JP4431842B2 - Inner tank support structure of double shell spherical storage tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner tank support structure for a double-shell spherical storage tank that stores a low-temperature liquid, a low-temperature high-pressure gas, a low-temperature liquefied gas, and the like.
[0002]
[Prior art]
A heat insulating material is filled between the inner tub and the outer tub that are spaced apart from each other to form a cold insulation layer, and the inner tub that stores cryogenic liquid is supported by the outer tub, The double-shell storage tanks that support the outer tank with support legs standing upright are various double-shell storage tanks 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.
[0003]
A conventional example of the inner shell support structure of the double shell storage tank will be described with reference to FIGS. 5A, 5B, and 5C, taking the inner tank support structure of the double shell spherical storage tank as an example. The double-shell spherical storage tank 1 is composed of a single shell of a spherical plate-shaped outer tank 2, a cold insulating layer 3 inside the outer tank 2, and a spherical plate-shaped inner tank 4 provided inside the cold insulating layer 3. It is formed by combining 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 pearlite, a foam heat insulating material such as foamed plastics, a soft heat insulating material such as soft urethane, or a hard heat insulating material such as hard urethane. Filled with material, fibrous insulation such as glass wool.
[0004]
The inner tub 4 is connected to and supported by the outer tub 2 by support members 7, 8, and 9 penetrating the cold insulation layer 3, and the lower portion of the outer tub 2 is supported from the ground foundation 5 by the support legs 6A, 6B, and 6C. Has been. The support member 7 of FIG. 5A is formed in a structure that supports the inner tank 4 suspended from the outer tank 2, and the outer tank 2 is supported from the foundation 5 by a plurality of spaced pipe-shaped support legs 6A. The support member 8 in FIG. 5B is formed in a structure that directly supports the inner tub 4 and the outer tub 2, and is supported from the foundation 5 by the cylindrical leg skirt-like support legs 6B. The support member 9 shown in FIG. 5 (c) is formed in a structure for engaging and supporting the inner tub 4 with the outer tub 2. The outer tub 2 is supported from the foundation 5 by a cylindrical plate skirt-like support leg 6C.
[0005]
As another conventional example of the above-described inner shell support structure of the double shell storage tank, a structure in which the inner tank of the horizontal double shell cylindrical storage tank is supported by an outer tank via wood is known. This support structure with wood is a structure in which wood having a high heat insulation effect is placed between the inner and outer tubs with an interval between them, and the inner tub is installed on the wood. The support structure made of wood has a block shape in which flat plate materials are laminated or a substantially block shape in which a large number of flat plate materials are combined.
[0006]
[Problems to be solved by the invention]
As described above, the support structure of the inner tank 4 of the double-shell spherical storage tank 1 is such that the support members 7, 8 and 9 penetrating the inside of the cold insulation layer 3 between the outer tank 2 and the inner tank 4 are made of steel or the like. Since it is formed of a material having high heat transfer and is fixed to the outer wall surface of the inner tub 4 and the inner wall surface of the outer tub 2, the cold heat from the low-temperature liquid in the inner tub 4 is transmitted to the outside, or High heat from the outside is transmitted to the low-temperature liquid in the inner tank 4, and a short path of heat is generated, so that sufficient heat insulation performance may not be obtained. For example, the heat transfer coefficient of steel is about 500 to 1500 times larger than the heat transfer coefficient of a heat insulating material, so that there are many short paths of heat.
[0007]
Further, since the support members 7, 8, and 9 are fixedly connected to the outer wall surface of the inner tub 4 and the inner wall surface of the outer tub 2 at a small number of support points, the weight is applied to the fixed support portion and a bending load is easily generated. I was worried about deformation and damage. Moreover, since there are few connection places with support leg 6A, 6B, 6C, it concentrated on the connection place with little weight, and the bending load was easy to arise. Such a supporting point of the inner tub 4 and a supporting portion of the outer tub 2 may be deformed or damaged when a large load is applied due to an earthquake or a strong wind.
