JP7320292B2 - catch basin - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catch basin provided in a drainage facility of an artificial turf ground.

In recent years, the existence of microplastics has been widely taken up as one of the causes of marine pollution. Major convenience store chains and fast food stores have started charging for plastic shopping bags, efforts to reduce the use of plastic shopping bags, and replacement of plastic straws with paper straws are raising awareness of environmental protection. According to Non-Patent Document 1 below, artificial turf accounts for 14% of the total plastic collected in the survey, and is reported to be one of the biggest problems in the problem of domestic microplastic outflow.

On the other hand, the following Patent Documents 1 and 2 disclose drainage ditches in playgrounds and stadiums using outdoor artificial turf.

JP 2016-020574 A JP 2017-179933 A

"Investigation of microplastics floating in rivers, harbors and lakes in Japan" and "Investigation of outflow sources of artificial turf" reports. Published on March 25, 2020, corrected on May 15, 2020, corrected on May 20, 2020. Co., Ltd. / General Incorporated Association Pirika (https://drive.google.com/drive/folders/11mTGZwQ7AXVpufAZc7lSWP6Lfc2KlOAU)

On artificial turf grounds, fragments of artificial turf damaged by spike shoes during play and rubber chips that make up the layer in which artificial turf is planted may flow into the drainage as microplastics. An object of the embodiments of the present disclosure is to provide a catchment in a drainage ditch of an artificial turf ground, which can prevent fragments of artificial turf and rubber chips from flowing out from the artificial turf ground.

In view of the above problems, an embodiment of the present disclosure is a catch basin provided in a drainage ditch of an artificial turf ground, comprising a water inlet, a water outlet, and a water inlet and a water outlet. and a water-permeable filter provided therebetween.

This filter does not substantially block the permeation of water that has flowed in from the inflow port, but has gaps that can block the permeation of fragments of artificial turf and rubber chips that have flowed in with the water. Specifically, it is desirable that the filter has voids of a size capable of blocking passage of silica sand having a particle size exceeding 0.8 mm.

A porous water-permeable concrete board can be used as the filter having voids as described above. It is desirable that the porous water-permeable concrete board has pores having a diameter of 0.4 mm or more and 3.7 mm or less as the voids.

Also, a coconut fiber non-woven fabric board can be used as the filter having voids as described above. The coconut fiber nonwoven fabric board preferably has a density of 49.5 kg/m ³ or more and 60.5 kg/m ³ or less.

It is possible to provide a catchment in a drainage ditch of an artificial turf ground, which can prevent fragments of the artificial turf and rubber chips from flowing out from the artificial turf ground.

It is a top view which shows the example of the installation position of the catch basin of embodiment. FIG. 2 is an enlarged view of the portion indicated by A in FIG. 1; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. FIG. 3 is a sectional view along IV-IV in FIG. 2; FIG. 3 is a cross-sectional view taken along the line VV of FIG. 2; FIG. 6 is a sectional view taken along line VI-VI of FIG. 5; It is a modification of FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7; FIG. It is a photograph which shows the experimental procedure of an Example. It is a photograph which shows the experimental procedure of an Example. It is a photograph which shows the experimental procedure of an Example. It is a photograph which shows the experimental procedure of an Example. It is a photograph which shows the experimental procedure of an Example. It is a photograph which shows the experimental procedure of an Example.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

FIG. 1 is a plan view showing the installation position of the catch basin 30 of the embodiment on the artificial turf ground 10. As shown in FIG. Also, FIG. 2 is an enlarged view of the portion indicated by A in FIG. A drainage groove 20 is provided along the edge of the artificial turf ground 10. - 特許庁The upper surface of the drainage ditch 20 is covered with a removable side ditch cover 21 (see FIG. 2). The artificial turf ground 10 gently slopes toward the edge as indicated by the arrows in the figure. The drain ditch 20 has the upper long side in the figure as the upstream, passes through the left and right short sides, and the lower long side as the downstream. The drainage grooves 20 on the upper long side are connected by connection boxes 20a provided at substantially equal intervals. In addition, a plurality of catch basins 30 are provided at approximately equal intervals in the middle of the drainage grooves 20 on the left and right short sides and the lower long side. The water in the drainage ditch 20 flows from the upstream in the direction of the arrow in the figure, and is discharged from the discharge pipe 50 downstream of the final catch basin 30a, which is the catch catch basin 30 located furthest downstream in the center of the lower long side. 60.

