JP7659733B2 - Ceiling embedded device mounting structure - Google Patents

Description

The present invention relates to a mounting structure for ceiling-embedded devices, such as built-in air conditioners and ventilation fans, that are suspended and fixed above the ceiling, and in particular to a mounting structure for ceiling-embedded devices that are surrounded by a heat-insulating box.

A variety of air conditioners and ventilators have been known in the past that are ceiling-embedded. One method for supporting such ceiling-embedded devices in a building is to support the device so that it is suspended by fixing a hanging bracket protruding from the ceiling-embedded device to a hanging bolt supported by the building frame above the ceiling (see Patent Document 1 and Patent Document 2).

The mounting structure for the ceiling-embedded device described above has hanging hardware and hanging bolts attached to the ceiling-embedded device, and these hanging hardware and hanging bolts get in the way, making it difficult to wrap the ceiling-embedded device around the device when covering it with a mat of insulating material, and difficult to wrap it around without leaving any gaps. Also, when covering it with a board of insulating material, it is difficult to avoid interference with the hanging hardware and hanging bolts, and on-site processing such as cutting out is required, making the construction time-consuming.

Therefore, in order to facilitate the application of the thermal insulation coating and ensure a certain level of thermal insulation performance, the applicant of the present application proposed an installation structure for a ceiling-embedded device in which an insulation box with a downward opening is suspended from the building frame and the ceiling-embedded device is fixed inside the insulation box (see Patent Document 3).

JP 2000-320888 A JP 2001-235177 A JP 2017-146012 A

However, the insulation box in Patent Document 3 is made of glass wool board or rock wool board, and it is not possible to ensure the fire resistance equivalent to 15 mm of reinforced gypsum board required for a one-hour quasi-fire resistant structure. Therefore, in order to design a one-hour quasi-fire resistant structure while arranging a ceiling-embedded device, it is necessary to create a fire line made of 15 mm of reinforced gypsum board above the ceiling and the ceiling-embedded device, and to create a double ceiling structure in which the gypsum board that forms the ceiling and the ceiling-embedded device are suspended below the fire line.

However, if a double ceiling structure is used, the ceiling becomes lower, reducing the freedom of design and the risk of reduced livability. In addition, there is a problem that the double work of installing reinforced gypsum board for the fire line and installing the gypsum board for the ceiling is required, which increases the amount of construction work required. Furthermore, the members for suspending the ceiling embedded device penetrate the reinforced gypsum board that forms the fire line, making the construction more difficult and requiring additional construction work such as applying fireproof putty to the penetration parts to maintain the fire line.

The present invention aims to provide an installation structure for a ceiling-embedded device that can meet the specified fire resistance standards without significantly lowering the ceiling and can facilitate the application of heat insulating coatings.

The mounting structure for a ceiling embedding device of the present invention comprises a ceiling formed by a ceiling plate, a ceiling embedding device embedded in the ceiling space with its underside exposed in an opening provided in the ceiling, a heat-insulating box having an open bottom and including an upper plate and a side plate surrounding the ceiling embedding device, a flange protruding horizontally from the lower end of the side of the ceiling embedding device, a hanging part fixed to a receiving material supported by a building frame and hanging down vertically, and a frame-shaped connecting frame connecting the hanging part and the flange, the ceiling plate being made of reinforced gypsum board, and the heat-insulating box being made of a plate-shaped heat-insulating material. The insulating box is characterized in that an insulating layer made of a plate-shaped insulating material and a reinforced gypsum board layer of the same thickness as the ceiling board are laminated together, the side panels of the insulating box are arranged between the side of the ceiling embedded device and the hanging part, and are placed on a horizontal part formed at the lower end of the connecting frame, and the hanging part suspends the connecting frame so as to be adjustable in the vertical direction. The insulating box has a work opening provided in a position close to the hanging part of the side panel, and a cover plate is fitted into the work opening, and the cover plate is characterized in that an insulating layer made of a plate-shaped insulating material and a reinforced gypsum board layer of the same thickness as the ceiling board are laminated together .

