JP4100109B2 - Sand surface stabilization structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand surface stabilization structure for stabilizing a sand surface, and more particularly to a sand surface stabilization structure for preventing the movement of sand on the sea bottom to stabilize the sand surface.
[0002]
[Prior art]
For the purpose of preventing scouring of the bottom of the sea and improving the biological environment of the bottom of the sea against various low-lying organisms such as sea lions, algae such as sea bream and shellfish that make up the gallamo field, Various methods have been proposed for preventing the outflow of water and stabilizing the sea bottom. For example, there has conventionally been a sand surface stabilization structure that covers a sand surface with a sheet member containing a weight inside a semi-permeable structure having a loofah structure in which a large number of filaments are intertwined (see, for example, Patent Document 1). ). The sheet member used for the stabilization structure of the sand surface is a semi-permeable member that covers the seabed to make it possible to propagate seed plants such as sea cucumber, and does not move due to the flow of waves and tides. In this way, the weight is included.
[0003]
[Patent Document 1]
JP-A-9-235713 [0004]
[Problems to be solved by the invention]
By the way, the weight contained in the semi-permeable structure has a considerable weight in order to suppress movement due to the flow of waves and tides. On the other hand, since the semi-permeable structure is formed by entwining the filament, the strength is relatively low. For this reason, when a force that rises up due to the flow of waves or tides acts on the sheet member laid on the seabed, while the contained weight acts to suppress the force, the semi-permeable structure There was a risk of damage due to large forces.
[0005]
Moreover, in order to cover the sea bottom over a wide range, the sheet member requires a considerable area. For this reason, in the laying of the sheet member, there is a problem that a wide sheet member must be transported to the laying site and laid on the seabed over a wide range, and much labor and time must be spent. .
[0006]
Therefore, the present invention has been made in view of such a conventional problem, and can easily perform a work of laying a member for stabilizing the sand surface in a wide area of the seabed, and can also be used for waves and tides. The object of the present invention is to provide a sand surface stabilization structure in which the semipermeable structure is not easily damaged by the flow of water.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the sand surface stabilizing structure according to claim 1 of the present invention is formed in a mat shape by irregularly intertwining a large number of filaments, and a void communicating with the outside is formed inside thereof. A semi-permeable mat-like structure and a weight body for suppressing the movement of the mat-like structure, and the sand surface stability for stabilizing the sand surface by covering the sand surface of the seabed In the structured structure, the weight body is configured by arranging a plurality of steel wires in a lattice shape, and the weight bodies are provided on the front and back surfaces of the mat-like structure, respectively. The weight bodies adjacent to each other on the side are connected to each other so that their outermost parallel steel wires are connected to each other by a bundle member so as to be rotatable .
[0008]
According to such a sand surface stabilization structure, a semi-permeable mat-like structure having a gap communicating with the outside is moved by a wave, a flow, or the like by a weight body provided on the outside. Thus, it is possible to maintain and maintain the predetermined position. In particular, since a weight body is provided on the outside of each mat-like structure, the entire interior of the mat-like structure can be made a good growth area such as algae and crustaceans when laid on the seabed. . Furthermore, since the weight body is provided outside the mat-like structure, the force acting on the mat-like structure from the outside also acts on the weight body, and the force acting directly on the mat-like structure is not affected. As a result, the mat-like structure can be prevented from being damaged. Here, the mat-like structure is made of various materials such as a synthetic resin-based material such as a thermoplastic synthetic polymer or a metal material such as an iron wire or a copper wire. Shown intertwined.
[0009]
The sand surface stabilization structure includes a plurality of mat-like structures provided with the weight body so as to cover the entire front and back surfaces of the mat-like structure, and the mat-like structure includes the mat- like structures. by steel wire between the outermost periphery of the weight body is connected by bundled wire member, it is also possible, which is foldably connected to one another.
According to such a sand surface stabilization structure, it is possible to lay a mat-like structure over a wide area of the seabed. In addition, since the plurality of mat-like structures are connected to each other, there is no need to individually fix the mat-like structures to the seabed or to connect them on the seabed, and lay them easily even over a wide area of the seabed. It is possible to realize a sand surface stabilization structure that can be used.
[0010]
Furthermore, in the sand surface stabilization structure, it is desirable that the mat-like structures that are connected and adjacent to each other can be folded at the connecting portion.
