JP2019131969A - Silt fence - Google Patents

Abstract

To provide an environment friendly to an aquatic animal such as fish by improving an underwater environment in a water region outside a silt fence.SOLUTION: The silt fence is provided with: a float 1 that floats on water; a fence 2 that is connected to the lower part of the float 1; and a weight 3 that is fixed to the lower end of the fence 2. Further, in the silt fence, the fence 2 is made of a flexible sheet material 5, and plants 4 are arranged in a plurality of places on the surface of the fence 2.SELECTED DRAWING: Figure 3

Description

  The present invention is installed around the surrounding water area of the construction area during civil engineering work on the seashore, rivers, lakes, ponds, dams, etc., and the pollution generated by the work diffuses to the outside water area. More particularly, the present invention relates to a silt fence that improves an underwater environment in a water area outside the silt fence.

  Water quality in the construction area deteriorates when civil engineering works are carried out in the sea, rivers, lakes, etc., where revetments are constructed or the bottom of the water is dredged. In particular, when excavating the bottom and shore with a heavy machine such as a hydraulic excavator, the sediment such as mud, soil, and sludge on the bottom is stirred up and stirred, resulting in contamination of the surrounding water area and contamination of the water quality. . If the generated pollution spreads not only to the surrounding water area of the construction area but also to a wider outside water area, there is a concern that the environment will deteriorate due to the pollution.

  In order to prevent the diffusion of pollution from the construction area, a silt fence is usually installed around the construction area. The silt fence is provided with a float part floating on the water surface, a sheet-like fence part connected to the lower part of the float part, and a weight part provided at the lower end of the fence part. The fence is stretched in the form of a screen underwater. The silt fence of the above structure is installed with the fence part suspended from the water surface toward the bottom of the water with the float part floating on the water surface, and the contamination of the construction area is blocked by the fence part. Prevents diffusion into water.

  As described above, the silt fence functions to prevent the pollution generated in the construction area from diffusing into the external water area during the civil engineering work. However, such a silt fence has a problem that it cannot be removed immediately after the construction is completed. This is because even after the completion of the work, the pollution remains in the water area around the work area. For this reason, the silt fence cannot be removed even after the construction is completed until the pollution of the water area is improved, and the silt fence has been installed over a long period of time, for example, several months or more than a year. May be held in a state.

  As described above, maintaining a silt fence in a seawall, river, lake or other revetment for a long period of time is not a favorable environment for aquatic animals such as fish living in the water area. This is because the sheet-like silt fence, which is an artificial object, is held in a stretched state in water. In particular, silt fences have a sheet-like fence placed over a wide area underwater in the form of a screen, so there is no place for aquatic animals such as small fish and shrimps to lurk, making it easy to target large fish. The aquatic animals will no longer take root.

  For this reason, in a water area where such a silt fence has been placed over a long period of time, the underwater ecosystem has collapsed, and even after removal of the silt fence, the aquatic animal's living environment is It takes a very long time to return to an environment where fish can survive. In particular, an ecosystem that has collapsed once does not immediately return to its original state, and in some cases, there is a risk that the state in which fish cannot survive can continue for many years.

JP 2012-180733 A

  The present invention has been made in view of such conventional problems, and one of its purposes is to improve the underwater environment in the water area outside the silt fence installed around the water area around the construction area. It is to provide a silt fence that can realize an aquatic environment friendly to aquatic animals such as fish.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, according to the silt fence of the present invention, the float 1 that floats on the water, the fence 2 connected to the lower part of the float 1, and the lower end of the fence 2 are fixed. It is a silt fence provided with the weight part 3 made, Comprising: While the fence part 2 is comprised with the sheet | seat material 5 which has flexibility, the plant 4 is arrange | positioned in the several places on the surface of the fence part 2. FIG.

  According to the above configuration, since the plants are arranged at a plurality of locations on the surface of the fence part, the plants arranged on the surface of the sheet material are arranged by arranging the surface on which the plants are arranged in the water area outside the contaminated area. It can be installed in water to create an aquatic animal-friendly environment. Plants placed in the water are aquatic animals such as small fish and crustaceans, or creatures such as these larvae and plankton, and in particular, they serve as a hideout for aquatic animals belonging to the bottom of the food chain. The living environment of living things can be improved and many aquatic animals can be rooted. For this reason, like a conventional silt fence, it is possible to effectively prevent the aquatic animal from being approached by vigilance, protect the aquatic animal for a long period of time, and effectively prevent the surrounding ecosystem from being destroyed.

  As for the silt fence of this invention, the fence part 2 can make the external appearance of the surface where the plant 4 is arrange | positioned green.

  According to the above configuration, since the appearance of the surface of the fence portion on which the plant is arranged is green, it is possible to realize an environment in which various aquatic animals can easily gather without giving stress to aquatic animals that live in the water. . Thus, the silt fence which makes the appearance of a fence part green can accelerate | stimulate that an underwater fish takes root in the fence part of the external appearance which approximates a forest color by the effect similar to a protection forest with a fish.

  In the silt fence of the present invention, the plant 4 is a plant unit 5 having one or more individual plants, or a plant unit 7 having one or more plant pieces. It can arrange | position so that exchange is possible.

  According to the said structure, the plant arrange | positioned in a fence part can be exchanged freely via the coupling tool 14 on the surface of a fence part as a plant unit provided with the plant | organism | solid of 1 stock | strain or multiple strains, or 1 thru | or multiple plant pieces. Since it arrange | positions, a plant can be arrange | positioned easily and easily with respect to several places of a fence part. In addition, since the plant unit is arranged to be exchangeable via the connector 14, when the plant deteriorates with time or the silt fence is used at another site, it can be used while replacing the plant with a new one. .

  The silt fence of the present invention includes a plant 4 as an aquatic plant 4a, and the plant unit 7 includes a settlement member 21 for causing the aquatic plant 4a to grow. The aquatic plant 4a can be caused to grow on the growth member 21. .

  According to the said structure, a plant can be made to survive for a long period of time by making a plant into an aquatic plant and a plant unit to make an aquatic plant grow on an epiphytic member.

  In the silt fence of the present invention, the plant 4 can be used as a land plant 4b, and the land plant 4b can be cut with a stem to form a plant piece.

