Three-layer shell tank

Abstract

The three-shell tank has: a tank base; three shells consisting of an outer groove, an intermediate groove, and an inner groove disposed on the tank base; a first anchoring band passing through a first groove between the inner groove and the intermediate groove and a second groove between the intermediate groove and the outer groove, connecting the inner groove side plate to the tank base; and a second anchoring band passing through the second groove, connecting the intermediate groove side plate to the tank base. The first anchoring band has: a first end plate that is coupled to the inner groove side plate; a second end plate that is coupled to the tank base; a first intermediate portion that is coupled to the inner wall side portion exposed in the first groove of the intermediate groove between the first end plate and the second end plate; and a second intermediate portion that is coupled to the outer wall side portion exposed in the second groove of the intermediate groove.

Description

Technical Field

[0001] This disclosure relates to a flat-bottomed, three-layered shell tank for storing cryogenic liquefied gas. Background Technology

[0002] Previously, flat-bottomed, three-layered tanks for storing cryogenic liquefied gases have been proposed. For example, a flat-bottomed, three-layered tank is disclosed in Patent Document 1.

[0003] In the three-layer tank disclosed in Patent Document 1, an outer groove is provided on a concrete tank foundation. A base plate made of pearlitic concrete with a cooling effect is provided on the bottom plate of the outer groove. An intermediate groove is provided on the base plate. A horizontal concrete layer is provided on the bottom plate of the intermediate groove. An inner groove is provided on the horizontal concrete layer. A mounting seat is provided between the bottom plate of the inner groove and the horizontal concrete layer, supporting the periphery of the bottom plate of the inner groove in a sliding manner. The outer periphery of the mounting seat extends to near the inner wall of the intermediate groove, and can abut against a locking piece provided on the inner wall of the intermediate groove from below. One end of a first anchoring band (anchor component) is connected to a side plate of the inner groove, and the other end is connected to the mounting seat. One end of a second anchoring band is connected to a side plate of the intermediate groove, and the other end extends into the tank foundation and is fixed.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 55-20937 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the three-shell tank of Patent Document 1, one end of the first anchoring band is connected to the side plate of the inner tank, and the other end is connected to a mounting seat disposed between the bottom plate of the inner tank and the bottom plate of the intermediate tank. The mounting seat engages with the inner tank by friction, but is not fixed to the inner tank and the intermediate tank, nor to the tank foundation. Although it is preferable that one end of the anchoring band is fixed to the tank foundation, since there is an intermediate tank and an outer tank between the inner tank and the tank foundation in a typical three-shell tank, it is difficult to maintain airtightness between the inside and outside of the intermediate tank and to connect the inner tank and the tank foundation using the anchoring band.

[0009] This disclosure was made in view of the above circumstances, and proposes a structure in which the inner tank and the tank foundation are connected by anchoring bands in a three-shell tank having a tank foundation and a three-shell consisting of an outer tank, a middle tank and an inner tank set on the tank foundation.

[0010] Methods for solving problems

[0011] One aspect of the three-layer shell tank disclosed herein is characterized by comprising: a tank base; an outer tank having an outer tank bottom plate disposed on the tank base, a cylindrical outer tank side plate rising from the outer tank bottom plate, and an outer tank roof covering the upper portion of the outer tank side plate; an intermediate tank having an intermediate tank bottom plate disposed on the outer tank bottom plate with an outer bottom insulation layer, a cylindrical intermediate tank side plate rising from the intermediate tank bottom plate, and an intermediate tank roof covering the upper portion of the intermediate tank side plate; and an inner tank for storing liquefied gas, the inner tank having an inner tank bottom plate disposed on the outer tank bottom plate with an inner bottom insulation layer, a cylindrical inner tank side plate rising from the inner tank bottom plate, and an inner tank roof covering the upper portion of the inner tank side plate. The tank roof; a first anchoring band passing through a first slot between the inner and intermediate tanks and a second slot between the intermediate and outer tanks, connecting the inner tank side plate and the tank foundation; and a second anchoring band passing through the second slot, connecting the intermediate tank side plate and the tank foundation, the first anchoring band having: a first end plate engaged with the inner tank side plate; a second end plate engaged with the tank foundation; a first intermediate portion engaged between the first end plate and the second end plate and an exposed inner wall side portion in the first slot of the intermediate tank; and a second intermediate portion engaged with an exposed outer wall side portion in the second slot of the intermediate tank.