[0008]
In addition, the conventional structure in which the inner tank of the horizontal double-shell cylindrical storage tank is supported with wood uses wood with high heat insulation effect, but the heat transfer coefficient of wood is a granular heat insulation such as pearlite. Since the heat transfer coefficient is about 5 to 10 times larger than that of materials, foamed heat insulating materials such as foamed plastics, and heat insulating materials such as urethane, there is a possibility that the amount of heat transfer increases. In addition, since the support structure made of wood has a block body formed by stacking flat plates or a substantially block shape formed by combining a number of flat plates, there are few spaces to be formed, and the spaces are closed spaces. The heat insulating material could not be uniformly filled. Moreover, although the block body and the support material for the substantially block body have a solid structure, vibrations such as earthquake motions are conducted without being attenuated, and therefore the inner tank is susceptible to large vibrations. In addition, if the support material of a solid block body or a substantially block body is cracked, the crack tip is sharp like a wedge, so that the crack is easy to propagate and propagate one after another. May cause damage.
[0009]
The present invention has been made in view of the problems of the prior art as described above, to improve the heat insulating properties and durability of the inner tank support structure, and with improved earthquake resistance in seismic isolation double-shelled An inner tank support structure for a spherical storage tank is provided.
[0010]
[Means for Solving the Problems]
The inner shell support structure of the double shell spherical storage tank according to the present invention forms a cold insulation layer by filling a heat insulating material between the inner tank and the outer tank, which are spaced apart from each other. A double shell spherical storage tank that supports an inner tank for storing liquid by an outer tank, and supports the outer tank with support legs installed on a foundation,
An assembly support member is formed in the frame-like structure with a heat-insulating strength member so that the formation of the cold insulation layer by the heat insulation material is not hindered, and this assembly support member has a shape that matches the curved surface shape of the inner and outer tanks. 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. The bottom of the inner tub is supported by the assembly support member, and the assembly support member returns to its original position even if it moves between the inner and outer tubs .
[0011]
Delete [0012]
Further, the inner shell support structure of the double shell spherical storage tank is provided with a space maintaining member having heat insulation on a side part or an upper part in the cold insulation layer formed between the inner and outer tanks. It is formed by hanging without sticking to.
[0013]
In addition, the inner shell support structure of the double shell spherical storage tank is provided with a base-isolating material having elasticity in the assembly support member, or a base-isolating material having elasticity in the spacing maintaining member. It is formed in the inner tank support structure which has earthquake resistance.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The inner-shell support structure of the double-shell storage tank according to the present invention will be described with reference to FIGS. 1 to 4 showing the structure of the support member of the inner-shell, taking a double-shell spherical storage tank as an example. However, it is not limited to the double-shell spherical storage tank, but various 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 insulation layer, such as a vertical double-shell cylindrical storage tank. Applies to
[0015]
As shown in FIG. 1, a double-shell spherical storage tank 1 includes an inner tank 4 for storing a cryogenic liquid or the like, an outer tank 2 concentrically spaced around the inner tank 4, and an inner tank and an outer tank. A cold insulation layer 3 filled with a heat insulating material is provided, and the outer tub 2 is supported by support legs 6 installed on the foundation 5.
[0016]
The assembly support member 10 is installed on the bottom of the cold insulation layer 3 between the inner and outer tanks, that is, on the inner bottom of the outer tank 2. The assembly support member 10 supports the bottom of the inner tub 4 to withstand the weight of the inner tub 4 and the weight of the storage liquid, and also blocks the conduction of the cold heat of the internal storage liquid in the inner tub 4 and conducts high heat from the outside. In order to shut off, a strength member having heat insulating properties is used. Further, 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 disturb the uniform filling formation of the cold insulation tank 3 formed by filling the heat insulating material. Form.
