JP6901767B2 - Strut structure - Google Patents

Description

The present invention relates to a strut structure, and more particularly to a strut structure that can be advantageously implemented as a strut for mooring aquaculture nets or the like used for fixed seaweed cultivation utilizing the ebb and flow of the tide.

Traditionally, seaweed cultivation uses the floating type in which the aquaculture net is always floating on the sea surface and the ebb and flow of the tide, so that the aquaculture net is above the sea surface at low tide and is buried below the sea surface as the tide fills. There is a fixed type in which aquaculture nets are installed, and bamboo is used for the columns that fix the aquaculture nets.

Bamboo is cheap and can be easily procured, but its useful life is as short as 2 to 3 years, and work efficiency is poor due to the need for preparations such as knotting. In recent years, Poly Vinyl Chloride; Resin pipes such as Fiber Reinforced Plastic (abbreviated as PVC) or Fiber Reinforced Plastic (abbreviated as FRP) are used.

The installation of aquaculture nets begins in September every year, and in April of the following year, all of them, including the pillars, will be removed. The installation and removal of such columns are performed manually, and the seaweed farmer must install and remove 2000 to 3000 columns, and the work requires a great deal of labor.

PVC and FRP pipes, which are widely used these days, have a history of being developed as a substitute for bamboo, and because they follow the strength and shape of bamboo, they have an outer diameter of φ60 mm and a weight of about. It is heavy at 1.2 kg / m and its durability has increased several times, but the point that heavy labor is required for installation and removal work has not been improved at all.

In addition, since the pipe has an outer diameter of φ60 mm, the inside is hollow, and if it is installed in the sea, the installed columns may come off due to buoyancy. The structure is such that seawater enters the inside of the pipe. Therefore, the weight of the pipe becomes heavier, which is a factor that requires a great deal of labor for installation / removal work.

A conventional technique for solving such a problem is described in, for example, Patent Document 1. In this prior art, a plastic tubular body is spliced at both ends of one or a plurality of spliced joints to form a spliced tubular body, and the spliced tubular body is partitioned by the spliced knots. A plastic tubular body, which is a strut structure used for cultivating marine products, is described by providing an airtight space.

The spliced joint body and the tubular body are molded with a molded resin material mixed with a foam material to reduce the weight of the spliced tubular body, facilitate the transportation and installation of the spliced tubular body, and use a fiber material as the resin material. It is mixed to improve the strength of the spliced joint and the tubular body.

Other prior art are described, for example, in Patent Document 2. In this conventional technique, a core material made of a thin-walled steel pipe having a thickness of about 1.2 mm, a coating layer made of a metal material containing copper and covering the inner peripheral surface and the outer peripheral surface of the core material, and a core material and a coating layer. Described is a tubular member that is a strut structure, provided with a tapered portion provided at one end of a tubular body composed of.

By using a thin-walled steel pipe as the core material, the tubular member secures strength and bending as a support, and the inner surface and outer surface of the core material are made of a metal material containing copper, and the coating layer is made of a metal material containing copper, so that marine organisms such as shellfish Adhesion is suppressed.

Japanese Unexamined Patent Publication No. 10-178948 Japanese Unexamined Patent Publication No. 2001-28958

In the prior art described in Patent Documents 1 and 2, the support structure is basically configured as a substitute for bamboo, so that the weight is lighter than that of bamboo. In order to install it in the place, 2000 to 3000 stanchions must be transported by a work boat, pierced into the seabed manually and erected, and all stanchions must be manually removed at the time of taking in seaweed. However, there is a problem that a great deal of labor is required for the seaweed farmer.

Such problems are not limited to the pillars of the above-mentioned seaweed farming equipment, for example, aquaculture nets for marine organisms such as oysters and fish, protective nets for soil crops, various nets such as shading nets, strings, ropes, etc. Similarly, for mooring columns, a lightweight column structure capable of reducing the labor of manual installation work and removal work is desired.

An object of the present invention is to provide a lightweight strut structure capable of reducing the labor of manual installation work and removal work.

The present invention includes a long cylindrical support body made of synthetic resin and
It is made of metal and includes a reinforcing member inserted into the strut body so that the central axis is coaxial with the center axis of the strut body.
The support body is
A plurality of thin-walled portions that form a part of a cylindrical body and are provided apart from each other in the circumferential direction.
A plurality of thick-walled portions provided between two thin-walled portions adjacent to each other in the circumferential direction and protruding inward from the two thin-walled portions, and having a concave receiving surface formed on the inner peripheral portion. Has a part
The reinforcing member is
Cylindrical base and
The strut structure is characterized in that it extends radially from the base portion to each receiving surface of the plurality of thick-walled portions, and the tip portion has a plurality of ridge portions that come into contact with each receiving surface.

