Insulation construction method

Abstract

To provide a heat insulating construction method capable of improving construction workability and maintaining a state after construction, and having excellent heat insulating performance.SOLUTION: A heat insulating construction method for plant equipment 1 comprises: covering at least a part of the plant equipment 1 with plate materials 10a11, 10a12 so that an undiluted solution injection space S can be created between themselves and the plant equipment 1; pouring foamed plastic undiluted solution into the undiluted solution injection space S; foaming and hardening the undiluted solution while restraining the outward spread of the plate materials 10a11, 10a12; and forming a heat insulating layer 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a thermal insulation construction method for constructing a thermal insulation structure including a thermal insulation layer on plant equipment, and more particularly to a thermal insulation construction method for constructing a thermal insulation structure including a thermal insulation layer on cylindrical plant equipment such as towers and vessels, such as vertical cylindrical tanks, and piping, as well as joints, fittings, or valves. [Background technology]

[0002] In cylindrical plant equipment such as vertical cylindrical towers and vessels, including storage tanks, heat exchangers, and reactors, and piping, which are widely used in chemical plants and the like, it is known to provide an insulating structure by providing an insulating layer or the like on the outer surface to prevent heating by external heat in order to maintain low temperatures for the materials stored or circulating inside (see, for example, Patent Documents 1 and 2).The conventional insulating construction method for constructing an insulating structure involves applying a number of insulating panels, which are pre-formed to fit the outer curvature of the cylindrical plant equipment, to the surface of the cylindrical plant equipment on site, fixing them in place with bands or the like, and then covering the fixed insulating panels with surface-coated metal plates for the purpose of protecting and decorating the insulating panels. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-16806 [Patent Document 2] Japanese Patent Application Publication No. 2018-119634 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional construction methods are labor-intensive and pose many construction problems, such as the need for a large space to store the molded panels at the construction site and the need for a tow truck to lift the molded panels during construction. Even after construction, there are problems, such as the steel plates covering the surface being blown away by typhoons. Furthermore, because the shapes of piping components such as joints, fittings, and valves are complex, insulating them by fixing them with bands or other materials is time-consuming and can sometimes result in insufficient insulation.

[0005] Therefore, an object of the present invention is to provide a thermal insulation construction method that improves construction workability, makes it possible to maintain the condition after construction, and has excellent thermal insulation performance. [Means for solving the problem]

[0006] The present invention is summarized as follows [1] to

[13] . [1] A method of insulating plant equipment, comprising covering at least a portion of the plant equipment with a plate material so as to create a space for injection of a raw material liquid between the plant equipment and the plate material, pouring a raw material liquid of foamed plastic into the space for injection of a raw material liquid, and allowing the raw material liquid to foam and harden while restricting the outward expansion of the plate material, thereby forming an insulating layer. [2] The thermal insulation construction method according to claim 1, wherein the plant equipment is cylindrical, and the method includes the steps of: installing the plate material around the entire circumference of the cylindrical plant equipment while maintaining a certain distance from the outer peripheral surface of the cylindrical plant equipment; and pouring foamed plastic concentrate into the concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the plate material, foaming and hardening the concentrate while restricting the expansion of the plate material in the diameter and circumferential directions, thereby forming an insulating layer. [3] The thermal insulation construction method described in [2], in which the thermal insulation layer is repeatedly formed in the vertical direction of the cylindrical plant equipment. [4] The heat insulation construction method according to [2] or [3], wherein the plate material is either a surface-coated metal plate or a frame plate. [5] The heat insulation construction method according to [4], wherein the plate material is a surface-coated metal plate, and the foamed plastic concentrate is foamed and hardened and integrated with the surface-coated metal plate. [6] A thermal insulation construction method according to [4] or [5], comprising the steps of: installing the frame plate around the entire circumference while maintaining a certain distance from the outer peripheral surface of the cylindrical plant equipment; pouring foamed plastic concentrate into the concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the frame plate, foaming and hardening the concentrate while restricting the expansion of the frame plate in the diameter and circumferential directions, thereby forming an inner peripheral insulation layer; repeating the step of forming the inner peripheral insulation layer once or multiple times, and then installing a surface-coated metal plate around the entire circumference while maintaining a certain distance from the outer peripheral surface of the cylindrical plant equipment; and pouring foamed plastic concentrate between the outer peripheral surface of the cylindrical plant equipment and the surface-coated metal plate, foaming and hardening the concentrate while restricting the expansion of the surface-coated metal plate in the diameter and circumferential directions, thereby forming an outer peripheral insulation layer. [7] The insulation construction method described in [6], in which the frame plate is embedded between the inner periphery insulation materials or between the inner periphery insulation materials and the outer periphery insulation materials. [8] The thermal insulation construction method according to any one of [4] to [6], wherein the frame plate is removed after the inner peripheral insulating layer is formed. [9] A thermal insulation construction method described in any one of [2] to [8], further comprising a step of placing a lower metal plate extending perpendicularly below the lowermost surface-coated metal plate and contacting the outer peripheral surface of the cylindrical plant equipment, in the step of installing the surface-coated metal plate.

[10] The thermal insulation construction method described in any one of [2] to [9], further comprising a step of placing a spacer on the outer peripheral surface of the cylindrical plant equipment to keep the width of the raw liquid injection space constant.

[11] The heat insulation construction method according to any one of [2] to

[10] , wherein the joining structure is such that the peripheral edges of the plate materials are fitted together and joined.

[12] The heat insulation construction method according to any one of [2] to

[11] , further comprising the step of installing a strip material that restricts the expansion of the plate material in the diameter direction and the circumferential direction.

[13] The heat insulation construction method according to any one of [4] to

[12] , wherein the surface-coated metal plate has a rigid urethane foam on one surface thereof.

[14] The thermal insulation construction method according to any one of [2] to

[13] , further comprising the step of placing a resin sheet on the surface of the cylindrical plant equipment.

[15] The thermal insulation construction method according to [1], wherein the plant equipment is a joint, a fitting, or a valve.

[16] The heat insulation construction method according to

[15] , wherein the plate material is any one of a surface-coated metal plate, a frame plate, and a formwork.

[17] The heat insulation construction method according to

[16] , wherein the plate material is a surface-coated metal plate, and the foamed plastic concentrate is foamed and hardened and integrated with the surface-coated metal plate.

[18] The heat insulation construction method according to

[16] or

[17] , wherein the surface-coated metal plate has a foam material on one side.

[19] The heat insulation construction method according to any one of

[15] to

[18] , wherein the outward expansion of the plate is restricted by applying a metal foil tape to the outside of the plate.

