Tank

Abstract

To provide a tank, which is configured so that support mechanisms can support a liner to suppress heat from transferring from the liner to a peripheral wall.SOLUTION: A tank (10) is provided with: a peripheral wall (11) directed in a vertical direction to form a storage space (S) for liquid (L); a heat insulation layer (17) provided on the inner surface side of the peripheral wall; a liner (18) coating the inner surface side of the heat insulation layer; and a plurality of support mechanisms (30) that supports the liner with respect to the peripheral wall. The support mechanism comprises: a peripheral wall-side support member (31) fixed to the inner surface side of the peripheral wall; a connection member (33) fixed to the outer surface side of the liner and extended across the peripheral wall-side support member, in non contact with the peripheral wall-side support member; and a support heat insulation material (35) which connects the peripheral wall-side support member to the connection member and transmits inward force applied to the liner, from the connection member to the peripheral wall-side support member.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a tank for storing a liquid.

Background Art

[0002] In various facilities and sites, large tanks for storing liquids are used. For example, Patent Document 1 discloses a tank in which an inner tank and an outer tank are arranged inside a cylindrical peripheral wall. Patent Document 1 attaches a liner plate and a heat insulating material constituting the outer tank in advance to a standard segment constituting the cylindrical peripheral wall, and constructs the cylindrical peripheral wall and the outer tank by joining and laminating various segments including the standard segment.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the tank of Patent Document 1, an inner tank is arranged inside the outer tank, and the inner tank is difficult to stand alone and requires a support structure separate from the inner tank. On the other hand, when the cylindrical peripheral wall is made of, for example, a structural steel plate, it is necessary to suppress heat transfer between the inner tank and the cylindrical peripheral wall so that the temperature is below the required temperature in order to ensure strength. From the above, there has been a demand for a support structure that can support the inner tank and suppress heat transmitted from the stored liquid to the cylindrical peripheral wall through the inner tank and the support mechanism.

[0005] In view of this point, the present invention is made, and one of the objects is to provide a tank that can support a liner by a support mechanism and suppress heat transfer from the liner to the peripheral wall.

Means for Solving the Problems

[0006] A tank according to one aspect of the present invention includes a peripheral wall that is oriented vertically to form a liquid storage space, a heat insulation layer provided on the inner surface side of the peripheral wall, a liner that covers the inner surface side of the heat insulation layer, and a plurality of support mechanisms that support the liner with respect to the peripheral wall. The support mechanism includes a peripheral wall side support member fixed to the inner surface side of the peripheral wall, a connecting member fixed to the outer surface side of the liner and extending so as to straddle the peripheral wall side support member while being non-contact with the peripheral wall side support member, and a support heat insulating material that connects the peripheral wall side support member and the connecting member and transmits an inward force applied to the liner from the connecting member to the peripheral wall side support member.

Effects of the Invention

[0007] According to the present invention, the support mechanism can insulate between the peripheral wall side support member and the connecting member by the support heat insulating material, and thus suppress heat transfer from the liner to the peripheral wall. Moreover, the support mechanism can transmit and support the inward force applied to the liner via the support heat insulating material to the peripheral wall, and can maintain the state in which the liner is supported along the peripheral wall.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] Hereinafter, a tank according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, the present invention is not limited to the following embodiments, and can be appropriately modified and implemented within the scope of not changing the gist thereof. In the following drawings, for convenience of explanation, some configurations may be omitted. Further, in this specification and the claims, unless otherwise specified, "inside", "inner side", "inward", and "inward direction" are directions toward the storage space side of the tank, and "outside", "outer side", "outward", and "outward direction" are the opposite sides.

[0010] FIG. 1 is a longitudinal sectional view of a part of a tank according to an embodiment. In FIG. 1, an example of a tank 10 having a structure generally used in various facilities is shown. The tank 10 includes a cylindrical peripheral wall 11 oriented in the vertical direction and a bottom wall 12 provided at the lower part of the peripheral wall 11, and a storage space S for storing various liquids L is formed inside. The peripheral wall 11 and the bottom wall 12 are made of structural steel plates, and examples of the structural steel plates include general carbon steel (for example, SM490A) with little strength reduction.

