JPH10191827A - Artificial fish reef - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a spherical artificial fish reef. SOLUTION: An artificial fish reef 2 for fish is composed of a concrete bottom plate 4 formed in the shape of loop plate, concrete wall 6 formed in the shape of projecting semispherical surface above the concrete bottom plate 4, and plural openings 8 formed on the concrete wall 6, etc. Concerning the concrete wall 6, the full peripheral edge of film body 10 to be made semispherical while being expanded is circularly attached to the surface of concrete bottom plate 4, a cable 16 to be made semispherical while being expanded away from the concrete bottom plate 4 is attached to the outside, air is pressurized into a space 12 inside the film body 10, an upward projecting semispherical shape is formed from the cable 16 and the film body 10, a spacer 18 is interposed between the cable 16 and the film body 10, an iron wire net 24 is installed outside the cable 16, and this fish reef is formed by blowing concrete onto the outer surface of film body 10 while keeping a high pressure state inside the space 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial reef installed on the seabed or riverbed, and more particularly, to a hemispherical artificial reef which can be manufactured at a low cost.

[0002]

2. Description of the Related Art Conventionally, hollow concrete blocks have been used as artificial fish reefs installed on the seabed or riverbed, and a plurality of openings are formed in the wall surface of the concrete block so that fish can enter and exit the concrete block. I have. Conventionally, this type of concrete block is manufactured by assembling a concrete formwork using a support, pouring concrete into the concrete formwork, curing the concrete, dismantling the formwork and taking out the concrete block. It has been done.

[0003]

Therefore, in the case of the conventional artificial reef, assembling and dismantling the formwork are troublesome, and there is a limit in reducing the cost. In addition, due to the fact that concrete formwork is assembled using formwork panels, a spherical artificial reef cannot be manufactured, and only a three-dimensional artificial reef such as a cube or a rectangular parallelepiped can be manufactured. . The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide an artificial fish reef that can obtain a spherical three-dimensional shape at low cost.

[0004]

In order to achieve the above object, the present invention provides an artificial reef installed on the seabed or riverbed,
A concrete bottom slab formed in the shape of a ring plate, a concrete wall protruding upward from the concrete bottom slab in a hemispherical shape, and a plurality of openings formed in the concrete wall with a size allowing fish to enter and exit. The concrete wall is provided on the concrete bottom slab with an edge of the entire periphery of the film body which becomes a hemispherical surface in an inflated state, and air is press-fitted into a space inside the film body to be lifted upward by the film body. A convex hemispherical surface is formed, and concrete is sprayed on the outer surface of the membrane while keeping the space in a high pressure state. Further, according to the present invention, the cable extending along the hemispherical surface in a state of being stretched in a direction away from the concrete bottom slab before the air is injected into the space inside the membrane body has an end thereof attached to the concrete bottom slab. After a plurality of fixed and provided at intervals from each other, air is press-fitted into the space inside the film body to form an upwardly convex hemisphere by the film body, and a cable is provided between each of the cables and the film body. The cable is separated from the film body by a plurality of spacers interposed at intervals in the extending direction of the film, and concrete is sprayed on the outer surface of the film body in this state. In addition, according to the present invention, after the cable and the membrane are separated by the plurality of spacers, a reinforcing net is assembled along the cable so as to cover the membrane outside the plurality of cables. Concrete is sprayed on the outer surface of the membrane from the outside.

[0005] In the present invention, since the concrete wall is formed by spraying the concrete on the expanded membrane, it is possible to manufacture an artificial reef at low cost, and the membrane is used. A hemispherical concrete wall is easily obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1A is a plan view of an artificial reef,
(B) shows the front view. The artificial reef 2 has a concrete bottom plate 4 formed in a ring plate shape and a concrete wall 6 formed in a hemispherical shape protruding upward from the concrete bottom plate 4.
And a plurality of openings 8 formed in the concrete wall 6. As shown in FIGS. 4 (A) to 4 (C), the entire peripheral edge of the film body 10 which becomes a hemispherical shape in an inflated state is attached to the concrete wall 6 as shown in FIGS. Air is press-fitted into the space 12 inside the body 10 to form an upwardly convex hemispherical shape by the film body 10, and the film body 1 is kept in a high pressure state in the space 12.
0 is formed by spraying concrete on the outer surface.

