Suspended courtyard structure

Abstract

To provide a suspended ceiling structure that makes it possible to firmly fix, to a skeleton, a suspension beam supporting a ceiling in a suspended state in a building of a frame construction method, thereby preventing transmission of vibrations and sound between upper and lower floors and improving fire proofing properties of an attic.SOLUTION: A fire proofing surface material 6 is attached to an interior side of a skeleton in a building 1, a suspended ceiling 10 comprises: a ceiling body 11; a plurality of ceiling hangers 12 having the ceiling body 11 attached to lower ends and supporting the ceiling body 11 from above; a wooden hanging beam 13 having an upper end of the ceiling hangers 12 attached thereto; and a receiving metal fitting 14 receiving an end of the hanging beam 13 and connected to the hanging beam 13, wherein the fire proofing surface material 6 extends from a position lower than the ceiling body 11 to a position higher than a height of the receiving metal fitting 14, and the receiving metal fitting 14 is fixed with a fixing material to a part of the skeleton to which the fire proofing surface material 6 is attached, via the fire proofing surface material 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a suspended ceiling structure. [Background technology]

[0002] A conventional suspended ceiling structure, such as that described in Patent Document 1, is known as a ceiling structure designed to prevent the transmission of vibrations and sound between upper and lower floors. This type of suspended ceiling structure is configured such that the ends of hanging beam holders are supported by metal brackets fixed to the sides of the beams, hanging beams are fixed to the hanging beam holders, a frame consisting of joist supports and joists is attached to the lower ends of the hanging beams, and ceiling material is attached to the underside of the joists. The hanging beam holders are positioned with a gap between them and the joists that support the floor of the upper floor, which helps prevent the transmission of vibrations and sound between upper and lower floors.

[0003] Furthermore, Patent Document 2 discloses a ceiling structure in a building constructed using wood panel construction, in which gypsum board, which is installed on the surface of the wall as an interior wall surface material, extends above the height of the steel suspension beams that support the ceiling. Since gypsum board functions as a fire-resistant surface material, extending it above the height of the steel suspension beams can improve fire resistance in the attic. Note that the support metal fittings that support the steel suspension beams are fixed to the wall made of wood panels using reinforcing plywood installed on the surface of the gypsum board as part of the fixing base. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 08-082035 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-054545 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, there is a demand for adopting a suspended ceiling structure in buildings constructed using the post-and-beam method, suppressing the transmission of vibrations and sound between upper and lower floors, while extending fire-resistant surface materials made of gypsum board or the like into the attic to improve the fire resistance of the attic. However, unlike buildings constructed using wood panel construction, buildings constructed using the post-and-beam method have large gaps between vertical members such as columns and horizontal members such as beams, and plywood is not attached to the surface of the framework. Therefore, in buildings constructed using the post-and-beam method, it is not always possible to ensure a fixing base with sufficient strength to secure the support metal that supports the hanging beam with fixing materials. Even if reinforced plywood is attached to the surface of the gypsum board and used as a fixing base, if there is only space behind the gypsum board (if there is no material to serve as a fixing base), it is difficult to ensure sufficient fixing strength to secure the support metal with fixing materials.

[0006] The present invention was made in consideration of the above circumstances, and its objective is to enable the suspension beams that support the ceiling in a suspended state to be firmly fixed to the main body in a building constructed using a post-and-beam construction method, thereby improving the fire resistance of the attic while suppressing the transmission of vibrations and sound between upper and lower floors. [Means for solving the problem]

[0007] The invention described in claim 1 is a structure of a suspended ceiling 10 arranged at a distance below a superstructure in a building 1 constructed by a framework construction method, as shown in, for example, Figs. 1 to 6, A fire-resistant surface material 6 is attached to the indoor side of the skeleton of the building 1, The body is A horizontal member 4 to which the fire-resistant surface material 6 is attached; The fire-resistant surface material 6 is attached, and a hanging beam 7 is provided in a state of being hung from the underside of the cross member 4, The suspended ceiling 10 is The ceiling body 11 and a plurality of hanging bars 12 to which the ceiling body 11 is attached at the lower end and which suspend and support the ceiling body 11 from above; A wooden suspension beam 13 to which the upper ends of the plurality of suspension beams 12 are attached; and a receiving hardware 14 that receives the end of the suspension beam 13 and is connected to the suspension beam 13, The fireproof surface material 6 extends from a position below the ceiling body 11 to a position above the height position of the receiving metal fitting 14, and the receiving metal fitting 14 is attached to a part of the frame to which the fireproof surface material 6 is attached via the fireproof surface material 6. The side of the hanging bundle 7 It is characterized in that it is fixed to the surface with a fixing material.

