Basket conveying device and method

Abstract

The basket transport device and method enable the basket to be transported appropriately. [Solution] A basket transport device for transporting a basket in which multiple storage compartments for storing radioactive material are partitioned, comprising: a suspension frame; a plurality of suspension rods suspended from the suspension frame and detachably inserted into and removed from the storage compartments; and locking parts provided at the lower ends of the plurality of suspension rods and detachably engaged with the constituent members of the storage compartments.

Description

Technical Field

[0001] This disclosure relates to a basket conveying device and method.

Background Art

[0002] At nuclear facilities, radioactive waste such as spent fuel generated in nuclear reactors is stored in radioactive material storage containers (casks), transported to storage facilities or reprocessing facilities, and stored or reprocessed. The radioactive material storage container is composed of a cylindrical body with a bottom and an open top, and a lid fixed to the upper part of the body to close the opening. Also, a basket capable of storing a plurality of radioactive wastes is arranged inside the body of the radioactive material storage container.

[0003] The basket is composed of a plurality of plate-like members combined in a lattice pattern. That is, the basket is composed of a plurality of first plate-like members arranged at intervals in the plate thickness direction and a plurality of second plate-like members arranged at intervals in the plate thickness direction, which are combined in orthogonal directions. By assembling the plurality of plate-like members in a lattice pattern, the basket forms a plurality of cells capable of storing radioactive waste. Such a basket is, for example, the one described in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The basket is constructed by assembling multiple plate-like members in a grid pattern, with the plate-like members fastened together by multiple bolts. The basket is transported with the plate-like members fastened together by the bolts and brought into the body. In other words, the crane lifts and transports the basket with the lifting device attached to the top of the basket. At this time, the lifted basket's own load acts on the bolts. Therefore, the basket has the challenge of becoming larger and heavier because the strength of the bolts needs to be increased.

[0006] This disclosure aims to solve the aforementioned problems and to provide a basket conveying device and method that enables the basket to be transported appropriately. [Means for solving the problem]

[0007] To achieve the above objective, the basket conveying device of the present disclosure is a basket conveying device for conveying a basket having a plurality of storage compartments for storing radioactive material, comprising: a suspension frame; a plurality of suspension rods suspended from the suspension frame and detachably inserted into and removed from the components of the storage compartments; and locking portions provided at the lower ends of the plurality of suspension rods and detachably engaged with the storage compartments.

[0008] Furthermore, the basket transport method of this disclosure is a basket transport method for transporting a basket in which a plurality of storage compartments for storing radioactive material are partitioned, and includes the steps of: lowering a suspension rod and inserting a locking portion provided at the lower end of the suspension rod into the storage compartment; stopping the locking portion at a predetermined position and moving the locking portion from a release position to a locking position for locking it into the storage compartment; and raising the suspension rod to raise the locking portion that is locked to a component of the storage compartment, thereby lifting the basket. [Effects of the Invention]

[0009] According to the basket conveying device and method of this disclosure, baskets can be conveyed appropriately. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a partially cutaway schematic diagram showing the internal structure of a radioactive material storage container. [Figure 2] Figure 2 is a horizontal cross-sectional view of the radioactive material storage container. [Figure 3] Figure 3 is a perspective view showing the basket of this embodiment. [Figure 4] Figure 4 is a perspective view showing the relationship between the first plate-like member and the first support member that constitute the basket. [Figure 5] Figure 5 is a perspective view showing the assembled state of the uppermost first plate-like member and the second plate-like member. [Figure 6] Figure 6 is a plan view showing the assembled state of the uppermost first plate-like member and the second plate-like member. [Figure 7] Figure 7 is a perspective view showing the assembled state of the bottom layer, the first plate-like member and the second plate-like member. [Figure 8] Figure 8 is a perspective view showing the assembly between the bottommost first plate-like member and the second plate-like member. [Figure 9] Figure 9 is a perspective view showing the lowest layer of the basket assembly method. [Figure 10] Figure 10 is a perspective view showing the lowest layer of the basket assembly method. [Figure 11] Figure 11 is a perspective view showing the lowest layer of the basket assembly method. [Figure 12] Figure 12 is a perspective view showing the lowest layer of the basket assembly method. [Figure 13] Figure 13 is a perspective view showing the lowest layer of the basket assembly method. [Figure 14] Figure 14 is a perspective view showing the lowest layer of the basket assembly method. [Figure 15] Figure 15 is a perspective view showing the lowest layer of the basket assembly method. [Figure 16]Figure 16 is a perspective view showing the assembled state of the plate-like member in the method of assembling the basket. [Figure 17] Figure 17 is a perspective view showing the assembled state of the support member in the method of assembling the basket. [Figure 18] Figure 18 is a perspective view showing the assembled state of the support member in the method of assembling the basket. [Figure 19] Figure 19 is a perspective view showing the assembled state of the support member in the method of assembling the basket. [Figure 20] Figure 20 is a plan view showing the basket conveying device. [Figure 21] Figure 21 is a front view showing the suspension unit. [Figure 22] Figure 22 is a side view showing the suspension unit. [Figure 23] Figure 23 is a front view showing the operating state of the suspension unit. [Figure 24] Figure 24 is a schematic view showing the method of conveying the basket. [Figure 25] Figure 25 is a schematic view showing the method of conveying the basket.

Mode for Carrying Out the Invention

[0011] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited by this embodiment, and when there are a plurality of embodiments, those configured by combining each embodiment are also included. In addition, the constituent elements in the embodiment include those that can be easily assumed by those skilled in the art, substantially the same ones, and those within the so-called equivalent range.

[0012] <Radioactive substance storage container> Figure 1 is a partially cutaway schematic view showing the internal structure of the radioactive substance storage container, and Figure 2 is a horizontal cross-sectional view of the radioactive substance storage container.

