Sleeve and through-hole structure

Abstract

To provide a sleeve capable of easily coping with the size of a through-hole, a through-hole structure, and an installation method of the sleeve.SOLUTION: A sleeve 20 has a peripheral wall 21 formed in a square frame shape by combining four bent members 30. Each of the four bent members 30 has a square forming part 33, a first plate part 31, and a second plate part 32. The four bent members 30 form the peripheral wall 21 by setting a tip of the first plate part 31 of one bent member 30 out of two adjacent bent members 30 to be adjacent to the tip of the second plate part 32 of the other bent member 30, and enlarge / reduce an inner space K of the peripheral wall 21 by changing a lap length of the tips of the adjacent first plate part 31 and the second plate part 32.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a sleeve, a through-hole structure, and a method for installing the sleeve. [Background technology]

[0002] In order to allow a penetrating member to pass through a through hole that penetrates a partition wall of a building in the wall thickness direction, a sleeve is disposed in the through hole of the partition wall (see, for example, Patent Document 1). As shown in Figure 21, a large opening 111a is formed in one wall panel 111 of a hollow wall 110 serving as a partition wall, and a small opening 112a is formed in the other wall panel 112. A through hole 114 formed in the hollow wall 110 is formed by the large opening 111a and the small opening 112a communicating with each other via an internal space 113 between the two wall panels 111, 112. The small opening 112a is of a size necessary to insert a cable, which is an example of a penetration member. The large opening 111a and the small opening 112a are each rectangular holes and similar in shape to each other.

[0003] The frame 115, which serves as a sleeve disposed in the through-hole 114, has a rectangular cylindrical tubular portion 116, a rectangular frame-shaped large flange portion 117, and a rectangular frame-shaped small flange portion 118. The tubular portion 116 is sized to be inserted into the large-size opening 111a. The tubular portion 116 is slightly larger than the small-size opening 112a.

[0004] The large flange portion 117 is connected to one axial end edge of the cylindrical portion 116. The outer peripheral edge of the large flange portion 117 is slightly larger than the large-size opening 111a. The outer peripheral edge of the small flange portion 118 is connected to the other axial end edge of the cylindrical portion 116. The inner peripheral edge of the small flange portion 118 is the same as or slightly larger than the small-size opening 112a.

[0005] The frame 115 is inserted through the large opening 111a in the through hole 114. The large flange portion 117 is in close contact with the outer surface of one wall panel 111. The small flange portion 118 is in close contact with the inner surface of the other wall panel 112. The use of the frame 115 prevents small animals and flames from entering the internal space 113 through the large opening 111a and the small opening 112a. Wiring and piping materials are inserted into the frame 115. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-104738 Summary of the Invention [Problem to be solved by the invention]

[0007] However, through holes 114 of various sizes are formed in the hollow wall 110. In order to match the size of the frame body 115 to the size of the through holes 114 that are formed, it is necessary to prepare a plurality of types of frame bodies 115 of different sizes. Alternatively, when a frame body 115 of one size is used, it is necessary to form the through holes 114 according to the size of the frame body 115. [Means for solving the problem]

[0008] The sleeve for solving the above-mentioned problems is a sleeve that penetrates a partition wall in the wall thickness direction, and surrounds a penetrating member that is disposed within a through hole that is rectangular as viewed in the wall thickness direction, and includes a peripheral wall that is formed into a rectangular frame shape by combining a plurality of peripheral wall constituents made of metal plates, and the peripheral wall constituents have four bending members and two or four straight portion forming members, and when the direction in which an internal space surrounded by the peripheral wall opens is defined as the penetrating direction of the peripheral wall, each of the four bending members is L-shaped as viewed along the penetrating direction and is made of metal plate having a constant width in the penetrating direction, and The peripheral wall has four side walls, and at least two of the four side walls are composed of a tip end of the plate portion of one of two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends, and the internal space can be expanded or contracted by changing the overlap length in the protruding direction.

[0009] Regarding the sleeve, the peripheral wall has a square frame-shaped flange that protrudes outward from one end edge in the penetration direction of the peripheral wall, and all of the plurality of peripheral wall constituent bodies have plate-shaped flange forming portions that form the flanges at one end edge in the penetration direction, and two of the flange forming portions that are adjacent in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions, the peripheral wall has two sets of two of the side walls that face each other in the four side walls, and each of the two side walls of one of the sets is constituted by two of the bending members and one of the straight portion forming bodies, and each of the side walls of the other set is constituted by two of the bending members of one of the sets that face each other across the internal space, and the two bending members that are positioned apart in the circumferential direction in one of the two side walls of one of the sets are The outer polymer is polymerized on the outside of the rectangular frame shape with respect to the first straight portion forming body connecting two bending members, and the flange forming portion is polymerized on the other end edge side in the penetration direction than the flange forming portion of the first straight portion forming body, and in the other side wall of the two side walls of one of the sets, the two bending members positioned apart in the circumferential direction are inner polymers polymerized on the inside of the rectangular frame shape with respect to the second straight portion forming body connecting the two bending members, and the flange forming portion is polymerized on the one end edge side in the penetration direction than the flange forming portion of the second straight portion forming body, and in each of the two side walls of the other set, the tip portion of the plate portion of the outer polymer is polymerized so as to be outside the tip portion of the plate portion of the inner polymer.

[0010] Regarding the sleeve, the peripheral wall has the flange at the other end edge in the penetration direction, and all of the four bending members have the flange forming portion at the other end edge in the penetration direction, and when the peripheral wall is constructed only by the four bending members, and each of the two side walls in one set and each of the two side walls in the other set are constructed by two bending members, it is preferable that in one set, the outer polymer and the inner polymer face each other via the internal space, and in the other set, the outer polymer and the inner polymer face each other via the internal space.

[0011] The sleeve for solving the above-mentioned problems is a sleeve that penetrates a partition wall in a wall thickness direction, and surrounds a penetrating member that is disposed within a through hole that is square when viewed in the wall thickness direction, and includes a square-frame-shaped peripheral wall formed by combining a plurality of peripheral wall constituents, and the penetrating direction is the direction in which an internal space surrounded by the peripheral wall opens, and each of the peripheral wall constituents is made of a metal plate having a plate portion with a constant width in the penetrating direction, and the peripheral wall has a square-frame-shaped flange that protrudes outward from one end edge in the penetrating direction, and all of the plurality of peripheral wall constituents have a plate-shaped flange forming portion that forms the flange at one end edge in the penetrating direction, and adjacent peripheral wall constituents in the circumferential direction The flange forming portions of the two mating peripheral wall constituents are overlapped in the plate thickness direction of the flange forming portions, one of the overlapped flange forming portions is formed in a stepped shape in the plate thickness direction, and the other of the overlapped flange forming portions overlaps with the step of one of the flange forming portions so that the overlapped flange forming portions are flush with each other, the peripheral wall has four side walls, and each side wall is formed by overlapping, in the plate thickness direction, a tip end portion of one of the peripheral wall constituents that are adjacent to each other in the circumferential direction of the peripheral wall, and the internal space can be expanded or contracted by changing the overlap length of the peripheral walls in the circumferential direction.

[0012] In the sleeve, the flange forming portions adjacent to each other in the circumferential direction may be arranged in a stacking order in the plate thickness direction that is alternated in the circumferential direction. With regard to the sleeve, it is preferable that the length from the base end to the tip end of one of the two plate portions of the peripheral wall constituent body is different from the length from the base end to the tip end of the other plate portion.

[0013] The sleeve may preferably include an outer blocking member that has a thickness greater than the dimension in the thickness direction of the peripheral wall constituent and is compressible and deformable in the thickness direction by an amount equal to or greater than the thickness of the peripheral wall constituent.

[0014] A through hole structure for solving the above problems is summarized as follows: a penetrating member is disposed in a through hole that penetrates a partition wall in a wall thickness direction and is square when viewed in the wall thickness direction; the penetrating member is surrounded by a sleeve according to any one of claims 1 to 7 that is disposed in the through hole; the sleeve has a square frame shape formed by combining a plurality of peripheral wall constituents, each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction; two peripheral wall constituents that are adjacent in the circumferential direction of the peripheral wall have their tip ends overlapped in the plate thickness direction of the peripheral wall constituents; and an outer blocking member that is compressively deformed in the plate thickness direction of the peripheral wall constituents is disposed between the overlapped peripheral wall constituents and the inner surface of the through hole.

[0015] A through-hole structure for solving the above problems is characterized in that a through-hole penetrates a hollow wall formed by a pair of partition walls that form a cavity therebetween in a wall thickness direction as a partition wall, and a through-hole that is square when viewed in the wall thickness direction has a through-hole member disposed in it, and the through-hole member is surrounded by a sleeve according to any one of claims 1 to 7 that is disposed in the through-hole, and each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction that is greater than the wall thickness of the hollow wall, and two peripheral wall constituents that are adjacent in the circumferential direction of the peripheral wall are positioned in the hollow wall with their tip ends overlapping in the plate thickness direction of the peripheral wall constituents.

[0016] Regarding the through-hole structure, one end of the sleeve in the penetration direction protrudes from the surface of the partition wall, and the sleeve is positioned on the partition wall by positioning tape attached across the outer surface of the sleeve protruding from the partition wall and the surface of the partition wall.

[0017] A sleeve installation method for solving the above problems is a sleeve installation method that penetrates a partition wall in the wall thickness direction and surrounds a penetrating member that is placed inside a through hole that is square when viewed in the wall thickness direction, the sleeve having a peripheral wall formed by combining four peripheral wall constituents into a rectangular frame shape, the sleeve having an L-shape when viewed along the penetration direction and made of a metal plate that has a constant width in the penetration direction, where the direction in which an internal space surrounded by the peripheral wall opens is the penetration direction and the direction in which the internal space is surrounded is the circumferential direction, the four peripheral wall constituents having an angular forming portion and two plate portions that protrude perpendicularly from the angular forming portion and have a constant width in the protruding direction are arranged inside the through hole, the multiple peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction, and of the two adjacent peripheral wall constituents, a tip end of the plate portion of one of the peripheral wall constituents and a tip end of the plate portion of the other peripheral wall constituent are overlapped in the plate thickness direction of both tip ends to form the sleeve that is equipped with the peripheral wall.

[0018] A sleeve installation method for solving the above problems is a sleeve installation method that penetrates a partition wall in a wall thickness direction, and surrounds a penetrating member that is placed inside a through hole that is rectangular when viewed in the wall thickness direction, the sleeve having a peripheral wall formed by combining four peripheral wall constituents into a rectangular frame shape, and an outer blocking member that has a thickness greater than the dimension in the plate thickness direction of the peripheral wall constituent and is compressible and deformable in the thickness direction by an amount of compression equal to or greater than the plate thickness of the peripheral wall constituent is placed along the inner surface of the through hole that penetrates the partition wall, and when the direction in which an internal space surrounded by the peripheral wall opens is defined as a penetration direction and the direction in which the internal space is surrounded is defined as a circumferential direction, the peripheral wall constituent is L-shaped when viewed from the outside and made of a metal plate having a constant width in the through-hole direction, the peripheral wall constituent having an angular portion and two plate portions protruding perpendicularly from the angular portion and having a constant width in the protruding direction, is disposed in the through-hole, a plurality of the peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction, a tip end of the plate portion of one of the two adjacent peripheral wall constituents is overlapped with a tip end of the plate portion of the other of the two adjacent peripheral wall constituents in the plate thickness direction of both tip ends, and the overlap amount of both tip ends is changed while compressing the outer blocking member, and the both tip ends are joined to form the sleeve provided with the peripheral wall. [Effects of the Invention]

[0019] According to the present invention, the size of the through-hole can be flexibly accommodated. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view showing the sleeve in a contracted state. [Figure 6] FIG. 10 is a perspective view showing the state in which the outer blocking member is placed along the inner surface of the through hole. [Figure 7] FIG. 10 is a front view of the state in which the outer blocking member is placed along the inner surface of the through hole. [Figure 8] FIG. 10 is a perspective view showing a state in which a first bending member is disposed in a through hole. [Figure 9] FIG. 10 is a front view showing a state in which a second bending member is disposed in a through hole. [Figure 10] FIG. 10 is a front view showing the state in which the third bending member is placed in the through-hole. [Figure 11] FIG. 10 is a front view showing the state in which the sleeve is placed in the through hole. [Figure 12] FIG. [Figure 13] FIG. 10 is a front view showing a sleeve according to a second embodiment. [Figure 14] FIG. [Figure 15] 10(a) is a perspective view showing a sleeve of a third embodiment, and FIG. 10(b) is an enlarged view showing an overlapping portion of a flange forming portion. [Figure 16] FIG. 10 is a perspective view showing components of a sleeve of a third embodiment. [Figure 17] FIG. 10 is a plan view showing a sleeve according to a third embodiment. [Figure 18] FIG. 10 is a plan view showing a sleeve of another example. [Figure 19] FIG. 2 is a perspective view showing a first assembly and a second assembly. [Figure 20] FIG. 10 is a front view showing another example of the sleeve. [Figure 21] FIG. 1 illustrates the background art. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) A first embodiment embodying a sleeve, a through-hole structure, and a sleeve installation method will be described below with reference to FIGS.

