JPH0541546A - Fiber-reinforced resin made multiple cylinder and manufacture thereof and heat insulation support structure based on its application - Google Patents

Abstract

PURPOSE:To enable the manufacture of FRP-made one piece molding multiple cylinder having excellent insulation performance and strength by laying out a plurality of cylinders in different sizes and molding adjacent cylinders at their one ends or central parts. CONSTITUTION:The present invention relates to a fiber reinforced plastics (FRP)-made one piece molding multiple cylinder which is proper to thermal support structure. More specifically, when the molding of a portion equivalent to an inner cylinder is finished, an auxiliary die 18 is fixed with an inner molding die 17 with a key 20. This die 17 is rotated so as to wind up a portion 25 which bonds the end of the cylinder with resin-impregnated reinforced fiber from the tip of the auxiliary die 18 and further wind up the outer peripheral art of the auxiliary die 18, thereby forming an intermediate cylinder 23. Then, a portion 26 which bonds the other end of the cylinder is wound up from the tip of an auxiliary die 19, thereby forming an outer cylinder 24. Then, when the auxiliary dies 18, 19 and keys 20 and 21 are removed and the inner molding die 17 is pulled out, there is available a FRP type triplex cylinder which is molded in one piece. This construction makes it possible to manufacture with a reasonable process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced resin (sometimes referred to as FRP hereinafter) integrally molded multi-layer cylinder suitable for a heat insulating support structure, a method for manufacturing the same, and a heat insulating support structure for a cryogenic container using the same. ..

[0002]

2. Description of the Related Art Containers for holding low temperature, particularly, containers for holding cryogenic temperature, for example, insulated containers for storing liquid helium are excellent in order to minimize evaporation of liquid helium. It is required to have heat insulating properties and minimize heat invasion into the interior. In a heat insulating container for a superconducting magnet used in a levitation railway, it is necessary to transfer the electromagnetic force or the self-weight generated by the superconducting magnet to the outside at room temperature atmosphere (room temperature part) side. Therefore, a supporting structure having a strong supporting force and excellent heat insulating property is formed between the liquid helium inner tank containing the superconducting coil and the room temperature part.

As a heat insulating support structure for such a cryogenic container, there is known a system in which a heat conduction path is lengthened and a heat loss is reduced by adopting a multi-cylinder structure. For example,
Several FRP pipes are arranged concentrically, one end of the pipe is connected to the inner pipe, and the other end is connected to the outer pipe, which is a barbed type or adjacent concentric cylinders. It is known that the cylinders are joined together alternately at the central portion and at both end portions of the cylinder and integrated. (JP-B-56-48040, JP-A-59-
98570 and Japanese Patent Publication No. 62-22442).
In these heat insulating support structures, the FRP concentric cylinders are integrated by bonding with an adhesive or screws. (Japanese Patent Publication No. 62-22442)

[0004]

However, in the above-mentioned conventional method, it is rather difficult to alternately join and integrate the ends of adjacent cylinders, and the strength of the obtained joining is not always sufficient. It was As a concrete problem, it is necessary to perform machining to smooth the surface of the cylinder before joining, and even if it is attempted to connect with the adhesive at the end faces of the cylinders that are concentrically overlapped with each other, sufficient pressure is applied. There was a problem that it was difficult to apply, and it was difficult to obtain adhesive strength. The present invention is intended to solve the above problems. That is, the present invention provides an FRP integrally molded multi-cylinder having excellent heat insulation performance and strength, a manufacturing method thereof, and an integrally molded heat insulating support structure using the same.

[0005]

The present invention is as described below. That is, 1. A fiber-reinforced resin multi-cylinder having a structure in which a plurality of cylinders having different diameters are arranged in an overlapping manner, and adjacent cylinders are integrally molded at one end portion or an intermediate portion thereof.

