Raft module and polyethylene floating raft

Abstract

To provide a raft module in which a local assembly work time can be shortened, borrowing of a very large assembly yard according to a size of a raft can be completed in a short term, a common truck can load the raft module thereon easily, and a large buoyancy can be generated with light weight, and provide a prefabricated polyethylene-made floating body raft.SOLUTION: A raft module is provided in which linear multiple polyethylene-made pipes having a structure with both ends being tightly closed are disposed in a predetermined configuration and connected by predetermined connecting means, and a size enabling truck transportation is provided. The raft module is used as a prefabricated member, and the multiple raft modules are provided by connecting each connection part of the connection between ends of a long body of the raft module, the connection between the ends of a short length body of the raft module, or the connection between the end of the long body of the raft module and the end of the short length body of the raft module, by the predetermined connecting means.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to factory-manufactured raft modules for use in prefabricated oyster rafts, bivalve rafts and aquaculture rafts, and to prefabricated polyethylene floating rafts assembled and connected together using the raft modules. [Background technology]

[0002] Patent Document 1 discloses an oyster cultivation raft for oyster cultivation, which comprises a floating body, a group of rails fixed on the floating bodies arranged in a row, horizontal rails fixed at appropriate intervals on each group of rails arranged in parallel and perpendicular to the rails, and pressure rails fixed at appropriate intervals perpendicular to the horizontal rails, and in which seedling strings of seedling strings or hanging strings of oyster seed attachment devices are suspended in the sea, and at least some of the rails, horizontal rails and pressure rails made of moso bamboo are replaced with resin pipes.

[0003] Patent Document 2 discloses a polyethylene raft for oyster farming in which a parent pipe is made up of multiple soft polyethylene tubular pipes or multiple pipes made by joining multiple hard polyethylene tubular pipes, and multiple hard polyethylene tubular pipes are used as child pipes, which are assembled in a lattice pattern, with the cross sections fastened and fixed with commercially available connectors made of synthetic resin, and covers attached to both ends of the child pipes, and the entire lattice pattern is placed on top of a float.

[0004] Patent Document 3 discloses an abandoned fish pen for temporary use in fishing grounds, which is made by attaching joining flanges to both end edges of a single pipe made of synthetic resin with a diameter of approximately 25 cm to 35 cm and a length of approximately 7 m to 14 m, assembling three or more of the above single pipes into an enclosure of a certain size in the sea of ​​a fishing ground, and attaching a cylindrical net with a bottom to the periphery of the enclosure.

[0005] Patent Document 4 discloses a fish farming pen that is constructed by assembling a plurality of raft members that are formed in an arc shape when viewed from above and have joint frames at both ends, and by connecting and fixing each of the joint frames of these raft members to form a circular raft body, and the raft members have a walkway at the top and a float at the bottom, and between the walkway and the float, top members, side members, and bottom members are formed into a lattice using rod-shaped steel material. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-154466 [Patent Document 2] Utility Model Registration No. 3059919 [Patent Document 3] Utility Model Registration No. 3107117 [Patent Document 4] Utility Model Registration No. 3182992 Summary of the Invention [Problem to be solved by the invention]

[0007] The invention in Patent Document 1 uses polyethylene pipes as rails to be placed on a floating body such as polystyrene foam, but there was a problem in that a large area corresponding to the size of the raft had to be secured for a long period of time because the polyethylene pipes had to be assembled on land near the installation site.

[0008] Furthermore, because a floating body such as polystyrene foam is required, work is required to assemble and secure each polyethylene pipe to the floating body, as well as to secure the polyethylene pipe to the floating body, which creates the problem of long construction times on land near the installation site.

[0009] The invention in Patent Document 2 involves connecting three 28m long soft polyethylene pipes or 9m long hard polyethylene pipes together to form a single parent pipe, and an 11m long hard polyethylene pipe to form a child pipe, which are assembled into a lattice-like raft and fixed with connectors.However, since the maximum length that can be loaded onto a typical truck is 9m, there was a problem in that a child pipe of at least 11m in length could not be transported overland without a special large truck.

[0010] Furthermore, since the buoyancy of the entire raft depends on the floats, the completed raft requires floats in addition to polyethylene pipes as an essential component, which is a hassle.

[0011] Furthermore, in order to assemble the polyethylene pipes into a raft on land near the installation site, a large area corresponding to the size of the raft must be secured for a long period of time. In addition, since the polyethylene pipes must be assembled and secured one by one, as well as the polyethylene pipes and the floating structure must be secured, there is a problem that the work time on land near the installation site takes a long period of time.