[0011] In the tank 10, a roof 13 is provided so as to cover the upper part of the peripheral wall 11. In FIG. 1, it is formed in a dome shape, but various modifications are possible, such as forming it in a hammer shape or in a flat shape with a water gradient. Further, the tank 10 is supported on a foundation slab 15 provided on the ground surface.

[0012] The tank 10 further includes a heat insulation layer 17 provided on the inner surface side of the peripheral wall 11 and the bottom wall 12, and a liner 18 that covers the inner surface side of the heat insulation layer 17. The liner 18 is configured by arranging plate members 18a having a square planar shape in two orthogonal directions.

[0013] Here, hereinafter, the functions of the heat insulation layer 17 and the liner 18 will be described by taking as an example the case where the stored liquid L is a molten salt serving as a heat storage material. Such a molten salt can be exemplified by a mixed salt of NaNO3 and KNO3 that is stored and used in a temperature range of about 300 to 600°C as a chemically inert nitrate-based molten salt.

[0014] The heat insulation layer 17 has a heat insulation function and a support function of transmitting the internal pressure caused by the liquid L stored in the storage space S to the peripheral wall 11 and the bottom wall 12.

[0015] The heat insulation function is to keep the surface temperatures of the peripheral wall 11, the bottom wall 12, and the foundation slab 15 that supports the bottom wall 12 at a constant temperature and to keep the liquid L warm. By keeping the surface temperatures of the peripheral wall 11, the bottom wall 12, and the foundation slab 15 at a constant temperature, a decrease in their strength is suppressed. Thereby, the required plate thickness of the structural steel plates of the peripheral wall 11 and the bottom wall 12 can be rationalized.

[0016] The support function is a function of transmitting the internal pressure caused by the liquid L to the peripheral wall 11 and the bottom wall 12 through the liner 18 and the heat insulation layer 17. If the peripheral wall 11 and the bottom wall 12 are in close contact through the liner 18 and the heat insulation layer 17, the internal pressure can be transmitted as a surface external force. The heat insulation layer 17 is made of a material that has sufficient compressive strength against the internal pressure and has a sufficiently large rigidity so that the liner 18 is not damaged by deformation.

[0017] The shape of the heat insulation layer 17 is a vertically long strip shape with a rounded shape of the cylindrical peripheral wall 11, and by being allocated, cracking due to internal pressure is prevented. The heat insulation layer 17 is supported by the peripheral wall 11 or the bottom wall 12, and the support portion is preferably made as large as possible in a plate shape to reduce the number of heat paths.

[0018] By using, for example, a calcium silicate-based heat insulation board (heat insulating material) for the heat insulation layer 17, the above heat insulation function and support function can be achieved simultaneously even at high temperatures.

[0019] The functions of the liner 18 are to withstand corrosion by the liquid L that becomes a molten salt and to exhibit the liquid tightness of the liquid L. The liner 18 is a layer made of a highly corrosion-resistant steel material (for example, stainless steel such as SUS316).

[0020] In order to withstand the corrosion of the liquid L, the plate thickness of the liner 18 shall be such that it can withstand the corrosion during the service period. In order to ensure the liquid tightness of the liquid L, the liner 18 shall be a closed layer without leakage.

[0021] As described above, the heat insulating layer 17 exhibits the supporting function and the heat insulating function. However, there is a problem of enhancing the supporting function of the liner 18 so that the liner 18 oriented in the vertical direction along the peripheral wall 11 can be stably supported for a longer period. Further, while enhancing the supporting function, there is also a problem of enabling the heat insulating layer 17 to exhibit a heat insulating function of suppressing heat transfer from the liner 18 to the peripheral wall 11 for reasons such as ensuring the strength by setting the temperature of the peripheral wall 11 to a predetermined temperature or lower. In order to simultaneously exhibit these two functions, the tank 10 of the present embodiment includes a plurality of support mechanisms 30 for supporting the liner 18 with respect to the peripheral wall 11. Hereinafter, the configuration of the support mechanism 30 will be described.

[0022] FIG. 2 is a longitudinal sectional view of the support mechanism of the present embodiment and its periphery. As shown in FIGS. 1 and 2, the support mechanism 30 is provided at a portion where the ends of the plate members 18a adjacent to each other by the liner 18 overlap and are joined.

