Artificial reef, basket member, and method for installing artificial reef

Abstract

To provide an artificial fishing bank capable of assisting the inhabitation of marine plants and fishes.SOLUTION: The artificial fish reef 1 according to the present embodiment includes a first basket member 10 having a rectangular parallelepiped shape and formed of a metal net member, a second basket member 10 having a rectangular parallelepiped shape and formed of a metal net member, the second basket member 10 being stacked on the first basket member 10 so as to intersect the first basket member 10, and a filling member 40 filling the first basket member 10 and the second basket member 10. The first basket member 10 or the second basket member 10 has a first filling area 102A, a second filling area 102B, and a third filling area 102C filled with the filling member 40, and these are areas located at different positions. The filling factor of the filling member 40 in the second filling region 102A is lower than the filling factor of the filling member 40 in the first filling region 102C and the third filling region 102B. In a state in which the second basket member 10 is stacked on the first basket member 10, the first filling region 102A and the third filling region 102C in the second basket member 10 are supported by the first basket member 10.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an artificial reef, a cage member, and a method for installing an artificial reef. [Background technology]

[0002] For example, Patent Document 1 discloses a lattice-type assembled fish reef in which a number of rod-shaped members of appropriate lengths are assembled into a lattice-shaped hollow cube, and the four corners are fixed to form a fish reef. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-142603 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide an artificial reef that can support the habitat of marine plants and fish. [Means for solving the problem]

[0005] The artificial fishing reef according to the present invention comprises a first cage member having a rectangular parallelepiped shape formed by a net member; The stacking device comprises a second cage member in the shape of a rectangular parallelepiped formed from a mesh member, which is installed crosswise and stacked on the first cage member; filler members filled in the first cage member and the second cage member; a first filling area contained in the second cage member and filled with the filler members; and a second filling area contained in the second cage member, located at a position different from the first filling area, and filled with the filler members; when the second cage member is stacked on the first cage member, the first filling area is supported by the first cage member, and the filling rate of the filler members in the second filling area of ​​the second cage member is lower than the filling rate of the filler members in the first filling area.

[0006] Preferably, the first cage member and the second cage member are stacked in a grid shape with a space in the center, and the second cage member has the first filling area located on both sides of the second filling area.

[0007] The stacker further includes a connecting member that connects the first cage member and the second cage member when the first cage member and the second cage member are stacked, and the connecting member includes an insert member that is a rod or tube, and a receiving member that is provided on the first cage member or the second cage member and receives the insert member.

[0008] Preferably, the filling member includes a porous member which is a roof tile or crushed roof tile, and the first cage member and the second cage member are formed by a mesh member having a mesh size that does not allow the filling member to pass through.

[0009] Furthermore, the basket member according to the present invention comprises a basket body having a rectangular parallelepiped shape formed from a mesh member, a filler member filled in the basket body, a first filling area contained in the basket body and filled with the filler member, and a second filling area contained in the basket body, located at a position different from the first filling area, and filled with the filler member, and the filler member is filled in the first filling area or the second filling area.

[0010] In addition, the method for installing an artificial fishing reef according to the present invention comprises a first filling step of filling a first cage member having a rectangular parallelepiped shape formed from a net member with filler members; a second filling step of filling a first filling area and a second filling area located in a different position from the first filling area of ​​a second cage member having a rectangular parallelepiped shape formed from a net member with the filler members; and a step of installing the second cage member in a cross-stacked state on the first cage member so that the first filling area of ​​the second cage member is supported by the first cage member, and in the second filling step, the filler members are filled so that the filling rate of the filler members in the second filling area is lower than that in the first filling area. [Effects of the Invention]

