Heat-insulating block structure for skid posts and its construction method

Abstract

To provide an insulation block structure for a skid post, which can suppress the rotation of a constructed insulation block, and a construction method thereof.SOLUTION: An insulation block structure 2 for a skid post consists of a combination of three types of insulation blocks of: a lowermost insulation block 3 which is arranged on the lowermost stage; a middle stage insulation block 4 which is stacked at least one stage on the lowermost insulation block; and a top stage insulation block 5 which is arranged on the uppermost middle stage insulation block 4. The insulation block structure is stacked around a skid post 11. The lowermost insulation block has a recess in the center of the upper surface and convex parts at both ends. The middle stage insulation block has recesses in the center of the upper and lower surfaces and convex parts at both ends. The uppermost insulation block has a recess in the center of the lower surface and convex parts at both ends. The convex parts of the two adjacent lowermost insulation blocks fit into the recess on the lower surface of the lowermost middle stage insulation block. The convex parts of the upper surfaces of the two adjacent uppermost middle insulation blocks fit into the recesses of the uppermost insulation blocks.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat insulating block structure for a skid post, which is constructed around a skid post in a skid pipe that constitutes the walking beam of a heating furnace, and a method for constructing the same. [Background technology]

[0002] As conceptually shown in FIG. 7, a skid pipe 1 constituting the walking beam of a heating furnace is made up of multiple skid posts 11 extending vertically and one skid beam 12 extending horizontally, and water-cooled pipes are used for the skid posts 11 and skid beam 12 in order to maintain the strength required to support a heavy load. Heat insulating material or heat insulating blocks are installed around the skid pipe 1 to reduce heat loss from the heating furnace to the cooling water flowing inside the skid pipe 1. The heat insulating blocks may be stacked adjacently above, below, left and right around the skid post 11 on the skid pipe 1. Specifically, Patent Document 1 discloses a structure in which adjacent heat insulating blocks on the top, bottom, left and right sides fit together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Microfilm of Utility Model Application No. 59-49547 (Utility Model Application No. 60-161788) Summary of the Invention [Problem to be solved by the invention]

[0004] Simply fitting adjacent insulation blocks together can cause the blocks to rotate relative to one another. Because the insulation blocks are made of porous materials to ensure insulation, they can easily be worn away by friction during rotation.

[0005] Therefore, the problem to be solved by the present invention is to provide an insulating block structure for a skid post that can suppress rotation of the installed insulating block, and a method for installing the same. [Means for solving the problem]

[0006] The gist of the present invention is as follows. 1. An insulation block structure for a skid post, which is formed by combining three types of insulation blocks, namely, a bottom insulation block placed in the bottom tier, a middle insulation block stacked at least one tier above the bottom insulation block, and a top insulation block placed on the top middle insulation block, and stacking these blocks around a skid post, The bottom insulation block has a recess in the center of its top surface and protrusions on both ends. The middle insulation block has a recess in the center of the upper and lower surfaces and a protrusion at each end. The uppermost insulating block has a recess in the center of the lower surface and protrusions on both ends. The convex parts of the two adjacent lowest insulation blocks fit into the concave parts on the underside of the middle insulation block of the lowest level, The convex parts on the top surfaces of the two adjacent middle insulation blocks fit into the concave parts of the top insulation block. death, A gap is provided between each of the insulating blocks and the skid post, and a layer of insulating castable material is provided in the gap. , Insulated block structure for skid posts. 2. 2. The insulation block structure for a skid post according to claim 1, wherein the convex portion and the concave portion of each insulation block are continuous with each other through an inclined surface. 3. A method for constructing an insulation block structure for a skid post, in which three types of insulation blocks are combined and stacked around a skid post: a bottom insulation block placed at the bottom, a middle insulation block placed above the bottom insulation block, and a top insulation block placed above the middle insulation block, The bottom insulation block has a recess in the center of its top surface and protrusions on both ends. The middle insulation block has a recess in the center of the upper and lower surfaces and a protrusion at each end. The uppermost insulating block has a recess in the center of the lower surface and protrusions on both ends. a first step of placing a first lowest insulation block and a second lowest insulation block around a skid post such that their respective protrusions are adjacent to each other; a second step of placing the middle insulation block so that the recessed portion on the lower surface of the middle insulation block fits into the adjacent protruding portion; and a third step of placing the first and second uppermost insulation blocks so that the convex portions of the first and second uppermost insulation blocks are adjacent to each other and the adjacent convex portions fit into the concave portions on the top surface of the middle insulation block. fruit, and further comprising the step of pouring insulating castable material between the skid post and each of the insulating blocks. ,Construction method of thermal insulation block structure for skid post. 4. The second step includes a step of stacking the middle insulation blocks by fitting a recess on the bottom surface of another middle insulation block into a protrusion on the top surface of an adjacent middle insulation block. 3 A method for constructing the insulating block structure for skid posts described in claim 1. [Effects of the Invention]

