Heat insulating structure for steel-framed building

Abstract

In this heat insulating structure which is for a steel-framed building and which forms a heat insulating line by installing a board-like heat insulating material (31) in a structural plane of a skeleton framework (1), a fixture (7) for supporting a ceiling substrate or the like is attached onto the indoor side of a beam member (2) while minimizing the loss of the heat insulating line. The fixture (7) includes a pair of left and right side plates (71, 71), and a connecting piece (73) for connecting the rear portions of the side plates to each other. A groove part (72) capable of engaging with a lower flange (21) of a beam member (2) is formed in each side plate (71). When the side plate (71) is inserted from the indoor side of an under-beam heat insulating material (31) and a cross-beam heat insulating material (32) into the vicinity of an abutting location of both heat insulating materials (31, 32) and the groove part (72) is engaged with the lower flange (21), the fixture (7) is fixed to the beam member (2) through both the heat insulating materials (31, 32). The rear side part of the fixture (7) is exposed to the indoor side from both the heat insulating materials (31, 32), and a hanging bolt (8) or the like for supporting the ceiling substrate is attached thereto.

Description

Insulation structure of steel-frame buildings

[0001] The invention disclosed in this application relates to an insulating structure for steel-framed buildings.

[0002] A known insulation structure involves installing insulating interior wall base panels within the structural plane of a steel-framed building, enclosed by columns and beams on the outer perimeter, or on the indoor side of said structural plane, to form an insulation line, and then installing interior wall finishing materials such as gypsum board or wallpaper on the indoor side of these interior wall base panels. Here, "insulation line" refers to a conceptual boundary line (boundary surface) formed by placing insulating materials on the outer walls, roof, ceiling, under the floor, etc., to block heat transfer between the inside and outside of the building and maintain a comfortable indoor environment. In such an insulation structure, the outer frame of the interior wall base panel is made of wood or lightweight steel, and a board-shaped insulating material made of a foamed resin molded body such as polystyrene foam is attached within the frame. The applicant has also proposed and put into practical use such an insulation structure in which interior wall base panels are installed within the structural plane of a steel-framed building, for example in Patent Document 1.

[0003] In such an insulating structure, the interior wall base panel is fixed to the columns and beams that constitute the structural frame via metal fasteners. These fasteners are composed of, for example, a panel holding part that holds the upper part of the frame of the interior wall base panel and a beam fixing part that is attached to the lower flange of a beam made of H-shaped steel. Patent Document 1 also discloses a fastener (referred to as a "fixing bracket" in the same document) in which a main body that can be fitted onto the upper part of the interior wall base panel from above and a beam fixing part that can engage with the lower flange of a beam are bolted together. Furthermore, similar fasteners that can engage with the lower flange of a beam are also used as ceiling suspension brackets for suspending ceiling base materials (such as joist hangers) provided on the indoor side of the structural frame (for example, Patent Document 2, etc.).

[0004] However, in the heat insulation structure as described above, even if the inner wall base panel is built in slightly separated from the building frame, a heat bridge is formed through the fixture that connects the beam material and the inner wall base panel, which may become a weakness in the heat insulation design. This concern becomes particularly significant when lightweight steel materials with high thermal conductivity are used for the frame of the inner wall base panel. The same applies to the ceiling suspension brackets for suspending the ceiling base material. Also, the gap itself formed between the building frame and the inner wall base panel or the ceiling base around the installation location of the fixture is likely to be a break in the heat insulation line.