[0011] According to the present invention, it is possible to support the habitat of marine plants and fish. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view illustrating an artificial reef 1 according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the artificial reef 1 illustrated in FIG. [Figure 3] 2 is a diagram illustrating the configuration of the cage member 10 in detail. FIG. [Figure 4] FIG. 2 is a diagram illustrating the size of the cage member 10. [Figure 5] 10 is a flowchart illustrating a method for installing an artificial reef 1 in this embodiment. [Figure 6] 1A to 1C are diagrams illustrating a method for installing an artificial reef 1 in this embodiment. [Figure 7] 1 is a diagram illustrating a first modified example of the artificial reef 1 of the present embodiment. [Figure 8] 10 is a diagram illustrating a second modified example of the artificial reef 1 of the present embodiment. FIG. [Figure 9] FIG. 10 is a diagram illustrating a third modified example of the artificial reef 1 of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited to the illustrated examples. First, the configuration of the artificial reef 1 in this embodiment will be described. Fig. 1 is a perspective view illustrating an artificial reef 1 according to this embodiment. Fig. 1(A) is a perspective view of the artificial reef 1, and Fig. 1(B) is a plan view of the artificial reef 1. FIG. 2 is a side view of the artificial reef 1 illustrated in FIG. As illustrated in Figures 1 and 2, the artificial reef 1 in this embodiment is installed on a flat or gently sloping seabed. The artificial reef 1 is an artificially constructed fish reef, for example, made by stacking cage members, each of which has a long, rectangular shape, in multiple layers. The artificial reef 1 is installed, for example, using a polygonal stacking method, and more specifically, using triangular, square, pentagonal, hexagonal, or octagonal stacking. The artificial reef 1 in this example is installed using a square stacking method. The artificial reef 1 has cage members 10, cage units 20, connecting members 30, and filler members 40.

[0014] The cage member 10 is a basic member that constitutes the main body of the artificial reef 1, and is a rectangular parallelepiped member made of a metal netting material. The cage member 10 in this example is, for example, an iron futon basket (square gabion). Details of the cage member 10 will be described later. The basket members 10 are stacked in pairs, spaced apart and parallel to one another, in multiple stages in the stacking direction. The basket members 10 are installed by stacking a first basket member with a second basket member intersecting the first basket member. For example, the basket member 10 of basket unit 20A is installed by stacking a second basket member intersecting the first basket member. That is, the basket members 10 are stacked so that two adjacent basket members 10 in the stacking direction intersect. For ease of explanation, units of pairs of basket members 10 are referred to as basket units 20A-20F in order from bottom to top in the stacking direction. The basket units 20A-20F have substantially the same configuration, and will be simply referred to as basket units 20 unless there is a need to distinguish them. Furthermore, the basket members 10 constituting the basket units 20A-20F have substantially the same configuration. Cage units 20A, 20C, and 20E and cage units 20B, 20D, and 20F are stacked while rotated 90 degrees relative to each other, and are installed to form a grid or rectangular shape with a space in the center. Note that cage member 10 is an example of the first cage member and second cage member according to the present invention.

[0015] The connecting member 30 is one example of a connecting member according to the present invention, and is a connecting member that connects multiple basket members 10 that are stacked together. The connecting member 30 may connect two basket members 10 in the stacking direction, or may connect three or more basket members 10. The connecting member 30 of this example connects all of the basket members 10 of the stacked basket units 20A to 20F in the stacking direction. The connecting member 30 includes an inserting member 300 and a receiving member 302. The insert member 300 is an example of an insert member according to the present invention, and is a rod or tube made of metal or synthetic resin that connects and fastens at least two stacked cage members 10 to prevent misalignment. The insert member 300 in this example is an iron tube that is inserted into each receiving member 302 of the stacked cage units 20A to 20F, connecting all of the cage members 10 together in the stacking direction. The insert member 300 may be plated, painted, or unpainted, but is preferably unpainted from the perspective of dissolving iron ions in seawater.

[0016] The insert member 300 may have flat ends or may have one end pointed. When the insert member 300 is installed by piercing and driving it into the installation surface, it is formed with one end pointed. The insert member 300 is arranged in a position close to or adjacent to the side of the two basket members 10 at part A where two basket members 10 adjacent in the stacking direction intersect, as illustrated in FIG. 1B. The insert members 300 in this example are located, for example, on both sides of the basket member 10 of basket unit 20F and on both sides of the basket member 10 of basket unit 20E, and are arranged adjacent to the side of the two basket members 10. Therefore, the insert members 300 are arranged in four locations at part A where two basket members 10 adjacent in the stacking direction intersect, as illustrated in FIG. 1B. The number of insert members 300 is not limited to four, and they may be arranged in only one location.