[0017]
The assembly support member 10 is a strength member excellent in heat insulation, support force, and rigidity, for example, wood such as firewood and cork, a foamed glass material or a foamed concrete material whose surface is cured, and a rectangular material or a molded material. A member such as a rod-shaped member, a pipe member, a round rod member, or a flat plate member is used. These strength members are incombustible, processed into composites and laminates by crimping and heat deposition, etc., curved by hot press processing, etc., and framed or framed and flat by gluing, assembling, bolting, etc. Are formed into a panel body or the like, and these frame bodies and panel bodies are assembled into a three-dimensional and lightweight structure.
[0018]
As shown in FIG. 2 with a part thereof omitted, the assembly support member 10 is formed in annular bodies 13 and 14 whose central portions are vertically separated, and a plurality of upright columns 15 are connected therebetween. Then, annular bodies 16 and 17 are provided at equidistant positions on the outer side of the annular bodies 13 and 14, and a plurality of radial frames 18 and 19 are provided so as to pass between the annular bodies 13 and 16 and 14 and 17. . The upper surfaces of the annular bodies 13 and 16 and the upper surface of the skeleton 18 are curved so as to match the curvature of the outer wall surface of the bottom of the inner tub 4, and the lower surfaces of the annular bodies 14 and 17 and the lower surface of the skeleton 19 are Curved to match the inner wall surface curvature, each contact surface is formed so as to be in surface contact over a wide area. The plurality of columns 15 located near the lower center of the inner tank 4 are arranged vertically so as to support the weight of the stored liquid and the inner tank 4, and the columns 15 positioned on the outer lower side surface thereof are the axis of the sphere. It is formed along a line so as to support a horizontal load. Further, by providing a diagonal member between the frames, a structure that is more resistant to twisting, bending and buckling can be obtained. The assembly support member 10 having the above structure can be easily assembled and formed in accordance with the curved wall surface shape.
[0019]
The assembly support member 10 formed of a heat-insulating material does not conduct the cold heat of the low-temperature storage liquid from the inner tank 4 and does not conduct the high heat of the outside air from the outer tank 2. There is little heat transfer between tanks, and it is possible to prevent heat short path. When the heat insulation strength member is used, its heat transfer coefficient is as small as about 1/500 to 1/500 compared with the case of joining with conventional steel materials, compared with the case of supporting with conventional wood. Is about as small as about 1/5 to 1/10, so the amount of heat transfer can be greatly reduced.
[0020]
Further, compared to the case where the block body and the substantially block body support material are used, the space between the frames of the assembly support member 10 is large, and the heat insulating material can be filled well, so that the amount of heat transfer can be reduced. . Further, since the heat insulating material is uniformly filled between the frame bodies without causing uneven portions, offset portions, space portions, and the like of the heat insulating material, the heat insulating layer 3 can be insulated even if the assembly support member 10 is present. The cold insulation layer 3 with good cold insulation performance is obtained without impairing performance. Moreover, when the packing material excellent in heat insulation performance than the said frame body and panel body is inserted | pinched and assembled in the assembly joining part of the assembly frame support member 10, the heat insulation performance of the assembly support member 10 can further be improved.
[0021]
For example, when a granular heat insulating material such as pearlite is used as the heat insulating material, uniform filling to every corner between the frames becomes easy, and when the granular heat insulating material is replaced during maintenance, the granular heat insulating material is used. Can be easily extracted between the frames. In addition, when foam insulation such as foamed urethane or foam concrete is used to fill in-situ foaming, the foam insulation is delivered to every detail between the frames, enabling uniform filling work, and compression of the foam insulation. It is not necessary to wait for the upper inner tank construction until the strength is obtained, and the upper inner tank construction can be performed immediately in a state where the inner tank load is supported by the frame, so the construction period can be shortened. In addition, when block-shaped solid heat insulating material is used, the solid heat insulating material can be applied uniformly after packing the heat insulating material such as glass wool between the frames, and the solid heat insulating material can be compacted or biased during use. Since it does not occur, the cold insulation performance can be stably maintained for a long time.