[0005] Therefore, the applicant of the present application has commercialized a heat insulation structure in which a board-shaped heat insulation material made of a rigid foamed resin molded body with excellent self-supporting properties and easy to obtain uniform heat insulation performance is built directly into the plane of the building frame alone. For example, it is disclosed in Patent Document 3 and the like. In that heat insulation structure, dedicated fixtures are respectively attached above the foundation and under the beam, and the lower edge and upper edge of the heat insulation material are fixed in proximity to the foundation and the beam material, thereby reducing the exposed portion of the metal fixture and making it difficult to generate a heat bridge. Also, the indoor surface of the heat insulation material (under-beam heat insulation material) built directly under the beam material is made to protrude indoors beyond the side edge of the beam material, and a board-shaped heat insulation material (cross-beam heat insulation material) is also fitted into the side concave portion (the recess of the H-shaped steel) on the indoor side of the beam material. By aligning the indoor surfaces of the cross-beam heat insulation material and the under-beam heat insulation material flush, a continuous heat insulation line is formed between the building frame and the inner wall base or the ceiling base. By laminating a resin film material on the indoor side of the heat insulation line, it is also possible to further improve the airtightness, moisture-proof, fire resistance performance, etc. of the building.

[0006] Japanese Patent Application Laid-Open No. 10-266417, Utility Model Publication No. 05-023688, Japanese Patent Application Laid-Open No. 2023-108965

[0007] In the heat insulation structure as disclosed in Patent Document 3, the under-beam heat insulation material built directly under the beam material and the cross-beam heat insulation material covering the side concave portion on the indoor side of the beam material are arranged with their indoor surfaces protruding indoors beyond the side edge of the beam material. Then, the beam material is hidden by these heat insulation materials, making it difficult to attach fixtures such as the ceiling suspension bracket disclosed in Patent Document 2 to the lower flange of the beam material.

[0008] The invention disclosed herein was conceived to improve upon such inconveniences, and aims to propose an insulation structure in which a board-shaped insulation material made of a foamed resin molded body is installed within the structural plane of the frame of a steel-framed building to form an insulation line, while minimizing defects in the insulation line and allowing for easy attachment of fasteners for supporting ceiling substrates and interior substrates to the indoor side of the beam material.

[0009] To achieve the aforementioned objective, the present invention discloses an insulation structure for a steel-framed building in which a structural plane of the building frame is formed by columns and beams on the outer perimeter, the beams are shaped steel members having a lower flange that protrudes toward the interior, a board-shaped under-beam insulation material made of a foamed resin molded body is erected within the structural plane of the building frame, the interior side of the beams is covered with a board-shaped transverse beam insulation material made of a foamed resin molded body, and the interior surface of the under-beam insulation material and the interior surface of the transverse beam insulation material are arranged to protrude further inward than the beams, wherein a pair of left and right side plates forming thin plates are placed opposite each other at appropriate intervals, The fastener is provided with a connecting piece that connects the rear portions of both side plates in the left-right direction, and each side plate has a groove formed therein that opens forward so as to engage with the lower flange. The front portion of the side plate is inserted from the indoor side of the lower beam insulation material and the transverse beam insulation material near the abutting point of the two insulation materials, and the groove is engaged with the lower flange, thereby fixing the fastener to the beam material through the two insulation materials. At the same time, the rear portion of the fastener is kept exposed on the indoor side of the two insulation materials, and a support member that supports the ceiling base material or interior base material is attached to the rear portion of the fastener.

[0010] Furthermore, the invention disclosed in this application adopts a configuration in which, in the aforementioned insulation structure for a steel-framed building, a film material is superimposed on the indoor side of the under-beam insulation material and the transverse-beam thermal material, and the fastener is fixed to the beam material through the film material.

[0011] Furthermore, the invention disclosed in this application adopts a configuration in which the side plates of the fastener are integrally connected to each other via a rear-end connecting piece provided in the direction of extension of the groove.

[0012] Furthermore, the invention disclosed in this application adopts a configuration in which, in the aforementioned steel-frame building insulation structure, the groove portion of the side plate is formed such that the groove spacing in the vertical direction gradually decreases from the front end to the rear, and the area near the opening end expands diagonally toward the front, with the inner edge of the diagonally expanded groove portion approaching the upper and lower edges of the side plate, respectively.

