JPH11278584A - Inner tank support structure for double-shell storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve thermal insulation, durability and earthquake-proofness for an inner tank support structure by a method wherein a fabricated support member is installed at the bottom at the inside of an outer tank, and bottom parts of the outer and inner tanks are supported with the fabricated support member. SOLUTION: A fabricated support member 10 is installed at the inner bottom part of an outer tank 2. The fabricated support member 10 is made up of thermal insulating reinforced members in order to insulate conduction of the cold from liquid stored in an inner tank 4 and to insulate conduction of intense heat from the outside while bearing the weight of the inner tank 4 and the weight of the stored liquid with the bottom of the inner tank 4 being supported. The fabricated support member 10 is also made up in a three-dimensional framelike structure having wide spaces allowing heat insulating materials to pass through so that uniform formation of a heat-insulating layer 3 formed by filling heat-insulating materials is not obstructed. The fabricated support member 10 formed of the heat insulating materials does not conduct the cold of low-temperature storage liquid from the inner tank 4 and also does not conduct high temperature of the outside air from the outer tank 2 and because of this, thermal conductance between the inner and the outer tanks becomes small and thereby short-pass of heat is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner tank support structure for a double shell storage tank for storing a low-temperature liquid, a low-temperature high-pressure gas, a low-temperature liquefied gas, and the like.

[0002]

2. Description of the Related Art A heat insulating material is filled between an inner tank and an outer tank provided separately from each other to form a cooling layer, and an inner tank for storing a low-temperature liquid or the like is supported by the outer tank. Double shell storage tanks that support the outer tank with supporting legs erected on the ground foundation include various types such as a double shell spherical storage tank, a vertical double shell cylindrical storage tank, and a horizontal double shell cylindrical storage tank. There is a double shell storage tank.

A conventional example of the above-mentioned inner shell support structure of the double shell storage tank will be described with reference to FIGS. 5 (a), 5 (b) and 5 (c), taking the case of the inner shell support structure of the double shell spherical storage tank as an example. . The double-shell spherical storage tank 1 includes a single shell of a spherical plate-shaped outer tank 2, a cooling layer 3 inside the outer tank 2, and a spherical plate-shaped inner tank 4 provided inside the cooling layer 3. It is formed in combination with a single shell. A low-temperature liquid or the like is stored inside the inner tank 4, and a granular heat insulating material such as perlite, a foam heat insulating material such as foamed plastics, a soft heat insulating material such as soft urethane, and a hard heat insulating material such as hard urethane are stored inside the cold insulating layer 3. Material, fibrous heat insulating material such as glass wool.

[0004] The inner tank 4 is connected to and supported by the outer tank 2 by supporting members 7, 8, 9 penetrating through the cold insulating layer 3.
The lower part of the ground 5 is supported by supporting legs 6A, 6B and 6C.
Supported by The support member 7 in FIG.
Is formed to be suspended from the outer tub 2, and the outer tub 2 is supported from the foundation 5 by a plurality of pipe-shaped support legs 6 </ b> A. The support member 8 shown in FIG. 5 (b) is formed in a structure that directly supports the inner tank 4 and the outer tank 2, and is supported from the foundation 5 by the cylindrical plate skirt-like support legs 6B. FIG.
The support member 9 shown in FIG. 3C is formed to have a structure in which the inner tank 4 is engaged with and supported by the outer tank 2, and the outer tank 2 has cylindrical skirt-shaped support legs 6.
Supported from foundation 5 by C.

[0005] As another conventional example of the inner shell supporting structure of the double shell storage tank, there is known a structure in which an inner tank of a horizontal double shell cylindrical storage tank is supported by an outer tank via wood. In the support structure made of wood, a wood having a high heat insulating effect is provided between the inner and outer tanks at intervals, and the inner tank is installed on the wood. The support structure made of wood has a block shape in which flat materials are stacked or a substantially block shape in which many flat materials are combined.