[0022] As shown in Figure 1 or 2, the fireproof hollow wall W as a partition wall is constructed from a plurality of lightweight shaped steel members 10 and a first partition wall 11 and a second partition wall 12 erected on either side of the lightweight shaped steel members 10. The first partition wall 11 and the second partition wall 12 are made of, for example, gypsum board.

[0023] A cavity S is formed between a first partition wall 11 and a second partition wall 12 that face each other with a lightweight steel material 10 in between. A through hole 14 is formed in the fireproof hollow wall W to allow a fluid pipe 13, which is an example of a penetrating member, to pass through. The through hole 14 penetrates the fireproof hollow wall W in the wall thickness direction. The wall thickness direction of the fireproof hollow wall W is the direction in which the first partition wall 11 and the second partition wall 12 are arranged side by side. Examples of penetrating members include wiring (control cables, coaxial cables, optical cables, etc.) and piping materials (flexible synthetic resin electrical conduits, steel electrical conduits, fluid pipes, etc.) that are arranged within a building.

[0024] The fluid pipe 13 is covered with a cylindrical insulating material 17. A fire-resistant member 18 is wrapped around the insulating material 17. The fire-resistant member 18 is in the form of a rectangular sheet. The fire-resistant member 18 includes a heat-expandable fire-resistant material layer (not shown). The fire-resistant member 18 wrapped around the insulating material 17 is fastened in the circumferential direction of the fluid pipe 13 by wires 19, thereby being wrapped around the insulating material 17.

[0025] The through hole 14 is formed by communication between the first hole 11a in the first partition wall 11, the second hole 12a in the second partition wall 12, and the cavity S. The first hole 11a is rectangular in a front view of the first partition wall 11 from the front surface side, and the second hole 12a is rectangular in a front view of the second partition wall 12 from the front surface side. The center point P1 of the first hole 11a and the center point P2 of the second hole 12a coincide with the wall thickness direction of the fireproof hollow wall W. The through hole 14 penetrates the fireproof hollow wall W in the wall thickness direction and is rectangular when viewed in the wall thickness direction.

[0026] Next, a through-hole structure in which the fluid pipe 13 passes through the through-hole 14 will be described. Within the through hole 14, a rectangular frame-shaped sleeve 20 surrounds the fluid pipe 13 that is disposed through the through hole 14. The fluid pipe 13 is inserted into the sleeve 20, thereby penetrating the through hole 14 in the fireproof hollow wall W. A filler material 15 is filled between the inner surface of the sleeve 20 and the outer peripheral surface of the fluid pipe 13, with the insulating material 17 and the fire-resistant member 18 sandwiched between them. The filler material 15 seals the gap between the inner surface of the sleeve 20 and the outer peripheral surface of the fluid pipe 13, with the insulating material 17 and the fire-resistant member 18 sandwiched between them. The filler material 15 is made of a flame-retardant, thermally expandable, heat-resistant material, but may also be made of a non-flammable, thermally expandable material, or may not have thermal expandability.

[0027] Additionally, an outer blocking member 16 is disposed between the inner surface of the first hole 11a and the outer surface of the sleeve 20, and between the inner surface of the second hole 12a and the outer surface of the sleeve 20. The outer blocking member 16 is formed from non-breathable rock wool. However, the material of the outer blocking member 16 can be changed as appropriate as long as it is formed from a non-flammable material such as ceramic wool. The outer blocking member 16 is in the form of an elongated strip and a sheet. The outer blocking member 16 is formed by cutting a large sheet-shaped outer blocking member 16, but a pre-formed elongated sheet may also be used.

[0028] 6, the dimension of the outer blocking member 16 in the short side direction is equal to or greater than the wall thickness of the first partition wall 11 and the wall thickness of the second partition wall 12. However, if the dimension of the outer blocking member 16 in the short side direction is greater than the wall thickness of the first partition wall 11 and the wall thickness of the second partition wall 12, the outer blocking member 16 protrudes toward the cavity S and does not protrude toward the front side of the fire-resistant hollow wall W.

[0029] In the outer blocking member 16, the direction perpendicular to the short side direction and the long side direction is defined as the thickness direction, and the dimension of the outer blocking member 16 in the thickness direction is defined as the thickness. The outer blocking member 16 can be compressed and deformed in the thickness direction, and its thickness can be reduced as it is compressed.

[0030] As shown in FIG. 2 , an outer blocking member 16 is disposed along the inner surface of the first hole 11a in the first partition wall 11 and the inner surface of the second hole 12a in the second partition wall 12. The outer blocking member 16 disposed in the first hole 11a blocks the gap between the inner surface of the first hole 11a and the outer surface of the sleeve 20 facing the inner surface. The outer blocking member 16 disposed in the second hole 12a blocks the gap between the inner surface of the second hole 12a and the outer surface of the sleeve 20 facing the inner surface. The outer blocking member 16 is compressed in the thickness direction between the inner surfaces of the holes 11a and 12a and the outer surface of the sleeve 20. The compressed and deformed outer blocking member 16 returns to its original shape, deforming along and contacting the inner surfaces of the holes 11a and 12a and the outer surface of the sleeve 20. In other words, the outer blocking member 16 blocks the gap between the inner surfaces of the holes 11a and 12a and the outer surface of the sleeve 20 without leaving any gaps.

[0031] The through hole 14 in the fireproof hollow wall W is closed using the filler material 15, the outer blocking member 16, and the sleeve 20. In other words, the filler material 15, the outer blocking member 16, and the sleeve 20 form a through hole structure that closes the through hole 14.

[0032] Next, the sleeve 20 will be described. 3 and 5, the sleeve 20 includes a peripheral wall 21 formed into a rectangular frame shape by combining four bending members 30, which are an example of a peripheral wall constituent. The sleeve 20 in FIG. 5 is a reduced-size version of the sleeve 20 shown in FIG.

[0033] An internal space K is defined inside the peripheral wall 21. The direction in which a central axis L of the peripheral wall 21 extends is the direction in which the internal space K opens, and the direction in which the central axis L extends is defined as a penetration direction Z. The peripheral wall 21 has four side walls 22 and corners 23 formed at the intersections of adjacent side walls 22. Each of the four side walls 22 is in the shape of a rectangular plate. The direction in which the peripheral wall 21 surrounds the internal space K is defined as the circumferential direction.

[0034] Next, a description will be given of the bending members 30. Since the four bending members 30 have the same shape and size, one bending member 30 will be specifically described. As shown in FIG. 4 , the bending member 30 is formed by bending a metal plate having an elongated rectangular shape when viewed in the plate thickness direction into an L shape. The bending member 30 has a first plate portion 31 having a rectangular plate shape, a second plate portion 32 perpendicular to the first plate portion 31, and a corner portion 33 located at the intersection of the first plate portion 31 and the second plate portion 32. Therefore, the bending member 30 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The bending member 30 also has the corner portion 33 and two plate portions that protrude from the corner portion 33 perpendicularly to each other in the protruding direction and have a constant width in the protruding direction, one of which is the first plate portion 31 and the other is the second plate portion 32.

[0035] The first plate portion 31 has a rectangular first inner surface 31a on one surface in the thickness direction and a rectangular first outer surface 31b on the other surface in the thickness direction. The second plate portion 32 has a rectangular second inner surface 32a on one surface in the thickness direction and a rectangular second outer surface 32b on the other surface in the thickness direction.

[0036] The first inner surface 31a of the first plate portion 31 and the second inner surface 32a of the second plate portion 32 are perpendicular to each other. The first outer surface 31b of the first plate portion 31 and the second outer surface 32b of the second plate portion 32 are perpendicular to each other. When the first plate portion 31 is viewed in the plate thickness direction, the direction in which the long sides of the first inner surface 31a and the first outer surface 31b extend is defined as the first direction H1 of the first plate portion 31. The first direction H1 is the direction in which the two long edge portions of the first plate portion 31 extend. The first direction H1 is the protruding direction in which the first plate portion 31 protrudes from the second plate portion 32.

[0037] When the second plate portion 32 is viewed in the plate thickness direction, the direction in which the short sides of the second inner surface 32a and the second outer surface 32b extend is defined as the second direction H2 of the second plate portion 32. The second direction H2 is the direction in which the two short edges of the second plate portion 32 extend. The second direction H2 is the protruding direction in which the second plate portion 32 protrudes from the first plate portion 31.

[0038] The direction in which the short sides of the first inner surface 31a and the first outer surface 31b extend is the same as the direction in which the long sides of the second inner surface 32a and the second outer surface 32b extend, and these directions are referred to as the width direction H3. The dimension of the first plate portion 31 in the width direction H3 is constant in the first direction H1. Therefore, the first plate portion 31 has a constant width that does not change along the first direction H1, which is the direction in which the first plate portion 31 protrudes from the corner forming portion 33. The dimension of the second plate portion 32 in the width direction H3 is constant in the second direction H2. Therefore, the second plate portion 32 has a constant width that does not change along the second direction H2, which is the direction in which the second plate portion 32 protrudes from the corner forming portion 33. The dimension of the first plate portion 31 in the width direction H3 is equal to the dimension of the second plate portion 32 in the width direction H3. The dimension from the base end to the tip of the first plate portion 31 along the first direction H1 is longer than the dimension from the base end to the tip of the second plate portion 32 along the second direction H2. That is, the dimension of the first plate portion 31 along the first direction H1 is different from the dimension of the second plate portion 32 along the second direction H2.

[0039] The corner forming portion 33 is a location where the first plate portion 31 and the second plate portion 32 intersect. In the bending member 30, the base ends of the first plate portion 31 and the second plate portion 32 are located at the corner forming portion 33, and are located at the boundary between the first plate portion 31 and the second plate portion 32. In the first plate portion 31, the edge located at the tip of the first plate portion 31 is referred to as the first tip edge 31c, and the edge located at the tip of the second plate portion 32 is referred to as the second tip edge 32c. The first tip edge 31c and the second tip edge 32c have a thin dimension in the plate thickness direction and a dimension in the width direction H3 that is greater than the dimension in the plate thickness direction.

[0040] As described above, the peripheral wall 21 is formed by combining four of the bending members 30. Specifically, as shown in Fig. 3 or 5, the peripheral wall 21 is formed by arranging the four bending members 30 to form a rectangular frame. The four corners 23 of the peripheral wall 21 are formed by corner-forming portions 33 of the four bending members 30.

[0041] Each side wall 22 is formed by combining a first plate portion 31 of one of two circumferentially adjacent bending members 30 with a second plate portion 32 of the other. In other words, each side wall 22 is formed by overlapping the tip end portion of the first plate portion 31 of one circumferentially adjacent bending member 30 with the tip end portion of the second plate portion 32 of the other sleeve 20 in the plate thickness direction.

[0042] Here, the reference method refers to a method of forming the peripheral wall 21 while abutting the first tip edge 31c of the first plate portion 31 against the second tip edge 32c of the second plate portion 32 to form the side wall 22. Figure 3 shows the peripheral wall 21 formed by the reference method.

[0043] On the other hand, as shown in Figure 5, the reduction method is to form the peripheral wall 21 while the tip end of the first plate portion 31 of one of two adjacent bending members 30 is adjacent to the tip end of the second plate portion 32 of the other bending member 30 and overlapping the plate portions 31, 32 in the thickness direction to form the side wall 22.

[0044] In this case, it is preferable to uniformly determine which of the first plate portion 31 and the second plate portion 32 is on the outside in the overlapping direction in each of the four side walls 22. However, it is optional which of the first plate portion 31 and the second plate portion 32 is on the outside in the overlapping direction. When the first plate portion 31 is on the outside of the second plate portion 32 in the overlapping direction, the first inner surface 31a contacts the second outer surface 32b, and when the second plate portion 32 is on the outside of the first plate portion 31 in the overlapping direction, the second inner surface 32a contacts the first outer surface 31b.

[0045] When the four bending members 30 are combined to form the peripheral wall 21, if the side walls 22 are formed using the standard method, the circumferential dimension of each of the four side walls 22 will be maximum. On the other hand, if the side walls 22 are formed using the reduction method, the circumferential dimension of each of the four side walls 22 will be smaller than that of the side walls 22 formed using the standard method.

