JP2003294197A - Heat insulating structure for cryogenic tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating structure for cryogenic tank which reduces the amount of the bending moment to zero or greatly though the maximum bending moment acts on the stud bolts located near the boundary between the semi-spherical part of the cylindrical tank and the cylindrical body. <P>SOLUTION: In the cryogenic tank, a wire net 3a for reinforcement is interposed in the middle position of an inside-and-outside laminated part 2a, 2b of the two-layer laminated structure consisting of a synthetic resin foaming body. The tank consists of a cylindrical tank 1 integrally connected a semi- spherical part 1a to both ends of a cylindrical body 1b, and a cord body 4A such as a wire and a rope is used as a supporting tool 4 for fixing the inner side laminated part 2a to the tank body 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

The present invention relates to liquefied petroleum gas (LP
G), liquefied natural gas (LNG), liquefied hydrogen (LH2),
The present invention relates to a heat insulating structure for a cryogenic tank for storing cryogenic substances such as liquefied nitrogen (LN2), liquefied oxygen (LO2) and liquefied helium (LHe).

[0002]

2. Description of the Related Art In a cryogenic tank of this kind, it is necessary to coat the surface thereof with a heat insulating layer in order to prevent heat from entering the tank from the outside air. This heat insulating layer is generally made of synthetic polyurethane foam such as hard polyurethane or phenolic resin, and a mesh reinforcing material is interposed between the inner heat insulating layer and the outer heat insulating layer, so that the synthetic resin is self-expanded during foaming. It has a structure in which it is bonded by an adhesive action or an adhesive to be integrated. The mesh-like reinforcing material is mainly interposed to prevent cold cracking of the outer heat-insulating layer portion.

The tank body is made of stainless steel or aluminum alloy, and the heat insulating layer covering the outer peripheral surface of the tank body has a large number of stud bolts or the like planted at regular intervals on the peripheral surface of the tank body. Supported by the support. Especially in the case of a spherical tank, the heat insulating layer is prevented from falling in the lower half of the tank. Those supports are
Usually, it is formed of stainless steel or aluminum alloy, which is the same material as the tank.

Further, the heat-insulating layer is made of a synthetic resin foam such as hard urethane or phenol resin which has been molded in advance, and a mesh-like reinforcing member is interposed between the heat-insulating layer and the surface layer of aluminum alloy (also as an aluminum foil surface sheet material). The heat insulating panels having a convex cross section and having a fixed shape are mounted on the surface of the tank body adjacent to each other, and the joints between the protrusions of the heat insulating panel are at least filled with synthetic resin material or buried by foaming. The structure is generally used.

As a prior art relating to such a heat insulating structure for a cryogenic tank, a technique described in Japanese Patent Laid-Open No. 8-233199 is known.

By the way, in the case of a spherical tank, FIG.
As shown in FIG. 1, when the tank 51 expands / contracts, the tank 51 expands / contracts substantially uniformly in the radial direction toward the inner center 51o thereof. Only the axial force is applied, and no bending moment is generated.

[0007]

However, in the case of such a spherical tank, a bending moment is not generated in the stud bolt 52, but hemispherical portions are provided at both ends of the cylindrical body portion (cylindrical portion). In the case of the cylinder type tank provided integrally, a bending moment may be generated in the stud bolt as the support tool.

That is, as shown in FIG. 12 (a), in a tank body 1 of a cylinder type tank, a cylindrical body portion 1b forming an intermediate portion thereof and a hemispherical surface portion 1a provided on both sides thereof are provided. The center of heat shrinkage is different, and a temperature gradient occurs in the thickness direction of the heat insulating panel. Therefore, the surface portion of the heat insulating layer 2 (heat insulating panel), the inner surface portion in contact with the tank body 1, and the heat insulating layer 2 which is intermediate between the two (consisting of a two-layer laminated structure of an inner heat insulating laminated portion 2a and an outer heat insulating laminated portion 2b). The amount of heat shrinkage is different in the middle part. As a result, the maximum bending moment acts on the stud bolt 21 arranged near the boundary line between the hemispherical surface portion 1a and the cylindrical body portion 1b.