  According to the above configuration, the plant is a land plant, and the land plant is cut with a stem to form a plant piece. The plant unit is composed of one or more plant pieces. By using the plant, it is possible to arrange the plant on the surface of the fence part while procuring the plant easily and inexpensively.

  In the silt fence of the present invention, the fence part 2 can reinforce the surface of the sheet material 5 with a plurality of rows of strip-shaped reinforcing sheets 6 and connect the plant unit 7 to the reinforcing sheet 6.

  According to the said structure, while reinforcing a sheet | seat material with a reinforcement sheet, while being able to reinforce the whole fence part, it can prevent effectively that the connection part of a plant unit is damaged by connecting a plant unit to this reinforcement sheet. . In particular, in order to reduce the overall weight and reduce the volume of the silt fence, it is preferable to make the sheet material thinner and lighter, but such a thin and light sheet material tends to be damaged. Since this silt fence reinforces the sheet material with the reinforcing sheet, it can be used for a long period of time effectively preventing the sheet material from being damaged. In particular, since this silt fence is arranged in a plurality of rows with the reinforcing sheets in a strip shape, the entire fence portion can be effectively reinforced while suppressing an increase in the overall weight and volume.

  The silt fence of the present invention can reinforce the sheet material 5 by attaching the reinforcing sheet 6 to the surface of the sheet material 5 in the form of a lattice vertically and horizontally, and connect the plant unit 7 to the intersection of the reinforcing sheet 6.

  According to the above configuration, the reinforcing sheets attached to the surface of the sheet material are arranged vertically and horizontally and connected in a lattice shape, so that the sheet material can be reinforced more firmly. In particular, the structure in which the reinforcing sheet is attached to the top, bottom, left and right of the sheet material can effectively enhance the strength in the vertical direction and the strength in the length direction of the silt fence. The silt fence has a weight part at the lower end of the fence part made of sheet material, so it is easy to put a load on the sheet material when installed in the water or pulled up from the water. By reinforcing and reinforcing the reinforcing sheet in the direction, it is possible to effectively reinforce against such a load and effectively prevent the sheet material from being damaged. In addition, since silt fences are installed on rivers and coasts, they may be subjected to loads in the length direction due to water flow and tides, but silt fences are attached to the surface of the sheet material in the left-right direction. It is possible to effectively prevent the sheet material from being damaged by increasing the strength in the length direction of the fence. In addition, since the plant unit is connected to the intersection of the reinforcing sheets that are attached in a lattice shape, the load applied to the connecting part of the plant unit is supported by the intersecting reinforcement sheet, and the sheet material is effectively damaged. Can be prevented.

  In the silt fence of the present invention, the plant 4 can be arranged from the upper part to the lower part of the fence part 2.

  With the above configuration, since the plants are arranged from the upper part to the lower part of the fence part, it is possible to improve the living environment of various aquatic animals over a wide range from aquatic animals that inhabit the water bottom to aquatic animals that inhabit the water surface.

  The silt fence of the present invention can further include an air supply device 8 for supplying air to the plants 4 arranged in the fence part 2. The air supply device 8 is arranged at the lower part of the fence unit 2 and discharges the supplied air as bubbles, and an air supply pump that supplies air to the bubble generator 61 via the air supply hose 62 63, and the bubbles discharged from the bubble generating part 61 can be supplied to the plant 4.

  By the said structure, air can be supplied to the plant arrange | positioned at the fence part by discharging a bubble from the bubble generation part arrange | positioned under the fence part. Thereby, a large amount of oxygen can be supplied to the plant arranged in the fence part and aquatic animals that inhabit this plant as a hideout, and the living environment in the vicinity of the fence part can be further improved.

  The silt fence of the present invention can further include a light emitting device 9 that causes the float unit 1 to emit light. The light emitting device 9 includes a light emitting element 65 incorporated in the float unit 1, a power supply unit 66 that supplies power to the light emitting element 65, and a control unit 67 that controls the light emission state of the light emitting element 65. The light emitted from the built-in light emitting element 65 can be transmitted to the outside by using the cover 12 that covers the periphery of the floating member 11 as a translucent member.

  With the above configuration, the light emitting element built in the float part emits light, so that the position of the float part can be informed to the surroundings at night, etc., and the position of the silt fence is clearly displayed on a ship passing nearby Can do. Thereby, the safety | security of the surrounding water area at night etc. is securable.

It is a top view which shows the use condition of the silt fence concerning one Embodiment of this invention. It is sectional drawing which shows the use condition of the silt fence shown in FIG. It is the front view which looked at the silt fence shown in FIG. 2 from the outer side. It is an enlarged front view of the silt fence shown in FIG. It is a perspective view which shows another example of a plant unit. It is a perspective view which shows another example of a plant unit. It is a perspective view which shows another example of a plant unit. It is a perspective view which shows another example of a plant unit. It is a perspective view which shows another example of a plant unit. It is a front view which shows another example of a silt fence. It is a front view of the silt fence concerning other embodiments of the present invention. It is sectional drawing which shows the use condition of the silt fence shown in FIG. It is a front view of the silt fence concerning other embodiments of the present invention. It is an enlarged front view of the silt fence concerning other embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments and examples according to the present invention will be described with reference to the drawings. However, the embodiments and examples shown below exemplify a silt fence for embodying the technical idea of the present invention, and the present invention does not specify the silt fence as the following. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

  The silt fence of the present invention is installed around the surrounding water area of the construction area in the civil engineering work of the coast, water bottom, etc. of the sea, rivers, lakes, ponds, dams, etc. Prevents diffusion. Furthermore, the silt fence of the present invention can improve the aquatic environment in the water area outside the silt fence in addition to preventing the pollution from diffusing to the outside, and can realize an environment friendly to aquatic animals such as fish. I have to. In addition, in this specification, the civil engineering work performed on the seashore, rivers, lakes, ponds, dams, and other coasts and bottoms includes various works such as revetment work, dredging work, landfill work, port work, and repair work. Use in a broad sense.

  As shown in FIG. 1, the silt fence of the present invention is provided along the periphery of the construction area 51 in order to prevent the contamination of the water area around the construction area 51 from spreading to the outside due to civil engineering work performed on the coast. Installed. FIG. 1 shows a state in which a silt fence 100 is installed in a state of surrounding a water area around the construction area 51 and a water area around the construction area 51 and an outside water area are blocked when civil engineering work is performed on the coast. ing. Here, the water area around the construction area 51 and surrounded by the silt fence 100 is a pollution area 52 where the pollution generated by the construction is diffused. The silt fence 100 prevents the pollution in the pollution area 52 from diffusing to the outside.