[0012] The invention of Patent Document 3 is a raft in which high-density polyethylene synthetic resin pipes 7 to 14 meters long are floating in the sea, and joining flanges attached to both ends of the synthetic resin pipes are joined with bolts and nuts. In all of Figures 1 to 3 of Patent Document 3, the joining flanges are attached to both ends of the synthetic resin pipes so as to secure the openings, and therefore the synthetic resin pipes are joined together with a considerable amount of seawater inside them. Since the buoyancy of the synthetic resin pipes themselves is small, it is possible to suspend a net for a fish cage, which is much lighter than an oyster raft, but when an important object such as an oyster raft is suspended, the synthetic resin pipes, which have little buoyancy, sink into the sea, causing the oyster raft to sink to the seabed, which causes the problem of farmed oysters not growing.

[0013] In particular, the Seto Inland Sea is a place where many ships navigate, and because only a small portion of the synthetic resin pipes of the fish pens protrude above sea level, they are difficult to see from ships at night, posing a risk of ships colliding with the synthetic resin pipes of the fish pens. As shown in Figure 4 of Patent Document 3, the synthetic resin pipes are connected to form a large ring, but because the synthetic resin pipes are connected to each other so that air and seawater can flow through them, if a ship collides with one of the synthetic resin pipes and damages it, causing seawater to flow into the pipes, this inflowing seawater will fill all of the synthetic resin pipes, causing the fish pens to sink to the seabed.

[0014] The invention of Patent Document 4 is a raft in which the arc-shaped raft members are made from steel rods formed into an arc shape, and the raft members are connected to each other by connecting and fastening joint frames attached to both ends of the raft members with bolts and nuts on the sea, and the raft members are placed and fixed on floats, and floated on the sea by the buoyancy of the floats. The use of steel rods makes the raft heavy, which causes problems such as high transportation costs; the use of steel rods as a frame means means for people to walk on, which makes it impossible to use, unless a walkway means such as lath is provided; and the use of steel rods requires many floats as floating structures.

[0015] The present invention was devised in consideration of these problems, and its objective is to provide a raft module and a prefabricated polyethylene floating raft that can shorten the time required for on-site assembly and connection work, allow for the rental of a large area of ​​land corresponding to the size of the raft to be completed in a short period of time, can be easily loaded onto a standard truck, is lightweight, and can generate large buoyancy. [Means for solving the problem]

[0016] In the present invention, puzzle-type assembly pieces refer to pieces that can be assembled in advance to form a desired raft shape, such as a ring, a lattice, or a bar, to complete the raft.

[0017] The raft module according to claim 1 is a component of a raft used for bivalve farming, including oyster rafts, and is a puzzle-type assembly piece having connecting portions in the front-rear and left-right directions, and the raft module has a sealed structure at both ends. and linking site A straight set of polyethylene pipes Arranged in the left-right and front-back directions The raft is characterized by having the necessary buoyancy for use in bivalve farming, due to its configuration when arranged in a predetermined form.

[0018] The raft module described in claim 2 is characterized in that, in claim 1, the straight polyethylene pipe, both ends of which have a sealed structure and are connecting portions, is arranged in a predetermined shape, and is provided with two or more front-to-back, left-to-right connecting portions that can be connected in the front-to-back and left-to-right directions.

[0019] The raft module described in claim 3 is characterized in that, in claim 1 or 2, the specified form is a frame body that is approximately rectangular in plan view, in which a plurality of long, straight bodies, each made of polyethylene pipes with both ends sealed, are arranged in parallel at a specified interval as a raft, and a plurality of short, straight bodies, each made of polyethylene pipes with both ends sealed or open, are arranged at both ends of the long bodies in approximately perpendicular directions, and the two ends of each body are connected to each other by a specified connecting means.

[0020] The raft module according to claim 4 is 3 In the above, the side portions of the frame body, which is approximately rectangular in plan view, consisting of elongated bodies, are arranged by arranging two elongated bodies adjacent to each other in parallel, or by arranging two elongated bodies in a row parallel to each other with a gap between them, thereby forming a pair of elongated bodies.

[0021] The raft module described in claim 5 is characterized in that, in claim 4, the two elongated bodies that constitute the two-piece elongated body portion are combined by being shifted in the longitudinal direction by at least the amount of the attachment range of the connecting means provided at the end of the elongated bodies.

[0022] The raft module according to claim 6 is 3~5 In either of the following cases: The connecting means is characterized by being electrofusion bonding, heat fusion bonding, or fastening means using a string.

[0023] The raft module according to claim 7 is 3~6 In any one of the above, the raft module 、 By large truck , as determined by the safety standards for road transport vehicles It is characterized by its portable size.