[20] The heat insulation construction method according to any one of

[15] to

[18] , further comprising the step of installing a strip material that restrains the outward expansion of the plate material. [Effects of the Invention]

[0007] The present invention can provide a thermal insulation construction method that improves construction workability, makes it possible to maintain the condition after construction, and has excellent thermal insulation performance. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a cylindrical plant equipment having a thermal insulation structure formed by the thermal insulation construction method of the first embodiment. FIG. [Figure 2] FIG. 2 is a schematic diagram for explaining the thermal insulation construction method of the first embodiment. [Figure 3] Figure 3(a) is a schematic oblique view of the joining structure of a surface-coated metal plate used in the insulation construction method of the first embodiment, Figure 3(b) is a schematic top view of the joining structure of a surface-coated metal plate used in the insulation construction method of the first embodiment, and Figure 3(c) is a schematic side view of the joining structure of a surface-coated metal plate used in the insulation construction method of the first embodiment. [Figure 4] FIG. 10 is a cross-sectional view of a cylindrical plant equipment having a thermal insulation structure formed by the thermal insulation construction method of the second embodiment. [Figure 5] FIG. 1 is a schematic diagram (part 1) for explaining the thermal insulation construction method of the second embodiment. [Figure 6] FIG. 2 is a schematic diagram (part 2) for explaining the thermal insulation construction method of the second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a cylindrical plant equipment having a thermal insulation structure formed by a thermal insulation construction method according to a third embodiment. [Figure 8] FIG. 10 is a schematic diagram for explaining a thermal insulation construction method according to a fourth embodiment. [Figure 9] FIG. 10 is a schematic perspective view of a joining structure of surface-coated metal plates used in a thermal insulation construction method according to another embodiment. [Figure 10] FIG. 10 is a schematic perspective view of a joining structure of surface-coated metal plates used in a thermal insulation construction method according to another embodiment. [Figure 11] FIG. 1 is a schematic diagram illustrating an example of a heat insulating construction method when the target of the heat insulating construction method is a flange, and shows an enlarged joint structure. [Figure 12] FIG. 1 is a schematic diagram illustrating an example of a thermal insulation construction method when the target of the thermal insulation construction method is a 90° elbow. [Figure 13] FIG. 1 is a schematic diagram illustrating an example of a thermal insulation method for a valve, in which the joining structure is shown enlarged. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] FIG. 1 shows a thermal insulation structure applied to cylindrical plant equipment 1 by a thermal insulation construction method according to a first embodiment of the present invention. The cylindrical plant equipment 1 stores or circulates liquid inside, and has a cylindrical side wall. The cylindrical plant equipment 1 is, for example, a tank for storing cryogenic liquid such as liquefied natural gas (LNG), liquefied ethylene gas (LEG), or liquefied petroleum gas (LPG). The cylindrical plant equipment 1 is also, for example, a pipe for circulating cryogenic liquid such as LNG, LEG, or LPG. The thermal insulation structure applied to the cylindrical plant equipment 1 is made of a surface-coated metal plate 10 (10a) as a plate material installed around the entire periphery of the side wall of the cylindrical plant equipment 1 at a certain distance from the outer peripheral surface 1A. 11 ,···,10a 18 ) and a heat insulating layer 30 provided between the outer peripheral surface 1A of the side wall of the cylindrical plant equipment 1 and the surface-coated metal plate 10.

[0010] The heat insulating layer 30 may be made of any material that can be used as a heat insulating material, such as urethane foam, phenol foam, or styrene foam, but from the viewpoints of ease of production and hardening speed, urethane foam and phenol foam are preferred, with urethane foam being more preferred. The use of urethane foam tends to improve self-adhesion, foaming properties, heat insulating properties, etc. The thickness of the heat insulating layer 30 is not particularly limited, but is, for example, 5 to 200 mm, preferably 20 to 150 mm, and more preferably 50 to 100 mm.

[0011] The surface-coated metal plate 10 may be any material that can provide protection and decoration to the insulating layer 30, such as a steel plate, iron plate, stainless steel plate, or aluminum plate, but steel plate and iron plate are preferred from the standpoint of mechanical strength and formability. The thickness of the surface-coated metal plate 10 is not particularly limited, but is, for example, 0.27 to 1.6 mm, and preferably 0.4 to 0.8 mm. The height of the surface-coated metal plate 10 is not particularly limited, but for example, if the cylindrical plant equipment 1 is a tower or tank, it is 300 to 1,500 mm, preferably 400 to 1,000 mm, and if the cylindrical plant equipment 1 is a pipe and has a diameter of 26 inches or more, it is 300 to 1,500 mm, and if the diameter is less than 26 inches, it is 300 to 1,000 mm.

[0012] The thermal insulation construction method according to the first embodiment of the present invention will be described in detail below. The thermal insulation construction method according to the first embodiment of the present invention is a thermal insulation construction method for cylindrical plant equipment 1 such as towers, tanks, and piping, and includes the steps of installing a surface-coated metal plate 10 and forming a thermal insulation layer 30.

[0013] 2 shows only a portion of the installation, in the process of installing the surface-coated metal plate 10, the surface-coated metal plate 10 is installed as a plate material around the entire circumference, maintaining a certain distance from the outer peripheral surface 1A of the cylindrical plant equipment 1. The surface-coated metal plate 10 is formed in advance to match the outer curvature of the cylindrical plant equipment 1, and by installing the surface-coated metal plate 10 around the cylindrical plant equipment 1, a stock solution injection space S is formed between the outer peripheral surface 1A of the cylindrical plant equipment 1 and the surface-coated metal plate 10.

[0014] The step of installing the surface-coated metal plates 10 preferably further includes a step of arranging a lower metal plate 12 extending perpendicularly below the lowest surface-coated metal plate 10a1 and in contact with the outer peripheral surface 1A of the cylindrical plant equipment 1, as shown in FIG. 2(b). By arranging the lower metal plate 12 below the surface-coated metal plates 10, the surface-coated metal plates 10 can be installed at a constant distance from the outer peripheral surface 1A of the cylindrical plant equipment 1, using the lower metal plate 12 as a reference. Because the lower ends of the second and subsequent surface-coated metal plates 10 are restricted by the upper end of the lower plate, the distances of the second and subsequent surface-coated metal plates 10 from the outer peripheral surface 1A of the cylindrical plant equipment 1 are also approximately constant. In other words, by arranging the lower metal plate 12 below the lowest surface-coated metal plate 10, the width of the stock solution injection space S determined by the lower metal plate 12 can be maintained for the surface-coated metal plates 10 in the upper stages. The lower metal plate 12 can be formed by cutting it in advance to fit the curvature of the outer peripheral surface 1A of the cylindrical plant equipment 1.

