Insulated structure of steel-framed buildings

Abstract

To easily attach a fixture for supporting a ceiling substrate or the like to the indoor side of a beam material while minimizing damage to the insulation line in a heat insulation structure of a steel-framed building in which a board-like heat insulation material made of a foamed resin molded body is erected within the structural surface of a framework of the building frame to form an insulation line. [Solution] A fastener 7 is used, which comprises a pair of left and right side panels 71, 71 and a connecting piece 73 that connects their rear portions together in the left-right direction, with each side panel 71 having a groove 72 formed therein that can engage with the lower flange 21 of a beam 2. The side panel 71 is inserted from the indoor side of the under-beam insulation 31 and the cross-beam insulation 32 near the butt joint of both insulations 31, 32, and the groove 72 is engaged with the lower flange 21, thereby fixing the fastener 7 to the beam 2 over both insulations 31, 32. The rear portion of the fastener 7 is kept exposed indoors beyond both insulations 31, 32, and suspension bolts 8 and the like that support the ceiling substrate are attached thereto.

Description

[Technical Field]

[0001] The invention disclosed in this application relates to a thermal insulation structure for a steel-framed building. [Background technology]

[0002] A known thermal insulation structure is one in which an insulating interior wall base panel is erected within the structural plane of a framework surrounded by columns and beams at the periphery of a steel-framed building, or on the indoor side of the structural plane, to form an insulation line, and an interior wall finish material such as gypsum board or wallpaper is installed on the indoor side of the interior wall base panel. In such a thermal 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 such as polystyrene foam is stretched within the frame. The present applicant has also proposed and put into practical use such a thermal insulation structure in which an interior wall base panel is erected within the structural plane of a framework, for example, in Patent Document 1.

[0003] In such a thermally insulated structure, the interior wall base panels are fixed to the columns and beams that make up the framework via metal fasteners. The fasteners are typically comprised of a panel holder that holds the upper portion of the interior wall base panel frame and a beam fixing portion that is attached to the lower flange of an H-shaped steel beam. Patent Document 1 also discloses a fastener (referred to as a "fixing bracket" in the document) that has a main body that can be fitted onto the upper portion of the interior wall base panel from above and a beam fixing portion that can engage with the lower flange of the beam, bolted together. Similar fasteners that can engage with the lower flange of the beam are also used as ceiling-hanging brackets for suspending ceiling base materials (such as joist supports) installed on the indoor side of the framework (see, for example, Patent Document 2).

[0004] However, in the above-mentioned thermal insulation structure, even if the interior wall subfloor panels are erected slightly away from the framework, a thermal bridge is formed through the fasteners connecting the beams and the interior wall subfloor panels, which can become a weakness in the thermal insulation design. This is particularly a concern when lightweight steel with high thermal conductivity is used for the frame of the interior wall subfloor panels. The same applies to the ceiling suspension fittings used to suspend the ceiling subfloor materials. Furthermore, the gaps that form between the framework and the interior wall subfloor panels or ceiling subfloor around the installation points of the fasteners themselves are likely to cause breaks in the insulation line.

[0005] The present applicant has developed a practical insulation structure in which board-shaped insulation material made of a rigid foamed resin molded body, which has excellent self-supporting properties and is easy to achieve uniform thermal insulation performance, is installed directly within the structural surface of the framework of the building frame. This insulation structure, for example, is disclosed in Patent Document 3. In this insulation structure, dedicated fasteners are attached to the foundation and under the beams, respectively, and the lower and upper edges of the insulation material are fixed close to the foundation and beams, thereby reducing the exposed area of ​​the metal fasteners and preventing thermal bridges. Furthermore, the indoor-side surface of the insulation material installed directly under the beams (under-beam insulation material) is extended beyond the side edges of the beams toward the indoor side, and board-shaped insulation material (transverse beam insulation material) is also fitted into the recesses on the indoor side of the beams (the pockets of the H-shaped steel beams). This aligns the indoor-side surfaces of the transverse beam insulation material and the indoor-side surfaces of the under-beam insulation material, thereby forming a seamless insulation line between the framework of the building frame and the interior wall and ceiling substrates. By covering the interior side of the insulation line with a resin film material, it is possible to further improve the building's airtightness, moisture resistance, fire resistance, etc. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-266417 [Patent Document 2] Publication number 05-023688 [Patent Document 3] Japanese Patent Publication No. 2023-108965 Summary of the Invention [Problem to be solved by the invention]

[0007] In the thermal insulation structure disclosed in Patent Document 3, the under-beam insulation material installed directly under the beams and the cross-beam insulation material covering the recessed side surfaces on the indoor side of the beams are arranged so that their indoor-side surfaces extend beyond the side edges of the beams. As a result, the beams are hidden by these insulation materials, making it difficult to attach fixtures such as the ceiling-hanging brackets disclosed in Patent Document 2 to the bottom flanges of the beams.