The lower end of the stud bolt 21 is shown in FIG.
As shown in FIG. 2 (b), it is fixed to the tank body 1 by welding. In addition, since the connecting wire net 3b of the reinforcing material 3 is arranged over the wire net 3a of the net-like reinforcing material 3 of the heat insulating panel 2, the stud bolt 2
The upper end of 1 passes through the connecting wire net 3b and holds the connecting portion with an upper nut 8 having a washer 7 inserted therein. Further, the washer 7 is made of synthetic resin and is shown in FIG.
2 (c) and (d), a large number of pin-shaped projections 7a are projected downward on the outer peripheral edge portion, and the connecting wire net 3b and wire net 3a are superposed by the pin-shaped projections 7a. Hold in the state.

In FIG. 13 (a), the wire diameter of the wire material constituting the mesh reinforcement is 0.62 mm, the tank body and the stud bolt are made of aluminum alloy, the tank body has a capacity of 2500 m ³ , and the outer diameter of the stud bolt ( Constant) is 6.
4 mm (Cross sectional area: 32.0 mm ² , cross sectional coefficient: 25.7
mm ³⁾ when the bolt pitch is hemispherical surface 225 mm / cylinder 600mm at normal temperature (contraction filling the LNG tank at ambient temperature 30 ° C.) tank (heat shrinkage ratio of about 0.4%)
13B is a partial cross-sectional view showing the state of FIG.
It is sectional drawing which expands and shows a part (a boundary line) of (a). FIG. 14 is a schematic diagram showing the relationship between the position of the stud bolt and the bolt No. FIGS. 15A to 15C show the axial force (tensile load), bending moment and shearing force acting on the stud bolt at each position in the contracted state. FIG. 3 is a diagram showing each of the above in relation to a bolt No.

All of these are calculated by FEM analysis based on the 1/8 partial tank model. In addition,
Numerically, it is shown in the column of MOD-2 (Comparative Example) in Table 1 described later. Table 1 shows Examples 1, 2, 3 (MO of the present invention.
D-1, 3, 4) and the comparative example (MOD-2), the axial force (tensile load), bending moment, and shear force of the stud bolt arranged near the boundary line between the hemispherical surface portion 1a and the cylindrical body portion 1b. Shows each value calculated based on FEM analysis.

As is apparent from FIGS. 12 to 15 and Table 1 above, the stud bolt (No. 0 to 9) at the intermediate position in the longitudinal direction of the cylindrical body portion 1b and the stud at the center position of the hemispherical surface portion 1a. Bolt (Bolt No. 250)
To the stud bolts (bolt Nos. 100 to 116) located at these boundary positions, the bending moment and shearing force gradually increase. In other words, in a cylinder type tank that uses a support such as a stud bolt to fix the heat insulating panel to the tank body, when it is used under normal pressure and low temperature to store cryogenic substances such as LNG. Causes the tank to shrink due to heat shrinkage, and a bending moment and a shearing force are generated in a support tool such as a stud bolt, and in particular, a stud bolt (bolt No. 100- A large bending moment and shearing force act on 116).

As a result, in the tank body 1 (cylinder type tank), the stud bolts (bolt Nos. 100 to 1) located at the boundary line between the hemispherical surface portion 1a and the cylindrical body portion 1b.
The bending moment of 16) becomes the maximum, which may cause the stud bolt to break or break from the root (especially in the vicinity of the welded portion with the tank body).

The present invention has been made in view of the above point, and it is possible to reduce or eliminate a bending moment generated in a support tool such as a stud bolt due to contraction of a tank due to thermal contraction (can be set to 0). It is intended to provide a heat insulating structure for a cryogenic tank.

[0015]

In order to achieve the above object, the invention of claim 1 is characterized in that heat insulating panels having a convex cross section and a fixed shape are arranged adjacent to each other on the surface of the tank body. Attached by a support provided in the tank body, in a heat insulating structure for a cryogenic tank in which the joints are buried by filling or foaming the joints between the protrusions of the heat insulating panel with a synthetic resin material, the tank body is A hemispherical surface portion is integrally connected to both ends of the cylindrical body portion, and the supporting tool includes a bending moment suppressing structure for suppressing a bending moment generated in the supporting tool when the tank body is thermally contracted. Is characterized by.