[0015] In a subsequent process, the surface-coated metal plate 10 needs to maintain a certain distance from the outer peripheral surface 1A of the cylindrical plant equipment 1 by suppressing the force of expansion in the diameter direction and the circumference direction that occurs when the foam plastic concentrate poured into the concentrate injection space S foams. Therefore, the surface-coated metal plate 10 is provided with a restraining structure that restrains expansion in the diameter direction and the circumference direction from the outer peripheral surface 1A of the cylindrical plant equipment 1. In this embodiment, the restraining structure is a joining structure in which the ends of adjacent surface-coated metal plates 10 are fitted together to join them. A specific joining structure may be a female-male fitting structure in which male and female parts provided on the respective peripheral portions of adjacent surface-coated metal plates 10 are fitted together, or other members may be used for fitting. As shown in Figs. 3(a) to (c), the bonding structure provided on the peripheral portion of the surface-coated metal plate 10 is 11 ,10a 12 and a J-shaped portion formed by folding back the adjacent ends of the surface-coated metal plate 10a. 11 ,10a 12 The sheath-shaped member 11 can be fitted into and fixed to both J-shaped portions of the surface-coated metal plate 10a. 11 ,10a 12 By fitting vertically with both of the J-shaped portions bent back, the adjacent surface-coated metal plate 10a 11 ,10a 12 The J-shaped member 11 can be firmly fixed to the outer peripheral surface 1A of the cylindrical plant equipment 1, and can be kept at a certain distance from the outer peripheral surface 1A of the cylindrical plant equipment 1. The J-shaped member is not provided at the upper end of the surface-coated metal plate, and the height of the sheath member 11 is set to be equal to or less than the height of the surface-coated metal plate 10a as shown in FIG. 11 ,10a 12 The height of the surface-coated metal plate 10a is lower than that of the surface-coated metal plate 10a. 11 ,10a 12 In this way, the surface-coated metal plate 10a 11 ,10a 12By not providing a fitting structure at the upper end of the surface-coated metal plate 10a 11 ,10a 12 This allows space to be secured at the upper end of the surface-coated metal plate 10, thereby improving the workability of stacking the surface-coated metal plates 10.

[0016] In the process of forming the insulating layer 30, as shown in Figure 2(a), foamed plastic concentrate is poured into the concentrate injection space S between the outer surface 1A of the cylindrical plant equipment 1 and the surface-coated metal plate 10, and is foamed and hardened while restricting the radial and circumferential expansion of the surface-coated metal plate 10, thereby forming the insulating layer 30. The foamed plastic concentrate is supplied to the concentrate injection space S around the entire circumference of the cylindrical plant equipment 1 as the supply device 20 moves circumferentially around the outer circumferential surface 1A of the cylindrical plant equipment 1. The foamed plastic concentrate injected into the concentrate injection space S foams and hardens, and is adhered to and integrated with the outer circumferential surface 1A of the cylindrical plant equipment 1, as well as to the surface-coated metal plate 10. The insulating layer 30 formed by the foamed plastic concentrate is formed to a constant thickness around the entire circumference of the cylindrical plant equipment 1, because the surface-coated metal plate 10 is installed around the entire circumference while maintaining a constant distance from the outer circumferential surface 1A of the cylindrical plant equipment 1.

[0017] After the heat insulating layer 30 is formed, in order to improve weather resistance and waterproofing, it is preferable to seal the gaps between adjacent surface-coated metal plates 10. Examples of sealing materials for sealing the gaps include caulking materials such as silicone caulking materials, mortar, and putty materials.

[0018] The foamed plastic concentrate is supplied from the supply device 20 to the concentrate injection space S, and is a liquid for forming the insulating layer 30. It becomes a foam (insulating layer 30) by foaming and hardening. For example, in the case of urethane foam, the foamed plastic concentrate contains a polyisocyanate component, a polyol component, a blowing agent, a foam stabilizer, a catalyst, etc. Such foamed plastic concentrate is prepared, for example, in the supply device 20, by mixing a polyisocyanate component (second liquid) with a first liquid that is a polyol component blended with a blowing agent, a foam stabilizer, a catalyst, etc.

[0019] The height of one step of the insulating layer 30 formed in this embodiment is usually sufficiently smaller than the vertical height of the cylindrical plant equipment 1. Therefore, one step of the insulating layer 30 formed by the above-described process of forming the insulating layer 30 usually covers only a part of the outer peripheral surface 1A of the cylindrical plant equipment 1. Therefore, in this embodiment, if the heat insulating layer 30 formed by the above-described step of forming the heat insulating layer 30 is one layer, the step of forming the heat insulating layer 30 may be repeated in the vertical direction of the cylindrical plant equipment 1 to form multiple layers of the heat insulating layer 30. Specifically, as shown in FIG. 2(a), 21 , . . . , and a surface-coated metal plate 10a 21 The Z-shaped portion is formed by the surface-coated metal plate 10a used when forming the first heat insulating layer 30. 11 , ...., and then the second insulating layer 30 can be formed after fitting it into the upper end of the cylindrical plant equipment 1. By repeatedly forming multiple insulating layers 30 in this manner in the vertical direction of the cylindrical plant equipment 1, it is possible to form insulating layers 30 over most or substantially all of the area of ​​the outer circumferential surface 1A of the cylindrical plant equipment 1, for example. However, if the cylindrical plant equipment 1 is sufficiently small, the formation of a single layer of the heat insulating layer 30 may be sufficient.

[0020] As described above, in this embodiment, the peripheral insulation layer is formed by injecting the foamed plastic concentrate into the concentrate injection space between the outer surface of the tower / vessel and the surface-coated metal plate maintained at a fixed distance, which allows for highly accurate thickness control and the formation of a peripheral insulation layer with a uniform thickness. Furthermore, the peripheral insulation layer is foamed and hardened during injection molding, thereby bonding with the outer surface of the tower / vessel and the surface-coated metal plate with high adhesive strength, which makes it easier to improve peel strength, interlayer strength, mechanical strength, etc., and significantly reduces the risk of the surface-coated metal plate peeling off due to strong winds, etc. In addition, by forming the outer perimeter insulation layer by injecting foamed plastic concentrate on-site without using insulation panels, panel joints that are seen in conventional construction methods are eliminated, and the work of gluing the insulation panels together and sealing the joints can be eliminated. Furthermore, because the outer perimeter insulation layer of this embodiment has no joints, the risk of thermal short circuits is significantly reduced. In addition, since the foamed plastic concentrate can be delivered to the site and installed instead of using foam, the volume of transportation and on-site stock is extremely small. Therefore, on-site installation is possible with good workability, while the performance of the heat-insulating structure is excellent. Furthermore, since the foamed plastic concentrate is injected on-site, the liquid foamed plastic concentrate can be pumped, eliminating the labor and equipment required to unload bulky molded panels.

[0021] [Second embodiment] Next, a thermal insulation construction method according to a second embodiment of the present invention will be described with reference to Figure 4. In the following description, differences from the first embodiment will be mainly described, but explanations of the same configuration as the first embodiment will be omitted. Furthermore, the same reference numerals will be used to designate components with the same configuration. In the first embodiment, the outer wall surface of the cylindrical plant equipment 1 is the outer peripheral surface 1A of the cylindrical plant equipment 1, and an insulating layer 30 is formed on the outer peripheral surface 1A. In the second embodiment, as shown in Figure 5, after an inner peripheral insulating layer 60 is formed on the outer wall surface of the cylindrical plant equipment 1, as shown in Figure 6, the outermost layer of the formed inner peripheral insulating layers 60 is regarded as the outer peripheral surface 1B of the cylindrical plant equipment 1, and an outer peripheral insulating layer 61 is formed on the outer peripheral surface 1B.