The mounting structure of the ceiling-embedded device of the present invention is characterized in that the insulating box has an opening formed by cutting out a part of a side panel different from the side panel on which the service opening is provided, and an opening closing plate is fitted into the opening, and the opening closing plate is made by laminating an insulating layer made of a plate-shaped insulating material and a reinforced gypsum board layer of the same thickness as the ceiling panel, and has an insertion hole formed therein through which a duct can be inserted.

According to the mounting structure of the ceiling-embedded device of the present invention, the ceiling plate meets the specified fire resistance standard, and the insulation box meets the same specified fire resistance standard as the ceiling plate, so a fire line can be formed by the ceiling plate and the insulation box, and there is no need to create a double ceiling with a separate fire line formed above the ceiling and the ceiling-embedded device, so there is no need to lower the ceiling, which increases the freedom of design, and also reduces the amount of work required for construction because it is not a double ceiling.

The mounting structure of the ceiling-embedded device of the present invention makes the insulation box by laminating an insulation layer and a reinforced gypsum board layer of the same thickness as the ceiling board, so that it can reliably meet the same prescribed fire resistance standards as the ceiling board and ensure the desired insulation performance.

According to the mounting structure for the ceiling embedding device of the present invention, the side panel of the insulation box is disposed between the side surface of the ceiling embedding device and the hanging part, and is placed on the horizontal part formed at the lower end of the connecting frame, so that the insulation box can be held without unnecessary damage. The insulation box has an access port located close to the hanging part of the side panel, so that the height of the insulation box can be adjusted by adjusting the connecting frame in the vertical direction by operating the hanging part, and after the height adjustment, the access port can be blocked with a blocking plate on which an insulation layer and a reinforced gypsum board layer are laminated, making construction easy while meeting the specified fire resistance standards.

According to the mounting structure for the ceiling-embedded device of the present invention, the insulating box has an opening formed in a side panel different from the side panel on which the service opening is provided, and an opening cover plate is fitted into the opening. The opening cover plate has an insertion hole for inserting a duct, and the insulating layer and the reinforced gypsum board layer are laminated. This prevents a decrease in workability while minimizing the loss of the fire-resistant line, and by wrapping a fire-resistant covering material around the gap between the insertion hole and the duct, and around the duct, the mounting structure for mounting a ceiling-embedded device with a duct can meet the specified fire resistance standards.

1 is a cross-sectional view illustrating the overall configuration of a mounting structure for a ceiling embedded device. 4 is another cross-sectional view illustrating the overall configuration of the mounting structure for the ceiling embedded device. FIG. FIG. 4 is a perspective view illustrating the connecting frame and a hanging fitting fixed to the connecting frame. FIG. 4 is an exploded perspective view of the insulation box seen from diagonally above. FIG. 4 is an exploded perspective view of the insulation box as viewed obliquely from below. 1 is a cross-sectional view illustrating the reinforced gypsum board layer, the insulation layer, and the reinforcing steel plate of the insulation box. 13 is a side view illustrating the state in which the insulating box is inserted and placed inside the connecting frame. FIG. 13 is a perspective view illustrating the state in which the insulating box is inserted and placed inside the connecting frame. FIG. 13 is a diagram illustrating the state in which the upper end of the hanging fitting fixed to the connecting frame on which the insulation box is placed is fixed to the hanging bolt. FIG. 13 is a diagram illustrating the state in which the connecting frame on which the insulation box is placed is fixed to the hanging bolt via the hanging bracket, and after the height is adjusted, the working opening is closed with a blocking plate. 13 is a diagram illustrating the process of lifting the device body so that it is stored in the insulating box and fixing the flange to the horizontal part of the connecting frame. FIG. 13A and 13B are diagrams illustrating the state in which an opening closing plate is fitted into the opening of the insulation box. FIG. 4 is a diagram for explaining the state of connecting a duct and wiring to a ceiling embedded device.