[0024] Claim 8 Nopo The polyethylene floating raft is Pa Claims that involve sloppy assembly pieces 3~7 The plurality of raft modules described in any one of the above are connected to each other by using a module body connecting means at each connection site of connecting the ends of the long bodies of the raft modules, connecting the ends of the short bodies of the raft modules, or connecting the end of the long body of the raft module to the end of the short body of another raft module. Puzzle-style assembly possible It is characterized by being a raft.

[0025] Claim 9 Nopo The polyethylene floating raft according to claim 8 is a floating raft in which a plurality of the raft modules are connected in the longitudinal direction. In a state Linear, multiple raft modules are connected in the short direction In a state Arrange the raft modules in a parallel arrangement or in a rectangular frame arrangement. In a state It is characterized by its square-shaped form.

[0026] Claim 10 Nopo The polyethylene floating raft, as set forth in claim 8 or 9, is characterized in that the fixable module body connecting means is an electrofusion joint or heat fusion joint in which both ends of a polyethylene pipe of a predetermined length are joined via a straight, short joint body having a closed or open structure.

[0027] Claim 11 Nopo The polyethylene floating raft according to claim 8 or 9, The detachable module body connecting means is characterized by being a detachable means using a screw structure. [Effects of the Invention]

[0028] The raft module described in claim 1 has the effect of eliminating the need for floats such as polystyrene foam because both ends of the polyethylene pipe are sealed, allowing the polyethylene pipe itself to function as a float. Therefore, the high buoyancy of the sealed polyethylene pipe that functions as a float allows the raft module to suspend a relatively lightweight net that is hung down when making a fish cage, or a heavy hanging string that is hung down when cultivating oysters or bivalves.

[0029] The raft module is a versatile prefabricated component that can be used as a raft part, allowing multiple raft modules to be combined in various ways to prefabricate rafts of various shapes. Because there is only one type of prefabricated raft module, the raft module manufacturing process can be set up in advance as a process consisting of standard work that minimizes unnecessary labor and lambda. Since the raft module can be manufactured by repeating the standard work determined in a factory that is not affected by the weather, the effects of mass production are realized, which stabilizes manufacturing quality, reduces manufacturing costs, and shortens manufacturing lead times.

[0030] By designing the size of a single raft module so that it can be transported by, for example, a typical 10-ton truck, the raft module, which is a prefabricated component, can be easily transported to an on-site assembly yard, such as a beach near the sea where it will be installed.Since multiple raft modules can be prefabricated and assembled into rafts of a specified shape and size, the assembly time at the on-site assembly yard can be significantly reduced.

[0031] Furthermore, while many oyster rafts and other rafts are installed in the Seto Inland Sea, there is also a lot of ship traffic. Oyster rafts, bivalve rafts, and aquaculture rafts floating on the sea only rise to a small height above the water, making them difficult for passing ships to spot at night, creating the risk of ships colliding with them. For example, a conventional circular raft made of polyethylene pipes has interconnected polyethylene pipes that are connected to each other. Because polyethylene pipes are vulnerable to impacts from passing ships, if a ship collides with the polyethylene pipes that make up the raft, even a single breakage or hole can cause seawater to quickly fill the polyethylene pipe, causing the raft to sink to the seabed. In contrast, in the raft module of the present invention, each polyethylene pipe has a sealed structure and is buoyant, so even if a ship collides and one polyethylene pipe is damaged, allowing seawater to enter, seawater will not enter the majority of the other sealed polyethylene pipes, so the buoyancy of the raft will hardly change, and the raft will remain floating on the sea and will not sink to the seabed.

[0032] The raft module described in claim 2 is configured by arranging the straight polyethylene pipes, both ends of which have a sealed structure and connecting portions, in a predetermined shape, so that it has two or more left and right connecting portions in the front, back, left and right directions of the raft module that can be connected to other polyethylene pipes, making it easy to create various types of rafts.

[0033] The raft module described in claim 3 is in the form of two rows arranged parallel to each other at a predetermined distance as a raft, so that at the on-site assembly yard, it is possible to connect two rows together, compared to the comparative method of assembling bamboo one by one in each row to assemble a raft, thereby improving assembly work efficiency by approximately two times and significantly reducing assembly work time at the on-site assembly yard.

[0034] Furthermore, when an oyster raft is assembled with the specified spacing between the two rows set to, for example, 1.3 m, the hanging rows, which are made up of multiple stacked oyster cultivation containers each measuring approximately 0.7 m square in plan view and having lattice-shaped walls on all six sides, can be easily lifted using a winch or the like for harvesting, even at the specified spacing, which has the effect of making the lifting operation easier.