As a manufacturing method thereof, 2. (1)
A step of forming a fiber reinforced resin layer on the surface of the inner cylinder molding die to mold the inner cylinder, (2) the inner cylinder molded on the surface of the inner cylinder molding die, one end portion or an intermediate portion thereof. A step of installing a tubular auxiliary mold that covers a part of the inner part while fixing it to one end or both ends of the inner cylinder forming mold, and (3) a fiber-reinforced resin layer on the surface of the auxiliary mold And a step of forming an outer cylinder by forming it on the surface of the inner cylinder which is not covered by the auxiliary mold, and a plurality of cylinders having different diameters are arranged in an overlapping manner, and adjacent cylinders are arranged. A method for manufacturing a fiber-reinforced resin multi-cylinder having a structure in which one end portion or an intermediate portion is integrated.

Further, as an application of the FRP multi-cylinder of the present invention, 3. Multiple cylinders with different diameters are stacked and arranged,
The present invention relates to a heat insulating support structure for a cryogenic container, characterized in that adjacent cylinders are multiple cylinders made of fiber reinforced resin having a structure in which one end portion and / or an intermediate portion thereof are integrally molded.

In carrying out the present invention, the cross-sectional shape of a plurality of cylinders having different diameters, the number of cylinders, or a combination thereof, the position of the joint portion where adjacent cylinders are integrally molded by FRP and joined, and Various modes can be adopted depending on the purpose of use by selecting the length of the joint portion, the type of resin and the type of reinforcing fiber used for the FRP, the method for forming the FRP layer, the thickness of the FRP layer and the laminated structure thereof.

In the present invention, the cross-sectional shape of the cylinder may be a perfect circle, an ellipse, a polygon such as a square or a rectangle, or any combination thereof. A combination of a perfect circle and / or an ellipse is more preferable from the viewpoint of the strength of the molded body, the molding process, and the die manufacturing. The number of cylinders is at least two and can be appropriately selected according to the purpose of use. In the present invention, the diameter of a cylinder refers to the inner diameter in a true circle, the major diameter in an ellipse, and the inner distance between opposite sides in a polygon. It is preferable that the multiple cylinders are stacked concentrically, but an eccentric stack may be used.

The position of the joint that is integrally molded and joined by FRP can also be selected at the end or in the middle depending on the application and the required strength of the molded body. In order to lengthen the path of heat transfer and enhance the heat insulating effect, an integrally molded body composed of three or more cylinders and alternately joined at both ends can be used (aspect of Example 2). When applied to a heat insulating support structure in which a compressive force acts in a direction perpendicular to the axial direction of the integrally formed body, it is preferable to use the integrally formed body joined at the center of the cylinder (aspect 1 of the first embodiment). Also, a combination of one end portion and the central portion can be used if necessary. Further, the joining is not limited to the central portion, but can be joined at an intermediate portion in the sense of an arbitrary intermediate between both end portions. The length of the joint portion can be appropriately selected in consideration of the heat insulating effect and the strength.

The reinforcing fibers used in the present invention include alumina fibers, ceramic fibers other than alumina fibers, glass fibers, carbon fibers, aramid fibers and the like. For very low temperature applications, carbon fiber is preferable because it has low thermal conductivity, and glass fiber is preferable because it has low thermal conductivity in the temperature range from liquid nitrogen to room temperature. Alumina fibers have particularly excellent heat insulation performance from room temperature to extremely low temperatures. For example, carbon fiber has a lower thermal conductivity than glass fiber in an extremely low temperature region, but glass fiber has a lower thermal conductivity than carbon fiber in a room temperature region. Therefore, in order to minimize the amount of heat penetration, it is necessary to take a complicated structure in which glass fiber reinforced resin and carbon fiber reinforced resin are used in combination. However, the alumina fiber has a wide temperature range from a very low temperature to a room temperature,
Since the glass fiber and the carbon fiber have almost the same thermal conductivity as the lower one, the whole can be made of a single material made of an alumina fiber reinforced resin (hereinafter, sometimes referred to as ALFRP). ..