According to this structure, the support for attaching the heat insulating panel to the tank body has the bending moment suppressing structure for suppressing the bending moment generated in the support when the tank body is thermally contracted. The maximum bending moment acting on the support located at the boundary between the hemispherical surface and the cylindrical body is significantly reduced. As a result, when the conventional support tool is a stud bolt, there is a risk of breakage or breakage from the root (particularly in the vicinity of the welded portion with the tank body), but such a risk is eliminated.

Therefore, a cryogenic tank which greatly shrinks due to heat shrinkage due to storage of a cryogenic substance, that is, a heat insulating panel having a convex cross section and made of a synthetic resin foam having an aluminum foil surface sheet material and a two-layer laminated structure inside and outside Are arranged adjacent to each other on the surface of the tank main body, are attached by a supporter planted in the tank main body, and the joints between the protrusions of the heat insulating panel are filled or foamed with a synthetic resin material. A space between the joints is buried, and the aluminum foil connecting sheet material having the same structure as the aluminum foil surface sheet material is entirely covered over the synthetic resin foam of the joint and over the aluminum foil surface sheet material around the joint. It is suitable for a cryogenic tank that is bonded and has a reinforcing wire net interposed between the inner and outer laminated portions of the two-layer laminated structure.

As described in claim 2, the support is
The lower and upper support members may be configured by wires and ropes connecting the upper and lower end portions of the lower and upper support members, and the lower end portion of the lower support member may be fixed to the tank body. it can.

In this way, by mainly using the cords excellent in flexibility and bendability, the bending moment which is about to be generated in the support tool is absorbed by the portion of the cords. . Therefore, when the tank body shrinks due to heat,
The bending moment does not act on the support.

Similarly, with a simple structure, in order to suppress a bending moment generated in the support tool when the tank main body is thermally contracted, the support tool is replaced by the cord instead of the rope. Is a flexible bolt member having a small diameter in an intermediate portion except upper and lower end portions, and a lower support member in which the lower end portion is fixed to the tank body and the lower end portion of the flexible bolt member is connected to the upper end portion. And a structure in which a connecting bolt member including an upper member and a lower member whose one ends are bendably connected is used instead of the flexible bolt member as described in claim 4. Can also be

According to a fifth aspect of the present invention, the bending moment suppressing structure is used at the boundary between the cylindrical body of the tank body and the left and right hemispherical surfaces and in the vicinity of the boundary, and the other portions are full length. It is possible to use stud bolts having the same diameter throughout.

According to this structure, the bending moment suppressing structure is used only at the boundary between the cylindrical body of the cylindrical tank and the left and right hemispherical surfaces and near the boundary,
Since the other parts can use the stud bolts used for the conventional spherical tank as a support tool, use of a bending moment suppressing structure different from the conventional structure is minimized,
The bending moment can be suppressed without impairing the construction efficiency.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an external appearance of a cryogenic cylinder type tank provided with a heat insulating structure according to the present invention with a part cut away and a left side view with the right half omitted, and FIG. FIG. 4 is an enlarged plan view showing a part of the heat insulating layer on the tank, FIG. 4 (a) is a cross-sectional view taken along the line AA of FIG. 3, and FIG. Sectional view taken along line B, FIG.
4A is a partially enlarged sectional view of FIG. 4A, and FIG.
It is a partially expanded sectional view of (b). FIG. 6A is a sectional view in which the upper portion of FIG. 5B is further enlarged, and FIG. 6B is a perspective view showing an embodiment of the heat insulating panel.

As shown in FIG. 1, the tank main body 1 is a cylindrical tank in which a cylindrical body portion 1b is arranged between hemispherical surface portions 1a, 1a located at both ends, and these are integrally provided. In this example, the tank body 1 is made of an aluminum alloy.

The tank body 1 is attached and fixed by a pair of hull side tank support members 3 at the bottom inside the hold of the LNG transport ship.
3, 3 and 34 are erected at regular intervals in the length direction, and then the tank-side support members 31 and 32 are placed on these tank support members 33 and 34. The tank main body 1 is fixed in the longitudinal direction of the tank main body 1 by a stopper having one tank side support member 31 attached to a hull side tank support member 33. The other tank-side support member 32 is slidably mounted on the tank support member 34 so as to absorb deformation in the lengthwise direction of the tank body 1 due to low-temperature heat shrinkage.