[0023] The support mechanism 30 is provided so as to be embedded in the heat insulating layer 17 between the inner surface of the peripheral wall 11 and the outer surface of the liner 18. In other words, the support mechanism 30 connects the inner surface of the peripheral wall 11 and the outer surface of the liner 18. The support mechanism 30 includes a peripheral wall side support member 31, a liner side support member 32, a connecting member 33, a support heat insulating material 35, an intermediate heat insulating material 36, and a clamping portion 38.

[0024] In this embodiment, the peripheral wall side support member 31 is formed of a channel steel and is formed in a U-shaped (channel-shaped) with an open top. The peripheral wall side support member 31 includes a first forming portion 41 that is disposed at a predetermined distance outward from the liner 18 and is substantially parallel to the liner 18. Further, the peripheral wall side support member 31 includes a second forming portion 42 that extends in the inner and outer direction between the lower end of the first forming portion 41 and the inner surface of the peripheral wall 11, and a third forming portion 43 that extends along the inner surface of the peripheral wall 11 with the outer end of the second forming portion 42 as the lower end. The heat insulating material of the heat insulating layer 17 is also disposed in the space surrounded by each of the forming portions 41 to 43.

[0025] Each of the forming portions 41 to 43 is formed in a plate shape. The first forming portion 41 and the third forming portion 43 extend in the vertical direction, and the second forming portion 42 extends in the inner and outer direction (horizontal direction). An opening 44 through which the connecting member 33 penetrates is formed in the middle portion in the vertical direction of the first forming portion 41. The opening 44 is formed in a shape and an opening area such that it is non-contact with the penetrating connecting member 33. The third forming portion 43 is connected to the inner surface of the peripheral wall 11 by welding or the like, whereby the peripheral wall side support member 31 is fixed to the inner surface side of the peripheral wall 11.

[0026] The liner side support member 32 is fixed to the outer surface side of the liner 18 by welding or the like. The liner side support member 32 includes a contact plate portion (contact portion) 46 that extends along the outer surface of the liner 18, an upper plate portion 47 provided on the upper end side of the contact plate portion 46, and a lower plate portion 48 provided on the lower end side of the contact plate portion 46. The contact plate portion 46 is provided so as to be in surface contact with the outer surface of the liner 18. Further, the liner side support member 32 includes a pair of side plate portions 49 provided at both horizontal ends (both upper and lower ends in FIG. 3) of the contact plate portion 46. For example, a structural steel plate is used for the contact plate portion 46, the upper plate portion 47, the lower plate portion 48, and the pair of side plate portions 49 that constitute the liner side support member 32.

[0027] The upper plate portion 47, the lower plate portion 48, and the pair of side plate portions 49 are joined to the contact plate portion 46 by welding or the like. The upper plate portion 47 and the lower plate portion 48 extend in a horizontal direction that intersects the vertical direction from the upper and lower ends of the contact plate portion 46, and both surfaces in the thickness direction are oriented substantially horizontally. The pair of side plate portions 49 are joined to the upper plate portion 47 and the lower plate portion 48 as well as to the contact plate portion 46 by welding or the like. The pair of side plate portions 49 extend in the horizontal direction from the horizontal ends of the contact plate portion 46, and both surfaces in the thickness direction are oriented substantially vertically.

[0028] The liner-side support member 32 is formed in a box shape that includes the contact plate portion 46, the upper plate portion 47, the lower plate portion 48, and the pair of side plate portions 49 and opens to the outside on the side opposite to the liner 18. An intermediate heat insulating material 36 is provided in the space surrounded by the liner-side support member 32.

[0029] In this embodiment, the connecting member 33 is constituted by a shaft member having a male thread formed on its outer peripheral surface. The inner end, which is one end of the connecting member 33, is fixed to the outer surface (the outer surface side of the liner 18) of the contact plate portion 46 in the liner-side support member 32 by welding or the like. The connecting member 33 extends in the horizontal direction that is the inner-outer direction, and is arranged to penetrate without contacting the opening 44 formed in the first forming portion 41 of the peripheral wall-side support member 31. Therefore, the connecting member 33 extends so as to straddle the first forming portion 41 of the peripheral wall-side support member 31 in the inner-outer direction.

[0030] Further, the connecting member 33 penetrates in the inner-outer direction with respect to the support heat insulating material 35 and the intermediate heat insulating material 36 arranged on both sides of the first forming portion 41.