According to such a sand surface stabilization structure, adjacent mat-like structures are folded at the connecting portion, so that each mat-like structure can be folded while maintaining a state in which a weight body is provided. Is possible. Therefore, it is possible to cover a wide range of sand surfaces simply by unfolding the folded sand surface stabilization structure. Therefore, for example, the folded sand surface stabilization structure is transported to the sea located above the seabed to be laid by using a transport ship or the like, and one mat-like structure is pulled down from the shipboard to connect them. The mat-like structure can be taken down sequentially. For this reason, it is possible to lay on the seabed easily and efficiently, and it is possible to realize a sand surface stabilization structure that can be easily laid on a wide range of seabeds. At this time, since the sand surface stabilizing structure is folded at the connecting portion, the mat-like structure is not bent, and therefore can be folded without applying a load to the mat-like structure.
[0011]
In such sand surface stabilizing structure, prior Symbol plurality of mat-like structures are arranged in rows, one end of each mat-like structure weight of the surface side and the other end back side It is desirable that the weight bodies are connected to the weight bodies on the same surface side of the adjacent mat-like structures.
[0012]
According to such a sand surface stabilizing structure, the adjacent mat-like structures arranged in a row are connected by the weight body, and therefore there is no possibility of damaging the mat-like structure even when folded. . Moreover, it is connected on the same surface side of adjacent mat-like structures, and each mat-like structure has one end connected on the front side and the other end connected on the back side. Therefore, the adjacent mat-like structures can be folded with their front surfaces or back surfaces facing each other, and can be stacked in an orderly manner. For this reason, it is possible to orderly superimpose regardless of the thickness of the mat-like structure. Therefore, the area occupied by the sand surface stabilization structure in the folded state can be further reduced. Therefore, it is possible to carry more mat-like structures in a state where the sand surface stabilization structure is folded, so that it is possible to efficiently lay it over a wide area of the seabed, and it is easy to carry and work. A sand surface stabilization structure can be realized.
[0013]
In the sand surface stabilization structure, the front and back surfaces of the mat-like structure are provided with a plurality of the weight bodies divided at the same position on the front and back sides. These weight bodies may be connected to each other such that their outermost peripheral parallel steel wires are connected to each other by a bundled wire member .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sand surface stabilization structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory view showing the structure of a first embodiment of a sand surface stabilization structure according to the present invention, FIG. 2 is a view taken along the arrow A in FIG. 1, and FIG. 3 is a state where unit sand surface stabilization structures are connected. FIG.
[0015]
The sand surface stabilization structure 10 of the present embodiment prevents sand movement due to tide flow, waves, etc., and covers the sand surface of the seabed in order to maintain a suitable biological environment for various low-lying organisms. Is to be laid.
[0016]
This sand surface stabilization structure 10 is formed in a mat shape, and has a semi-permeable mat 20 as a mat-like structure having a semi-permeable structure provided with a space communicating with the outside. The unit sand surface stabilization structures 12 having a grid-like weight 22 as a weight body provided in order to suppress the movement of the grid 20 are connected in a row.
[0017]
The semi-permeable mat 20 is a rectangular mat member having a thickness of about 10 to 50 mm, preferably about 25 mm and having a planar shape of about 1 m ² , and is made of a thermoplastic polymer and has a thickness of about 1.0 mm. A large number of continuous filaments (hereinafter referred to as “continuous filaments”) are entangled in a large number of irregular loops, and have a structure such as loofah.
[0018]
In addition, the inside of the semi-transmissive mat 20 has a large number of loops of the filament itself so that the porosity is about 80 to 90% and the parallel light transmittance in the thickness direction is about 3% to 40%. Due to the rigidity, they are intertwined in a state of a loofah shape as a whole. As a result, as described later, when the semi-permeable mat 20 is laid on the sea bottom, a reflection area is formed on the front surface of the sand surface stabilization structure 10 with respect to waves and tides moving in the vicinity of the sea bottom. Or without causing a countercurrent area behind, it is possible to dissipate the energy of waves and tides flowing through the sand surface stabilization structure 10 by generating vortex damping. Therefore, it is comprised so that the movement of the sand of a sea bottom can be prevented and the stable sand ground can be hold | maintained on the sea bottom where this was installed.
[0019]
Furthermore, on the surface of the semi-permeable mat 20, for example, a corrugated pattern or a concavo-convex pattern in which a large number of independent protrusions and protruding pieces protrude is formed. That is, such a concavo-convex shape can be easily provided by forming using a production form having a similar concavo-convex pattern. For example, the depth of the concave groove, that is, the valley portion is about 20 to 30 mm, and the width Is preferably about 10 mm, and the grooves are preferably formed so as to be continuous over a wide range.