[0022] More specifically, as shown in FIG. 5, a frame plate 50 (50a) is attached as a plate around the entire periphery of the cylindrical plant equipment 1 while maintaining a certain distance from the outer circumferential surface 1A of the cylindrical plant equipment 1. 11 ,···,50a 1n As a result, a stock solution injection space S is formed, which is partitioned by the outer peripheral surface 1A of the cylindrical plant equipment 1 and the frame plate 50. The frame plate 50 is not particularly limited as long as it functions as a formwork when forming the inner heat insulating layer 60, and examples thereof include a resin plate containing at least one of polycarbonate resin, acrylic resin, and acrylonitrile-butadiene-styrene resin, and a metal plate such as a steel plate or an iron plate. When the frame plate 50 is embedded in the inner heat insulating layer 60 or the outer heat insulating layer 61, it is preferably a resin plate. The frame plate 50 may be embedded in the inner periphery insulation layer 60 or the outer periphery insulation layer 61 without being removed after the inner periphery insulation layer 60 has been formed inside the frame plate 50, by going through the process of forming the inner periphery insulation layer 60 or the outer periphery insulation layer 61. When the frame plate 50 is to be removed after the inner periphery insulation layer 60 has been formed, the above-mentioned resin plate or metal plate may be one in which at least the surface that comes into contact with the inner periphery insulation layer 60 has been treated with a release agent such as silicone resin, and from the viewpoints of processability that allows free processing and cost reduction, a steel plate that has been treated with a release agent is preferred.

[0023] It is preferable that the frame plate 50 maintain a constant distance from the outer peripheral surface 1A of the cylindrical plant equipment 1 by suppressing the force of expansion in the diameter direction and the circumference direction that occurs when the foamed plastic concentrate poured into the concentrate injection space S foams in a subsequent process. Therefore, in order to maintain a constant distance from the outer peripheral surface 1A of the cylindrical plant equipment 1, a band material 51 is installed on the outer periphery of the frame plate 50 as shown in FIG. 5 as a restraining structure that suppresses the force of expansion in the diameter direction and the circumference direction. The band material 51 is preferably a band-shaped member that can at least secure adjacent frame plates 50 together, but is preferably a band-shaped member that is installed around the entire outer periphery of the installed frame plates 50. Examples of the band material 51 include a steel band and a tie-down band.

[0024] In the process of forming the inner insulating layer 60, as shown in Figure 5, foamed plastic concentrate is poured into the concentrate injection space S between the outer surface 1A of the cylindrical plant equipment 1 and the frame plate 50, and the concentrate is foamed and hardened while restricting the expansion of the frame plate 50 in the diameter and circumferential directions, thereby forming the inner insulating layer 60. The foamed plastic concentrate is supplied to the concentrate injection space S around the entire circumference of the cylindrical plant equipment 1 as the supply device 20 moves circumferentially around the outer circumferential surface 1A of the cylindrical plant equipment 1. The foamed plastic concentrate injected into the concentrate injection space S foams and hardens, and is bonded to and integrated with the outer circumferential surface 1A of the cylindrical plant equipment 1. The inner peripheral insulating layer 60 formed by the foamed plastic concentrate suppresses the force of the frame plate 50 expanding in the diameter and circumferential directions and is installed around the entire circumference while maintaining a constant distance from the outer circumferential surface 1A of the cylindrical plant equipment 1, so that it is formed to a constant thickness around the entire circumference of the cylindrical plant equipment 1.

[0025] The height of one step of the inner periphery insulation layer 60 formed in this embodiment is usually sufficiently smaller than the vertical height of the cylindrical plant equipment 1. Therefore, the one step of the inner periphery insulation layer 60 formed by the process of forming the inner periphery insulation layer 60 described above usually covers only a part of the outer peripheral surface 1A of the cylindrical plant equipment 1. Therefore, in this embodiment, if the inner peripheral insulation layer 60 formed by the above-described step of forming the inner peripheral insulation layer 60 is one layer, the step of forming the inner peripheral insulation layer 60 may be repeated in the vertical direction of the cylindrical plant equipment 1 to form multiple layers of the inner peripheral insulation layer 60. Specifically, a frame plate 50 for forming the second layer, having a Z-shaped portion formed by folding the lower end twice, is prepared, and the Z-shaped portion of the frame material 50 for forming the second layer is folded over the frame plate 50 used when forming the first layer of the inner peripheral insulation layer 60. 11 , ...., and then the second-stage inner peripheral insulation layer 60 can be formed after fitting it into the upper end of the cylindrical plant equipment 1. By repeatedly forming multiple stages of inner peripheral insulation layers 60 in this manner in the vertical direction of the cylindrical plant equipment 1, it is possible to form the insulation layer 30 over most or substantially all of the area of ​​the outer peripheral surface 1A of the cylindrical plant equipment 1, for example. However, if the cylindrical plant equipment 1 is sufficiently small, the inner peripheral insulating layer 60 may be formed in one stage.

[0026] When forming multiple layers of inner insulation layers 60, if the most recently formed inner insulation layer 60 or frame plate 50 is not removed, the outer surface of the frame plate 50 is regarded as the outer surface 1B of the cylindrical plant equipment 1, and the process of installing the frame plate 50 around the entire circumference while maintaining a certain distance from the outer surface 1B and the process of forming the inner insulation layer 60 are repeated.

[0027] As shown in Figure 6, after the formation of the inner peripheral insulation layer 60 is completed, if the outermost layer of the formed inner peripheral insulation layer 60 or the frame plate 50 is not removed, the outer frame plate 50 is considered to be the outer peripheral surface 1B of the cylindrical plant equipment 1, and an outer peripheral insulation layer 61 is formed on the outer peripheral surface 1B. Although FIG. 6 shows only a portion of the installation, in the process of installing the surface-coated metal plate 10, the surface-coated metal plate 10 is installed over the entire circumference while maintaining a certain distance from the outer peripheral surface 1B of the cylindrical plant equipment 1. In the process of forming the outer peripheral insulation layer 61, a foamed plastic concentrate is poured into the concentrate injection space S between the outer peripheral surface 1B of the cylindrical plant equipment 1 and the surface-coated metal plate 10, and is foamed and hardened while restricting the expansion of the surface-coated metal plate 10 in the diameter and circumferential directions, to form the outer peripheral insulation layer 61. The foamed plastic concentrate injected into the concentrate injection space S is foamed and hardened, and is bonded to and integrated with the inner peripheral insulation layer 60 or frame plate 50 as the outer peripheral surface 1B of the cylindrical plant equipment 1, and is also bonded to and integrated with the surface-coated metal plate 10.

[0028] As described above, in this embodiment, by providing an inner peripheral insulation layer to form multiple insulation layers, it becomes easy to adjust the thickness of the insulation layer, and an insulation structure with excellent insulation properties can be provided to towers and vessels of vertical cylindrical tanks.