The composition of the alumina fiber used in the present invention has an alumina content of about 60% by weight or more and a silica content of about 40% by weight or less, preferably 72% by weight or more of alumina and 28% by weight or less of silica, more preferably Is preferably 75 to 98% by weight of alumina and 25 to 2% by weight of silica. In the silica content, the content of lithium, beryllium, boron, sodium, magnesium, phosphorus, potassium, calcium, titanium, chromium, manganese is preferably 10% by weight or less, preferably 5% by weight or less, based on the total weight of the fiber. It may be replaced by one or more oxides of yttrium, zirconium, lanthanum, tungsten, barium.

As the form of the fiber used in the present invention, it is preferable to use a long fiber in order to take advantage of general high strength characteristics. When it is a long fiber, it is preferably used as roving or as a woven fabric. A mat is preferable when a shearing force is applied to the end joints of the cylinder. As an alumina fiber, Artex (Sumitomo Chemical Co., Ltd.)
Made), Arcen (made by Denki Kagaku Kogyo Co., Ltd.), Nexte
l (manufactured by 3M Company), Almax (manufactured by Mitsui Mining Co., Ltd.),
FP Fiber (manufactured by Du Pont) and the like can be mentioned (all are trade names). Among these, preferred alumina fibers are ALTEX (Sumitomo Chemical Co., Ltd.).
Manufactured by Denki Kagaku Kogyo Co., Ltd.).

The strength and elastic modulus of the alumina fiber are 150 kg when the fiber diameter is 10 μm to 15 μm.
/ Mm ² , and those having a value of 20 t / mm ² or more are preferable. For example, the Altex, which is an alumina fiber having a diameter of 10 μm to 15 μm and having a composition of alumina content 85% by weight and silica content 15% by weight, has a tensile strength of 18
A value of 0 kg / mm ² or more and a tensile elastic modulus of 21 t / mm ² or more is shown. Further, it is desirable that the X-ray structure of the alumina fiber does not substantially show the reflection of α-alumina. Generally, in inorganic fibers, the crystal grains of the inorganic substance forming the fibers grow in the fiber at a high temperature, and the fiber strength is remarkably lowered due to the grain boundary destruction between these crystal grains. This circumstance is characterized by the reflection of α-alumina in the X-ray analysis image of the alumina fiber according to the results of studies by the present inventors. Therefore, the alumina fiber used in the present invention is preferably manufactured so that the reflection of α-alumina does not appear in the X-ray analysis image. Since ARTEX is composed of very fine crystallites of about several hundred liters, it has a thermal conductivity smaller than that of ordinary alumina fiber, and is therefore an optimum material for the purpose of the present invention.

As the synthetic resins used in the matrix of the present invention, known synthetic resins generally used in the production of fiber reinforced composite materials by the filament winding method, the hand layup method and the like are used. For example, epoxy resin, phenol resin, alkyd resin, urea resin, melamine resin, unsaturated polyester resin, aromatic polyamide resin, polyamide-imide resin,
Thermosetting resin such as vinyl ester resin, polyester-imide resin, polyimide resin, polybenzothiazole resin, silicon resin, polyethylene, polypropylene, polymethylmethacrylate, polystyrene (including so-called high impact polystyrene), polyvinyl chloride , Fluorine resin, ABS resin, styrene-acrylonitrile copolymer, polyamide (nylon 6,6,6,6.
10, 6, 11, 6, 12, etc.), thermoplastic resins such as polyacetal, polysulfone, polycarbonate, polyphenylene oxide, polyetheretherketone, polyetherketone, polyamideimide, polysulfone, polyethersulfone, and aromatic polyester. You can Preferred thermosetting resin compositions include epoxy resins, unsaturated polyester resins and vinyl ester resins. Preferred thermoplastic resins include polyetheretherketone, polyethersulfone and polyamideimide resins. Further, in the use of a heat insulating support structure, it is also effective to use an epoxy resin for plating in order to reduce the heat radiation of the support material and perform plating or vapor deposition after molding.