[0035] The raft module described in claim 4 has the effect of providing a foothold that is easy for people working on a floating raft on the sea, since a set of two sealed polyethylene pipes provides a larger surface area for feet compared to a single sealed polyethylene pipe.

[0036] The raft module described in claim 5 has the longitudinal ends of the two elongated bodies that make up the raft module shifted so that they form a single connecting portion.This means that only one connection is required instead of two connections, as would be the case if the ends of the two sets were in the same longitudinal position, thereby making it easier to connect to other raft modules.

[0037] The raft module according to claim 6 has the advantage that the polyethylene pipe with a sealed structure, which is a constituent member, can be fixed in place in a simple manner.

[0038] The raft module described in claim 7 has the advantage that the raft module, which is a prefabricated member, can be easily transported anywhere in Japan, and the prefabricated polyethylene floating raft can be assembled anywhere in Japan in a short period of time.

[0039] The prefabricated polyethylene floating raft described in claim 8 has connectable structures on all four sides of its approximately rectangular shape when viewed in a plane, thereby achieving the effect of being able to assemble rafts of various shapes and sizes suitable for various applications.

[0040] The prefabricated polyethylene floating raft described in claim 9 shows the basic assembly form of the raft module, and has the effect of being able to be assembled into the raft desired to be installed according to the purpose.

[0041] The prefabricated polyethylene floating raft described in claim 10 has the effect of enabling the constituent raft modules to be fixed together using an optimal method for joining polyethylene pipes.

[0042] The prefabricated polyethylene floating raft described in claim 11 can be easily disassembled into raft modules and stored indoors, for example, when not in use or in bad weather, which prevents the polyethylene pipes from deteriorating due to ultraviolet rays.

[0043] In addition, if some of the raft modules are damaged, they can be replaced with raft modules that are in good condition at sea.

[0044] Furthermore, because assembly work can be carried out at sea, there is no need to secure an on-site assembly yard, which has the added benefit of reducing the hassle of negotiating with local residents. [Brief explanation of the drawings]

[0045] [Figure 1] 1A and 1B are explanatory diagrams of a raft module of the present invention, in which (a) is an explanatory diagram in plan view, and (b) is an explanatory diagram as seen from the left side as viewed from the arrow E in (a). [Figure 2] 1A and 1B are explanatory diagrams of plan views of polyethylene pipes with sealed structures at both ends, which are used in the raft module or prefabricated polyethylene floating raft of the present invention, where (a) is an explanatory diagram of a long, straight body, and (b) is an explanatory diagram of a short, straight body. [Figure 3] This is an explanatory diagram of a prefabricated polyethylene floating raft in which raft modules are arranged in a square shape when viewed from above and assembled in a prefabricated manner. [Figure 4] This is an explanatory diagram of a prefabricated polyethylene floating raft, assembled by connecting raft modules in the short direction in a plan view. [Figure 5] This is an explanatory diagram of a prefabricated polyethylene floating raft assembled by connecting raft modules longitudinally in a plan view. [Figure 6] This is an explanatory diagram of a hanging string of stacked aquaculture containers with approximately square lattice-shaped walls hanging from a prefabricated polyethylene floating raft. [Figure 7] FIG. 2 is an explanatory diagram of the end of the raft module of the present invention, illustrating the front-to-back, left-to-right connecting portions. DETAILED DESCRIPTION OF THE INVENTION

[0046] The raft module 1 and prefabricated polyethylene floating raft 2 of the present invention are used, for example, as oyster rafts, bivalve rafts, and aquaculture rafts with hanging strings, as shown in Figure 6. Conventionally, rafts were constructed by assembling bamboo pieces one by one in a seaside assembly yard, with the progress of construction dependent on the weather, as work could not be done in rainy weather. However, in a factory where the progress of construction is not dependent on the weather, mass-produced raft modules 1 are manufactured according to a production plan using standard work consisting of predetermined processes and procedures, and quality is guaranteed. This is how the raft is constructed. This has a first feature in that the raft is constructed by assembling mass-produced raft modules 1 as prefabricated components in a seaside assembly yard. The second feature is that, whereas conventionally, rafts used as floating bodies for floating bamboo on the sea were essential components for rafts, such as polystyrene foam, the floating bodies used in this raft are polyethylene pipes instead of bamboo, which themselves serve as floating bodies, eliminating the need for polystyrene foam or other floating bodies. The raft module 1 and the prefabricated polyethylene floating raft 2 will be described below.

[0047] First, we will explain the raft module 1. As shown in Figure 1, the raft module 1 is a prefabricated component of a raft used for bivalve farming, including an oyster raft, which is a prefabricated structure, and is a puzzle-style assembly piece with connecting parts in the front, back, left, and right directions. The raft module 1 has a configuration in which multiple linear polyethylene pipes 7a, both ends of which are sealed, are arranged in a predetermined shape, thereby providing the buoyancy required for a raft used for bivalve farming.