[0013] As shown in Figures 1 and 2, the cask 11, as a radioactive material storage container, comprises a body portion 12 and a lid portion 13. The body portion 12 has a container body 21. The container body 21 is cylindrical (in this embodiment, cylindrical in shape), with an opening 22 formed at its upper end and a closed lower end. The container body 21 has a cavity 23 inside, and a basket 24 is placed in the cavity 23. The basket 24 is provided with a plurality of cells (storage sections) 25 capable of individually storing radioactive materials (e.g., spent fuel assemblies). The container body 21 is a forged product made of carbon steel having a gamma-ray shielding function. However, stainless steel may be used instead of carbon steel for the container body 21. Alternatively, the container body 21 may be a casting made of spheroidal graphite cast iron or carbon steel cast steel.

[0014] The body portion 12 has an outer cylinder 26 positioned with a gap between it and the outer surface of the container body 21. Multiple copper heat transfer fins 27 are provided between the outer surface of the container body 21 and the inner surface of the outer cylinder 26, spaced apart in the circumferential direction to conduct heat. In the body portion 12, a resin 28, which acts as a neutron shield, is positioned in the space enclosed by the container body 21, the outer cylinder 26, and the heat transfer fins 27. The resin 28 is a polymer material containing a large amount of hydrogen and contains boron or a boron compound having a neutron shielding function.

[0015] The body portion 12 is provided with a bottom portion 29 that protrudes below the closed lower end of the container body 21. The bottom portion 29 is formed to be smaller than the outer diameter of the container body 21. The bottom portion 29 has a space enclosed by the closed lower end of the container body 21, and resin (neutron shielding material) is placed in this space.

[0016] The body section 12 has trunnions 30 for suspending the cask 11 from the container body 21, which are provided at 90-degree or 180-degree intervals on the upper and lower parts of the cask 11. The trunnions 30 are provided from the container body 21 through the outer cylinder 26. The trunnions 30 protrude to the outermost part of the cask 11.

[0017] The lid portion 13 is positioned over the opening 22 of the container body 21. The lid portion 13 closes the opening 22 and seals the container body 21 (body portion 12). The lid portion 13 has a primary lid 31, a secondary lid 32, and a tertiary lid 33. The primary lid 31 is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays. The secondary lid 32 covers the primary lid 31 and is visible on the outside of the cask 11, and like the primary lid 31, is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays. A resin (neutron shield) 28 may be provided between the primary lid 31 and the secondary lid 32. The tertiary lid 33 is provided on the outside of the secondary lid 32, but the tertiary lid 33 may be omitted. The tertiary lid 33 is formed in a disc shape from carbon steel or stainless steel that shields against gamma rays, similar to the primary lid 31 and the secondary lid 32.

[0018] The primary lid 31 is fixed to the first stage portion 22a formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel. The secondary lid 32 is fixed to the second stage portion 22b formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel. Although not shown, metal gaskets are provided between the primary lid 31 and the first stage portion 22a and between the secondary lid 32 and the second stage portion 22b. The metal gaskets ensure airtightness between the primary lid 31 and the first stage portion 22a and between the secondary lid 32 and the second stage portion 22b. The tertiary lid 33 is fixed to the first stage portion 22c formed in the opening 22 of the container body 21 by bolts (not shown) made of carbon steel or stainless steel.

[0019] In a nuclear power plant, for example, multiple spent fuel assemblies are stored in each cell 25 of the basket 24 of the container body 21 and sealed by the lid 13. The cask 11 is transported, for example, from the nuclear power plant to a storage facility. During transport, the cask 11 is fitted with transport buffers (not shown). The transport buffers are fitted to the upper and lower parts of the body 12. The cask 11 is loaded on its side onto the cargo bed of a transport vehicle and transported to the storage facility.

[0020] The cask 11 is constructed by placing a basket 24 in the cavity 23 of the body 12 and fixing a lid 13 to the opening. The basket 24 is manufactured by assembling multiple components, and then transported by a basket transport device 100 (see Figure 20), which will be described later, and loaded into the cavity 23 of the body 12.

[0021] <Basket> Figure 3 is a perspective view showing the basket of this embodiment.

[0022] As described above, the container body 21 is provided with a cavity 23 that forms a cylindrical space inside. The cavity 23 is not limited to a perfect cylinder shape; it may have notches or other features around its perimeter. The basket 24 is placed in the cavity 23. The basket 24 is provided with multiple cells 25 capable of storing, for example, multiple spent fuel assemblies or other radioactive waste.

[0023] As shown in Figure 3, the basket 24 has a plurality of first plate-shaped members 41, a plurality of second plate-shaped members 42, a plurality of first support members 43, a plurality of second support members 44, and a plurality of third support members 45.

[0024] Multiple first plate-like members 41 are arranged at intervals in the thickness direction. Multiple second plate-like members 42 are arranged at intervals in the thickness direction. Multiple first plate-like members 41 and multiple second plate-like members 42 are combined in orthogonal directions. Multiple first plate-like members 41 and multiple second plate-like members 42 are assembled in a grid pattern to form a plate-like member assembly 51. Multiple plate-like member assemblies 51 are stacked vertically to form a basket body 52.

[0025] In this embodiment, the first plate-shaped member 41 and the second plate-shaped member 42 are each composed of seven pieces, but the number is not limited. The number of first plate-shaped members 41 and second plate-shaped members 42 is appropriately set according to the outer diameter of the basket 24, the size of the cavity 23, and the size and number of radioactive waste pieces to be contained.

[0026] The first support member 43, the second support member 44, and the third support member 45 are arranged in multiples on the outside of the basket body 52, along the vertical direction (the stacking direction of the plate-shaped member assembly 51) and spaced apart in the circumferential direction. The first support member 43 supports the longitudinal ends of some of the first plate-shaped members 41 among the multiple first plate-shaped members 41. The second support member 44 supports the longitudinal ends of some of the second plate-shaped members 42 among the multiple second plate-shaped members 42. The third support member 45 supports the longitudinal ends of some of the first plate-shaped members 41 among the multiple first plate-shaped members 41 and the longitudinal ends of some of the second plate-shaped members 42 among the multiple second plate-shaped members 42.

[0027] Figure 4 is a perspective view showing the relationship between the first plate-like member and the first support member that constitute the basket.