[0008] According to the invention described in claim 1, the fireproof surface material 6 extends from a position below the ceiling body 11 to a position above the height position of the receiving metal fitting 14, and the receiving metal fitting 14 is connected to a part of the frame to which the fireproof surface material 6 is attached via the fireproof surface material 6. (Hanging bunch 7 Aspects of ) with fixing materials, the fire-resistant surface material 6 can separate the frame and the suspension beams 13, and can provide fire-resistant covering up to a position above the suspension beams 13 in the attic. Furthermore, the ends of the suspension beams 13 can be supported by receiving metal fittings 14 fixed to a part of the frame with fixing materials, and the suspension beams 13 can be connected. Therefore, in a building 1 constructed using a framework construction method, the suspension beams 13 that support the ceiling body 11 in a suspended state can be firmly fixed to the frame, which can improve the fire resistance of the attic while suppressing the transmission of vibrations and sound between upper and lower floors. Furthermore, the framework of building 1, which is constructed using the post-and-beam method, includes cross members 4 and hanging beams 7 suspended from the undersides of cross members 4, and receiving hardware 14 is fixed to the sides of hanging beams 7 with fixing materials, so even if there is no fixing base on the back side of fire-resistant face material 6 at the location where hanging beam 13 is to be installed, a fixing base for the fixing materials can be secured by hanging beams 7. Therefore, in building 1 constructed using the post-and-beam method, hanging beams 13 that support ceiling body 11 in a suspended state can be firmly fixed to the framework.

[0009] The invention described in claim 2 is, for example, as shown in Figures 1 and 2, in the suspended ceiling structure described in claim 1, The body is The horizontal members 4 are parallel to each other, The suspension bundle 7 is provided on the underside of one of the cross members 4, and the suspension bundle 7 is provided on the underside of the other cross member 4, The receiving metal fittings 14 are provided on the side of the hanging bundle 7 provided on one of the horizontal members 4 and on the side of the hanging bundle 7 provided on the other horizontal member 4, and are fixed by the fixing members, The suspension beam 13 is in a state of being spanned between one of the horizontal members 4 and the other horizontal member 4. It is characterized by:

[0011] The invention described in claim 3 is , request In the suspended ceiling structure according to claim 1, The superstructure is an upper floor 3 including at least a plurality of beams 3a, 3b, a plurality of floor joists 3c, and a floor surface material 3d, The plurality of beams 3a, 3b includes a plurality of main beams 3a, The cross member 4 and the plurality of girders 3a are arranged in parallel, The receiving hardware 14 is provided on the side of the hanging beam 7 provided on the cross member 4 and on the side of the girder 3a, and is fixed by the fixing material. The suspension beam 13 is bridged between the cross member 4 and the main beam 3a. It is characterized by:

[0013] The invention described in claim 4 is, for example, as shown in Figs. 2 As shown in the above, in the suspended ceiling structure according to claim 1, The receiving metal fitting 14 is disposed across the side of the horizontal member 4 and the side of the hanging bundle 7 in a part of the body, and The fixing member is fixed to the surface of the substrate.

[0015] The invention described in claim 5 is, for example, as shown in Figs. 2 to 5, in the suspended ceiling structure described in claim 1, The receiving hardware 14 is a fixing plate portion 15 fixed to a part of the frame by the fixing material via the fire-resistant surface material 6; one and the other side plate portions 16 protruding from both side edge portions of the fixing plate portion 15, The end of the suspension beam 13 is characterized in that it is disposed between the one and the other side plate portions 16 and fixed to these side plate portions 16.

[0016] According to the invention described in claim 5, the fixing plate portion 15 is fixed to a part of the frame with a fixing material via the fire-resistant surface material 6, and the end portion of the suspension beam 13 is disposed between one and the other side plate portions 16 protruding from both side edges of the fixing plate portion 15, thereby making it possible to position the suspension beam 13 in the lateral direction. This makes it easier to install the suspension beam 13 in an accurate position.

[0017] The invention described in claim 6 can be realized by the following method, as shown in Figs. 2 In the suspended ceiling structure described in The superstructure is a floor of the upper floor 3 including at least a plurality of beams 3a, 3b, a plurality of floor joists 3c, and a floor surface material 3d, The plurality of beams 3a, 3b includes a plurality of main beams 3a, The suspension beam 13 is characterized in that it is arranged horizontally in parallel with the plurality of girders 3a.

[0018] According to the invention recited in claim 6, the suspension beams 13 are arranged horizontally in parallel with the multiple girders 3a that make up the floor of the upper floor 3, and therefore it is possible to prevent the suspension beams 13 and the girders 3a from interfering with each other due to being arranged perpendicular to each other. This eliminates the need to arrange the upper surface of the suspension beams 13 lower than the lower surface of the girders 3a, and it is possible to prevent the height position of the ceiling main body 11 supported by the suspension beams 13 from becoming lower. Therefore, for example, the ceiling height of the room on the lower floor 2 located below the ceiling main body 11 can be made higher compared to when the suspension beams 13 are arranged lower than the lower surfaces of the multiple girders 3a.

[0019] The invention described in claim 7 is, for example, as shown in Fig. 1 and Fig. 6, in the suspended ceiling structure described in any one of claims 1 to 6, A sound-insulating material 17 is laid on the upper surface of the ceiling body 11, The sound-proofing material 17 is characterized in that it is arranged so as to pass between the upper surface of the ceiling main body 11 and the lower surface of the suspension beam 13.