[0048] The raft module 1 is configured by arranging a plurality of linear polyethylene pipes 7a, each with a sealed structure at both ends, as a long body 3 in a predetermined configuration, as shown in FIG. 1, for example.

[0049] In addition, the raft module 1 is configured by arranging the straight polyethylene pipe 7a, both ends of which have a sealed structure and connecting portions 15, in a predetermined shape, and is provided with two or more front-to-back, left-to-right connecting portions 25 in the front-to-back, left-to-right directions of the raft module 1, which can be connected to other raft modules 1, as shown in Figure 1 or Figure 7.

[0050] The polyethylene pipe 7a has an inner diameter of, for example, about 100 to about 200 mm and a thickness of 3 to 15 mm, and the inner diameter or thickness is selected to be suitable for ensuring the necessary strength and rigidity, taking into consideration the use and size of the pipe for oyster raft cultivation, bivalve cultivation, or fish pens.

[0051] The raft module 1 is small enough to be transported by a large truck, and therefore the length of the elongated polyethylene pipe 7a is preferably about 12 m or less, which is a length that can be loaded onto a typical large truck, and more preferably about 9 m to about 10 m, taking productivity and workability into consideration.

[0052] Furthermore, both ends of the long polyethylene pipe 7a are sealed with sealing means 6, such as polyethylene caps, as shown in Figure 2(a). Therefore, the polyethylene pipe 8a with both ends sealed is lightweight and has high buoyancy without requiring any other floating bodies such as polystyrene foam.

[0053] The raft module 1 is composed of a combination of a long body 3 and a short body 4, as shown in Figure 1. The long body 3 must be a plurality of linear polyethylene pipes 7a with sealed structures at both ends, but the short body 4 used to connect the long bodies 3 together may be short and have a shape that allows the long bodies 3 to be connected.

[0054] The short bodies 3 may be short and have a shape that allows the long bodies 3 to be connected together. Examples of such short bodies 3 include a straight polyethylene pipe 7b with both ends sealed, a straight polyethylene pipe with both ends open (not shown), various shapes of joint members (not shown) made of polymer compounds, various shapes of non-metallic joint members (not shown), and various shapes of metallic joint members (not shown), as shown in FIG. 2(b). Because the straight polyethylene pipe 7a with both ends sealed itself has high buoyancy, the short bodies 4 may not have buoyancy, and may be made of any material or shape that allows the long bodies 3 to be connected together. The length of the short bodies 4 is determined depending on the application of the raft module 1, etc., and is set to a length that allows the long bodies 3 to be spaced apart.

[0055] Next, we will explain the predetermined configuration of the raft module 1. For example, as an example, the predetermined configuration is a substantially rectangular frame in plan view, as shown in Figure 1, in which a plurality of linear, long bodies 3, each having a polyethylene pipe 7a with both ends sealed, are arranged in parallel at a predetermined interval as a raft, and a plurality of linear, short bodies 4, each having a polyethylene pipe 7b with both ends sealed or open, are arranged at both ends of the long bodies 3 in the substantially perpendicular direction, and the two ends are connected to each other by a predetermined connecting means.

[0056] 2(b), a polyethylene pipe 7b with both ends closed or open is used as the short body 4 in the embodiment. The polyethylene pipe 7b has an inner diameter of, for example, about 100 to about 200 mm and a thickness of 3 to 15 mm, and the inner diameter or thickness is selected to ensure the necessary strength and rigidity, taking into consideration the use and size of the pipe, such as for oyster raft farming, bivalve farming, or fish cages.

[0057] The polyethylene pipe 7b, which is a component of the raft module 1, is lightweight, and in the case of a polyethylene pipe 8b whose both ends are sealed with sealing means 6, in addition to the long body 3, each of the short bodies 4 itself has its own buoyancy, so the raft module 1 has extremely high buoyancy and can suspend extremely heavy hanging strings; and in the case of a polyethylene pipe 8b whose both ends are open, each of the long bodies 3 itself has its own high buoyancy, so it can suspend heavy hanging strings.

[0058] Furthermore, if the short body 4 is a joint member of various shapes made of a polymer compound, it can hang a heavy hanging string, and if it is a non-metallic joint member of various shapes or a metallic joint member of various shapes, it can hang a net for a fish cage.

[0059] Furthermore, when multiple linear, long bodies 3 are arranged in parallel at a predetermined distance K as a raft, the predetermined distance K can be any length, but it is preferable that the predetermined distance K be a distance that ensures the distance between two long body sections 30 that allows the hanging operation of the hanging series to be performed, as shown in Figure 1(a).