[0008] The invention disclosed in this application was conceived to improve such inconveniences, and aims to propose an insulation structure in which insulation lines are formed by erecting board-shaped insulation material made of foamed resin molded bodies within the structural surfaces of the frame of a steel-framed building, and which allows for easy attachment of fixings to support ceiling and interior substructures on the indoor side of the beams while minimizing damage to the insulation lines. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the invention disclosed in this application provides an insulating structure for a steel-framed building in which the structural surface of a framework is formed by columns and beams at the outer periphery, the beams are shaped steel members with bottom flanges that protrude toward the indoor side, board-shaped under-beam insulation material made of foamed resin is installed within the structural surface of the framework, and the indoor side of the beams is covered with board-shaped transverse beam insulation material made of foamed resin, and the indoor side surfaces of the under-beam insulation material and the indoor side surfaces of the transverse beam insulation material are arranged so as to protrude toward the indoor side beyond the beams, the insulating structure comprising a pair of thin plate-shaped side panels placed opposite each other at an appropriate interval, The fixing device is provided with a connecting piece that connects the rear portions of both side panels together in the left-right direction, and each side panel has a groove formed in it that opens forward and can engage with the lower flange.The front portion of the side panel is inserted from the indoor side of the under-beam insulation and the cross-beam insulation near the butt point of the two insulation materials, and by engaging the groove with the lower flange, it is fixed to the beam material through the two insulation materials, while the rear portion of the fixing device is kept exposed indoors beyond the two insulation materials, and a support member that supports the ceiling underlayment or interior underlayment is attached to the rear portion of the fixing device.

[0010] Furthermore, the invention disclosed in this application adopts a configuration in which, in the insulation structure of the above-mentioned steel-framed building, a film material is laid on the indoor side of the under-beam insulation material and the cross-beam insulation material, and the fixing device is fixed to the beam material through the film material.

[0011] Furthermore, the invention disclosed in the present application employs a configuration in which the side plates of the fixing device are integrally connected to each other via a connecting piece on the rear end side that is provided in the extension direction of the groove portion.

[0012] Furthermore, the invention disclosed in this application adopts a configuration in which, in the insulation structure of the above-mentioned steel-framed building, the groove portions of the side panels are formed so that the groove spacing in the vertical direction gradually decreases from the front end toward the rear, and the vicinity of the opening end expands diagonally toward the front, and the inner edges of the diagonally expanding groove portions are shaped to approach the upper and lower edges of the side panels, respectively. [Effects of the Invention]

[0013] In the thermal insulation structure of a steel-framed building constructed as described above, the board-shaped insulation material is arranged so that it protrudes from the interior side of the framework. Even if the insulation material obscures the beams from the interior side, fasteners for supporting the ceiling and interior subfloors can be easily attached to the bottom flanges of the beams. Since the only part of the fastener that penetrates the insulation material is the thin side panel, damage to the insulation line is minimized. Even if a film material with airtight, moisture-proof, or fire-resistant properties is installed on the interior side of the insulation material, the side panel of the fastener can be inserted and secured through the film material without any problems. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a vertical cross-sectional view showing one embodiment of a heat insulating structure for a steel-framed building according to the invention disclosed in the present application. [Figure 2] FIG. 2 is a perspective view of a fixture used in the thermal insulation structure of FIG. 1. [Figure 3] 3A is a front view of the tip end side of the fixture of FIG. 2, FIG. 3B is a plan view, and FIG. 3C is a side view. [Figure 4] FIG. 10 is a perspective view showing a modified example of the fixing device. [Figure 5] 5A is a front view of the tip end side of the fixture of FIG. 4, (b) is a plan view, and (c) is a side view. [Figure 6] FIG. 5 is a vertical cross-sectional view of a heat insulating structure using the fixture of FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows one embodiment of a heat insulation structure for a steel-framed building according to the present invention, and Figs. 2 and 3 show specific configurations of fasteners used in the heat insulation structure of Fig. 1.

