JPH09177016A - Water permeable drain - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a drainage channel having excellent water permeability and excellent durability and ability to return rainwater to the ground. SOLUTION: A crushed stone 4 having a uniform grain size of about 30 to 50 mm is filled in a groove obtained by digging a roadbed by several tens of centimeters to form a crushed stone layer, and a perforated pipe 5 is preferably provided in a lower position inside the crushed stone layer. It is buried and used as a culvert. Then, the water permeable block 8 is placed on the crushed stone layer with the water permeable sheet 6 and the sand layer 7 interposed therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeable drainage groove used for a side groove portion of a roadway or a sidewalk.

[0002]

2. Description of the Related Art Drains such as gutters on roads in urban areas are shown in FIG.
It is usually formed by a concrete impermeable L-shaped block 11 as shown in FIG. 4 or a concrete impermeable U-shaped tube 12 as shown in FIG. Rainwater is then collected in drainage basins through these impermeable drains. However, with such a conventional structure, rainwater is hardly returned to the ground, which causes the ground to dry and cause a heat island phenomenon in urban areas. In addition, with such a conventional structure, a large amount of rainwater concentrates on the drainage basin during rainfall, but the drainage spill overflows and causes water damage, and the treatment capacity of the sewage treatment equipment cannot keep up. There is.

Therefore, attempts have been made to prevent water damage and improve the urban environment by making the drainage channels permeable, and there has been an attempt to allow rainwater to penetrate into the ground as a permeable drainage. is there. However, since the rainwater from many drains concentrates on this permeable trough, its ability to return rainwater to the ground is extremely small.

Therefore, as shown in FIG. 5, a drainage groove itself having water permeability is also used. The drainage ditch of FIG. 5 has a structure in which a water-permeable U-shaped tube 13 is buried by digging the roadbed to a depth of several tens of cm, and a water-permeable L-shaped block 14 is placed on the upper surface of this water-permeable U-shaped tube 13. belongs to. However, in the structure of FIG. 5, since the water-permeable L-shaped block 14 made of a material having a low mechanical strength is placed on the water-permeable U-shaped tube 13, it is slightly vulnerable to the load from above, There is a problem that durability is poor in a place where the car runs. There is also a problem that sufficient permeation performance cannot be exhibited when a large amount of rainwater flows in.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and is more resistant to the load from above and more durable, and has a lower ability to return rainwater to the ground than the conventional structure of FIG. The purpose is to provide a drainage channel having excellent water permeability.

[0006]

DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, has a method in which a crushed stone layer is formed by filling crushed stones inside a groove in which a subgrade is dug, and inside the crushed stone layer. It is characterized in that a hole pipe is buried and a water permeable block is installed on the crushed stone layer through a water permeable sheet and a sand layer. A structure in which a perforated pipe is buried below the center of the crushed stone layer is preferable. Further, it is preferable that the crushed stone layer is composed of single-grain crushed stones having a uniform grain size.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to FIGS. This embodiment shows an example in which the curb 2 of the sidewalk 1 is a drainage channel having water permeability, and as shown in FIG.
A 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 grain size is commonly called a single grain crushed stone, and it is preferable that the crushed stone 4 has a grain size within a range of about 30 to 50 mm and has a variation in grain size as small as possible. This is because if the variation in particle size is large, the small-sized crushed stones 4 are filled between the large-sized crushed stones 4 and 4, and the water permeability is reduced.

In this way, a crushed stone layer composed of crushed stones 4 having a uniform grain size is formed, and a perforated pipe 5 is embedded in the crushed stone layer to form a culvert. The perforated pipe 5 is, for example, a vinyl chloride pipe having a diameter of about 20 cm and a large number of holes formed in the upper half thereof, 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,
It is possible to expect an effect as a culvert where water flows through the inside of the perforated pipe 5 while the water is drawn in from the gap of the crushed stone 4 by the effect of attracting water. Since the effect of improving such water drainage is greater when the perforated pipe 5 is located below the crushed stone layer than above it, 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 installed 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 bound by an inorganic binder can be used, or another water permeable material such as a porous concrete material may be used. Further, the shape thereof may be an L-shaped block or the like other than that shown in the drawing. By using ceramic particles obtained by mixing a ceramic raw material with a pigment and firing the pigment, permanent coloring is possible and an appearance different from that of conventional monotonous gray concrete can be provided.

The spread sand layer 7 is for stably fixing the water permeable block 8, and the water permeable sheet 6 is made of a non-woven fabric or the like for preventing the spread sand from flowing out.
For the portions of the spread sand layer 7 and the water permeable sheet 6, it is possible to use a leveling mortar in which sand is mixed with cement 1 in a ratio of 3 and kneaded without adding water. This leveled mortar hardens when water is applied after construction and forms a water-permeable support layer.

In the water-permeable drainage groove of the present invention having the above-described structure, the lower surface of the water-permeable block 8 is the sand layer 7,
Since it is entirely supported by the water permeable sheet 6 and the crushed stone layer, the water permeable block 8 will not be damaged even if a load is applied from above, and excellent durability can be exhibited.

Further, rainwater permeates through the water-permeable block 8 and permeates into the crushed stone layer, and further diffuses into the surrounding ground. However, the perforated pipe 5 buried inside the crushed stone layer causes water to pass through. Since it invites a large amount of rainwater, a large amount of rainwater can quickly flow into the crushed stone layer. Further, a part thereof flows into the inside of the perforated pipe 5, flows through the inside of the perforated pipe 5, and permeates to be returned to the ground. Therefore, the drainage ditch having water permeability 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 drain of the present invention is excellent in durability and ability to return rainwater to the ground, and rainwater flows into sewers or rivers during rainfall. It is effective in reducing the amount and preventing urban floods. It is also effective in improving the biological system in the ground by returning rainwater to the ground, helping to recharge the trees, and preventing the heat island phenomenon in the city in summer due to evaporation of water in the ground. Furthermore, if the color of the water-permeable block is taken into consideration,
It can also contribute to improving the aesthetics of the environment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a water-permeable drainage groove of the present invention.

FIG. 2 is a perspective view showing an example of construction of a water-permeable drainage groove of the present invention.

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

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

FIG. 5 is a cross-sectional view of a drainage channel 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 without water permeability,
12 Conventional U-tube made of non-permeable concrete, 13
Water-permeable U-shaped tube, 14 water-permeable L-shaped block

Claims (3)

[Claims] 1. A crushed stone is formed by filling crushed stones inside a groove in which a subgrade is dug, a perforated pipe is embedded in the crushed stone layer, and a water-permeable sheet and a sand-laying layer are provided above the crushed stone layer. A drainage groove having water permeability, characterized in that a water permeable block is installed through the. 2. The water-permeable drainage groove according to claim 1, wherein a perforated pipe is buried below the center of the crushed stone layer. 3. The water-permeable drainage ditch according to claim 1 or 2, wherein the crushed stone layer is composed of single-grain crushed stones having a uniform grain size.