[0022]
Further, since the assembly support member 10 has a small vibration transmission section, it can swing and attenuate. That is, the plurality of pillars 15 are provided with a predetermined rigidity and strength so as to support the weight of the storage liquid and the inner tub 4, and also transmit the stress propagation to the bending load due to the shaking between the inner and outer tubs. Disperses and escapes at the inner surface, so it flexibly responds to twisting and bending and has durability. The assembly support member 10 composed of at least a plurality of vertical material columns and a plurality of horizontal material beams is less likely to reach total damage even if a part of the vertical material or horizontal material is damaged. Is also safe.
[0023]
Further, the assembly support member 10 matches the vertical axis of the curved inner and outer tubs 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 tub 2, and also on the outer wall surface of the bottom of the inner tub 4. Without sticking, it is placed at the center of the bottom between the inner and outer tanks so as to support the weight of the inner tank 4 and the weight of the stored liquid in the inner tank 4 on average. As described above, the assembly support member 10 placed at the center of the curved bottom portion between the inner and outer tubs is not easily displaced from the center position, and has a structure that returns to the original position even when moved, and thus has high stability. In addition, since the assembly support member 10 is not fixed to the inner wall surface of the outer tub 2 and the outer wall surface of the inner tub 4, when the inner and outer tubs fluctuate due to shaking or vibration due to an earthquake or strong wind, or changes in stored liquid, This displacement is not constrained, and deformation or damage does not occur even when a load is applied to the contact portion.
[0024]
Further, the assembly support member 10 is formed in a seismic isolation structure by providing the seismic isolation material 12A formed by the elastic buffer members 20 and 21. On the contact surface between the assembly support member 10 and the inner tub 4, that is, the upper surfaces of the annular bodies 13 and 16, and the upper surface of the frame 18, a material that can withstand extremely low temperatures transmitted from a low-temperature storage solution and has heat insulation and elasticity, for example, glass wool And a buffer member 20 such as asbestos. Further, the contact surface between the assembly support member 10 and the outer tub 2, that is, the lower surfaces of the annular bodies 14 and 17 and the lower surface of the skeleton 19 have good low-temperature characteristics and have heat insulation and elasticity, such as silicon rubber or synthetic resin. A buffer member 21 such as a material is provided. Since the seismic isolation material 12A formed by the buffer members 20 and 21 is adapted to the curvature shape of the inner and outer tubs, it becomes a packing material that fills the gap between the assembly support member 10 and the inner and outer tub wall surfaces, thereby improving the cold insulation performance by preventing convection. At the same time, it can absorb vibration and displacement and transmit the load to the average. Therefore, seismic isolation against vibrations and vibrations caused by earthquakes and strong winds is obtained, and durability and safety are further improved.
[0025]
As described above, when the buffer members 20 and 21 having excellent heat insulation are provided on the contact surface between the assembly support member 10 and the inner and outer tank wall surfaces and sufficient heat insulation performance is obtained, the assembly support member 10 is not necessarily insulated. A member such as steel having high rigidity and good low temperature characteristics is used without using a member having the property. By using such a member having high rigidity and strength, the pillars and beams constituting the assembly support member 10 can be made thinner, and can be easily assembled and formed by welding, screwing, or the like. .
[0026]
If a base isolation material (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 base isolation structure, horizontal displacement absorption and vibration energy absorption are further enhanced. Can be bigger. Although not shown, if a coil spring or a leaf spring is provided in the vertical direction between the frames of the assembly support part so as to absorb and relax the vertical displacement and vibration energy, the seismic isolation against the vertical load is also achieved. can get. These structures with improved seismic performance are suitable for areas where there is a lot of vibration or where the ground is soft.
[0027]
Moreover, as shown in FIG. 1, while maintaining the predetermined space | interval of the side direction thru | or the upper direction of the inner tank 4 and the outer tank 2 in the side part thru | or upper part in the cold insulation layer 3 between an inner and outer tank, In order to block the conduction of cold heat and block the conduction of high heat from the outside of the outer tub 2, a spacing maintaining member (separation member) 11 having rigidity and heat insulation is provided.