Further, the present invention is characterized in that a flat outer surface is formed on the outer peripheral portion of the plurality of thick portions.

Further, the present invention is characterized in that the reinforcing member has a stiffening portion that extends radially from the central axis of the reinforcing member and is connected to the inner peripheral surface of the base portion.

According to the present invention, a metal reinforcing member is coaxially inserted into a support body made of synthetic resin made of a long tubular body, and the reinforcing member protrudes from a receiving surface formed in a thick portion of the support body. Since the contact surfaces of the strips come into contact with each other, when the reinforcing member is inserted into the strut body, the frictional resistance force that the reinforcing member receives from the strut body can be reduced, and the reinforcing member can be easily inserted into the strut body. The production of the strut structure can be facilitated, and the reinforcing member can be prevented from rotating in the circumferential direction in the strut body. Further, when the reinforcing member is inserted into the column body, the contact surface of the reinforcing member is in contact with the receiving surface of the column body, so that a gap can be formed between the column body and the reinforcing member. As a result, an appropriate bending rigidity can be obtained for the strut structure, and it is possible to realize a highly durable strut structure having a bending rigidity like bamboo while having a small diameter and light weight. As a result, it is possible to significantly reduce the labor required for the manual installation work of the support column structure at the installation site and the removal work of the support column structure at the installation site.

Further, according to the present invention, since a flat outer surface is formed on the thick portion of the support column body, the support column structure is placed on a predetermined mounting surface during transportation and storage. It is possible to prevent the support column structure from rolling and inadvertently moving due to the inclination of the surface, and it is possible to improve the convenience of use.

Further, according to the present invention, the reinforcing member is connected inward in the radial direction from the position where the plurality of ridges are provided at the base portion, and has a rigid portion that is axisymmetric with respect to the second axis, so that the reinforcing member has a small diameter but is high. A strut structure having flexural rigidity can be obtained, and even if a large external force acts on the strut structure, damage such as bending, warping, and breakage of the strut structure can be prevented.

It is a cross-sectional view perpendicular to the axis which shows the support column structure 1 of one Embodiment of this invention, and shows the cross section seen from the cut plane line I-I of FIG. It is sectional drawing which simplifies and shows the seaweed culture equipment 3 in which the seaweed culture net 2 is moored by the support column structure 1. It is an axis right-angled cross-sectional view which shows the support column main body 4. It is a cross-sectional view at right angle to the axis which shows the reinforcing member 5. It is a cross-sectional view perpendicular to the axis which shows the support column structure 1a of another embodiment of this invention.

FIG. 1 is an axially perpendicular cross-sectional view showing a support column structure 1 according to an embodiment of the present invention, and shows a cross section seen from the cut plane line I-I of FIG. FIG. 2 is a cross-sectional view showing a simplified seaweed cultivation facility 3 in which the seaweed cultivation net 2 is moored by the support column structure 1. The strut structure 1 of the present embodiment is composed of a strut body 4 made of a synthetic resin and a long tubular body having the first axis L1 as the central axis, and metal, and the second axis L2 is the central axis. A reinforcing member 5 inserted into the support column body 4 so that the second axis L2 is coaxial with the first axis L1 is provided.

The strut structure 1 constitutes a rod-shaped portion extending in a straight line, and the conical portion 6 is coaxially fixed to one end of the rod-shaped portion in the longitudinal direction, and is used as a strut for mooring the seaweed culture net 2 as a whole. As the synthetic resin constituting the support column body, for example, polyvinyl chloride (abbreviated as PVC) can be used, but in other embodiments, fiber reinforced plastic (abbreviated as FRP) may be used. Good. As the polyvinyl chloride, a product name "RIKEN COMPOUND" manufactured by RIKEN TECHNOS CORPORATION can be used.

The strut structure 1 provided with the conical portion 6 is mounted on a work boat and transported to a farm, and is manually inserted into the seabed 20 one by one, and the seaweed farming net 2 is made of a string or rope. Moored by rope. At low tide, the sea level 21 is lowered, so that the portion of each strut structure 1 from the upper end to 2 to 3 m below the sea level protrudes from the sea level 21, and the seaweed culture net 2 is exposed above the sea level 21. .. As the tide rises, the sea level 21 rises, the seaweed culture net 2 is immersed under the sea surface 21, and only the upper end of each support column structure 1 protrudes from the sea surface 21, and almost the entire support column structure 1 and the seaweed culture net are formed. 2 is buried in the sea.