[0016] This thermal insulation structure involves erecting board-shaped insulation material (hereinafter referred to as "beam-under-insulation material 31") on the structural surface of the framework 1, surrounded by the outer periphery columns (not shown) and beams 2, toward the indoor side, and also installing board-shaped insulation material (hereinafter referred to as "beam-crossing insulation material 32") on the indoor-facing sides of the beams 2, forming an insulation line on the indoor side of the framework 1. While H-shaped steel beams are typically used for the beams 2, channel steel beams or laminated steel beams formed by joining the webs of two channel steel beams can also be used as long as they have at least one bottom flange 21 that extends horizontally toward the indoor side. An exterior wall material 4 is attached to the outdoor side of the framework 1 via appropriate attachment means (not shown). An in-wall ventilation layer may be formed between the exterior wall material 4 and the framework 1. On the indoor side of the framework 1, an interior wall base panel 51 and gypsum board 52 that constitute the interior wall base, and a ceiling joist support 53 and ceiling joist 54 that constitute the ceiling base are assembled.

[0017] The "board-shaped insulation" in this thermal insulation structure refers to a flat, molded body several centimeters to several tens of centimeters thick made of a hard, expandable resin (such as polystyrene foam, polyethylene foam, urethane foam, or phenolic foam). The under-beam insulation 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 substructure, such as an ALC slab, to the bottom of the beam 2) and is fixed via appropriate insulation mounting members to prevent it from tipping over indoors or outdoors. The "height that matches the under-beam dimension" here refers to a height at which the upper edge of the under-beam insulation 31 abuts or is comfortably held close to the underside of the beam 2. The height should be the same as the under-beam dimension or a few millimeters smaller. The under-beam insulation 31 is positioned so that its indoor surface extends slightly indoors beyond the side edge of the lower flange 21 of the beam 2, and is installed adjacent to the beam 2 along the length of the beam 2 without any gaps.

[0018] In the illustrated embodiment, the beam crossing thermal insulation material 32 is placed on the indoor side of the beam 2 so as to close the side recess (the pocket portion of the H-shaped steel) after filling the indoor side recess of the beam 2 with fiber-based thermal insulation material 33. The beam crossing 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 under-beam thermal insulation material 31, which protrudes indoors beyond the side edge of the bottom flange 21. The abutting points between the beam crossing thermal insulation material 32 and the under-beam thermal insulation material 31 may be fixed by sealing with adhesive tape, for example. Note that in the illustrated embodiment, the beam crossing thermal insulation material 32 protrudes slightly indoors more than the under-beam thermal insulation material 31, but the indoor surfaces of both thermal insulation materials 31, 33 may be flush. Alternatively, instead of filling the side recess of the beam material 2 with fiber-based insulation material 33, a thick board-shaped beam cross-section insulation material may be fitted into almost the entire side recess, or multiple board-shaped insulation materials may be stacked and fitted into the recess.

[0019] In this way, a seamless insulation line is formed on the indoor side of the framework 1 of the outer periphery of a steel-framed building, connecting the under-beam insulation material 31 and the cross-beam insulation material 32. By slightly extending the indoor-side surfaces of the under-beam insulation material 31 and the cross-beam insulation material 32 beyond the side edges of the bottom flanges 21 of the beams 2, the bottom flanges 21 of the beams 2 can be prevented from protruding indoors beyond the insulation line and forming a thermal bridge. An appropriate film material 34 having airtight, moisture-proof, fire-resistant, or other properties may be attached to the indoor side of this insulation line. In the illustrated embodiment, the upper part of the film material 34 is attached so as to wrap around from the upper edge of the cross-beam insulation material 32 to its backside. The ceiling and interior wall substrates surrounding the indoor space are then installed away from the insulation line.

[0020] The main feature of the invention disclosed in this application is a structure in which a fastener 7 for supporting a ceiling substrate or an interior substrate is attached from the indoor side to the bottom flange 21 of the beam 2 that is covered by such a thermal insulation line. An embodiment of the fastener 7 is shown in Figures 2 and 3. Note that, when explaining the positional relationship of each part of the fastener 7 and the direction of operation below, the viewpoint from which a worker on the indoor side of the framework 1 attaches the fastener 7 toward the beam 2 (the viewpoint facing left in Figure 1) will be used as the reference point, and the outdoor side will be referred to as the front (front side), the indoor side as the rear (rear side), and the direction parallel to the length of the beam 2 (the direction perpendicular to the surface in Figure 1) as the left-right direction (width direction).