[0013] As described above, with the insulation structure of a steel-framed building, board-shaped insulation material is positioned so as to protrude into the interior side of the structural frame. Even if the beam material is hidden from view from the interior by this insulation material, fasteners for supporting ceiling and interior finishes can be easily attached to the lower flange of the beam material. Since the only part of the fastener that penetrates the insulation material is a thin plate-like side panel, the loss of insulation lines is minimized. Even if a film material with functions such as airtightness, moisture resistance, and fire resistance is attached to the interior side of the insulation material, the side panels of the fasteners can be pierced through these films and secured without any particular problems.

[0014] This is a longitudinal cross-sectional view showing one embodiment of the thermal insulation structure for a steel-framed building according to the invention disclosed in this application. This is a perspective view of a fastener used in the thermal insulation structure of Figure 1. This is a three-view drawing of the fastener of Figure 2, where (a) is a front view of the front end, (b) is a top view, and (c) is a side view. This is a perspective view showing a modified example of the fastener. This is a three-view drawing of the fastener of Figure 4, where (a) is a front view of the front end, (b) is a top view, and (c) is a side view. This is a longitudinal cross-sectional view of a thermal insulation structure using the fastener of Figure 4.

[0015] Hereinafter, embodiments of the invention disclosed in this application will be described with reference to the drawings. Figure 1 shows one embodiment of the thermal insulation structure for a steel-framed building according to the invention disclosed in this application, and Figures 2 and 3 show the specific configuration of the fasteners used in the thermal insulation structure of Figure 1.

[0016] This insulation structure involves installing board-shaped insulation material (hereinafter referred to as "beam under-insulation material 31") towards the interior side of the structural frame 1, which is surrounded by multiple column members (not shown) and one or more beam members 2 arranged on the outer perimeter, and also attaching board-shaped insulation material (hereinafter referred to as "beam transverse insulation material 32") to the interior side of the beam members 2, thereby forming an insulation line on the interior side of the structural frame 1. While H-shaped steel is typically used for the beam members 2, channel steel or joined steel sections (such as two channel steel sections joined together) can also be used, as long as they have at least one lower flange 21 that extends horizontally toward the interior. An exterior wall material 4 is attached to the exterior side of the structural frame 1 via appropriate mounting means (not shown). A wall ventilation layer may be formed between the exterior wall material 4 and the structural frame 1. On the indoor side of the structural frame 1, interior wall base panels 51 and gypsum boards 52 that constitute the interior wall base, and ceiling joist hangers 53 and ceiling joists 54 that constitute the ceiling base are assembled.

[0017] In this insulation structure, the "board-shaped insulation material" refers to a flat molded body made of a rigid foamed resin (polystyrene foam, polyethylene foam, urethane foam, phenolic foam, etc.) with a thickness of several centimeters to more than ten centimeters. The under-beam insulation material 31 is formed so that its height matches the under-beam dimension (the height from the top of the foundation or the surface of the floor base material such as the ALC floor slab to the bottom surface of the beam 2), and is fixed in place via appropriate insulation material mounting members so as not to fall over in the indoor or outdoor direction. The height that "matches the under-beam dimension" here means the height at which the upper edge of the under-beam insulation material 31 abuts against or is close to the bottom surface of the beam 2 and is held in place without difficulty, and is approximately the same as the under-beam dimension or a few millimeters smaller. The under-beam insulation material 31 is positioned so that its indoor surface protrudes slightly inward from the side edge of the lower flange 21 of the beam 2, and is installed so as to be adjacent to the beam 2 without any gaps along its length.