[0020] According to the invention described in claim 7, the sound-insulating material 17 is arranged so as to pass between the upper surface of the ceiling body 11 and the lower surface of the suspension beam 13, and therefore a high sound-insulating effect can be achieved compared to, for example, a case in which the sound-insulating material 17 crosses over the top of the suspension beam 13 or is interrupted midway. [Effects of the Invention]

[0021] According to the present invention, in a building constructed using a post and beam construction method, the suspension beams that support the ceiling in a suspended state can be firmly fixed to the main body, thereby suppressing the transmission of vibrations and sound between upper and lower floors while improving the fire resistance of the attic. [Brief explanation of the drawings]

[0022] [Figure 1] This shows a building that uses a suspended ceiling structure, where (a) is a cross-sectional view taken along line AA, and (b) is a cross-sectional view taken along line BB. [Figure 2]This shows a suspended ceiling structure when suspension beams are used as a fixed base, where (a) is a side cross-sectional view and (b) is a front view of the area around the support metal fittings. [Figure 3] This is a diagram showing a suspended ceiling structure when pillars are used as a fixed base. [Figure 4] This is a diagram showing a suspended ceiling structure when beams are used as a fixed base. [Figure 5] A diagram showing the configuration of a receiving metal fitting. [Figure 6] The following shows examples of soundproofing material installation, with (a) being an OK example and (b) and (c) being NG examples. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0024] In Fig. 1, reference numeral 1 denotes a building. This building 1 is a building constructed by a wooden framework construction method, and in this embodiment is a multi-story house. The skeleton of the building 1 is made up of a plurality of framework members, and these framework members include vertical members such as columns and horizontal members (cross members) such as beams. In this embodiment, the building 1 is made of wood, but is not limited to this and may be made of steel (heavy steel frame, light steel frame).

[0025] More specifically, as shown in Figures 1 to 4, the building 1 has a lower floor 2 and an upper floor 3. The walls of the lower floor 2 are erected on the floor of the lower floor 2, the floor of the upper floor 3 is erected on the walls of the lower floor 2, and the walls of the upper floor 3 are erected on the floor of the upper floor 3. Furthermore, a ceiling 10 of the lower floor 2 (i.e., a suspended ceiling 10) is provided between the lower floor 2 and the upper floor 3, and the floor of the upper floor 3 is provided as a structure above the ceiling 10. In this embodiment, the lower floor 2 and the upper floor 3 may be upper and lower floors of the same dwelling unit, or may be separate dwelling units.

[0026] In this embodiment, the lower floor 2 is the first floor. Therefore, the floor of the lower floor 2 is configured with a base 2a provided on the foundation, joists 2b spanning between the bases 2a, joists (not shown), a lower floor floor surface material 2d, etc.

[0027] Lower floor columns 2e are erected on the foundation 2a and joists 2b, and the lower floor floor surface materials 2d are arranged to avoid the lower floor columns 2e. Between the upper ends of the multiple lower floor columns 2e erected on the periphery of the lower floor 2, girder spans 4 (or beams 5, described later) are installed.

[0028] A fire-resistant surface material 6 is attached to the interior side of the lower floor column 2e, from the lower floor floor surface material 2d up to the girth 4, to form the interior wall surface of the lower floor 2. The fire-resistant surface material 6 extends above the height of the receiving metal fittings 14, which will be described later. Note that as this fire-resistant surface material 6, gypsum board (reinforced gypsum board may be used) that has fire resistance, heat insulation, sound insulation, etc. is used. The exterior side of the lower floor column 2e is provided with a breathable waterproof sheet, furring strips 9, and exterior materials to form the exterior wall surface of the upper floor 3.

[0029] In this embodiment, the upper floor 3 is the second floor. The floor of the upper floor 3 is configured with a plurality of girders 3a that are installed between the girder spans 4, small beams 3b that are installed between the girders 3a at necessary locations, a plurality of floor joists 3c, and upper floor floor surface materials 3d. Since the main beam 3a requires more structural strength than the sub-beams 3b and floor joists 3c, it is set to have a larger beam depth than these sub-beams 3b and floor joists 3c. Upper floor floor surface materials 3d are provided on the top surfaces of the main beam 3a, the sub-beams 3b, and the floor joists 3c, so they are set at the same height. Therefore, the lower end of the main beam 3a protrudes downward more than the lower ends of the sub-beams 3b and floor joists 3c.

[0030] Upper floor columns 3e are erected on the main beams 3a and minor beams 3b, and the upper floor floor surface materials 3d are positioned to avoid the upper floor columns 3e. In addition, braces 3f are installed between the multiple upper floor columns 3e erected in necessary locations for reinforcement. Minor beams 3b are installed under the floor at the locations where the braces 3f are installed. Therefore, these locations are stronger than other locations and function as load-bearing walls.

[0031] As with the lower floor 2, fire-resistant surface materials are appropriately attached to the indoor sides of the upper floor columns 3e to form the interior wall surfaces of the upper floor 3. As with the lower floor 2, the exterior side is also provided with breathable waterproof sheets, girts 9, and exterior materials to form the exterior wall surface of the upper floor 3.

[0032] It should be noted that in both the lower floor 2 and the upper floor 3, the hollow spaces in the walls and floors are filled with insulating material as appropriate. In particular, if the insulating material filled in the floor of the upper floor 3 is a fire-resistant insulating material, it is preferable in terms of improving the fire resistance of the space above the suspended ceiling 10. If the upper end of the fire-resistant face material 6 attached to the indoor side of the frame is in contact with the fire-resistant insulating material filled in the hollow space in the floor of the upper floor 3, the fire-resistant structure will be continuous, which is preferable in terms of improving the fire resistance of the space above the suspended ceiling 10.