[0046] When the side wall 22 is formed by the reduction method, the greater the overlap amount between the first plate portion 31 and the second plate portion 32 along the circumferential direction of the peripheral wall 21, the smaller the dimension of the side wall 22 in the circumferential direction of the peripheral wall 21. In the peripheral wall 21 formed by the reduction method, the internal space K of the peripheral wall 21 can be expanded or contracted by increasing or decreasing the overlap length between the first plate portion 31 and the second plate portion 32.

[0047] The peripheral wall 21 has two sets of two opposing side walls 22 among the four side walls 22, and the overlapping lengths of the two side walls 22 constituting each set are the same. When the overlapping lengths of the two sets are the same, the peripheral wall 21 is formed in the shape of a square rectangular frame when viewed in the penetration direction Z, and when the overlapping lengths of the two sets are different, the peripheral wall 21 is formed in the shape of a rectangular rectangular frame when viewed in the penetration direction Z.

[0048] In each of the four side walls 22 of the peripheral wall 21, the tip of the first plate portion 31 and the tip of the second plate portion 32 are joined by a joining member 50. In this embodiment, the joining member 50 is aluminum tape.

[0049] In the standard method and the reduced method, the joining member 50 is attached across the first inner surface 31a at the tip of the first plate portion 31 and the second inner surface 32a at the tip of the second plate portion 32, or across the first outer surface 31b at the tip of the first plate portion 31 and the second outer surface 32b at the tip of the second plate portion 32. In the peripheral wall 21, each side wall 22 has one location where the tip of the first plate portion 31 and the tip of the second plate portion 32 overlap or adjoin. Therefore, there are four locations in the peripheral wall 21 where the two bending members 30 are joined by the joining member 50.

[0050] Adjacent two of the four bending members 30 are joined together by joining members 50, thereby assembling the four bending members 30 together and maintaining the rectangular frame shape of the peripheral wall 21. Therefore, the four joining members 50 function as maintaining members that maintain the shape of the peripheral wall 21. The sleeve 20 is composed of the peripheral wall 21 formed from the four bending members 30 and the four joining members 50.

[0051] 3, when the peripheral wall 21 is formed using the standard method, the first plate portion 31 and the second plate portion 32 that are adjacent in the circumferential direction in each side wall 22 are joined by the joining member 50 with the first leading edge 31c and the second leading edge 32c abutting against each other. Even when the peripheral wall 21 is formed using the standard method, the surfaces of the first plate portion 31 and the second plate portion 32 to which the joining member 50 is attached may be selected as appropriate.

[0052] The dimension of the peripheral wall 21 in the penetration direction Z is greater than the wall thickness of the fireproof hollow wall W. Therefore, when the sleeve 20 is placed in the through hole 14, both ends of the peripheral wall 21 in the penetration direction Z can protrude from the fireproof hollow wall W. Each of the four corners 23 of the peripheral wall 21 is a right angle.

[0053] In the through-hole structure including the sleeve 20 having the above configuration, the outer blocking member 16 disposed in the first hole 11a blocks the gap between the inner surface of the first hole 11a and the first outer surface 31b and second outer surface 32b of each bending member 30 that face the inner surface. In addition, the outer blocking member 16 disposed in the second hole 12a blocks the gap between the inner surface of the second hole 12a and the first outer surface 31b and second outer surface 32b of each bending member 30 that face the inner surface.

[0054] The outer blocking member 16 is compressed in the thickness direction between the inner surfaces of the holes 11a, 12a and the first outer surface 31b and second outer surface 32b of each bending member 30. The compressed and deformed outer blocking member 16 returns to its original shape, deforming along and contacting the inner surfaces of the holes 11a, 12a and the first outer surface 31b and second outer surface 32b of each bending member 30.

[0055] In each side wall 22 of the peripheral wall 21 formed by the reduction method, when the second plate portion 32 overlaps the outside of the first plate portion 31, a step is formed by the first outer surface 31b, the second tip edge 32c, and the second outer surface 32b, and when the first plate portion 31 overlaps the outside of the second plate portion 32, a step is formed by the second outer surface 32b, the first tip edge 31c, and the first outer surface 31b. The outer blocking member 16 deforms along and comes into contact with the step.

[0056] As described above, steps are formed in each side wall 22, but if the joining members 50 are adhered to the first inner surface 31 a and the second inner surface 32 a, the number of contact points between the sleeve 20 and the outer blocking member 16 will be reduced, so it is preferable that the joining members 50 be adhered to the first inner surface 31 a and the second inner surface 32 a. Furthermore, when the peripheral wall 21 is formed by the shrinking method, the joining members 50 can be adhered to the first inner surface 31 a and the second inner surface 32 a after the four bending members 30 are placed in the through hole 14, making it easier to match the size of the peripheral wall 21 to the through hole 14 and further easier to determine the position where the outer blocking member 16 is compressed.

[0057] The outer blocking member 16 is strip-shaped and its dimension in the penetration direction Z is smaller than that of the bending member 30. In addition, the outer blocking member 16 has a thickness greater than the dimension in the plate thickness direction of the bending member 30, and in the through-hole structure, the outer blocking member 16 is compressed and deformed by an amount of compression equal to or greater than the plate thickness of the bending member 30.

[0058] Next, a method for installing the sleeve 20 and a method for constructing the through-hole structure will be described. First, a case will be described in which a through-hole structure is constructed while installing a sleeve 20 using a reduction method. As shown in Fig. 7, one of the four corners of the through-hole 14 is designated as a first corner 14a, another corner adjacent to the first corner 14a in the horizontal direction is designated as a second corner 14b, another corner adjacent to the second corner 14b in the vertical direction is designated as a third corner 14c, and another corner adjacent to the first corner 14a and the third corner 14c is designated as a fourth corner 14d.

[0059] Of the pair of inner surfaces of through hole 14 that sandwich first corner 14a, one of the inner surfaces located between first corner 14a and fourth corner 14d is referred to as a first inner surface 141, and the other inner surface is referred to as a second inner surface 142. Of the pair of inner surfaces of through hole 14 that sandwich second corner 14b, one inner surface is referred to as the second inner surface 142, and the other inner surface is referred to as a third inner surface 143. Of the pair of inner surfaces of through hole 14 that sandwich third corner 14c, one inner surface is referred to as the third inner surface 143, and the other inner surface is referred to as a fourth inner surface 144. Of the pair of inner surfaces of through hole 14 that sandwich fourth corner 14d, one inner surface is referred to as the fourth inner surface 144, and the other inner surface is referred to as the first inner surface 141.

[0060] The four bending members 30 that form the sleeve 20 are designated as a first bending member 30a, a second bending member 30b, a third bending member 30c, and a fourth bending member 30d. First, as shown in Figures 6 and 7, outer blocking members 16 are placed along the four sides of the inner surface of the first hole 11a of the first partition wall 11. Similarly, outer blocking members 16 are placed along the four sides of the inner surface of the second hole 12a. As a result, the inner surfaces of the first hole 11a and the second hole 12a are covered by the outer blocking members 16. The thickness of each outer blocking member 16 is greater than the plate thickness of the four bending members 30.

[0061] Next, as shown in Figures 8 and 9, the corner forming portion 33 of the first bending member 30a is placed inside the through hole 14 so as to align with the first corner 14a of the through hole 14. The second plate portion 32 of the first bending member 30a is placed along the first inner surface 141, and the first plate portion 31 of the first bending member 30a is placed along the second inner surface 142. At this time, the first bending member 30a is supported by the second inner surface 142 via the outer blocking member 16. In addition, a gap remains between the first tip edge 31c of the first bending member 30a and the third inner surface 143, with the outer blocking member 16 sandwiched between them.

[0062] Next, the corner forming portion 33 of the second bending member 30b is aligned with the second corner 14b and placed inside the through hole 14. The second plate portion 32 of the second bending member 30b is placed along the second inner surface 142, and the first plate portion 31 of the second bending member 30b is placed along the third inner surface 143.

[0063] At this time, the tip end of the first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are overlapped in the plate thickness direction, so that the first inner surface 31a of the first plate portion 31 of the first bending member 30a comes into contact with the second outer surface 32b of the second plate portion 32 of the second bending member 30b.

[0064] The overlapping length of the first plate portion 31 and the second plate portion 32 is adjusted to match the dimension in the longitudinal direction of the second inner surface 142. At this time, the outer blocking member 16 arranged along the second inner surface 142 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the first bending member 30a, and the second outer surface 32b of the second plate portion 32 of the second bending member 30b, and the second inner surface 142. Then, the first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are joined by the joining member 50.

[0065] Next, as shown in FIG. 10 , the corner forming portion 33 of the third bending member 30c is placed in the through hole 14 so as to align with the third corner 14c. The second plate portion 32 of the third bending member 30c is placed along the third inner surface 143, and the first plate portion 31 of the third bending member 30c is placed along the fourth inner surface 144. At this time, the tip end of the first plate portion 31 of the second bending member 30b and the tip end of the second plate portion 32 of the third bending member 30c are overlapped in the plate thickness direction. Then, the first inner surface 31a of the first plate portion 31 of the second bending member 30b comes into contact with the second outer surface 32b of the second plate portion 32 of the third bending member 30c.

[0066] The overlapping length of the first plate portion 31 and the second plate portion 32 is adjusted to match the dimension in the longitudinal direction of the third inner surface 143. At this time, the outer blocking member 16 arranged along the third inner surface 143 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the second bending member 30b and the second outer surface 32b of the second plate portion 32 of the third bending member 30c and the third inner surface 143. Then, the first plate portion 31 of the second bending member 30b and the second plate portion 32 of the third bending member 30c are joined by the joining member 50.

[0067] Next, as shown in FIG. 11 , the corner forming portion 33 of the fourth bending member 30d is placed in the through hole 14 so as to align with the fourth corner 14d. The second plate portion 32 of the fourth bending member 30d is placed along the fourth inner surface 144, and the first plate portion 31 of the fourth bending member 30d is placed along the first inner surface 141. At this time, the tip end of the first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are overlapped in the plate thickness direction. Then, the first inner surface 31a of the first plate portion 31 of the third bending member 30c comes into contact with the second outer surface 32b of the second plate portion 32 of the fourth bending member 30d.

[0068] The overlapping length of the first plate portion 31 and the second plate portion 32 is adjusted to match the dimension in the longitudinal direction of the fourth inner surface 144. At this time, the outer blocking member 16 arranged along the fourth inner surface 144 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the third bending member 30c and the second outer surface 32b of the second plate portion 32 of the fourth bending member 30d and the fourth inner surface 144. Then, the first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are joined by the joining member 50.

[0069] Furthermore, the outer blocking member 16 arranged along the first inner surface 141 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the first outer surface 31b and first tip edge 31c of the first plate portion 31 of the fourth bending member 30d and the second outer surface 32b of the second plate portion 32 of the first bending member 30a and the first inner surface 141. Then, the first plate portion 31 of the fourth bending member 30d and the second plate portion 32 of the first bending member 30a are joined by the joining member 50.

[0070] As a result, a peripheral wall 21 is formed in the through hole 14 by the four bending members 30 and the four joining members 50, and the sleeve 20 is placed therein. Thereafter, the fluid pipe 13 is inserted into the sleeve 20, thereby completing the through hole structure.

[0071] In the through-hole structure, a fluid pipe 13 is disposed in a through-hole 14 that penetrates a fireproof hollow wall W in the wall thickness direction and is rectangular when viewed in the wall thickness direction. In the through-hole structure, the fluid pipe 13 is surrounded by a sleeve 20 in the through-hole 14. The sleeve 20 has a rectangular frame-shaped peripheral wall 21 formed by combining four bending members 30. Each of the four side walls 22 has two bending members 30 disposed adjacent to each other in the circumferential direction of the peripheral wall 21, and the tip ends of two adjacent bending members 30 overlap in the plate thickness direction of the bending members 30. In the through-hole structure, an outer blocking member 16 that is compressively deformed in the plate thickness direction of the bending members 30 is disposed between the overlapping bending members 30 and the inner surface of the through-hole 14.

[0072] It can be said that the installation method of the sleeve 20 includes the following steps. Specifically, the installation method of the sleeve 20 includes the steps of arranging the first to fourth bending members 30a to 30d in the through hole 14 and arranging two bending members 30 adjacent to each other so that the protruding directions of the first plate portion 31 and the second plate portion 32 extend in the circumferential direction of the peripheral wall 21. The installation method of the sleeve 20 also includes the step of overlapping, in the plate thickness direction, the tip end portion of the first plate portion 31 of one bending member 30 and the tip end portion of the second plate portion 32 of the other bending member 30, of the two bending members 30 adjacent in the circumferential direction of the peripheral wall 21, to form side walls 22, thereby forming the peripheral wall 21 having four side walls 22.