[0031] The support heat insulating material 35 is arranged along the surface on the side opposite to the liner 18 with respect to the first forming portion 41 of the peripheral wall-side support member 31. In other words, it is provided in a state of contacting the outer surface of the first forming portion 41. The support heat insulating material 35 is provided so as to connect the first forming portion 41 and the connecting member 33 via the clamping portion 38. The intermediate heat insulating material 36 is arranged to be sandwiched between the outer surface of the contact plate portion 46 in the liner-side support member 32 and the inner surface of the first forming portion 41 in the peripheral wall-side support member 31.

[0032] Here, the support heat insulating material 35 and the intermediate heat insulating material 36 are heat insulating materials that exhibit excellent heat insulating properties exceeding static air while enhancing strength and rigidity compared to the heat insulating material used for the heat insulating layer 17. For example, it is a heat insulating material containing heat resistant reinforcing fibers and a scattering material in silica having a nanopore structure.

[0033] The clamping portion 38 is provided at the other end (outer end) of the connecting member 33. The clamping portion 38 includes the above-described connecting member 33 that serves as a male screw member, a nut member 51 that is screwed onto the connecting member 33, and a pressing member 52 that is disposed adjacent to the inner side of the nut member 51 and through which the connecting member 33 passes.

[0034] In the clamping portion 38, by rotating the nut member 51, the nut member 51 and the pressing member 52 can be displaced in the inner and outer direction that is the extending direction of the connecting member 33, and a force can be applied inward. Therefore, by displacing the nut member 51 inward, a clamping force can be applied in the inner and outer direction to the pressing member 52, the support heat insulating material 35, the first forming portion 41, the intermediate heat insulating material 36, and the contact plate portion 46 arranged from the outer side to the inner side. By the action of such a force, a clamping force is applied to the support heat insulating material 35 by the pressing member 52 and the first forming portion 41 of the clamping portion 38. Furthermore, a clamping force is applied to the intermediate heat insulating material 36 by the contact plate portion 46 and the first forming portion 41 of the liner side support member 32.

[0035] Next, the support functions of the liner 18 in the horizontal and vertical directions by the support mechanism 30 will be described. FIG. 4 is an explanatory diagram of the support function in the support mechanism of the embodiment. In the horizontal support function, as shown in FIG. 4, when an inward inertial force F11 of the liner 18 acts on the support mechanism 30, such an inertial force F11 is transmitted as a stress by the support mechanism 30, and a reaction force F12 is obtained from the peripheral wall 11 to which the support mechanism 30 is fixed. At this time, in the support mechanism 30, the stress is transmitted in the configuration surrounded by the broken line in FIG. 4.

[0036] Specifically, stress is transmitted in the following order from the liner 18 to the contact plate portion 46 of the liner-side support member 32, the connecting member 33, the pressing member 52 of the clamping portion 38, the support heat insulating material 35, the first forming portion 41, the second forming portion 42, and the third forming portion 43 of the peripheral wall-side support member 31. By such stress transmission, the support heat insulating material 35 transmits the inward force applied to the liner 18 from the connecting member 33 to the peripheral wall-side support member 31. Then, a reaction force F12 from the peripheral wall 11 can be obtained at the third forming portion 43 of the peripheral wall-side support member 31, and the horizontal support function by the support mechanism 30 is exerted.

[0037] In the vertical support function, when a downward force F21 due to the self-weight of the liner 18 acts on the support mechanism 30, such force F21 is transmitted through the lower plate portion 48 of the liner-side support member 32 to the heat insulating layer 17 in contact with the lower surface of the lower plate portion 48. At the lower plate portion 48, a reaction force F22 against the force F21 is obtained from the heat insulating layer 17, and the vertical support function by the support mechanism 30 is exerted. Here, the lower plate portion 48 functions as a self-weight transmission portion that transmits the force F21 due to the self-weight of the liner 18 to the heat insulating layer 17.

[0038] Subsequently, the heat insulating function of the liner 18 by the support mechanism 30 will be described. FIG. 5 is an explanatory diagram of the heat insulating function in the support mechanism of the embodiment. The support mechanism 30 has a first heat transfer path H1 indicated by the arrow of the black-painted line in FIG. 5 and a second heat transfer path H2 indicated by the arrow of the white-painted line as two heat transfer paths that transmit heat from the liner 18 to the peripheral wall 11.