[0006]

As described above, the supporting structure of the inner tank 4 of the double-shell spherical storage tank 1 is constituted by the supporting member 7 penetrating through the cooling layer 3 between the outer tank 2 and the inner tank 4. , 8, and 9 are formed of a material having high heat conductivity such as steel,
Is fixed to the outer wall surface of the inner tank 4 and the inner wall surface of the outer tank 2, respectively, so that cold heat from the low-temperature liquid in the inner tank 4 is transmitted to the outside, or high heat from the outside is transmitted to the low-temperature liquid in the inner tank 4, In some cases, a short heat path was generated and sufficient heat insulating performance was not obtained. For example, the heat transfer coefficient of a steel material is about 500 to 1500 times larger than the heat transfer coefficient of a heat insulating material.

Further, since the support members 7, 8, 9 are fixedly connected to the outer wall surface of the inner tank 4 and the inner wall surface of the outer tank 2 at a small number of support points, the weight is applied to the fixed support portion, and the bending load is increased. Was likely to occur, and there was a fear of deformation or breakage. Also,
Since the number of connection points with the support legs 6A, 6B, and 6C is small, the connection point is concentrated on the connection point having a small weight, and a bending load is easily generated. When a large load is applied to the support points of the inner tank 4 and the support points of the outer tank 2 due to an earthquake, strong wind, or the like,
There was a risk of deformation and damage.

In the conventional structure in which the inner tank of the above-mentioned horizontally placed double-shell cylindrical storage tank is supported by using wood, although the wood has a high heat insulating effect, the heat transfer coefficient of the wood is such as perlite. About 5 times to 1 times as compared to granular heat insulating materials, foamed heat insulating materials such as foamed plastics, and heat insulating materials such as urethane.
Since the heat transfer coefficient is about 0 times larger, the amount of heat transfer may increase. In addition, since the support structure made of wood has a block body in which flat materials are stacked or a substantially block body shape in which a large number of flat materials are combined, a small space portion is formed, and the space portion becomes a closed space. In addition, the heat insulating material could not be uniformly filled. In addition, although the support material of the block body and the substantially block body has a rigid structure, the inner tub is susceptible to large vibrations because vibrations such as seismic motion are transmitted without being attenuated. In addition, if a solid block body or a substantially block body supports cracks, if the fracture occurs, the crack tip is sharp like a wedge, and the cracks easily propagate and propagate, and as a result, the whole May cause damage.

The present invention has been made in view of the above-mentioned problems of the prior art, and has improved heat insulation and durability of an inner tank support structure, and improved seismic resistance of a seismic isolation structure. An object of the present invention is to provide an inner tank support structure for a double shell storage tank.

[0010]

An inner tank support structure for a double shell storage tank according to the present invention is provided by filling a heat insulating material having heat insulating properties between an inner tank and an outer tank provided separately from each other. A double-shell storage tank in which a cold storage layer is formed, an inner tank for storing a low-temperature liquid is supported by an outer tank, and the outer tank is supported by support legs installed on a foundation. In order not to hinder the formation of the layer, an assembling support member is formed in a frame-like structure with a strength member having heat insulation, and this assembling support member is installed on the bottom of the outer tank, and It is formed so as to support the bottom of the inner tank.

Further, the assembly supporting member is formed by placing the upper part in surface contact with the outer wall surface of the inner tank bottom and the lower part in surface contact with the inner wall surface of the outer tank bottom, without placing it on the inner and outer tank wall surfaces. It was done.

[0012] The inner shell support structure of the double shell storage tank includes:
A heat insulating insulating member is provided on the side or upper part of the cold insulation layer formed between the inner and outer tanks, and the insulating member is formed by being hung on the inner and outer tank walls without being fixed thereto.

Further, the inner tank supporting structure of the double shell storage tank is as follows:
The assembly support member is provided with an elastic seismic isolation material, or the separation member is provided with an elastic seismic isolation material to form a seismically isolated inner tank support structure with a seismic isolation structure. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An inner tank support structure of a double shell storage tank according to the present invention will be described with reference to FIGS. 1 to 4 showing the structure of a support member of the inner tank by taking a double shell spherical storage tank as an example. I do. However, the present invention is not limited to the double-shell spherical storage tank, and various types of double-shell storage tanks such as a double-shell storage tank having a structure in which the inner tank is supported by the outer tank via a cold-retaining layer, for example, a vertically placed double-shell cylindrical storage tank. Applied to

As shown in FIG. 1, a double-shell spherical storage tank 1
Is provided with an inner tank 4 for storing a low-temperature liquid or the like therein, an outer tank 2 concentrically spaced around the inner tank 4, and a cooling layer 3 filled with a heat insulating material between the inner and outer tanks. The outer tub 2 is supported by support legs 6 installed on the foundation 5.