(Embodiment 1)
A silt fence 100 shown in FIGS. 1 to 3 includes a float unit 1 having a buoyancy that floats on water, a fence unit 2 connected to a lower part of the float unit 1 and arranged from a water surface toward a water bottom, and a fence unit 2. The weight part 3 connected with the lower end of this and the plant 4 arrange | positioned at several places on the surface of the fence part 2 are provided. In the illustrated silt fence 100, the plant 4 is arranged on one side of the fence portion 2 and on the surface facing the water area outside the polluted water area 52.

  The silt fence 100 shown in FIG. 1 has a total length that can completely cover the polluted water area 52 around the construction area 51. That is, the total length of the float portion 1, the fence portion 2, and the weight portion 3 is set to the full length that can cover the polluted water area 52, and the pollution generated from the construction area 51 is enclosed in the polluted water area 52 and spreads to the external water area. It is preventing. As shown in FIG. 1, the silt fence 100 is disposed at a position away from the construction area 51 by a predetermined distance. In order to fix the silt fence 100 at a fixed position in the polluted water area 52, the silt fence 100 shown in FIG. 1 has subfloats 31 and anchors 32 connected to a plurality of locations in the middle of the float portion 1 having a predetermined overall length. Are fixed. A silt fence 100 shown in FIG. 1 and FIG. 2 connects subfloats 31 to both sides of the float portion 1 via connecting wires 33 such as upper wires, and to these subfloats 31 via anchor wires 34. The anchor 32 is fixed. The anchor 32 is disposed in a state where it is installed on the bottom of the water, and the silt fence 100 is held in a fixed position by its own weight to prevent the silt fence 100 from moving due to tidal currents, undulations, and tidal periods.

(Float part 1)
As shown in FIG. 3, the float unit 1 includes a floating member 11 having a buoyancy that floats on water. As the floating member 11, a member having a large buoyancy such as a cylindrical foamed polystyrene or a hollow plastic container can be used. The float unit 1 covers a floating member 11 made of foamed polystyrene or a plastic container with a cover unit 12 and holds it in place. The cover portion 12 is formed, for example, by forming a flexible sheet material into a cylindrical shape. The cover portion 12 houses the floating member 11 therein and connects a plurality of floating members 11 in a rosary shape in the length direction. The float unit 1 is used.

  The float part 1 can arrange | position the several floating member 11 accommodated in the cylindrical cover part 12 without gap. The float unit 1 can reliably prevent the diffusion of pollution from the water surface. However, the float part 1 can also arrange | position the some floating member 11 accommodated in the cylindrical cover part 12 with some clearance gaps provided. This float part 1 can be easily bent in the gap between the adjacent floating members 11, and the degree of freedom of the float part 1 installed on the water surface can be improved. The float part 1 shown in FIG. 3 chamfers the corner part of the both end surfaces of the floating member 11 in the shape of a curved surface, and makes it easy to bend the float part 1 in the boundary of the adjacent floating member 11.

(Fence part 2)
The fence unit 2 includes a sheet material 5 arranged in a screen shape in water and is arranged from the water surface to the bottom of the water to prevent the contamination of the polluted water area 52 from diffusing to the outside. The sheet material 5 of the fence part 2 has flexibility, and preferably uses a material that allows a liquid component to pass therethrough but does not allow a solid component to pass therethrough. As such a sheet material 5, for example, a woven sheet, a knitted sheet, or a plastic sheet in which plastic fibers such as polyester are formed to have a predetermined size can be used. However, a non-water-permeable sheet that does not allow liquid components to permeate can be used for the fence portion 2.

  Furthermore, the fence part 2 makes the external appearance of the surface where the plant 4 is arrange | positioned preferably green. The silt fence 100 can realize an environment in which aquatic animals that inhabit the water easily gather by making the outer surface of the plant 4 arranged green. In particular, the silt fence 100 with the green appearance of the fence part 2 can be expected to have the same effect as a fish-preserved forest that has been handed down since ancient times, and realizes a gentle environment without giving stress to fish that live in the water. And can help these fish take root.

  Thus, the fence part 2 which makes the external appearance green is preferably used as the sheet material 5 that is colored green. In this specification, the term “green” is used in a broad sense including a bright green such as yellowish green to a dark green such as dark green. The green sheet material 5 can be a single color and uniform in hue, but can also be partially shaded, and the hue and shade can be changed by a plurality of regions. In particular, natural shades and shades that aquatic animals do not feel uncomfortable, such as camouflage patterns, can be used. It should be noted that the silt fence 100 used by being immersed in water is likely to appear darker than the color on the ground because it is difficult for sunlight to reach in a state where the fence is deep and disposed at the bottom of the water with poor visibility. Therefore, in this specification, to make the sheet material green means a state before being submerged in water, that is, a color tone on the ground.

  The sheet material 5 is preferably green in order to reduce the stress and alertness of aquatic animals, and to allow fish to like and approach, but the present invention does not necessarily specify the color of the sheet material to be green. do not do. The sheet material can be white, which is most commonly used as a silt fence, or it can be a dark color such as brown, black or purple, or a bright color such as blue, yellow or beige.

  Furthermore, in order to reinforce the sheet material 5, the fence section 2 shown in FIG. 3 has a plurality of rows of strip-shaped reinforcing sheets 6 connected to the surface of the sheet material 5. The reinforcing sheet 6 shown in the drawing is a sheet member such as a fabric sheet, a woven fabric, a nonwoven fabric, or a woven sheet or a knitted sheet made of plastic fibers, and has a stronger strength than the sheet material 5. The fence portion 2 is attached to the belt-like reinforcing sheet 6 along the outer peripheral edge of the fence portion 2 to reinforce the outer peripheral portion, and is attached to the middle portion of the fence portion 2 in a lattice form vertically and horizontally across a plurality of rows. Thus, the sheet material 5 is reinforced.