As shown in FIGS. 2 to 4, the heat insulating layer 2 covering the outer peripheral surface of the tank body 1 has a two-layer laminated structure including an inner (tank side) heat insulating laminated portion 2a and an outer heat insulating laminated portion 2b. . Between the both heat insulating laminated portions 2a and 2b, the mesh reinforcement 3
The wire net 3a is interposed and self-adhesive at the time of foaming when the synthetic resin forming the heat insulating layer is foamed, or is adhered to each other with an adhesive to be integrated.

The heat insulating layer 2 is formed by adjoining a large number of heat insulating panels 5 (see FIG. 6 (b)) having a convex cross section and a fixed shape on the outer peripheral surface of the tank body 1 and not by the conventional stud bolt method. It is fixed by a support tool 4 including a cord 4A, which is a feature of the present invention. As the cord 4A, a wire or rope having excellent flexibility and flexibility is used, and by using this, the support tool 4 is generated on the support tool 4 when the tank body 1 is thermally contracted. It is provided with a bending moment suppressing structure for suppressing a bending moment.

As shown in FIG. 5 (b), the lower end portion of the cord 4A is engaged with the distal end annular locking portion 4Ba of the lower support member 4B fixed to the tank body 1 by welding,
The upper end portion is locked to the lower end annular locking portion 4Ca of the upper support member 4C attached by the washer 7 and the nut 8.

The heat insulating panel 5 is shown in FIGS. 1 and 6 (b).
As shown in Fig. 3, the fixed shape (in this example, the cylindrical body 1b has a long side of 1.2 m × a short side of 0.9 m, and the hemispherical surface portion 1a has a long side of 0.9 m ×
Inner heat insulating laminated portion 2a (thickness 210 mm) with a convex cross section having a short side of 0.6 m (× thickness: 330 mm, this thickness can be increased or decreased depending on the required heat insulating performance).
And a convex outer heat-insulating layer portion 2b (thickness 120 mm), a wire net 3a of a plain weave wire mesh that constitutes a part of the net-like reinforcing material 3 is integrally interposed. The inner heat-insulating laminated portion 2a is selected from hard urethane resin foam reinforced with glass fiber, natural fiber, chemical fiber or the like, phenol resin foam, or the like, but in this example, it is made of phenol resin foam. The outer heat insulating layer 2b is selected from hard urethane resin foam, phenol resin foam, styrene resin foam, and the like, but in this example, it is made of polyurethane foam.

The surface of the heat insulating panel 5 is covered with an aluminum foil surface sheet material 6 (a surface sheet material made of an aluminum alloy). As shown in part in FIG. 6A, the surface sheet material 6 is mainly composed of an aluminum foil (aluminum foil) 6a having a thickness of 25 μm, and a polyethylene terephthalate (having a thickness of 100 μm) is formed on the surface of the aluminum foil 6a. PET) film 6b is laminated integrally by laminating or coating, and aluminum foil 6
Non-woven fabric 6c having a thickness of about 100 μm on the back surface (inner surface) of a
It has a structure in which the layers are integrally laminated.

As shown in FIGS. 4 (b) and 5 (b),
On the outer peripheral surface of the tank body 1, the lower end portion of the lower support member 4B having the annular locking portion 4Ba at the tip is fixedly spaced (in this example, the hemispherical surface portion 1a: 225 mm or 450 mm, the cylindrical body portion 1b: (600 mm) is opened and fixed by welding. Further, the lower end of the cord 4A is locked to the annular locking portion 4Ba of the lower support member 4B. The rope 4A has a fixed length corresponding to the inner heat-insulating laminated portion 2a, and the upper end thereof is locked to the annular locking portion 4Ca at the lower end of the upper support member 4C.

On the wire net 3a of the heat insulating panel 5, the wire net 3b for connecting the net-like reinforcing member 3 is formed.
Are arranged over the upper support member 4C.
The male screw portion 4Cb of the above penetrates the connecting wire net 3b, inserts the washer 7, and tightens with the nut 8, and the connecting wire net 3b and the wire net 3a are superposed by the washer 7 (pin-shaped projection 7a). It is held in a closed state. The mounting with the washer 7 and the nut 8 is the same as the mounting of the upper end portion of the stud bolt which is the conventional supporting tool (FIG. 12).
(See (b)).