[0018] In the example configuration, the beam transverse thermal insulation material 32 is placed on the indoor side of the beam member 2 so as to close the recessed side of the beam member 2 (the cavity of the H-shaped steel) on the indoor side, after the fibrous insulation material 33 has been filled into the recessed side of the beam member 2. The beam transverse thermal insulation material 32 is positioned so that its upper edge abuts against the bottom surface of the floor slab 6 of the upper floor, and its lower edge rests on the upper edge of the beam under-insulation material 31 which protrudes more inward than the side edge of the lower flange 21. The contact points between the beam transverse thermal insulation material 32 and the beam under-insulation material 31 may be fixed by sealing with adhesive tape or the like. In the example configuration, the beam transverse thermal insulation material 32 protrudes slightly more inward than the beam under-insulation material 31, but the indoor surfaces of both insulation materials 31 and 32 may be flush. Alternatively, instead of filling the recessed portion of the beam member 2 with fibrous insulation material 33, a thick board-shaped beam transverse thermal material may be fitted into substantially the entire recessed portion, or multiple board-shaped insulation materials may be stacked and fitted together.

[0019] In this way, a continuous insulation line is formed on the indoor side of the structural frame 1 of the outer perimeter of the steel-framed building, with the under-beam insulation material 31 and the transverse beam thermal material 32 being seamlessly connected. By making the indoor surfaces of the under-beam insulation material 31 and the transverse beam thermal material 32 protrude slightly inward from the side edge of the lower flange 21 of the beam 2, it is possible to prevent the lower flange 21 of the beam 2 from protruding indoors beyond the insulation line and forming a thermal bridge. A suitable film material 34 having functions such as airtightness, moisture resistance, and fire resistance may be applied to the indoor side of this insulation line. In the example embodiment, the upper part of the film material 34 is stretched so as to wrap around from the upper edge of the transverse beam thermal material 32 to the back surface. The ceiling and interior wall substrates surrounding the indoor space are assembled so as to be separated from this insulation line.

[0020] The essential part of the invention disclosed in this application is a structure for attaching a fastener 7 for supporting ceiling substrates and interior substrates from the indoor side to the lower flange 21 of the beam member 2, which is covered by such an insulating line. Embodiments of the fastener 7 are shown in Figures 2 and 3. In the following description of the positional relationships and directions of operation of each part of the fastener 7, the viewpoint from which a worker on the indoor side of the structural frame 1 attaches the fastener 7 to the beam member 2 (leftward viewpoint in Figure 1) will be used as the reference point, with the outdoor side being referred to as the front, the indoor side as the rear, and the direction parallel to the length of the beam member 2 (direction perpendicular to the surface in Figure 1) as the left-right direction (width direction).

[0021] The fastener 7 is a component comprising a pair of side plates 71, 71 placed opposite each other in the left-right direction at an appropriate interval, and a connecting piece 73 that connects the rear portions of both side plates 71, 71 in the left-right direction, and these are integrally formed by bending a metal plate such as a steel plate.

[0022] Each side plate 71 is a thin plate of uniform thickness with no irregularities or bends in the thickness direction, and the lower edge 711 of the rear portion is cut out in a roughly rectangular shape when viewed from the side. A groove 72 that can engage with the lower flange 21 of the beam member 2 is formed on the front portion of each side plate 71 and opens toward the front.

[0023] As shown in Figure 3, the groove portion 72 is formed such that the groove spacing in the vertical direction gradually decreases from the front end towards the rear. This groove spacing corresponds to multiple types (three types in the example embodiment) of the thickness of the lower flange 21 of the beam member 2. Near the opening end of the groove portion 72, it expands diagonally toward the front to facilitate the acceptance of the lower flange 21 of the beam member 2, and the groove spacing at the opening end is approximately three times the thickness of the thickest lower flange 21. Furthermore, as the inner edge 721 of the groove portion 72, which expands diagonally toward the front, approaches the upper and lower edges of the side plates 71, 71, the front edges of the side plates 71, 71 have a slightly acutely pointed side shape.

[0024] The connecting piece 73 extends horizontally from the upper edge of the rear portion of both side plates 71, 71, and integrally connects both side plates 71, 71. Near the rear end of the connecting piece 73, a through hole 74 is formed through which a suspension bolt 8 for supporting the ceiling substrate and interior substrate can be inserted.