[0028]
A spacing maintaining member (separating member) 11 provided on the side portion or the upper portion in the cold insulation layer 3 between the inner and outer tanks will be described with reference to FIG. In the illustrated example, the interval maintaining member 11 that maintains a predetermined interval in the lateral direction or the upward direction of the inner tub 4 and the outer tub 2 is used by using a rigid and heat insulating member such as wood or a heat insulating composite material. The case where it forms with the rod-shaped connection member 22 is shown. Alternatively, although not shown, a frame that is assembled so that the heat insulating material passes between the frames and can be easily filled, or a flat frame that is provided with a through-hole that allows the heat insulating material to pass and is easily filled, or these frames It is formed in the panel frame etc. which combined. Since the heat conduction between the inner and outer tubs is cut off by the connecting member 22 having the heat insulating property, a short path of heat does not occur through the gap maintaining member 11. Further, as described above, even if there is the gap maintaining member 11 in the cold insulation layer 3, it does not hinder the filling of the heat insulating material, so that a non-uniform portion of the space and the heat insulating material does not occur in the cold insulation layer 3, The cold insulating layer 3 excellent in heat insulation performance can be formed.
[0029]
Further, the distance maintaining member 11 is not fixed to the inner and outer tank wall surfaces, for example, on the mounting bracket 24A fixed to the outer wall surface of the inner tank 4 and the mounting bracket 24B fixed to the inner wall surface of the outer tank 2. It is suspended and attached so as to be movable within a predetermined distance from the side to the top by means of loose hole stoppers or insertion guide structures (not shown). In this way, since the interval maintaining member 11 is movably attached without being fixed to the inner and outer tank wall surfaces, the inner and outer tank wall surface attachments can follow the displacement without restricting the lateral or upward movement between the inner and outer tanks. No deformation or damage to the part.
[0030]
In addition, at the tip of the connecting member 22, the seismic isolation of the buffer members 23 </ b> A and 23 </ b> B, such as glass wool, asbestos, foamed material, composite material, or synthetic rubber, having low temperature resistance, good low temperature characteristics, and heat insulation and elasticity. The material 12B is provided to form an earthquake resistant structure that moves elastically and absorbs vibrations and shocks. As described above, the seismic isolation material 12B provided in the interval maintaining member 11 elastically absorbs and relaxes the displacement of the inner and outer tanks in the lateral direction or upward direction. A safe earthquake-resistant structure.
[0031]
Another embodiment of the assembly support member 10 will be described with reference to FIG. The assembly support member 10 uses a strength member excellent in heat insulation, support force, and rigidity, for example, a flat plate made of wood, fiber reinforced glass material, foam glass material, foam concrete material, or the like. These members are processed into plywoods of composite materials or laminated materials by crimping or heat-bonding, etc., curved by hot pressing, etc., and assembled into a panel frame by bonding, incorporating, bolting, or the like. As shown in FIG. 4, the assembly support member 10 is provided with, for example, an annular flat plate 25 having the same plate width on the side portion, and a lower bottom portion thereof connected by a plurality of assembled plates 27 having the same plate width. It is formed in a frame that matches the interval. A plurality of substantially circular through holes 28 are provided in the annular flat plate 25 of the assembly support member 10, and a plurality of substantially circular through holes 29 are provided in the assembly plate 27 of the assembly support member 10. Provide.
[0032]
Thus, the assembly support member 10 using a flat plate is easy to manufacture because it matches the curved wall surface shape of the inner and outer tubs by the curved cutting of the end of the flat plate. In addition, when a curved plate or the like (not shown) that is pressed according to the curvature of the inner and outer tank abutting wall surface is attached to the upper or lower abutting portion of the assembly support member 10, the abutting area is increased and the load is increased. As a result, the structure is stable.
[0033]
The assembly 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, and the through holes 28 and 29 are also filled with the heat insulating material. Therefore, there is no fear that non-uniform portions, offset portions, space portions, etc. of the heat insulating material are generated in the cold insulation tank 3, and good cold insulation performance can be obtained.