In the support column structure 1, when the support column body 4 is made of polyvinyl chloride, for example, a long molding material that is continuously formed by extrusion molding is provided with a required length, for example, 2.0 m, 2.5 m, 3. A short material is manufactured by cutting it to a standard length of 0 m, 3.5 m, or 4.0 m, and a plurality of short materials are connected to form a column having a required length. You may. Further, when the support column main body 4 is made of fiber reinforced plastic, a support column having a required length may be formed by a pultrusion molding method or the like. Examples of the reinforcing fiber include glass fiber, aramid fiber, and carbon fiber. Examples of the matrix resin include thermosetting resins such as epoxy resin, unsaturated polyester resin, phenol resin, polyurethane resin and polyimide resin, and thermoplastic resins such as polyamide resin, polycarbonate resin and polyethylene resin.

In the seaweed farming facility 3, when a seaweed farmer transports 2000 to 3000 columns to a seaweed farm by a work boat, the outer diameter D1 of the column structure 1 is 29 mm, and the outside of the columns of the prior art. Since it is about half the diameter, the weight is significantly reduced and the occupied volume during loading is also reduced. As a result, the number of mounts on the work vessel can be increased, so that the number of times the support column structure 1 is transported by the work vessel can be reduced to about 1/2 or less of the conventional one, and the handleability and transportability are improved. be able to.

FIG. 3 is an axially perpendicular cross-sectional view showing the support column main body 4. The support column main body 4 is arranged between a plurality of thin-walled portions 7a, 7b, 7c, 7d forming a part of a cylindrical body (4 in the present embodiment) and a plurality of thin-walled portions 7a to 7d, and the plurality of thin-walled portions 7a to 7d. It has a plurality of thick portions 10a, 10b, 10c, 10d (4 in this embodiment) protruding inward in the radial direction from the virtual cylindrical surface 9 including the inner surfaces 8a, 8b, 8c, 8d of 7a to 7d. .. The inner peripheral portions of the plurality of thick portions 10a to 10d are curved in a concave shape facing inward in the radial direction on a virtual plane perpendicular to the first axis L1 and extend parallel to the first axis L1. , 11b, 11c, 11d, respectively.

The plurality of thick portions 10a to 10d have outer surfaces 15a, 15b, 15c, and 15d forming a plane perpendicular to the radial line passing from the second axis L2 to the central portion in the circumferential direction of each thick portion 10a to 10d.

Taking the main dimensions of the support column body 4 as an example, the outer diameter D1 of the thick portion 10a to 10d is D1 = 29 mm, the outer diameter D2 of the thin portion 7a to 7d is D2 = 30 mm, and the outer diameter D2 of the thin portion 7a to 7d. The inner diameter D3 is D3 = 26 mm, the inner diameter D4 at the most distant position between the two receiving surfaces 11a, 11c (or 11b, 11d) facing each other on one diameter line is D4 = 25 mm, and the curvatures of the respective receiving surfaces 11a to 11d. The radius R1 is R1 = 2.5 mm.

FIG. 4 is a cross-sectional view taken along the axis showing the reinforcing member 5. The reinforcing member 5 has a cylindrical base portion 12 and a plurality of ridge portions 13a, 13b, 13c, 13d extending from the base portion 12 toward the receiving surfaces 11a to 11d of the thick portions 10a to 10d. At the tips of the plurality of ridges 13a to 13d, a plurality of thick portions extending in parallel with the second axis L2, which are curved outward in the radial direction on a virtual plane perpendicular to the second axis L2. A plurality of contact surfaces 14a, 14b, 14c, 14d that come into contact with the receiving surfaces 11a to 11d of the 10a to 10d are formed, respectively.

The reinforcing member 5 has stiffening portions 16a, 16b, 16c, 16d that are axially symmetric with respect to the second axis L2, which are connected inward in the radial direction from the positions where the plurality of ridge portions 13a to 13d of the base portion 12 are provided.

Taking the main dimensions of the reinforcing member 5 as an example, the outer diameter D5 of the base 12 is D5 = 17.8 mm, the inner diameter D6 of the base 12 is D6 = 15.0 mm, and the contact surfaces 14a, 14b, 14c, 14d. The radius of curvature R2 of is R1 = 2.5 mm, and is the same as the radius of curvature R1 of each receiving surface 11a to 11d (R1 = R2).

