JP2961223B2 - 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 seawater is interrupted to make it easier for sand to settle at a desired creation site, or a beach-forming material such as sand is supplied. 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 water in the surrounding sea area is poor, the created beach is also polluted, and it is not a space that can be familiar with water.

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 even in a deep water portion and is hardly polluted.

Means for Solving the ProblemsThe artificial beach of the present invention is a weir in which an opening communicating with the surrounding sea area and the inner sea area is formed at the lower part while partitioning the inner sea area from the surrounding sea area, An upper and lower partitioning member formed at a position separated from the weir and a communication hole partitioning the lower region and the upper region following the opening and communicating the lower region and the upper region, and a filling for attaching microorganisms provided in the lower region A layer made of a beach building material such as sand provided on the upper and lower partition members, and a seawater reservoir formed by lowering the surface of the layer made of the beach building material. It is a thing.

Further, in the artificial beach of the present invention, a surface-side layer is formed with a small-particle-size laying material using a large-particle-size laying material and a small-particle-size lithographic material as the beach formation material. It is preferable to form a seawater flow channel inside the surface layer by continuously arranging a large particle forming material therein.

The upper and lower partition members are desirably formed of a water-impermeable or low-water-permeable material. Examples of a material for forming the upper and lower partition members include a rigid plate, a flexible sheet, and the like.

In addition, as the filler for attaching microorganisms, various kinds of materials such as ceramics and plastics formed into a shape having a large specific surface area, gravels having a diameter of about 5 to 20 cm, anti-firestone, and the like can be used as long as a microorganism film is easily formed. Available.

[Operation] In the artificial beach having such a structure, when the water level in the surrounding sea area rises due to the ebb and flow of the tide, the seawater in the surrounding sea area flows into the lower area of the internal sea area from the opening of the weir. The lower region is provided with a layer of a microorganism-adhering filler material, and seawater passing through the lower region is purified by the action of a biofilm that has grown on the surface of the filler material. Thereafter, the seawater flows into the upper region through the communication holes of the upper and lower partition members provided on the opposite side to the opening of the weir,
Next, it reaches the seawater storage section through the layer made of beach construction materials.

On the other hand, when the water level in the surrounding sea area falls due to the ebb and flow of the tide,
Since the water level of the seawater storage section in the inner sea area is higher than the surrounding sea area, the difference in water level causes the seawater in the seawater storage section to be separated from the layer made of the beach building materials, the communication holes of the upper and lower partition members, and the microorganisms in the lower area of the inner sea area. After passing through the layer of the adhesion filler, it flows out of the weir opening into the surrounding sea area.

"Example" Hereinafter, the artificial beach of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the artificial beach of the present invention.
Reference numeral 1 in the figure denotes an existing revetment. A weir 2 is provided offshore of the revetment 1. It is provided on the semicircle of the weir 2 and partitions the inner sea area 4 from the surrounding sea area 3.
The weir 2 is composed of a submerged bank 5 and a floating shield 6. The submerged bank 5 has a trapezoidal cross section and is fixed to the sea floor. The floating shield 6 is composed of a partition sheet 7 having one end fixed to the head of the submerged bank 5 and a tubular float 8 attached to the other end of the partition sheet 7. An opening 9 that connects the surrounding sea area 3 and the inner sea area 4 is provided in the submerged portion 5 of the weir 2.
Are formed at a plurality of locations.

The inner sea area 4 partitioned by the weir 2 is partitioned into a lower area 11 and an upper area 12 by upper and lower partition members 10. The lower region 11 is formed so as to directly communicate with the openings 9 of the weir 2. And in this lower region 11,
Crushed stone as a filler for attaching microorganisms is charged to form the biological treatment layer 17. On this biological treatment layer 17, slightly fine stones are put for flattening the surface.
The upper and lower partition members 10 include a thick rubber sheet 14 having one end fixed near the head of the submerged bank 5 of the weir 2, and a fixed plate 15 fixing the other end of the rubber sheet 14 to the seawall 1. Is formed. In this way, the upper and lower partition members 10 are supported by stones thrown into the lower region 11. In the fixed plate portion 15 of the partition member 10, communication holes 16 communicating the lower region 11 and the upper region 12 are formed.