[0025] The fastener 7, configured in this way, is fixed to the lower flange 21 of the beam member 2 from the indoor side of the beam under-insulation material 31 and beam transverse thermal material 32 that form the insulation line, through both insulation materials. At this time, the beam member 2 is not visible to the worker on the indoor side of the insulation line because it is obscured by the two insulation materials 31 and 32. However, by estimating the vicinity of the abutting point of the two insulation materials 31 and 32 and inserting the front part of the side plate 71, the opening end of the groove 72, which is greatly expanded in the height direction, catches the side edge of the lower flange 21, and is inserted so that the height of the groove 72 is aligned with the lower flange 21. At this time, even if the position in which the side plate 71 is inserted is slightly above or below the lower flange 21, since the front part of the side plate 71 is thin, the position of the lower flange 21 can be found by adjusting the angle of the side plate 71 in the vertical direction. Once the position of the side plate 71 is determined so that the groove 72 is aligned with the height of the lower flange 21, the rear end of the fixing device 7 is struck to engage the groove 72 with the lower flange 21.

[0026] In this way, the front portion of the fastener 7 is fixed to the beam 2 over both insulation materials 31 and 32, and the rear portion of the fastener 7 is kept exposed on the indoor side of both insulation materials 31 and 32. In other words, the length of the side plate 71 and the groove 72 is set so that when the side plate 71 of the fastener 7 is fixed to the beam 2, the connecting piece 73 is exposed on the indoor side of the insulation line. By inserting the suspension bolt 8 through the through hole 74 of the exposed connecting piece 73 and fastening it with a nut, the joist hanger 53 and the like that which constitute the ceiling base can be installed in the predetermined position. In place of the suspension bolt 8, or in addition to the suspension bolt 8, an appropriate support member (not shown) that supports the ceiling base or interior base can also be attached to this connecting piece 73.

[0027] Figures 4 to 6 show modified examples of the fastener 7. The part of the building in which this fastener 7 is used is the same as in Figure 1. With respect to the building and the fastener 7, components that have the same function or operation as those in the embodiments shown in Figures 1 to 3 are denoted by the same numerical reference numerals to simplify redundant explanations.

[0028] The fastener 7 shown in Figures 4 and 5 is formed with left and right side plates 71 that form a roughly rectangular shape, and these side plates 71 are integrally connected via connecting pieces 75 that extend to the rear end. In addition, connecting pieces 76, 76 that extend from the upper edges of each side plate 71, 71 are fixed so that they overlap each other on the upper surface, and female screw holes 77 are formed at two locations, front and rear of the overlapping area, by burring. The groove portion 72 formed in the side plate 71 differs slightly in shape from the embodiment described above, but the basic configuration is the same, such as the groove spacing in the vertical direction gradually decreasing from the front end to the rear, and the vicinity of the opening end of the groove portion 72 expanding diagonally toward the front.

[0029] With this configuration, since the rear-end connecting piece 75 is provided in the direction of extension of the groove 72, the fastener 7 can be easily and accurately fixed to the beam member 2 by striking the rear-end connecting piece 75 when engaging the groove 72 with the lower flange 21. Furthermore, since female screw holes 77 are formed in the connecting piece 76 that is superimposed on the upper side, the tightening of nuts can be reduced when attaching the suspension bolts 8 and other support members. By providing female screw holes 77 in multiple locations, it becomes easier to appropriately select the mounting position of the suspension bolts 8 and other support members according to the building part, further improving workability.