In the present invention, as a method for molding the FRP layer, a filament winding method or a hand layup method, that is, a method of winding a prepreg around a mold surface or the like can be applied. Of these, the filament winding method is preferable from the viewpoint of operability. The winding angle of the reinforcing fiber, the winding thickness, the combination thereof in the case of a laminated structure, and the number of laminated layers can be appropriately selected according to the shape and strength of the target molded body.

After the completion of winding the FRP, if the resin used is a room temperature curable resin, it is left for a predetermined time, and if it is a heat curable resin, it is held at a predetermined temperature for a predetermined time, and then the mold is pulled out. The molding of the integrally molded body is completed. As a method of heat curing, a known one such as a heating furnace, an autoclave, or a hot press can be used.

It is preferable that the auxiliary mold used in the present invention is provided with a taper on the outer periphery of the auxiliary mold inward from the end toward the center at an angle of 0.5 ° or more. When the taper is not attached or when the taper is less than 0.5 °, it is difficult to pull out the auxiliary mold after curing the resin. As for the materials of the inner cylinder molding die and the auxiliary die used in the present invention, it is preferable to use two kinds of metals having different thermal expansion coefficients. That is, when a metal having a coefficient of thermal expansion larger than that of the auxiliary mold is used for the inner cylinder molding die, the inner cylinder molding die expands more during the curing of the heat-curable resin, so that the molding is performed. Pressure is applied to the tubular portion, and the fibers are better impregnated with the resin. Also, when the mold is removed, if the inner mold is cooled when it is cooled, the inner cylinder mold shrinks more. Specifically, for example, aluminum can be used for the inner cylinder forming die and steel can be used for the outer cylinder forming auxiliary die.

The heat insulating support structure of the present invention can be manufactured by using the FRP integrally molded multi-cylinder of the present invention described above alone or in combination. For example, two types of FRP integrally molded double cylinders having different diameters are stacked to form a quadruple cylinder. Specific specifications such as the size, shape, mechanical strength, and heat insulating performance of the heat insulating support structure can be appropriately designed according to the application. INDUSTRIAL APPLICABILITY The heat insulating support structure of the present invention is used for a container for holding a low temperature, particularly a container for holding an extremely low temperature, for example, a heat insulating container for storing liquid helium, and shows excellent heat insulating properties and strength. , Power storage (SMES), medical (M
It can be used for a heat insulating support structure of a heat insulating container for superconducting magnets such as RI.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. Example 1 FIG. 1 shows a partially cut sectional view of a mold used for filament winding. The figure shows a state in which a steel auxiliary mold (15) is fixed by bolts (16) to both ends of a cylindrical aluminum inner cylinder molding mold (the mold is also referred to as a mandrel) (14). First, the auxiliary mold (15) and the bolt (1
Excluding 6), the rotating inner-cylinder molding die 14 is wrapped with an alumina fiber impregnated with an epoxy resin to form a portion corresponding to the inner cylinder. The alumina fibers and epoxy resin used are as follows.

A. Alumina fiber “Altex” SX-11-1K (Sumitomo Chemical Co., Ltd .: fiber diameter 15 μm) B. Epoxy resin composition Bisphenol F ⁽¹⁾ ──── 54 parts by weight Triglycidyl-4-amino-m-cresol ⁽²⁾ ──── 23 parts by weight Neopentyl glycol diglycidyl ether ⁽³⁾ ────-23 Parts by weight m-phenylenediamine / diaminodiphenylmethane (60/40) ⁽⁴⁾ ────── 28 parts by weight (Note) (1) Epiclon (registered trademark) 830 manufactured by Dainippon Ink and Chemicals, Inc. (2) Sumiepoxy (Registered trademark) ELM-100 manufactured by Sumitomo Chemical Co., Ltd. (3) Kyoeisha Oil and Fat Chemical Co., Ltd. 1500NP (4) TONOX (registered trademark) 60/40 manufactured by Uniroyal Co., Ltd.