An assembling support member 10 is installed at the bottom of the cold insulation layer 3 between the inner and outer tanks, that is, at the inner bottom of the outer tank 2. The assembly support member 10 supports the bottom of the inner tank 4 to withstand the weight of the inner tank 4 and the weight of the stored liquid, and also blocks the transmission of cold heat of the stored liquid inside the inner tank 4 and the transmission of high heat from the outside. In order to cut off the heat, a strength member having a heat insulating property is used. The assembly support member 10 is assembled in a three-dimensional frame shape having a wide interval through which the heat insulating material can pass so as not to hinder the uniform filling of the cold storage tank 3 formed by filling the heat insulating material. Form.

The assembling support member 10 is made of a material such as wood such as oak or cork, a foamed glass material or a foamed concrete material having a hardened surface, and has a rectangular shape. A member such as a rod-shaped material or a formed material, a pipe material, a round bar material, or a flat plate material is used.
These strength members are made non-combustible, processed into a composite or laminated material by press bonding or heat welding, curved formed by hot press processing, etc., bonded, assembled, bolted, etc. to the frame, or the frame and the flat plate Are assembled into a panel body or the like, and these frames and panel bodies are assembled into a three-dimensional and lightweight structure.

As shown in an enlarged manner in FIG.
The assembling support member 10 is formed in annular bodies 13 and 14 having a central portion vertically separated, and a plurality of standing pillars 15 are provided therebetween.
The ring members 16 and 17 are provided at equidistant positions further outside the ring members 13 and 14, and the ring members 13 and 1 are connected to each other.
6, and multiple radial skeletons 1 to pass between 14 and 17
8 and 19 are provided. Upper surfaces of annular bodies 13 and 16 and skeleton 1
8 is curved so as to match the outer wall curvature of the bottom of the inner tank 4, and the lower surfaces of the annular bodies 14 and 17 and the lower surface of the skeleton 19 are curved so as to match the inner wall curvature of the bottom of the outer tank 2. Then, each contact surface is formed so as to make surface contact with a large area. The plurality of pillars 15 located near the lower center of the inner tank 4 are vertically arranged so as to support the weight of the storage liquid and the inner tank 4, and the pillars 15 located on the outer lower side surface thereof.
Are formed along the axis of the ball so as to support a horizontal load. Further, by providing the diagonal members between the frames, a structure that is more resistant to twisting, bending, and buckling can be obtained. Assembly support member 10 having the above structure
Can be easily and easily assembled and formed according to the curved wall shape.

The assembling support member 10 made of a material having heat insulating properties does not transmit the cold heat of the low-temperature storage liquid from the inner tank 4 and does not transmit the high heat of the outside air from the outer tank 2. Therefore, the amount of heat transfer between the inner and outer tanks is small, so that a short path of heat can be prevented. When the above-mentioned heat-insulating strength member is used, its heat transfer coefficient is as small as about 1/500 to 1/500 as compared with the case where it is joined with a conventional steel material, and is smaller than the case where it is supported with a conventional wood. Is also as small as about 1/5 to 1/10, so that the amount of heat transfer can be greatly reduced.

Further, as compared with the case of using a block-like or substantially block-like wood supporting material, the space between the frames of the assembly supporting member 10 has a large space and can be filled with a heat insulating material, so that the amount of heat transfer is reduced. be able to. In addition, since the heat insulating material does not have uneven portions, offset portions, spaces, etc., and the heat insulating material is uniformly filled between the frames, the heat insulating layer 3 can be insulated even if the assembly supporting member 10 is present. The performance is not impaired, and the cool insulation layer 3 with good cool keeping performance is obtained. In addition, if a packing material having better heat insulation performance than the above-mentioned frame and panel body is sandwiched between the assembly joints of the frame support member 10 and assembled, the heat insulation performance of the assembly support member 10 can be further enhanced.