[0012] Invention Effects

[0013] According to this disclosure, it is possible to propose a structure in which the inner tank and the tank foundation are connected by anchoring bands in a three-shell tank having a tank foundation and a three-shell consisting of an outer tank, a middle tank and an inner tank disposed on the tank foundation. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view showing the overall structure of a three-shell tank according to an embodiment of the present disclosure.

[0015] Figure 2 This is a diagram illustrating the first example of a connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0016] Figure 3 This is a diagram illustrating the second example of the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0017] Figure 4 This is a diagram illustrating the third example of the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0018] Figure 5 This is a diagram illustrating a variation of the third example of the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0019] Figure 6 This is a diagram illustrating the fourth example of the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0020] Figure 7 This is the fifth example illustrating the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band.

[0021] Figure 8 This is the sixth example illustrating the connection structure between the inner tank side plate and the tank foundation based on the first anchoring band. Detailed Implementation

[0022] The embodiments of this disclosure will be described with reference to the accompanying drawings. Figure 1 This is a cross-sectional view showing the overall structure of the three-shell tank 1 according to an embodiment of the present disclosure.

[0023] Figure 1 The three-shell tank 1 shown is a flat-bottomed, ground-fixed three-shell tank. The three-shell tank 1 has a concrete tank foundation 7, an outer groove 5 set on the tank foundation 7, an intermediate groove 4 enclosing the outer groove 5, and an inner groove 3 enclosing the intermediate groove 4. The outer groove 5, the intermediate groove 4, and the inner groove 3 form a three-shell structure.

[0024] The inner tank 3 is a container for storing cryogenic liquefied gases. Examples of cryogenic liquefied gases include liquid helium, liquid hydrogen, liquid nitrogen, LNG, and LPG. A concrete dike 6 is provided around the three-layer tank 1. The inner tank 3 has a generally flat inner tank bottom plate 31, cylindrical inner tank side plates 32 rising from the inner tank bottom plate 31, and a hemispherical inner tank roof 33 located on the upper part of the inner tank side plates 32.

[0025] The intermediate channel 4 surrounds the inner channel 3. The intermediate channel 4 has a generally flat intermediate channel bottom plate 41, a cylindrical intermediate channel side plate 42 rising from the intermediate channel bottom plate 41, and a hemispherical intermediate channel roof 43 disposed on the upper part of the intermediate channel side plate 42. A horizontal concrete layer 35 and an inner bottom insulation layer 36 are sandwiched between the intermediate channel bottom plate 41 and the inner channel bottom plate 31. In addition, the intermediate channel roof 43 can also support the inner channel roof 33.

[0026] The outer trough 5 surrounds the intermediate trough 4. The outer trough 5 has a generally flat outer trough bottom plate 51 set on the tank foundation 7, a cylindrical outer trough side plate 52 rising from the outer trough bottom plate 51, and a hemispherical (dome-shaped) outer trough roof 53 set on the upper part of the outer trough side plate 52. A horizontal concrete layer 45 and an outer bottom insulation layer 46 are sandwiched between the outer trough bottom plate 51 and the intermediate trough bottom plate 41. The outer trough side plate 52 is connected to the tank foundation 7 by anchor bolts 56. Alternatively, the outer trough bottom plate 51 can also be fixed to an anchor plate cast in the tank foundation 7.

[0027] A first compartment 61 is formed by a gap between the outer wall of the inner compartment 3 and the inner wall of the intermediate compartment 4. A second compartment 62 is formed by a gap between the outer wall of the intermediate compartment 4 and the inner wall of the outer compartment 5. The first compartment 61 and the second compartment 62 are filled with insulating material 63. The insulating material 63 can be, for example, pearlescent material, glass wool, or other insulating materials commonly used in multi-layered tanks.