  The fence portion 2 shown in FIG. 3 is formed in a large sheet as a whole, but in the manufacturing process, a plurality of sheet materials 5 are connected to each other at the outer peripheral edge so as to have a desired size. Can be formed. For example, when the size of one fence portion 2 is 15 m in the vertical width (H) and 20 m in the total length (L), a plurality of sheet materials 5 having a length of 1 m to several m are joined together. Thus, the fence portion 2 having a predetermined size can be obtained. Even in such a case, the connecting portion that becomes a joint of the plurality of sheet materials 5 is attached via the reinforcing sheet 6 to enhance the strength of the connecting portion and effectively prevent separation from the portion. it can.

  The reinforcing sheet 6 is reinforced by being attached not only to the joints of the plurality of sheet materials 5 but also to an intermediate portion of one sheet material 5. In the middle part of the fence part 2, the reinforcing sheet 6 attached in the vertical direction is provided from the upper end to the lower end of the fence part 2. Thereby, the intensity | strength of the up-down direction of the fence part 2 can be strengthened effectively. Further, the reinforcing sheet 6 attached to the middle part of the fence part 2 in the left-right direction is provided in a state of connecting both ends of the fence part 2. Thereby, the intensity | strength of the length direction of the fence part 2 can be strengthened effectively. When the silt fence 100 is pulled up from the state immersed in water, the weight part 3 is fixed to the lower end part, and the whole contains water, so that the whole weight increases. For this reason, the intensity | strength of the fence part 2 whole can be strengthened by attaching the strip | belt-shaped reinforcement sheet | seat 6 of multiple rows to the outer peripheral part and the intermediate part of the fence part 2 up and down, right and left, and the silt fence 100 can be strengthened. It is possible to effectively prevent the sheet material from being damaged when the sheet is pulled up.

  Here, the strength of the fence portion 2 can be increased as the interval (k) between the reinforcing sheets 6 attached to the sheet material 5 over a plurality of rows is reduced. On the contrary, if the interval (k) between the reinforcing sheets 6 is widened, the labor for manufacturing can be reduced and the cost can be reduced. Therefore, the fence part 2 determines the material of the reinforcement sheet 6 to be used, the width (d), and the space | interval (k) between adjacent reinforcement sheets 6 in consideration of these things. For example, when a cloth material is used as the reinforcing sheet 6, the lateral width (d) of the reinforcing sheet 6 is 3 to 10 cm, preferably 4 to 8 cm, and the interval (k) between the reinforcing sheets 6 is 30 cm to 200 cm, preferably 50 cm. ˜100 cm.

  The fence part 2 is preferably also green for the reinforcing sheet 6. Thereby, the whole surface of the fence part 2 can be made into a green appearance. However, since the reinforcing sheet 6 has a smaller area with respect to the entire fence portion 2 than the sheet material 5, the reinforcing sheet 6 is not necessarily specified as green, and other colors such as black, brown, purple, blue, yellow, and beige. It can also be a color or the like.

  The fence part 2 preferably has a vertical width (H) extended from the water surface to the bottom of the water in order to prevent the contamination of the surrounding water area 52 from diffusing to the outside. Furthermore, as shown in FIG. 2, the fence part 2 has flexibility so that it can bend in the front-back direction in the state arrange | positioned up and down in water. Although the flexible fence part 2 is not shown in the figure, when used in the sea, the sea surface may move up and down due to tides and undulations. It is preferable to have a sufficient vertical width (H) so that 3 does not leave the seabed. For example, in a sea area where the water depth is 5 m at low tide, the vertical width (H) is 1 m or more, preferably 3 m or more larger than this water depth. Thereby, it can prevent that the weight part 3 provided in the lower end leaves | separates from the seabed, and pollution leaks outside from this clearance gap. As described above, the fence portion 2 can have an optimum vertical width (H) in consideration of the water depth of the water area where the fence portion 2 is used, the tidal range, and the like.

(Weight part 3)
The weight part 3 is a weight provided along the lower end edge of the fence part 2. The weight part 3 has a specific gravity that sinks to the bottom of the water by its own weight and that pulls the lower end of the fence part 2 downward to sink to the bottom of the water. A metal chain can be used as such a weight part 3. The weight part 3 which is a metal chain can be deformed into a free shape by connecting a plurality of rings, and creates a gap with the bottom surface in a state where it is laid along the bottom. It can be ideally settled without any problems. As such a metal, a metal having a large specific gravity such as iron or lead can be used. In particular, iron chains are highly versatile, inexpensive and easy to process.

  As shown in FIG. 3, the weight portion 3, which is a chain, is fixed to the fence portion 2 at a plurality of locations connected to the lower end of the fence portion 2. The above weight part 3 can be disposed in a state where the lower end of the fence part 2 is settled to the bottom of the water by sinking until it comes into contact with the bottom of the water, and the sheet-like fence part 2 is spread in the form of a screen in water.

  A silt fence 100 shown in FIG. 3 forms a fence unit 10 including a float part 1, a fence part 2, and a weight part 3, and by connecting a plurality of the fence units 10, as shown in FIG. The entire length of the contaminated water area 52 in the construction area 51 can be covered. In the float part 1, opposing edges of a cover part 12 that houses a plurality of floating members 11 are connected to each other. The opposing edge of the fence part 2 is mutually connected. The weight part 3 can connect the edge which opposes mutually. For such connection, although not shown, a rope, a connection fitting, or the like can be used.

(Plant 4)
The plants 4 are arranged at a plurality of locations on the surface of the fence part 2. The silt fence 100 shown in FIG. 2 has the plant 4 arranged on one side of the fence part 2 and on the opposite side of the polluted water area 52, that is, the face facing the outer water area 53. The plant 4 is disposed in the water of the outer water area 53, improves the underwater environment in the outer water area 53, and protects the living environment of aquatic animals that inhabit the outer water area 53.

(Plant unit 7)
The plant 4 is arranged on the surface of the fence part 2 as a plant unit 7 including one or more individual individuals as shown in FIGS. 4 to 6 or as a plant unit 7 including one or more plant pieces. The The plant 4 arranged in the fence unit 2 is preferably a plant unit 7 in which a plurality of plant individuals or a plurality of plant pieces are bundled into one, and the plurality of plant units 7 are arranged in the fence unit 2 in a predetermined arrangement. Be placed. As described above, the structure in which the plurality of plants 4 are bundled and arranged on the fence unit 2 can efficiently arrange a large number of plants 4 on the surface of the fence unit 2. However, a plant does not necessarily need to be arranged as a plant unit in which a plurality of strains or a plurality of plants are bundled together, and the plant unit 7 can be constituted by one individual plant or one plant piece.