[0029] [Third embodiment] Next, a heat insulation construction method according to a third embodiment of the present invention will be described with reference to Fig. 7. In the following description, differences from the first embodiment will be mainly described, but explanations of the same configuration as the first embodiment will be omitted. Furthermore, the same reference numerals will be used to designate components having the same configuration. In the first embodiment, the surface of the cylindrical plant equipment 1 is the outer peripheral surface 1A of the cylindrical plant equipment 1, and an insulating layer 30 is formed on the outer peripheral surface 1A, but in the third embodiment, a resin sheet 70 is installed on the surface of the cylindrical plant equipment 1, and then an insulating layer 30 is formed on the installed resin sheet 70.

[0030] The resin sheet 70 is temporarily fixed to the surface of the cylindrical plant equipment 1 with adhesive tape or the like. The resin sheet 70 is placed between the surface of the cylindrical plant equipment 1 and the insulating layer 30, thereby preventing adhesion between the surface of the cylindrical plant equipment 1 and the insulating layer 30. The resin sheet 70 can also reduce stress within the outer peripheral insulating layer 30 that occurs due to the difference in linear expansion coefficient between the surface of the cylindrical plant equipment 1, which is made of metal, and the insulating layer 30, and can suppress the occurrence of cracks in the insulating layer 30 due to the effects of differences in contraction due to temperature on the surface of the cylindrical plant equipment 1 and the expansion or contraction of the cylindrical plant equipment 1 due to an increase or decrease in the contents. The resin sheet 70 may be any material that has the function of preventing adhesion between the surface of the cylindrical plant equipment 1 and the heat insulating layer 30, is liquid-tight so as to prevent penetration of the foamed plastic concentrate, and is flexible enough not to restrict the movement of the foamed plastic after hardening. Examples of materials that can be used to form the resin sheet 70 include polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, acrylic resin, polystyrene resin, and melamine resin, with polyethylene resin being preferred from the standpoints of availability and cost reduction.

[0031] It is preferable to further install inorganic fibers as a buffer material between the resin sheet 70 and the surface of the cylindrical plant equipment 1 in order to minimize the transmission of movements such as expansion or contraction of the cylindrical plant equipment 1 to the insulating layer 30. Examples of inorganic fibers include glass wool, rock wool, ceramic wool, gypsum fiber, carbon fiber, stainless steel fiber, slag fiber, silica alumina fiber, alumina fiber, silica fiber, and zirconia fiber. One or more types of inorganic fibers can be used as the buffer material. Among these, glass wool is preferred as the inorganic fiber from the viewpoints of workability and weight reduction.

[0032] As described above, in this embodiment, by providing a resin sheet between the surface of the cylindrical plant equipment and the insulating layer, cracks that occur when the insulating layer follows the expansion and contraction of the cylindrical plant equipment when the surface of the cylindrical plant equipment expands and contracts due to the temperature of the contents, or when the cylindrical plant equipment itself expands or contracts due to an increase or decrease in the contents of the cylindrical plant equipment, can be suppressed. Furthermore, the provision of the resin sheet makes it easier to peel off the heat insulating layer when repairing it.

[0033] [Fourth embodiment] Next, a thermal insulation construction method according to a fourth embodiment of the present invention will be described with reference to Fig. 8. In the following description, differences from the first embodiment will be mainly described, but explanations of the same configuration as the first embodiment will be omitted. Furthermore, the same reference numerals will be used to designate components with the same configuration. In the first embodiment, the lower metal plate 12 is arranged to keep the distance of the surface-coated metal plate 10 from the outer peripheral surface 1A of the cylindrical plant equipment 1 constant, but in the fourth embodiment, a spacer 40 is arranged.

[0034] It is preferable to further include a step of arranging spacers 40 on the outer peripheral surface 1A of the cylindrical plant equipment 1 to keep the width of the raw material injection space S constant. By arranging the spacers 40 on the outer peripheral surface 1A of the cylindrical plant equipment 1 and then installing the surface-coated metal plate 10, the surface-coated metal plate 10 can be installed at a constant distance from the outer peripheral surface 1A of the cylindrical plant equipment 1 using the spacers 40 as a reference. The spacer 40 may be removed after the process of installing the surface-coated metal plate 10, or it may be embedded in the insulation layer 30 by going through the process of forming the insulation layer 30 without removing it after installing the surface-coated metal plate 10.

[0035] The material for the spacer 40 is not particularly limited as long as it can maintain a shape that keeps the width of the raw liquid injection space S constant, and examples include resin foam, rubber foam, resin, and metal. Examples of materials for the resin foam include polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, acrylic resin, polystyrene resin, and melamine resin. One or more types of resin foam can be used. Among these, polyurethane resin is preferred as the material for the resin foam from the viewpoints of mechanical strength, weight reduction, heat insulation when buried, and heat resistance against reaction heat. Examples of materials for the rubber foam include natural rubber, isoprene rubber, butadiene rubber, 1,2-polybutadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, chlorinated butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM), chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, multi-vulcanized rubber, non-vulcanized rubber, silicone rubber, fluororubber, and urethane rubber. One or more types of rubber foam may be used. Examples of the resin include polyethylene, polypropylene, and polybutene. Metals include iron, steel, and aluminum.

[0036] (Other embodiments) The thermal insulation construction method described above by showing the embodiments is one example of the present invention, and the present invention is not limited to the configuration of the above embodiments. Various improvements and modifications are possible within the scope that does not deviate from the spirit of the present invention, and components may be added as appropriate. For example, in the above explanation, the structure of Figure 3 was shown as a joining structure provided on the edge portion of the surface-coated metal plate 10 as a restraint structure, but this is not limited to this.An example is a structure in which the entire area of ​​the adjacent ends of the surface-coated metal plates 10c1 and 10c2 are bent so as to fold back, and J-shaped portions are fitted together to join them, as shown in Figure 9. Furthermore, the joining structure does not need to be a fitting structure, and any joining structure may be used as long as it can join the edge portions together or fix the edge portions together via other members that join to each edge portion.

[0037] In addition, in each of the above embodiments, the surface-coated metal plate 10 is restrained from expanding in the diametric and circumferential directions due to foaming pressure by a joining structure in which the ends of adjacent surface-coated metal plates 10 are fitted together to join them as a restraining structure. However, a strip material may be provided on the outer periphery of the surface-coated metal plate 10 to restrain expansion in the diametric and circumferential directions due to foaming pressure. The strip material may be the same as that described in the second embodiment. The strip material may be used alone or in combination with the joining structure described above. Furthermore, although a joining structure and a strip material have been described as examples of structures for restraining the surface-coated metal plate 10 and the frame plate 50 (i.e., the plate material), other materials may be used as long as they are capable of restraining the expansion in the diameter and circumferential directions due to the foaming pressure.