Since the cord 4A is excellent in flexibility and flexibility, even if a bending moment is about to act when the tank body 1 is thermally contracted, it is deformed in a direction to absorb it.
As a result, no bending moment acts. Here, the cord 4A is attached to the tank body 1 via the lower support member 4B, but the lower end of the cord 4A may be directly fixed to the outer peripheral surface of the tank body 1 by welding. it can.

Outside heat insulating layer 2b of the adjacent heat insulating panel 5
In this example, a polyurethane foam is formed by filling at least one of synthetic resin materials of basically the same type as the outer heat-insulating layer portion 2b or performing foaming. 9 is filling the joint.

On the surface of this polyurethane foam 9,
As shown in FIG. 6A, the aluminum foil connecting sheet material 11 is adhered onto the outer edges of the aluminum foil surface sheet material 6 of the heat insulating panels 5 on both sides. This aluminum foil connecting sheet material 11 is a double-sided adhesive butyl rubber sheet 11a (thickness is, for example, 500 μm) which is continuously (without floating) attached on the outer edge of the aluminum foil surface sheet material 6.
And an aluminum foil (aluminum foil) 11b having a thickness of 25 μm which is entirely adhered or adhered on the rubber sheet 11a.
And a thickness 50 integrally laminated on the surface of the aluminum foil 11b by laminating or coating.
It has a laminated structure with a polyethylene terephthalate (PET) film 11c of about μm.

As described above, the heat insulating layer 2 covers the outer peripheral surface of the tank body 1 to form the heat insulating structure of this embodiment. Then, in the conventional structure, the stud bolts 21 having the same diameter (see FIG. 12B) are used as the support, but instead of this, in the present invention, the rope 4A such as a rope or a wire is used. Since the support tool 4 used is used, the bending moment does not act due to the thermal contraction of the tank, and there is no problem such as the conventional damage of the support tool 4 due to the generation of the bending moment.

MOD-1 in the following Table 1 is a numerical value showing the FEM analysis result of the embodiment of the present invention, and is shown in FIG.
(C) is a heat contraction state, and has shown the axial force, the bending moment, and the shearing force which act on the cord of each position in order with relation to bolt No (position). 8A and 8B are MOD-
FIG. 2 is a partial cross-sectional view showing a state in which the heat insulating panel in FIG.

[0039]

[Table 1] As is clear from Table 1 and FIG. 7, with the supporting tool 4 using the cord 4A, only the axial force acts, and the bending moment and the shearing force are equal to the hemispherical surface portion-cylindrical portion (cylindrical portion). It does not work over the entire area including the boundary part between and and becomes 0.

The present invention is not limited to the embodiment described above, and can be modified as follows. (1) In the above embodiment, the support tool 4 is configured by the cord 4A, the lower support member 4B, and the upper support member 4C, but instead of this, as shown in FIG.
It is also possible to use a support member that uses a bolt member having a thin intermediate portion except the upper and lower end portions.

The support 14 is composed of a lower support member 15 made of an aluminum alloy of the same quality as the tank body 1 and a flexible bolt member 16 made of stainless steel. The support member 15 is integrally formed with a female screw hole portion 15a and a root portion 15b fixed to the tank body 1 by welding. The flexible bolt member 16 has, for example, male screw portions 16a and 16b at both upper and lower ends and a male screw portion 16 at an intermediate portion.
A small-diameter portion 16c having an outer diameter smaller than that of a and 16b is provided so that the middle portion is easily bent. The lower male screw portion 16b of the flexible bolt member 16 is attached by being screwed onto the female screw portion 15a of the support member 15, and the upper male screw portion 16a is the same as a conventional stud bolt and isher 7 and nut. Attached using 8.