Subsequently, the inner cylinder forming mold (14) is stopped, and the auxiliary mold (15) is fixed to both ends of the inner cylinder forming mold (14) with bolts (16). The mold (14) is rotated again, and the reinforcing fibers impregnated with the resin are wound around the auxiliary mold (15). The central part, which is not covered by the auxiliary mold, is directly wound around the surface of the cylinder. Thus, the outer cylinder and the joint are molded. The auxiliary die (15) is tapered inward from the end toward the center at an angle of 1 °. After leaving it for a specified time at a specified temperature, remove the bolt (16) and then use the auxiliary mold (1
When 5) is pulled out, a double cylinder made of FRP is obtained, which is connected at the central portion by integral molding of FRP. A sectional view of the double cylinder is shown in FIG.

FIG. 3 is a sectional view of a heat insulating support structure for a cryogenic container using the FRP double cylinder shown in FIG. This is the FRP double cylinder in which the adjacent outer cylinder (1) and inner cylinder (2) of the present invention are integrated in the central portion (3), and the adjacent outer cylinder (4),
The heat insulation support structure which consists of the quadruple cylinder which the inner cylinder (5) joined with the FRP double cylinder integrated by the central part (6) with the connection jig (7) is shown. The heat insulating support structure is a cryocontainer side wall (8)
The side wall (9) of the mounting portion at room temperature is connected and fixed. A well-known method such as welding or pin joining is used as a fixing method for each.

FIG. 4 shows a heat insulating structure for a superconducting coil used in a levitation railway, and is a schematic side view of a heat insulating structure of a cryogenic container using the heat insulating support structure in FIG. The cryogenic container (12) and the dolly mounting part (11) are fixed by the heat insulating support structure (10). Here, auxiliary wheels and the like are omitted and a part (13) of the carriage is shown.

Example 2 FIG. 5 shows a set of molds (also called mandrels) used when the present invention is manufactured by the filament winding method. Cylindrical mold with one end surface of dome shape (1
7) Insert the auxiliary mold (18) and the auxiliary mold (19) into the keys (2
The fixed state is shown in 0) and (21). The mold for forming the inner cylinder preferably has a dome shape on one end surface. When wrapping the dome-shaped part with resin-impregnated reinforcing fibers, it is not necessary to fold the reinforcing fibers using pins, etc., which is advantageous in the process, and the work of cutting and removing unnecessary parts after molding is eliminated. It is economically superior. In addition, it is possible to exert stable strength against a load in the axial direction.

In the method for manufacturing the integrally molded FRP multi-cylinder of the present invention, first, the inner cylinder molding is rotated with the auxiliary molds (18), (19) and the keys (20), (21) removed. The reinforcing fiber impregnated with the same resin as in Example 1 is wound around the mold (17). Then, when the part corresponding to the inner cylinder can be molded, the rotation of the mold (17) is stopped,
Press the auxiliary mold (18) with the key (20) to mold the inner cylinder mold (1
7), the mold (17) is rotated again, and the portion (25) that joins the ends of the cylinder in FIG. 6 with the resin-impregnated reinforcing fiber is fixed to the auxiliary mold (18). The intermediate cylinder (23) is formed by winding from the tip and further winding the outer periphery of the auxiliary mold (18). Next, the rotation of the mold is stopped, and the auxiliary mold (19) is pressed with the key (21) to mold the inner cylinder (17).
Then, the portion (26) to be joined at the other end of the cylinder in FIG. 6 with the reinforcing fiber impregnated with the resin is wound from the tip of the auxiliary die (19), and the auxiliary die (1
The outer periphery of (9) is wound to form the outer cylinder (24). After holding at a predetermined temperature for a predetermined time, the auxiliary molds (18), (1
9) and the keys (20) and (21) are removed, and the inner cylinder molding die (17) is pulled out to obtain an integrally molded FRP triple cylinder which is alternately coupled at the ends of adjacent cylinders. ..