[0030] As explained above, according to the insulation structure for steel-framed buildings disclosed in this application, board-shaped insulation material is arranged so as to protrude into the interior side of the structural frame. Even if the beam material is not visible from the interior side due to the insulation material, fasteners for supporting ceiling and interior finishes can be easily attached to the lower flange of the beam material. Since the only part of the fastener that penetrates the insulation material is a thin plate-like side plate, the loss of the insulation line is minimized. Even if a film material with functions such as airtightness, moisture resistance, and fire resistance is attached to the interior side of the insulation material, the side plate of the fastener can be inserted through these film materials and fixed without any particular inconvenience. In Figures 1 and 6, the small-sized film material 35 attached to the insertion point of the fastener 7 is an acrylic-based airtight waterproof tape used for airtight sealing work on openings and joints. By attaching such a film material 35 to the insertion point of the fastener 7 in advance and then inserting the fastener 7 into it, the airtightness performance can be further improved.

[0031] Furthermore, the technical scope of the invention disclosed in this application should not be interpreted restrictively by the exemplary embodiments, but rather conceptually based on the claims. The names of the components used in the claims and specification are for convenience to facilitate concrete understanding of the invention, and the names do not unnecessarily limit the concept or properties of the components. When implementing the invention disclosed in this application, the detailed shape, dimensions, structure, material, quantity, combination form with other elements, relative positional relationship, etc., of components not specifically identified in the claims may be modified as appropriate, within the scope of using a substantially equivalent operating principle to that of the exemplary embodiment, or within the scope of obtaining substantially equivalent or better effects than those of the exemplary embodiment.

[0032] 1. Structural frame 2. Beam material 21. Lower flange 31. Beam underlayment 32. Beam transverse insulation 33. Fiber-based insulation 34. Film material 35. Film material 4. Exterior wall material 51. Interior wall base panel 52. Gypsum board 53. Joist hanger 54. Ceiling joist 6. Floor slab 7. Fasteners 71. Side plate 711. Lower edge 72. Groove 721. Inner edge 73. Connecting piece 74. Through hole 75. Connecting piece 76. Connecting piece 77. Female screw hole 8. Suspension bolt

Claims

1. In a steel-framed building insulation structure in which a structural plane of the building frame is formed by columns and beams on the outer perimeter, the beams are shaped steel members having a lower flange that protrudes toward the interior, a board-shaped beam-under-insulation material made of a foamed resin molded body is erected within the structural plane of the building frame, the interior side of the beams is covered with a board-shaped beam-transverse thermal material made of a foamed resin molded body, and the interior surface of the beam-under-insulation material and the interior surface of the beam-transverse thermal material are arranged to protrude further inward than the beams, A thermal insulation structure for a steel-framed building, comprising a pair of thin, plate-like side plates positioned opposite each other with a gap between them, and a connecting piece connecting the rear portions of the side plates in the left-right direction, wherein each side plate has a groove formed thereon that opens forward so as to engage with the lower flange, and the front portion of the side plate is inserted from the indoor side of the lower beam insulation material and the transverse beam insulation material near the abutting point of the two insulation materials, and the groove is engaged with the lower flange, thereby fixing the fastener to the beam material through the two insulation materials, while the rear portion of the fastener is kept exposed on the indoor side of the two insulation materials, and a support member for supporting ceiling substrate material or interior substrate material is attached to the rear portion of the fastener.

2. The thermal insulation structure for a steel-framed building as described in claim 1, characterized in that a film material is applied to the indoor side of the under-beam insulation material and the transverse-beam thermal material, and the fastener is fixed to the beam material through the film material.

3. The thermal insulation structure for a steel-framed building according to claim 1 or 2, characterized in that the side plates of the fastener are integrally connected to each other via a rear-end connecting piece provided in the direction of extension of the groove.

4. The thermal insulation structure for a steel-framed building according to claim 1 or 2, wherein the groove portion of the side plate is formed such that the groove spacing in the vertical direction gradually decreases from the front end to the rear, and the area near the opening end expands diagonally toward the front, and the inner edge of the diagonally expanded groove portion is shaped to approach the upper and lower edges of the side plate, respectively.

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