Regarding the wire diameter of the iron wire net 3a, the wire net 3a of the hemispherical surface portion 1a is 0.7.
0 mm, the wire diameter of the wire net 3a of the cylindrical body portion 1b is 0.62 mm, the radius of the hemispherical surface portion 1a of the tank body 1 is about 4500 mm, the length of the cylindrical body portion 1b is about 14000 mm. MO except the configuration of
The components and the fixed pitch etc. are common to D-1. The upper and lower ends of the flexible bolt member 16 (the male screw portion 1
6a, 16b) has an outer diameter of 6.0 mm and an intermediate portion (small diameter portion 1
6b) has an outer diameter of 4.0 mm or a small diameter of 4.5 mm (MOD-3, MOD-4), the axial force acting on the flexible bolt member 16 is the same as that of MOD-2 (comparative example). There is almost no change, but regarding bending moment, MO
It is further reduced as compared with D-2, and it is recognized that the bending bolt 16 has a sufficient effect of reducing the bending moment (see MOD-3 and MOD-4 in Table 1). (2) Further, as shown in FIG. 10, instead of the flexible bolt member 16, a bolt member 17 including an upper member 17A having hook portions 17Aa and 17Ba and a lower member 17B may be used. It is possible. In this case, the hook portions 17Aa and 17Ba are coupled to each other so as to be rotatable relative to each other, and the members 17A and 17B are coupled as if they were universal joints. The attachment of the male screw portions 17Ab and 17Bb of the upper member 17A and the lower member 17B is the same as in the case of the flexible bolt member 16. (3) In the above-described embodiment, the support tool (bending moment suppressing structure) using the rope is applied to all the support tools, but the present invention is not limited to this, and A support member is used at the boundary between the cylindrical body of the tank body and the left and right hemispherical surfaces where the bending moment that acts particularly increases, and in the vicinity of the boundary, and other portions have the same diameter over the entire length. It is also possible to use (conventional supports). (4) The cryogenic tank to which the present invention is applied is mainly a cylindrical tank in which a hemispherical portion is integrally connected to both ends of a cylindrical body, but is applicable as long as it has a curvature such as a sphere. Not only those installed on the ground but also those installed on ships, for example.

[0043]

As is apparent from the above description,
The heat insulating structure for a cryogenic tank of the present invention has the following excellent effects.

According to the invention of claim 1, the support for attaching the heat insulating panel to the tank body is provided with a bending moment suppressing structure for suppressing a bending moment generated in the support when the tank body is thermally contracted. The maximum bending moment that has been conventionally generated in the support located at the boundary between the hemispherical surface portion and the cylindrical body can be significantly reduced. Therefore, when the support tool is a stud bolt in the related art, there is a possibility that the root (particularly in the vicinity of the welded portion with the tank body) may be broken or broken, but this can be avoided.

According to a second aspect, the support is
If the lower and upper support members and the ropes such as wires and ropes that connect the upper and lower ends of the support members are used, the bending moments can be absorbed by the ropes, and when the tank body thermally contracts. The bending moment does not act on the support.

Further, as described in claim 3, in place of the rope, the support is provided with a flexible bolt member having a thin intermediate portion excluding upper and lower end portions, and a lower end portion on the tank body. And a lower side support member to which the lower end portion of the flexible bolt member is connected at the upper end portion thereof, or, in place of the flexible bolt member, as shown in claim 4, By using a connecting bolt member composed of an upper member and a lower member whose one ends are freely connected, it is possible to suppress the bending moment generated in the support when the tank body is thermally contracted with a simple structure.

According to a fifth aspect of the present invention, the bending moment suppressing structure is used at the boundary between the cylindrical body of the tank body and the left and right hemispherical surfaces and in the vicinity of the boundary, and the other portions are full length. If stud bolts having the same diameter are used throughout, the use of a bending moment suppressing structure different from the conventional structure can be minimized, and the bending moment can be suppressed without impairing the construction efficiency.

[Brief description of drawings]

FIG. 1 is a front view showing the appearance of a cryogenic cylinder type tank having a heat insulating structure according to the present invention with a part cut away, and a left side view with the right half omitted.

FIG. 2 is a central longitudinal sectional view showing an outline of the tank of FIG.

FIG. 3 is a plan view showing a part of a heat insulating layer on the tank of FIG. 1 in an enlarged manner.

4 (a) is a sectional view taken along line AA of FIG. 3, and FIG. 4 (b) is a sectional view taken along line BB of FIG.

5 (a) is a partially enlarged sectional view of FIG. 4 (a), FIG.
FIG. 4B is a partially enlarged sectional view of FIG.