  The aquatic plant 4a can be used for the plant 4 arrange | positioned at the fence part 2. FIG. The aquatic plant 4a can be, for example, aquatic plants and algae that inhabit freshwater, or seaweeds and algae that inhabit in seawater. Since these aquatic plants 4a can survive in water, they are ideally disposed over a long period of time as plants disposed in water. Such selection of the aquatic plant 4a can be determined according to the water area where the silt fence 100 is installed. For example, silt fences installed in freshwater areas such as rivers and lakes use aquatic plants and algae that inhabit freshwater, while silt fences installed in seawater areas such as coastal areas use seaweeds and By using seaweed, the plant 4 can be kept alive for a long period of time. However, the aquatic plant 4a does not necessarily need to distinguish between plants used in freshwater and seawater, and uses seaweed and seaweed that live in seawater on silt fences installed in freshwater and brackish water. Aquatic plants and algae that live in freshwater can also be used for silt fences installed in water and brackish waters.

  As shown in FIGS. 4 to 6, the plant unit 7 having the plant 4 as an aquatic plant 4 a includes an agglutinating member 24 for aggregating the aquatic plant 4 a, and the aquatic plant 4 a is agglomerated on the aggregating member 24. Can be made. The settlement member 24 is a member that can infiltrate the roots and temporary roots of the aquatic plant 4a, and is preferably a porous member having innumerable voids. As such a deposition member 24, a plastic foam 24A having open cells, for example, a block material made of urethane foam, polyethylene foam, or the like, or porous rock 24B such as pumice or volcanic stone, or fired into a porous material. A fired body such as ceramic can be used. These growing members 24 can firmly fix the plants 24 by causing the roots and temporary roots of the plants 24 to grow, and can be disposed in water in a state suitable for the growth of the plants 24. However, the deposition member 24 is not necessarily specified as a porous member, and as shown in FIG. 6, a wood 24 </ b> C having cracks and cracks on the surface, such as driftwood and old wood, can be used. As described above, the growing member 24 for growing the roots and temporary roots of the plant 24 can firmly fix the plants 24 by causing the roots and temporary roots to enter innumerable gaps. However, since it takes time for the roots to adhere to the growing member 24, as shown in FIG. 6, the plant 24 is fixed to the surface of the growing member 24 via a binding material 25 made of a wire or string. May be. This is because the roots and temporary roots of the plant 24 fixed to the surface of the growing member 24 grow on the growing member 24 over time.

  Furthermore, the plant unit 7 can also store a plurality of plants 24 in the storage member 26. As such a storage member 26, as shown in FIG. 7, a plastic pot 26A widely used for plant cultivation can be used. Furthermore, a wooden or bamboo pot can be used for the storage member 26, or as shown in FIG. 8, a wooden, bamboo, or plastic cylinder 26B can be used. These storage members 26 are connected to the fence unit 2 as the plant unit 7 in a state in which the plurality of plants 4 are stored and fixed therein, or the roots and temporary roots of the plants 4 are fixed to the settlement member 24. It can be housed inside in a state and connected to the fence unit 2 as a plant unit 7.

  Furthermore, the plant 4 arranged in the fence part 2 as the plant unit 7 does not necessarily need to be the aquatic plant 4a, but can be a land plant 4b as shown in FIG. The plant 4 that is the land plant 4b cannot survive in the water, but even if such a land plant 4b is placed in the water, it does not wither immediately, and for a while the leaves and stems do not deteriorate, and for a certain period of time. This is because the plant leaves are kept in a thick state. Such a land plant 4b, for example, cuts a tree or grass grown on land with a stem or a branch to form a plant piece, constitutes a plant unit with one or a plurality of plant pieces, and connects to the fence unit 2 be able to.

(Connector 14)
The plant unit 7 described above is connected to a plurality of locations on the surface of the fence portion 2 via the connector 14. The plant 4 shown in FIG. 4 is a plant unit 7 formed by bundling a plurality of aquatic plants, and the plant unit 7 is connected to the surface of the fence part 2 via a connector 14 in a replaceable manner. In the plant unit 7 shown in the figure, the connector 14 is a string-like body 14A that is a wire or a string, and the string-like body 14A is bound to the connecting portion 13 provided in the fence portion 2 and fixed detachably. . However, the connection tool 14 is not limited to the string-like body 14 </ b> A, and any other device that can removably connect the plant unit to the connection portion of the fence portion, for example, a wire rod, a binding band, and a fixing bracket can be used.

(Connecting part 13)
The plant unit 7 is connected to the fence unit 2 via the connector 14, and the fence unit 2 includes a connection unit 13 for connecting the plant unit 7. The fence part 2 shown in FIGS. 3 and 4 has a strip-shaped sheet member folded back in the middle, and both ends are stacked and fixed to the fence part 2 with a fixture 15 to provide a ring-shaped connecting part 13. The same material as that of the reinforcing sheet 6 can be used for the sheet member constituting the connecting portion 13. The fixing tool 15 shown in the figure is a bolt and a nut, and the threaded portion of the bolt is passed through the fence portion 2 and the connecting portion 13 is fixed to the fence portion 2 by inserting the nut on the back surface side. However, the connecting portion 13 can also be fixed by attaching both ends of the sheet member to the fence portion 2.

  Furthermore, the fence part 2 shown in the figure reinforces the surface of the sheet material 5 with a plurality of strip-shaped reinforcing sheets 6, and the connecting part 13 is fixed to the reinforcing sheet 6. For this reason, it can prevent effectively that a sheet | seat material is damaged by supporting the connection part to which the load of the plant unit 7 connected with the connection part 13 applies the reinforcement sheet 6. FIG. In particular, the fence section 2 shown in FIGS. 3 and 4 has a plurality of rows of strip-shaped reinforcing sheets 6 arranged in a lattice shape extending vertically and horizontally and attached to the sheet material 5, and in a lattice shape intersecting vertically and horizontally. The connecting portion 13 is fixed at the intersection 6x of the reinforcing sheet 6 to be attached. In the fence portion 2 having this structure, the strength of the intersecting portion of the reinforcing sheets 6 arranged in a lattice shape is the strongest. Therefore, the structure for fixing the connecting portion 13 to which the plant unit 7 is connected to the intersecting portion 6x of the reinforcing sheet 6 uses the most reinforced portion of the fence portion 2 as a connecting portion with the connecting portion 13, and the fence portion 2, In particular, the plant unit 7 can be stably held in place while effectively preventing damage to the sheet material 5.