[0017] The receiving member 302 is an example of a receiving member according to the present invention, and is a member that is provided on the basket member 10 and receives the insert member 300. The receiving member 302 is, for example, a frame member that is large enough to allow the insert member 300 to be inserted therein. The receiving members 302 in this example are provided on each of two side surfaces located in the width direction of the basket member 10. Furthermore, the receiving members 302 provided on each basket member 10 of the basket units 20A to 20F are placed in positions where multiple receiving members 302 overlap in the stacking direction in a plan view, from the perspective of allowing the insert member 300 to be inserted therein. Furthermore, the receiving members 302 function as hanging hardware when the basket member 10 is suspended.

[0018] The filler member 40 is an example of a filler member according to the present invention and is a member to be filled inside the basket member 10. For example, the filler member 40 is made of steel slag, natural stone, crushed stone, or a porous material. In this example, the filler member 40 is a porous material, such as bricks, roof tiles, waste roof tiles, or crushed bricks or roof tiles. The filler member 40 in this example is waste roof tiles or crushed roof tiles. The filler member 40 may also be filled in a mesh bag made of a synthetic resin such as polyester. For example, the filler member 40 may be crushed roof tiles filled in a mesh bag with a mesh size large enough to prevent the crushed roof tiles from passing through. The filler member 40 may also be filled in a region of the filling region of the basket member 10, with a short-fiber nonwoven fabric such as a synthetic fiber nonwoven fabric arranged inside the filling region, and at least the bottom and side surfaces surrounded by the short-fiber nonwoven fabric. In addition, the filler member 40 may be filled in an area in the filling region of the basket member 10, the area being surrounded at least on the bottom and sides by a wire mesh with a mesh size that is large enough that the filler member 40 cannot pass through, or by a punched metal with holes that are large enough that the filler member 40 cannot pass through.

[0019] 3A and 3B are diagrams illustrating in detail the configuration of the basket member 10. Fig. 3A is a diagram illustrating the configuration of the basket member 10, and Fig. 3B is a perspective view of the basket unit 20. As shown in FIG. 3(A), the basket member 10 includes a basket body 100 and a partition portion 104. The basket body 100 is an example of a basket body according to the present invention, and is made of metal or synthetic resin, and is a rectangular parallelepiped basket formed of tortoiseshell-shaped or lattice-shaped mesh members. If the basket body 100 is made of metal, it is made of, for example, iron, and if it is made of synthetic resin, it is made of, for example, fiber-reinforced plastic (FRP) or synthetic resin such as polyester. Furthermore, if the cage body 100 is made of metal, it may be coated, plated, or painted to enhance durability, for example, it may be coated with a ceramic coating material mainly composed of bisphenol A epoxy resin in an amount of 80% or more by weight, or it may be coated with aluminum zinc plating. Furthermore, the cage body 100 may be unpainted to allow iron ions to dissolve in seawater. Furthermore, the cage body 100 may be configured, for example, such that the mesh members are integrally provided on a framework primarily made of round steel bars, or such that the mesh members are integrally provided on a framework primarily made of shaped steel such as H-beam bars. The cage body 100 of this example is configured such that the mesh members are provided on a framework primarily made of round steel bars. The cage body 100 is a cage formed from mesh members formed in a lattice pattern from rod material having a diameter of 6 mm to 22 mm, specifically, a diameter of 6 mm to 16 mm. The basket body 100 is formed of a mesh member having a mesh size that prevents the filling member 40 from passing through. For example, the basket body 100 has mesh of 4 cm to 20 cm, specifically 10 cm to 15 cm, and in this example, the basket body 100 has mesh of 10 cm x 10 cm. Furthermore, in the filling area of ​​the basket member 10, the basket body 100 may have short fiber nonwoven fabric such as synthetic fiber nonwoven fabric disposed at least on the bottom and side surfaces. The short fiber nonwoven fabric disposed may have a density of, for example, 550 to 3800 g / m 2 Specifically, 800 to 2000 g / m 2 , more specifically, 900 to 1500 g / m 2 Furthermore, in the filling region of the cage body 100 where the filler members 40 are filled, a wire mesh with mesh that is large enough that the filler members 40 cannot pass through, or a punched metal with holes that are large enough that the filler members 40 cannot pass through, may be arranged on at least the bottom and side surfaces. The interior of the cage body 100 is divided by partitions 104, which will be described later, and includes a first filling area 102A, a second filling area 102B, and a third filling area 102C. The three filling areas 102 are located in different positions, and in this example, the three filling areas 102 are provided adjacent to each other in the longitudinal direction of the cage body 100. Specifically, the second filling area 102B is located in the center of the cage body 100, and the first filling area 102A and the third filling area 102C are located on both sides of the cage body 100. Specifically, the first filling region 102A is adjacent to the second filling region 102B, the second filling region 102B is adjacent to the first filling region 102A and the third filling region 102C, and the third filling region 102C is adjacent to the second filling region 102B. In other words, the first filling region 102A and the third filling region 102C are located on both sides of the second filling region 102B.