FIG. 6 (a) is a sectional view in which the upper portion of FIG. 5 (b) is further enlarged, and FIG. 6 (b) is a perspective view showing an embodiment of a heat insulating panel.

7A to 7C are MOD-1s in Table 1.
Axial force, bending moment, and shearing force acting on the support at each position of the tank in the heat contraction state of (Example 1) are applied to the bolt N.
It is a diagram showing in order in relation to o (position).

8 (a) and 8 (b) are a partial cross-sectional view and a partially enlarged cross-sectional view showing a deformed state in which the heat insulating panel in MOD-1 (Example 1) is thermally shrunk from the normal state.

FIG. 9 is a front view of essential parts showing another embodiment of the present invention.

FIG. 10 is a main part front view showing still another embodiment of the present invention.

FIG. 11 is a cross-sectional view showing the normal state of the spherical tank and the time of thermal contraction.

FIG. 12 (a) is a cross-sectional view showing a normal state of a cylinder type tank and a state of thermal contraction, FIG. 12 (b) is an explanatory view of a conventional stud bolt mounting state, and FIG. 12 (c) is a washer. A plan view, the left half of FIG. 12D is the same front view, and the right half is the same sectional view.

13A and 13B are MOD-2 (comparative example).
FIG. 3 is a partial cross-sectional view showing a deformed state in which the heat insulating panel in FIG.

FIG. 14 is a schematic diagram showing the relationship between the position of a stud bolt and a bolt No. in a cylinder type tank in a 1/8 partial model.

15 (a) to 15 (c) are MODs in Table 1.
2 is a diagram sequentially showing the axial force, the bending moment, and the shearing force acting on the stud bolt at each position of the tank in the heat contraction state of -2 (Comparative Example) in relation to the bolt No (position).

[Explanation of symbols]

1 tank body 1a hemisphere 1b Cylindrical body (cylindrical part) 2 heat shield 2a Inner heat insulating laminated part 2b Outer heat-insulating laminate 3 mesh reinforcement 4,14 Support 4A rope 4B Lower support member 4C Upper support member 5 heat insulation panel 15 Lower support member 16 bolt members 17 bolt members 17A Upper member 17Aa Hook part 17Ab male thread 17B Lower member 17Ba hook part 17Bb male thread

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshio Shido             3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo             No. Kawasaki Heavy Industries, Ltd.Kobe factory F-term (reference) 3E070 AA03 AA04 AB31 AB32 DA01                       NA01 NA02 NA07 VA07                 3E073 AA01 AA03 CA01 CA02 CC02                       CD08 CD12

Claims (5)

[Claims] 1. A heat insulating panel having a convex cross section and a fixed shape is arranged adjacent to each other on a surface of a tank body, and is attached by a supporting member provided on the tank body, and joints between protrusions of the heat insulating panel. In a heat insulating structure for a cryogenic tank in which a space between joints is filled by filling or foaming a synthetic resin material into the joint body, the tank body is formed by integrally connecting a hemispherical surface portion to both ends of a cylindrical body portion, Is a heat insulating structure for a cryogenic tank, comprising a bending moment suppressing structure for suppressing a bending moment generated in the support when the tank body is thermally contracted. 2. The support is composed of lower and upper support members and a wire such as a wire or a rope connecting the upper and lower end portions of the lower and upper support members, and the lower end portion of the lower support member is the tank body. The heat insulating structure for a cryogenic tank according to claim 1, which is fixed to the. 3. The support tool includes a flexible bolt member having a small diameter in an intermediate portion except upper and lower end portions, and a lower end portion fixed to the tank body and an upper end portion of the lower end portion of the flexible bolt member. The heat insulating structure for a cryogenic tank according to claim 2, further comprising: a lower support member to which is connected. 4. The heat insulating structure for a cryogenic tank according to claim 3, wherein instead of the flexible bolt member, a connecting bolt member including an upper member and a lower member whose one ends are bendably connected is used. 5. The bending moment suppressing structure is used at a boundary portion between the cylindrical body portion of the tank body and the left and right hemispherical surface portions and a portion near the boundary portion, and the other portions are provided with stud bolts having the same diameter over the entire length. Claim 1 to use
The heat insulating structure for a cryogenic tank according to any one of 4 above.