[0033] Furthermore, in both the case of the lower floor 2 and the upper floor 3, a wall finishing material such as wall paper is provided on the surface of the fire-resistant surface material 6, and a floor finishing material is also provided on the floor surface. It is preferable that each of these finishing materials also has fire resistance properties.

[0034] The suspended ceiling 10 installed in the building 1 configured as described above comprises a ceiling body 11, a plurality of hanging poles 12 to the lower ends of which the ceiling body 11 is attached and which support the ceiling body 11 from above, wooden hanging beams 13 to which the upper ends of the plurality of hanging poles 12 are attached, and support metal fittings 14 which receive the ends of the hanging beams 13 and are connected to the hanging beams 13. In addition, sound insulation material 17 is laid on the upper surface of the ceiling body 11 to suppress the transmission of sound between upper and lower floors.

[0035] The ceiling body 11 comprises a ceiling surface material 11a facing the lower floor 2, a siding 11b formed by assembling a plurality of siding materials in a lattice pattern and having the ceiling surface material 11a attached to its underside, and a plurality of siding supports 11c attached to the upper surface of the siding 11b and having the lower ends of a plurality of hanging beams 12 attached thereto. Here, the space above the suspended ceiling 10 (also called the ceiling cavity) refers to the space formed above the ceiling surface material 11a of the ceiling main body 11 and below the floor of the upper floor 3 (in this embodiment, this refers to the upper floor floor surface material 3d, but it may also refer to the joists 3b and joists 3c). Furthermore, a ceiling finishing material such as ceiling cloth is provided on the underside of the ceiling surface material 11a. It is preferable that such a ceiling finishing material has fire resistance.

[0036] The rafters are square timbers, and a lattice-shaped rafter 11b made up of a plurality of rafters is provided around the four walls (fire-resistant surface material 6) of the room on the lower floor 2. Furthermore, ceiling surface material 11a attached to the underside of rafter 11b is also provided around the four walls of the room on the lower floor 2, just like rafter 11b. In other words, the ceiling main body 11, and therefore the suspended ceiling 10 itself, is provided around the four walls of the room on the lower floor 2. The furring strip support 11c is also a square piece of timber and is attached along the top surface of the furring strip or is attached by bridging multiple furring strips.

[0037] The multiple hanging beams 12 are square timbers, and their lower ends are attached to the sides of multiple joist supports 11c. In places where there are no joist supports 11c, they may be attached to joists 11b. In addition, the upper ends of the hanging beams 12 are attached to the sides of the hanging beams 13. The hanging beam 12 is attached to the siding support 11c (siding 11b) and the hanging beam 13 by means of fasteners such as nails or screws, and an adhesive may also be used in this case.

[0038] The suspension beams 13 are made by gluing two pieces of wood (wooden boards) together to form a single beam, and multiple suspension beams 13 are arranged within the ceiling space above the suspended ceiling 10. Furthermore, only the longitudinal side ends of the multiple suspension beams 13 are in contact with the frame. Such suspension beams 13 are arranged horizontally in parallel with the multiple girders 3a above the suspended ceiling 10. In other words, the suspension beams 13 and the girders 3a are arranged so as not to intersect with each other. This prevents the suspension beams 13 from interfering with the girders 3a that protrude below the minor beams 3b and floor joists 3c, allowing the ceiling height of the rooms on the lower floor 2 to be increased.

[0039] As shown in FIG. 5, the receiving metal member 14 includes a fixed plate portion 15 and one and the other side plate portions 16, and is formed to have a substantially U-shaped cross section. The fixing plate portion 15 is a plate-shaped portion that is fixed to a part of the frame via the fire-resistant facing material 6 with a fixing material. In this embodiment, screws are used as the fixing material. The fixing plate portion 15 has a plurality of screw holes 15a (through holes through which the fixing material is passed). The plurality of screw holes 15a includes those at the four corners of the fixing plate portion 15 and those at positions closer to the center than the screw holes 15a at the four corners. The plurality of screw holes 15a formed at the center are positioned so that the screws can be passed as close as possible to the connecting metal 8, which will be described later, while preventing contact between the screws and the connecting metal 8. Furthermore, holes 15b are formed at the top and bottom ends of the central portion in the left-right direction of the fixing plate portion 15, which are used to confirm the position of the center mark. The one and other side plate portions 16 are plate-shaped portions that protrude in the same direction (towards the suspension beam 13) from both side edges of the fixed plate portion 15, and are formed with a plurality of screw holes 16a. When the building 1 is constructed using a steel framework construction method, fasteners such as bolts and drift pins are used as appropriate. When bolts are used as fasteners, nuts are used as necessary.

[0040] The receiving metal fitting 14 has a fixing plate portion 15 fixed to a part of the frame with a plurality of screws. The end portion of the suspension beam 13 is disposed between one and the other side plate portions 16 and fixed to these side plate portions 16. In other words, the suspension beam 13 and the receiving metal fitting 14 are connected by driving screws into the suspension beam 13 through a plurality of screw holes 16a in the one and the other side plate portions 16.