[0020] Furthermore, the cage body 100 may fill all or at least some of the first filling region 102A, the second filling region 102B, and the third filling region 102C with the filler members 40. For example, the cage body 100 may fill the first filling region 102A and the third filling region 102C with the filler members 40 at a ratio of 70% to 99%, specifically 80% to 99%, and the cage body 100 may fill the second filling region 102B with the filler members 40 at a ratio of 0% to 50%, specifically 0% to 25%. In the cage body 100 of this example, the first filling area 102A and the third filling area 102C located on both sides of the second filling area 102B are filled with filler members 40 at a ratio of 90% to 95%, and the second filling area 102B is filled with filler members 40 at a ratio of 0% to 10%. In other words, the second cage member 10B has a lower filling rate than the filling rate of the filler members 40 in the first filling area 102A or the third filling area 102C. The first filling area 102A and the third filling area 102C are examples of the first filling area according to the present invention, and the second filling area 102B is an example of the second filling area according to the present invention.

[0021] The partition 104 is made of metal and is formed of a tortoiseshell-shaped or lattice-shaped mesh member, and is a partition member that divides the internal space of the basket body 100. The partition 104 divides the internal space of the basket body 100 into a central portion and both sides thereof, thereby forming a first filling area 102A, a second filling area 102B, and a third filling area 102C. The partition 104 is provided between the first filling area 102A and the second filling area 102B, and between the second filling area 102B and the third filling area 102C. The partition 104 is formed of a mesh member with mesh sizes that do not allow the filler member 40 to pass through.

[0022] 3(B), the basket member 10 includes a first basket member 10A and a second basket member 10B that is stacked on the first basket member 10A in an orientation rotated approximately 90 degrees from the orientation of the first basket member 10. The first basket member 10A and the second basket member 10B are stacked in the shape of a grid with a space in the center. The second cage member 10B has the first filling region 102A and the third filling region 102C filled with filler materials 40, and the second filling region 102B is unfilled with filler materials 40. In addition, when the second cage member 10B is stacked on the first cage member 10, the first filling region 102A and the third filling region 102C of the second cage member 10B are supported by the first cage member 10. The first cage member 10A is an example of a first cage member according to the present invention, and the second cage member 10B is an example of a second cage member according to the present invention.

[0023] FIG. 4 is a diagram illustrating the size of the basket member 10. As shown in FIG. As illustrated in FIG. 4, the length L of the cage member 10 is, for example, 3 m to 10 m, specifically 5 m to 8 m. The height H of the cage member 10 is, for example, 30 cm to 70 cm, specifically 40 cm to 60 cm, and more specifically 50 cm. The width W of the cage member 10 is, for example, 100 cm to 140 cm, specifically 110 cm to 130 cm, and more specifically 120 cm. The distance B between the two receiving members 302 is a distance that accommodates the width W of the cage member 10, for example, 100 cm to 140 cm, specifically 110 cm to 130 cm, and more specifically approximately 120 cm. The separation distance D between the two cage members 10 arranged in parallel and spaced apart is, for example, 0.5 m to 3 m, specifically 0.6 m to 2.8 m. More specifically, the separation distance D is 0.6 m when the length L of the cage member 10 is 5 m, 1.6 m when the length L of the cage member 10 is 6 m, 2.6 m when the length L of the cage member 10 is 7 m, and 2.6 m when the length L of the cage member 10 is 8 m.