  As described above, the structure in which the strip-shaped sheet member is folded in the middle and both ends are fixed to the fence portion 2 to provide the connecting portion 13 is provided with the connecting portion 13 that can easily and easily connect the plant unit 7. Can do. However, the connecting portion is not specified in the above structure, and all other structures capable of detachably connecting the connecting tool 14 of the plant unit 7, for example, a string body or a wire fixed in a loop shape, a ring It is also possible to adopt a fixed metal fitting.

  The above-mentioned silt fence 100 connects the plant unit 7 to a plurality of locations of the fence unit 2 in a replaceable manner. Therefore, when the plant 4 deteriorates with time or when the silt fence 100 is used at another site, Can be used while replacing 4 with a new one. In particular, in the structure in which the leaves 4 and branches of the land plant 4b that grows on land are bundled as the plant unit 7 and arranged as the plant unit 7, the plant 4 deteriorates with time unlike the aquatic plant. When the unit 7 is used, the underwater environment can be preserved for a long period of time by exchanging the plants 4.

  In the silt fence 100 of FIG. 3, a plurality of plant units 7 are arranged uniformly over substantially the entire surface of the fence unit 2. Here, the silt fence 100 can increase the number of the plant units 7 provided in the fence part 2, and can improve an underwater environment and can improve an effect | action. However, the number of plant units 7 provided in the fence unit 2 is too high, the cost becomes high, and it takes time to install and replace many plant units 7, which is not always economical. Therefore, the silt fence 100 is arranged in consideration of the density and cost of the plant units 7 by adjusting the number and arrangement of the plant units 7 arranged in the fence part 2. The silt fence 100 in FIG. 3 has a plurality of plant units 7 arranged at predetermined intervals (k) in the horizontal direction. As described above, the silt fence 100 determines the number and interval (k) of the plant units 7 arranged in the horizontal direction with respect to the total length (L) of the fence unit 2 in consideration of the density and cost of the plant units. Further, the number of plant units 7 arranged in the vertical direction with respect to the vertical width (H) and the interval (k) are determined. The density at which a plurality of plant units are connected can be variously changed according to the environment of the water area where the silt fence is installed.

  Furthermore, the silt fence 100 shown in FIG. 3 is connected to the plant unit 7 at a plurality of locations on the surface of the fence portion 2 and intersecting portions 6x of the strip-shaped reinforcing sheet 6 that are attached in a lattice shape vertically and horizontally. . That is, the fence part 2 shown in the figure is arranged in a matrix over the entire surface of the fence part 2 by connecting the plant units 7 to the intersecting portions of the reinforcing sheets 6 attached in the vertical and horizontal directions. However, it is not always necessary to arrange the plurality of plant units 7 at all the intersections 6x, and the density at which the plant units 7 are arranged can be reduced by providing portions that are not connected.

  The silt fence 100 shown in FIG. 10 is a plurality of plant units 7 arranged side by side in the vertical and horizontal directions, and is shifted vertically by shifting the left and right positions of the plurality of plant units 7 arranged in a plurality of rows adjacent to each other in the vertical direction. They are alternately arranged in a staggered pattern. Similarly to this, the silt fence can be alternately arranged left and right by shifting the vertical positions of the plurality of plant units 7 arranged in a plurality of rows adjacent to the left and right. As described above, the plant units 7 arranged at a plurality of locations of the fence unit 2 realize various environments of the plant units 7 to be arranged, the vertical position, the interval, and the like, thereby realizing an optimum environment for the installation location of the silt fence. Arranged as possible.

(Embodiment 2)
Furthermore, the silt fence 200 shown in FIG. 11 has a structure in which the plants 4 arranged at a plurality of locations on the surface of the fence part 2 can be replaced. A silt fence 200 shown in FIG. 11 includes arrangement means 16 that arranges plant units 7 in a plurality of places above and below the fence unit 2 in a replaceable manner. The arrangement means 16 shown in the figure includes a string-shaped transfer wire 17 in which a plurality of plant units 7 are detachably fixed at predetermined intervals, and a pulley arranged at the lower part of the fence portion 2 and on which the transfer wire 17 is hung. 18. The transfer wire 17 is hung on the pulley 18 with the intermediate portion as a turn-up portion, and a pair of extension portions 7A and 17B extending from the turn-up portion are extended to the water surface. Further, the plurality of plant units 7 can be attached to and detached from one extension portion 17A. It is fixed to.

  The arrangement means 16 shown in FIGS. 11 and 12 uses the plant unit 7 having the plant 4 as the land plant 4b as shown in FIG. 9 as the plant unit 7 that is detachably fixed to the transfer wire 17. Show. That is, the plant unit 7 includes one or more plant pieces obtained by cutting the land plant 4b at the stem portion. The plant unit 7 shown in the drawing is obtained by bundling stem portions of a plurality of plant pieces into one with a bundling member 25, and transferring the bundled plant unit 7 via a string-like body 14 </ b> A as a connector 14. 17 is detachably connected. In the illustrated arrangement means 16, a plurality of plant units 7 are detachably fixed to one extension 17 </ b> A of a transfer wire 17 hung on a pulley 18. The plurality of plant units 7 are spaced apart in the vertical direction and fixed at a predetermined interval. This arrangement | positioning means 16 determines the number and space | interval (k) of the plant unit 7 arrange | positioned in the up-down direction in consideration of the up-and-down width (H) of the fence part 2, and cost.

  The arrangement | positioning means 16 of the figure uses the transfer wire 17 to which the some plant unit 7 is fixed as a rope. The transfer wire 17 which is a rope is disposed in water in a state where the intermediate portion is hung on the pulley 18. The transfer wire 17 in FIG. 8 extends to the water surface while connecting a plurality of plant units 7 to one extension 17A (left side in the figure) at a predetermined interval (k), and the other extension part 17B (right side in the figure). ) Extends to the surface as it is. For example, as shown in the enlarged view of FIG. 9, the transfer wire 17 that is a rope is inserted through and fixed to a connection ring 19, and a string-like body 14 </ b> A that is a connection tool 14 of the plant unit 7 is attached to the connection ring 19. It is designed to be detachable. In the arrangement means 16 shown in the drawing, the connecting ring 19 is a metal ring, but the connecting ring 19 may be formed by forming a string body fixed to a rope into a ring shape.