[0060] The spacing K may be, for example, a spacing that allows the hanging strings to be raised and lowered. For example, if the spacing K is 1.3 m, as shown in Figure 6, in the case of an oyster raft floating on the sea surface U, when the hanging strings 10, which are stacked culture containers 11 containing oysters and have, for example, approximately square lattice-like walls measuring 0.7 m square in a plan view, are landed using a winch or the like for harvesting, the hanging strings 10 can be landed from the sea area within the spacing K, i.e., from both sides of the pair of elongated body sections 30, thereby improving the ease of landing work. In the case of a hanging string 10 made of stacked culture containers 11 having approximately square lattice-like walls measuring 0.7 m square, if the spacing K is approximately 1 m, there is a high possibility that the hanging strings 10 and the pair of elongated body sections 30 will interfere with each other. Note that in the case of hanging strings made of wire (not shown), a spacing K of approximately 1 m may be used, and the spacing K may be set to be appropriate for the shape and size of the hanging strings.

[0061] The raft modules 1 are arranged in two parallel rows spaced apart by the distance K, but by manufacturing the two-row raft modules 1 in a factory, i.e., by configuring the prefabricated members in two rows, the amount of assembly work is halved compared to assembling the raft modules 1 one row at a time in an assembly yard near the fishing grounds, as two rows of raft modules 1 are already completed, thereby significantly reducing the work time in the assembly yard near the fishing grounds.

[0062] Next, the sides of the frame body, which is approximately rectangular in plan view, consisting of the elongated bodies 3, are arranged by arranging two elongated bodies 3 adjacent to each other in parallel, or by arranging two elongated bodies 3 in a row parallel to each other with a gap between them, thereby combining two of the elongated bodies 3 to form a pair of elongated body portions 30.

[0063] Methods for arranging two elongated bodies 3 side by side in parallel and fixing them include, for example, electrofusion joining, in which two recesses are formed along the outer peripheral surface of the two lined-up elongated bodies 3, or two holes are formed into which the two lined-up elongated bodies 3 are fitted, and a joint made of the same material as the elongated bodies 3 is prepared, and an electric heating wire embedded in the joint is heated to fuse and join the bodies, or a connection method in which the bodies are physically fastened with a string.

[0064] The pair of long body sections 30 are arranged in parallel to ensure safety when a person places their feet on the polyethylene pipe 7a to walk or work. A single pipe would make it extremely difficult for a person to walk or work on, and three pipes arranged in parallel would increase the manufacturing costs, so two pipes in parallel were chosen as this provides the best balance between safety and manufacturing costs.

[0065] Furthermore, when the elongated bodies 3 constituting the sides of the substantially rectangular frame are arranged adjacently or in a row, adjacent means that the pair of elongated body parts 30 are spaced so closely that they are almost touching, and row means that there is a gap between the pair of elongated body parts 30. In the case of row arrangement, there is a form in which the pair of elongated body parts 30 are added according to the purpose, such as fixing a plate-like scaffolding to the upper side of the pair of elongated body parts 30.

[0066] Both ends of the elongated body 3 are connecting portions 15 to which connecting means 5 are attached. For this reason, in the case of adjacent arrangement, the connecting portions 15 at both ends of the two elongated bodies 3 are almost in contact with each other, so the connecting means 5 cannot be attached, but in the case of side-by-side arrangement, there is a space between the two connecting portions 15 at both ends of the two elongated bodies 3, so the connecting means 5 can be attached.

[0067] Therefore, in the case of adjacent long bodies 3, the two long bodies 3 constituting the two-piece long body section 30 are combined by shifting them in the longitudinal direction by at least the amount of the attachment range of the connecting means 5 provided at the end of the long body 3.

[0068] In the embodiment, the pair of elongated bodies 30 is a case in which the two elongated bodies 3 are adjacent to each other in the short direction, as shown in Fig. 1, and in this adjacent state, both ends in the longitudinal direction are offset by the length of the sealed structure. If both ends were aligned, it would be impossible to ensure a space for attaching and constructing the connecting means 5a, so the offset is required to ensure this space.

[0069] Therefore, the two-piece long body portion 30 may have the following configurations: one in which both ends of the two pieces are aligned in the longitudinal direction with a gap between them in the lateral direction; one in which both ends of the two pieces are offset in the longitudinal direction with a gap between them in the lateral direction; or one in which both ends of the two pieces are offset in the longitudinal direction with the gap between them adjacent in the lateral direction.

[0070] Next, we will explain the connecting means 5a between the long body 3 and the short body 4 of the raft module 1. The connecting means 5a is electrofusion bonding, heat fusion bonding, or fastening means using a string.