When a granular heat insulating material such as perlite is used as the heat insulating material, it is easy to uniformly fill every corner between the frames, and when the granular heat insulating material is replaced during maintenance, Since the granular heat insulating material can freely move between the frames, it can be easily extracted. In addition, when using foam insulation such as urethane foam or foam concrete to be filled by foaming at the site, the foam insulation can reach even the details between the frames and uniform filling work can be performed. There is no need to wait for the upper inner tank construction until the strength is obtained, and the upper inner tank construction can be performed immediately while the inner tank load is supported by the frame, so that the construction period can be shortened. In addition, when a block-shaped solid insulation material is used, the solid insulation material can be uniformly applied after filling the insulation material such as glass wool between the frames, and during use, the solid insulation material can be compacted or biased. Since it does not occur, the cooling performance can be stably maintained for a long period of time.

Further, since the vibration transmitting cross section of the assembly supporting member 10 is small, the oscillation can be attenuated. In other words, the plurality of columns 15 have a predetermined rigidity so as to support the weight of the storage liquid and the inner tank 4, and at the same time, transmit the stress to the bending load caused by the sway between the inner and outer tanks. Since it is dispersed at the inner surface and escapes, it flexibly responds to twisting and bending and has durability. The assembling support member 10 including at least a plurality of columns of vertical members and a plurality of beams of horizontal members is less likely to be totally damaged even if some of the vertical members or horizontal members are damaged. Is also safe.

Further, the assembly support member 10 aligns the vertical axis of the curved inner and outer tanks with the vertical axis of the assembly support member 10, and does not adhere to the inner wall surface of the bottom of the outer tank 2, and
It is placed at the center of the bottom between the inner and outer tanks so that the weight of the inner tank 4 and the weight of the stored liquid in the inner tank 4 are supported evenly without being fixed to the bottom outer wall surface. As described above, the assembly support member 10 placed at the center of the bottom between the curved inner and outer tanks is hardly displaced from the center position, and has a good stability because it has a structure that returns to the original position even if it moves. In addition, the inner wall of the outer tank 2 and the inner tank 4
Since the assembly support member 10 is not fixed to the outer wall surface, when the inner and outer tanks fluctuate due to shaking or vibration due to an earthquake or strong wind, or a change in the storage solution, the displacement of the contact portion is not restricted, and No deformation or damage occurs even when a load is applied.

The assembling support member 10 is formed in a seismic isolation structure by providing a seismic isolation member 12A formed of elastic cushioning members 20, 21. The contact surface between the assembly support member 10 and the inner tank 4, that is, the upper surfaces of the annular bodies 13 and 16 and the upper surface of the skeleton 18 are provided with a material that withstands the extremely low temperature transmitted from the low-temperature storage liquid and has heat insulation and elasticity, for example, glass wool. A cushioning member 20 such as or asbestos is provided. Also, the assembly support member 10
The contact surface of the outer tub 2 and the lower surfaces of the annular bodies 14 and 17 and the lower surface of the frame 19 are provided with a low-temperature property, a cushioning member 21 made of a material having heat insulation and elasticity, for example, silicone rubber or synthetic resin material. Is provided. The seismic isolation material 12A formed by the buffer members 20 and 21 conforms to the curvature shape of the inner and outer tanks, so that it serves as a packing material to fill the gap between the assembly support member 10 and the inner and outer tank wall surfaces, thereby enhancing refrigeration by preventing convection. At the same time, it is possible to absorb vibrations and displacements and transmit a load on average. Therefore, seismic isolation against shaking or vibration due to an earthquake or strong wind is obtained, and the durability and safety are further improved.

As described above, the cushioning members 20 and 21 having excellent heat insulating properties are provided on the contact surface between the assembly supporting member 10 and the inner and outer tank wall surfaces. Does not necessarily use a member having heat insulating properties, but uses a member such as a steel material having high rigidity and good low-temperature characteristics. By using such a member having high rigidity strength, the columns and beams constituting the assembly support member 10 can be made thinner, and can be easily and easily assembled and formed by welding or screwing. .