[0039] In the first heat transfer path H1, the heat transmitted from the liner 18 to the contact plate portion 46 of the liner-side support member 32 is transmitted through the intermediate heat insulating material 36 to the peripheral wall-side support member 31 and the peripheral wall 11. In other words, since the first heat transfer path H1 passes through the intermediate heat insulating material 36, the heat is blocked by the intermediate heat insulating material 36 and the heat insulating function is exerted.

[0040] The second heat transfer path H2 is such that the heat transmitted from the liner 18 to the contact plate portion 46 of the liner-side support member 32 is further transmitted to the connecting member 33 and the pressing member 52. At this time, since the connecting member 33 is non-contact with the first forming portion 41 through the opening 44, heat is not directly transferred from the connecting member 33 to the first forming portion 41. The heat transmitted to the pressing member 52 is transmitted to the peripheral wall-side support member 31 and the peripheral wall 11 through the support heat insulating material 35. In other words, since the second heat transfer path H2 passes through the support heat insulating material 35, heat is blocked by the support heat insulating material 35 and the heat insulating function is exerted.

[0041] Thus, according to the support mechanism 30 of the above embodiment, heat insulation can be achieved in the first heat transfer path H1 by the intermediate heat insulating material 36, and the heat insulating function can be exerted so as to achieve heat insulation in the second heat transfer path H2 by the support heat insulating material 35. Thereby, it is possible to suppress the heat of the high-temperature liquid L in the storage space S from being transferred from the liner 18 to the peripheral wall 11.

[0042] Moreover, as a horizontal support function in the support mechanism 30, the inward force applied to the liner 18 through the support heat insulating material 35 is transmitted to and supported by the peripheral wall 11. Thereby, compared with a configuration in which the liner 18 stands on its own or is supported only by the heat insulating layer 17, a state in which the liner 18 is supported along the peripheral wall 11 can be stably and favorably maintained. Further, the heat transfer to the peripheral wall 11 is suppressed by the heat insulating function, the temperature of the peripheral wall 11 becomes equal to or lower than a predetermined temperature, and the strength of the peripheral wall 11 is ensured, so that the horizontal support function by the support mechanism 30 can be favorably exerted.

[0043] Here, the support heat insulating material 35 and the intermediate heat insulating material 36 have both strength and heat insulating properties, but are more expensive than the heat insulating material used for the heat insulating layer 17. If the heat insulating material used for the support heat insulating material 35 is used for the heat insulating layer 17, the cost of the entire tank 10 becomes extremely high and is not realistic. In the above embodiment, since a plurality of support mechanisms 30 are scattered in the tank 10, the amount of the heat insulating material used for each of the heat insulating materials 35 and 36 can be significantly reduced. Thereby, while slightly suppressing the cost increase, both the above-described support function and heat insulating function can be obtained simultaneously.

[0044] Furthermore, in the support mechanism 30, it can be assembled and transported as one unit including all the above-described components. Thereby, the unitized support mechanism 30 can be pre-manufactured at a factory or the like in advance, and then, by installing the support mechanism 30 during the construction of the tank 10, the construction burden can be reduced.

[0045] As an example, since one end of the connecting member 33 is fixed to the liner side support member 32, one end of the connecting member 33 can be fixed to the liner side support member 32 at a factory or the like before being carried into the construction site of the tank 10. Thereby, at the construction site, the liner side support member 32 can be fixed to the outer surface side of the liner 18 by welding or the like, and the work burden at the construction site can be reduced.

[0046] Also, since the liner side support member 32 has the lower plate portion 48, the force due to the self-weight of the liner 18 can be transmitted to the heat insulating layer 17 to obtain the reaction force F22 from the heat insulating layer 17, and the vertical support function can be exhibited well. Furthermore, since the lower plate portion 48 is oriented in a substantially horizontal direction, the reaction force F22 from the heat insulating layer 17 can be easily applied to the lower plate portion 48.

[0047] Also, since the pair of side plate portions 49 are joined to the contact plate portion 46 and the lower plate portion 48, the pair of side plate portions 49 act as a reinforcing portion of the lower plate portion 48, and the rigidity for the lower plate portion 48 to receive the reaction force F22 can be ensured well.

[0048] Also, since the liner side support member 32 is formed in a box shape, it can be made into a unit in which the intermediate heat insulating material 36 is arranged and held in the space surrounded by the liner side support member 32, and their handleability can be enhanced.