[0024] Next, a method for installing the artificial reef 1 in this embodiment will be described. FIG. 5 is a flowchart illustrating a method for installing the artificial reef 1 in this embodiment. FIG. 6 is a diagram illustrating a method for installing the artificial reef 1 in this embodiment. As an example, the operations in steps S100 to S106 illustrated in FIG. 5 will be described below with reference to FIG. An overview of the installation method for the artificial reef 1 will be explained with reference to Figure 3. When filling the first cage member 10A and the second cage member 10B, which are rectangular parallelepiped shapes formed from metal mesh members, with filler materials, the filling rate of the filler materials 40 in the second filling area 102B is set lower than that in the first filling area 102A and the third filling area 102C (steps S100 and 102). When stacking the second cage member 10B on the first cage member 10, the second cage member 10B is installed by stacking it crosswise on the first cage member 10A so that the first filling area 102A and the third filling area 102C of the second cage member 10B are supported (step S104). The stacked first cage member 10 and second cage member 10B are connected by connecting members 30 (step S106), and the artificial reef 1 is installed.

[0025] As illustrated in Fig. 5, in step 100 (S100), a worker produces, for example, each cage member 10 of cage units 20A, 20C, and 20E. The worker fills a cage body 100, which has a rectangular parallelepiped shape and is formed from a metal mesh member, with filler members 40. At this time, the worker may fill the cage body 100 with filler members 40 that have been previously filled in mesh bags. This makes it possible to prevent the filler members 40 from scattering in the sea even if the cage body 100 decays. The worker fills the first filling area 102A and the third filling area 102C of the basket body 102 with filler members 40 so that the filling rate is 90% or more and 95% or less, and fills the second filling area 102B with filler members 40 so that the filling rate is 0% or more and 10% or less. In other words, the worker fills the second filling area 102B with filler members 40 so that the filling rate is lower than the filling rate in the first filling area 102A and the third filling area 102C. This prevents the second filling area 102B from sagging due to the weight of the filler members 40 when the basket members 10 are stacked. The worker then closes the lid of the basket body 102 and obtains the basket member 10.

[0026] In step 102 (S102), a worker fabricates each of the basket members 10 of the basket units 20B, 20D, and 20F, for example. The worker fills the basket body 100, which has a rectangular parallelepiped shape and is formed from a metal mesh member, with filler members 40. The worker fills the first filling area 102A and the third filling area 102C of the basket body 102 with filler members 40 at a ratio of 90% to 95%, and fills the second filling area 102B with filler members 40 at a ratio of 0% to 10%. In other words, the filler members 40 are filled so that the filling rate of the second filling area 102B is lower than the filling rate of the first filling area 102A and the third filling area 102C. This prevents the second filling area 102B from sagging due to the weight of the filler members 40 when the basket members 10 are stacked. Thereafter, the worker closes the lid of the basket body 102 to obtain the basket member 10. The order of the work steps S100 and S102 can be changed.

[0027] In step 104 (S104), the worker places a lifting jig between the lifting hook of the working crane vehicle and the cage member 10, and lifts the cage member 10 using the crane vehicle. The worker uses the crane vehicle to lift the cage member 10 with the lifting tool connected to the reception member 302 of the cage member 10. The worker then transports the lifted cage member 10 to the seabed and installs it in a predetermined position. As shown in Fig. 6(A), the worker places a pair of cage members 10 in parallel and spaced apart on the seabed underwater (installation of cage unit 20A). Next, the worker stacks the pair of cage members 10 in parallel and spaced apart on cage unit 20A in an orientation rotated about 90° from the orientation of the installed cage unit 20A (installation of cage unit 20B). At this time, the worker stacks both sides of the cage members 10 of cage unit 20B, i.e., positions corresponding to the first filling area 102A and the third filling area 102C filled with filler members 40, on the cage members 10 of cage unit 20A. That is, the cage member 10 of cage unit 20B is installed in a cross-stacked state on the cage member 10 of cage unit 20A so that the first filling area 102A and the third filling area 102C of the cage member 10 of cage unit 20B are supported by the cage member 10 of cage unit 20A. Then, the worker repeats the stacking work for the remaining basket units 20C to 20F. Note that the explanation of the stacking work process for the basket units 20C to 20F overlaps with the explanation of the stacking work process for the units 20A and 20B, so the explanation will be omitted. In this way, the worker can stack the basket units 20A to 20F exemplified in Figures 1 and 2.