[0041] Whatever the dimension of the beam length of the suspension beam 13, the suspension beam 13 is arranged so that the top surface of the suspension beam 13 is flush with the top end surfaces of the one and other side plate portions 16 of the receiving hardware 14. In other words, whether the beam length of the suspension beam 13 is large and the lower end protrudes below the lower end of the receiving hardware 14, or whether the beam length is small and the lower end does not protrude below the lower end of the receiving hardware 14, the top surface of the suspension beam 13 and the upper end surface of the receiving hardware 14 are flush with each other. Furthermore, the connection between the suspension beam 13 and the receiving metal fittings 14 may not only be achieved by fixing with screws, but also by fixing with drift pins or bolts that pass through one and the other side plate portions 16 and the suspension beam 13.

[0042] As shown in Figure 6(a), the sound-proofing material 17 laid on the upper surface of the ceiling main body 11 is arranged so as to pass between the upper surface of the ceiling main body 11 and the lower surface of the suspension beam 13. Such sound-proofing material 17 is provided along all four walls (fire-resistant surface material 6) of the room on the lower floor 2. Furthermore, in order to achieve a good sound insulation effect, the sound insulation material 17 is laid so as not to straddle the suspension beams 13 as shown in Fig. 6(b) or to be interrupted at the position of the suspension beams 13 as shown in Fig. 6(c). In other words, if the sound insulation material 17 is arranged in the state shown in Fig. 6(a), it is possible to prevent an increase in the amount of sound insulation material 17 used and a decrease in the sound insulation effect at the position of the suspension beams 13.

[0043] Next, the manner in which the suspension beam 13 is attached to a part of the frame using the receiving metal fittings 14 will be described in detail.

[0044] (Attachment of the suspension beam to the suspension beam) In the example shown in FIG. 2, the skeleton of the building 1 includes a horizontal member 4 and a hanging beam 7. Here, the cross member 4 is the girth 4 mentioned above. The girth 4 is set to have a beam depth smaller than at least the main girder 3a, and in some cases, even smaller than the secondary girder 3b. As a result, the height position of the upper surface of the suspension beam 13 may be set so that it does not reach the height position of the lower surface of the girth 4, or if it does reach that height, it may be set to be only slightly higher. As a result, the girth 4 may not function as a fixing base that can ensure sufficient fixing strength for the support metal 14 with screws. In other words, it is difficult for a girth 4 with insufficient beam depth (downward protrusion) to support the suspension beam 13 via the support metal 14.

[0045] Therefore, in the example shown in FIG. 2, the suspension beam 7, which functions as a fixing base for the receiving metal member 14, is provided in a state of being suspended from the underside of the girth 4, which is a horizontal member. The hanging bundles 7 are, for example, square timbers with shorter vertical dimensions than the pillars, and their vertical dimensions are set to a length that does not protrude below the bottom surface of the girth 4 below the ceiling body 11. In other words, the vertical dimension of the hanging bundles 7 is set to the length from a position above the bottom surface of the ceiling surface material 11a on the ceiling body 11 to the bottom surface of the girth 4.

[0046] The suspension bundle 7 is fixed to the girth 4 via a metal joint 8. In this embodiment, the joint metal member 8 is a cylindrical joint member having through holes formed at the top and bottom ends into which shaft members such as drift pins and bolts are inserted. More specifically, an insertion hole into which the upper end of the connecting metal fitting 8 is inserted is formed at the position on the underside of the girth 4 where the hanging bundle 7 is joined, and an insertion hole into which the lower end of the connecting metal fitting 8 is inserted is formed at the upper end of the hanging bundle 7. Furthermore, an insertion hole into which a drift pin is inserted is formed through the girth 4 in the thickness direction, and an insertion hole into which a drift pin is inserted is also formed in the hanging bundle 7. The insertion hole for the drift pin in the girth 4 and the insertion hole for the drift pin in the hanging bundle 7 are formed in directions that intersect at right angles in a plan view.

[0047] The upper end of the connecting metal fitting 8 is inserted into the insertion hole of the girth 4, and the drift pin is inserted so that it passes through the insertion hole for the drift pin formed in the girth 4 and the through hole formed in the upper end of the connecting metal fitting 8, thereby fixing it to the girth 4. In addition, the connecting hardware 8 is fixed to the hanging bundle 7 by inserting its lower end into the insertion hole of the hanging bundle 7 and inserting the drift pin so that it passes through the insertion hole for the drift pin formed in the hanging bundle 7 and the through hole formed in the upper end of the connecting hardware 8. This allows the girth 4 and the suspension bundle 7 to be joined by the joint metal 8.

[0048] Fire-resistant face material 6 is attached to the indoor side of girth 4 and the indoor side of hanging beam 7. As described above, fire-resistant face material 6 is provided in a range from the lower floor surface material 2d to a height reaching girth 4. The upper end of fire-resistant face material 6 extends above the underside of girth 4.

[0049] In the example shown in Figure 2, the receiving hardware 14 is fixed by driving screws through the fire-resistant face material 6 toward the lower end of the girth 4 and the hanging beam 7. In other words, the screws are driven into multiple screw holes 15a in the fixing plate portion 15 of the receiving hardware 14. In the example shown in Figure 2, the support metal fittings 14 are arranged across the lower end of the girth 4 and the hanging beam 7 and fixed with screws, but this is not limited to this. In other words, if the height position of the upper surface of the hanging beam 13 (the height position of the upper end of the support metal fittings 14) does not reach the height position of the lower surface of the girth 4, the support metal fittings 14 will not cross the girth 4 and will Hanging bundle 7 It is fixed with screws only.