A gravel layer 18 is formed on the upper and lower partition members 10. The gravel layer 18 has a coating layer 20 formed of fine sand, and seawater channels 21 formed by continuously arranging gravel having a larger particle size than sand.

The gravel layer 18 is formed to be thinner at a position away from the portion where the through hole 16 of the upper and lower partition member 10 is provided. The thinned portion of the gravel layer 18 is the seawater storage section 19.

Next, the entry and exit of seawater on the artificial beach will be described.

First, when the water level in the surrounding sea area 3 rises due to the ebb and flow of the tide and becomes higher than the water level on the seawater storage unit 19 side in the inside sea area 4, the seawater in the surrounding sea area 3 flows into the inside sea area 4 due to this water level difference. The seawater in the surrounding sea area 3 first flows into the lower area 11 of the inner sea area 4 from the openings 9 of the weir 2 and passes through the biological treatment layer 17 formed in the lower area 11. Seawater passing therethrough is purified by the action of the biofilm grown on the surface of the filler forming the biological treatment layer 17. The seawater that has passed through the biological treatment layer 17 is separated from the upper and lower partition members 10 provided at a position away from the weir 2.
Flows into the upper region 12 through the communication holes 16. Thereafter, the seawater passes through the gravel layer 18 and reaches the seawater storage unit 19.

Then, due to the ebb and flow of the tide, the water level in the surrounding sea area 3 drops, and the seawater storage section 19 in the internal sea area 4 becomes higher than the surrounding sea area 3. When the water level difference increases, the seawater in the seawater storage section 19 causes the seawater layer 1
8. After passing through the biological treatment layer 17 and undergoing biological treatment again, it flows out from the opening 9 of the weir 2 to the surrounding sea area 3.

Thus, this artificial beach is composed of the surrounding sea area 3 and the inner sea area 4
Are separated by the weir 2 having the opening 9, and the inner sea area 4 is partitioned by the upper and lower partition members 10 into a lower region 11 and an upper region 12 following the opening 9 of the weir 2. Lower area 11 and upper area 12 are communication holes
16 and a biological treatment layer 17 is provided in the lower region 11 and a gravel layer 18 is formed in the upper region 12.
The seawater storage portion 19 is formed by lowering the surface of the upper and lower partition member 10 at a position away from the communication hole 16 so that the water level of the surrounding sea area 3 fluctuates due to ebb and flow of the tide. Opening 9 in the lower region 11 of the biological treatment layer 17 communicating hole 16 in the upper and lower partition member 10 upper region 12
The seawater flows to the gravel layer 20 and the seawater storage unit 19 of the seawater. In the meantime, the seawater is purified by the action of the microorganism film that has grown on the surface of the microorganism-adhering material of the biological treatment layer 17.

Therefore, according to this artificial beach, the seawater in the surrounding sea area 3 flows into the seawater storage section 19 after being purified by the biological treatment layer 17 provided in the upper region 11, and even if the water quality in the surrounding sea area 3 is poor, The sea area 4 can be kept clean.

In addition, when this artificial beach is provided, the water flows from the inner sea area 4 to the purified sea water surrounding sea area 3, so that the water quality of the surrounding sea area 3 is also improved.

Further, in this artificial beach, since the upper and lower partition members 10 are provided in the inner sea area 4 and the gravel layer 18 is formed thereon, the amount of beach building material such as sand required for formation is greatly reduced. Therefore, the artificial beach can be easily formed in a deep portion such as a steep beach or seawall.

In addition, in this artificial beach, since the seawater channels 21 are formed by continuously arranging the gravel in the covering layer 20 made of sand, the resistance when the seawater flows due to the ebb and flow of the tide becomes small. Therefore, this artificial beach has good fluidity of seawater.

In addition, on this artificial beach, the upper part of the weir 2 is formed by the floating type shield part composed of the float 8 and the partition sheet 7, so that the height of the weir 2 matches the height of the water surface. Therefore, in this artificial beach, it is possible to avoid that the weir 2 partitioning the internal sea area 4 is inconspicuous and that the internal sea area 4 does not feel enclosed,
You can visually enjoy the waterside scenery.