[0028] A BOG (Bottle-Off Gas) pipe 22 is provided at the top of the inner tank 3. This BOG pipe 22 transports the vaporized gas generated within the inner tank 3 to the outside of the triple-shell tank 1. An outlet pipe (not shown) is provided at the bottom of the inner tank 3. The liquefied gas from the inner tank 3 is transported to the outside through this outlet pipe. However, the outlet pipe may also be configured to extend upwards within the inner tank 3 and transport the liquefied gas to the outside through the upper part of the triple-shell tank 1. A connecting pipe 21 is provided on the inner tank roof 33 of the inner tank 3, connecting the upper part of the inner tank 3 to the first compartment 61. The vaporized gas of the liquefied gas generated in the inner tank 3 flows into the first compartment 61 through this connecting pipe 21. Thus, the first compartment 61 is filled with the vaporized gas of the liquefied gas. However, a low-boiling-point gas, equivalent to the vaporized gas of liquefied gas, can also be introduced into the first tank 61 from the outside of the three-shell tank 1. Alternatively, the vaporized gas of liquefied gas can be introduced into the first tank 61 through a branch pipe of the BOG pipe 22 connected to the first tank 61.

[0029] The intermediate tank 4, which separates the first tank 61 and the second tank 62, is airtight, thus separating the two tanks as spaces. Inert gas is supplied to the second tank 62 from the inlet pipe 23 from the inert gas supply source 24, filling the second tank 62 with inert gas. This inert gas is a gas with a boiling point higher than that of the liquefied gas stored in the inner tank 3. Nitrogen is an example of such an inert gas.

[0030] The inner tank side plate 32 and the tank foundation 7 are connected by first anchoring bands 9. Multiple first anchoring bands 9 are arranged approximately equally spaced circumferentially around the inner tank side plate 32. The first anchoring bands 9 pass through the first slot 61 and the second slot 62. The intermediate tank side plate 42 is connected to the tank foundation 7 by second anchoring bands 10. Multiple second anchoring bands 10 are arranged approximately equally spaced circumferentially around the intermediate tank side plate 42. The second anchoring bands 10 pass through the second slot 62. The first anchoring bands 9 and the second anchoring bands 10 are strip-shaped components made of a raw material with low-temperature toughness (e.g., SUS). However, the first anchoring bands 9 and the second anchoring bands 10 can also be shaft-shaped or wire-shaped components.

[0031] The first end 91, which is the upper end of the first anchoring band 9, is joined to the outer wall of the inner tank side plate 32. The first end 91 of the first anchoring band 9 can be joined to the outer wall of the inner tank side plate 32 in a manner that allows vertical displacement on the outer wall of the inner tank side plate 32. The second end 92, which is the lower end of the first anchoring band 9, is joined to the bottom of the anchor box 71, which penetrates the bottom plate of the outer tank and is embedded in the tank foundation 7, by welding.

[0032] [Based on the connection structure between the inner side plate 32 of the first anchoring band 9 and the tank foundation 7]

[0033] In addition to having a first end 91 that engages with the inner tank side plate 32 and a second end 92 that engages with the tank foundation 7, the first anchoring band 9 also has a first intermediate portion 93 that engages with the inner wall side portion exposed in the first slot 61 of the intermediate tank 4 between the first end 91 and the second end 92, and a second intermediate portion 94 that engages with the outer wall side portion exposed in the second slot 62 of the intermediate tank 4. Hereinafter, examples 1 to 6 of the connection structure between the inner tank side plate 32 and the tank foundation 7 based on the first anchoring band 9 will be described.

[0034] <Example 1>

[0035] Figure 2 This diagram illustrates the first example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 2 In the first example shown, the first end 91 of the first anchoring band 9 is connected to the outer wall of the inner tank side plate 32, and the second end 92 is connected to the tank base 7. In this first example, the first anchoring band 9 is continuous from the first end 91 to the second end 92, and is inserted through the intermediate tank bottom plate 41 between the first end 91 and the second end 92. Furthermore, the intermediate tank bottom plate 41 is composed of a bottom plate 41a forming the central portion and an annular plate 41b disposed around the periphery of the bottom plate 41a and having a wall thickness thicker than the bottom plate 41a. Preferably, the first anchoring band 9 is inserted through the annular plate 41b.