  As shown in FIGS. 11 and 12, the pulley 18 is fixed to the lower end portion of the fence portion 2 so as to be rotatable in a vertical plane. The pulley 18 is provided with an insertion groove 18A that guides the transfer wire 17 on the outer peripheral surface, and the fence 18 can be rotated via the rotary shaft 20 so that the transfer wire 17 guided in the insertion groove 18A can be rotated. It is fixed to the part 2. Furthermore, a pulley cover 21 having a semicircular shape in front view is provided in the lower half of the pulley 18 so that the transfer wire 17 hung on the pulley 18 does not come off from the fitting groove 18A. The pulley cover 21 allows the pulley 18 to smoothly rotate and the transfer wire 17 to be detached from the pulley 18 in a state where one extension portion 17A (17B) of the transfer wire 17 hung on the pulley 18 is pulled upward. To prevent. The pulley 18 and the pulley cover 21 are made of, for example, a metal such as stainless steel, and have a specific gravity that sinks in water by its own weight. In this way, the transfer wire 17 hung on the pulley 18 is arranged in a state of being stretched from the water surface toward the bottom of the water by the pulley 18 and the pulley cover 21 that sink in water. However, the pulley and pulley cover can be made of plastic. The structure in which the pulley and the pulley cover are made of plastic can be submerged in water by providing a weight at the lower end.

  As shown in the partially enlarged view of FIG. 12, the pulley 18 is arranged so that the rotary shaft 20 is in a horizontal posture when suspended in the water. In order to realize this, the rotating shaft 20 of the pulley 18 is suspended via a suspension band 22 as shown in the partially enlarged views of FIGS. 12 and 13. That is, the rotating shaft 20 of the pulley 18 is fixed to the fence unit 2 via the hanging band 22 without being directly fixed to the fence unit 2. In this structure, the rotating shaft 20 of the pulley 18 that falls under its own weight in water is supported by the suspension bands 22 on both sides of the pulley 18, so that the rotating shaft 20 can be reliably held in a horizontal posture.

  As the position of the pulley 18 is closer to the bottom of the water, the plant unit 7 can be transferred to a deeper position in the water and arranged. However, if the pulley 18 contacts the bottom of the water as shown in FIG. Therefore, as shown in FIG. 11, the pulley 18 is disposed at a lower portion of the fence portion 2, and preferably somewhat higher than the lower end of the fence portion 2. As shown in FIG. 12A, the fixed position of the pulley 18 is preferably a position that does not contact the seabed at least at the rising position of the sea surface at high tide or the like. The fence part 2 in FIG. 11 is a position where the pulley 18 is disposed, and the distance (t) from the lower end of the fence part 2 is set to about 1/6 of the vertical width (H) of the fence part 2. However, the position where the pulley 18 is provided can be a position where the distance (t) from the lower end of the fence part 2 is within ½, preferably within ¼ of the vertical width (H) of the fence part 2. .

  Further, in order to fix both ends of the transfer wire 17 extended to the water surface, a ring 23 is disposed near the water surface. Extension portions 17A and 17B extended from the pulley 18 to the water surface are inserted into the ring 23 near the water surface. The ring 23 shown in FIG. 11 is substantially circular. One end of the ring 23 is connected to the upper end of the fence portion 2 or the float portion 1, and the positions of both end portions of the transfer wire 17 are moved by inserting and connecting the upper end of the transfer wire 17 to the ring 23. It can be managed while grasping. Both ends of the transfer wire 17 can be fixed to the ring, for example, by being tied to the ring or via a connector (not shown).

  In the above arrangement means, when the plant 4 is replaced, the plant unit 7 can be easily removed by pulling upward the extension portion 17A to which the plurality of plant units 7 are fixed and pulling the plant unit 7 to the surface of the water. Can be exchanged. Also, after replacing the plant unit 7 with a new one, the extension unit 17B on the side to which the plant unit 7 is not fixed is pulled upward, so that the extension unit 17A on the side to which the plant unit 7 is fixed is submerged in water. The plant unit 7 can be placed at a fixed position in water. In addition, when exchanging the plant unit 7 as described above, as shown in FIG. 12A, at the timing when the sea level is at the rising position such as at high tide, at least the pulley 18 contacts the bottom of the water. It is preferable to carry out in the state which is not.

(Embodiment 3)
Furthermore, the silt fence 300 shown in FIG. 13 includes an air supply device 8 that supplies air to the plants 4 arranged in the fence portion 2. The air supply device 8 shown in the figure is disposed at the lower part of the fence unit 2 and has a bubble generating unit 61 that discharges the supplied air as bubbles, and air that supplies air to the bubble generating unit 61 via an air supply hose 62. And a supply pump 63.

  In the silt fence 300 of FIG. 13, the bubble generating part 61 is arranged at the center of the lower end part of the fence part. The bubble generating part 61 shown in the figure is in the form of a bar extended in the left-right direction so that the bubbles can be discharged in a wide area in the left-right direction, which is the length direction of the fence part 2. The bubble generating unit 61 is connected to an air supply pump 63 via an air supply hose 62. The air supply hose 62 is extended from the lower end of the fence part 2 to the float part 1 and further extended from the water surface to the land, and is extended to the air supply pump 63 disposed on the land. The above air supply device 8 drives the air supply pump 63 to supply air to the bubble generation unit 61, thereby allowing the bubbles discharged from the bubble generation unit disposed below the fence unit 2 to be discharged from the fence unit. 2 can be supplied to the plant 4 arranged in 2. Thereby, a large amount of oxygen can be supplied to the plant 4 arranged in the fence part 2 and the aquatic animal that inhabits the plant 4 as a hideout. Thereby, the living environment of the aquatic animal in the vicinity of the fence part 2 can be made still better.

(Embodiment 4)
Furthermore, the silt fence 400 shown in FIG. 14 includes a light emitting device 9 that emits light from the float unit 1 floating on the water surface. The light emitting device 9 shown in the figure includes a light emitting element 65 built in the float unit 1, a power supply unit 66 that supplies power to the light emitting element 65, and a control unit 67 that controls the light emitting state of the light emitting element 65.