[0028] In step 106 (S106), the worker connects the stacked basket members 10 using the connecting members 30, as illustrated in FIG. 6(B). Specifically, the worker inserts an insert member 300 into each receiving member 302 of the stacked basket members 10, connecting and stabilizing the stacked basket members 10. If the insert member 300 has both flat ends, the worker positions the flat end so that it contacts the installation surface. If the insert member 300 has one pointed end, the worker drives the pointed end into the installation surface to secure the insert member 300 to the installation surface. Although the case where the insertion member 300 is inserted into the receiving member 302 after all the cage members 10 have been stacked has been described, this is not limited to this. After the cage unit 20A is installed on the seabed, the insertion member 300 may be inserted into the receiving member 302 of the cage unit 20A, and the cage units 20B to 20F may then be stacked and installed while passing each of the receiving members 302 through the inserted insertion member 300.

[0029] As explained above, the artificial reef 1 of this embodiment employs a cage member 10 including a first filled area 102A and a third filled area 102C filled with waste tiles, which are porous materials, as filler materials 40, and a second filled area 102B that is unfilled or only lightly filled with filler materials 40. This allows the second filled area 102B to serve as a habitat for fish, and is expected to encourage the attachment and proliferation of marine plants such as plankton and seaweed in the first filled area 102A and the third filled area 102C. Furthermore, the waste tiles can be recycled as inorganic porous materials. Furthermore, in the artificial fish reef 1, when a plurality of cage members 10 are stacked, the filling areas of the stacked cage members 10 corresponding to the positions that are supported are filled with filler members 40, and the filling areas corresponding to the positions that are not supported are not filled with filler members 40 or the amount of filler members 40 is reduced, thereby making it possible to suppress deformation of the cage body 100 of the cage member 10. Furthermore, from the viewpoint of underwater installation work, the artificial reef 1 can be efficiently connected by inserting the insertion member 300 into the receiving member 302 of the stacked basket members 10 and connecting them.

[0030] Next, a modification of the above embodiment will be described. In the modified example, elements having substantially the same functions and configurations as those in the above embodiment are designated by the same reference numerals, and redundant explanations will be omitted. [Variation 1] In the above embodiment, the artificial fish reef 1 is described as having a lattice shape with the basket member 10 protruding, but in this example, the artificial fish reef 1 is described as having a quadrangular shape. Figure 7 is a diagram illustrating a first modified example of the artificial reef 1 of this embodiment. Figure 7(A) is a diagram illustrating the artificial reef 1 in the first modified example, Figure 7(B) is a diagram illustrating the cage member 10 of the cage unit 20F, and Figure 7(C) is a diagram illustrating the cage member 10 of the cage units 20A to 20E. As illustrated in Figure 7, the artificial reef 1 of this example has a cage member 10, cage units 20, connecting members 30, and filler members 40. For ease of explanation, the connecting members 30 are not shown. The cage units 20 are installed by alternately stacking first cage units, such as cage units 20A, 20C, and 20F, and second cage units, such as cage units 20B, 20F, and 20E, which are obtained by rotating the orientation of the first cage units by about 90 degrees, to form a quadrangle with a space in the center.

[0031] Moreover, like the cage member 10 described in the above embodiment, the cage member 10 in the cage unit 20F fills only the first filling region 102A and the third filling region 102C with the filler members 40. Moreover, the cage units 20A to 20E fill the second filling region 102B with the filler members 40 in addition to the first filling region 102A and the third filling region 102C.

[0032] Thus, according to the artificial reef 1 of this example, in the cage member 10 located at the top tier, by filling the first filling area 102A and the third filling area 102C with filler member 40, downward warping deformation in the central part of the cage member 10 located at the top tier can be prevented.