[0034]
As described above, the assembly support member 10 provided with the substantially circular through-holes 28 and 29 in the flat plate material maintains a predetermined rigidity and strength, and is also substantially circular through-holes 28 and 29 against bending load. Since the bending load is distributed and released at the curved inner surface edge, the stress propagation is not concentrated at one point, and the twist and the deflection are absorbed and the durability is obtained. Further, since the substantially circular through holes 28 and 29 have a crack propagation stop hole function, the structure has an excellent crack propagation stop function.
[0035]
【The invention's effect】
As apparent from the description, the inner tank support structure of the double-shell spherical storage tank according to the present invention is such that the assembly support member is formed in a shape that matches the curved surface shape of the inner and outer tanks, and the upper part is the bottom part of the inner tank. The assembly support member is placed on the inner bottom portion of the outer tub without being fixed to the inner and outer tub wall surfaces while the lower surface is brought into surface contact with the outer wall surface and the lower butt is in surface contact with the inner wall surface of the outer tub. It is formed so as to support the bottom of the tank, and even if this assembly support member moves between the inner and outer tanks, it will return to its original position. Since the structure is restored to the original position, the stability is good. If the displacement of the abutting portion where the assembly support member and the inner and outer tank wall surfaces are in contact with each other is not restricted when the inner and outer tanks change, the displacement follows the displacement without restricting the mutual movement of the inner and outer tanks. Since the contact portion is not deformed or damaged, the safety is improved against a load applied to the wall surface contact portion due to an earthquake, a strong wind, a change in stored liquid, or the like.
[0036]
In addition, since the assembly support member assembled in the frame-like structure is installed on the inner bottom of the outer tub and the bottom of the inner tub is supported by this assembly support member, the space between the frames of the assembly support member There are many, and the heat insulating material can be filled well. Therefore, when the heat insulating material is filled into the cold insulation layer in which the assembly support member is installed, non-uniform portions, offset portions, space portions, and the like of the heat insulating material are not generated. In addition, since the heat insulating material is uniformly filled between the frames, even if there is an assembly support member, the heat insulating performance is not impaired, and a cold insulating layer having a good cold insulating performance can be obtained.
[0037]
In addition, the assembly support member has a predetermined rigidity and strength so as to support the weight of the storage liquid and the inner tank by a plurality of standing columns, and also prevents stress propagation against bending load due to the mutual shaking between the inner and outer tanks. It disperses and escapes at the inner surface of the body-shaped opening, and flexibly absorbs and relaxes twists and deflections, thus improving durability against vibration and shaking such as earthquakes and strong winds. Further, since the frame body has a small vibration transmission cross section, it is possible to swing and attenuate. An assembly support member composed of at least a plurality of vertical material columns and a plurality of horizontal material beams is less likely to reach total damage even if a part of the vertical material or horizontal material is damaged. It is safe. In addition, in the case of an assembly support member provided with a substantially circular through-hole in a flat plate material, the bending load is dispersed and released at the curved inner end of the substantially circular through-hole, so stress propagation does not concentrate on one point. It is easy to absorb and relax twisting and bending, and durability is obtained. Further, since the substantially circular through-hole has a crack propagation stop hole function, the structure has an excellent crack propagation stop function.
[0038]
In addition, the assembly support member is made of wood such as coffin or cork, foam glass material or foam concrete material whose surface is hardened, rectangular or molded material made into a rod, pipe material, round bar, or flat plate These materials are made non-combustible by using materials such as materials, processed into composite materials and laminated materials by crimping and heat welding, etc., curved by hot press processing, etc., bonded and assembled, bolted, etc. As a result of being assembled into a three-dimensional frame body, the supporting force, the rigidity strength and the durability are excellent, the weight is reduced, and it can be easily manufactured.