[0028] As shown in Figures 3 and 4, of the multiple (7) first plate-shaped members 41 in the bottom layer, three of the first plate-shaped members 41 located in the middle of the plate thickness direction are connected at their respective ends in the longitudinal direction to the lower end of the first support member 43. Similarly, of the multiple (7) first plate-shaped members 41 in the top layer, three of the first plate-shaped members 41 located in the middle of the plate thickness direction are connected at their respective ends in the longitudinal direction to the upper end of the first support member 43. In this case, the arrangement direction of the multiple (7) first plate-shaped members 41 in the bottom layer and the arrangement direction of the multiple (7) first plate-shaped members 41 in the top layer are the same.

[0029] The lowest plate-shaped member assembly 51 is formed by arranging multiple (7) second plate-shaped members 42 in a perpendicular direction above multiple (7) first plate-shaped members 41 of the lowest layer. The uppermost plate-shaped member assembly 51 is formed by arranging multiple (7) second plate-shaped members 42 in a perpendicular direction below multiple (7) first plate-shaped members 41 of the uppermost layer. Intermediate plate-shaped member assemblies 51 are arranged in multiple stages between the lowest plate-shaped member assembly 51 and the uppermost plate-shaped member assembly 51.

[0030] <Uppermost plate-like component assembly> Figure 5 is a perspective view showing the assembled state of the uppermost first plate-like member and the second plate-like member, and Figure 6 is a plan view showing the assembled state of the uppermost first plate-like member and the second plate-like member.

[0031] As shown in Figures 5 and 6, the uppermost plate-like member assembly 51A is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d in a grid pattern. That is, the plate-like member assembly 51A is constructed by combining a plurality of second plate-like members 42a, 42b, 42c, 42d, which are also spaced apart in the plate thickness direction, with a plurality of first plate-like members 41a, 41b, 41c, 41d, which are spaced apart in the plate thickness direction, from below in a direction perpendicular to the first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d, respectively. The plate-like member assembly 51A is constructed by combining a plurality of cells 25 along the vertical direction with spaces in the horizontal direction.

[0032] The first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d, although not shown in the figures, are constructed by overlapping a rigid plate material that serves as a strength member with a functional plate material that serves as a functional member in the thickness direction. Here, the functional member has one or more functions, either neutron absorption or thermal conductivity greater than or equal to that of the rigid plate material. The rigid plate material is made of, for example, carbon steel, stainless steel, or aluminum alloy. The functional plate material has a structure in which a ceramic layer containing boron carbide as a neutron absorber is wrapped in a stainless steel plate or aluminum alloy plate. Alternatively, the functional plate material may be made of an aluminum composite or aluminum alloy to which boron or a boron compound has been added as a neutron absorber. In addition to boron, gadolinium can be used in the functional plate material. In addition to aluminum or aluminum alloy, stainless steel can be used in the functional plate material.

[0033] The first plate-like members 41a, 41b, 41c, and 41d are arranged such that the first plate-like member 41a is the longest, and the lengths decrease in the order of 41b, 41c, and 41d. The first plate-like members 41a, 41b, 41c, and 41d are positioned to pass through the center of the plate-like member assembly 51A, and are arranged radially outward in the order of 41b, 41c, and 41d. The second plate-like members 42a, 42b, 42c, and 42d are arranged such that the second plate-like member 42a is the longest, and the lengths decrease in the order of 42b, 42c, and 42d. The second plate-like members 42a, 42b, 42c, and 42d are positioned to pass through the center of the plate-like member assembly 51A, and are arranged radially outward in the order of 42b, 42c, and 42d.

[0034] The first plate-like members 41a, 41b, 41c, and 41d have notches formed at their lower ends, and the second plate-like members 42a, 42b, 42c, and 42d have notches formed at their upper ends. The first plate-like members 41a, 41b, 41c, and 41d and the second plate-like members 42a, 42b, 42c, and 42d are assembled so that their notches fit together. In this embodiment, the height of the first plate-like members 41a, 41b, 41c, and 41d is lower than the height of the second plate-like members 42a, 42b, 42c, and 42d. However, the height of the first plate-like members 41a, 41b, 41c, and 41d may be the same as the height of the second plate-like members 42a, 42b, 42c, and 42d.

[0035] The first support members 43a and 43b have a hollow shape. However, the shape of the first support members 43a and 43b is not limited to a hollow shape, and may also have an L-shaped cross-section or a U-shaped cross-section. The first support member 43a has a roughly square tubular shape, and the first support member 43b has a triangular tubular shape. The first support members 43a and 43b are made of, for example, carbon steel, stainless steel, or aluminum alloy. The upper end of the first support member 43a is positioned between the end of the first plate-shaped member 41a and the end of each first plate-shaped member 41b. The upper end of the first support member 43b is positioned outside the end of each first plate-shaped member 41b. The end of the first plate-shaped member 41a and the upper end of each first support member 43a are connected by a connecting member (for example, a bolt) 61a. The ends of each first plate-like member 41b and the upper ends of each first support member 43a, 43b are connected by a connecting member (for example, a bolt) 61b.

[0036] The second support members 44a and 44b are hollow. However, the shape of the second support members 44a and 44b is not limited to a hollow shape, and may be L-shaped, U-shaped, or the like. The second support member 44a is approximately rectangular, and the second support member 44b is triangular. The second support members 44a and 44b are made of, for example, carbon steel, stainless steel, or aluminum alloy. The upper end of the second support member 44a is positioned between the end of the second plate-shaped member 42a and the end of each second plate-shaped member 42b. The upper end of the second support member 44b is positioned outside the end of each second plate-shaped member 42b. The end of the second plate-shaped member 42a and the upper end of each second support member 44a are connected by a connecting member (for example, a bolt) 62a. The ends of each second plate-shaped member 42b and the upper ends of each second support member 44a, 44b are connected by a connecting member (for example, a bolt) 62b.

[0037] The outermost second plate-shaped member 42d intersects with the ends of the first plate-shaped members 41a and 41b at its middle section, and with the ends of the first plate-shaped member 41c at its ends, with the upper ends of the first support members 43a and 43b located on its outer surface. The second plate-shaped member 42d and the first support members 43a and 43b are connected by connecting members (e.g., bolts) 61c and 61d. However, the connecting members 61c and 61d do not protrude toward the cell 25 side. The outermost first plate-shaped member 41d intersects with the ends of the second plate-shaped members 42a and 42b at its middle section, and with the ends of the second plate-shaped member 42c at its ends, with the upper ends of the second support members 44a and 44b located on its outer surface. The first plate-shaped member 41d and the second support members 44a and 44b are connected by connecting members (e.g., bolts) 62c and 62d. However, the connecting members 62c and 62d do not protrude toward the cell 25 side.