[0033] [Variation 2] In the above embodiment, a cage member 10 including a first filling area 102A and a third filling area 102C filled with filler members 40, and a second filling area 102B that is not filled with filler members 40 or has a small amount of filler member 40, is used as the cage member 10 of a polygonally stacked artificial fishing reef. However, this is not limited to this, and a cage member 10 in which the filling amounts of the first filling area 102A and the third filling area 102C and the filling area 102B are reversed may also be used as an artificial fishing reef consisting of a cage member 10 alone. FIG. 8 is a diagram illustrating a second modification of the artificial reef 1 of this embodiment. 8, the cage member 10 is configured such that the second filling region 102B located in the center is filled with filler members 40, and the first filling region 102A or the third filling region 102C located on either side thereof are not filled with filler members 40 or are filled with less filler members 40 than the second filling region 102B. In this example, the cage member 10 leaves the first filling region 102A and the third filling region 102C unfilled with filler members 40, and fills the second filling region 102B with filler members 40. Therefore, in the cage member 10, the filling rate of the filler members 40 in the second filling region 102B is higher than the filling rate of the first filling region 102A or the third filling region 102C. Furthermore, the first filling area 102A and the third filling area 102C may have the same mesh size, or may have different mesh sizes depending on the size of the target fish. This allows the cage member 10 to be lifted at its central position, improving workability during installation. Also, the cage member 10 can function as an artificial fishing reef by itself.

[0034] [Variation 3] Fig. 9 is a diagram illustrating a third modification of the artificial reef 1 of this embodiment. Fig. 9 is a perspective view illustrating the artificial reef 1 installed on a sloping surface of the seabed, and Fig. 9 is a side view illustrating the artificial reef 1 installed on a sloping surface of the seabed. As shown in Figure 9, the artificial reef 1 can be installed in a lattice pattern on land with a sloping seabed. This eliminates the need to level the sloping sea surface and makes use of the natural topography. Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications and additions can be made without departing from the spirit of the invention. [Explanation of symbols]

[0035] 1 Artificial reef 10 Basket parts 100 Basket body 102 Partition 102A First filling area 102B Second filling area 102C Third filling area 20 Cage Unit 30 Connecting member 300 Insert 302 Reception parts 40 Filling material

Claims

1. a first cage member having a rectangular parallelepiped shape formed by a mesh member; a second cage member having a rectangular parallelepiped shape formed of a mesh member and installed so as to intersect and stack on the first cage member; a filler member filled in the first cage member and the second cage member; a first filling region included in the second cage member and filled with the filler member; a second filling region included in the second cage member, located at a position different from the first filling region, and filled with the filler member; and When the second cage member is stacked on the first cage member, the first filling region is supported by the first cage member, The second cage member has a filling rate of the filler members in the second filling region lower than a filling rate of the filler members in the first filling region. Artificial fishing reef.

2. The first cage member and the second cage member are stacked in a grid shape with a space in the center, The second cage member has the first filling area positioned on both sides of the second filling area. The artificial fishing reef according to claim 1.

3. a connecting member that connects the first cage member and the second cage member in a state in which the first cage member and the second cage member are stacked together; and The connecting member is an insert member that is a rod or a tube; a receiving member provided on the first cage member or the second cage member, which receives the insertion member; 3. The artificial reef of claim 2, comprising:

4. The filling member includes a porous member that is a roof tile or a crushed roof tile, The first cage member and the second cage member are formed of mesh members having a mesh size that prevents the filling member from passing through. The artificial fishing reef according to claim 3.

5. a basket body having a rectangular parallelepiped shape formed by a mesh member; a filler member filled in the basket body; a first filling region included in the cage body and into which the filler member is filled; a second filling region included in the cage body, located at a position different from the first filling region, and filled with the filler material; and The filler material is filled in the first filling region or the second filling region. Basket parts.

6. a first filling step of filling a first basket member having a rectangular parallelepiped shape formed by a mesh member with a filler member; a second filling step of filling the filler material into a first filling region and a second filling region located at a position different from the first filling region of a second cage member having a rectangular parallelepiped shape formed of a mesh member; placing the second cage member in a cross-stacked state on the first cage member such that the first filling region of the second cage member is supported by the first cage member; and In the second filling step, the filling material is filled so that the filling rate of the filler material in the second filling region is lower than the filling rate of the filler material in the first filling region. How to install artificial reefs.

Images