[0049] Also, by sandwiching the intermediate heat insulating material 36 between the first forming portion 41 of the peripheral wall side support member 31 and the contact plate portion 46 of the liner side support member 32, the intermediate heat insulating material 36 can be fixed better.

[0050] In the above-described embodiment, the first forming portion 41 and the sandwiching portion 38 of the peripheral wall side support member 31 apply a sandwiching force to the support heat insulating material 35, and the sandwiching portion 38 applies a force to sandwich the intermediate heat insulating material 36 between the first forming portion 41 and the contact plate portion 46. Thereby, it is possible to suppress the occurrence of loss in the stress transmission in the configuration surrounded by the broken line in FIG. 4, the reaction force F12 from the peripheral wall 11 is likely to act, and the horizontal support function by the support mechanism 30 can be exhibited favorably.

[0051] Here, in the tank 10 of the present embodiment, as shown in FIGS. 6 and 7, it further includes a bottom side support mechanism 60 provided on a liner 18 that covers the heat insulating layer 17 on the bottom wall 12. FIG. 6 is a cross-sectional view of the bottom side support mechanism of the embodiment and its periphery. FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6.

[0052] The bottom side support mechanism 60 includes a contact plate portion 61 (not shown in FIG. 7) having a rectangular planar shape and along the outer surface of the liner 18, and four side plate portions 62 provided to project downward from the four sides of the contact plate portion 61 toward the heat insulating layer 17. Further, the bottom side support mechanism 60 includes a first reinforcing plate portion 63 provided in a space surrounded by the four side plate portions 62 and having a cross-shaped planar shape, and a second reinforcing plate portion 64 provided so as to close the lower portion of the side plate portion 62. In the bottom side support mechanism 60, the heat insulating material of the heat insulating layer 17 is also arranged in the space surrounded by the contact plate portion 61, the side plate portion 62, and the second reinforcing plate portion 64.

[0053] As an example, the contact plate portion 61, the side plate portion 62, the first reinforcing plate portion 63, and the second reinforcing plate portion 64 constituting the bottom side support mechanism 60 can use structural steel plates. The side plate portion 62 is joined to the contact plate portion 61, and the first reinforcing plate portion 63 and the second reinforcing plate portion 64 are joined to the side plate portion 62. Such joining can be exemplified by welding or the like.

[0054] The bottom support mechanism 60 has a support function in the horizontal direction of the liner 18. Specifically, when a horizontal force F31 acts on the liner 18, such force F31 is transmitted through the side plate portion 62 of the bottom support mechanism 60 to the heat insulation layer 17 in contact with the side plate portion 62. In the side plate portion 62, a reaction force F32 against the force F31 is obtained from the heat insulation layer 17, and the horizontal support function by the bottom support mechanism 60 is exerted.

[0055] The embodiments of the present invention are not limited to the above embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea of the present invention. Furthermore, if the technical idea of the present invention can be realized in another way by technological progress or another derived technology, it may be implemented using that method. Therefore, the claims cover all embodiments that can be included within the scope of the technical idea of the present invention.

[0056] In the above embodiment, the case where the liquid L to be stored is a heat storage material (molten salt) has been described. However, for example, it may be changed as long as it is a liquid, such as a liquid fossil fuel such as liquefied natural gas. When the liquid L to be stored is at a lower temperature than the outside air of the tank 10, the heat insulation function can suppress the temperature rise of the liquid L.

[0057] Also, in the support mechanism 30, the connecting member 33 may be directly fixed to the outer surface of the liner 18 without providing the liner side support member 32. However, providing the liner side support member 32 is advantageous in that it facilitates the fixing work of the support mechanism 30 and can better exert the support function of the support mechanism 30.

[0058] Also, the liner side support member 32 may have a configuration in which at least one of the upper plate portion 47, the lower plate portion 48, and the side plate portion 49 is omitted. However, by providing the lower plate portion 48, the vertical support function by the lower plate portion 48 can be exerted. Also, by providing the side plate portion 49, the lower plate portion 48 can be reinforced, and by forming a box shape with the upper plate portion 47, the lower plate portion 48, and the side plate portion 49, it becomes easier to handle the intermediate heat insulating material 36 in an integrated state with the liner side support member 32.