[0038] The plate-shaped member assembly 51A is constructed by combining a plurality of first plate-shaped members 41a, 41b, 41c, 41d located on the upper side with a plurality of second plate-shaped members 42a, 42b, 42c, 42d located on the lower side in an orthogonal direction. Of the plurality of first plate-shaped members 41a, 41b, 41c, 41d, the first plate-shaped member 41c, which is located on the outer side in the thickness direction, is provided with a first locking portion 63 at its end in the longitudinal direction (horizontal direction). The first locking portion 63 is composed of a projection and a notch arranged vertically. Of the plurality of second plate-shaped members 42a, 42b, 42c, 42d, the second plate-shaped member 42d, which is located on the outer side in the thickness direction, is provided with a second locking portion 64 at its end. The second locking portion 64 is composed of a projection and a notch arranged vertically. The first locking portion 63 of the first plate-shaped member 41c and the second locking portion 64 of the second plate-shaped member 42d can be locked together horizontally. In this case, the projection of the first locking portion 63 of the first plate-shaped member 41c is located vertically below the projection of the second locking portion 64 of the second plate-shaped member 42d.

[0039] The third support member 45 has a hollow shape. The third support member 45 has a roughly triangular tubular shape. The third support member 45 is made of, for example, carbon steel, stainless steel, or aluminum alloy. The third support member 45 is positioned between the first support member 43 and the second support member 44 in the circumferential direction. The upper end of the third support member 45 is positioned between the end of each first plate-shaped member 41c and the end of each second plate-shaped member 42c. The end of the first plate-shaped member 41c and the upper end of the third support member 45 are connected by a connecting member (for example, a bolt) 61e. The end of the second plate-shaped member 42c and the upper end of the third support member 45 are connected by a connecting member (for example, a bolt) 62e.

[0040] <Bottom layer plate-like component assembly> Figure 7 is a perspective view showing the assembled state of the bottommost first plate-like member and the second plate-like member, and Figure 8 is a perspective view showing the assembly portion of the bottommost first plate-like member and the second plate-like member.

[0041] As shown in Figures 7 and 8, the lowest plate-like member assembly 51B is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d in a grid pattern. That is, the plate-like member assembly 51B is constructed by combining a plurality of second plate-like members 42a, 42b, 42c, 42d, which are also spaced apart in the plate thickness direction, with a plurality of first plate-like members 41a, 41b, 41c, 41d, which are spaced apart in the plate thickness direction, from above in a perpendicular direction. The plate-like member assembly 51B is constructed by combining a plurality of first plate-like members 41a, 41b, 41c, 41d and a plurality of second plate-like members 42a, 42b, 42c, 42d, which are spaced apart in the plate thickness direction, to form a plurality of cells 25 along the vertical direction, which are spaced apart in the horizontal direction.

[0042] The connection structure between the first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d and the first support member 43, the second support member 44, and the third support member 45 in the plate-like member assembly 51B is almost the same as that of the plate-like member assembly 51A, and therefore no explanation is provided. In other words, the only difference between the plate-like member assembly 51B and the plate-like member assembly 51A is that the positions of the first plate-like members 41a, 41b, 41c, 41d and the second plate-like members 42a, 42b, 42c, 42d are reversed vertically, and the connection position between the first support member 43, the second support member 44, and the third support member 45 is at the lower end.

[0043] Furthermore, the plate-shaped member assembly 51B is constructed by combining a plurality of first plate-shaped members 41a, 41b, 41c, 41d located on the lower side with a plurality of second plate-shaped members 42a, 42b, 42c, 42d located on the upper side in an orthogonal direction. Of the plurality of first plate-shaped members 41a, 41b, 41c, 41d, the first plate-shaped member 41c, which is located on the outer side in the thickness direction, is provided with a first locking portion 65 at its end. The first locking portion 65 is composed of a projection and a notch arranged vertically. Of the plurality of second plate-shaped members 42a, 42b, 42c, 42d, the second plate-shaped member 42d, which is located on the outer side in the thickness direction, is provided with a second locking portion 66 at its end. The second locking portion 66 is composed of a projection and a notch arranged vertically. The first locking portion 65 of the first plate-shaped member 41c and the second locking portion 66 of the second plate-shaped member 42d can be locked together horizontally. In this case, the projection of the first locking portion 65 of the first plate-shaped member 41c is positioned vertically above and below the second locking portion 66 of the second plate-shaped member 42d.

[0044] Furthermore, the lowest plate-shaped member assembly 51B is provided with lifting notches 71 at the bottom of the first plate-shaped members 41a, 41b, 41c, and 41d. The lifting notches 71 are provided to connect adjacent cells 25. In addition, the lowest plate-shaped member assembly 51B is provided with lifting notches 72 at the bottom of the second plate-shaped members 42a, 42b, 42c, and 42d. The lifting notches 72 are provided to connect adjacent cells 25. The lifting notches 71 and 72 are also used as drainage notches. Note that the lifting notches 71 and 72 may be provided not only in the lowest plate-shaped members 41 and 42, but also in the uppermost plate-shaped members 41 and 42, and in the intermediate plate-shaped members 41 and 42. Furthermore, the lifting notches 71 and 72 do not need to be provided for all cells 25, but may be provided only at the positions where the hooks 94 of the lifting device 93, described later, are secured.

[0045] <Assembly of plate-like intermediate layer members> As shown in Figure 3, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B are constructed by combining a plurality of first plate-shaped members 41 and a plurality of second plate-shaped members 42 in a grid pattern, with the ends of the first plate-shaped members 41 connected to a first support member 43 and the ends of the second plate-shaped members 42 connected to a second support member 44.