According to the above configuration, the metal reinforcing member 5 is coaxially inserted into the support body 4 made of synthetic resin made of a long tubular body, and formed in the thick portions 10a to 10d of the support body 4. Since the contact surfaces 14a to 14d of the ridges 13a to 13d of the reinforcing member 5 come into contact with each of the receiving surfaces 11a to 11d, when the reinforcing member 5 is inserted into the support column body 4, the reinforcing member 5 comes from the support column body 4. The frictional resistance force received can be reduced, and the reinforcing member 5 can be easily inserted into the support column body 4, the production of the support column structure 1 can be facilitated, and the reinforcing member 5 has an axis in the support column body 4. It is possible to prevent the rotation around L1 and L2, that is, the rotation in the circumferential direction.

Further, in the state where the reinforcing member 5 is inserted into the column body 4, the contact surfaces 14a to 14d of the reinforcing member 5 are in contact with the receiving surfaces 11a to 11d of the column body 4, so that the column body 4 and the reinforcing member 5 are in contact with each other. Voids 17a, 17b, 17c, 17d can be formed between the two. As a result, an appropriate bending rigidity can be obtained for the support column structure 1, and it is possible to realize a highly durable support column structure 1 having a bending rigidity like bamboo while having a small diameter and light weight. As a result, it is possible to significantly reduce the labor required for the manual installation work of the support column structure 1 at the installation site and the removal work of the support column structure 1 at the installation site.

Further, since the outer surfaces 15a to 15d forming a flat surface are formed on the thick portions 10a to 10d of the support column main body 4, the support column structure 1 is placed on a predetermined mounting surface during transportation and storage. At this time, it is possible to prevent the support column structure 1 from rolling and inadvertently moving due to the inclination of the mounting surface, and it is possible to improve the convenience of use.

Further, the reinforcing member 5 has a rigid portion 16a to 16d that is axially symmetric with respect to the second axis L2 and is connected inward in the radial direction from the position where the plurality of ridge portions 13a to 13d of the base portion are provided, so that the reinforcing member 5 has a small diameter. However, a strut structure 1 having high bending rigidity can be obtained, and even if a large load acts on the strut structure 1, damage such as bending, warping, and breakage of the strut structure can be prevented.

Since the reinforcing member 5 is provided with a plurality of stiffening portions 16a to 16d in the base portion 12, the spaces in the base portion 12 are provided by the stiffening portions 16a to 16d in a plurality of voids 18a and 18b (4 in the present embodiment). , 18c, 18d, and these voids 18a to 18d are sealed spaces by closing both ends of the reinforcing member 5 in the longitudinal direction, that is, in the second axis L2 direction with a filler such as a lid or resin. Can be. By making each of the voids 18a to 18d a closed space in this way, buoyancy can be obtained in water. Further, even if the support structure 1 is used as a support and pierced into the seabed 20 as shown in FIG. 2, no earth and sand, foreign matter, etc. on the seabed enter into each of the voids 18a to 18d, and seaweed, barnacles, and other shellfish do not adhere. , The strut structure 1 can be easily removed and removed.

FIG. 5 is an axially perpendicular cross-sectional view showing a support column structure 1a according to another embodiment of the present invention. The strut structure 1a of the present embodiment is similar to the strut structure 1 of the above-described embodiment, and the same reference numerals are given to the corresponding portions. The strut structure 1a of the present embodiment has a strut body 4 having three thick portions 10a, 10b, 10c at an angular interval of 120 ° in the circumferential direction with respect to the first axis L1, and a strut body 4 with respect to the second axis L2 in the circumferential direction. A reinforcing member 5 having three protrusions 13a, 13b, and 13c at an angle interval of 120 ° is provided.

Receiving surfaces 11a, 11b, 11c similar to those described above are formed on the inner peripheral portions of the thick portions 10a to 10c. Further, the contact surfaces 14a, 14b, 14c similar to those described above are formed on the ridge portions 13a to 13c, and the stiffening portions 16a, 16b, 16c similar to those described above are formed on the base portion 12. These thick portions 10a to 10c, the ridge portions 13a to 13c, and the stiffening portions 16a to 16c are provided axially symmetrically on a radial line extending radially in three directions with respect to the second axis L2.

Such a strut structure 1a has a configuration in which the contact surfaces 14a to 14c of the three ridge portions 13a to 13c of the reinforcing member 5 come into contact with the receiving surfaces 11a to 11c of the three thick portions 10a to 10c of the strut body 4. Therefore, the number of contact points between the support column body 4 and the reinforcing member 5 is reduced as compared with the above-described embodiment, and the insertion resistance force due to friction when the reinforcing member 5 is inserted into the support column body 4 can be reduced. It is possible to reduce the pushing force of the reinforcing member 5 into the support column main body 4. In other words, it is possible to increase the pushable distance of the reinforcing member 5 into the support column body 4 and to manufacture the long column structure 1a.