[0071] The connecting means 5a (not shown) is used to connect the longitudinal ends of each of the two pairs of long bodies 30 to the ends of the short bodies 4 at connecting portions A1 to A4. The connecting means 5a may be a connecting method using a string as a restraining member to physically tighten the ends, an electrofusion joining method in which a joint made of the same material as the long body 30 and the short bodies 4 is interposed and an electric heating wire embedded in the joint is heated to fuse the two bodies, or a heat fusion joining method in which a joint made of the same material as the long body 30 and the short bodies 4 is interposed and the outer surface of the long body 3 and the inner surface of the joint, and the outer surface of the short body 4 and the inner surface of the joint are heated and melted using a dedicated heater, and the long body 3 and the short body 4 are inserted into the joint and crimped to connect the two bodies. Any of these connecting means may be used.

[0072] As shown in Figure 1, the raft module 1 has a roughly rectangular frame shape in plan view, and functions both as a prefabricated member and as a puzzle-style assembly piece with connecting portions in the front, back, left, and right directions. Rafts of various shapes can be assembled by preparing the appropriate number of raft modules 1 according to the shape and size of the raft, arranging them in the shape of a raft, and assembling them in a prefabricated manner. Below, we will explain a prefabricated polyethylene floating raft 2, which is a raft assembled in various shapes from the raft modules 1, which are both prefabricated members and puzzle-style assembly pieces.

[0073] Next, we will explain the prefabricated polyethylene floating raft 2. As an example, the prefabricated polyethylene floating raft 2 is a raft that is prefabricated by assembling a plurality of raft modules 1, which are prefabricated members and puzzle-style assembly pieces, using fixable or detachable module body connecting means 5b at each connection site, such as connecting the ends of the long bodies 3 of the raft modules 1 together as shown in connection portion B in Fig. 5, connecting the ends of the short bodies 4 of the raft modules 1 together as shown in connection portion B in Fig. 4, or connecting the end of the long body 3 of one raft module 1 to the end of the short body 4 of another raft module 1 as shown in connection portion B in Fig. 3.

[0074] The prefabricated polyethylene floating raft 2 can be in a linear form, as shown in Figure 5, where multiple raft modules 1 are connected longitudinally and assembled in a prefabricated manner; in a parallel form, as shown in Figure 4, where multiple raft modules 1 are connected transversely and assembled in a prefabricated manner; or in a U-shaped form, as shown in Figure 3, where multiple raft modules 1 are arranged in a square frame shape and assembled in a prefabricated manner.

[0075] The fixable module body connecting means 5b can be, for example, electrofusion or heat fusion bonding, in which both ends of a polyethylene pipe of a predetermined length are joined using a short, straight joint body 9 with a closed or open structure.

[0076] The detachable module body connecting means 5b may be, for example, a detachable means using a screw structure (not shown).

[0077] As an example of the prefabricated polyethylene floating raft 2, as shown in Figure 3, raft modules 1a, 1b, 1c and 1d, which are prefabricated members and also puzzle-style assembly pieces with connecting portions in the front-to-back, left-to-right directions, are arranged at each side of an approximately rectangular frame shape, and the connecting portions B1 to B4 are fitted with the coupling bodies 9a, 9b, 9c or 9d, and connected by a predetermined connecting means 5b, for example, a coupling body 9 made of the same material as the raft module 1 and the short body 4, and fused together, for example, by electrofusion or heat fusion joining.

[0078] Therefore, by arranging multiple raft modules 1 of the same shape and size, which are prefabricated members and puzzle-style assembly pieces with connecting parts in the front, back, left, and right directions, and assembling them in a prefabricated manner, a prefabricated polyethylene floating raft 2a in the shape of a square frame, i.e., approximately a square-shaped frame, can be constructed.

[0079] Furthermore, as shown in Figure 4, raft modules 1e, 1f, 1g and 1h, which are prefabricated members and puzzle-style assembly pieces with connecting portions in the front, back, left and right directions, are arranged side by side in the short direction, and the joint bodies 9e, 9f, 9g, 9h, 9j or 9k are interposed between connecting portions B5 to B10, and a predetermined connecting means 5b, for example, a joint body 9 made of the same material as the raft module 1 and the short body 4, is interposed and they are connected by fusion, for example, electrofusion joining or heat fusion joining.

[0080] Therefore, by arranging multiple raft modules 1 of the same shape and size, which are made of prefabricated materials and are puzzle-style assembly pieces with connecting parts in the front, back, left and right directions, and assembling them in a prefabricated manner, it was possible to assemble a parallel prefabricated polyethylene floating raft 2b.

