JP3007939B2 - Artificial beach - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial beach having a structure suitable for forming steep beaches and seawalls and having a self-purifying ability.

"Conventional technology" In recent years, ports in urban areas have been reclaimed, the waterside has been surrounded by artificial upright seawalls, and seashores with priority on industry and functions have been formed. On the other hand, social needs for beaches that are close to water are increasing every day in order to restore nature and enrich life.

2. Description of the Related Art Conventionally, when creating a beach, the flow of the beach is obstructed to make it easier for the sand to settle at a desired creation site, or a beach building material such as sand has been introduced. And the artificial beach created in this way was simply a beach formation material deposited.

"Problems to be Solved by the Invention" In such a conventional artificial beach, there is a problem that a large amount of beach building material is required, so that it cannot be formed in a deep sea depth such as a steep beach or seawall. .

Further, in the conventional artificial beach, if the quality of the surrounding water is poor, the created beach is also polluted, and it is not a space that can be familiar with water, so that there is a problem that it is unsuitable for a waterside in an urban area.

In addition, in the sea area around the artificial concentration area, sludge contamination could not be completely eliminated, and measures were required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an artificial beach which can be formed in a deep water portion, is less likely to be polluted, and can eliminate sludge pollution.

[Means for Solving the Problems] A first aspect of the present invention is to provide an opening provided in a surrounding sea area at a predetermined distance from a shore such as a seawall or a steep beach, and communicating with the surrounding sea area side and the shore side. Is formed, between the shore and the weir, and a sludge layer provided up to the opening height or less, a waterproof sheet covering the surface of the sludge layer, and provided on the waterproof sheet, and A water passage communicating with an opening of the weir, and a beach building material such as sand provided on the water passage so that a surface descends from the shore toward the weir. And

A second aspect of the present invention is characterized in that the water-passing portion is provided at a position away from the weir, with a water-passing portion connecting the surface of the beach building material and the water-passing portion. .

"Operation" When the water level in the surrounding sea area rises due to the ebb and flow of the tide, seawater flows into the shore through the opening of the weir and the beach building material, and there are two paths that freely flow in the upper part of the weir. Seawater flows into the revetment from the sea. Then, the seawater flowing from the opening of the weir and passing through the beach building material via the water passage section is purified by the action of the biofilm grown on the surface of the sandstone or the like forming the beach building material.

In addition, when the water level in the surrounding sea area falls due to the ebb and flow of the tide, the seawater flows out of the two paths that flow out to the surrounding sea area through the seashore building material and the opening of the weir, and two paths that flow freely above the weir. Seawater flows out to the sea area. Then, the seawater flowing out of the weir opening through the opening of the weir from the beach building material through the water flow section is subjected to biological treatment again, and then discharged to the surrounding sea area.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing a first embodiment of the present invention, wherein reference numeral 1 denotes an existing revetment, and 2 denotes an artificial beach.

The artificial beach 2 includes a weir 3 provided in a surrounding sea area at a predetermined distance from the revetment 1, a sludge layer 5 provided between the revetment 1 and the weir 3, a waterproof sheet 6 covering the sludge layer 5,
It comprises a water passage section 8 provided on the waterproof sheet 6 and a beach building material 10 provided on the water passage section 8.

The weir 3 is formed to have a trapezoidal cross section and is fixedly provided on the sea floor, and is provided as a submerged levee such that the upper surface thereof is always lower than the sea surface L. The weir 3 has an opening 3a communicating with the surrounding sea area side 12 and the revetment side 13 at a predetermined height.
Are formed so as to expand in diameter toward the surrounding sea area.

The sludge layer 5 has a form in which the surface descends from the revetment 1 toward the weir 3 between the weir 3 and the revetment 1, and substantially coincides with the height of the opening 3 a of the weir 3 on the contact surface with the weir 3. It is provided to be deposited in form. When the sludge layer 5 is formed, if the sludge is formed after dehydration treatment or solidification, a more stable sludge layer 5 can be obtained.

The waterproof sheet 6 is provided to cut off the contact between the water passage section 8 and the sludge layer 5, and is made of a rubber sheet having no water permeability.

Crushed stone, rubble or the like is used for the water passage section 8, and the weir 3
The waterproof sheet 6 is provided on the upper surface of the waterproof sheet 6 in such a manner that the thickness of the layer decreases from the opening 3a toward the revetment 1.

The beach forming material 10 is made of, for example, crushed stones in the water passage section 8 and sand having a smaller particle size than the gravel, and the surface thereof is formed so as to descend from the seawall 1 to the weir 3.

Microbes or benthic organisms inhabit the surface of each particle of the water passage section 8 and the beach building material 10 and the gap between them, and have a property of purifying seawater passing therethrough physicochemically or biochemically. Equipped.

Next, the operation and effect of the artificial beach of the present embodiment will be described.

When the water level in the surrounding sea area rises due to the ebb and flow of the tide, seawater flows into the revetment side through the opening 3a of the weir 3 and the beach building material 10, and there are two paths that freely flow in the upper part of the weir 3. Seawater flows into the revetment from the route. Then, the seawater flowing from the opening 3a of the weir 3 and passing through the beach building material 10 via the water passage section 8 is purified by the action of the biofilm grown on the surface of the sand or the like forming the beach building material 10. You.

Further, when the water level in the surrounding sea area falls due to the ebb and flow of the tide, the seawater flows freely to the surrounding sea area side 12 through the beach building material 10 and the opening 3a of the weir 3, and the seawater freely flows out above the weir 3. Seawater flows out of the two routes to the surrounding seaside 12. Then, the opening of the weir 3 from the beach building material 10 through the water flow section 8
The seawater flowing out of 3a is subjected to biological treatment again and then discharged to the surrounding sea area 12.