[0050] The suspension beam 13 has its longitudinal side ends supported by the receiving hardware 14 fixed to part of the frame as described above, and screws are driven into one and the other side plate portions 16 of the receiving hardware 14. In this way, the suspension beam 13 and the receiving hardware 14 are connected. The support metal fittings 14 are also fixed to the suspension bundles 7 on the side of the other girth 4 (the girder 3a may be substituted for the other girth 4) that is parallel to one of the girths 4 shown in Figure 2. This allows both ends of the suspension beam 13 in the longitudinal direction to be installed between the parallel girths 4 and the suspension bundles 7 installed on the undersides of these parallel girths 4. The suspended ceiling 10 is configured by attaching a plurality of hanging poles 12 to the suspension beams 13 installed as described above, and attaching the ceiling body 11 to the plurality of hanging poles 12.

[0051] (Attachment of the suspension beam to the column) In the example shown in FIG. 3, the skeleton of the building 1 includes a horizontal member 4 and a column 2e. Here, the horizontal member 4 is the girth 4, and the column 2e is the lower floor column 2e. The lower floor column 2e is perpendicular to the girth 4 and supports the girth 4 from below. Fire-resistant surface materials 6 are attached to the interior side of the girth 4 and the interior side of the lower floor column 2e. As described above, the fire-resistant surface materials 6 are provided in a range from the lower floor floor surface material 2d to a height reaching the girth 4. The upper end of the fire-resistant surface materials 6 extends above the lower surface of the girth 4.

[0052] In the example shown in Fig. 3, the receiving metal fitting 14 is fixed by driving screws toward the lower end of the girth 4 and the lower floor column 2e via the fire-resistant face material 6. In other words, the screws are driven into multiple screw holes 15a in the fixing plate portion 15 of the receiving metal fitting 14. 3, the receiving hardware 14 is arranged across the lower end of the girth 4 and the lower floor column 2e and fixed with screws, but this is not limited to this. In other words, if the height position of the upper surface of the suspension beam 13 (the height position of the upper end of the receiving hardware 14) does not reach the height position of the lower surface of the girth 4, the receiving hardware 14 is fixed with screws only to the lower floor column 2e without spanning the girth 4.

[0053] The suspension beam 13 has its longitudinal side ends supported by the receiving hardware 14 fixed to part of the frame as described above, and screws are driven into one and the other side plate portions 16 of the receiving hardware 14. In this way, the suspension beam 13 and the receiving hardware 14 are connected. The support metal fittings 14 are also fixed to the lower floor columns 2e on the side of the other girth 4 (the main girder 3a may be substituted for the other girth 4) that is parallel to one of the girths 4 shown in Figure 3. This allows both longitudinal ends of the suspension beam 13 to be installed between the parallel girths 4 and the lower floor columns 2e installed on the undersides of these parallel girths 4. The suspended ceiling 10 is configured by attaching a plurality of hanging poles 12 to the suspension beams 13 installed as described above, and attaching the ceiling body 11 to the plurality of hanging poles 12.

[0054] (Attachment of the suspension beam to the beam) In the example shown in FIG. 4, the skeleton of the building 1 includes a cross member 5 . Here, the cross member 4 is a beam 5 supported from below by the lower floor column 2e. The beam 5 is a horizontal member (beam 5) with a large beam depth that is provided in place of the girth 4 with a small beam depth, and the height position of its lower end face is located below the lower end of the receiving metal fitting 14. Fire-resistant surface materials 6 are attached to the interior side of the beams 5 and the interior side of the lower floor columns 2e. The fire-resistant surface materials 6 are provided in a range from the lower floor floor surface material 2d to a height that reaches the vertical center of the beams 5. The upper end of the fire-resistant surface materials 6 extends above the upper end of the receiving metal fittings 14.

[0055] In the example shown in Fig. 4, the receiving metal fitting 14 is fixed by driving screws toward the beam 5 through the fire-resistant surface material 6. That is, the screws are driven into a plurality of screw holes 15a in the fixing plate portion 15 of the receiving metal fitting 14. The height position of the lower end of the receiving metal fitting 14 is approximately equal to the height position of the lower end face of the beam 5, or is positioned higher than the height position of the lower end face of the beam 5. In other words, the lower end of the beam 5 protrudes downward below the lower end of the receiving metal fitting 14.

[0056] The suspension beam 13 has its longitudinal side ends supported by the receiving hardware 14 fixed to part of the frame as described above, and screws are driven into one and the other side plate portions 16 of the receiving hardware 14. In this way, the suspension beam 13 and the receiving hardware 14 are connected. The support metal fittings 14 are also fixed to the other beam 5 (the main girder 3a may be used instead of the other beam 5) that is parallel to one beam 5 shown in Figure 4. This allows both ends of the suspension beam 13 in the longitudinal direction to be installed between the parallel beams 5. The suspended ceiling 10 is configured by attaching a plurality of hanging poles 12 to the suspension beams 13 installed as described above, and attaching the ceiling body 11 to the plurality of hanging poles 12.

