermore, if you use it considering the color of the water-permeable block,
It can also contribute to improving the beauty of the environment.

[Brief description of the drawings]

FIG. 1 is a sectional view of a drainage groove having water permeability according to the present invention.

FIG. 2 is a perspective view showing a construction example of a drainage groove having water permeability according to the present invention.

FIG. 3 is a sectional view of a drainage ditch using a conventional L-shaped block.

FIG. 4 is a sectional view of a drainage ditch using a conventional U-shaped pipe.

FIG. 5 is a sectional view of a drainage ditch using a conventional water-permeable block.

[Explanation of symbols]

1 sidewalk, 2 curbs, 3 grooves, 4 crushed stones, 5 perforated pipes,
6 permeable sheet, 7 sand layer, 8 permeable block, 11
Conventional L-shaped block made of concrete without water permeability,
12 Conventional non-permeable concrete U-tube, 13
Water-permeable U-shaped tube, 14 water-permeable L-shaped block

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01C 11/22 E03F 1/00 E03F 5/04

Claims (3)

(57) [Claims] 1. A filled with crushed stone to form a crushed stone layer in the trench by digging down the subgrade gutter portion of the road, inside the crushed stone layer, the outer periphery a large number of holes to attract rainwater to penetrate the crushed stone layer
Internal perforated tube with Toru設the upper half and <br/> set embedded continuously in the longitudinal grooves of the inner and underdrain of running water, the perforated pipe
Together shall lead to permeability increase the water flow through the drainage groove having a water permeability, characterized in that on top of the crushed stone layer through the water permeable sheet and laying sand were placed permeable blocks fully support . 2. The drainage groove having water permeability according to claim 1, wherein a perforated pipe is buried below the center of the crushed stone layer. 3. The drainage groove having water permeability according to claim 1, wherein the crushed stone layer is made of crushed stone having a uniform particle size.