[0073] When forming the sleeve 20 using the standard method, the corner forming portion 33 of the first bending member 30a is positioned inside the through hole 14 so as to align with the first corner 14a of the through hole 14. The second plate portion 32 of the first bending member 30a is positioned along the first inner surface 141, and the first plate portion 31 of the first bending member 30a is positioned along the second inner surface 142. At this time, the first bending member 30a is supported by the second inner surface 142 via the outer blocking member 16.

[0074] Next, the corner forming portion 33 of the second bending member 30b is placed in the through hole 14 so as to align with the second corner 14b. The second plate portion 32 of the second bending member 30b is placed along the second inner surface 142, and the first plate portion 31 of the second bending member 30b is placed along the third inner surface 143. At this time, the first tip edge 31c of the first plate portion 31 of the first bending member 30a is butted against the second tip edge 32c of the second plate portion 32 of the second bending member 30b. The first plate portion 31 of the first bending member 30a and the second plate portion 32 of the second bending member 30b are joined together with a joining member 50.

[0075] Next, the corner forming portion 33 of the third bending member 30c is placed in the through hole 14 along the third corner 14c. The second plate portion 32 of the third bending member 30c is placed along the third inner surface 143, and the first plate portion 31 of the third bending member 30c is placed along the fourth inner surface 144. At this time, the first tip edge 31c of the first plate portion 31 of the second bending member 30b is butted against the second tip edge 32c of the second plate portion 32 of the third bending member 30c. The first plate portion 31 of the second bending member 30b and the second plate portion 32 of the third bending member 30c are joined by a joining member 50.

[0076] Next, the corner forming portion 33 of the fourth bending member 30d is placed along the fourth corner 14d inside the through hole 14. The second plate portion 32 of the fourth bending member 30d is placed along the fourth inner surface 144, and the first plate portion 31 of the fourth bending member 30d is placed along the first inner surface 141.

[0077] At this time, the first tip edge 31c of the first plate portion 31 of the third bending member 30c is butted against the second tip edge 32c of the second plate portion 32 of the fourth bending member 30d. The first plate portion 31 of the third bending member 30c and the second plate portion 32 of the fourth bending member 30d are joined by a joining member 50.

[0078] Furthermore, the first tip edge 31c of the first plate portion 31 of the fourth bending member 30d is butted against the second tip edge 32c of the second plate portion 32 of the first bending member 30a. Then, the second plate portion 32 of the first bending member 30a and the first plate portion 31 of the fourth bending member 30d are joined by a joining member 50. As a result, a peripheral wall 21 is formed inside the through hole 14, and the sleeve 20 is disposed therein.

[0079] Next, as shown in Figure 12, waterproof tape 60 is attached to the sleeve 20 and the fireproof hollow wall W so as to cover the outer blocking member 16, and then the sleeve 20 is positioned on the fireproof hollow wall W using positioning tape 61. The waterproof tape 60 may be attached only to the sleeve 20 or only to the fireproof hollow wall W. The waterproof tape 60 is made of a non-breathable material. By attaching the waterproof tape 60 so as to cover the outer blocking member 16, it is possible to prevent outside air from reaching the outer blocking member 16.

[0080] Thereafter, the fluid pipe 13 is inserted through the peripheral wall 21 of the sleeve 20. When the filler 15 is filled between the inner surface of the sleeve 20 and the insulating material 17 and the refractory member 18 on the outer periphery of the fluid pipe 13, the through-hole structure is completed.

[0081] According to the above embodiment, the following effects can be obtained. (1-1) The peripheral wall 21 of the sleeve 20 can be formed by combining four bending members 30. Then, by adjusting the overlap length between the first plate portion 31 and the second plate portion 32 of the bending members 30 that are adjacent in the circumferential direction of the peripheral wall 21, the dimension of the side wall 22 in the circumferential direction of the peripheral wall 21 can be adjusted, and the size of the peripheral wall 21 can be flexibly adjusted to match the size of the through hole 14. Therefore, it is no longer necessary to prepare multiple sleeves 20 to match the size of the through hole 14. Or, it is no longer necessary to form the through hole 14 to match the size of the sleeve 20.

[0082] (1-2) With the first plate portion 31 and the second plate portion 32 of two adjacent bending members 30 overlapping each other, the first plate portion 31 and the second plate portion 32 are joined by the joining member 50. This makes it possible to maintain the overlap length of the first plate portion 31 and the second plate portion 32, and to maintain a state adjusted to match the size of the through hole 14.

[0083] (1-3) The outer blocking member 16 is compressible and deformable. Therefore, the outer blocking member 16 is compressed in the thickness direction by more than the plate thickness of the bending member 30 between the outer surface of the peripheral wall 21 of the sleeve 20 and the inner surface of the through hole 14, and is pressed against the outer surface of the peripheral wall 21 and the inner surface of the through hole 14. Therefore, the outer blocking member 16 can close the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14.

[0084] In particular, when the peripheral wall 21 is formed by the shrinking method, a step is formed at the overlapping portion of the first plate portion 31 and the second plate portion 32, but the outer blocking member 16 deforms to follow the step, so that the outer blocking member 16 can close the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14. Furthermore, even if the corners of the through hole 14 are not right angles but have a rounded shape, or the inner surface of the through hole 14 is uneven, the outer blocking member 16 deforms to follow the shape of the through hole 14, so that the gap between the outer surface of the peripheral wall 21 and the inner surface of the through hole 14 can be closed.

[0085] (1-4) When the waterproof tape 60 is applied so as to cover the outer blocking member 16, the waterproof tape 60 is non-breathable, so that outside air is less likely to reach the outer blocking member 16. This prevents the outer blocking member 16 from becoming damp due to water vapor contained in the outside air. In addition, the waterproof tape 60 prevents the outer blocking member 16 from being exposed to the front side of the fireproof hollow wall W, thereby preventing deterioration of the outer blocking member 16.

[0086] (Second embodiment) Next, a second embodiment that embodies a sleeve, a through-hole structure, and a sleeve installation method will be described with reference to Figures 13 and 14. Note that the second embodiment is configured by simply changing the sleeve 20 of the first embodiment, and therefore detailed descriptions of similar parts will be omitted. Also, the circumferential direction, penetration direction Z, first direction H1, second direction H2, and width direction H3 defined in the first embodiment are the same in the second embodiment.

[0087] 13 and 14, the sleeve 70 has a rectangular frame-shaped peripheral wall 71. The peripheral wall 71 is made up of four bending members 30 as peripheral wall constituent bodies and four straight portion forming bodies 80 as peripheral wall constituent bodies.

[0088] The straight portion forming body 80 has a rectangular plate shape. The straight portion forming body 80 has a rectangular inner surface 81a on one side in the plate thickness direction and a rectangular outer surface 81b on the other side in the plate thickness direction. When the straight portion forming body 80 is viewed in the plate thickness direction, the direction in which the short sides of the inner surface 81a and the outer surface 81b extend is defined as the fourth direction H4. When the straight portion forming body 80 is used to form the sleeve 70, the direction in which the long sides of the inner surface 81a and the outer surface 81b of the straight portion forming body 80 extend is the same as the direction in which the long sides of the second inner surface 32a and the second outer surface 32b of the second plate portion 32 extend. In the straight portion forming body 80, the direction in which the long sides of the inner surface 81a and the outer surface 81b extend is defined as the width direction H3. The dimension of the straight portion forming body 80 in the width direction H3 is constant in the fourth direction H4. Therefore, the straight portion forming body 80 has a constant width that does not change along the fourth direction H4.

[0089] The peripheral wall 71 has four side walls 72 and four corners 73. The peripheral wall 71 is formed by combining four bending members 30 and four straight portion forming bodies 80. Specifically, the peripheral wall 71 is formed by combining and arranging the four bending members 30 and the four straight portion forming bodies 80 to form a rectangular frame. The four corners 73 of the peripheral wall 71 are formed by the corner forming portions 33 of the four bending members 30.

[0090] Each of the four side walls 72 is formed by combining a tip end portion of a first plate portion 31 of one of two bending members 30 positioned apart in the circumferential direction of the peripheral wall 71, a tip end portion of a second plate portion 32 of the other bending member 30, and one straight portion forming body 80 adjacent to and overlapping with both tip ends in the plate thickness direction so as to connect the tip end portion of the first plate portion 31 and the tip end portion of the second plate portion 32. In each side wall 72, the tip end portion of the first plate portion 31 overlaps one end portion of the straight portion forming body 80 in the fourth direction H4, and the tip end portion of the second plate portion 32 overlaps the other end portion of the straight portion forming body 80 in the fourth direction H4.

[0091] When the peripheral wall 71 is formed by combining the bending member 30 and the straight portion forming body 80, the greater the overlap amount between the first plate portion 31 and the second plate portion 32 relative to the straight portion forming body 80 along the circumferential direction of the peripheral wall 71, the smaller the dimension of the side wall 72 of the peripheral wall 71 in the circumferential direction. Conversely, the less the overlap amount between the first plate portion 31 and the second plate portion 32 relative to the straight portion forming body 80 along the circumferential direction of the peripheral wall 71, the larger the dimension of the side wall 72 of the peripheral wall 71 in the circumferential direction. The internal space K of the peripheral wall 71 can be expanded or contracted by increasing or decreasing the overlap length between the first plate portion 31 and the second plate portion 32 in the peripheral wall 71 along the circumferential direction of the peripheral wall 71.

[0092] In each of the four side walls 72 of the peripheral wall 71, the tip of the first plate portion 31 and the straight portion forming body 80, and the tip of the second plate portion 32 and the straight portion forming body 80 are joined by a joining member 50. It is preferable to uniformly determine which of the first plate portion 31, the second plate portion 32, and the straight portion forming body 80 is on the outside in the overlapping direction in each of the four side walls 72. However, it is optional to determine which of the first plate portion 31, the second plate portion 32, and the straight portion forming body 80 is on the outside in the overlapping direction.

[0093] Two joints are formed by the joining members 50 on each side wall 72. Therefore, eight joints are formed by the joining members 50 on the peripheral wall 71. By joining the four bending members 30 and the four straight portion forming bodies 80 with the joining members 50, the four bending members 30 and the four straight portion forming bodies 80 are assembled together and the shape of the peripheral wall 71 is maintained. The joining members 50 also serve as maintaining members that maintain the shape of the sleeve 70. The sleeve 70 is composed of the peripheral wall 71, which is formed from the four bending members 30 and the four straight portion forming bodies 80, and the joining members 50.

[0094] Therefore, according to the second embodiment, the following effects can be obtained in addition to the effects described in the first embodiment. (2-1) Each of the four side walls 72 of the peripheral wall 71 is formed from a first plate portion 31, a second plate portion 32, and a straight portion forming body 80. Even if two bending members 30 adjacent to each other in the circumferential direction of the peripheral wall 21 are spaced apart in the circumferential direction, the straight portion forming body 80 prevents the side walls 72 from being interrupted between the first plate portion 31 and the second plate portion 32, and allows each side wall 72 to be extended in the circumferential direction. Therefore, the internal space K of the peripheral wall 71 can be expanded.

[0095] (Third embodiment) Next, a third embodiment that embodies the sleeve, the through-hole structure, and the sleeve installation method will be described with reference to Figures 15 to 17. Note that the third embodiment is configured by simply changing the sleeve 20 and the fireproof hollow wall W of the first embodiment, and therefore detailed descriptions of similar parts will be omitted. Also, the circumferential direction, penetration direction Z, first direction H1, second direction H2, and width direction H3 defined in the first embodiment are the same in the third embodiment.

[0096] As shown in FIG. 15(a), the sleeve 82 of the third embodiment surrounds a penetrating member (not shown) in a rectangular through-hole Fa that penetrates a floorboard F serving as a partition wall. Examples of the penetrating member that penetrates the floorboard F include control cables, coaxial cables, and optical cables as wiring, and flexible electrical conduits made of synthetic resin, steel electrical conduits, and fluid pipes as piping materials. The sleeve 82 is used as a formwork for forming the through-hole Fa in the floorboard F. After the through-hole Fa is formed in the floorboard F by the sleeve 82, the sleeve 82 remains installed in the floorboard F.

[0097] 17, the through hole Fa has a rectangular shape in a plan view of the floorboard F viewed from above. A rectangular frame-shaped sleeve 82 is disposed within the through hole Fa. A penetrating member (not shown) is inserted into the sleeve 82, and thereby the penetrating member (not shown) penetrates the through hole Fa of the floorboard F.