More specifically, the concrete wall 6 is manufactured as follows. First, as shown in FIGS. 2A and 2B, a ring-shaped concrete bottom slab 4 is placed on a floor 14.
Is placed, and the film body 10 is placed on the concrete bottom slab 4, and the entire periphery of the film body 10 is airtightly attached to the concrete bottom slab 4 in a circular manner. The film body 10 is shown in FIG.
As shown in the figure, the inflated state is formed into a hemispherical shape. Further, a semi-spherical cable 16 is provided outside the membrane 10 in a state of being stretched away from the concrete bottom slab 4. As the cable 16, a PC steel wire, a wire, or the like can be used. As shown in FIGS. 3A and 3B, the cable 16 is a first cable 16 that extends annularly around the top of the membrane 10 that has been expanded in a hemispherical shape.
01 and the first cable 1601 are provided at locations spaced apart in the circumferential direction of the first cable 1601,
And a second cable 1602 whose lower end is connected to the concrete bottom slab 4.

Next, air is injected into the space 12 inside the concrete bottom slab 4 and the film body 10 on the floor 14. As a result, as shown in FIGS. 3A and 3B, the film body 10 expands into a hemispherical shape while the shape is regulated by the cable 16, and a hemispherical airtight space 12 is formed inside the film body 10. Is formed, and the space 12 is maintained at a high pressure until the concrete wall 6 is completed. Next, as shown in FIG. 4A, a plurality of spacers 18 are interposed between the cable 16 and the film body 10 at intervals in the extending direction of the cable 16 so that the cable 16 and the film body 10 are separated from each other. Release. As a result, the spacers 18 come into contact with the film body 10 this time,
Restricts the three-dimensional shape. As shown in a perspective view of FIG. 6A, the spacer 18 includes a pedestal portion 1801 having a predetermined area to be mounted on the film body 10, and a pedestal portion 1801.
Vertical wall 1802 standing from the center of the
2 is an enlarged front view of a state in which a spacer 18 is interposed between the cable 16 and the film body 10 and is made of a synthetic resin or the like having a bifurcated locking portion 1803 formed on the upper portion of the cable 2 and locking the cable 16. Is shown in FIG. Incidentally, the structure of the spacer 18 is optional, for example, as shown in a perspective view in FIG.
Pedestal 181 having a predetermined area to be placed on film body 10
1, a support 1812 extending from the pedestal 1811,
It is also possible to comprise a forked locking portion 1813 formed on the upper portion of the support portion 1812 and locking the cable 16.

Next, FIG. 8A is a side view, and FIG.
(A), as shown in the view of the arrow B in FIG.
Attach 0. The mold member 20 is, for example, the cable 1
6, wires, metal fittings, and the like, are fixed on the film body 10, and the height of the formwork member 20 is set to the height of the concrete wall 6 so that the concrete does not adhere to the location as shown in FIG. It is formed with a dimension larger than the thickness. The hanging hook 22 shown in FIG. 1B is also fixed to a portion above the film body 10 using the cable 16, wire, metal fitting, or the like. Next, as shown in FIG. 4 (B), a reinforcing net 24 is attached from above the cable 16 so as to cover the entire outer surface of the membrane 10. In addition, an opening (not shown) is formed at a portion of the reinforcing bar net 24 corresponding to the form member 20, and the form member 20 protrudes outside the reinforcing bar net 24 from this opening.

[0010] Next, in this state, concrete is sprayed sequentially from a low place to a high place on the outer surface of the membrane body 10 from above the reinforcing mesh 24, and as shown in FIG.
Of the concrete layer 26 is formed. The first concrete layer 26 is formed by spraying concrete to such an extent that the reinforcing bar 24 is filled. As a result, the cables 16 and the spacers 18 are buried inside the first concrete layer 26, and the reinforcing mesh 24 is almost buried. Next, after the first concrete layer 26 is hardened and cured, concrete is sprayed on the surface of the first concrete layer 26 sequentially from a low place to a high place, and as shown in FIG. A second concrete layer 28 is formed outside the concrete layer 26. Then, when the second concrete layer 28 is cured and cured, the concrete wall 6 is completed. After the concrete wall 6 is completed, the space 12
The inside of the part is returned to the atmospheric pressure, and the membrane body 10 and the mold member 20 are removed, whereby the hemispherical artificial reef 2 having the plurality of openings 8 shown in FIGS. 1A and 1B is obtained.

