JPH06146231A - Three-dimensional net-like structure laid underwater - Google Patents

Abstract

PURPOSE:To provide a three-dimensional net-like structure which can prevent a reinforcement and a net-like member from being separated from each other even though affected by ocean current so as to be suitably used for controlling sand drift excellent in the distribution of ocean current and in the configuration retentiveness and for artificial fish living reef. CONSTITUTION:A coarse mesh net member 3 having a high strength is entangled with synthetic thermoplastic polymer continuous wire 2A so as to form several irregular loops. The continuous wire 2A bulges out from the space in each mesh of the coarse mesh net member 3, and is in part wound around a rib part 3A of the net member 3. The cross-point of the entangled wire 2A are bonded, and at least some of parts of the wire 2A crossing the net member 3 are bonded or press-fitted (4) to the latter. Further, a three-dimensional net structure formed by the wire is integrally incorporated with the net member 3 so that they cannot be separated from each other, thereby it is possible to provide a three-dimensional bulky net-like structure having a high strength.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a bulky three-dimensional network structure for undersea facilities, and more particularly to a bulky three-dimensional network portion comprising a large number of thermoplastic synthetic polymer filaments and a high-strength coarse net material. The present invention relates to a three-dimensional net structure that is inseparably integrated and is suitable as a sand drift control material and an artificial fish reef material for preventing the sand on the coast from being carried away by waves and tidal currents.

[0002]

2. Description of the Related Art As a bulky three-dimensional network structure composed of a large number of filaments of a thermoplastic synthetic polymer, for example, Japanese Patent Publication No. 63-
No. 53332, and in order to stabilize the morphology of such a three-dimensional net-like structure, a net-like body in which a coarse-mesh net or a coarse net formed by yarns is used in combination is disclosed in Japanese Utility Model Publication No. 63-9613, Japanese Utility Model Publication No. It is described in JP-A-2-37940.

The three-dimensional network structure disclosed in Japanese Patent Publication No. 63-53332 has a bulk diameter of 0.1 to 1.5.
mm synthetic synthetic polymer continuous filaments form irregular loops and are adhered to each other at their intersections, and because they are bulky and have high compression resistance, they are exclusively used for stabilizing soft ground and for drainage. Also, the actual public Sho 63-961
No. 3, Japanese Utility Model Laid-Open No. 2-37940, a net-like body in which a synthetic polymer continuous filament is entangled in a net has a high soil retention property, an extremely large porosity, and an adaptability to an uneven surface. Therefore, it is mainly used for vegetation.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The three-dimensional reticulated structure as described in JP-A-3-53332 has a relatively large compressive strength but a poor tensile strength in the lateral direction, and is used in applications where it is subjected to tension in the length direction and width direction of the reticulated body, for example, It cannot be used for sand control materials or artificial fish reef materials. Further, the net-like body described in Japanese Utility Model Publication No. 63-9613 and Japanese Utility Model Laid-Open No. 2-37940 in which synthetic polymer continuous filaments are entangled improves the tensile strength of the net to some extent. Since the strand is thin and flexible, the entanglement between the continuous line and the net is weak,
When an external force acts in the thickness direction, the net and the net-like substance are separated from each other, and like the above, it is not suitable for undersea facilities such as sediment control materials and artificial fish reef materials.

According to the present invention, despite being bulky and having a large porosity, it is rich in compressive strength and tensile strength, and the coarse net material and the mesh portion formed by continuous lines of the synthetic polymer are intertwined in an inseparable state, The present invention provides a reinforced three-dimensional network structure suitable for undersea facilities such as sand drift control materials and artificial fish reef materials used under severe conditions.

[0006]

According to the present invention, a coarse net material made of a thermoplastic synthetic polymer having a large mesh portion and having excellent tensile strength is entangled with a continuous line of synthetic polymer so as to intersect with the coarse net material. The above problem is solved by forming a structure in which at least a part of the continuous filaments is adhered or pressure-bonded to a coarse net material, and the size of the mesh portion is 8
A coarse net material made of a thermoplastic synthetic polymer having a tensile strength of 500 to 100 cm ² and a tensile strength of 500 kg / m or more has a diameter of 0.
A large number of 1 to 2 mm thermoplastic synthetic polymer continuous filaments are entangled in a mesh shape with irregular loops, and the continuous filaments are bulged in the space of the mesh portion of the coarse net material and each intersection point of the continuous filaments Is bonded, and at least a part of the continuous wire that intersects the coarse net material is bonded or pressure bonded to the coarse net material, and the three-dimensional net portion formed by the continuous wire and the coarse net material are inseparably integrated. It is characterized by being done.