[0021] The fixing device 7 is a member comprising a pair of side plates 71, 71 arranged opposite each other in the left-right direction at an appropriate distance, 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 to a generally rectangular shape in side view. A groove 72 that can engage with the lower flange 21 of the beam 2 is formed in the front portion of each side plate 71 so as to open forward.

[0023] As shown in Fig. 3, the groove portions 72 are formed so that the groove spacing in the up-down direction decreases in stages from the front end toward the rear. The groove spacing corresponds to the thickness of multiple types (three types in the illustrated embodiment) of the bottom flange 21 of the beam material 2. The groove portions 72 near the open ends thereof expand obliquely toward the front to easily accommodate the bottom flange 21 of the beam material 2, and the groove spacing at the open ends is approximately three times the thickness of the thickest bottom flange 21. In addition, the inner edges 721 of the groove portions 72 that expand obliquely toward the front approach the upper and lower edges of the side plates 71, 71, so that the front edges of the side plates 71, 71 form side shapes that are slightly pointed at an acute angle.

[0024] The connecting piece 73 extends horizontally from the upper edges of the rear portions 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 or interior substrate can be inserted.

[0025] The fixture 7 configured in this manner is fixed to the bottom flange 21 of the beam 2 from the indoor side of the under-beam insulation 31 and the cross-beam insulation 32 that form the insulation line, over these insulation materials. At this time, the beam 2 is obscured by the insulation materials 31, 32 to a worker on the indoor side of the insulation line, but when the worker locates the area near the butt point of the insulation materials 31, 32 and inserts the front portion of the side plate 71, the open end of the groove 72, which is greatly expanded in the vertical direction, catches the side edge of the bottom flange 21, and the side plate 71 is inserted so that the height of the groove 72 is aligned with the bottom flange 21. At this time, even if the insertion position of the side plate 71 is slightly shifted above or below the bottom flange 21, the front portion of the side plate 71 is thin, so the position of the bottom 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 has been determined so that the groove 72 is flush with the height of the lower flange 21 , the rear end of the fixture 7 is tapped to engage the groove 72 with the lower flange 21 .

[0026] In this way, the front portion of the fixing device 7 is fixed to the beam 2 through both insulation materials 31, 32, and the rear portion of the fixing device 7 is maintained in a state where it is exposed on the indoor side of both insulation materials 31, 32. In other words, the lengths of the side plate 71 and the groove portion 72 are set so that the connecting piece 73 is exposed on the indoor side of the insulation line when the side plate 71 of the fixing device 7 is fixed to the beam 2. By inserting the hanging bolt 8 into the through hole 74 of the exposed connecting piece 73 and fastening the nut, the joist support 53 and other components that make up the ceiling underlayment can be installed in the specified position. Instead of or in addition to the hanging bolt 8, an appropriate support member (not shown) for supporting the ceiling underlayment or interior underlayment can be attached to the connecting piece 73.

[0027] 4 to 6 show modified examples of the fixing device 7. The part of the building in which this fixing device 7 is used is the same as that shown in FIG. 1. Concerning the building and fixing device 7, components that share functions or actions with the embodiment shown in FIGS. 1 to 3 are given the same numeral symbols to simplify redundant explanations.

[0028] The fixture 7 shown in Figures 4 and 5 has left and right side plates 71 formed in a generally rectangular shape, and these side plates 71 are integrally connected via connecting pieces 75 extending toward the rear end. Connecting pieces 76, 76 extending from the upper edges of each side plate 71, 71, are fixed to each other so as to overlap on the upper surface, and female screw holes 77 are formed by burring at two locations, front and rear, of the overlapping portion. The grooves 72 formed in the side plates 71 have slightly different shapes from those of the previously described embodiment, but the basic configuration is the same, such as the vertical groove spacing gradually decreasing from the front end toward the rear and the portion near the open end of the groove 72 expanding obliquely toward the front.

[0029] With this configuration, the rear end connecting piece 75 is provided in the extension direction of the groove 72, so that by hammering the rear end connecting piece 75 when engaging the groove 72 with the lower flange 21, the fastener 7 can be easily and accurately fixed to the beam 2. Furthermore, because female threaded holes 77 are formed in the connecting piece 76 stacked on the upper surface side, the labor required for fastening nuts can be reduced when attaching the suspension bolts 8 and other support members. By providing female threaded holes 77 in multiple locations, it becomes easier to appropriately select the attachment positions for the suspension bolts 8 and other support members depending on the part of the building, further improving workability.