[Effect of the Invention] As described above, the artificial beach of the present invention is a weir that partitions the inner sea area from the surrounding sea area and has an opening formed in the lower part that communicates the surrounding sea area and the inner sea area, and a weir formed by the inner sea area. An upper and lower partition member formed at a position separated from the weir and a communication hole separating the lower region and the upper region following the opening and communicating the lower region and the upper region, and for attaching microorganisms provided in the lower region. It is composed of a layer of a filler, a layer of a beach building material such as sand provided on the upper and lower partition members, and a seawater storage section formed by lowering the surface of the layer of the beach building material. It was done.

In the artificial beach of the present invention having such a configuration, the seawater connected to the communicating hole gravel layer seawater storage part of the biological treatment layer upper and lower partition members in the lower area of the opening of the surrounding seawater weir due to the fluctuation of the water level in the surrounding seawater due to the ebb and flow of the tide. Flow occurs. In the meantime, the seawater is purified by the action of the microbial membrane that has grown on the surface of the filler for microbial adhesion that has been introduced into the lower region.

Therefore, according to the artificial beach of the present invention, after the seawater in the surrounding sea area is purified by the biological treatment layer, it flows into the seawater storage unit in the inner sea area, and the inner sea area is kept clean even when the water quality in the surrounding sea area is poor. Can be.

In addition, when the artificial beach of the present invention is provided, purified seawater from the internal sea area flows out to the surrounding sea area, so that the water quality of the surrounding sea area is also improved.

Further, in the artificial beach of the present invention, since the upper and lower partition members are provided in the inner sea area and the gravel layer is formed thereon, the usage of the beach building material such as sand is greatly reduced. Therefore, the artificial beach of the present invention can be easily formed even in a deep portion such as a steep beach or seawall.

Further, in the artificial beach according to claim 2, a surface-side layer is formed by a small-particle-size forming material using a large-particle-size forming material and a small-particle-size forming material as the beach-forming material. The arranging material of large particle size is continuously arranged in the
Since the seawater channel is formed inside the layer on the surface side, the resistance when seawater flows due to the ebb and flow of the tide becomes small. Therefore, this artificial beach becomes easy for seawater to flow.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the artificial beach of the present invention. 2 ... weir 3 ... surrounding sea area 4 ... internal sea area 9 ... opening 10 ... upper and lower partition member 11 ... upper area 12 ... upper area 16 ... communication hole 17 ... biological treatment tank (filling for microorganism attachment) Layer of wood 18) Sand and gravel layer (layer made of beach construction material) 19 ... Seawater storage unit 20 ... Cover layer (surface side layer) 21 ... Seawater flow channel

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 999999999 Taiyo Kogyo Co., Ltd. 4-84-4 Kikawahigashi, Yodogawa-ku, Osaka-shi, Osaka (73) Patent holder 999999999 Daito Kogyo Co., Ltd. 1-chome Kameido, Koto-ku, Tokyo 38-6 (73) Patent holder 999999999 Nippon Solid Co., Ltd. 2-16-1, 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 Prefecture (72) Inventor Chiaki Niwa 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Corporation (72) Inventor Atsushi Watanabe 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo Kurita Kogyo Co., Ltd. (72) Inventor Toshihiko Tanzoe 4-13, Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction (72) Inventor Chiaki Oi 1-36-6 Kameido, Koto-ku, Tokyo Daito Kogyo Co., Ltd. (72) Takeo Nakajima 2-23-18 Shimomeguro, Meguro-ku, Tokyo Wakatsuki Construction Co., Ltd. (58) Investigated field (Int.Cl. ⁶ , DB name) E02B 3/00

Claims (2)

(57) [Claims] 1. A weir having an opening formed at a lower portion for partitioning an inner sea area from a surrounding sea area and communicating the surrounding sea area and the inner sea area, and dividing the inner sea area into a lower area and an upper area following the opening of the weir. And a communication hole communicating the lower region and the upper region is formed at a position separated from the weir, the upper and lower partition member, a layer of the microorganism-adhering filler provided in the lower region, An artificial beach, comprising: a layer made of a beach forming material such as sand provided in a seawater storage portion provided on a surface of the layer formed by lowering the surface of the layer made of the beach forming material. 2. A surface-side layer is formed by a small-particle-size forming material using a large-particle-size forming material and a small-particle-forming material as the beach forming material, and the surface-side layer is formed in the surface-side layer. The artificial beach according to claim 1, wherein a seawater channel is formed inside the layer on the surface side by continuously arranging the large-diameter forming materials.