[0039]
In addition, since the assembly support member is assembled and formed in a frame-like structure with a heat-insulating strength member, the amount of heat transmitted through the assembly support member is small, and a short path of heat between the inner and outer tanks is prevented, and good cold insulation performance is achieved. Can be maintained.
[0040]
In addition, a space maintaining member having heat insulation is provided on the side part or upper part between the inner and outer tanks, and the inner tank support structure formed by suspending the space maintaining member without being fixed to the inner and outer tank wall surfaces includes the distance maintaining member . Since the amount of heat transferred is small, there is little short path of heat from the side to the top between the inner and outer tanks, maintaining good cold insulation performance, and following displacement without restraining the lateral and upward movement between the inner and outer tanks. Since the contact portion is not deformed or damaged, the safety is further improved against a lateral load or an upward load due to an earthquake, a strong wind, a change in stored liquid, or the like.
[0041]
Also, an elastic base isolation material is provided on the assembly support member, or an elastic base isolation material is provided on the interval maintaining member , thereby supporting the inner shell of the double shell storage tank having the earthquake resistance of the base isolation structure. The structure is a packing material that the elastic seismic isolation material fits into the curvature shape of the inner and outer tanks and fills the gap between the inner and outer tank wall surfaces, and can absorb vibration and displacement and transmit the load to the average, Seismic isolation against shaking and vibration due to earthquakes and strong winds is obtained, further improving durability and safety.
[0042]
[Brief description of the drawings]
FIG. 1 is a side cross-sectional explanatory view showing an assembly support member and an interval maintaining member provided between inner and outer tanks of a double-shell spherical storage tank in an embodiment of the inner-shell support structure of a double-shell storage tank according to the present invention. is there.
FIG. 2 is a perspective explanatory view in which a part of an embodiment of an assembly support member provided at the bottom between the inner and outer tanks is omitted.
FIG. 3 is a perspective explanatory view showing an embodiment of a distance maintaining member provided on a side part or an upper part in a cold insulation layer formed between an inner and outer tank.
FIG. 4 is an explanatory perspective view showing another embodiment of the assembly support member provided at the bottom between the inner and outer tanks.
5 (a), (b), and (c) are side cross-sectional explanatory views showing an inner tank support structure of a conventional double shell storage tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spherical storage tank 2 Outer tank 3 Cooling layer 4 Inner tank 5 Foundation 6, 6A, 6B, 6C Support leg 7, 8, 9 Support member 10 Assembly support member 11 Spacing maintenance member (separation member)
12, 12A, 12B Seismic isolation material 13, 14 Annular body 15 Column 16, 17 Annular body 18, 19 Frame 20, 21 Buffer member 22 Connecting member 23A, 23B Buffer member 24A, 24B Mounting bracket 25 Annular flat plate 27 Assembly plate 28, 29 Through-hole

Claims (3)

Between the inner tub and outer tub provided at a distance from each other, a heat insulating material is filled to form a cold insulation layer, and the inner tub for storing the low-temperature liquid is supported by the outer tub on the foundation. It is a double shell spherical storage tank that supports this outer tank with installed support legs,
An assembly support member is formed in the frame-like structure with a heat-insulating strength member so that the formation of the cold insulation layer by the heat insulation material is not hindered, and this assembly support member has a shape that matches the curved surface shape of the inner and outer tanks. 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. A double-shell spherical storage tank , wherein the assembly support member is formed to support the bottom of the inner tub, and the assembly support member returns to its original position even if it moves between the inner and outer tubs . Inner tank support structure. A space maintaining member having a heat insulating property is provided on a side portion or an upper portion in the cold insulation layer formed between the inner and outer tanks, and the space maintaining member is formed to be suspended without being fixed to the inner and outer tank wall surfaces. The inner shell support structure for a double-shell spherical storage tank according to claim 1. A seismic isolation material having elasticity is provided in the assembly support member, or a seismic isolation material having elasticity is provided in the interval maintaining member, and the inner tank support structure having a seismic isolation structure is formed. An inner tank support structure for a double shell spherical storage tank according to claim 1 or 2.

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