[0020]
The lattice weight 22 is formed by arranging a plurality of steel wires 22a having a diameter of about 10 mm in a lattice shape and welding at intersecting positions. In the example of FIG. 1, eleven steel wires 22a are arranged in parallel at intervals of 100 mm with respect to a rectangular semi-permeable mat 20 having a side of 1 m, and further 11 steel wires 22a are arranged at intervals of 100 mm. The upper and lower steel wires 22a are welded to each other so as to be orthogonal to the lower steel wire 22a.
[0021]
One lattice weight 22 is provided on each of the front and back surfaces of the semi-permeable mat 20, and the two lattice weights 22 and the semi-permeable mat 20 pass through the semi-permeable mat 20 on the front and back surfaces. It is fixed at a plurality of locations by a bundle member (not shown) such as a wire for connecting the lattice weights 22 to each other. At this time, in the two lattice weights 22, the steel wires 22 a arranged in a lattice shape and arranged on the outermost side are respectively arranged along the outer peripheral edge 20 a on the front and back sides of the semipermeable mat 20. become.
[0022]
Thus, the plurality of unit sand surface stabilization structures 12 in which the two lattice weights 22 and the semi-permeable mat 20 are integrally formed are connected in a row as shown in FIG. A stabilizing structure 10 is formed. The adjacent unit sand surface stabilization structures 12 are arranged so that the steel wires 22a provided along the outer peripheral edge 20a on the same surface side are parallel to each other, and the parallel steel wires 22a are connected to each other. These are connected at one or a plurality of locations by a bundle member 24 such as a wire formed in an annular shape. At this time, each unit sand surface stabilization structure 12 excluding the unit sand surface stabilization structures 12 located at both ends of the plurality of unit sand surface stabilization structures 12 arranged in a row is adjacent to the unit sand. Two connecting portions 26 with the surface stabilizing structure 12 are provided. Of these two connecting portions 26, one connecting portion 26 is provided on the front surface side and the other connecting portion 26 is provided on the back surface side, and the adjacent unit sand surface stabilization structures 12 are connected to each other on the connecting surface side. It has a degree of freedom that allows it to rotate. That is, the sand surface stabilization structure 10 has a configuration in which the adjacent unit sand surface stabilization structures 12 can be folded at the connection part 26 to the surface side where the connection part 26 is provided. The unit sand surface stabilization structures 12 can be stacked while being connected by folding at all the connecting portions 26. In addition, since the unit sand surface stabilization structures 12 are connected to each other by the bundle members 24, the steel wire 22 a is folded at the connection part 26 or part of the unit sand surface stabilization structures 12. Even if an external force acts on the semi-permeable mat 20, an external force such as a tensile force does not act directly. For this reason, it becomes possible to suppress damage to the semi-permeable mat 20 due to external force.
[0023]
In the present embodiment, an example in which the sand surface stabilization structure 10 is configured by connecting a plurality of unit sand surface stabilization structures 12 has been described. However, a single unit sand surface stabilization structure 12 is a sand surface stabilization unit. The structure 10 may be used. Also, as shown in FIG. 4, if the grid weights 22 provided on the front and back surfaces of the semi-permeable mat 20 are divided and connected by a bundle member 24 so as to be rotatable, it is easy to become familiar with the sea bottom. The sand surface stabilization structure 10 can be configured.
[0024]
And the sand surface stabilization structure 10 of this 1st Embodiment expand | deploys the said unit sand surface stabilization structure 12, and is laid in planar shape covering the sea bottom of a predetermined area | region. That is, the sand surface stabilization structure 10 is transported to a predetermined sea, for example, in a state of being folded on a work ship or the like, and is laid and installed on the sea bottom from the work ship using a crane or other suspension tool. At this time, since the unit sand surface stabilization structures 12 are connected to each other, it is not necessary to individually suspend them in the sea, and a plurality of unit sand surface stabilization structures 12 suspended on the sea floor are in the sea. There is no need to connect them. In particular, since a plurality of unit sand surface stabilization structures 12 are connected to each other, they can be easily laid on a wide area of the seabed, and can be used more stably on the seabed.
[0025]
And the sand surface stabilization structure 10 developed on the sea bottom is driven by a spike member formed by bending a reinforcing bar into a U shape and fixed to the sand surface. At this time, the spike material is arranged straddling the lattice weight 22 so that the semi-permeable mat 20 is not damaged by the spike material when an external force is applied to the sand surface stabilization structure 10 by the flow of waves or tides. It is desirable to do.