[0036] In the first anchoring band 9, the first intermediate portion 93 is located directly above the portion that penetrates and inserts into the intermediate trough bottom plate 41, and the second intermediate portion 94 is located directly below the portion that penetrates and inserts into the intermediate trough bottom plate 41. Furthermore, the inner wall of the intermediate trough bottom plate 41 is welded to the first intermediate portion 93 of the first anchoring band 9, and the outer wall of the intermediate trough bottom plate 41 is welded to the second intermediate portion 94 of the first anchoring band 9. The gaps between the first intermediate portion 93 and the intermediate trough bottom plate 41, and between the second intermediate portion 94 and the intermediate trough bottom plate 41, are filled by welding, maintaining the airtightness of the intermediate trough 4 both inside and out.

[0037] In addition, in Examples 1 to 6, one end 10a of the second anchoring band 10 is joined to the outer wall of the intermediate trough side plate 42 by welding or other methods, and the other end 10b of the second anchoring band 10 is joined to the anchor box 72 that penetrates the bottom plate 51 of the outer trough and is embedded in the tank foundation 7 by welding.

[0038] <Example 2>

[0039] Figure 3 This diagram illustrates the second example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 3 In the second example shown, the intermediate trough bottom plate 41 has a first joint 75 provided on the inner wall side and a second joint 76 provided on the outer wall side. Preferably, the first joint 75 and the second joint 76 are provided on the annular plate 41b of the intermediate trough bottom plate 41.

[0040] In the second example, the first anchoring band 9 is cut between the first intermediate portion 93 and the second intermediate portion 94, and is composed of a first band member 9a extending from the first end 91, which is coupled to the inner tank side plate 32, to the first intermediate portion 93, which is coupled to the first joint portion 75, and a second band member 9b extending from the second intermediate portion 94, which is coupled to the second joint portion 76, to the second end 92, which is coupled to the tank base 7. The first band member 9a and the second band member 9b are arranged in a substantially straight line. The first intermediate portion 93 of the first anchoring band 9 is joined to the first joint portion 75 by welding. Similarly, the second intermediate portion 94 of the first anchoring band 9 is joined to the second joint portion 76 by welding.

[0041] In the second example, compared with the first example, the first anchoring band 9 does not penetrate the intermediate groove 4, so the airtightness of the intermediate groove 4 will not be reduced, and the leakage of gas from the first groove 61 to the second groove 62 can be more strictly prevented.

[0042] <Example 3>

[0043] Figure 4 This diagram illustrates the third example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 4 In the third example shown, the intermediate trough bottom plate 41 has a first joint 77 provided on the inner wall side and a second joint 78 provided on the outer wall side. Preferably, the first joint 77 and the second joint 78 are provided on the annular plate 41b of the intermediate trough bottom plate 41. Elongated holes that are substantially parallel to the extending direction of the first anchoring band 9 are provided on the first joint 77 and the second joint 78.

[0044] In the third example, the first anchoring band 9 is cut off between the first intermediate portion 93 and the second intermediate portion 94, and is composed of a first band member 9a extending from the first end 91, which is coupled to the inner tank side plate 32, to the first intermediate portion 93, which is coupled to the first connecting portion 77, and a second band member 9b extending from the second intermediate portion 94, which is coupled to the second connecting portion 78, to the second end 92, which is coupled to the tank base 7. The first band member 9a and the second band member 9b are arranged in a substantially straight line. The first intermediate portion 93 and the first connecting portion 77 of the first anchoring band 9 are rotatably engaged by a pin. Specifically, the first intermediate portion 93 and the first connecting portion 77 are engaged by a pin through an elongated hole in the first intermediate portion 93 and the first connecting portion 77 of the first band member 9a. The engagement position of the first intermediate portion 93 is variable within the range of the elongated hole provided in the first connecting portion 77. Similarly, the second intermediate portion 94 of the first anchoring band 9 is rotatably engaged with the second connecting portion 76 by a pin. Specifically, the second intermediate portion 94 of the second band member 9b is engaged with the second connecting portion 78 by a pin through a bolt passing through an elongated hole in the second intermediate portion 94 and the second connecting portion 78. The engagement position of the second intermediate portion 94 is variable within the range of the elongated hole in the second connecting portion 78. However, it is also possible that not both the first intermediate portion 93 and the second intermediate portion 94 are pinned together, but only either the first intermediate portion 93 or the second intermediate portion 94.