Examples of the thermoplastic synthetic polymer forming the reticulated portion include polymers such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6, nylon 6,6 and the like. Alternatively, a copolymer can be appropriately selected and used, but polyethylene and polypropylene having a relatively low melting point are convenient in view of production cost.

As a coarse net material to be a reinforcing material, the opening area is 8 to 100 cm ² and the aggregate is 1 to 5 m thick.
m, width of 1.5 to 10 mm, synthetic resin molding net or 2
A resin net material having a large tensile strength, such as a net obtained from an axially stretched perforated resin sheet having a thickness of 1 to 5 mm or a net made of a synthetic resin monoilament having a thickness of 2 to 5 mm, is suitable, and particularly, a net portion is preferable. It is preferable that it is of the same type or of the same quality as the thermoplastic synthetic polymer to be formed.

The three-dimensional network structure of the present invention having a desired thickness and voids and entwined with a coarse net material has a diameter of 0.1 to 2.0 by a melt spinning machine using the above polymer or copolymer.
A large number of mm-mm resin filaments are spun in horizontal rows, and a carrier having an uneven surface is provided below the spinning machine, and a coarse net material is stretched on the carrier at a distance from the carrier. While gently moving the carrier and the coarse net material, the spun resin filaments are allowed to fall and accumulate on top of them while not solidifying yet. At the time of accumulation, each filament is bent irregularly and the intersections are self-bonded. Then, the spun resin filaments can be efficiently obtained by pressing the spun resin filaments toward the coarse net side with a nip roller.

The unit weight of the mesh portion is preferably about 1000 to 2500 g / m ² in consideration of durability and the desired porosity, and the apparent thickness is preferably about 10 to 50 mm. The net-like portion thus formed has a porosity of 70 to 95.
%, The transmittance of parallel rays in the thickness direction is 20 to 70%, and it has an appropriate tidal current passage property in the sea, which is convenient for the application of sand control materials and artificial fish reef materials.

When the porosity is less than 70%, the transmittance of parallel light rays in the thickness direction becomes 20% or less, and when applied to sand drift control materials and artificial fish reef materials, the load due to tidal current increases and It causes damage to the artificial reef and has a porosity of 9
Greater than 5% results in too good passage of tidal currents, impairing the desired function, for example the function of preventing coastal sand runoff.

When the above three-dimensional net structure of the present invention is used for undersea facilities, for example, as a sand control material, a groove is provided on the upper surface of a concrete block molded in a frame shape, and the lower end portion of the three-dimensional net structure is formed in the groove. About 30 ~ height embedded
It is good to set them up in a fence shape at 100 cm and install them in parallel in the sea.

When it is used as an artificial fish reef material, the above three-dimensional net-like structure is formed into an arbitrary shape to form a floating fish reef using weights and buoys. It is better to sink and reef.

When applied as a marine facility in this way,
It is expected that the free end of the net-like material will spread like a trumpet due to the stones and shellfish in use. To prevent this,
It is also a preferred embodiment that the free end portion is adhesively flattened and strengthened.

[0015]

[Function] A three-dimensional mat-like mesh portion having a high porosity formed by continuous filaments of a thermoplastic synthetic polymer of a three-dimensional network structure relaxes the tidal current velocity in marine materials such as sand control materials. While allowing the tidal current to pass smoothly, it prevents the beach sand from being carried off along with the tidal current. The coarse net reinforces the net-like portion and maintains the fence-like shape erected on the concrete block to prevent it from swaying like seaweed and prevent destruction by ocean currents.

When artificial fish reefs, such as concrete blocks, are erected and sunk along the coastline in the sea near the coastline to be laid as fish reefs, the three-dimensional net-like structure maintains a fence-like state and has an appropriate elasticity. Although it does not sway like seaweed, it exerts a shading effect and a saving effect for small fish and allows the tidal current to pass smoothly, and seaweed and shellfish adhere to the lines of the three-dimensional reticulated structure for an excellent fish collecting action. Play.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings showing the embodiments of the present invention, FIG. 1 is a partial perspective view of a three-dimensional network structure, and FIG. 2 is a sectional view in the thickness direction of FIG. Three-dimensional net-like structure, (2) is a three-dimensional net, and (3) is a coarse net.