[0057] Regarding the manner of attaching the suspension beam 13 to a part of the structure using the support hardware 14, as described above, if the structure of the building 1 has a beam 5 with a large beam depth as shown in Figure 4, the support hardware 14 can be fixed with screws using the beam 5 as a fixing base. If there is no beam 5 with such a large beam depth and the lower floor column 2e is located below the girder 4 with a small beam depth, the support hardware 14 can be fixed with screws using the lower floor column 2e as the fixing base. On the other hand, if there is no beam 5 with a large beam depth, and there is a lower floor column 2e below the girder 4 with a small beam depth, but the lower floor column 2e is not positioned at the installation location of the suspension beam 13, a suspension bundle 7 can be provided below the girth 4, and the support hardware 14 can be fixed with screws using the suspension bundle 7 as a fixing base. The mounting modes of the suspension beams 13 shown in FIGS. 2, 3, and 4 may or may not be used together in one building 1.

[0058] (Suspended ceiling installation procedure) The suspended ceiling 10 is constructed after the skeleton of the building 1 is erected and the fire-resistant facing material 6 is attached to the indoor side of the skeleton. That is, after the fire-resistant facing material 6 is attached to the indoor side of the skeleton, the support metal fittings 14 are fixed with screws to a part of the skeleton via the fire-resistant facing material 6. Then, after the support metal fittings 14 are fixed with screws, the suspension beams 13 are installed, and the hanging beams 12 and ceiling body 11 are constructed. However, since sound-proofing material 17 is laid on the upper surface of the ceiling body 11 of the suspended ceiling 10, the construction of the upper floor floor surface material 3d on the floor of the upper floor 3 of the building 1's structure should be completed after the sound-proofing material 17 has been laid (although it may be completed partway).

[0059] (Effects of this embodiment) According to this embodiment, the following excellent effects are achieved. That is, the fire-resistant face material 6 extends from a position below the ceiling main body 11 to a position above the height of the support metal fittings 14, and the support metal fittings 14 are fixed with screws via the fire-resistant face material 6 toward a part of the frame to which the fire-resistant face material 6 is attached, so that the fire-resistant face material 6 can separate the frame and the suspension beams 13, and fire-resistant covering can be provided up to a position above the suspension beams 13 in the attic. Furthermore, the end of the suspension beams 13 can be supported by the support metal fittings 14 fixed with screws to a part of the frame, and the suspension beams 13 can be connected. Therefore, in a wooden frame building 1, the suspension beams 13 that support the ceiling main body 11 in a suspended state can be firmly fixed to the frame, which can improve the fire resistance of the attic while suppressing the transmission of vibration and sound between upper and lower floors.

[0060] Furthermore, the framework of building 1, which was constructed using the wooden framework construction method, includes girths 4 and hanging beams 7 suspended from the underside of girths 4, and since receiving hardware 14 is fixed with screws facing these hanging beams 7, even if there is no fixing base on the back side of fire-resistant face material 6 at the location where hanging beam 13 will be installed, hanging beams 7 can provide a fixing base for screw fixing. Therefore, in wooden framework building 1, hanging beams 13 that support ceiling body 11 in a suspended state can be firmly fixed to the framework.

[0061] Furthermore, the framework of building 1, which is constructed using wooden framework construction, includes girths 4 and columns 2e that are perpendicular to girths 4 and support girths 4 from below, and since support brackets 14 are fixed with screws toward these columns 2e, if a column 2e is provided on the back side of fire-resistant face material 6 at the location where suspension beam 13 will be installed, this column 2e can be secured as a fixing base for fixing screws. Therefore, in wooden framework building 1, suspension beam 13 that supports ceiling body 11 in a suspended state can be firmly fixed to the framework.

[0062] Furthermore, the framework of building 1, which was constructed using the wooden framework construction method, has beams 5 with a beam depth greater than girth 4, and receiving hardware 14 is fixed with screws facing these beams 5, so if beams 5 are provided on the back side of fire-resistant face material 6 at the location where suspension beams 13 will be installed, these beams 5 can be secured as a fixing base for screw fixing. Therefore, in building 1 constructed using the wooden framework construction method, suspension beams 13, which support ceiling body 11 in a suspended state, can be firmly fixed to the framework.

[0063] Furthermore, the fixing plate 15 is fixed to a part of the frame with screws via the fire-resistant surface material 6, and the end of the suspension beam 13 is positioned between one and the other side plate 16 that protrude from both side edges of the fixing plate 15, thereby making it possible to position the suspension beam 13 in the lateral direction. This makes it easier to install the suspension beam 13 in an accurate position.

[0064] Furthermore, since the suspension beams 13 are arranged horizontally in parallel with the multiple girders 3a that make up the floor of the upper floor 3, it is possible to prevent the suspension beams 13 and the girders 3a from interfering with each other by being arranged perpendicular to each other. This eliminates the need to arrange the upper surface of the suspension beams 13 lower than the lower surface of the girders 3a, making it possible to prevent the height position of the ceiling main body 11 supported by the suspension beams 13 from becoming lower. Therefore, for example, the ceiling height of the room on the lower floor 2 located below the ceiling main body 11 can be made higher compared to when the suspension beams 13 are arranged lower than the lower surfaces of the multiple girders 3a.