[0098] The sleeve 82 has a peripheral wall 83 in the shape of a rectangular frame. The peripheral wall 83 has flanges 84 on both end edges in the penetration direction Z. The peripheral wall 83 is composed of two long side walls 83a that face each other across the internal space K, and two short side walls 83b that face each other across the internal space K. Therefore, the peripheral wall 83 has four side walls: the two long side walls 83a and the two short side walls 83b. The flanges 84 have a rectangular frame shape that protrudes outward from the sleeve 82.

[0099] As shown in Figures 15(a), 15(b) and 16, the peripheral wall 83 is composed of two outer polymers 85 as bending members of the peripheral wall constituent body, two inner polymers 90 as bending members, and an outer straight portion forming body 100 and an inner straight portion forming body 105 as peripheral wall constituent bodies.

[0100] The outer polymer 85 has a first plate portion 86 in the shape of a rectangular plate, a second plate portion 87 perpendicular to the first plate portion 86, a corner forming portion 88 located at the intersection of the first plate portion 86 and the second plate portion 87, and an outer flange forming portion 89 as a flange forming portion. The outer polymer 85 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The outer polymer 85 also has the corner forming portion 88 and two plate portions that protrude from the corner forming portion 88 perpendicular to each other in the protruding direction and have a constant width in the protruding direction, one plate portion being the first plate portion 86 and the other plate portion being the second plate portion 87.

[0101] The first plate portion 86 has a rectangular first inner surface 86a on one surface in the thickness direction and a rectangular first outer surface 86b on the other surface in the thickness direction. The second plate portion 87 has a rectangular second inner surface 87a on one surface in the thickness direction and a rectangular second outer surface 87b on the other surface in the thickness direction.

[0102] A first inner surface 86a of the first plate portion 86 and a second inner surface 87a of the second plate portion 87 are perpendicular to each other. A first outer surface 86b of the first plate portion 86 and a second outer surface 87b of the second plate portion 87 are perpendicular to each other. The first plate portion 86 has a constant width that does not change along a first direction H1, which is the direction of protrusion from the corner forming portion 88. The second plate portion 87 has a constant width that does not change along a second direction H2, which is the direction of protrusion from the corner forming portion 88. The dimension of the first plate portion 86 along the first direction H1 is different from the dimension of the second plate portion 87 along the second direction H2. The dimension of the first plate portion 86 along the first direction H1 is larger than the dimension of the second plate portion 87 along the second direction H2.

[0103] The outer flange forming portions 89 are located at both end edges of the outer polymer 85 in the penetration direction Z. The outer flange forming portions 89 are provided over the entire direction in which the first plate portion 86 protrudes from the corner forming portion 88 and over the entire direction in which the second plate portion 87 protrudes from the corner forming portion 88. In other words, the outer flange forming portions 89 are provided over the entire L-shape of the outer polymer 85. The outer flange forming portions 89 are composed of a base end flange portion 89a near the first plate portion 86 and the second plate portion 87, and a tip flange portion 89b protruding from the base end flange portion 89a.

[0104] The base end flange portion 89a and the tip flange portion 89b are offset in the penetration direction Z. The base end flange portion 89a is located closer to the first plate portion 86 and the second plate portion 87 than the tip flange portion 89b. Therefore, the outer flange forming portion 89 is formed in a stepped shape by the base end flange portion 89a and the tip flange portion 89b. In the outer flange forming portion 89, the base end flange portion 89a can be said to be located at a position recessed from the tip flange portion 89b in the penetration direction Z.

[0105] Each of the two outer flange forming portions 89 has a surface 89c of a base end flange portion 89a located at both ends in the penetration direction Z of the outer polymer 85, and a back surface 89d on the opposite side of the surface 89c in the thickness direction of the outer flange forming portion 89.

[0106] The outer polymer 85 has an outer overlapping step 85a in the center in the penetration direction Z. The outer overlapping step 85a is provided over the entire direction in which the first plate portion 86 protrudes from the corner forming portion 88 and over the entire direction in which the second plate portion 87 protrudes from the corner forming portion 88. In other words, the outer overlapping step 85a is provided over the entire L-shape of the outer polymer 85.

[0107] The outer overlapping step 85a is formed by causing the metal plate to bulge toward the first outer surface 86b of the first plate portion 86 and toward the second outer surface 87b of the second plate portion 87. The outer overlapping step 85a is recessed from the first inner surface 86a and the second inner surface 87a. The opening width of the outer overlapping step 85a along the penetration direction Z is constant throughout the entire L-shape of the outer polymer 85.

[0108] The outer overlapping step 85a has a plurality of holes 85b formed therein, which penetrate the outer overlapping step 85a in the thickness direction. The holes 85b are provided at equal intervals over the entire L-shape of the outer overlapping step 85a.

[0109] The inner polymer 90 has a first plate portion 91 in the shape of a rectangular plate, a second plate portion 92 perpendicular to the first plate portion 91, a corner forming portion 93 located at the intersection of the first plate portion 91 and the second plate portion 92, and an inner flange forming portion 94 as a flange forming portion. The inner polymer 90 is made of a metal plate that is L-shaped when viewed along the penetration direction Z and has a constant width in the penetration direction Z. The inner polymer 90 also has the corner forming portion 93 and two plate portions that protrude from the corner forming portion 93 perpendicularly to each other in the protruding direction and have a constant width in the protruding direction, one plate portion being the first plate portion 91 and the other plate portion being the second plate portion 92.

[0110] The first plate portion 91 has a rectangular first inner surface 91a on one surface in the thickness direction and a rectangular first outer surface 91b on the other surface in the thickness direction. The second plate portion 92 has a rectangular second inner surface 92a on one surface in the thickness direction and a rectangular second outer surface 92b on the other surface in the thickness direction.

[0111] The first inner surface 91a of the first plate portion 91 and the second inner surface 92a of the second plate portion 92 are perpendicular to each other. The first outer surface 91b of the first plate portion 91 and the second outer surface 92b of the second plate portion 92 are perpendicular to each other. The first plate portion 91 has a constant width that does not change along a first direction H1, which is the direction in which the first plate portion 91 protrudes from the corner forming portion 93. The second plate portion 92 has a constant width that does not change along a second direction H2, which is the direction in which the first plate portion 91 protrudes from the corner forming portion 93. The dimension of the first plate portion 91 along the first direction H1 is different from the dimension of the second plate portion 92 along the second direction H2. The dimension of the first plate portion 91 along the first direction H1 is larger than the dimension of the second plate portion 92 along the second direction H2.

[0112] The inner flange forming portions 94 are located at both end edges of the inner polymer 90 in the penetration direction Z. The inner flange forming portions 94 are provided over the entire direction in which the first plate portion 91 protrudes from the corner forming portion 93 and over the entire direction in which the second plate portion 92 protrudes from the corner forming portion 93. In other words, the inner flange forming portions 94 are provided over the entire L-shape of the inner polymer 90.

[0113] The inner flange forming portion 94 has a surface 94a located at both ends in the penetration direction Z, and a back surface 94b located on the opposite side of the surface 94a in the plate thickness direction of the inner flange forming portion 94. In the inner polymer 90, the dimension in the penetration direction Z between the two back surfaces 94b is slightly larger than the dimension in the penetration direction Z between the two front surfaces 89c in the outer polymer 85. Therefore, the inner polymer 90 and the outer polymer 85 can be combined with each other with the back surface 94b of the inner flange forming portion 94 of the inner polymer 90 facing the front surface 89c of the base end flange portion 89a of the outer polymer 85.

[0114] The inner polymer 90 has an inner overlapping step 90a in the center in the penetration direction Z. The inner overlapping step 90a is provided over the entire direction in which the first plate portion 91 protrudes from the corner forming portion 93, and over the entire direction in which the second plate portion 92 protrudes from the corner forming portion 93. In other words, the inner overlapping step 90a is provided over the entire L-shape of the inner polymer 90.

[0115] The inner overlapping step 90a is formed by bulging the metal plate toward the first outer surface 91b of the first plate portion 91 and toward the second outer surface 92b of the second plate portion 92. The thickness of the inner overlapping step 90a along the penetration direction Z is constant throughout the L-shape of the inner polymer 90. The thickness of the inner overlapping step 90a along the penetration direction Z is smaller than the opening width of the outer overlapping step 85a along the penetration direction Z. The inner overlapping step 90a has a plurality of holes 90b formed therein that penetrate the inner overlapping step 90a in the plate thickness direction. The plurality of holes 90b are arranged at equal intervals throughout the L-shape of the inner overlapping step 90a.

[0116] The outer straight portion forming body 100 has an outer main body portion 101 in the shape of a rectangular plate, outer flange forming portions 102 located at both end edges of the outer main body portion 101 in the penetration direction Z, and an outer bulge portion 103 located in the center of the outer main body portion 101 in the penetration direction Z.

[0117] The outer main body portion 101 has a rectangular inner surface 101a on one side in the plate thickness direction and a rectangular outer surface 101b on the other side in the plate thickness direction. The outer flange forming portions 102 are located on both end edges of the outer main body portion 101 in the penetration direction Z. The outer flange forming portions 102 are provided over the entire both end edges of the outer main body portion 101. The outer flange forming portions 102 are composed of a base end flange portion 102a closer to the outer main body portion 101 and a tip end flange portion 102b extending from the base end flange portion 102a.

[0118] The base end flange portion 102a and the tip flange portion 102b are offset in the penetration direction Z. The base end flange portion 102a is located closer to the outer main body portion 101 than the tip flange portion 102b. Therefore, the outer flange forming portion 102 is formed in a stepped shape by the base end flange portion 102a and the tip flange portion 102b. In the outer flange forming portion 102, the base end flange portion 102a can be said to be located at a position recessed from the tip flange portion 102b in the penetration direction Z.

[0119] Each of the two outer flange forming portions 102 has a surface 102c of the base end flange portion 102a located at both ends in the penetration direction Z of the outer straight portion forming body 100, and a back surface 102d on the opposite side of the surface 102c in the plate thickness direction of the outer flange forming portion 102.

[0120] Here, in the inner polymer 90, the dimension in the penetration direction Z between the two back surfaces 94b is slightly larger than the dimension in the penetration direction Z between the two front surfaces 102c in the outer straight portion forming body 100. Therefore, the inner polymer 90 and the outer straight portion forming body 100 can be combined with each other with the back surface 94b of the inner flange forming portion 94 of the inner polymer 90 facing the front surface 102c of the base end flange portion 102a of the outer straight portion forming body 100.

[0121] The outer bulging portion 103 is formed by bulging a metal plate toward the outer surface 101b of the outer main body portion 101. The opening width of the outer bulging portion 103 along the penetration direction Z is constant over the entire width of the outer main body portion 101 in the short side direction.

[0122] The inner straight portion forming body 105 has an inner main body portion 106 in the shape of a rectangular plate, inner flange forming portions 107 located at both end edges of the inner main body portion 106 in the penetration direction Z, and an inner bulge portion 108 located in the center of the inner main body portion 106 in the penetration direction Z.

[0123] The inner main body portion 106 has a rectangular inner surface 106a on one side in the plate thickness direction, and a rectangular outer surface 106b on the other side in the plate thickness direction. The inner flange forming portions 107 are located at both end edges of the inner main body portion 106 in the penetration direction Z. The inner flange forming portions 107 are provided over the entire both end edges of the inner main body portion 106. Each of the two inner flange forming portions 107 has a surface 107c located at both ends of the inner straight portion forming body 105 in the penetration direction Z, and a back surface 107d on the side opposite the surface 107c of the inner flange forming portion 107 in the plate thickness direction.

[0124] Here, in the inner straight portion forming body 105, the dimension in the penetration direction Z between the two back surfaces 107d is slightly larger than the dimension in the penetration direction Z between the two front surfaces 89c in the outer polymer 85. Therefore, the inner straight portion forming body 105 and the outer polymer 85 can be combined with each other with the back surface 107d of the inner flange forming portion 107 of the inner straight portion forming body 105 facing the front surface 89c of the base end flange portion 89a of the outer polymer 85.

[0125] The inner bulging portion 108 is formed by bulging a metal plate toward the outer surface 106b of the inner main body portion 106. The opening width of the inner bulging portion 108 is constant over the entire inner main body portion 106 in the short side direction.

[0126] Next, a method for installing the sleeve 82 and a method for constructing the through-hole structure will be described. As shown in Figure 17, the sleeve 82 of this embodiment is installed in the through hole Fa by previously integrating two outer polymers 85, two inner polymers 90, one outer straight section forming body 100, and one inner straight section forming body 105.

[0127] The two outer polymers 85 are arranged so that the two first plate portions 86 are aligned in the circumferential direction of the peripheral wall 83. In this case, the first plate portions 86 of the two outer polymers 85 may be spaced apart in the circumferential direction of the peripheral wall 83, or their tips may be in contact with each other.