FIG. 3 is a sectional view taken along line III--III in FIG. In the artificial turf ground 10, an asphalt layer 13 is paved on a crushed stone substrate 14 as a base layer, and an artificial turf 11 made of synthetic resin is laid thereon. Rubber chips 12 are filled in gaps of the artificial turf 11 . A drainage groove 20 formed by a U-shaped groove is provided on the edge of the artificial turf ground 10. - 特許庁The open upper surface of the drainage ditch 20 is covered with a gutter lid 21 provided with a water fall hole 22. - 特許庁

FIG. 4 is a sectional view along IV-IV in FIG. 5 is a cross-sectional view taken along the line VV of FIG. 2. FIG. Each of the concrete catch basins 30 has a square prism shape with a hollow interior and an open top. An upper opening of the catch basin 30 is closed with a removable lid 37 . The inside of the catch basin 30 is divided into two by a permeable filter 32 provided near the middle in the height direction. In other words, the inside of the catch basin 30 is divided into an upper upstream portion 35 of the filter 32 and a lower downstream portion 36 of the filter 32 (see FIG. 5). The catch basin 30 is provided with an inlet 33 through which water flows from the drain 20 and an outlet 34 through which water flows out. That is, the filter 32 is provided between the inflow port 33 and the outflow port 34 . The outflow port 34 communicates with the downstream portion 36 of the catch basin 30 on the downstream side by a connecting pipe 40 . Also, the outflow port 34 of the final catch basin 30 a is connected to the discharge pipe 50 .

As shown in FIG. 6, which is a cross-sectional view taken along line VI-VI of FIGS. 5 and 5, the filter 32 is attached to a filter receiver 31 provided near the middle of the water collecting basin 30 in the height direction. 5 and 6, two semi-circular porous permeable concrete boards 32a are fitted into a circular hole formed in the center of the filter receiver 31 as the filter 32. In FIGS. In addition, the shape of the porous water-permeable concrete board 32a is not limited to the semi-circular shape of the present embodiment, and a circular shape may be similarly fitted. The porous water-permeable concrete board 32a may also be formed in any shape (for example, square, hexagon, etc.) according to the shape of the holes formed in the filter receiver 31. FIG.

Further, as shown in FIG. 7 which is a modification of FIG. 5 and FIG. 8 which is a sectional view taken along line VIII-VIII of FIG. When the coconut fiber non-woven fabric board 32b is used as the filter 32, as shown in FIG. The filter 32 can be obtained by placing a coconut fiber nonwoven fabric board 32b molded into a square planar shape.

Fragments of the artificial turf 11 damaged during play on the artificial turf ground 10 flow out to the drainage ditch 20 together with drainage flowing along the slope of the artificial turf ground 10.例文帳に追加At this time, there is a possibility that the rubber chips 12 filled at the root of the artificial turf 11 may flow out at the same time. Fragments of the artificial turf 11 flowing out with the drainage reach the drain hole 22 of the gutter cover 21 . When the drainage that has fallen from the water fall hole 22 into the drainage ditch 20 enters the water collection basin 30 from the inlet 33, it passes through the filter 32 from the upstream section 35 to the downstream section 36, and from the outlet 34, the next water collection. It is discharged to the trough 30 .

At this time, since the filter 32 is provided with a gap large enough to block the passage of silica sand having a particle size exceeding 0.8 mm, the passage of water is not blocked, but fragments of the artificial turf 11 and Almost 100% of the rubber chips 12 are captured by the filter 32 and do not reach the downstream portion 36 . Therefore, the catch basin 30 of the present embodiment having such a filter 32 prevents fragments of the artificial turf 11 and rubber chips 12 from being discharged into the public sewage system 60 together with waste water. Whether or not the filter 32 to be used has voids large enough to block passage of silica sand having a particle size exceeding 0.8 mm can be determined by, for example, This can be verified by sprinkling silica sand, running water, and confirming that the particle size of the silica sand that has passed through is 0.8 mm or less.

When a porous water-permeable concrete board 32a is used as such a filter 32, it is desirable to use one having pores with a diameter of 0.4 mm or more and 3.7 mm or less. Moreover, when the coconut fiber nonwoven fabric board 32b is used as such a filter 32, it is desirable to use a board with a density of 49.5 kg/m ³ or more and 60.5 kg/m ³ or less.