When a seismic isolation member (not shown) such as laminated rubber is incorporated in the middle of the vertical column 15 of the assembly support member 10 to form a seismic isolation structure, absorption of horizontal displacement and absorption of vibration energy are achieved. Absorption can be further increased. Also,
Although not shown, if a coil spring or a leaf spring is provided in the vertical direction between the frames of the assembly support portion so as to absorb and relax vertical displacement and vibration energy, seismic isolation against vertical load can also be obtained. . These structures with enhanced seismic performance are suitable for areas where there is a lot of vibration or where the ground is soft.

As shown in FIG. 1, a predetermined distance between the inner tub 4 and the outer tub 2 in the lateral or upper direction is maintained between the inner tub and the outer tub in the side or upper part of the cold insulation layer 3. In order to block the conduction of cold heat inside the tank 4 and the conduction of high heat from the outside of the outer tank 2, a separating member 11 having rigidity and heat insulation properties.
Is provided.

Referring to FIG. 3, a description will be given of the separating member 11 provided on the side or upper part of the cold insulation layer 3 between the inner and outer tanks. In the illustrated example, a separating member 11 that maintains a predetermined distance between the inner tank 4 and the outer tank 2 in a lateral direction or an upward direction is formed by using a member having rigidity and heat insulating properties, such as wood and a heat insulating composite material. , A case where it is formed by a rod-shaped connecting member 22 is shown. Alternatively, though not shown, a frame body assembled so that the heat insulating material passes between the frames to facilitate filling, or a flat frame body provided with a through hole through which the heat insulating material can pass and easy to fill, or these frame bodies Are formed in a panel frame or the like obtained by combining. This connecting member 2 having heat insulation properties
By 2, heat conduction between the inner and outer tanks is cut off, so that a short-circuit of heat does not occur through the separating member 11. Further, as described above, even if there is the separating member 11 in the cold insulating layer 3, since the filling of the heat insulating material is not hindered, the space and the uneven portion of the heat insulating material do not occur in the cold insulating layer 3, The cold insulation layer 3 excellent in heat insulation performance can be formed.

The separating member 11 is not fixed to the inner and outer tank wall surfaces, but is mounted on, for example, a mounting bracket 24A fixed to the outer wall surface of the inner tank 4 and a mounting bracket 24B fixed to the inner wall surface of the outer tank 2. Then, it is movably suspended within a predetermined distance in a lateral direction or an upward direction by a long hole loose fitting stopper, an insertion guide structure or the like (not shown). As described above, since the separating member 11 is movably mounted without being fixed to the inner and outer tank wall surfaces, it follows the displacement without restricting the lateral or upward movement of the inner and outer tanks with each other, and the inner and outer tank wall mounting. No deformation or damage to the part.

At the tip of the connecting member 22, cushioning members 23A and 23B made of glass wool, asbestos, foam material, composite material, synthetic rubber, or the like, having low temperature resistance and good low temperature characteristics, and having heat insulation and elasticity. The seismic isolation material 12B is provided to form a seismic structure that elastically moves and absorbs vibration and impact. Thus, the seismic isolation member 12 provided on the separating member 11
By B, the lateral or upward displacement of the inner and outer tubs is elastically absorbed and alleviated, so that the quake-resistant structure is more secure against shaking or vertical vibration due to an earthquake or wind.

Another embodiment of the assembly support member 10 will be described with reference to FIG. This assembly support member 10
Is a strength member with excellent heat insulation and support, rigidity, for example,
Use a flat plate made of wood, fiber reinforced glass, foamed glass, foamed concrete, or the like. These members are processed into composite or laminated plywood by pressing or heating,
It is curved and formed by hot pressing, etc., and is assembled into a panel frame by bonding, assembling, or bolting. As shown in FIG. 4, this assembly support member 10 is provided with, for example, an annular flat plate 25 having the same plate width on the side, and connecting its lower bottom with a plurality of assembled plates 27 having the same plate width. To form a frame that matches the spacing of. Also, the assembly support member 10
The annular flat plate 25 is provided with a plurality of substantially circular through holes 28, and the assembled plate 27 of the assembly support member 10 is provided with a plurality of substantially circular through holes 29.