[0007] According to the present invention, it is possible to suppress rotation of the installed insulation block. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of an insulating block structure for a skid post according to one embodiment of the present invention; [Figure 2A] FIG. [Figure 2B] FIG. [Figure 2C] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is an enlarged cross-sectional view of part A in FIG. 1. [Figure 5] 10A and 10B are perspective views showing examples of other shapes of the retainer. [Figure 6A] A diagram showing the construction procedure for insulating blocks. [Figure 6B] Same as above. [Figure 6C] Same as above. [Figure 6D] Same as above. [Figure 6E] Same as above. [Figure 6F] Same as above. [Figure 7] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Fig. 1 shows a perspective view of an insulating block structure for a skid post, which is one embodiment of the present invention. The insulating block structure for a skid post (hereinafter simply referred to as the "insulating block structure") 2 shown in the figure is made up of a combination of three types of insulating blocks: a bottom insulating block 3, a middle insulating block 4, and a top insulating block 5, stacked around a skid post 11 of a skid pipe 1 shown in Fig. 7. Note that in Fig. 1, one of the two top insulating blocks 5 is omitted and a portion of the remaining one is shown in cross section, and the internal structure of one of the two bottom insulating blocks 3 is shown by dashed lines.

[0010] Figures 2A, 2B, and 2C show perspective views of the bottom insulation block 3, middle insulation block 4, and top insulation block 5, respectively. The bottom insulation block 3, middle insulation block 4, and top insulation block 5 are all precast blocks molded in advance and have a semi-cylindrical shape formed by dividing a cylinder into two parts circumferentially. The insulation block bodies 31, 41, and 51 of the bottom insulation block 3, middle insulation block 4, and top insulation block 5 are made of a material containing a porous insulating aggregate with a mineral composition of CaO·6Al2O3 (hereinafter referred to as "CA6 material"). The material of the insulation block bodies 31, 41, and 51 is not limited to CA6 material; other materials may be used as long as they provide sufficient insulation. However, from the standpoint of block strength and insulation, the material of the insulation block bodies 31, 41, and 51 is preferably CaO-Al2O3 material, with CA6 material being particularly preferred.

[0011] 2A, the lowest insulating block 3 has a recess 32 in the center of its top surface and protrusions 33 on both ends, with the recess 32 and protrusion 33 continuing via an inclined surface 34. The inclined surface 34 and the recess 32, and the inclined surface 34 and the protrusion 33, are each continuous with a curved surface. 2B, the middle insulation block 4 has recesses 42 in the center of the upper and lower surfaces and protrusions 43 on both ends, and the recesses 42 and protrusions 43 are connected by inclined surfaces 44. The inclined surfaces 44 and the recesses 42, and the inclined surfaces 44 and the protrusions 43 are each connected by curved surfaces. 2C, the bottom insulation block 5 has a recess 52 in the center of its underside and protrusions 53 on both ends, with the recess 52 and protrusion 33 continuing via an inclined surface 54. The inclined surface 54 and the recess 52, and the inclined surface 54 and the protrusion 53, are each continuous by a curved surface. In this embodiment, the top insulation block 5 has a shape obtained by turning the bottom insulation block 3 upside down.

[0012] The bottom insulation block 3, middle insulation block 4, and top insulation block 5 have through holes 35, 45, 55 that penetrate the insulation block body 31, 41, 51 in the radial direction from the outer peripheral surface to the inner peripheral surface, i.e., horizontally toward the outer peripheral surface of the skid post 11. The through holes 35, 45, 55 are provided at two locations circumferentially spaced apart from each other on the insulation block body 31, 41, 51. Specifically, the through holes 35, 45, 55 are provided at two locations, each at a central angle of 45° with respect to a radius that divides the insulation block body 31, 41, 51 evenly in half in the circumferential direction. In other words, the through holes 35, 45, 55 are provided along two radii that divide the semi-cylindrical insulation block body 31, 41, 51 evenly into four in the circumferential direction. The heat insulating block bodies 31, 41, 51 as a whole, including the positions and shapes of the through holes 35, 45, 55, have a shape that is plane symmetrical with respect to a vertical plane passing through a radius that divides the heat insulating block bodies 31, 41, 51 into equal halves in the circumferential direction.