[0026]
The semi-permeable mat 20 installed in this manner is light and easy to handle in the air because it retains an appropriate transmittance, and is not easily affected by waves and tides in the sea. It can be easily installed and installed individually using a lifting tool or the like. Furthermore, when installing with respect to the seabed of a large area, the other unit sand surface stabilization structure 12 is connected beforehand also to the horizontal direction of the unit sand surface stabilization structure 12 arrange | positioned in a row | line | column. It is desirable.
[0027]
Furthermore, because it is easy to transport, it can be mass-produced by factory production, and it is lightweight and easy to stack while connected, so it is economical to transport large quantities of products that cover large areas by trucks etc. it can. Furthermore, since the semi-permeable mat 20 is provided between the two lattice weights 22, the semi-permeable mat 20 is protected by the lattice weight 22 and is easy to handle. For this reason, the assembly work on the work base or work ship can be easily performed.
[0028]
That is, the sand surface stabilization structure 10 of the first embodiment can be easily manufactured, and since it is easy to handle, the work efficiency is good and the construction is economical, so it is easily adopted. can do.
[0029]
And, on the sea floor where the sand surface stabilization structure 10 is laid, the tide passes through the semi-permeable mat 20 intertwined with the continuous filaments, so that the momentum is relieved and the sand on the sea bottom is not taken away. Therefore, a stable sand ground is formed and held. This also makes it possible to prevent scouring of the sand surface in areas with strong wave power such as crush zones.
[0030]
In the present embodiment, the bundling member 24 is formed in an annular shape, but has a degree of freedom that allows the two unit sand surface stabilization structures connected to each other to be folded and cannot be easily detached. It is not limited to an annular shape.
[0031]
FIG. 5 is a perspective view showing a sand surface stabilization structure according to the second embodiment of the present invention, and FIG. 6 is a cross-sectional view of a unit sand surface stabilization structure constituting the sand surface stabilization structure.
The sand surface stabilization structure 30 of the second embodiment is configured by using a plurality of unit sand surface stabilization structures 12 of the first embodiment.
The sand surface stabilization structure 30 includes a plurality of unit standing stabilization structures 32 in which the unit sand surface stabilization structure 12 has a C-shaped cross section, for example, and is erected on a steel material 34 as a base. Are connected to each other.
[0032]
The steel material 34 is formed of a square steel material having a substantially rectangular cross section, and a slit 34a is formed at the center of one side surface along the longitudinal direction of the square steel material. The slit 34a is formed to be sufficiently wider than the thickness of the unit sand surface stabilizing structure 12, and the steel material 34 is disposed with the slit 34a facing upward.
[0033]
The unit standing stabilization structure 32 is inserted into the steel material 34 through the slit 34a and fixed to the lower surface of the steel material 34, and the semipermeable property is provided between the inner surface of the steel material 34 and the unit sand surface stabilization structure 12. A semi-transmissive member 36 having the same configuration as the mat 20 is provided.
[0034]
Then, a plurality of unit standing stabilization structures 32 are arranged in vertical and horizontal directions, and square steel members 38 are passed in a lattice shape below the steel members 34 of each unit standing stabilization structures 32, each of which is a square steel member 38. And the unit standing stabilization structure 32 are fixed, and the sand surface stabilization structure 30 is formed.
[0035]
According to the sand surface stabilization structure 30, the loop-shaped gaps of the semi-permeable mat 20 and the semi-permeable member 36 can of course be used as good growth areas such as algae and crustaceans. However, even for relatively large waves and strong tides, the energy can be attenuated sequentially, and a stable sand ground on the sea floor where the sand surface stabilization structure 30 is installed can be maintained. It becomes possible.
[0036]
In this 2nd Embodiment, although the example which provided the semi-permeable member 36 between the inner surface of the steel material 34 and the unit sand surface stabilization structure 12 was shown, the semi-permeable member 36 does not necessarily need to be provided, Further, the square steel material 38 may be filled with concrete. Furthermore, although the base is made of the steel material 34 having a C-shaped cross section, the steel material may have a U-shaped cross section, or two L-shaped steel materials may be used. When using L-shaped steel materials, the flat plate portions of the two L-shaped steel materials are opposed to each other, and the other flat plate portions are arranged facing outward, and the unit sand surface is stabilized between the opposed flat plate portions. It is desirable to sandwich the lower ends of the structures 12 and fix them together.
[0037]
Further, as shown in FIGS. 7 and 8, the sand surface stabilization structure 10 of the first embodiment is laid on the seabed, and the sand surface stabilization structure 30 of the second embodiment is placed and fixed. As a result, it is possible to more effectively hold a stable sand ground on the bottom of the sea, and it is possible to secure a larger favorable growth area such as algae and crustaceans.