[0046] On the other hand, the multiple plate-shaped member assemblies 51 located in the intermediate layer between the plate-shaped member assembly 51A and the plate-shaped member assembly 51B are stacked on top of and supported by the plate-shaped member assembly 51B located in the lowest layer. The multiple plate-shaped member assemblies 51 in the intermediate layer are supported by contacting the first support member 43, the second support member 44, and the third support member 45 at their outer periphery, but they are not connected. That is, the ends of the multiple first plate-shaped members 41 and the multiple second plate-shaped members 42 are not connected to the first support member 43, the second support member 44, and the third support member 45. However, some of the multiple plate-shaped member assemblies 51 in the intermediate layer may have their ends connected to the first support member 43, the second support member 44, and the third support member 45.

[0047] <How to assemble the basket> Figure 9 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 10 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 11 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 12 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 13 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 14 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, Figure 15 is a perspective view showing the assembled state of the bottom layer in the basket assembly method, and Figure 16 is a perspective view showing the assembled state of the plate-like members in the basket assembly method.

[0048] As shown in Figure 9, first, three first plate-like members 41a and 41b are placed at intervals in the thickness direction. Then, two second plate-like members 42d are placed above the three first plate-like members 41a and 41b, perpendicular to the first plate-like members 41a and 41b, at intervals in the thickness direction. In this case, the three first plate-like members 41a and 41b are located towards the center of the basket 24, and the two second plate-like members 42d are located towards the outer periphery of the basket 24, that is, second from the outer periphery. The two are assembled by fitting the lower notches of the two second plate-like members 42d into the upper notches of the three first plate-like members 41a and 41b.

[0049] As shown in Figure 10, the next step is to attach the two first plate-shaped members 41c to the plate-shaped assembly, which consists of three first plate-shaped members 41a, 41b and two second plate-shaped members 42d. Specifically, by horizontally moving the first plate-shaped members 41c from both sides of the first plate-shaped members 41a, 41b, the ends of the first plate-shaped members 41c are attached to the ends of the second plate-shaped members 42d, as shown in Figure 11. The first plate-shaped member 41c is provided with a first locking portion 65 at its end, and the second plate-shaped member 42d is provided with a second locking portion 66 at its end. Therefore, by bringing the first plate-shaped member 41c closer to the second plate-shaped member 42d in the horizontal direction, the first locking portion 65 of the first plate-shaped member 41c is locked to the second locking portion 66 of the second plate-shaped member 42d. As a result, the first plate-like member 41c and the second plate-like member 42d are constrained from moving vertically relative to each other.

[0050] As shown in Figure 12, two first plate-shaped members 41d are attached to a plate-shaped assembly made up of five first plate-shaped members 41a, 41b, 41c and two second plate-shaped members 42d. First, the first plate-shaped members 41d are placed on both sides of the first plate-shaped member 41c with a gap between them. Then, as shown in Figure 13, the second plate-shaped member 42a is lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, 41d. In other words, the two are attached by fitting the lower notch of one second plate-shaped member 42a into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, 41d.

[0051] As shown in Figure 14, two second plate-shaped members 42b are attached to a plate-shaped assembly which consists of five first plate-shaped members 41a, 41b, 41c, and 41d and three second plate-shaped members 42a and 42d. The two second plate-shaped members 42b are lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, and 41d. In other words, the two second plate-shaped members 42b are attached by fitting the lower notches of the two first plate-shaped members 42b into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, and 41d.

[0052] Next, as shown in Figure 15, two second plate-shaped members 42c are attached to a plate-shaped assembly which consists of seven first plate-shaped members 41a, 41b, 41c, 41d and five second plate-shaped members 42a, 42b, 42d. The two second plate-shaped members 42c are lowered from above and attached to the seven first plate-shaped members 41a, 41b, 41c, 41d. In other words, the two second plate-shaped members 42c are attached by fitting the lower notches of the two first plate-shaped members 42c into the upper notches of the seven first plate-shaped members 41a, 41b, 41c, 41d.

[0053] The bottom layer plate member assembly 51B is formed by assembling seven first plate members 41a, 41b, 41c, 41d and seven second plate members 42a, 42b, 42c, 42d. Next, once the bottom layer plate member assembly 51B is formed, the intermediate layer plate member assembly 51 is formed in multiple stages by assembling the first plate members 41a, 41b, 41c, 41d and the second plate members 42a, 42b, 42c, 42d to the plate member assembly 51B. Finally, the top layer plate member assembly 51A is formed by assembling the second plate members 42a, 42b, 42c, 42d and the first plate members 41a, 41b, 41c, 41d at the top, as shown in Figure 16. When assembling the uppermost plate-shaped member assembly 51A, multiple first plate-shaped members 41c and multiple second plate-shaped members 42d are assembled in a grid pattern, similar to the lowermost plate-shaped member assembly 51B. At this time, the first locking portion 63 of the first plate-shaped member 41c is locked to the second locking portion 64 of the second plate-shaped member 42d, thereby restricting the relative vertical movement between the first plate-shaped member 41c and the second plate-shaped member 42d. The basket body 52 is then constructed from the uppermost plate-shaped member assembly 51A, multiple intermediate plate-shaped member assemblies 51, and the lowermost plate-shaped member assembly 51B.

[0054] Figure 17 is a perspective view showing the assembled state of the support members in the basket assembly method, Figure 18 is a perspective view showing the assembled state of the support members in the basket assembly method, and Figure 19 is a perspective view showing the assembled state of the support members in the basket assembly method.

[0055] As shown in Figure 17, once the basket body 52 is assembled, the support members 43, 44, and 45 are attached to the basket body 52. ​​First, the first support members 43a and 43b are placed on the longitudinal ends of the multiple first plate-like members 41a and 41b. Then, the ends of the multiple first plate-like members 41a and 41b are fastened to the ends of the first support members 43a and 43b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. Additionally, the middle portion of the second plate-like member 42d is fastened to the ends of the first support members 43a and 43b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0056] As shown in Figure 18, next, second support members 44a and 44b are placed on the longitudinal ends of the multiple second plate-like members 42a and 42b. Then, the ends of the multiple second plate-like members 42a and 42b are fastened to the ends of the second support members 44a and 44b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. In addition, the middle portion of the first plate-like member 41d is fastened to the ends of the second support members 44a and 44b using the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0057] As shown in Figure 19, finally, a third support member 45 is placed between the first support members 43a, 43b and the second support members 44a, 44b. Then, the ends of the first plate-shaped member 41c, the end of the third support member 45, and the end of the second plate-shaped member 42c are fastened together at the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B.