[0013] Retainers 6 are attached to the through holes 35, 45, and 55. Fig. 3 shows a perspective view of the retainer 6. The retainers 6 attached to the through holes 35, 45, and 55 are the same, and the manner of attachment to the through holes 35, 45, and 55 is also the same. Therefore, the configuration of the retainer 6 and the manner of attachment to the through holes 55 will be described below with reference to Fig. 4, which is an enlarged cross-sectional view of part A in Fig. 1, together with Fig. 3.

[0014] In this embodiment, the retainer 6 is embedded in the inner wall surface of the through-hole 55 of the insulation block main body 51. In this embodiment, the retainer 6 is attached to the through-hole 55 so as to be embedded in the distal end of the through-hole 55, i.e., the inner peripheral surface of the insulation block main body 51. That is, the retainer 6 shown in FIG. 4 is embedded in the distal end of the through-hole 55 by placing the retainer 6 in the mold when the top insulation block 5, which is a precast block, is manufactured using a mold. Note that a space 55a is formed in the through-hole 55 on the proximal side of the retainer 6 (toward the outer peripheral surface of the insulation block main body 51), as shown in FIG. 2C . This space 55a can be formed by placing a core of a corresponding shape in the mold. Furthermore, this space 55a may be filled with a sealing material 102 made of alumina or CA6 material after welding the stud 7 to the skid post 11, as shown in FIG. 4 . As shown in FIGS. 2A and 2B, the through holes 35 and 45 of the lowermost insulating block 3 and the middle insulating block 4 are also provided with spaces 35a and 44a.

[0015] The reason for providing spaces 35a, 45a, and 55a in the through-holes 35, 45, and 55 proximal to the retainer 6 (closer to the outer periphery of the insulation block body 51) is to allow the welding gun to be inserted into the space and positioned when welding the stud 7 to the skid post 11, as described below. Also, by making the stud 7 longer than the overall length of the retainer 6, it is possible to create a portion for the welding gun to hold. Furthermore, if welding is performed without inserting the welding gun into the space of the through-hole, the stud position may not be centered, which could cause problems such as interference between the stud and the retainer when inserting the stud or scraping the through-hole with the stud. Additionally, the stud is positioned within the space to keep it as far away from the outer periphery of the insulation block body as possible. This prevents heat from escaping through the stud.

[0016] The retainer 6 is made of a ceramic material such as alumina and has a generally rectangular prism shape. The central portion of the retainer 6 has an insertion hole 61 for inserting the stud 7, and the insertion hole 61 is continuous with the through hole 55. The retainer 6 also has a rectangular flange portion 62 on the outer peripheral surface of the insulation block main body 51. Meanwhile, the inner peripheral surface of the insulation block main body 51 has an engagement portion 56 on the inner surface of the through hole 55. The flange portion 62 of the retainer 6 engages with the engagement portion 56 from the outer peripheral surface of the insulation block main body 51. That is, the flange portion 62 of the retainer 6 functions as an engagement portion that engages with the engagement portion 56 from the outer peripheral surface of the insulation block main body 51. Since the flange portion 62 of the retainer 6 engages with the engagement portion 56 from the outer peripheral surface of the insulation block main body 51, the retainer 6 is less likely to come off the through hole 55 toward the inner peripheral surface of the insulation block main body 51.

[0017] In addition, the outer peripheral surface of the insulation block main body 51 has an engagement portion 57 on the inner surface of the through hole 55. The flange portion 62 of the retainer 6 engages with this engagement portion 57 from the inner peripheral surface of the insulation block main body 51. This makes it difficult for the retainer 6 to come off from the through hole 55 toward the outer peripheral surface of the insulation block main body 51. Furthermore, the through hole 55 becomes gradually smaller from the flange portion 62 of the retainer 6 toward the outer peripheral surface of the insulation block main body 51. This also makes it difficult for the retainer 6 to come off from the through hole 55 toward the outer peripheral surface of the insulation block main body 51.

[0018] The retainer 6 has a protrusion 63 that protrudes from the inner peripheral surface of the insulation block body 51. Providing this protrusion 63 makes it easier to ensure a gap between the outer peripheral surface of the skid post 11 and the inner peripheral surface of the insulation block body 51. Providing the protrusion 63 also has the effect of making the retainer 6 longer and ensuring the supporting force by keeping the stud 7 in contact with the retainer 6 for a certain length or more.