With such a configuration and operation, the artificial beach of this embodiment has the following effects.

Since the land can be formed using sludge, sludge disposal in the sea area around the revetment can be performed, and high-quality building materials such as sand can be saved.

By the self-purifying action of the artificial beach, a clean seaside can be obtained while purifying the surrounding sea area near the revetment 1.

By adjusting the amount of sludge or the like, it is possible to create deep water.

In the present embodiment, the shape of the opening 3a of the weir 3 is
It is appropriately determined in consideration of the amount of water passing through the water passing section 8, and the like.
2 to 4 may be used. Second
The opening 3a of the weir shown in the figure is the opening of the weir 3 shown in FIG.
It is formed with a slightly smaller diameter than 3a.

A plurality of openings 3a of the weir 3 shown in FIG. 3 are formed at predetermined intervals in the height direction of the weir 3.

The opening 3a of the weir 3 shown in FIG. 4 is formed to have a constant cross-sectional area.

Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, portions having the same configuration as in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The water passage section 8 of the present embodiment has a water passage section 8a that connects the surface of the beach building material 10 and the water passage section 8 at a position away from the weir 3.

According to the artificial beach of the present embodiment, the seawater flowing in from the opening 3a of the weir 3 reaches the surface of the beach building material 10 via the water passage section 8 and is also located on the side of the surrounding sea area from the surface of the beach building material 10
A part of the seawater flowing out to 12 is again discharged through the water passage section 8. Therefore, seawater that flows into and out of the artificial beach will not be
A higher purification action can be obtained by contact with the biofilm 10 and the water passage 8. This effect is promoted by using a configuration in which the weir 3 is not a submerged embankment and the upper surface thereof is higher than the sea surface L.

The opening of the weir 3 is also provided on the artificial beach of this embodiment.
The shape of 3a may be as shown in FIG. 6 to FIG. Further, as shown in FIG. 9, the sludge layer 5 may have a horizontal surface.

In any of the above embodiments, the upper surface may be higher than the sea surface L without using the weir 3 as a submerged bank.

“Effect of the Invention” The artificial beach according to claim 1 is provided in a surrounding sea area at a predetermined distance from a shore such as a seawall, a steep seashore, and the like.
A weir formed with an opening communicating with the surrounding sea area side and the shore side,
A sludge layer provided between the shore and the weir and up to the opening height, a waterproof sheet covering the surface of the sludge layer, and a waterproof sheet provided on the waterproof sheet and communicating with the opening of the weir; And a beach construction material such as sand provided such that the surface descends toward the weir from the shore on the water passing portion, so that sludge is used. It is possible to create land, and to dispose of sludge in the sea area around the revetment, and to save high quality materials such as sand.

In addition, a clean seaside can be obtained while purifying the surrounding sea area near the revetment by the self-purifying action of the artificial beach.

Further, by adjusting the amount of sludge or the like, it is possible to create a deep portion of the water.

The artificial beach according to claim 2 has a configuration in which the water-passing portion is provided with a water-passing portion that connects the surface of the beach building material and the water-passing portion at a position away from the weir. The seawater that flows into the beach and flows out of the artificial beach has an effect that, upon inflow and outflow, it is possible to obtain a higher purification action by contacting the beach with the biofilm in the water passage section.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a side sectional view of an artificial beach, FIGS. 2 to 4 are side sectional views of a weir, FIG. 5 to 8 are views showing a second embodiment of the present invention, wherein FIG. 5 is a side sectional view of an artificial beach, FIGS. 6 to 8 are side sectional views of a weir, FIG. FIG. 9 is a side sectional view showing another embodiment. 1 ... revetment, 2 ... artificial beach, 3 ... weir, 5 ... sludge layer, 6 ... waterproof sheet, 8 ... water passage section, 10 ... beach construction material.

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 999999999 Daito Kogyo Co., Ltd. 1-36-6 Kameido, Koto-ku, Tokyo (73) Patent holder 999999999 Nippon Solid Co., Ltd. 2-6-1 Shimbashi, Minato-ku, Tokyo (73) Patent Holder 999999999 Fujita Co., Ltd. 4-6-115 Sendagaya, Shibuya-ku, Tokyo (73) Patent Holder 999999999 Wakatsuki Construction Co., Ltd. 1-4-7 Hamacho, Wakamatsu-ku, Kitakyushu-shi, Fukuoka (72) Inventor Chiaki Niwa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tadashi Otsuki 5 Yonbancho, Chiyoda-ku, Tokyo Toa Construction Industry Co., Ltd. (72) Inventor Toshihiko Yazoe Tokyo 13 Sumitomo Construction Co., Ltd., 13-1, Arakicho, Shinjuku-ku, Tokyo (72) Inventor Chiaki Oi 1-38-6 Kameido, Koto-ku, Tokyo Daito Kogyo Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) E02B 3/00

Claims (2)

(57) [Claims] 1. A weir provided in a surrounding sea area at a predetermined distance from a shore such as a revetment or a steep shore, and an opening communicating with the surrounding sea area side and the shore side is formed. And, and the sludge layer provided up to the opening height or less, a waterproof sheet covering the surface of the sludge layer, a water passage provided on the waterproof sheet, and communicating with the opening of the weir, An artificial beach, comprising: a beach formation material such as sand provided on the water passage portion such that a surface thereof descends from the shore to the weir. 2. The water passage section is provided with a water passage section that connects the surface of the beach building material and the water passage section at a position away from the weir. Artificial beach.