FIG. 8 shows an example of a cross-sectional view of a heat insulating support structure for a cryogenic container using the FRP integrally molded triple cylinder of the present invention shown in FIG. The heat insulating support structure is attached to the low temperature container side attachment portion (3
2) and the mounting portion (33) on the room temperature side, mounting bolt (28), mounting seat (29) and mounting nut (3)
0) and the attachment jig (31). Well-known methods such as welding, bolt joining, and pin joining can be used as the fixing method at the attachment portion.

FIG. 7 shows one modification of the FRP integrally molded triple cylinder according to the second embodiment of the present invention.

[0029]

According to the manufacturing method of the present invention, it becomes possible to manufacture an FRP integrally molded multi-cylinder having various shapes excellent in mechanical strength and heat insulation effect by a rational process. Industrial significance is great. In particular, the integrally molded heat-insulating support structure of a cryogenic container made of alumina fiber reinforced resin has excellent tensile strength, bending strength, and respective rigidity, excellent interlaminar shear strength, and excellent heat insulation properties from the low temperature range to the normal temperature range. I have.

[Brief description of drawings]

FIG. 1 is a partially cut cross-sectional view of a set of molds for molding a double-cylinder made of FRP in which adjacent cylinders are integrated at a central portion of the present invention.

FIG. 2 is a partially cut cross-sectional view of an FRP double cylinder of the present invention in which adjacent cylinders are integrated at a central portion.

FIG. 3 is an integrated FR of different diameters according to the present invention.
Sectional drawing of the heat insulation support structure of the cryogenic container made into the quadruple cylinder by combining two P double cylinders.

FIG. 4 is a side view of a heat insulating structure of a levitation railway which uses the heat insulating support structure for the cryogenic container of the present invention.

FIG. 5 is a cross-sectional view of a set of molds for molding a FRP triple cylinder of the present invention in which adjacent cylinders are alternately integrated at their ends.

FIG. 6 is a cross-sectional view of an FRP triple cylinder of the present invention in which adjacent cylinders are alternately integrated at their ends.

7 is a cross-sectional view of a modification of the FRP triple cylinder of the present invention in FIG.

FIG. 8 is a cross-sectional view of a heat insulating support structure for a cryogenic container using an FRP triple cylinder in which adjacent cylinders of the present invention are alternately integrated at their ends.

[Explanation of symbols]

1,4 ───FPR integrally molded double cylinder outer cylinder 2,5 ───FPR integrally molded double cylinder inner cylinder 3,6 ───FPR integrally molded double cylinder Central part of 7 ──── Connection jig 8 ────Cryogenic container wall 9 ────Mounting part side wall 10 ────FRP monolithic multi-layer cylinder (insulation support material) 11 ─── Mounting part 12 ────Cryogenic container containing superconducting coil 13 ────Part of trolley 14 ────Cylinder mold for inner cylinder molding 15 ────Auxiliary mold (for outer cylinder) ) 16 ──── Bolt 17 ──── Cylindrical mold with one end for forming inner cylinder 18, 19 ──── Auxiliary mold (for intermediate cylinder and outer cylinder) 20, 21 ── ─ Key (for mounting auxiliary mold) 22 ──── Inner cylinder part of FRP integrally molded triple cylinder 23 ──── Intermediate cylinder part of FRP integrally molded triple cylinder 24 ──── Outer cylinder part of integrally molded triple cylinder made of RP 25,26 ─────────────────────────────────────── ─────────────────────────── ───────── ────────────── ────────── ─────────── ──────── ──── ─── Mounting bolt 29 ──── Mounting seat 30 ──── Mounting nut 31 ──── Mounting jig 32 ──── Low temperature container side mounting portion 33 ──── Room temperature side mounting portion Fig. 1 4 and reference numerals 1 to 16 correspond to the first embodiment, and FIGS.
Reference numerals 17 to 33 correspond to those in the second embodiment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshifumi Nakano 6 Kitahara, Tsukuba, Ibaraki Sumitomo Chemical Co., Ltd.