The assembling and supporting member 10 using a flat plate as described above can be easily manufactured because the end of the flat plate is curved and cut to conform to the curved wall shape of the inner and outer tanks. Further, when a curved plate or the like (not shown) pressed in accordance with the curvature of the inner and outer tank contact wall surfaces is attached to the upper or lower contact portion of the assembly support member 10, the contact area becomes large and the load becomes large. Is received on average, so that the structure has good stability.

The assembling support member 10 provided with the through holes 28 and 29 passes through the through holes 28 and 29 and is uniformly filled with the heat insulating material between the frames. Is filled, so that there is no fear of causing a non-uniform portion, a biased portion, a space portion, and the like of the heat insulating material in the cold storage tank 3, and a good cold storage performance can be obtained.

As described above, the substantially circular through-hole 2 is formed in the flat plate material.
The assembling support member 10 provided with 8, 29 retains a predetermined rigidity and disperses the bending load at the curved inner end portions of the substantially circular through holes 28, 29 against the bending load. To escape, stress propagation does not concentrate on one point,
It absorbs and reduces twists and flexures and provides durability. Also,
Since the substantially circular through holes 28 and 29 have a function of stopping crack propagation, the structure has an excellent function of stopping crack propagation.

[0035]

As is clear from the above description, the inner tank support structure of the double-shell storage tank according to the present invention is formed by assembling and assembling a frame-like structure with a heat-insulating strength member. In addition, the amount of heat transmitted through the assembly support member is small, so that a short path of heat between the inner and outer tanks is prevented, and good cooling performance can be maintained.

Further, the assembling support member assembled into the frame-like structure is installed on the inner bottom of the outer tank, and is formed so as to support the bottom of the inner tank with this assembling support member. There is a lot of space between them, and the insulation can be filled well. Therefore,
When the heat insulating material is filled into the cold insulation layer on which the assembly support member is installed, the heat insulating material does not have uneven portions, offset portions, and space portions. Further, since the heat insulating material is uniformly filled between the frames, the heat insulating performance is not impaired even with the assembly support member, and a cold insulating layer having a good cold insulating performance can be obtained.

The assembling and supporting member has a predetermined rigidity so as to support the weight of the storage liquid and the inner tank by a plurality of upright columns, and also has a stress against a bending load caused by the mutual shaking of the inner and outer tanks. The propagation is dispersed at the inner surface of the frame-shaped opening and escapes, and the torsion and deflection are flexibly absorbed and alleviated.
The durability against vibration and shaking such as earthquakes and strong winds is improved. Further, since the assembled frame has a small vibration transmission cross section, the oscillation can be damped. The assembly support member consisting of at least a plurality of columns of vertical members and a plurality of beams of horizontal members, even if some of the vertical members or horizontal members are damaged, is unlikely to be totally damaged, so that it has a better structure than the conventional structure. It is safe. In the case of an assembly support member having a substantially circular through hole in a flat plate, the bending load is dispersed and released at the curved inner end of the substantially circular through hole, so that stress propagation does not concentrate at one point. It is easy to absorb and relax torsion and deflection, and durability is obtained. Further, since the substantially circular through-hole has a function of stopping crack propagation, the structure has an excellent function of stopping crack propagation.

The assembling / supporting member is made of wood such as oak or cork, foamed glass material or foamed concrete material having a hardened surface, a member made of a rectangular material or a molded material in a rod shape, a pipe material or a round bar material. Or, using a member such as a flat plate,
These strength members are made non-combustible, processed into a composite material or laminated material by press bonding or heat bonding, formed into a curved shape by hot pressing, etc., and assembled into a three-dimensional frame by bonding, assembling, bolting, etc. Therefore, it is excellent in supporting force, rigidity and durability, and is reduced in weight, and can be manufactured easily and easily.

The assembly support member is formed in a shape conforming to the curved surface shape of the inner and outer tanks, such that the upper part is in surface contact with the outer wall surface of the inner tank bottom and the lower part is in surface contact with the inner wall surface of the outer tank bottom. And, since it is placed without being fixed to the inner and outer tank wall surface, the center position is hard to shift at the bottom between the curved inner and outer tanks, and even if it moves, it returns to the original position because it is a structure Good stability. In addition, since the inner and outer tanks follow the displacement without restraining the mutual movement and do not deform or damage the abutting part, the load applied to the wall abutting part due to earthquake, strong wind, changes in the storage solution, etc. The safety is improved.