[0059] Further, the orientation of the lower plate portion 48 is not limited to a substantially horizontal direction, and may be inclined at a predetermined angle from the horizontal direction as long as the reaction force F22 from the heat insulation layer 17 can act thereon.

[0060] Also, in the support mechanism 30, the heat insulation function can be exhibited even if the intermediate heat insulating material 36 is omitted. However, providing the intermediate heat insulating material 36 between the liner side support member 32 and the peripheral wall side support member 31 can enhance the rigidity of the entire support mechanism 30 and exhibit the support function in the horizontal direction.

[0061] Further, the peripheral wall side support member 31 may be fixed to the inner surface side of the peripheral wall 11 and connected to the connecting member 33 via the support heat insulating material 35, and members other than the channel steel, such as using an L-shaped member or a cylindrical member, may be used as long as it is connected to the connecting member 33.

[0062] Also, as long as the clamping force can be applied as described above, the clamping portion 38 may have a configuration other than a screw structure, such as a configuration using a fitting structure.

[0063] Also, in the above embodiment, the clamping force is applied to the support heat insulating material 35 via the clamping portion 38 and the intermediate heat insulating material 36 is also clamped, but it is not limited thereto. For example, if each of the heat insulating materials 35 and 36 can be maintained in a state of being fixed to the peripheral wall side support member 31 or the liner side support member 32 by adhesion or the like, the clamping portion 38 may be omitted.

Explanation of Reference Numerals

[0064] 10: Tank 11: Peripheral wall 17: Heat insulation layer 18: Liner 30: Support mechanism 31: Peripheral wall side support member 32: Liner side support member 33: Connecting member 35: Support heat insulating material 36: Intermediate heat insulating material 38: Clamping portion 41: First forming portion 42: Second forming portion 44: Opening 46: Contact plate part (contact part) 48: Lower plate part (self-weight transmission part) 49: Side plate part (reinforcement part) L: Liquid S: Storage space

Claims

1. a peripheral wall oriented in the vertical direction to form a liquid storage space; a heat insulation layer provided on the inner surface side of the peripheral wall; a liner covering the inner surface side of the heat insulation layer; a tank comprising a plurality of support mechanisms for supporting the liner with respect to the peripheral wall, wherein the support mechanism includes a peripheral wall side support member fixed to the inner surface side of the peripheral wall, a connecting member fixed to the outer surface side of the liner and extending so as to straddle the peripheral wall side support member while being non-contact with the peripheral wall side support member, and a support heat insulating material connecting the peripheral wall side support member and the connecting member and transmitting an inward force applied to the liner from the connecting member to the peripheral wall side support member. The tank is characterized by this.

2. The tank according to claim 1, further comprising a liner side support member fixed to the outer surface side of the liner and to which one end of the connecting member is fixed.

3. The liner side support member includes a contact portion along the outer surface of the liner, and a self-weight transmission portion extending in a direction intersecting the vertical direction from the contact portion and transmitting a force due to the self-weight of the liner to the heat insulation layer. The tank according to claim 2 is characterized by this.

4. The tank according to claim 3, wherein the self-weight transmission portion is oriented in a substantially horizontal direction from the lower end of the contact portion.

5. The tank according to claim 4, wherein the liner side support member includes a reinforcing portion joined to the contact portion and the self-weight transmission portion.

6. The liner side support member is formed in a box shape including the contact portion and the self-weight transmission portion, and an intermediate heat insulating material is provided in a space surrounded by the liner side support member. The tank according to any one of claims 3 to 5 is characterized by this.

7. The tank according to claim 2, wherein an intermediate heat insulating material is disposed between the liner side support member and the peripheral wall side support member.

8. The peripheral wall side support member includes a first formed portion substantially parallel to the liner, and a second formed portion extending between the first formed portion and the peripheral wall, wherein the first formed portion sandwiches the liner side support member and the intermediate heat insulating material. The tank according to claim 7 is characterized by this.

9. The connecting member is disposed through an opening formed in the first formed portion, and a clamping portion is provided at the other end of the connecting member. The tank according to claim 8, wherein a clamping force is applied to the support heat insulating material by the clamping portion and the first forming portion.

10. The tank according to claim 9, wherein the clamping portion applies a clamping force to the intermediate heat insulating material by the liner side support member and the first forming portion.

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