  The float unit 1 has a structure that allows the light emitted from the built-in light-emitting element 65 to be transmitted to the outside by using the cover 12 that covers the periphery of the floating member 11 as a translucent member. The float portion 1 shown in the figure has a spherical floating member 11 built in the cover portion 12, and a plurality of spherical floating members 11 (four in the figure) are arranged in a row and stored in the cover portion 12. .

  The light emitting element 65 is an LED, and a plurality of LEDs are arranged in the arrangement direction of the spherical floating members 11. In the light-emitting device 9 shown in the drawing, the LED that is the light-emitting element 65 is disposed inside the cover portion 12 and on the surface of the floating member 11. The light emitting element 65 built in the float unit 1 is supplied with power from the power supply unit 66 via the power supply line 68. The power supply line 68 is drawn from the cover portion 12 in a watertight manner, and is extended from the water surface to the land, and is wired to a power supply portion 66 disposed on the land. The power supply unit 66 supplies power to the light emitting element 65 to cause the light emitting element 65 to emit light. The power supply unit 66 can be a commercial power supply, but can also be a power supply device that combines a solar battery and a rechargeable battery.

  The light-emitting device 9 shown in the figure includes a control unit 67 that controls the light emission pattern of the light-emitting element 65, and supplies power supplied from the power supply unit 66 to the light-emitting element 65 under a predetermined condition. The structure is made to emit light. The light emitting device 9 stores, for example, a time period when the surroundings are dark, or when the sensor senses that the surroundings are dark, it supplies power to the light emitting elements 65 to cause the light emitting elements 65 to emit light. In such a nighttime when the surroundings are dark, the light emitting element 65 built in the float unit 1 emits light so that the position of the float unit 1 can be notified to the surroundings, and the ship passing through the vicinity of the silt fence 400 can be notified. The existence can be clearly displayed, and the safety of the surrounding water area at night can be secured. Further, although not shown, the light emitting device can be arranged to form a character string with a plurality of light emitting elements, or a plurality of light emitting elements can be arranged in a panel shape to display a specific character. This light-emitting device can convey the information of the construction site to the surroundings by displaying the name of the company that performs the construction or displaying the construction period.

  The silt fence of the present invention prevents the pollution generated by construction from spreading to the outside water area in coastal areas such as seas, rivers, lakes, ponds, dams, and the surrounding water areas of civil engineering works. As a silt fence that can improve the underwater environment of the water area outside the polluted area, it can be suitably used at the site of civil engineering work such as the coast and the bottom of the water.

DESCRIPTION OF SYMBOLS 100, 200, 300, 400 ... Silt fence 1 ... Float part 2 ... Fence part 3 ... Weight part 4 ... Plant 4a ... Aquatic plant 4b ... Land plant 5 ... Sheet material 6 ... Reinforcement sheet 6x ... Crossing part 7 ... Plant unit 8 ... Air supply device 9 ... Light emitting device 10 ... Fence unit 11 ... Floating member 12 ... Cover part 13 ... Connecting part 14 ... Connecting tool 14A ... String-like body 15 ... Fixing tool 16 ... Arrangement means 17 ... Transfer wire 17A ... Extension part 17B ... extension 18 ... pulley 18A ... insertion groove 19 ... coupling ring 20 ... rotating shaft 21 ... pulley cover 22 ... suspension band 23 ... ring 24 ... settlement member 24A ... plastic foam 24B ... rock 24C ... wood 25 ... binding member 26 ... Storage member 26A ... Pot 26B ... Tube 31 ... Sub float 32 ... Anchor 33 ... Connecting wire 34 ... Anchor wire 51 ... Construction area 5 ... pollution water 53 ... outer water 61 ... bubble generating portion 62 ... air supply hose 63 ... air supply pump 65 ... light-emitting element 66 ... power supply unit 67 ... controller 68 ... power supply line

Claims (10)

A float that floats on the water,
A fence part connected to the lower part of the float part;
A weight portion fixed to a lower end of the fence portion;
A silt fence comprising:
The fence part is composed of a flexible sheet material, and plants are arranged at a plurality of locations on the surface of the fence part. A silt fence according to claim 1,
The silt fence which the said fence part makes the external appearance of the surface where the said plant is arrange | positioned green. A silt fence according to claim 1 or 2,
A silt in which the plant is arranged as a plant unit comprising one or more strains of individuals, or a plant unit comprising one or more plant pieces, interchangeably on the surface of the fence part via a connector. fence. A silt fence according to claim 3,
The silt fence, wherein the plant is an aquatic plant, and the plant unit includes an aggregating member for causing the aquatic plant to grow. A silt fence according to claim 3,
The silt fence which the said plant is a land plant and cuts the said land plant with a stem and becomes a plant piece. A silt fence according to any one of claims 3 to 5,
The fence part is a silt fence in which the surface of the sheet material is reinforced by a plurality of strip-shaped reinforcing sheets, and the plant units are connected to the reinforcing sheet. A silt fence according to claim 6,
The silt fence which the said reinforcement sheet | seat is attached to the surface of the said sheet | seat material at the grid | lattice form up and down, left and right, has reinforced the said sheet | seat material, and connects the said plant unit to the intersection of this reinforcement sheet | seat. A silt fence according to any one of claims 1 to 7,
A silt fence in which the plant is arranged from the upper part to the lower part of the fence part.
With the above configuration, since the plants are arranged from the upper part to the lower part of the fence part, it is possible to improve the living environment of various aquatic animals over a wide range from aquatic animals that inhabit the water bottom to aquatic animals that inhabit the water surface. The silt fence according to any one of claims 1 to 8, further comprising:
An air supply device for supplying air to the plant arranged in the fence part;
The air supply device is
A bubble generating part that is arranged at the lower part of the fence part and discharges the supplied air as bubbles,
An air supply pump for supplying air to the bubble generating part via an air supply hose,
A silt fence configured to supply bubbles discharged from the bubble generation unit to the plant. The silt fence according to any one of claims 1 to 9, further comprising:
A light emitting means for emitting light from the float part;
The light emitting means is
An LED built in the float part;
A power supply for supplying power to the LED;
A control unit for controlling the light emission state of the LED,
The float part is
A silt fence made of a light-transmitting member as a cover that covers the periphery of a floating member, and transmitting light emitted from the built-in LED to the outside.

Images