[0081] Furthermore, as shown in Figure 5, the raft modules 1j, 1k, 1m and 1n, which are prefabricated members and puzzle-style assembly pieces with connecting portions in the front, back, left and right directions, are arranged vertically and linearly in the longitudinal direction, and the short bodies 9m, 9n, 9p, 9q, 9r or 9s are interposed between the connecting portions B11 to B16, and are connected by a predetermined connecting means 5b, for example, a joint body 9 made of the same material as the raft module 1 and the short body 4, and fusion, for example, electrofusion joining or heat fusion joining.

[0082] Therefore, by arranging multiple raft modules 1 of the same shape and size, which are prefabricated members and puzzle-style assembly pieces with connecting parts in the front, back, left and right directions, and assembling them in a prefabricated manner, a linear prefabricated polyethylene floating raft 2c can be assembled.

[0083] As shown in Figures 3 to 5, multiple raft modules 1 of the same shape and size, which are prefabricated members of the present invention and are also puzzle-style assembly pieces with connecting portions in the front-to-back and left-to-right directions, can be prefabricated together to create prefabricated polyethylene floating rafts 2 of various shapes and sizes suitable for fishing grounds. [Explanation of symbols]

[0084] 1 Raft Module 2 Prefabricated polyethylene floating raft 3 Long body 4 Short body 5 Connection means 6 Sealing means 7 Polyethylene pipe 8 Polyethylene pipe 9 Joint body 10 Drooping chain 11 Aquaculture container 15 Connection part 25 Front, rear, left and right connection parts 30 2 piece long body part A connection part B Connection part K interval

Claims

1. A raft module is a component of a raft used for bivalve farming, including oyster rafts, and is a puzzle-style assembly piece having connecting portions in the front-to-back and left-to-right directions, The raft module comprises: The raft module is characterized by having the buoyancy required for a raft to be used in bivalve farming, by being configured with multiple straight polyethylene pipes, both ends of which have sealed structures and connecting parts, arranged in a predetermined form in the left-right and front-to-back directions.

2. The raft module described in claim 1, characterized in that it has two or more front-to-back, left-to-right connecting portions that can be connected in the front-to-back and left-to-right directions by arranging the straight polyethylene pipes, both ends of which have sealed structures and connecting portions, in a predetermined shape.

3. The raft module described in claim 1 or 2, characterized in that the specified form is a frame form that is approximately rectangular in plan view, in which a plurality of long, straight bodies, each of which has a polyethylene pipe with a sealed structure at both ends, are arranged in parallel at a specified interval as a raft, and a plurality of short, straight bodies, each of which has a polyethylene pipe with a sealed or open structure at both ends, are arranged at approximately perpendicular angles to both ends of the long bodies, and the ends of each body are connected to each other by a specified connecting means.

4. A raft module as described in claim 3, characterized in that the sides of the frame body, which is approximately rectangular in plan view, consisting of elongated bodies, are arranged by placing two elongated bodies adjacent to each other in parallel, or by arranging two elongated bodies in a row parallel to each other with a gap between them, thereby forming a pair of elongated bodies.

5. A raft module as described in claim 4, characterized in that the two elongated bodies constituting the two-piece elongated body portion are combined by being shifted in the longitudinal direction by at least the amount of the attachment range of the connecting means provided at the end of the elongated body.

6. 6. The raft module according to claim 3, wherein the connecting means is electrofusion bonding, heat fusion bonding, or fastening means using a string.

7. A raft module according to any one of claims 3 to 6, characterized in that the raft module is of a size that can be transported by a large truck as defined by safety standards for road transport vehicles.

8. A polyethylene floating raft, characterized in that the raft can be assembled in a puzzle-like manner using a module body connecting means at each connection point between the ends of the long bodies of the raft modules, between the ends of the short bodies of the raft modules, or between the ends of the long bodies of the raft modules and the ends of the short bodies of other raft modules, wherein the raft modules are puzzle-style assembly pieces as described in any of claims 3 to 7.

9. A polyethylene floating raft as described in claim 8, characterized in that it is in the form of a straight line in which multiple raft modules are connected in the longitudinal direction, a parallel line in which multiple raft modules are connected in the short direction, or a square frame-like form in which multiple raft modules are arranged.

10. A polyethylene floating raft as described in claim 8 or 9, characterized in that the fixable module body connecting means is an electrofusion joint or heat fusion joint in which both ends of a polyethylene pipe of a predetermined length are joined via a straight, short coupling body with a sealed or open structure.

11. 10. The polyethylene floating raft according to claim 8 or 9, wherein the detachable module body connecting means is a detachable means using a screw structure.

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