In the present embodiment, the coarse net (3) has
The width of the aggregate part (3A) obtained by extruding polypropylene resin and biaxially stretching it is 2 mm, the thickness is 1.2 mm, the first size is about 9.9 cm ² , and the tensile strength is about 2500.
A biaxially stretched net of kg / m is applied. The three-dimensional reticulated part (2) has a diameter of 1. extruded from the melt spinning machine.
Coarse net (3) made of 2 mm polypropylene continuous filament (2A) (2A) and made of this polyethylene
In addition, a large number of the above polypropylene resin continuous filaments (2A) (2A) are entangled in a mesh with an irregular loop to form a coarse net material.
In the space of the mesh part of (3), the continuous filaments (2A) (2A) are bulged and the intersections of the continuous filaments (2A) (2A) are bonded together, and further a part of the continuous filament (2A) is A continuous line (2) that runs around the aggregate part (3A) of the coarse net material (3) and intersects with the coarse net material (3).
At least a part of (A) is adhered or pressure-bonded (4) to the coarse net material (3) to integrate the solid mesh portion (2) and the coarse net material (3) into a bulky solid mesh having a large porosity. Structure
(1)

In the three-dimensional network structure (1) of the embodiment, the continuous line (2A) has a basis weight of about 1600 g / m ² and an apparent thickness of about 30 mm, forming an irregular mesh as a whole, and the voids thereof. The ratio is 92%, and the transmittance of parallel rays in the thickness direction is about 50%.

The above-mentioned three-dimensional network structure (1) can be manufactured as follows. That is, as schematically shown in FIG. 3, a large number of continuous polypropylene resin filaments (2A) having a diameter of 1.2 mm are spun out in a row from the melt spinning machine (10), and the spinning is carried out below the spinning machine (10). 4 is provided with a carrier body (13) having a mountain portion (11) and a groove portion (12) on the surface as shown in FIG. 4, and is spaced apart from the carrier body (10) on the carrier body (10). The coarse net material (3) is stretched, and the carrier (10) and the coarse net material (3) are moved together in the direction of the arrow at a speed slower than the falling speed of the spun and melted continuous filament (2A). Spinned resin continuous filaments (2
(A) is not solidified yet, it is naturally dropped and accumulated, and during the accumulation, each continuous filament (2A) is bent irregularly and the spun resin continuous filament (2A) is formed between the coarse net material (3). ) Is swelled and self-bonded at the intersection, while the nip roller (14) is used to spun the coarse net material (3) onto the resin continuous filament (2
It can be efficiently obtained by pressing to the A) side.

The transmittance (porosity) of parallel light rays in the thickness direction of the three-dimensional net-like structure (1) depends on the speed of the carrier (13) and the continuous filament.
It can be adjusted by changing the basis weight of (2) or the thickness of continuous line (2). The three-dimensional reticulated structure (1) as a drift sand control material and artificial fish reef material has a synthetic resin continuous filament (A) with a thickness of 0.1 to 2.0 mm and a basis weight of 1000.
~ 2500 g / m ² , parallel light transmittance of 20-70
%, 3D net-like part with an apparent thickness of 10 to 50 mm
(2) is desirable. If the thickness of the continuous line (2) is less than 0.1 mm, it is likely to be deformed by the tidal current, and 2.0 mm
If it is thicker than this, not only is it uneconomical, but it also becomes difficult to form a three-dimensional network body having a uniform porosity. If the basis weight is too large, the tidal current resistance will increase, and if it is too small, the sand drift prevention function, the seaweed adhesion growth base and the seaweed growth function will be deteriorated.

When the three-dimensional reticulated structure (1) of the present invention is used as a sand control material, as shown in FIG. 5, a frame-shaped concrete block having a space (20) and a groove (21) on the upper surface ( twenty two)
Was formed into a weight, and the lower end of the sand control material (1) was fitted into the groove (21) and poured concrete,
Good to stand and fix.

The concrete block (22) on which the three-dimensional net-like structure (1) of the present invention is erected may be a triangle or a quadrangle, but as shown in the figure, it is between the frame-shaped outer peripheral block portions (22A). It is preferable to provide a cross block portion (22B) extending diagonally or diagonally to the cross block portion (22B) .The cross block portion (22B) is also provided with a groove (21). The net-like structure (1) is erected and fixed, and the three-dimensional net-like structure (1) standing on the outer peripheral block (22A) and the three-dimensional net-like structure (1) standing on the cross block (22B) are respectively placed. These three-dimensional network structures (1) (1) if they are not bound to each other
Can reinforce each other and increase endurance against tidal currents. And the space inside the outer peripheral block (22A)
(20) serves to protect the ecosystem on the seabed, as described in JP-A-3-172408.

As described above, the three-dimensional net-like structure (1) is erected and fixed on the concrete block (22), and a large number of these are laid down in line along the shoreline direction from the breaking wave zone near the shoreline to the shoreline. In the section up to, the coastal sand is prevented from being carried offshore by waves and tidal currents, and the sand drift control function is exerted to maintain the landscape of the sandy beach.

FIG. 6 shows that a box-shaped structure (25) having a hollow portion whose central portion on the side surface is open is molded with concrete to form a weight, and several pieces are formed on the bottom surface (26) in this hollow portion. Groove
(21) is provided and the lower end of the three-dimensional net-like structure (1) is fitted into the groove (21) in the same manner as in the above-mentioned example, and the three-dimensional net-like structure (1) is erected in parallel and erected. It shows an example of a type artificial reef.