The artificial reef 2 of the present embodiment is formed by expanding the membrane body 10 and spraying concrete thereon as described above. It can be manufactured at a lower cost than the fish reef 2. Further, since the film body 10 is used, the hemispherical concrete wall 6 can be easily obtained. In addition, since the cable 16 that extends along a desired shape and regulates the film body 10 is provided outside the film body 10, when the space 12 is in a high pressure state, the cable 16 The body 10 is easily formed into a desired hemisphere. In addition, since the cable 16, the spacer 18, and the reinforcing net 24 are buried in the concrete wall 6 without forming a gap or the like inside and serve as a reinforcing material for the concrete wall 6, the strength and durability of the concrete wall 6 and the artificial reef 2 are reduced. It is also advantageous in increasing. Also,
Since the concrete wall 6 is formed by the first and second two concrete layers 26 and 28, a hemispherical concrete wall 6 having a desired thickness can be easily obtained.

In the embodiment, the case where the membrane body 10 is removed has been described. However, the membrane body 10 may be left as it is inside the artificial reef 2. In this case,
After the concrete wall 6 is formed, holes may be formed at 10 places of the film body inside the form member 20. In addition, it is optional, for example, to arrange a reinforcing bar or a reinforcing net on the second concrete layer 28. Further, when the shape is large, it is also optional to provide a third concrete layer outside the second concrete layer 28. It is.

[0013]

As is clear from the above description, the present invention
An artificial reef installed on the seabed or riverbed, a concrete bottom plate formed in a ring plate shape, a concrete wall protruding upward from the concrete bottom plate into a hemisphere, and a fish on the concrete wall. The concrete wall comprises a plurality of openings formed in a size that allows access, and the concrete wall is mounted on the concrete bottom slab, and the entire peripheral edge of the film body that becomes a hemispherical surface in an inflated state is attached. A configuration in which air is press-fitted into the inner space to form an upwardly convex hemispherical surface by the membrane, and concrete is sprayed on the outer surface of the membrane while the interior of the space is maintained at a high pressure. did. Therefore, according to the present invention,
A hemispherical artificial reef can be obtained at low cost.

[Brief description of the drawings]

1A is a plan view of an artificial reef, and FIG. 1B is a front view thereof.

FIG. 2A is a plan view showing a state in which a film body and a cable are arranged on a concrete bottom slab, and FIG. 2B is a front view of the same.

FIG. 3A is a plan view of a state in which air is press-fitted into a space,
(B) is the same front view.

4A is a front view of a state in which a spacer is interposed between a membrane and a cable, FIG. 4B is a front view of a state in which a reinforcing net is put on the outside of the cable, and FIG. FIG. 3 is a front view of a state where a concrete wall is formed on the outside of the vehicle.

FIG. 5 is an enlarged sectional view of a concrete wall.

FIGS. 6A and 6B are perspective views of a spacer.

FIG. 7 is an enlarged front view of a state in which a spacer is interposed between the film body and the cable.

FIG. 8A is a front view of a state in which a mold member is fixed on a film body, and FIG. 8B is a view of FIG.

[Explanation of symbols]

 2 Artificial fish reef 4 Concrete bottom plate 6 Concrete wall 8 Opening 10 Membrane 16 Cable 18 Spacer 20 Form member 24 Reinforcing net 26 First concrete layer 28 Second concrete layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinori Shigeoka 8-2-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside IC Dome Japan Co., Ltd. (72) Inventor Kenjiro Nakano 2 Miyake, Shikima-ku, Himeji-shi, Hyogo No. 59, Iejima Construction Co., Ltd.

Claims (3)

[Claims] 1. An artificial fish reef installed on the seabed or riverbed, comprising: a concrete bottom slab formed in an annular plate shape; a concrete wall projecting upward from the concrete bottom slab to a hemispherical surface; The wall comprises a plurality of openings formed in a size that allows fish to enter and exit, the concrete wall is on the concrete bottom slab,
An edge around the entire periphery of the film body that becomes a hemispherical surface in an inflated state is attached, air is press-fitted into a space inside the film body, and a hemispherical surface that is upwardly convex is formed by the film body. An artificial fish reef, formed by spraying concrete on the outer surface of the membrane while keeping the state. 2. A cable extending along the hemispherical surface in a state of being stretched in a direction away from the concrete bottom slab before pressurizing air into a space inside the membrane body, and fixing an end of the cable to the concrete bottom slab. After the air is press-fitted into the space inside the film body to form an upwardly convex hemisphere by the film body, a plurality of cables are provided between the cables and the film body. The artificial reef according to claim 1, wherein the cable and the membrane are separated from each other with a plurality of spacers interposed at intervals in the extending direction, and concrete is sprayed on an outer surface of the membrane in this state. 3. A cable and a membrane are separated from each other by the plurality of spacers, and then a reinforcing net is attached to the outside of the plurality of cables along the cable so as to cover the membrane. The artificial fish reef according to claim 2, wherein concrete is sprayed on an outer surface of the membrane body.