Claims (13)

[Claims] 1. A plurality of cylinders having different diameters are stacked and arranged.
A fiber-reinforced resin multi-cylinder having a structure in which adjacent cylinders are integrally molded at one end or an intermediate part thereof. 2. A fiber-reinforced resin multi-layer cylinder having a structure in which a plurality of cylinders having different diameters are concentrically overlapped with each other, and adjacent cylinders are integrally molded at their central portions. 3. A fiber-reinforced resin multi-cylinder having a structure in which a plurality of cylinders having different diameters are concentrically overlapped with each other and adjacent cylinders are integrally molded at one end thereof. 4. The fiber-reinforced resin multiple cylinder according to claim 1, wherein the fiber-reinforced resin is an alumina fiber-reinforced resin. 5. A step of (1) forming a fiber reinforced resin layer on the surface of an inner cylinder molding die to mold the inner cylinder, and (2) a step of molding the inner cylinder molding die on the surface thereof. A step of fixing a cylindrical auxiliary mold for covering the cylinder while leaving a part of one end or a middle part thereof fixed to one end or both ends of the inner cylinder molding mold, and (3) fiber reinforced resin Forming a layer on the surface of the auxiliary mold and on the surface of the inner cylinder not covered by the auxiliary mold to form an outer cylinder.
A method for manufacturing a fiber-reinforced resin multi-cylinder described. 6. (1) A step of forming a fiber reinforced resin layer on the surface of a cylindrical inner cylinder molding die to mold the inner cylinder, (2) molding on the surface of the inner cylinder molding die. A step of installing a cylindrical auxiliary mold that covers the inner cylinder while leaving a part of the central part thereof fixed to both ends of the cylindrical molding mold; and (3)
3. The fiber according to claim 2, further comprising a step of forming a fiber reinforced resin layer on the surface of the auxiliary mold and on the surface of the inner cylinder not covered by the auxiliary mold to mold an outer cylinder. A method for manufacturing a reinforced resin multi-cylinder. 7. A step of (1) forming a fiber reinforced resin layer on the surface of a cylindrical inner cylinder molding die to mold the inner cylinder, and (2) molding the surface of the inner cylinder molding die. A step of installing a cylindrical auxiliary mold that covers the inner cylinder while leaving the end portion thereof fixed to one end of the inner cylinder molding die, and (3) the fiber-reinforced resin layer to the auxiliary mold. 4. The method for producing a fiber-reinforced resin multiple cylinder according to claim 3, further comprising the step of forming the outer cylinder by forming the outer cylinder on the surface of the inner cylinder and the surface of the inner cylinder not covered by the auxiliary mold. 8. The method for producing a fiber-reinforced resin multiple cylinder according to claim 5, 6 or 7, wherein the fiber-reinforced resin layer is formed by a filament winding method. 9. The method for producing a fiber-reinforced resin multi-cylinder according to claim 5, 6, 7 or 8, wherein the fiber-reinforced resin comprises an alumina fiber-reinforced resin. 10. A fiber-reinforced resin multiple cylinder having a structure in which a plurality of cylinders having different diameters are arranged in a stack, and adjacent cylinders are integrally molded at one end portion and / or an intermediate portion thereof. Insulation support structure for cryogenic containers. 11. A fiber-reinforced resin multi-cylinder having a structure in which a plurality of cylinders having different diameters are concentrically overlapped with each other, and adjacent cylinders are integrally molded at the center thereof. Insulation support structure for cryogenic containers. 12. A multi-cylinder made of fiber reinforced resin having a structure in which a plurality of cylinders having different diameters are concentrically overlapped with each other and adjacent cylinders are integrally molded at one end thereof. Insulation support structure for cryogenic containers. 13. The heat insulating support structure for a cryogenic container according to claim 10, 11 or 12, wherein the fiber reinforced resin is an alumina fiber reinforced resin.