[0128] The inner straight portion forming body 105 is arranged on the first inner surface 86a side of the first plate portion 86 of the two outer polymers 85, and the back surface 107d of the inner flange forming portion 107 of the inner straight portion forming body 105 faces the surface 89c of the outer flange forming portion 89 of each outer polymer 85. At this time, the tip ends of the two outer polymers 85 and the tip end of the inner straight portion forming body 105 are overlapped in the plate thickness direction. The outer overlapping step portion 85a and the inner bulging portion 108 of the overlapped outer polymer 85 and inner straight portion forming body 105 are mutually fitted and overlapped.

[0129] Then, the outer surface 106b of the inner main body portion 106 of the inner straight portion forming body 105 faces the first inner surfaces 86a of the two outer polymers 85. As a result, one long side wall 83a of the peripheral wall 83 is formed by the first plate portions 86 of the two outer polymers 85 and the inner straight portion forming body 105.

[0130] The two inner polymers 90 are arranged so that the two first plate portions 91 are aligned in the circumferential direction of the peripheral wall 83. In this case, the first plate portions 91 of the two inner polymers 90 may be spaced apart from each other in the circumferential direction of the peripheral wall 83, or their tips may be in contact with each other.

[0131] The outer straight portion forming body 100 is placed on the first outer surface 91b side of the two inner polymers 90, and the outer flange forming portion 102 of the outer straight portion forming body 100 faces the inner flange forming portion 94 of the two inner polymers 90. Then, the surface 102c of the outer flange forming portion 102 of the outer straight portion forming body 100 faces the back surface 94b of the inner flange forming portion 94 of each inner polymer 90. At this time, the tip ends of the two inner polymers 90 and the tip end of the outer straight portion forming body 100 are overlapped in the plate thickness direction. The overlapped inner polymer 90 and outer straight portion forming body 100 are overlapped with each other such that the inner overlap step portion 90a and the outer bulge portion 103 fit together.

[0132] Then, the inner surface 101a of the outer main body portion 101 of the outer straight portion forming body 100 faces the first outer surfaces 91b of the two inner polymers 90. As a result, one long side wall 83a of the peripheral wall 83 is formed by the first plate portions 91 of the two inner polymers 90 and the outer straight portion forming body 100.

[0133] Furthermore, the second plate portion 92 of the inner polymer 90 is disposed on each of the inner sides of the second plate portions 87 of the two outer polymers 85. The back surface 94b of the inner flange forming portion 94 of the inner polymer 90 faces the surface 89c of the outer flange forming portion 89 of each outer polymer 85. At this time, the tip end of the second plate portion 87 of the outer polymer 85 and the tip end of the second plate portion 92 of the inner polymer 90 are overlapped in the plate thickness direction. The outer overlapping step portion 85a and the inner overlapping step portion 90a of the overlapped outer polymer 85 and inner polymer 90 are overlapped with each other, fitting together.

[0134] As a result, the second outer surface 92b of the second plate portion 92 of the inner polymer 90 faces the second inner surface 87a of the second plate portion 87 of the outer polymer 85. As a result, the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 form two short side walls 83b of the peripheral wall 83.

[0135] The peripheral wall 83 has rectangular frame-shaped flanges 84 at both end edges in the penetration direction Z that protrude outward from the peripheral wall 83. The flanges 84 are formed in a rectangular frame shape by combining an outer flange-forming portion 89 of the two outer polymers 85, an inner flange-forming portion 94 of the two inner polymers 90, an outer flange-forming portion 102 of the outer straight portion forming body 100, and an inner flange-forming portion 107 of the inner straight portion forming body 105.

[0136] Two of the four corners of the peripheral wall 83 are formed by corner-forming portions 88 of the outer polymer 85 , and the remaining two are formed by corner-forming portions 93 of the inner polymer 90 . The outer flange forming portions 89 of the outer polymers 85 adjacent in the circumferential direction of the peripheral wall 83 and the inner flange forming portions 107 of the inner straight portion forming bodies 105 are overlapped in the plate thickness direction. In addition, the inner flange forming portions 94 of the inner polymers 90 adjacent in the circumferential direction of the peripheral wall 83 and the outer flange forming portions 102 of the outer straight portion forming bodies 100 are overlapped in the plate thickness direction. Furthermore, the outer flange forming portions 89 of the outer polymers 85 adjacent in the circumferential direction of the peripheral wall 83 and the inner flange forming portions 94 of the inner polymers 90 are overlapped in the plate thickness direction.

[0137] The peripheral wall 83 includes a pair of long side walls 83a facing each other and a pair of short side walls 83b facing each other. In one of the two long side walls 83a in one pair, two bending members positioned apart in the circumferential direction are outer polymers 85. The two outer polymers 85 are overlapped on the outside of the rectangular frame with an inner straight portion forming body 105, which serves as a first straight portion forming body connecting the outer polymers 85. In addition, the outer flange forming portions 89 of the two outer polymers 85 are overlapped on the other end edge side in the penetration direction Z with respect to the inner flange forming portion 107 of the inner straight portion forming body 105.

[0138] In the other long side wall 83a of one set of two long side walls 83a, the two bending members positioned circumferentially spaced apart are inner polymers 90. The two inner polymers 90 are overlapped on the inside of the rectangular frame with respect to an outer straight portion forming body 100, which serves as a second straight portion forming body connecting the inner polymers 90. In addition, the inner flange forming portions 94 of the two inner polymers 90 are overlapped on one edge side in the penetration direction Z with respect to the outer flange forming portion 102 of the outer straight portion forming body 100.

[0139] Each of the two short side walls 83b is composed of one set of two bending members, an outer polymer 85 and an inner polymer 90, which face each other across the internal space K. In each of the two short side walls 83b in the other set, the tip end of the second plate portion 87 of the outer polymer 85 overlaps with the tip end of the second plate portion 92 of the inner polymer 90 so as to be located outside.

[0140] Furthermore, in each long side wall 83a, the greater the amount of each inner polymer 90 polymerized onto the outer straight portion forming body 100 and the amount of each outer polymer 85 polymerized onto the inner straight portion forming body 105 along the circumferential direction of the peripheral wall 83, the smaller the dimension of the long side wall 83a in the circumferential direction of the peripheral wall 83. Conversely, the smaller the amount of each inner polymer 90 polymerized onto the outer straight portion forming body 100 and the amount of each outer polymer 85 polymerized onto the inner straight portion forming body 105 along the circumferential direction of the peripheral wall 83, the larger the dimension of the long side wall 83a in the circumferential direction of the peripheral wall 83.

[0141] When adjusting the overlap length of the long side wall 83a, the overlap length in the circumferential direction of the peripheral wall 83 is guided by the fit between the overlapped outer overlap step 85a and the inner bulge 108, and the fit between the inner overlap step 90a and the outer bulge 103.

[0142] Furthermore, in the pair of short side walls 83b, the greater the amount of overlap between the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 along the circumferential direction of the peripheral wall 83, the smaller the dimension of the short side walls 83b in the circumferential direction of the peripheral wall 83. Conversely, the less the amount of overlap between the second plate portion 87 of the outer polymer 85 and the second plate portion 92 of the inner polymer 90 along the circumferential direction of the peripheral wall 83, the larger the dimension of the short side walls 83b in the circumferential direction of the peripheral wall 83.

[0143] When adjusting the overlap length of the short side wall 83b, the overlapping outer overlapping step 85a and the overlapping inner overlapping step 90a fit together to guide the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. By increasing or decreasing the amount of overlap in the long side wall 83a and the short side wall 83b of the peripheral wall 83 in the circumferential direction of the peripheral wall 83, the internal space K of the peripheral wall 83 can be expanded or contracted.

[0144] Although not shown, in the long side wall 83a of the peripheral wall 83, the outer polymer 85 and the inner straight portion forming body 105, and the inner polymer 90 and the outer straight portion forming body 100 are joined by joining members similar to the joining member 50 shown in the first embodiment, and in the short side wall 83b, the outer polymer 85 and the inner polymer 90 are joined by joining members.

[0145] Two joining points are formed by the joining members on each long side wall 83a. One joining point is formed by the joining members on each short side wall 83b. Therefore, six joining points are formed by the joining members on the peripheral wall 83. By joining the two outer polymers 85, the two inner polymers 90, the outer straight portion forming body 100, and the inner straight portion forming body 105 with the joining members, they are assembled together and the shape of the peripheral wall 83 is maintained. The joining members also serve as maintaining members that maintain the shape of the sleeve 82.

[0146] The sleeve 82 is composed of two outer polymers 85, two inner polymers 90, an outer straight portion forming body 100, an inner straight portion forming body 105, and a connecting member. When the sleeve 82 is used as a form for forming the through hole Fa, the flange 84 is engaged with the periphery of the through hole Fa in the floor plate F.

[0147] The joining member may be a bolt or a tapping screw instead of aluminum tape. In this case, the bolt or tapping screw may be inserted into a hole 85b formed in the outer overlapping step portion 85a of the outer polymer 85, and the bolt or tapping screw may be screwed into the inner bulge portion 108 of the overlapping inner straight portion forming body 105 to join the outer polymer 85 and the inner straight portion forming body 105. Therefore, the hole 85b is a hole that allows the bolt or tapping screw to be threadably advanced or retreated.

[0148] Similarly, a bolt or tapping screw may be inserted into a hole 90b formed in the inner overlapping step 90a of the inner polymer 90, and the bolt or tapping screw may be screwed into the outer bulge 103 of the overlapping outer straight portion forming body 100 to join the inner polymer 90 and the outer straight portion forming body 100. Therefore, the hole 90b is a hole that allows the bolt or tapping screw to be threadedly advanced or retreated. Alternatively, a bolt or tapping screw may be inserted into the hole 85b of the outer polymer 85 or the hole 90b of the inner polymer 90, and the bolt or tapping screw may be screwed into the overlapping inner overlapping step 90a or the outer overlapping step 85a to join the outer polymer 85 and the inner polymer 90.

[0149] Therefore, according to the third embodiment, in addition to the effects (1-1) to (1-4) described in the first embodiment and the effect (2-1) described in the second embodiment, the following effect can be obtained. (3-1) The peripheral wall 83 has flanges 84 at both end edges in the penetration direction Z. In the flange 84, an outer flange forming portion 89 of the outer polymer 85 and an inner flange forming portion 107 of the inner straight portion forming body 105 overlap in the plate thickness direction. At this time, the inner flange forming portion 107 overlaps with a base end flange portion 89a that is recessed in the penetration direction Z more than a tip flange portion 89b of the outer flange forming portion 89. Therefore, the outer flange forming portion 89 and the inner flange forming portion 107 can be made flush with each other.

[0150] In addition, in the flange 84, the outer flange forming portion 102 of the outer straight portion forming body 100 and the inner flange forming portion 94 of the inner polymer 90 overlap in the plate thickness direction. At this time, the inner flange forming portion 94 overlaps with the base end flange portion 102a, which is recessed in the penetration direction Z more than the tip flange portion 102b of the outer flange forming portion 102. Therefore, the outer flange forming portion 102 and the inner flange forming portion 94 can be made flush with each other.

[0151] In addition, in the flange 84, an outer flange forming portion 89 of the outer polymer 85 and an inner flange forming portion 94 of the inner polymer 90 overlap in the plate thickness direction. At this time, the inner flange forming portion 94 overlaps a base end flange portion 89a that is recessed in the penetration direction Z more than a tip flange portion 89b of the outer flange forming portion 89. Therefore, the outer flange forming portion 89 and the inner flange forming portion 94 can be made flush with each other.

[0152] Furthermore, gaps between adjacent peripheral wall constituent bodies can be eliminated by overlapping the outer flange forming portion 89 with the inner flange forming portion 107, the outer flange forming portion 102 with the inner flange forming portion 94, and the outer flange forming portion 89 with the inner flange forming portion 94. Therefore, when forming the floor plate F, the flange 84 is engaged around the periphery of the through hole Fa in the floor plate F, but due to the overlapping of the flange forming portions, no gaps are formed between the through hole Fa and the peripheral wall 83, and it is possible to prevent concrete from entering the sleeve 82.

[0153] (3-2) When adjusting the overlap length of the long side wall 83a, the overlapped outer overlap step 85a fits into the inner bulging portion 108, and the adjustment of the overlap length in the circumferential direction of the peripheral wall 83 is guided by the sliding. Therefore, when adjusting the overlap length, it is possible to prevent the outer polymer 85 and the inner straight portion forming body 105 from shifting in the penetration direction Z.