In the above-mentioned conventional technique, the outer diameter of the strut structure is φ60 mm, but by setting this to φ30 mm, the strut structure is securely gripped and the strut structure is subjected to human power when installing / removing by human power. It can be transmitted to the body without waste. In addition, by setting the outer diameter to 50% (= φ30 mm / φ60 mm) as described above, the required occupied space can be reduced to about 1/4 even when loading on a work boat, and the work boat can be used many times. There is no need to go back and forth, and the working time per day can be greatly reduced.

Furthermore, the installation work of the strut structure requires 100 to 150 pieces / day according to the high tide, and the work boat is equipped with only about 30 to 50 pieces if the strut structure has an outer diameter of φ60 mm. Because it cannot be done, it is necessary to make a round trip on a work boat two or three times or more, and this loading time causes a large work loss when the seaweed farm is offshore. Moreover, the working time is limited at high tide, and if the number of times the support column structure is loaded is only one, efficient work becomes possible. The present invention makes it possible to improve such work efficiency.

The weight of the above-mentioned prior art strut structure is about 1.2 kg / m, and each strut is about 8 kg to about 12 kg, but according to the present invention, it is about 700 g / m, which is the strut of the prior art. The weight can be 60% or less of the structure. Further, since the present invention has a configuration in which the metal reinforcing member 5 is inserted into the synthetic resin strut body 4 and integrated, the strut structure is lifted by buoyancy in the sea with a specific gravity of about 1.1. It is possible to surely avoid the occurrence of a problem that the product is stored. As a result, it is possible to realize a closed structure of the strut structure, and it is possible to prevent mud and seawater from entering the inside of the strut structure.

Further, when installing the support column structure, the installation work is very difficult because the insertion resistance of the seabed 20 due to the mud is large, and depending on the situation of the seabed 20 such as the mud being hard, it is pierced with high pressure water. If the guide hole is not formed, the support column structure cannot be inserted and securely installed. In addition, when removing the mud that has entered the inside of the support column structure, the workability is also deteriorated. The strut structure installed by being inserted into the seabed 20 is subject to a large load due to wind, waves, tidal currents, etc., and may be damaged. According to the present invention, by reducing the outer diameter of the strut structure, such a load can be significantly reduced and the causes of breakage can be drastically reduced.

Further, in the prior art, when the strut structure is manufactured by one pipe of 6 m to 10 m, if it is damaged, it cannot be reused and is disposed of. On the other hand, in the present invention, since the strut structure can be easily cut to an arbitrary length, the damaged portion is excised, and a new strut structure is formed in the excised portion by using a separately prepared joint or the like. It can be connected and reused. In addition, the required length of the strut structure differs depending on the location of the farm in the current fiscal year, and even if a strut structure with a different length is required, the strut structure is cut off and the required length is required. Since it can be shortened to or extended by connecting the strut structure, it is not necessary to purchase a new strut structure having a different length, and the financial burden can be reduced.

In the present invention, the material of the reinforcing member 5 is not limited to the aluminum alloy described above, and other metals such as magnesium, iron, tin, chromium and manganese can be used. Further, the support structure is not limited to the support for mooring the seaweed culture net, and may be used for other purposes such as a support for a vinyl house, a tent, a protective fence for soil crops, and the like.

1 Strut structure 2 Nori aquaculture net 3 Nori aquaculture equipment 4 Strut body 5 Reinforcing member 6 Conical part 7a to 7d Thin part 8a to 8d Inner surface 9 Virtual cylindrical surface 10a to 10d Thick part 11a to 11d Receiving surface 12 Base 13a to 13d Protrusions 14a to 14d Contact surface 15a to 15d Outer surface 16a to 16d Stiffening part L1 1st axis L2 2nd axis

Claims (3)

A long cylindrical strut body made of synthetic resin,
It is made of metal and includes a reinforcing member inserted into the strut body so that the central axis is coaxial with the center axis of the strut body.
The support body is
A plurality of thin-walled portions that form a part of a cylindrical body and are provided apart from each other in the circumferential direction.
A plurality of thick-walled portions provided between two thin-walled portions adjacent to each other in the circumferential direction and protruding inward from the two thin-walled portions, and having a concave receiving surface formed on the inner peripheral portion. Has a part
The reinforcing member is
Cylindrical base and
A strut structure characterized by having a plurality of ridges extending radially from the base portion to each receiving surface of the plurality of thick portions and having a tip portion contacting each receiving surface. The support column structure according to claim 1, wherein a flat outer surface is formed on the outer peripheral portion of the plurality of thick portions. The strut structure according to claim 1 or 2, wherein the reinforcing member has a stiffening portion that extends radially from the central axis of the reinforcing member and is connected to the inner peripheral surface of the base portion.

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