[0038] Furthermore, when forming multiple layers of thermal insulation layers 30 repeatedly in the vertical direction of the cylindrical plant equipment 1, as described above, the multiple surface-coated metal plates are connected in the vertical direction by fitting the upper and lower ends of the surface-coated metal plates using a Z-shaped member, but the fitting of the upper and lower ends may be performed using a fitting structure other than a Z-shaped member. Note that, as shown in FIG. 2, the fitting structure is preferably a structure in which a female part (e.g., a Z-shaped member) is provided at the lower end and the upper end of the surface-coated metal plate is fitted into the female part as a male part, but the lower end may also be the male part. Furthermore, the multiple surface-coated metal plates may be connected in the vertical direction using a structure other than a fitting structure.

[0039] 10, the surface-coated metal plates 10d1 and 10d2 may be rigid urethane panels having rigid urethane foam 80 on one side. By using rigid urethane panels as the surface-coated metal plates 10d1 and 10d2, the rigid urethane foam 80 already provided thereon can function as the insulating layer 30, making it possible to reduce the thickness of the insulating layer 30 and shortening the work time on site. The thickness of the rigid urethane foam 80 is not particularly limited, but is, for example, 10 to 100 mm, and preferably 20 to 50 mm.

[0040] Furthermore, in the above third embodiment, the resin sheet 70 is installed between the surface of the cylindrical plant equipment 1 and the insulating layer 30, but this is not limited to this, and it may also be installed between the surface of the cylindrical plant equipment 1 and the inner insulating layer 60 shown in the above second embodiment.

[0041] Furthermore, in each of the above embodiments, towers, tanks, and piping have been described as examples of cylindrical plant equipment 1, but the cylindrical plant equipment 1 is not particularly limited as long as it is a vertical cylindrical device, and may be a storage device, a heat exchanger, a reactor, etc.

[0042] [Variations] The thermal insulation construction method of the above embodiment can be modified as follows. (Variation 1) The thermal insulation construction method of the above embodiment is directed to cylindrical plant equipment. However, the thermal insulation construction method of the present invention is not particularly limited to any plant equipment. The plant equipment is not particularly limited as long as it is an element that constitutes a plant. For example, the thermal insulation construction method of the present invention may be applied to a joint (joint). A joint is a portion where piping components are joined together. Examples of joints include welds, flanges, and threaded joints. Because convex portions are formed at these locations, forming an insulating layer using a strip of material can result in gaps between the insulating layer and the joint, resulting in insufficient thermal insulation performance. Furthermore, in order to prevent the formation of gaps between the insulating layer and the joint, the strip of material must be processed to fit the shape of the joint, which takes time for construction. However, the thermal insulation construction method of the present invention can easily prevent the formation of gaps between the insulating layer and the joint, making it possible to construct an insulating layer with excellent thermal insulation performance at the joint with good workability.

[0043] An example of a thermal insulation construction method in which the target of the thermal insulation construction method is a flange as an example of a joint will be described with reference to Fig. 11. The following description will focus on differences from the embodiment of the cylindrical plant equipment described above. Inorganic fibers 90, such as glass wool, are wrapped around the piping surface of the piping, including the flange 100. The glass wool 90 acts as an insulator and also as a buffer to suppress stress caused by the difference in thermal expansion coefficient between the piping and the insulating material. A resin sheet 70, such as a polyethylene sheet, is then attached to the inorganic fibers 90. The resin sheet 70 prevents the foamed plastic concentrate from penetrating into the inorganic fibers 90. If the foamed plastic concentrate penetrates the inorganic fibers 90, the inorganic fibers harden, reducing their function as a buffer. The flange 100 is then covered with a surface-coated metal plate 10 to create a space between the flange 100 and the metal plate for injecting the concentrate. The surface-coated metal plate 10 is assembled, for example, by joining the peripheral edges of the metal plates together using a joining structure formed by bending and fastening them. This effectively prevents the surface-coated metal plate 10 from expanding outward. Furthermore, it is preferable to restrict the outward expansion of the surface-coated metal sheet 10 by attaching a metal foil tape (not shown) such as aluminum foil tape or stainless steel foil tape to the surface-coated metal sheet 10. It is also preferable to seal gaps in the joining structure of the surface-coated metal sheet 10 with, for example, a caulking material 17.

[0044] Although not shown, the surface-coated metal plate 10 may have a foam material such as a rigid urethane foam on one surface (inner peripheral surface). Furthermore, to prevent the foam plastic concentrate from leaking from the surface-coated metal plate 10 and the foam material, a resin sheet such as a polyethylene sheet may be attached to the foam material.

[0045] Then, while the outward expansion is restrained as described above, the foamed plastic concentrate is poured into the concentrate injection space from the injection port 15 provided at the top of the surface-coated metal plate 10, the injection port 15 provided at the bottom, and an injection port (not shown) provided diagonally to the side, etc., and the foamed plastic concentrate is foamed and hardened while restraining the outward expansion of the surface-coated metal plate 10, thereby forming the insulating layer 30.

[0046] However, in this modification, instead of using the surface-coated metal plate 10, the flange may be covered with a frame plate (e.g., a metal plate, a hard resin material, etc.) so as to create a space between the flange and the frame plate for injecting the concentrate, and the concentrate for the foamed plastic may be poured into the space through an injection port provided in the frame plate, and the concentrate may be foamed and hardened while restricting the expansion of the frame plate outward to form a heat insulating layer. After that, the frame plate may be removed, and a surface-coated metal plate may be placed on top of the heat insulating layer.

[0047] Alternatively, the flange may be covered with a formwork (e.g., rigid urethane foam) to create a space between the flange and the formwork for injecting the concentrate, and the concentrate for the foamed plastic may be poured into the space through an inlet provided in the formwork, allowing the concentrate to foam and harden while restricting the expansion of the formwork outward, thereby forming a heat insulating layer. After that, a surface-coated metal plate may be placed on the formwork.

[0048] The straight pipe portion may be insulated using artificial mineral fiber insulation material conforming to JIS A 9504, inorganic porous insulation material conforming to JIS A 9510, foamed plastic insulation material conforming to JIS A 9511, or insulation material of equal or higher quality than these. For example, the straight pipe portion may be wrapped with rigid urethane foam. The end of the insulation material used to insulate the straight pipe may be disposed on the inner periphery of the surface-coated metal plate 10 or the frame material. The same applies to Modifications 2 and 3 described below.

[0049] (Variation 2) In the case of plant equipment, the insulation construction method of the present invention may be applied to fittings (pipe joints). Fittings are used when bending, merging, branching, changing the diameter of a pipe, or blocking a pipe. Examples of fittings used to bend a pipe include elbows, bends, and miter bends. Examples of fittings used to merge or branch a pipe include welded tees and prefabricated tees. Examples of fittings used to change the diameter include concentric reducers and eccentric reducers. Examples of fittings used to block a pipe include caps. Because the shapes of these parts are not simple, forming an insulation layer using a strip of material can result in gaps between the insulation layer and the fitting, resulting in insufficient insulation performance. Furthermore, to prevent gaps from occurring between the insulation layer and the fitting, the strip must be processed to fit the shape of the fitting, which requires time for construction. However, according to the insulation construction method of the present invention, the occurrence of gaps between the fitting and the insulation layer can be easily suppressed, and an insulation layer with excellent insulation performance can be constructed on the fitting with good workability.