[0019] The shape of the retainer 6 is not limited to the shape shown in FIG. 3 . For example, as shown in FIG. 5 , the retainer 6 may be substantially cylindrical with a disk-shaped flange 62. Alternatively, the retainer 6 may be a simple rectangular or cylindrical shape without a flange. In either case, the retainer 6 only needs to have an insertion hole 61 for inserting a stud. The shape of the insertion hole 61 is also not limited. It may be circular as shown in FIG. 3 or rectangular as shown in FIG. 5 . The retainer 6 may be attached to the through hole 55 of the insulation block main body 51 in a manner other than being embedded or fixed at the tip end of the through hole 55. For example, the retainer 6 may be attached to the through hole 55 so that it is movable within the through hole 55. By allowing the retainer 6 to move radially of the insulation block main body 51, the gap between the inner circumferential surface of the insulation block main body 51 and the outer circumferential surface of the skid post 11 can be adjusted.

[0020] Next, we will explain the construction method for installing three types of insulation blocks, the bottom insulation block 3, the middle insulation block 4, and the top insulation block 5, around the skid post 11. As mentioned above, the top insulation block 5 is the bottom insulation block 3 turned upside down, but since the construction direction is different, they are distinguished as types of insulation block. First, as shown in Fig. 6A, the first lowest insulation block 3A is placed around the skid post 11. At this time, a gap of a predetermined width is secured between the outer peripheral surface of the skid post 11 and the inner peripheral surface of the first lowest insulation block 3A as a space for pouring insulating castable material in a subsequent process, and as shown in Fig. 4, the retainer 6 has a protruding portion 63 that protrudes from the inner peripheral surface of the insulation block body, making it easy to secure the gap of the predetermined width. After placing the first lowest insulation block 3A around the skid post 11, a stud 7 set in a welding gun 8 is passed through the space 35a of the through-hole 35 of the first lowest insulation block 3A and the insertion hole 61 of the retainer 6 attached to the through-hole 35, and the tip of the stud 7 is welded to the outer circumferential surface of the skid post 11 using the welding gun 8. Because the first lowest insulation block 3A has two through-holes 35, the tip of the stud 7 is welded to the outer circumferential surface of the skid post 11 at both locations. This welding process may be performed after placing the second lowest insulation block 3B, which will be described later. In FIG. 6A , a ceramic fiber sheet 9 is placed under the first lowest insulation block 3A to absorb thermal expansion.

[0021] Next, as shown in Figure 6B, the second lowest insulation block 3B is placed adjacent to the first lowest insulation block 3A. Specifically, the first and second lowest insulation blocks 3A and 3B are placed so that their respective protrusions 33, 33 are adjacent to each other. Then, the tips of the studs 7 are welded to the outer periphery of the skid post 11 using a welding gun 8 through two through-holes 35 in the second lowest insulation block 3B. A ceramic fiber sheet 9 is placed in the vertical joint between the first and second lowest insulation blocks 3A and 3B.

[0022] Next, as shown in FIG. 6C , two middle insulation blocks 4A and 4B are placed adjacent to each other on top of the adjacent first and second lowest insulation blocks 3A and 3B. Specifically, the middle insulation blocks 4A and 4B are placed adjacent to each other so that the recesses 42 on the undersides of the middle insulation blocks 4A and 4B fit into the protrusions 33 on the adjacent first and second lowest insulation blocks 3A and 3B. Accordingly, the protrusions 43 on the adjacent middle insulation blocks 4A and 4B fit into the recesses 32 on the upper surfaces of the first and second lowest insulation blocks 3A and 3B. After placing the middle insulation blocks 4A and 4B, the tips of the studs 7 are welded to the outer periphery of the skid post 11 through the through holes 45, as with the bottom insulation blocks 3A and 3B. Ceramic fiber sheets 9 are arranged at the horizontal joints between the lowest insulation blocks 3A, 3B and the middle insulation blocks 4A, 4B, and at the vertical joints between the two middle insulation blocks 4A, 4B.

[0023] Next, as shown in Fig. 6D, insulating castable material is poured into the gap between the inner peripheral surface of each of the insulating blocks 3A, 3B, 4A, and 4B and the outer peripheral surface of the skid post 11 to form an insulating castable material layer 101. Note that this insulating castable material layer 101 can also be formed in a later process.