When a large number of the artificial reefs shown in FIG. 6 were laid side by side on the seabed at a depth of 5 m, seaweeds and shellfish spores began to adhere after one month, and after three months, the seaweeds and shellfish splendidly lived. Has grown to In addition, shrimps, larvae, crabs, and other small organisms flocked around the artificial fish reef (24) to which seaweed and shellfish adhered in this way, and no clogging of the artificial fish reef material (1) was observed.

Although the artificial fish reef material is exemplified by a sinking fish reef in the embodiments, it is also possible to assemble a three-dimensional net-like structure into, for example, a shelf shape and use it as a floating fish reef by using a weight and a buoy. .

[0028]

As described above, in the three-dimensional net-like structure (1) for undersea facilities of the present invention, the size of the mesh portion is 8 to 100 cm.
^{2. A} coarse net material (3) made of a thermoplastic synthetic polymer having a tensile strength of 500 kg / m or more and a diameter of 0.1 to 2 m.
Many of the thermoplastic synthetic polymer continuous filaments (2A) of m are entangled in a mesh with irregular loops, and the continuous filaments (2A) are swelled in the space of the mesh portion of the coarse net material (3). The intersections of the continuous filaments (2A) are bonded together, and a part of the continuous filaments (2A) wraps around the aggregate part (3A) of the coarse net material (3),
At least a part of the continuous wire (2A) intersecting with (3) is adhered or pressure-bonded (4) to the coarse net material (3) to form the solid net-like portion (2) formed by the continuous wire (2A). ) And coarse net material
(3) and (3) are inseparably integrated, and the bulky three-dimensional network portion with a large porosity is reinforced by the integration of a coarse net (3) that is tough and has excellent corrosion resistance.
It has moderate resistance against tidal currents and exerts a decelerating effect on tidal currents in the sand drift area of the sea floor, which can prevent the drift sand generated at the coast from being carried offshore by waves and tidal currents and can be three-dimensionally reticulated. The part (2) and the coarse net (3) are not separated, and the sand control function is maintained for a long time.

Similarly, when applied to artificial fish reef materials,
The bulky, high-porosity three-dimensional net is reinforced by the integration of a tough and highly corrosion-resistant coarse net (3), which is tough and durable, and the mat-like net has a water permeability coefficient of 3 cm. / Sec or more, seawater smoothly circulates in the thickness direction of this three-dimensional reticulated structure (1), so that the seawater between the three-dimensional reticulated structures (1) (1) does not stagnant. It is a perfect shelter for larvae. In addition, three-dimensional network structure
Since (1) is a mat-like network of continuous filaments of thermoplastic synthetic polymer, it can be processed into various shapes depending on the installation location,
The height and width can be changed, making it easier to manufacture artificial fish reefs.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional net-like structure.

FIG. 2 is a sectional view in the thickness direction of FIG.

FIG. 3 is a side view schematically showing a manufacturing process of a three-dimensional network structure.

FIG. 4 is a plan view of the carrier shown in FIG.

FIG. 5 is a partially cutaway perspective view showing an example in which a three-dimensional net-like structure is applied to a sand transport control material.

FIG. 6 is a perspective view showing an example in which a three-dimensional net-like structure is applied to an artificial fish reef material.

[Explanation of symbols]

 1 three-dimensional reticulated structure 2 three-dimensional reticulated part 2A. Synthetic resin continuous wire 3. Coarse net 3A. Aggregate part of coarse net 4. Glued or crimped part

Claims (2)

[Claims] 1. The size of the mesh portion is 8 to 100 cm ² ,
A large number of continuous thermoplastic synthetic polymer filaments having a diameter of 0.1 to 2 mm are entangled in a mesh shape in a coarse net material made of a thermoplastic synthetic polymer having a tensile strength of 500 kg / m or more. ， The continuous filaments are bulged in the space of the mesh portion of the coarse net material, the intersections of the continuous filaments are adhered, and a part of the continuous filaments goes around the aggregate portion of the coarse net material.
At least a part of the continuous wire that intersects the coarse net material is bonded or pressure bonded to the coarse net material, and the three-dimensional net-like portion formed by the continuous wire and the coarse net material are inseparably integrated. A three-dimensional net-like structure for undersea facilities. 2. The basis weight of the continuous line of the three-dimensional net-like portion is 10
It is 0 to 2500 g / m ² , and the apparent thickness is 10 to 10.
The three-dimensional net-like structure for an undersea facility according to claim 1, having a 50 mm and a porosity of 70 to 95%.