[0045] Figure 5 This figure illustrates a modified example of the third instance of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. In this modified example, with... Figure 4 Similarly, in the example shown, a first connecting portion 77 and a second connecting portion 78 are provided on the annular plate 41b of the intermediate groove bottom plate 41. Furthermore, the first intermediate portion 93 of the first anchoring band 9 is engaged with the first connecting portion 77 by a pin through a bolt passing through the elongated hole of the first connecting portion 77. The engagement position of the first intermediate portion 93 is variable within the range of the elongated hole provided in the first connecting portion 77. Furthermore, the second intermediate portion 94 of the first anchoring band 9 is engaged with the second connecting portion 78 by a pin through a bolt passing through the elongated hole of the second connecting portion 78. The engagement position of the second intermediate portion 94 is variable within the range of the elongated hole provided in the second connecting portion 78.

[0046] In the third example (and its variations), compared to the first example, the first anchoring band 9 does not penetrate the intermediate groove 4, therefore the airtightness of the intermediate groove 4 is not reduced, and leakage of gas from the first groove 61 to the second groove 62 can be more strictly prevented. Furthermore, in the third example, compared to the second example, the first intermediate portion 93 and the second intermediate portion 94 can be displaced within the range of the elongated hole, thus mitigating the stress acting on the first anchoring band 9 due to the thermal contraction of the inner groove 3 through the displacement of the first intermediate portion 93 and the second intermediate portion 94.

[0047] <Example 4>

[0048] Figure 6 This is a diagram illustrating the fourth example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 6 In the fourth example shown, a connecting box 80 with a side plate 81 and an upper plate 82 is provided on the bottom plate 41 of the intermediate trough. The side plate 81 is a cylindrical component welded and fixed to the annular plate 41b of the bottom plate 41 of the intermediate trough, and the upper part of the side plate 81 is closed by the upper plate 82. A telescopic part is provided on the upper plate 82. The telescopic part is realized, for example, by corrugations formed on the upper plate 82.

[0049] In Example 4, the first anchoring band 9 is a continuous strip or line-like component from the first end 91 to the second end 92, inserted through the upper plate 82 between the first end 91 and the second end 92. The first intermediate portion 93 is directly above the portion of the first anchoring band 9 that is inserted through the upper plate 82, and the second intermediate portion 94 is directly below the portion that is inserted through the upper plate 82. Furthermore, the upper surface of the upper plate 82 is welded to the first intermediate portion 93 of the first anchoring band 9, and the lower surface of the upper plate 82 is welded to the second intermediate portion 94 of the first anchoring band 9. The gaps between the upper plate 82 and the first intermediate portion 93, and between the upper plate 82 and the second intermediate portion 94, are filled by welding to maintain the airtightness of the intermediate groove 4.

[0050] In the fourth example, a telescopic part is provided on the connecting box 80, so compared with the first example, the stress acting on the intermediate groove 4 due to the thermal contraction of the inner groove 3 can be mitigated by the deformation of the telescopic part.

[0051] <Example 5>

[0052] Figure 7 This is a diagram illustrating the fifth example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 7 In the fifth example shown, a connecting box 80 with a side plate 81 and an upper plate 82 is provided on the bottom plate 41 of the intermediate trough. The side plate 81 is a cylindrical component welded and fixed to the annular plate 41b of the bottom plate 41 of the intermediate trough, and the upper part of the side plate 81 is closed by the upper plate 82. A telescopic part is provided on the upper plate 82. The telescopic part is formed by a telescopic tube through the side plate 81.

[0053] In Example 5, the first anchoring band 9 is a continuous strip or line-like component from the first end 91 to the second end 92, inserted through the upper plate 82 between the first end 91 and the second end 92. The upper part of the portion of the first anchoring band 9 that penetrates the upper plate 82 is the first intermediate portion 93, and the lower part is the second intermediate portion 94. However, the first anchoring band 9 may also be cut off between the first intermediate portion 93 and the second intermediate portion 94 without penetrating the upper plate 82. Furthermore, the upper surface of the upper plate 82 is welded to the first intermediate portion 93 of the first anchoring band 9, and the lower surface of the upper plate 82 is welded to the second intermediate portion 94 of the first anchoring band 9. The gaps between the upper plate 82 and the first intermediate portion 93, and between the upper plate 82 and the second intermediate portion 94, are filled by welding to maintain the airtightness of the intermediate groove 4.