[0058] In addition, while the basket 24 connects the first plate-like member 41 and the second plate-like member 42 to the respective support members 43, 44, and 45 at the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B, the first plate-like member 41 and the second plate-like member 42 to the respective support members 43, 44, and 45 may also be connected at a part of the intermediate plate-like member assembly 51 between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B.

[0059] In this assembled basket 24, the ends of the first plate-like members 41a, 41b and the ends of the first support members 43a, 43b are connected at least between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. In addition, the ends of the second plate-like members 42a, 42b and the ends of the second support members 44a, 44b are connected between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B. As a result, the basket 24 is firmly assembled between the uppermost plate-like member assembly 51A and the lowermost plate-like member assembly 51B, so that the first plate-like members 41a, 41b, 41c, 41d, the second plate-like members 42a, 42b, 42c, 42d, the first support members 43a, 43b, and the second support members 44a, 44b do not fall off.

[0060] Then, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B connect the ends of the second plate-shaped member 42d to the ends of the first support members 43a and 43b, and the first plate-shaped member 41d to the ends of the second support members 44a and 44b. In addition, the uppermost plate-shaped member assembly 51A and the lowermost plate-shaped member assembly 51B connect the end of the first plate-shaped member 41c to the end of the third support member 45 and the end of the second plate-shaped member 42c. As a result, the support of the first plate-shaped members 41a, 41b, 41c, and 41d and the second plate-shaped members 42a, 42b, 42c, and 42d is strengthened.

[0061] <Basket conveying device> Figure 20 is a plan view showing the basket conveying device.

[0062] As shown in Figure 20, the basket conveying device (hereinafter simply referred to as the conveying device) 100 lifts and conveys the basket 24 and brings it into the body 12 (cask 11). The conveying device 100 comprises a lifting frame 101 and a plurality of lifting units (four in this embodiment) 102.

[0063] The suspension frame 101 is constructed by connecting two suspension beams 111 so as to intersect horizontally. Multiple suspension units 102 are provided so as to hang downward from the suspension frame 101. The multiple suspension units 102 are positioned opposite each other above each cell 25. Note that the number of suspension units 102 is not limited to four. There may be three or five or more suspension units 102.

[0064] <Hanging Unit> The suspension unit 102 will be described in detail below, but the four suspension units 102 have almost the same configuration, and the suspension unit 102 located between the first plate-shaped members 41b and 41c will be described. Figure 21 is a front view of the suspension unit, Figure 22 is a side view showing the main part of the suspension unit, and Figure 23 is a front view showing the operating state of the suspension unit.

[0065] As shown in Figures 21 and 22, the suspension unit 102 includes a suspension rod 121 and a locking portion 122.

[0066] The suspension frame 101 is connected to the lower part of the suspension beam 111 via a connecting member 112 to the upper end of the suspension rod 121. The suspension rod 121 is cylindrical in shape and is arranged vertically. The outer diameter of the suspension rod 121 is smaller than the dimensions of the cell 25, and longer than the total length of the cell 25 (basket 24). Therefore, the suspension rod 121 can be inserted into and removed from the cell 25 from above.

[0067] The suspension rod 121 has a locking portion 122 attached to its lower part. The locking portion 122 may also be integrally provided on the lower part of the suspension rod 121. The locking portion 122 can engage with and disengage from the plate-shaped members 41 and 42, which are constituent members of the cell 25. The basket 24 is constructed by stacking multiple plate-shaped member assemblies 51, each made up of multiple plate-shaped members 41 and 42 assembled in a grid pattern, in multiple layers in the vertical direction. The locking portion 122 can engage with and disengage from the lower ends of the plate-shaped members 41 and 42. Specifically, the locking portion 122 can engage with and disengage from the first plate-shaped member 41 or the second plate-shaped member 42 that constitutes the plate-shaped member assembly 51 located in the lowest layer. The first plate-shaped member 41 and the second plate-shaped member 42 are provided with lifting notches 71 and 72 at their lower ends, and the locking portion 122 can engage with and disengage from the lifting notches 71 (72).

[0068] In this embodiment, the locking portion 122 has a pair of hooks 131, 132 that can engage with and disengage from a pair of horizontally opposing first plate-shaped members 41b, 41c. The suspension rod 121 has a rectangular mounting flange portion 141 fixed to its lower end. The mounting flange portion 141 is horizontal, and support plates 142, 143 and support plates 144, 145 are fixed to its lower surface along the vertical direction. Hook 131 is positioned vertically between support plates 142, 143 and is rotatably supported by a support shaft 146 along the horizontal direction. Hook 132 is positioned vertically between support plates 144, 145 and is rotatably supported by a support shaft 147 along the horizontal direction. Hook 131 has an S-shape, with a locking piece 131a at the bottom and a bent portion 131b at the top. The hook 132 has a Z-shape, with a locking piece 132a at the bottom and a bent portion 132b at the top.

[0069] Therefore, the pair of hooks 131 and 132 constituting the locking portion 122 move to a release position relative to the first plate-like members 41b and 41c, which is the position where the locking pieces 131a and 132a approach each other due to their own weight, that is, the weight of the bent portions 131b and 132b, and are held in the release position.

[0070] A moving member 151 is provided to move the pair of hooks 131 and 132 to a locking position that engages with a pair of first plate-shaped members 41b and 41c. The suspension rod 121 has a pair of operating rods 152 on both sides in the horizontal direction, aligned vertically. The pair of operating rods 152 are supported on the outer circumference of the suspension rod 121 by guide members (not shown) so as to be movable along the vertical direction. An operating part 153 is connected to the upper end of the operating rod 152, and the moving member 151 is connected to the lower end. The operating part 153 can be operated by an operator directly or remotely. The operating member allows the operating rod 152 to be moved along the vertical direction, and the operating part 153 can be held at the upper and lower end positions. The moving member 151 is positioned between the hooks 131 and 132 and is movable along the vertical direction together with the operating rod 152.