[0154] Similarly, when adjusting the overlap length of the long side wall 83a, the fitting of the overlapped inner overlap step portion 90a and the outer bulging portion 103 guides the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. Therefore, when adjusting the overlap length, it is possible to prevent the inner polymer 90 and the outer straight portion forming body 100 from shifting in the penetration direction Z.

[0155] When adjusting the overlap length of the short side wall 83b, the fit between the overlapped outer overlap step portion 85a and the inner overlap step portion 90a slides to guide the adjustment of the overlap length in the circumferential direction of the peripheral wall 83. Therefore, when adjusting the overlap length, it is possible to prevent the outer polymer 85 and the inner polymer 90 from shifting in the penetration direction Z.

[0156] As a result, the overlap length of the peripheral wall 83 in the circumferential direction can be easily adjusted overall. This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0157] In the third embodiment, the peripheral wall 83 of the sleeve 82 may be composed of two outer polymers 85 and two inner polymers 90. That is, the peripheral wall 83 of the sleeve 82 may be composed of only two outer polymers 85 and two inner polymers 90 as four bending members. The peripheral wall 83 also has flanges 84 at both end edges in the penetration direction Z. The sleeve 82 of this form is formed by removing the outer straight portion forming body 100 and the inner straight portion forming body 105 from the peripheral wall 83 of the third embodiment and instead constituting the peripheral wall 83 with two outer polymers 85 and two inner polymers 90.

[0158] As shown in FIG. 18, each of the two long side walls 83 a in one set and each of the two short side walls 83 b in the other set is made up of an outer polymer 85 and an inner polymer 90 . At this time, in a pair of long side walls 83a, the outer polymer 85 and the inner polymer 90 face each other between the two long side walls 83a with the internal space K interposed therebetween, and in a pair of short side walls 83b, the outer polymer 85 and the inner polymer 90 face each other between the two short side walls 83b with the internal space K interposed therebetween. In other words, the two outer polymers 85 are located on a diagonal line of the peripheral wall 83, and the two inner polymers 90 are located on a diagonal line of the peripheral wall 83.

[0159] Therefore, for one outer polymer 85, a first plate portion 91 of one inner polymer 90 is arranged inside a first plate portion 86, and a second plate portion 92 of the other inner polymer 90 is arranged inside a second plate portion 87. Therefore, the two outer polymers 85 are arranged in a position where one outer polymer 85 is inverted upside down with respect to the other outer polymer 85, and the two inner polymers 90 are arranged in a position where one inner polymer 90 is inverted upside down with respect to the other inner polymer 90.

[0160] In the flange 84, the order of stacking in the thickness direction of circumferentially adjacent flange forming portions alternates in the circumferential direction. That is, in the flange 84, the order of stacking in the thickness direction of the outer flange forming portion 89 of the outer polymer 85 and the inner flange forming portion 94 of the inner polymer 90 alternates in the circumferential direction.

[0161] Two of the four corners of the peripheral wall 83 are formed by corner-forming portions 88 of the outer polymer 85 , and the remaining two are formed by corner-forming portions 93 of the inner polymer 90 . By configuring in this way, it is possible to provide a sleeve 82 with a smaller internal space K than the sleeve 82 of the third embodiment.

[0162] Furthermore, by adding an outer straight portion forming body 100 and an inner straight portion forming body 105 to the peripheral wall 83 of the sleeve 82 shown in Figure 18, it is possible to return to the sleeve 82 of the third embodiment and create a sleeve 82 with an expanded internal space K.

[0163] The method of installing the sleeve 20 in the first embodiment may be modified as follows. The outer blocking member 16 is arranged along the first inner surface 141 and the second inner surface 142. Next, as shown in FIG. 19 , the tip of the second plate portion 32 of the first bending member 30a and the tip of the first plate portion 31 of the fourth bending member 30d are overlapped in the plate thickness direction, and the adjacent first plate portion 31 and second plate portion 32 are joined with a joining member 50. When the first bending member 30a and the fourth bending member 30d are joined, a first assembly 51 is formed. This first assembly 51 includes one side wall 22, the first plate portion 31 protruding from one end of the side wall 22, and the second plate portion 32 protruding from the other end of the side wall 22.

[0164] The length of the side wall 22 formed in the first assembly 51 is adjusted by adjusting the overlapping length of the first plate portion 31 and the second plate portion 32 so that the length fits one of the four inner surfaces of the through-hole 14 . Then, the first assembly 51 is inserted into the through hole 14. At this time, the side wall 22 of the first assembly 51 is aligned with the surface of the inner surface of the outer blocking member 16 arranged in the through hole 14 that is aligned with the first inner surface 141. In addition, the first plate portion 31 is aligned with the second inner surface 142, and the second plate portion 32 of the fourth inner surface 144 is aligned with the second inner surface 142.

[0165] Next, the tip of the first plate portion 31 of the second bending member 30b and the tip of the second plate portion 32 of the third bending member 30c are overlapped in the plate thickness direction, and the adjacent first plate portion 31 and second plate portion 32 are joined with a joining member 50. When the second bending member 30b and the third bending member 30c are joined, a second assembly 52 is formed. This second assembly 52 includes one side wall 22, the first plate portion 31 protruding from one end of the side wall 22, and the second plate portion 32 protruding from the other end of the side wall 22.

[0166] The length of the side wall 22 formed in the second assembly 52 is adjusted by adjusting the overlapping length of the first plate portion 31 and the second plate portion 32 so that the length fits one of the four inner surfaces of the through-hole 14 . Then, the second assembly 52 is inserted into the through hole 14. At this time, the side wall 22 of the second assembly 52 is aligned along the surface of the inner surface of the outer blocking member 16 arranged in the through hole 14 that is aligned along the third inner surface 143, the second plate portion 32 is aligned along the second inner surface 142, and the first plate portion 31 is aligned along the fourth inner surface 144.

[0167] Furthermore, the first plate portion 31 of the first assembly 51 and the second plate portion 32 of the second assembly 52 are overlapped in the plate thickness direction to form the side wall 22. At the same time, the second plate portion 32 of the first assembly 51 and the first plate portion 31 of the second assembly 52 are overlapped in the plate thickness direction to form the side wall 22. At this time, the overlapping length of the first plate portion 31 and the second plate portion 32 is adjusted so that the length of the side wall 22 matches one of the four inner surfaces of the through hole 14. Then, in the first assembly 51 and the second assembly 52, the overlapped first plate portion 31 and second plate portion 32 are joined by the joining member 50.

[0168] The combination of the two bending members 30 forming the first assembly 51 and the combination of the two bending members 30 forming the second assembly 52 may be changed as appropriate. The method of installing the sleeve 20 in the first embodiment may be modified as follows.

[0169] The overlapping length of the first plate portions 31 and second plate portions 32 of adjacent bending members 30 is adjusted to form the peripheral wall 21, and the sleeve 20 is preliminarily formed by joining them with joining members 50. At this time, the overlapping length of the lengths of the four side walls 22 is adjusted so that they fit along the inner surface of the through hole 14 and so that the outer blocking member 16 can be put into a compressed state. The sized sleeve 20 is then placed inside the through hole 14.

[0170] The peripheral wall constituent may be a rectangular plate material. In this case, one corner 23 of the peripheral wall 21 is formed by combining two peripheral wall constituents in an L shape. Furthermore, one side wall 22 of the peripheral wall 21 is formed by combining at least two peripheral wall constituents. When the peripheral wall 21 is formed using a plurality of peripheral wall constituents, adjacent peripheral wall constituents may be joined by a joining member 50 or by welding. Alternatively, the peripheral wall constituents may be adhered to the inner surface of the through hole 14.

[0171] The bending member 30 does not have to be formed by bending a metal plate, but may be formed by shaping two metal plates of a certain width into an L shape with adhesive tape. In this configuration, the bending member 30 may be formed into an L shape at the installation site of the sleeve 20, or may be formed into an L shape in a factory.

[0172] The outer polymer 85 and the inner polymer 90 do not have to be formed by bending metal plates, but may be formed by two metal plates of a certain width into an L shape with adhesive tape. In this configuration, the outer polymer 85 and the inner polymer 90 may be formed into an L shape at the installation site of the sleeve 82, or may be formed into an L shape in a factory.

[0173] The joining member 50 is attached to the first plate portion 31 and the second plate portion 32 so as to span the first plate portion 31 and the second plate portion 32, but if the joining member 50 is double-sided tape, the joining member 50 may be interposed between the overlapping first plate portion 31 and the second plate portion 32 to join the first plate portion 31 and the second plate portion 32.

[0174] The joining member 50 was attached to the overlapping peripheral wall constituents so as to span the outer polymer 85 and the inner straight portion forming body 105, the inner polymer 90 and the outer straight portion forming body 100, and the outer polymer 85 and the inner polymer 90. However, when the joining member 50 is a double-sided tape, the joining member 50 may be interposed between the overlapping outer polymer 85 and the inner straight portion forming body 105, the inner polymer 90 and the outer straight portion forming body 100, and the outer polymer 85 and the inner polymer 90 to join them together.

[0175] In the bending member 30, the dimension of the first plate portion 31 in the first direction H1 and the dimension of the second plate portion 32 in the second direction H2 may be the same or may be changed as appropriate. Furthermore, in the outer polymer 85, the dimension of the first plate portion 86 in the first direction H1 and the dimension of the second plate portion 87 in the second direction H2 may be the same or may be changed as appropriate. In the inner polymer 90, the dimension of the first plate portion 91 in the first direction H1 and the dimension of the second plate portion 92 in the second direction H2 may be the same or may be changed as appropriate.

[0176] Adhesive tape may be attached over the entire circumferential direction of the peripheral wall 21, 71, 83 to maintain the rectangular cylindrical shape of the sleeve 20, 70, 82. In this case, the adhesive tape serves as a maintaining member.

[0177] In the first embodiment, the first plate portion 31 and the second plate portion 32 are overlapped by the two bending members 30 that constitute one side wall 22. However, the first plate portions 31 may be overlapped by the two bending members 30 that constitute one side wall 22. In this case, as shown in Fig. 20 , the side wall 22 that faces the side wall 22 formed by overlapping the first plate portions 31 also has the first plate portions 31 overlapped by the adjacent bending members 30. Therefore, the remaining two side walls 22 have the second plate portions 32 overlapped by the adjacent bending members 30.

[0178] When configured in this manner, the peripheral wall 21 formed has an elongated rectangular frame shape. Therefore, by selecting the plate portions to be overlapped, the peripheral wall 21 can be easily adjusted to fit the shape of the through hole 14. In other words, the bending member 30 includes a first plate portion 31 and a second plate portion 32 of different lengths. Therefore, by selecting the first plate portion 31 and the second plate portion 32 as the plate portions to be overlapped, the shape and size of the through hole 14 can be flexibly adjusted.

[0179] In the second embodiment, one set of side walls 72 of the peripheral wall 71 is formed using the first plate portion 31 and the second plate portion 32 of two bending members 30 positioned circumferentially apart from each other on the peripheral wall 71 and the straight portion forming body 80, and the remaining set of side walls 72 may be formed using the first plate portion 31 and the second plate portion 32 of two bending members 30 adjacent to each other on the peripheral wall 71 in the circumferential direction without using the straight portion forming body 80.

[0180] The partition wall does not have to be a hollow wall, but may be a solid wall. In the through-hole structure of the fire-resistant hollow wall W, the outer blocking member 16 may be omitted. The technical ideas that can be understood from the above-described embodiment and modified examples will be described.

[0181] <Appendix 1> A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is provided which is formed into a rectangular frame shape by combining four peripheral wall constituent bodies, If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall, Each of the four peripheral wall constituents is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The peripheral wall has four side walls; Each side wall is formed by overlapping a tip end of the plate portion of one of the peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall with a tip end of the plate portion of the other peripheral wall constituent in the plate thickness direction, and the internal space is expanded or contracted by changing the overlap length in the protruding direction.

[0182] <Appendix 2> A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates, The peripheral wall structure has four bending members and two or four straight portion forming members, If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall, Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The straight portion forming body has a shape extending with the constant width, The peripheral wall has four side walls; At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends, A sleeve characterized in that the internal space is expanded or contracted by changing the overlap length in the protruding direction.

[0183] <Appendix 3> A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A rectangular frame-shaped peripheral wall is provided which is formed by combining a plurality of peripheral wall constituent bodies, The direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, Each of the peripheral wall constituents is made of a metal plate having a plate portion with a constant width in the penetration direction, The peripheral wall has four side walls; each side wall is formed by overlapping a tip end portion of one of at least two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall with a tip end portion of the other peripheral wall constituent in the plate thickness direction, and the internal space is expanded or contracted by changing the overlap length of the peripheral wall in the circumferential direction.