[0054] In the fifth example, a telescopic part is provided on the connecting box 80, so compared with the first example, the stress acting on the intermediate groove 4 due to the thermal contraction of the inner groove 3 can be mitigated by the deformation of the telescopic part.

[0055] <Example 6>

[0056] Figure 8 This is a diagram illustrating the sixth example of the connection structure between the inner tank side plate 32 based on the first anchoring band 9 and the tank foundation 7. Figure 8 In the sixth example shown, the intermediate trough bottom plate 41 has an annular plate 41b forming the periphery of the intermediate trough bottom plate 41 and a bracket 84 fixed to the annular plate 41b and the intermediate trough side plate 42 by welding on the inner wall side portion of the intermediate trough 4.

[0057] In Example 6, the first anchoring band 9 is cut off between the first intermediate portion 93 and the second intermediate portion 94, and is composed of a first band member 9a extending from the first end 91, which is connected to the outer wall of the inner trough side plate 32, to the first intermediate portion 93, which is connected to the bracket 84, and a second band member 9b extending from the second intermediate portion 94, which is connected to the outer wall of the intermediate trough side plate 42, to the second end 92, which is connected to the tank base 7. That is, the first band member 9a and the second band member 9b are connected by a rigid body composed of the annular plate 41b of the intermediate trough bottom plate 41, the lower part of the intermediate trough side plate 42, and the bracket 84.

[0058] In the sixth example, the second belt component 9b is integrated with the second anchoring belt 10. Therefore, compared with the first to fifth examples, it is preferable to use a wider or thicker belt component for the second anchoring belt 10 in the sixth example. However, it is also possible to provide the second belt component 9b and the second anchoring belt 10 separately and arrange them in an orderly manner.

[0059] In the sixth example, compared with the first example, the first anchoring band 9 does not penetrate the intermediate groove 4. Therefore, the airtightness of the intermediate groove 4 is not reduced, and the leakage of gas from the first groove 61 to the second groove 62 can be more strictly prevented.

[0060] 〔Summarize〕

[0061] As described above, the three-layer shell tank 1 of this embodiment includes: a tank base 7; an outer tank 5 having an outer tank bottom plate 51 disposed on the tank base 7, a cylindrical outer tank side plate 52 erected from the outer tank bottom plate 51, and an outer tank roof 53 covering the upper part of the outer tank side plate 52; an intermediate tank 4 having an intermediate tank bottom plate 41 disposed on the outer tank bottom plate 51 with an outer bottom insulation layer 46 in between, a cylindrical intermediate tank side plate 42 erected from the intermediate tank bottom plate 41, and an intermediate tank roof 43 covering the upper part of the intermediate tank side plate 42; and an inner tank 3, which stores liquefied gas inside. The inner tank 3 has an inner tank bottom plate 31 disposed on the intermediate tank bottom plate 41 with an inner bottom insulation layer 36 between it, a cylindrical inner tank side plate 32 erected from the inner tank bottom plate 31, and an inner tank roof 33 disposed on the upper part of the inner tank side plate 32; a first anchoring band 9 passing through a first slot 61 which serves as the slot between the inner tank 3 and the intermediate tank 4, and a second slot 62 which serves as the slot between the intermediate tank 4 and the outer tank 5, connecting the inner tank side plate 32 and the tank foundation 7; and a second anchoring band 10 passing through a second slot 62, connecting the intermediate tank side plate 42 and the tank foundation 7.

[0062] Furthermore, the first anchoring band 9 is characterized in that it has a first end 91 that is coupled to the inner groove side plate 32 and a second end 92 that is coupled to the tank base 7. The first anchoring band 9 has a first intermediate portion 93 that is coupled to the inner wall side portion exposed in the first groove 61 of the intermediate groove 4 and a second intermediate portion 94 that is coupled to the outer wall side portion exposed in the second groove 62 of the intermediate groove 4 between the first end 91 and the second end 92.

[0063] In the three-layer shell tank 1 with the above structure, the inner tank side plate 32 and the tank foundation 7 can be connected by the first anchoring band 9 while the intermediate groove 4 is sandwiched.