It was confirmed by experiments that the filter 32 does not allow fragments of the artificial turf 11 and rubber chips 12 to pass through. The experimental method is as follows.

First, as shown in FIG. 9, four concrete blocks were assembled in parallel so as to leave a space in the center.

Then, as shown in FIG. 11, a filter 32 was placed thereon. Although FIG. 11 shows an example using a porous water-permeable concrete board 32a as the filter 32, a coconut fiber non-woven fabric board 32b was also placed in the same manner. It should be noted that what is placed on the filter 32 in FIG. 11 is a test material, which will be described later, subdivided into small bags.

Then, as shown in FIG. 12, the test material was sprinkled over the filter 32, and then water was run for 5 minutes at a flow rate of 0.336 m ³ /hour as shown in FIG. Thereafter, if there was a test material that had passed through the filter 32 as shown in FIG. 14 on the cotton cloth from which the filter 32 was removed, it was collected and its size was measured.

As the porous water-permeable concrete board 32a as the filter 32, a water-permeable board made of water-permeable concrete No. 7 crushed stone manufactured by Kokuka Corporation was used. The theoretical value of the void diameter was 0.4 to 3.7 mm.

For the coconut fiber non-woven fabric board 32b as the filter 32, a Vinyllock water permeable pipe (ST-50) made of coconut fiber non-woven fabric manufactured by Kyoei Sangyo Co., Ltd. was used. Its density was 0.55 g/cm ³ ±10%. This coconut fiber non-woven fabric board 32b was used in two different thicknesses of 50 mm and 100 mm.

As test materials, 4 g of artificial turf fragments (10 to 20 mm in length), 20 g of rubber chips (0.5 to 3 mm in diameter), and 30 g of silica sand (Color Sand, Saitozaki Kosan) with an effective diameter of 0.3 to 1.0 mm were used. used.

As a result of the above experiment, the porous water-permeable concrete board 32a did not allow any fragments of artificial turf or rubber chips to pass through. Moreover, the maximum particle size of the passing silica sand was 0.6 mm.

The 50 mm thick coconut fiber non-woven board 32b did not allow any artificial turf fragments or rubber chips to pass through. Moreover, the maximum particle size of the passing silica sand was 0.8 mm.

The 100 mm thick coconut fiber non-woven board 32b also did not allow any artificial turf fragments or rubber chips to pass through. Moreover, the maximum particle size of the passing silica sand was 0.5 mm.

As a result of the above, it has been demonstrated that at least the filter 32 can be used as the filter 32 of the catch basin 30 of the present embodiment as long as it has a performance to the extent that it can block the passage of silica sand having a particle size of more than 0.8 mm. rice field.

INDUSTRIAL APPLICABILITY The present invention can be used for a catch basin provided in a drainage facility of an artificial turf ground.

10 artificial turf ground 11 artificial turf 12 rubber chip 13 asphalt layer 14 crushed stone base 20 drainage ditch 20a connection pit 21 gutter cover 22 water fall hole 30 catchment pit 30a final catchment pit 31 filter receiver 32 filter 32a porous permeable concrete board 32b coconut fiber Non-woven fabric board 33 inlet 34 outlet 35 upstream section 36 downstream section 37 lid 40 connecting pipe 50 discharge pipe 60 public sewer

Claims (6)

A catch basin provided in a drainage ditch of an artificial turf ground,
a water inlet;
a water outlet provided below the inlet in the height direction ;
a water-permeable filter provided between the inflow port and the outflow port and dividing the interior into two parts in the height direction ;
A catch basin, characterized by comprising: 2. The catch basin according to claim 1, wherein said filter has voids large enough to block passage of silica sand having a particle size exceeding 0.8 mm. 3. The catch basin according to claim 2, wherein said filter is a porous permeable concrete board. 4. The catch basin according to claim 3, wherein the porous water-permeable concrete board has pores with a diameter of 0.4 mm or more and 3.7 mm or less as the voids. The catch basin according to claim 2, characterized in that said filter is a non-woven coconut fiber board. The catch basin according to claim 5, wherein the coconut fiber nonwoven fabric board has a density of 49.5 kg/m3 ^or more and 60.5 kg/ ^m3 or less.