[0065] Furthermore, since the sound-insulating material 17 is arranged so as to pass between the upper surface of the ceiling body 11 and the lower surface of the suspension beam 13, a high sound-insulating effect can be achieved compared to, for example, a case in which the sound-insulating material 17 crosses over the top of the suspension beam 13 or is interrupted midway.

[0066] Furthermore, in recent years, there has been a demand for the realization of a decarbonized society through the promotion of carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and for the achievement of the SDGs (Sustainable Development Goals), and in the construction industry as well, efforts are being made to build buildings using wood, which has low carbon dioxide emissions.The suspended ceiling structure of this embodiment and the building 1 to which this suspended ceiling structure is applied are built using the wooden framework construction method, and therefore can contribute to the realization of a decarbonized society through the promotion of carbon neutrality and the achievement of the SDGs.

[0067] [Modification] The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention.

[0068] In the above embodiment, the floor of the upper floor 3 is provided as the superstructure of the suspended ceiling 10, but the superstructure may also be a roof. The roof may be a sloped roof or a flat roof. In addition, in the case of a flat roof, a roof balcony is also included. When a roof is used as the superstructure, the suspension beams 13 in the suspended ceiling 10 are installed so as to interfere as little as possible with the roof truss, for example by fastening support metal fittings 14 with screws to horizontal members such as rafters or roof beams, or by fastening support metal fittings 14 with screws to columns or suspension beams 7 on the floor directly below the roof that are perpendicular to the horizontal members. The fire-resistant surface material 6 also extends to the attic and is attached to horizontal members such as rafters or roof beams, columns, and suspension beams 7. As with the ceiling space described in the above embodiment, heat insulating materials and sound insulating materials 17 are appropriately installed in the attic space, contributing to improved fire resistance. [Explanation of symbols]

[0069] 1. Building 2 Lower floor 2e lower floor column 3 Upper floor 3a girder 3D upper floor floor material 4 Torso difference 5 Beam 6. Fire-resistant facing materials 7 Hanging bundle 8. Joint metal fittings 10 Suspended ceiling 11 Ceiling body 11a Ceiling surface material 11b Wild Edge 11c Noenuke 12 hanging tree 13 Hanging beam 14 Support hardware

Claims

1. A suspended ceiling structure arranged at intervals below the superstructure in a building constructed using a framework construction method, A fire-resistant surface material is attached to the indoor side of the building's skeleton, The body is A horizontal member to which the fire-resistant surface material is attached; The fire-resistant surface material is attached, and a hanging bundle is provided in a state of being hung from the underside of the cross member. The suspended ceiling is The ceiling itself, a plurality of hanging bars having lower ends to which the ceiling body is attached and which suspend and support the ceiling body from above; a wooden suspension beam to which the upper ends of the plurality of suspension beams are attached; A receiving hardware that receives the end of the suspension beam and is connected to the suspension beam, A suspended ceiling structure characterized in that the fire-resistant surface material extends from a position below the ceiling body to a position above the height of the receiving hardware, and the receiving hardware is fixed with a fixing material to the side of the hanging beam of the part of the body to which the fire-resistant surface material is attached, via the fire-resistant surface material.

2. The suspended ceiling structure according to claim 1, The body includes one horizontal member and the other horizontal member that are parallel to each other, The hanging bundle is provided on the underside of one of the cross members, and the hanging bundle is provided on the underside of the other cross member, The receiving hardware is provided on the side of the suspension bundle provided on one of the horizontal members and on the side of the suspension bundle provided on the other horizontal member, and is fixed by the fixing material, A suspended ceiling structure characterized in that the suspension beam is bridged between one of the horizontal members and the other of the horizontal members.

3. The suspended ceiling structure according to claim 1, The superstructure is an upper floor including at least a plurality of beams, a plurality of floor joists, and a floor surface material; the plurality of beams includes a plurality of girders; the cross member and the plurality of girders are arranged in parallel; The receiving hardware is provided on the side of the hanging bundle provided on the cross member and on the side of the girder, and is fixed by the fixing material, A suspended ceiling structure characterized in that the suspension beam is bridged between the cross member and the main beam.

4. The suspended ceiling structure according to claim 1, A suspended ceiling structure characterized in that the support metal fitting is arranged across the side of the cross member and the side of the hanging bundle in a part of the main body, and is fixed to the side of the cross member and the side of the hanging bundle with the fixing material.

5. The suspended ceiling structure according to claim 1, The receiving hardware is a fixing plate portion fixed to a part of the frame by the fixing material via the fire-resistant surface material; one and the other side plate portions protruding from both side edge portions of the fixing plate portion, A suspended ceiling structure characterized in that the ends of the suspension beams are arranged between the one and other side plate portions and fixed to these side plate portions.

6. The suspended ceiling structure according to claim 2, The superstructure is an upper floor including at least a plurality of beams, a plurality of floor joists, and a floor surface material; the plurality of beams includes a plurality of girders; A suspended ceiling structure characterized in that the suspension beam is arranged horizontally in parallel with the plurality of main beams.

7. The suspended ceiling structure according to any one of claims 1 to 6, A sound-insulating material is laid on the upper surface of the ceiling body, A suspended ceiling structure characterized in that the sound-proofing material is arranged so as to pass between the upper surface of the ceiling body and the lower surface of the suspension beam.

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