Further, a heat insulating insulating member is provided on the side or upper part between the inner and outer tanks, and the insulating member is suspended from the inner and outer tank wall without being fixed to the inner tank supporting structure. Since the amount of heat transmitted through the contact member is small, there is little short path of heat to the side or upper part between the inner and outer tanks, and good cooling performance is maintained, and displacement between the inner and outer tanks without restricting the lateral and upward movement. Therefore, the contact portion is not deformed or damaged, so that the safety against a lateral or upward load applied by an earthquake, a strong wind, a change in the storage liquid, or the like is further improved.

Further, an elastic seismic material having elasticity is provided on the assembly supporting member, or an elastic seismic material having elasticity is provided on the separating member, so that the seismic isolation structure of the double shell storage tank having seismic resistance is provided. In the inner tank support structure, the elastic seismic isolation material conforms to the curvature shape of the inner and outer tanks and becomes a packing material that fills the gap between the inner and outer tank walls, absorbing vibration and displacement and transmitting the load averagely. As a result, seismic isolation against shaking and vibration due to an earthquake or strong wind is obtained, and durability and safety are further improved.

[0042]

[Brief description of the drawings]

FIG. 1 is an explanatory side sectional view showing an assembly support member provided between inner and outer tanks of a double-shell spherical storage tank and a separating member in an embodiment of an inner tank support structure of a double-shell storage tank according to the present invention. is there.

FIG. 2 is a perspective explanatory view showing an example of an embodiment of an assembly support member provided at a bottom portion between the inner and outer tanks, with a part thereof being omitted;

FIG. 3 is a perspective explanatory view showing an example of an embodiment of a separating member provided on a side part or an upper part in a cold insulating layer formed between an inner and outer tanks.

FIG. 4 is a perspective explanatory view showing another embodiment of the assembly support member provided at the bottom between the inner and outer tanks.

5 (a), 5 (b) and 5 (c) are side sectional explanatory views showing a conventional inner shell support structure of a double shell storage tank.

[Explanation of symbols]

Reference Signs List 1 spherical storage tank 2 outer tank 3 cold storage layer 4 inner tank 5 foundation 6, 6A, 6B,
6C Support leg 7, 8, 9 Support member 10 Assembly support member 11 Separation member 12, 12A, 1
2B Seismic isolation material 13,14 Ring body 15 Column 16,17 Ring body 18,19 Frame 20,21 Buffer member 22 Communication member 23A, 23B Buffer member 24A, 24B
Mounting bracket 25 Annular flat plate 27 Assembly plate 28, 29 Through hole

Claims (4)

[Claims] 1. A heat insulating material is filled between an inner tank and an outer tank provided apart from each other to form a cool layer, and the inner tank for storing a low-temperature liquid is supported by the outer tank. A double shell storage tank supporting the outer tank with supporting legs installed on a foundation, and a frame member formed of a heat-insulating strength member so as not to hinder the formation of a cold insulation layer by the heat insulating material. The assembly support member is formed in the shape of a cross section, the assembly support member is installed on the bottom of the outer tank, and the assembly support member is formed to support the bottom of the inner tank. Inner tank support structure for shell storage tank. 2. The assembly support member is formed by placing the upper part in surface contact with the inner wall surface of the inner tank bottom and the lower part in surface contact with the inner wall surface of the outer tank bottom without being fixed to the inner and outer tank wall surfaces. The support structure for an inner tank of a double-shell storage tank according to claim 1, wherein: 3. An insulating member having heat insulating properties is provided on the side or upper portion of the cold insulation layer formed between the inner and outer tanks, and the insulating member is formed by being suspended without being fixed to the inner and outer tank wall surfaces. An inner tank support structure for a double shell storage tank according to claim 1 or 2, wherein: 4. A seismic isolation material having elasticity is provided on the assembly support member, or an elastic seismic material is provided on the separating member to provide an inner tank support structure having seismic resistance in a seismic isolation structure. 4. An inner tank support structure for a double-shell storage tank according to claim 1, wherein the inner shell support structure is formed.