[0030] As described above, the insulation structure for steel-framed buildings disclosed herein allows fasteners for supporting ceiling and interior subfloors to be easily attached to the bottom flanges of beams even when board-shaped insulation material is positioned to extend beyond the interior side of the framework and obscures the beams from the indoor side. Because the only part of the fastener that penetrates the insulation material is the thin side panel, damage to the insulation line is minimized. Even if airtight, moisture-proof, fire-resistant, or other film material is attached to the indoor side of the insulation material, the side panel of the fastener can be inserted and secured through the film material without any problems. In Figures 1 and 6, the small film material 35 attached over the insertion point of the fastener 7 is an acrylic airtight waterproof tape used for airtight construction of openings and joints. By attaching such film material 35 to the insertion point of the fastener 7 in advance and then inserting the fastener 7, airtightness can be further improved.

[0031] The technical scope of the invention disclosed herein should not be construed as being limited by the exemplified embodiments, but should be construed conceptually based on the claims. The names of elements used in the claims and specification are for convenience in making the invention easier to understand specifically, and the names do not unnecessarily limit the concepts or properties of the elements. When implementing the invention disclosed herein, the detailed shape, dimensions, structure, material, quantity, combination with other elements, relative positional relationship, etc. of elements not specifically specified in the claims may be appropriately modified within the scope of utilizing an operating principle substantially equivalent to the exemplified embodiments or within the scope of obtaining effects substantially equivalent to or greater than those of the exemplified embodiments. [Explanation of symbols]

[0032] 1 Frame frame 2 Beam material 21 Lower flange 31 Under-beam insulation 32 Beam cross-section heat exchanger 33 Fiber-based insulation materials 34 Film material 35 Film material 4 Exterior wall materials 51 Interior wall base panel 52 Gypsum board 53 Noenuke 54 Ceiling veranda 6 Floor slab 7 Fixtures 71 Side panel 711 Lower margin 72 Groove 721 Common-law marriage 73 Connecting piece 74 Through hole 75 Connecting piece 76 Connecting piece 77 female screw hole 8 Hanging bolt

Claims

1. The outer perimeter columns and beams form the structural surface of the framework. The beam material is a shaped steel material having a bottom flange that protrudes toward the indoor side, A board-shaped under-beam insulation material made of a foamed resin molded body is erected within the structural surface of the framework of the frame, The indoor side of the beam is covered with a board-shaped beam crossing thermal material made of a foamed resin molded body, In a heat insulation structure of a steel-framed building, the indoor surface of the under-beam insulation material and the indoor surface of the cross-beam insulation material are arranged so that they protrude indoors beyond the beam material, The fixture comprises a pair of thin, opposing side panels at an appropriate interval, and connecting pieces that connect the rear portions of the side panels together in the left-right direction, and each side panel has a groove formed in it that can engage with the lower flange so that it opens forward.The fixture is inserted into the front portions of the side panels from the indoor side of the beam under-insulation material and the beam crossing insulation material near the butt joint of the two insulation materials, and the groove is engaged with the lower flange, thereby fixing the fixture to the beam material through the two insulation materials, The rear portion of the fixture is held in a state where it is exposed indoors beyond both of the thermal insulation materials, A support member for supporting a ceiling substrate or an interior substrate is attached to the rear portion of the fixture. A heat-insulating structure for a steel-framed building.

2. In the heat insulating structure of a steel frame building according to claim 1, A film material is laminated on the indoor side of the under-beam insulation material and the cross-beam insulation material, The fixture is fixed to the beam material through the film material. A heat-insulating structure for a steel-framed building.

3. In the heat insulating structure of a steel frame building according to claim 1 or 2, The side plates of the fixture are integrally connected to each other via a connecting piece on the rear end side that is provided in the extension direction of the groove portion. A heat-insulating structure for a steel-framed building.

4. In the heat insulating structure of a steel frame building according to claim 1 or 2, The grooves of the side plates are formed so that the vertical groove spacing gradually decreases from the front end toward the rear, and the vicinity of the opening end expands obliquely toward the front, with the inner edges of the obliquely expanded grooves approaching the upper and lower edges of the side plates, respectively. A heat-insulating structure for a steel-framed building.

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