[0184] <Appendix 4> a penetrating member is disposed in a through hole that penetrates the partition wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction; the penetrating member is surrounded by a sleeve within the through hole; the sleeve has a rectangular frame-shaped peripheral wall formed by combining a plurality of peripheral wall constituent bodies, The direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, The peripheral wall has four side walls; Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction, In the side wall, two of the peripheral wall constituents are arranged adjacent to each other in the circumferential direction of the peripheral wall, and tip portions of the two adjacent peripheral wall constituents overlap each other in the plate thickness direction of the peripheral wall constituents, A through-hole structure characterized in that an outer blocking member compressively deformed in the thickness direction of the peripheral wall constituent body is disposed between the overlapped peripheral wall constituent body and the inner surface of the through-hole.

[0185] <Appendix 5> A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising: The sleeve has a peripheral wall formed by combining four peripheral wall constituent bodies into a rectangular frame shape, If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction, Four peripheral wall constituents are arranged in the through hole, each of which is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction, A sleeve installation method comprising the step of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction to form the sleeve having the peripheral wall.

[0186] <Appendix 6> A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising: The sleeve comprises a peripheral wall formed in a rectangular frame shape by combining a first peripheral wall constituent, a second peripheral wall constituent, a third peripheral wall constituent, and a fourth peripheral wall constituent, and when a direction in which an internal space surrounded by the peripheral walls opens is defined as a penetration direction, each of the four peripheral wall constituents is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has an angular forming portion and two plate portions that protrude from the angular forming portion perpendicular to each other and have a constant width in the protruding direction, the first circumferential wall constituent is arranged so that the corner forming portion is aligned with a first corner that is one of the four corners of the through hole, the corner forming portion of the second circumferential wall constituent is aligned with a second corner adjacent to the first corner, and the first circumferential wall constituent and the second circumferential wall constituent are arranged so that a tip end portion of the plate portion of the first circumferential wall constituent and a tip end portion of the plate portion of the second circumferential wall constituent overlap on an inner surface between the first corner and the second corner, and the first circumferential wall constituent and the second circumferential wall constituent are joined together; the corner forming portion of the third circumferential wall constituent is aligned with a third corner adjacent to the second corner, and the tip end portion of the plate portion of the second circumferential wall constituent and the tip end portion of the plate portion of the third circumferential wall constituent are arranged so as to overlap on an inner surface between the second corner and the third corner, and the second circumferential wall constituent and the third circumferential wall constituent are joined together; a sleeve installation method comprising: aligning the corner forming portion of the fourth circumferential wall constituent with a fourth corner adjacent to the third corner; arranging the fourth circumferential wall constituent so that a tip end of the plate portion of the third circumferential wall constituent and a tip end of the plate portion of the fourth circumferential wall constituent overlap on an inner surface between the third corner and the fourth corner; joining the third circumferential wall constituent and the fourth circumferential wall constituent; and arranging the fourth circumferential wall constituent so that a tip end of the plate portion of the fourth circumferential wall constituent and a tip end of the plate portion of the first circumferential wall constituent overlap on an inner surface between the fourth corner and the first corner.

[0187] <Appendix 7> The joining member is a bolt that passes through both of the plate portions with the direction in which the tip ends of the plate portions overlap as the screw forward / backward direction, and the peripheral wall structure has a plurality of holes in the circumferential direction through which the bolts pass. <Appendix 8> A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising: The sleeve has a peripheral wall formed by combining four peripheral wall constituent bodies into a rectangular frame shape, If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction, Four peripheral wall constituents are arranged in the through hole, each of which is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction, A sleeve installation method comprising the step of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction to form the sleeve having the peripheral wall. <Appendix 9> A method for installing a sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, the method comprising: The sleeve has a peripheral wall formed by combining four peripheral wall constituent bodies into a rectangular frame shape, an outer blocking member having a thickness greater than the dimension in the thickness direction of the peripheral wall constituent member and capable of being compressed and deformed in the thickness direction by an amount of compression equal to or greater than the thickness of the peripheral wall constituent member is disposed along an inner surface of the through hole penetrating the partition wall; If the direction in which the internal space surrounded by the peripheral wall opens is defined as a penetration direction, and the direction in which the internal space is surrounded is defined as a circumferential direction, The peripheral wall constructor is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, and is disposed in the through hole; The plurality of peripheral wall constituents are adjacent to each other so that the protruding direction extends in the circumferential direction, a sleeve installation method comprising the steps of overlapping a tip end of the plate portion of one of the two adjacent peripheral wall constituents with a tip end of the plate portion of the other peripheral wall constituent in a plate thickness direction of both tip ends, changing the amount of overlap of both tip ends while compressing the outer blocking member, and joining both tip ends to form the sleeve comprising the peripheral wall. [Explanation of symbols]

[0188] F...floor panel as a partition wall, K...internal space, W...fire-resistant hollow wall as a partition wall, 13...fluid pipe as a penetrating member, Fa, 14...penetrating hole, 16...outer blocking member, 20, 70, 82...sleeve, 21, 71, 83...peripheral wall, 22, 72...side wall, 30...bending member as a peripheral wall constituent body, 31, 86, 91...first plate portion, 32, 87, 92...second plate portion, 33, 88, 93...angle forming portion, 50...maintenance member and joint member, 80...straight portion forming body as a peripheral wall constituent body, 83a...side Long side wall as wall, 83b...short side wall as side wall, 84...flange, 85...outer polymer, 85a...outer polymer step as guide portion, 89, 102...outer flange forming portion, 90...inner polymer, 90a...inner polymer step as guide portion, 94, 107...inner flange forming portion, 100...outer straight portion forming body as second straight portion forming body, 103...outer bulge portion as guide portion, 105...inner straight portion forming body as first straight portion forming body, 108...inner bulge portion as guide portion.

Claims

1. A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates, The peripheral wall structure has four bending members and two or four straight portion forming members, If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall, Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The straight portion forming body has a shape extending with the constant width, The peripheral wall has four side walls; At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the plate portion of the other of the two bending members positioned apart in the circumferential direction of the peripheral wall, and the straight portion forming body overlapped in the plate thickness direction from the inside or outside of the rectangular frame shape with respect to both tip ends so as to connect the two tip ends, A sleeve characterized in that the internal space is expanded or contracted by changing the overlap length in the protruding direction.

2. A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates, The peripheral wall structure has four bending members and two or four straight portion forming members, If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall, Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The straight portion forming body has a shape extending with the constant width, The peripheral wall has four side walls; At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends, A sleeve characterized in that the internal space can be expanded or contracted by changing the overlap length in the protruding direction to form the rectangular frame shape of different sizes.

3. A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent members made of metal plates, The peripheral wall structure has four bending members and two or four straight portion forming members, If the direction in which the internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall, Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion and two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, The straight portion forming body has a shape extending with the constant width, The peripheral wall has four side walls; At least two of the four side walls are composed of a tip end portion of the plate portion of one of the two bending members positioned apart in the circumferential direction of the peripheral wall, a tip end portion of the other plate portion, and the straight portion forming body overlapped with both tip ends in the plate thickness direction so as to connect the two tip ends, The internal space is expanded or contracted by changing the overlap length in the protruding direction, The peripheral wall has a rectangular frame-shaped flange that protrudes outward from the peripheral wall at one end edge in the penetration direction, and all of the plurality of peripheral wall constituents have plate-shaped flange forming portions that form the flange at one end edge in the penetration direction, and two flange forming portions adjacent to each other in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions, The peripheral wall includes two sets of two side walls facing each other among the four side walls, Each of the two side walls of one of the sets is constituted by two of the bending members and one of the straight portion forming bodies, and each of the side walls of the other set is constituted by two of the bending members of one of the sets that face each other across the internal space, In one of the two side walls of one of the sets, the two bending members positioned apart in the circumferential direction are outer polymers that overlap with the first straight portion forming body connecting the two bending members on the outside of the rectangular frame shape, and the flange forming portion is overlapped on the other end edge side in the penetration direction relative to the flange forming portion of the first straight portion forming body, In the other side wall of one of the two side walls of the pair, the two bending members positioned apart in the circumferential direction are inner polymers that are polymerized on the inside of the rectangular frame shape with respect to the second straight portion forming body connecting the two bending members, and the flange forming portion is polymerized on one end edge side in the penetration direction relative to the flange forming portion of the second straight portion forming body, A sleeve characterized in that in each of the two side walls of the other set, the tip of the plate portion of the outer polymer is overlapped so as to be more outer than the tip of the plate portion of the inner polymer.

4. A sleeve that penetrates a partition wall in a wall thickness direction and surrounds a penetrating member that is disposed in a through hole that is rectangular when viewed in the wall thickness direction, A peripheral wall is provided which is formed into a rectangular frame shape by combining a plurality of peripheral wall constituent bodies made of metal plates, and the direction in which an internal space surrounded by the peripheral wall opens is defined as the penetration direction of the peripheral wall. The peripheral wall has flanges that protrude outward from both end edges in the penetration direction, The peripheral wall structure has four bending members, Each of the four bending members is L-shaped when viewed along the penetration direction, is made of a metal plate having a constant width in the penetration direction, and has a corner forming portion, two plate portions that protrude perpendicularly from the corner forming portion and have a constant width in the protruding direction, and a plate-shaped flange forming portion that forms the flange, The four bending members are arranged such that the protruding direction of the plate portions from the corner forming portion is the circumferential direction of the peripheral wall, and the plate portions of the bending members adjacent to each other in the circumferential direction are overlapped in the plate thickness direction, so that the peripheral wall is formed into the rectangular frame shape, thereby constituting four side walls, The two flange forming portions adjacent to each other in the circumferential direction are overlapped in the plate thickness direction of the flange forming portions, The sleeve is capable of changing the expansion and contraction of the internal space by changing the overlap length in the protruding direction, two of the four bending members that are located at one diagonal corner and spaced apart in the circumferential direction of the peripheral wall are outer polymers that polymerize with the two bending members that are located at the other diagonal corner on the outside of the rectangular frame shape, and the two bending members that are located at the other diagonal corner are inner polymers that polymerize with the outer polymer on the inside of the rectangular frame shape, the flange forming portion at one of the both end edges of the inner polymer overlaps with the flange forming portion at one end edge of the both end edges of the outer polymer at one end side in the penetration direction, A sleeve characterized in that the flange forming portion at the other end edge of the inner polymer overlaps with the flange forming portion at the other end edge of the outer polymer at the other end side in the penetration direction.

5. A sleeve as described in claim 3 or claim 4, wherein one of the overlapping flange forming portions is formed in a stepped shape in the plate thickness direction, and the other of the overlapping flange forming portions overlaps with the step of the flange forming portion of the other of the overlapping flange forming portions, so that the overlapping flange forming portions are flush with each other.

6. The sleeve according to any one of claims 1 to 5, wherein the length from the base end to the tip of one of the two plate portions of the peripheral wall constituent is different from the length from the base end to the tip of the other plate portion.

7. The sleeve according to any one of claims 1 to 6, further comprising an outer blocking member that has a thickness greater than the dimension in the thickness direction of the peripheral wall constituent and that can be compressed and deformed in the thickness direction by an amount of compression equal to or greater than the thickness of the peripheral wall constituent.

8. a penetrating member is disposed in a through hole that penetrates the partition wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction; The penetrating member is surrounded by the sleeve according to any one of claims 1 to 7, which is disposed in the through hole; The sleeve has a rectangular frame shape formed by combining a plurality of peripheral wall constituent bodies, Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction, The two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall have tip portions overlapping each other in the plate thickness direction of the peripheral wall constituents, A through-hole structure characterized in that an outer blocking member compressively deformed in the thickness direction of the peripheral wall constituent body is disposed between the overlapped peripheral wall constituent body and the inner surface of the through-hole.

9. The partition wall is a hollow wall formed by a pair of partition walls that form a cavity therebetween, and a penetrating member is disposed in a through hole that penetrates the hollow wall in a wall thickness direction and has a rectangular shape when viewed in the wall thickness direction, The penetrating member is surrounded by the sleeve according to any one of claims 1 to 7, which is disposed in the through hole; Each of the plurality of peripheral wall constituents is made of a metal plate having a constant width in the penetration direction that is greater than the wall thickness of the hollow wall, A through-hole structure characterized in that two peripheral wall constituents adjacent to each other in the circumferential direction of the peripheral wall are positioned in the hollow wall with their tip portions overlapping each other in the plate thickness direction of the peripheral wall constituents.

10. The through hole structure according to claim 9, wherein one end of the sleeve in the penetration direction protrudes from the surface of the partition wall, and the sleeve is positioned relative to the partition wall by positioning tape attached across the outer surface of the sleeve protruding from the partition wall and the surface of the partition wall.

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