[0050] An example of the thermal insulation construction method when the target of the thermal insulation construction method is a 90° elbow, which is an example of a fitting, will be described with reference to Fig. 12. Note that the following explanation will focus on differences from the embodiment of the cylindrical plant equipment described above. Inorganic fiber 90 such as glass wool is wrapped around the piping surface including the 90° elbow 200. A resin sheet 70 such as a polyethylene sheet is then attached to the inorganic fiber 90. The flange 100 is then covered with a surface-coated metal plate 10 to create a space between the flange 100 and the fitting 200 for injecting the concentrate. The surface-coated metal plate 10 may have a foam material 80 such as rigid urethane foam on one side. A resin sheet such as a polyethylene sheet may be attached to the foam material 80 to prevent the foamed plastic concentrate from leaking from the surface-coated metal plate 10 and the foam material 80. The surface-coated metal plate 10 is preferably restricted from expanding outward by a band material 51 such as a steel band or a polypropylene (PP) band. A miter bend (lobster joint) with a diameter larger than that of the 90° elbow 200 may also be used as the surface-coated metal plate 10. Then, foamed plastic concentrate is poured into the concentrate injection space from the injection port 15 provided on the top of the surface-coated metal plate 10 and the injection port 15 provided on the side, and the foamed plastic is foamed and hardened while restraining the outward expansion of the surface-coated metal plate 10, thereby forming the insulating layer 30.

[0051] However, instead of using the surface-coated metal plate 10, the 90° elbow may be covered with a formwork (e.g., a metal plate, a hard resin material, etc.) to create a space for injecting the foamed plastic into the formwork. The foamed plastic is poured into the space through an inlet provided in the formwork, and the foam is allowed to foam and harden while restricting the expansion outward of the formwork, thereby forming an insulating layer. The formwork may then be removed, and a surface-coated metal plate may be placed on top of the insulating layer. Alternatively, the insulating layer may be wrapped with aluminum butyl tape to provide a moisture-proofing treatment, and the surface-coated metal plate may be placed around the outer periphery of the insulating layer.

[0052] Alternatively, the 90° elbow may be covered with a formwork (for example, rigid urethane foam) to create a space between the 90° elbow and the foamed plastic concentrate, which is poured into the space through an injection port in the formwork, and allowed to foam and harden while restricting the expansion of the formwork outward, forming a heat insulating layer. A surface-coated metal plate may then be placed on top of the formwork.

[0053] (Variation 3) The thermal insulation construction method of the present invention can be applied to plant equipment such as valves. Valves allow fluids to flow, stop fluids, and change the flow rate. Because valves have complex shapes, forming an insulating layer using a strip of material can result in gaps between the insulating layer and the valve, resulting in insufficient thermal insulation performance. Furthermore, to prevent gaps from forming between the insulating layer and the valve, the strip must be processed to fit the shape of the valve, which takes time for construction. However, the thermal insulation construction method of the present invention can easily prevent gaps from forming between the valve and the insulating layer, allowing for easy construction of an insulating layer with excellent thermal insulation performance on the fitting.

[0054] An example of a thermal insulation construction method for a valve will be described with reference to Fig. 13. The following description will focus on differences from the embodiment of the cylindrical plant equipment described above. Inorganic fibers 90 such as glass wool are wrapped around the piping surfaces of the piping, including the valve cover 310 and valve box 320 of the valve 300. A resin sheet 70 such as a polyethylene sheet is then attached onto the inorganic fibers 90. Next, the valve cover 310 and valve box 320 of the valve 300 are covered with a surface-coated metal plate 10 to create a space for injecting the concentrate between the valve cover 310 and valve box 320. The surface-coated metal plate 10 is, for example, a box assembled by joining metal plates together through bending and fastening, with a hole for passing piping or the like. Alternatively, the box body may be formed by assembling two divided pieces with a hole for passing piping or the like. By forming the surface-coated metal plate 10 as a box body, it is preferable to restrict outward expansion. Note that caulking material 17 may be used to seal gaps in the surface-coated metal plate 10 and the gap between the valve 300 and the surface-coated metal plate 10.

[0055] The surface-coated metal sheet 10 may be prevented from spreading outward by applying a metal foil tape such as aluminum foil tape or stainless steel foil tape to the outside of the surface-coated metal sheet 10. Then, foamed plastic concentrate is poured into the concentrate injection space from injection ports 15 provided at the top and bottom of the surface-coated metal sheet 10, and injection ports (not shown) provided diagonally to the side, and foamed and hardened while restricting the outward spread of the surface-coated metal sheet 10, thereby forming the heat-insulating layer 30.

[0056] However, instead of using the surface-coated metal plate 10, a part of the valve (for example, the valve cover and valve box) may be covered with a frame plate (for example, a metal plate, a hard resin material, etc.) so as to leave a space between the valve and the frame plate for injecting the concentrate, and the concentrate is poured into the space from an injection port provided in the frame plate, allowing the concentrate to foam and harden while restricting the expansion of the frame plate outward, thereby forming an insulating layer. The frame plate may then be removed, and a surface-coated metal plate may be placed on top of the insulating layer.

[0057] Alternatively, a part of the valve may be covered with a form (for example, a foam material such as rigid urethane foam) to create a space between the valve and the form, and the foamed plastic concentrate is poured into the space through an injection port provided in the form, and the foam is allowed to harden while restricting the expansion of the form outward, forming a heat insulating layer. After that, a surface-coated metal plate may be placed on the form.

[0058] The foam material used in the above-described modified example is not limited to rigid urethane foam. The foam material used in the above-described modified example is preferably a foamed plastic insulation material conforming to JIS A 9511 or a foamed plastic insulation material of equivalent or higher quality. Examples of foamed plastic insulation materials conforming to JIS A 9511 include rigid urethane foam insulation, polystyrene foam insulation, polyethylene foam insulation, and phenolic foam insulation.

[0059] It should be noted that the above embodiment and the above modification are merely examples of the thermal insulation construction method of the present invention, and therefore the above embodiment and the above modification do not limit the thermal insulation construction method of the present invention. [Explanation of symbols]

[0060] 1 Cylindrical plant equipment 1A,1B Outer surface 10 Surface coated metal plate 11 Sheath-shaped member 12 Lower sheet metal 15 Inlet 17 Caulking material 20 Feeding device 30 Insulation layer 40 spacer 50 Frame board 51 Belt material 60 Inner insulation layer 61 Peripheral insulation layer 70 Resin Sheet 80 Hard urethane foam (foam material) 90 Inorganic Fibers 100 flange 200 90° elbow 300 valves 310 Valve cover 320 Valve box

Claims

1. A thermal insulation construction method for plant equipment, the plant equipment is a joint, a fitting, or a valve; a step of covering at least a part of the plant equipment with a surface-coated metal plate so as to form a space for injecting the raw material solution between the surface-coated metal plate and an outer surface of the plant equipment; applying a metal foil tape or strip around the periphery of the coated metal sheet to restrict outward expansion of the coated metal sheet; and a step of pouring foamed plastic concentrate into the concentrate injection space between the outer surface of the plant equipment and the surface-coated metal plate, foaming and hardening the concentrate, and forming an insulating layer integrated with the outer surface of the plant equipment and the surface-coated metal plate.