[0024] Next, as shown in Figure 6E, two middle insulation blocks 4C and 4D are placed adjacent to each other as the top middle insulation blocks on top of the adjacent bottom middle insulation blocks 4A and 4B. Specifically, the middle insulation blocks 4C and 4D are placed adjacent to each other so that the convex portions 43 on the top surfaces of the adjacent bottom middle insulation blocks 4A and 4B fit into the concave portions 42 on the bottom surfaces of the top middle insulation blocks 4C and 4D. Accordingly, the convex portions 43 on the bottom surfaces of the adjacent top middle insulation blocks 4C and 4D fit into the concave portions 42 on the top surfaces of the bottom middle insulation blocks 4A and 4B. Next, the first and second top insulation blocks 5A and 5B are placed adjacent to each other on top of the adjacent uppermost middle insulation blocks 4C and 4D. Specifically, the convex portion 53 of the first and second top insulation blocks 5A and 5B are placed adjacent to each other so that the adjacent convex portions 53 fit into the concave portions 42 on the top surfaces of the uppermost middle insulation blocks 4C and 4D. Accordingly, the convex portions 43 on the top surfaces of the adjacent uppermost middle insulation blocks 4C and 4D fit into the concave portions 52 of the uppermost insulation blocks 5A and 5B.

[0025] Next, as shown in FIG. 6F , insulating castable material is poured into the gaps between the inner circumferential surfaces of the insulation blocks 4C, 4D, 5A, and 5B and the outer circumferential surface of the skid post 11 to form an insulating castable material layer 101. Furthermore, the spaces of the through holes 35, 45, and 55 of the insulation blocks 3A, 3B, 4A, 4B, 4C, 4D, 5A, and 5B are filled with a sealant 102, for example, by troweling. The step of filling the spaces of the through holes 35, 45, and 55 with the sealant 102 can also be performed before the step of pouring the insulating castable material into the gaps between the inner circumferential surfaces of the insulation blocks and the outer circumferential surface of the skid post 11.

[0026] The above steps result in the insulating block structure 2 shown in FIG. 1. In this insulating block structure 2, as described with reference to FIGS. 6A-6F, the convex portions 33, 33 of the two adjacent lowest insulating blocks 3A, 3B fit into the concave portions 42, 42 on the undersides of the lowest middle insulating blocks 4A, 4B, and the convex portions 43, 43 on the top surfaces of the two adjacent uppermost middle insulating blocks 4A, 4B fit into the concave portions 52, 52 on the topmost insulating blocks 5A, 5B. In this way, in the insulating block structure 2, the insulating blocks installed above and below fit together in a composite manner, preventing rotation of the installed insulating blocks. Furthermore, in this embodiment, the convex portions and concave portions of each insulating block are connected by inclined surfaces, allowing the insulating blocks installed above and below to fit together smoothly. Furthermore, in this embodiment, as clearly shown in Figure 4, a gap is provided between each insulating block and the skid post 11, and an insulating castable material layer 101 is provided in this gap, thereby improving the insulating properties of the skid post 11.

[0027] The insulation block used in this embodiment has a retainer 6 attached to a through-hole that penetrates from the outer circumferential surface to the inner circumferential surface of the insulation block body. The retainer 6 has an insertion hole 61 through which a stud 7 is inserted, and the insertion hole 61 is continuous with the through-hole. With this configuration, as shown in FIG. 4, for example, the stud 7 can be welded to the skid post 11 through the through-hole 55 and the insertion hole 61. That is, according to this embodiment, the stud 7 can be welded to the skid post 11 after installation, rather than being pre-welded to the skid post 11 as in the prior art. This simplifies the installation of the insulation block around the skid post 11. Furthermore, because the stud 7 is inserted through the insertion hole 61 of the retainer 6 attached to the through-hole 55, as shown in FIG. 4, for example, the stud 7 is less likely to interfere with the insulation block body, such as the inner surface of the through-hole 55. This reduces the risk of damage to the insulation block when it is installed around the skid post.

[0028] In the above embodiment, each heat insulating block has a semi-cylindrical shape, which is obtained by dividing a cylinder into two parts in the circumferential direction, but the number of divisions is not limited to two and can be three or four or more parts. However, if the number of divisions is large, the installation work around the skid post becomes complicated, so in reality, dividing into two parts is appropriate.