[0064] In the above embodiment, the first tank 61 is connected to the interior of the inner tank 3, the first tank 61 is filled with the vaporized gas of liquefied gas, and the second tank 62 is filled with a gas with a boiling point higher than that of liquefied gas.

[0065] The first anchoring band 9 is joined to the inner wall of the intermediate groove 4 at the first intermediate portion 93 and to the outer wall of the intermediate groove 4 at the second intermediate portion 94. Therefore, the first anchoring band 9 can be installed while maintaining the airtightness of the intermediate groove 4. Thus, even if different gases are filled in the first groove 61 and the second groove 62 as described above, leakage or mixing of these gases can be prevented. Furthermore, when the first groove 61 is internally connected to the inner groove 3 and is filled with vaporized gas, the pressure difference between the inner and outer grooves can be reduced, thereby reducing the stress applied to the first anchoring band 9.

[0066] As shown in Example 1, the first anchoring band 9 may be a continuous strip or line component from the first end 91 to the second end 92, inserted through the intermediate groove bottom plate 41 between the first end 91 and the second end 92, and the first intermediate part 93 and the second intermediate part 94 are joined to the intermediate groove bottom plate 41 by welding.

[0067] As shown in examples 2 and 3, the intermediate tank bottom plate 41 may have a first joint portion 75, 77 disposed on the inner wall side portion and a second joint portion 76, 78 disposed on the outer wall side portion. The first anchoring band 9 is composed of a first band member 9a extending from a first end portion 91 that is joined with the inner tank side plate 32 to a first intermediate portion 93 that is joined with the first joint portion 75, 77, and a second band member 9b extending from a second intermediate portion 94 that is joined with the second joint portion 76, 78 to a second end portion 92 that is joined with the tank base 7. Here, the first band member 9a and the second band member 9b may be arranged in a substantially straight line.

[0068] As shown in Example 3, at least one of the first intermediate portion 93 and the second intermediate portion 94 can be engaged by a pin.

[0069] As shown in examples 4 and 5, the intermediate trough bottom plate 41 may have a connecting box 80 comprising a side plate 81 and a top plate 82, wherein the first intermediate portion 93 and the second intermediate portion 94 are joined to the top plate 82 by welding. Here, it is preferable that at least one of the side plate 81 and the top plate 82 has a telescopic portion. In addition, the first anchoring band 9 may be a continuous strip or line component from the first end 91 to the second end 92.

[0070] As shown in Example 6, the intermediate trough bottom plate 41 has an annular plate 41b disposed on the periphery of the intermediate trough bottom plate 41 and a bracket 84 fixed to the annular plate 41b and the intermediate trough side plate 42 on the inner wall side of the intermediate trough 4. The first anchoring band 9 is composed of a first band member 9a from a first end 91 that is coupled to the inner trough side plate 32 to a first intermediate portion 93 that is coupled to the bracket 84 and a second band member 9b from a second intermediate portion 94 that is coupled to the outer wall side of the intermediate trough side plate 42 to a second end 92 that is coupled to the tank base 7. The second anchoring band 10 can be integrated with the second band member 9b or arranged with the second band member 9b.

[0071] The preferred embodiments of this disclosure have been described above. However, without departing from the spirit of this disclosure, modifications to the specific structure and / or function of the above embodiments may also be included in this invention. For example, the above structure can be modified as follows.

[0072] For example, in the above embodiment, the inner groove 3, the middle groove 4 and the outer groove 5 are cylindrical flat-bottomed cans, but are not limited to cylindrical, and can also be approximately polygonal cylindrical flat-bottomed cans.

[0073] For example, in the above embodiment, a liquid-proof dike 6 is provided around the three-layer shell tank 1, but the liquid-proof dike 6 can also be omitted.