[0071] Therefore, as shown in Figure 22, the pair of hooks 131 and 132 are held in a released position where the locking pieces 131a and 132a are separated from the first plate-like members 41b and 41c by the weight of the bent portions 131b and 132b. From this state, the operating rod 152 is lowered by the operating unit 153, and the movable member 151 provided at the lower end of the operating rod 152 is lowered. Then, as shown in Figure 23, the movable member 151 presses against the back surfaces of the hooks 131 and 132, causing the hook 131 to rotate clockwise around the support shaft 146 and the hook 132 to rotate counterclockwise around the support shaft 147. The hooks 131 and 132 then move to a locked position where the locking pieces 131a and 132a engage with the lifting notches 71 of the first plate-like members 41b and 41c, and are held in the locked position.

[0072] Alternatively, the pair of hooks 131 and 132 may be configured to be held in a locked position by their own weight, with the locking pieces 131a and 132a engaging with the first plate-like members 41b and 41c, and then moved to a release position relative to the first plate-like members 41b and 41c by the upward movement of the movable member 151.

[0073] Figures 24 and 25 are schematic diagrams illustrating the method of transporting the basket.

[0074] Once the basket 24 is assembled, it is transported by the conveying device 100 and brought into the cask 11. As shown in Figures 20 and 24, the conveying device 100 supports the basket 24. The basket 24 is placed in a predetermined position. The crane 150 supports four lifting units 102 via the lifting platform 101. The crane 150 is moved to position the four lifting units 102 above the basket 24 via the lifting platform 101. At this time, the crane 150 is operated so that the four lifting units 102 are positioned above each cell 25 of the basket 24.

[0075] Next, the crane 150 lowers the four lifting units 102 via the lifting frame 101. The lifting rods 121 and locking parts 122 are then inserted into the cells 25 of the basket 24, and as shown in Figure 21, each locking part 122 reaches the lower end of the basket 24, at which point the crane 150 stops lowering the lifting units 102. The locking parts 122 are then activated and move from the released position to the locked position. As shown in Figure 23, the locking parts 122 then lock onto the plate-shaped members 41 of the basket 24.

[0076] The locking portion 122 can stably support the basket 24 by locking into the lifting notches 71, 72 (see Figure 7) formed in the first plate-shaped member 41 or the second plate-shaped member 42 that constitute the lowest plate-shaped member assembly 51B of the basket 24. The locking portion 122 may also support the upper end or middle portion of the basket 24.

[0077] Next, once the locking part 122 locks the basket 24, the crane 150 raises the four lifting units 102 via the lifting frame 101. Then, the lifting rod 121 and the locking part 122 can lift the basket 24. As shown in Figure 25, the crane 150 is then operated to transport the basket 24 and position it above the body 12.

[0078] The cask 11 is placed on the floor 81 with only the body 12 remaining, with the lid 13 removed. Therefore, the basket 24 is lowered by the crane 150 and brought into the interior of the body 12. The cask 11 is assembled when the basket 24 is placed in the cavity 23 of the body 12.

[0079] [Effects of this embodiment] The basket transport device according to the first embodiment comprises a suspension frame 101, a plurality of suspension rods 121 suspended from the suspension frame 101 and detachably inserted into and removed from the cell (storage section) 25, and locking portions 122 provided at the lower ends of the plurality of suspension rods 121 and detachably engaged with the constituent members of the cell 25.

[0080] According to the basket conveying device of the first embodiment, after inserting the locking portion 122, which is attached to the lower end of the suspension rod 121 and is in the released position, into the cell 25, the locking portion 122 is moved to the locked position and locked to the cell's components, and the basket 24 can be lifted by raising the locking portion 122 via the suspension rod 121. As a result, the basket 24 can be conveyed appropriately.

[0081] The basket conveying device according to the second embodiment is the basket conveying device according to the first embodiment, and furthermore, the locking portion 122 is detachably attached to the lower end of the suspension rod 121. This allows the locking portion 122 to be easily replaced.

[0082] The basket conveying device according to the third embodiment is a basket conveying device according to the first or second embodiment, wherein the basket 24 is constructed by stacking multiple plate-shaped member assemblies 51, each made up of multiple plate-shaped members 41 and 42 assembled in a grid pattern, in multiple layers in the vertical direction, and the locking portion 122 is detachable from the lower ends of the plate-shaped members 41 and 42. As a result, the locking portion 122 supports the lower end of the basket 24 during transport, and the basket 24 can be easily lifted.

[0083] The basket conveying device according to the fourth embodiment is the basket conveying device according to the third embodiment, further comprising a locking portion 122 that can engage with and disengage from plate-shaped members 41 and 42 constituting the plate-shaped member assembly 51B located at the lowest layer. This allows the basket 24 to be safely lifted.

[0084] The basket conveying device according to the fifth embodiment is a basket conveying device according to the third or fourth embodiment, wherein the plate-shaped members 41 and 42 constituting the plate-shaped member assembly 51B are provided with lifting notches 71 and 72, and the locking portion 122 is detachable from the lifting notches 71 and 72. This allows the basket 24 to be conveyed stably.

[0085] The basket conveying device according to the sixth embodiment is a basket conveying device according to any one of the third to fifth embodiments, further comprising a locking portion 122 having a pair of hooks 131, 132 that can engage with and detach from a pair of horizontally opposing plate-shaped members 41, 42. By engaging the pair of hooks 131, 132 with the plate-shaped members 41, 42, the basket 24 can be stably supported.

[0086] The basket conveying device according to the seventh embodiment is a basket conveying device according to the sixth embodiment, wherein the pair of hooks 131 and 132 can move by their own weight to either a release position relative to the plate-shaped members 41 and 42 or a locking position where they are locked to the plate-shaped members 41 and 42. This simplifies the structure.

[0087] The basket conveying device according to the eighth embodiment is a basket conveying device according to the seventh embodiment, further comprising a moving member 151 that moves a pair of hooks 131, 132 to either a release position relative to the plate-shaped members 41, 42 or a locking position that locks them to the plate-shaped members 41, 42. As a result, the moving member 151 moves and holds the hooks 131, 132 to the locking position, thereby stably supporting the basket 24.