[0029] The insulating block structure 2 of this embodiment has two levels of middle insulating blocks: the lowest middle insulating blocks 4A and 4B and the highest middle insulating blocks 4C and 4D. However, one or more levels of middle insulating blocks can also be provided between the lowest middle insulating blocks 4A and 4B and the highest middle insulating blocks 4C and 4D. Also, there can be only one level of middle insulating blocks. In this case, the lowest middle insulating block and the highest middle insulating block are the same middle insulating block. In other words, when there is only one level of middle insulating block, that middle insulating block serves as both the lowest middle insulating block and the highest middle insulating block. In the insulating block structure 2 of this embodiment, a through hole 45 is also provided in the middle insulating block 4, and a retainer 6 is attached to the through hole 45. However, in the insulating block structure 2, the middle insulating block 4 does not necessarily have to have a through hole 45 or a retainer 6. This is because a certain level of strength can be ensured if studs are inserted through the bottom insulation block 3 and the top insulation block 5. Of course, from the perspective of increasing the strength of the insulation block structure 2, it is preferable to also insert studs through the middle insulation block 4, as in this embodiment.

[0030] In this embodiment, the bottom insulation block 3, middle insulation block 4, and top insulation block 5 have a semi-cylindrical shape formed by dividing a cylinder in half circumferentially, but they can take various shapes depending on the shape of the skid post. For example, if the skid post is a square pillar, the insulation block may be roughly U-shaped formed by dividing a square cylinder in half. In this case, the through holes provided in the insulation blocks are spaced apart in the longitudinal direction of the insulation block. [Explanation of symbols]

[0031] 1 Skid pipe 11 Skid Post 12 Skid beam 2. Insulated block structure 3, 3A, 3B Bottom insulation block 31 Insulation block body 32 recess 33 Convex part 34 Slope 35 through holes 35a space 4, 4A, 4B, 4C, 4D Middle insulation block 41 Insulation block body 42 recess 43 Convex part 44 Slope 45 through holes 45a Space 5, 5A, 5B Top insulation block 51 Insulation block body 52 recess 53 Convex part 54 Slope 55 Through hole 55a Space 56, 57 Engagement part 6 Retainer 61 Insertion hole 62 Flange portion (locking portion) 63 Protrusion 7 studs 8 welding gun 9. Ceramic fiber sheet 101 Heat insulating castable material 102 Sealing material

Claims

1. An insulation block structure for a skid post, which is formed by combining three types of insulation blocks, namely, a bottom insulation block placed in the bottom tier, a middle insulation block stacked at least one tier above the bottom insulation block, and a top insulation block placed on the top middle insulation block, and stacking these blocks around a skid post, The bottom insulation block has a recess in the center of its top surface and protrusions on both ends. The middle insulation block has a recess in the center of the upper and lower surfaces and a protrusion at each end. The uppermost insulating block has a recess in the center of the lower surface and protrusions on both ends. The convex portions of the two adjacent lowest insulation blocks fit into the concave portions on the underside of the middle insulation block of the lowest level, The convex portions on the top surfaces of the two adjacent middle insulation blocks of the top tier fit into the concave portions of the top insulation block, A gap is provided between each of the insulation blocks and the skid post, and a layer of insulating castable material is provided in the gap.

2. 2. The insulation block structure for a skid post according to claim 1, wherein the convex portion and the concave portion of each insulation block are continuous with each other by an inclined surface.

3. A method for constructing an insulation block structure for a skid post, in which three types of insulation blocks, namely a bottom insulation block placed at the bottom, a middle insulation block placed above the bottom insulation block, and a top insulation block placed above the middle insulation block, are combined and stacked around a skid post, The bottom insulation block has a recess in the center of its top surface and protrusions on both ends. The middle insulation block has a recess in the center of the upper and lower surfaces and a protrusion at each end. The uppermost insulating block has a recess in the center of the lower surface and protrusions on both ends. a first step of placing a first lowest insulation block and a second lowest insulation block around a periphery of a skid post such that their respective convex portions are adjacent to each other; a second step of placing the middle insulation block so that the recessed portion on the lower surface of the middle insulation block fits into the adjacent protruding portion; a third step of placing the first and second uppermost insulation blocks so that the convex portions of the first and second uppermost insulation blocks are adjacent to each other and the adjacent convex portions fit into the concave portions on the top surface of the middle insulation block; The method for constructing an insulating block structure for a skid post further includes a step of pouring insulating castable material between the skid post and each of the insulating blocks.

4. The insulation block structure for skid posts is constructed as described in claim 3, wherein the second step includes stacking the middle insulation blocks by fitting the convex portion on the upper surface of one middle insulation block into the concave portion on the lower surface of another middle insulation block that is adjacent to the middle insulation block.

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