[0074] Label Explanation

[0075] 1: Three-layer shell tank; 3: Inner tank; 4: Intermediate tank; 5: Outer tank; 7: Tank foundation; 9: First anchoring band; 9a: First band component; 9b: Second band component; 10: Second anchoring band; 31: Inner tank bottom plate; 32: Inner tank side plate; 33: Inner tank roof; 36: Inner bottom insulation layer; 41: Intermediate tank bottom plate; 41b: Annular plate; 42: Intermediate tank side plate; 43: Intermediate tank roof; 46 51: Outer bottom insulation layer; 52: Outer groove bottom plate; 53: Outer groove side plate; 64: Outer groove roof; 65: First groove compartment; 66: Second groove compartment; 77: First joint; 78: Second joint; 81: Side plate; 82: Top plate; 84: Bracket; 91: First end; 92: Second end; 93: First middle part; 94: Second middle part.

Claims

1. A three-layer shell tank, comprising: Tank foundation; The outer tank has an outer tank bottom plate disposed on the tank base, a cylindrical outer tank side plate erected from the outer tank bottom plate, and an outer tank roof covering the upper part of the outer tank side plate; The intermediate trough has an intermediate trough bottom plate disposed on the outer trough bottom plate separated by an outer bottom insulation layer, a cylindrical intermediate trough side plate erected from the intermediate trough bottom plate, and an intermediate trough roof covering the upper part of the intermediate trough side plate. The inner tank, which stores liquefied gas inside, has an inner tank bottom plate disposed on the intermediate tank bottom plate through an inner bottom insulation layer, a cylindrical inner tank side plate standing up from the inner tank bottom plate, and an inner tank roof disposed on the upper part of the inner tank side plate. The first anchoring band passes through the first slot between the inner trough and the intermediate trough and the second slot between the intermediate trough and the outer trough, connecting the inner trough side plate and the tank foundation. as well as The second anchoring strip passes through the second slot and connects the intermediate slot side plate to the tank foundation. The first anchoring band has: The first end is connected to the inner groove side plate; The second end is connected to the tank foundation; A first intermediate portion, which joins the inner wall portion exposed between the first end and the second end in the intermediate groove; and The second middle section is joined to the outer wall side portion exposed between the second grooves in the middle groove.

2. The three-layer shell tank according to claim 1, wherein, The first anchoring band is a continuous strip or line component from the first end to the second end, inserted through the middle groove bottom plate between the first end and the second end, and the first middle part and the second middle part are joined to the middle groove bottom plate by welding.

3. The three-layer shell tank according to claim 1, wherein, The intermediate groove bottom plate has a first joint portion disposed on the inner wall side portion and a second joint portion disposed on the outer wall side portion. The first anchoring band is composed of a first band member extending from the first end portion connected to the inner tank side plate to the first intermediate portion connected to the first joint, and a second band member extending from the second intermediate portion connected to the second joint to the second end portion connected to the tank foundation.

4. The three-layer shell tank according to claim 3, wherein, The first belt component and the second belt component are arranged in a generally straight line.

5. The three-layer shell tank according to claim 3 or 4, wherein, At least one of the first intermediate portion and the second intermediate portion is engaged by a pin.

6. The three-layer shell tank according to claim 1, wherein, The intermediate trough bottom plate has a box including side plates and a top plate. The first anchoring band is used to weld the first middle section and the second middle section to the upper plate.

7. The three-layer shell tank according to claim 6, wherein, At least one of the side plate and the top plate of the intermediate groove bottom plate has a telescopic portion.

8. The three-shell tank according to claim 6 or 7, wherein, The first anchoring band is a continuous strip or line component from the first end to the second end.

9. The three-layer shell tank according to claim 1, wherein, The intermediate groove bottom plate has: An annular plate, disposed at the periphery of the bottom plate of the intermediate groove; and A bracket, which is fixed to the annular plate and the side plate of the intermediate groove on the inner wall side of the intermediate groove. The first anchoring band is composed of a first band component extending from the first end connected to the inner tank side plate to the first intermediate portion connected to the bracket, and a second band component extending from the second intermediate portion connected to the outer wall side portion of the intermediate tank side plate to the second end connected to the tank foundation. The second anchoring band is integrated with the second band component or arranged in a specific configuration with the second band component.

10. The three-shell tank according to any one of claims 1 to 4, 6 to 7, and 9, wherein, The first tank is filled with the vaporized gas of the liquefied gas. The second tank is filled with a gas whose boiling point is higher than that of the liquefied gas.

11. The three-layer shell tank according to claim 10, wherein, The first groove is connected to the inner groove.

Images