[0038]
Further, in the above embodiment, the semi-permeable mat 20 is simply a rectangular mat-shaped member and has a gap inside. However, these shells and the like are used so as not to inhibit the growth of relatively large shells and the like. It is good also as a structure which provided the through-hole which can enter in a semi-permeable mat.
[0039]
【The invention's effect】
As described above in detail, the sand surface stabilization structure according to the present invention has a configuration in which a weight body is provided outside a semi-permeable mat-like structure provided with a gap communicating with the outside. As a result, when an external force acts on the mat-like structure, it acts on the weight body, so that damage to the mat-like structure can be suppressed. Furthermore, the entire interior of the mat-like structure can be a good growth area such as algae and crustaceans. In particular, the mat-like structure has a structure in which filaments are intertwined, so spores such as kelp floating in the sea are likely to adhere. Furthermore, by configuring the weight body provided outside the mat-like structure with steel materials, it is possible to supply iron necessary for growing kelp, etc., and it is possible to form an environment in which kelp is easy to grow. It is.
[0040]
Further, since the plurality of mat-like structures provided with the weight bodies are connected to each other, it is possible to lay them easily even in a wide range of the seabed.
[0041]
Furthermore, since the connected mat-like structures can be folded at the connecting portion, it is possible to cover a wide range of sand surfaces simply by unfolding the folded sand surface stabilizing structure.
[0042]
Further, since the adjacent mat-like structures are connected by the weight body, there is no possibility of damaging the mat-like structures even when folded. Furthermore, since each mat-like structure is connected on the same surface side of adjacent mat-like structures, one end is connected on the front side, and the other end is connected on the back side, Adjacent mat-like structures can be folded with their front or back surfaces facing each other and can be stacked in an orderly manner, and more mat-like structures can be transported in the folded state. Therefore, it is possible to efficiently lay it over a wide area of the seabed, and it is possible to realize a sand surface stabilization structure with good transportability and workability.
[0043]
In addition, since the sand surface stabilization structure has a structure in which the mat-like structure is erected on the base, it can act as a kind of resistor in the sea, even when it receives wave energy, It is possible to more effectively prevent the drifting sand from being carried offshore with the tide.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a sand surface stabilization structure according to a first embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a conceptual diagram showing a state in which unit sand surface stabilization structures are connected.
FIG. 4 is a diagram showing a bent state of a unit sand surface stabilization structure.
FIG. 5 is an explanatory view showing a sand surface stabilization structure according to a second embodiment of the present invention.
6 is a cross-sectional view of FIG.
FIG. 7 is an explanatory view showing a modification of the sand surface stabilization structure according to the second embodiment.
8 is a cross-sectional view of FIG.
[Explanation of symbols]
10 Sand surface stabilization structure 12 Unit Sand surface stabilization structure 20 Semi-permeable mat (mat-like structure)
22 Lattice weight (weight)
22a Steel wire 24 Bundling member 26 Connection part

Claims (5)

In order to suppress the movement of the mat-like structure, a lot of filaments are irregularly entangled and formed into a mat-like shape, and a semi-permeable mat-like structure having a gap communicating with the outside inside In the sand surface stabilization structure for stabilizing the sand surface covering the sand surface of the seabed,
The weight body is configured by arranging a plurality of steel wires in a lattice shape, and the weight body is provided on each of the front and back surfaces of the mat-like structure,
The weight bodies adjacent on the same side of the mat-like structure are connected to each other in such a manner that their outermost peripheral parallel steel wires are connected to each other by a bundle member. Features a sand surface stabilization structure. A plurality of mat-like structures provided with the weight body so as to cover the entire front and back surfaces of the mat-like structure , the mat-like structure being a steel wire at the outermost periphery of the weight body of each mat-like structure The sand surface stabilization structure according to claim 1, wherein the two are connected by a bundle member .   The sand surface stabilization structure according to claim 2, wherein the mat-like structures that are connected and adjacent to each other can be folded at a connection portion. Before SL plurality of mat-like structures are arranged in rows, mat-like one end of the mat-like structure weight of the surface side, the other end by weight of the back surface side, respectively adjacent The sand surface stabilization structure according to claim 2 or 3, wherein the sand surface stabilization structure is connected to a weight body on the same surface side of the structure. Each of the front and back surfaces of the mat-like structure is provided with a plurality of weight bodies divided at the same position on the front and back sides, and in the divided portion, the plurality of weight bodies are parallel to each other on the outermost periphery. The sand surface stabilization structure according to claim 1 , wherein the steel wires are connected to each other by a bundle member so as to be rotatable with respect to each other .

Images