[0088] The basket conveying device according to the ninth embodiment is a basket conveying device according to the seventh or eighth embodiment, further comprising an operating rod 152 arranged along a suspension rod 121, the operating rod 152 having an operating part 153 at its upper end that moves the operating rod 152 vertically, and a moving member 151 connected to its lower end. As a result, the hooks 131 and 132 can be appropriately moved to the release position and the locking position by moving the lifting rod 121 with the operating part 153, thereby moving the moving member 151.

[0089] A basket transport method according to the tenth embodiment includes the steps of: lowering the suspension rod 121 and inserting the locking portion 122 provided at the lower end of the suspension rod 121 into the cell (storage section); stopping the locking portion 122 at a predetermined position and moving the locking portion 122 from the release position to a locking position that locks it to a component of the cell 25; and raising the suspension rod 121 to raise the locking portion 122 that is locked to the component, thereby lifting the basket 24.

[0090] According to the basket transport method of the tenth embodiment, the basket 24 can be transported appropriately.

[0091] The basket transport method according to the 11th embodiment is the basket transport method according to the 10th embodiment, further comprising a basket 24 constructed by stacking multiple plate-shaped member assemblies 51, each made up of multiple plate-shaped members 41 and 42 assembled in a grid pattern, in multiple layers in the vertical direction, and the locking portion 122 locks to the plate-shaped members 41 and 42 constituting the plate-shaped member assembly 51 located at the lowest layer at the locking position. As a result, when lifting the basket 24, the locking portion 122 only needs to be locked to the lowest layer's first plate-shaped member 41 or second plate-shaped member 42, and the basket 24 can be easily lifted.

[0092] The basket transport method according to the 12th embodiment is a basket transport method according to the 10th or 11th embodiment, further comprising: the plate-shaped members 41 and 42 located at the lowest layer having lifting notches 71 and 72 at their lower ends, and the locking portion 122 locking to the lifting notches 71 and 72 of the plate-shaped members 41 and 42 located at the lowest layer at the locking position, thereby enabling stable transport of the basket 24. [Explanation of Symbols]

[0093] 11. Cask (container for radioactive material) 12 Torso 13 Lid 21 Container body 22 Opening 23 Cavity 24 Basketball 25 cells (storage compartment) 26 Outer cylinder 27 Heat transfer fins 28 Resin 29 Bottom 30 Trunnion 31 Primary lid 32 Secondary lid 33 Tertiary lid 41, 41a, 41b, 41c, 41d First plate-shaped member (constituent member) 42, 42a, 42b, 42c, 42d Second plate-like member (constituent member) 43, 43a, 43b First support member 44, 44a, 44b Second support member 45 Third support member 51, 51A, 51B Plate-shaped member assembly 52 Basket body 61a, 61b, 61c, 61d, 61e Connecting members 62a, 62b, 62c, 62d, 62e Connecting members 63, 65 First locking part 64, 66 Second locking part 71, 72 Lifting notches 100 Basket conveying device 101 Hanging frame 102 Lifting Unit 111 Suspension beam 121 Suspension Rod 122 Locking part 131,132 hooks 141 Mounting flange section 142,143,144,145 Support plate 146,147 Support shaft 151 Movable member 152 Operating Rod 153 Operation section

Claims

1. In a basket transport device that transports a basket in which multiple storage compartments for storing radioactive materials are partitioned, Suspension frame and, Multiple suspension rods suspended from the aforementioned suspension frame and detachably inserted into and removed from the aforementioned storage section, A locking portion is provided at the lower end of the plurality of suspension rods and is capable of engaging with and disengaging from the components of the storage unit, A basket conveying device equipped with [a specific feature].

2. The locking portion is detachably attached to the lower end of the plurality of suspension rods. The basket conveying device according to claim 1.

3. The basket is constructed by stacking multiple plate-like member assemblies, each made up of multiple plate-like members assembled in a grid pattern, in a vertical direction. The locking portion is detachable from the lower end of the plate-shaped member. The basket conveying device according to claim 1.

4. The locking portion is capable of engaging with and disengaging from the plate-shaped member constituting the plate-shaped member assembly located at the lowest layer. The basket conveying device according to claim 3.

5. The plate-shaped members constituting the plate-shaped member assembly are provided with lifting notches, and the locking portions are detachable from the lifting notches. The basket conveying device according to claim 4.

6. The locking portion has a pair of hooks that can engage with and disengage from a pair of horizontally opposing plate-shaped members. A basket conveying device according to claim 4 or claim 5.

7. The pair of hooks are movable by their own weight to either a release position relative to the plate-shaped member or a locking position where they are locked to the plate-shaped member. The basket conveying device according to claim 6.

8. The pair of hooks has a movable member that moves them to either a release position relative to the plate-shaped member or a locking position that locks them to the plate-shaped member, The basket conveying device according to claim 7.

9. An operating rod is arranged along the suspension rod, and the operating rod has an operating part at its upper end that moves the operating rod vertically, and the moving member is connected to its lower end. The basket conveying device according to claim 8.

10. In a method for transporting a basket in which multiple compartments for storing radioactive materials are partitioned, The steps include lowering the suspension rod and inserting the locking portion provided at the lower end of the suspension rod into the storage portion, The steps include stopping the locking portion at a predetermined position and moving the locking portion from the release position to a locking position that engages with the component of the storage portion, The steps include raising the suspension rod to raise the locking portion that is engaged with the component, thereby lifting the basket, A method for transporting a basket having [a certain feature].

11. The basket is constructed by stacking multiple plate-like member assemblies, each made up of multiple plate-like members assembled in a grid pattern, in a vertical direction. The locking portion locks to the plate-shaped member constituting the plate-shaped member assembly located at the lowest layer in the locking position. The method for transporting a basket according to claim 10.

12. The plate-shaped member located at the lowest layer is provided with a lifting notch at its lower end. The locking portion engages with the lifting notch of the plate-shaped member located at the lowest layer in the locking position. The method for transporting a basket according to claim 11.

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