2. The thermal insulation construction method according to claim 1 , wherein the surface-coated metal plate has a foam material on one surface thereof.

3. A thermal insulation construction method for plant equipment, At least a part of the plant equipment is covered with a plate material so as to create a space for injection of a raw material solution between the plant equipment and the plate material, and a foamed plastic raw material solution is poured into the space for injection of a raw material solution, and the foamed plastic raw material solution is foamed and hardened while restricting the outward expansion of the plate material, thereby forming a heat insulating layer; The plant equipment is cylindrical plant equipment, a step of placing the plate material around the entire circumference of the cylindrical plant equipment while maintaining a fixed distance from the outer circumferential surface of the cylindrical plant equipment; and a step of pouring a foamed plastic concentrate into a concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the plate material, and foaming and hardening the concentrate while restricting the expansion of the plate material in the diameter direction and the circumferential direction, thereby forming a heat insulating layer. The plate material is either a surface-coated metal plate or a frame plate, a step of installing the frame plate around the entire circumference of the cylindrical plant equipment while maintaining a certain distance from the outer circumferential surface of the cylindrical plant equipment; a step of pouring a foamed plastic concentrate into a concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the frame plate, and foaming and hardening the concentrate while restricting the expansion of the frame plate in the diameter direction and the circumferential direction, thereby forming an inner peripheral insulating layer; a step of repeating the step of forming the inner peripheral heat insulating layer one or more times, and then installing a surface-coated metal plate around the entire circumference while maintaining a certain distance from the outer peripheral surface of the cylindrical plant equipment; The insulation construction method further includes a step of pouring a foamed plastic concentrate between the outer peripheral surface of the cylindrical plant equipment and the surface-coated metal plate, foaming and hardening the concentrate while restricting the expansion of the surface-coated metal plate in the diameter and circumferential directions, thereby forming an outer peripheral insulation layer.

4. A thermal insulation construction method for plant equipment, At least a part of the plant equipment is covered with a plate material so as to create a space for injection of a raw material solution between the plant equipment and the plate material, and a foamed plastic raw material solution is poured into the space for injection of a raw material solution, and the foamed plastic raw material solution is foamed and hardened while restricting the outward expansion of the plate material, thereby forming a heat insulating layer; The plant equipment is cylindrical plant equipment, a step of placing the plate material around the entire circumference of the cylindrical plant equipment while maintaining a fixed distance from the outer circumferential surface of the cylindrical plant equipment; and a step of pouring a foamed plastic concentrate into a concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the plate material, and foaming and hardening the concentrate while restricting the expansion of the plate material in the diameter direction and the circumferential direction, thereby forming a heat insulating layer. The plate material is either a surface-coated metal plate or a frame plate, The step of installing the surface-coated metal plates further includes a step of placing a lower metal plate extending perpendicularly below the lowermost surface-coated metal plate and in contact with the outer peripheral surface of the cylindrical plant equipment.

5. A thermal insulation construction method for plant equipment, The plant equipment is cylindrical plant equipment, a step of placing a plate material around the entire circumference of the cylindrical plant equipment while maintaining a certain distance from the outer circumferential surface of the cylindrical plant equipment; a step of placing a strip material that restricts the expansion of the plate material in the diametric and circumferential directions; and a step of pouring foamed plastic concentrate into the concentrate injection space between the outer surface of the plant equipment and the plate material, foaming and hardening the concentrate, and forming an insulating layer integrated with the outer surface of the plant equipment or the plate material.

6. 6. The thermal insulation construction method according to claim 5, wherein the plate material is either a surface-coated metal plate or a frame plate.

7. a step of installing the frame plate around the entire circumference of the cylindrical plant equipment while maintaining a certain distance from the outer circumferential surface of the cylindrical plant equipment; a step of pouring a foamed plastic concentrate into a concentrate injection space between the outer peripheral surface of the cylindrical plant equipment and the frame plate, and foaming and hardening the concentrate while restricting the expansion of the frame plate in the diameter direction and the circumferential direction, thereby forming an inner peripheral insulating layer; a step of repeating the step of forming the inner peripheral heat insulating layer one or more times, and then installing a surface-coated metal plate around the entire circumference while maintaining a certain distance from the outer peripheral surface of the cylindrical plant equipment; 7. The thermal insulation construction method according to claim 4, further comprising the step of pouring a foamed plastic concentrate between the outer peripheral surface of the cylindrical plant equipment and the surface-coated metal plate, foaming and hardening the concentrate while restricting the radial and circumferential expansion of the surface-coated metal plate, thereby forming an outer peripheral insulation layer.

8. The thermal insulation construction method according to any one of claims 3 to 7, wherein the thermal insulation layers are repeatedly formed in the vertical direction of the cylindrical plant equipment.

9. 7. The heat insulation construction method according to claim 3, 4 or 6, wherein the plate material is a surface-coated metal plate, and the foamed plastic concentrate is foamed, hardened and integrated with the surface-coated metal plate.

10. 8. The thermal insulation construction method according to claim 3 or 7, wherein the frame plate is embedded between the inner peripheral insulation layers or between the inner peripheral insulation layer and the outer peripheral insulation layer.

11. 8. The thermal insulation construction method according to claim 3 or 7, wherein the frame plate is removed after the inner peripheral insulating layer is formed.

12. The thermal insulation construction method according to any one of claims 3, 4, 6, 7 and 9 to 11, wherein the step of installing the surface-coated metal plates further comprises a step of arranging a lower metal plate that extends in the perpendicular direction below the lowermost surface-coated metal plate and contacts the outer peripheral surface of the cylindrical plant equipment.

13. The thermal insulation construction method according to any one of claims 3 to 12, further comprising a step of arranging a spacer on the outer peripheral surface of the cylindrical plant equipment to make the width of the raw solution injection space constant.

14. The heat insulation construction method according to any one of claims 3 to 7 and 9 to 11, wherein the joining structure is such that the peripheral edges of the plate materials are fitted together and joined.

15. 7. The thermal insulation construction method according to claim 3, 4 or 6, wherein the surface-coated metal plate has a rigid urethane foam on one surface thereof.

16. The thermal insulation construction method according to any one of claims 3 to 13 and 15, further comprising a step of installing a resin sheet on the surface of the cylindrical plant equipment.

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