Below, an embodiment of the ceiling embedding device mounting structure 2 according to the present invention will be described with reference to the drawings. As shown in Figs. 1 and 2, the ceiling embedding device mounting structure 2 includes a ceiling 22 formed by ceiling boards 21 on a ceiling joist 20 supported by a building frame (not shown), a ceiling embedding device 1 embedded in the ceiling space with its underside exposed in an opening in the ceiling 22, a hanging part 3 that suspends and fixes the ceiling embedding device 1 to a hanging wood support material 23 installed in the ceiling space, a connecting frame 4 that connects the hanging part 3 to the ceiling embedding device 1, and a heat-insulating box 5 that surrounds the ceiling embedding device 1.

The ceiling 22 is formed by fixing a ceiling board 21 made of reinforced gypsum board with a thickness of 15 mm to the ceiling joist 20. The ceiling board 21 has the non-combustibility required for a one-hour quasi-fireproof structure. The ceiling 22 has an opening through which the underside of the ceiling embedding device 1 can be exposed. The ceiling embedding device 1 is a device that is embedded in the ceiling space with its underside exposed from an opening provided in the ceiling 22, such as a built-in air conditioner, a bathroom dryer, or a ventilation fan. The ceiling embedding device 1 is equipped with a device main body 10 that is embedded in the ceiling space with its underside exposed to an opening provided in the ceiling 22, a flange 11 that protrudes horizontally from the lower end of the side of the device main body 10, and a louver 12 that is attached to the underside of the device main body 10. The device main body 10 of the ceiling embedding device 1 is provided with an adapter 13 to which a ventilation duct 14 can be attached on the side, as shown in FIG. 2. The ceiling embedding device 1 of the present invention may be of a shape that does not require the attachment of a duct 14. In addition, the main feature of the ceiling embedded device mounting structure 2 in this embodiment is the structure for mounting the ceiling embedded device 1, so the function and internal structure of the ceiling embedded device 1 itself will not be described.

The hanging section 3 has a hanging bolt 30 suspended from the hanging wood support 23, a hanging bracket 31 screwed to the connecting frame 4 and protruding upward from the connecting frame 4, and a nut 32 that secures the hanging bolt 30 and the hanging bracket 31. The hanging wood support 23 is a longitudinal member that is installed horizontally on a building structure such as a beam (not shown), and is a member that supports a hanging wood (not shown) that supports the ceiling joist 20. The upper end of the hanging bolt 30 is fixed to the hanging wood support 23, and hangs downward from the hanging wood support 23.

As shown in Figs. 1 and 3, the hanging bracket 31 is a member that is screwed to a fixing piece 40 provided at the upper end of the connecting frame 4. The upper end of the hanging bracket 31 is bent in a direction away from the device body 10, and is formed so as to have an inverted L shape when viewed from the side. The upper end of the hanging bracket 31 is formed with a notch 33 into which the hanging bolt 30 can be inserted. The hanging bolt 30 is inserted into this notch 33, and the upper end of the hanging bracket 31 is sandwiched between upper and lower nuts 32 that are screwed onto the hanging bolt 30, thereby fixing the hanging bolt 30 and the hanging bracket 31. The height of the hanging bracket 31 can be adjusted by tightening and loosening the upper and lower nuts 32 relative to the hanging bolt 30.

The connecting frame 4 has four fixing pieces 40 that protrude upward to be joined to the hanging hardware 31, a vertical section 41 that is rectangular and arranged parallel to the side of the device body 10 with a gap between them, the upper end of which is joined to the fixing pieces 40 and hangs down from the hanging hardware 31, and a horizontal section 42 that protrudes from the lower end of the vertical section 41 towards the device body 10 and fixes the flange 11 of the ceiling embedding device 1 to the lower side. The fixing pieces 40 are provided on two opposing sides of the upper end of the vertical section 41 of the connecting frame 4 so as to protrude upward, and the hanging hardware 31 is fixed to the fixing pieces 40 with screws.

As shown in Figs. 4 and 5, the insulation box 5 has a hollow rectangular parallelepiped shape consisting of one upper plate 50 and four side plates 51. The insulation box 5 has an open bottom and is shaped so that the device body 10 can be inserted from below. Two of the four side plates 51 of the insulation box 5 that face each other are provided with a work opening 52. The work opening 52 is formed by cutting the side plate 51 of the insulation box 5 from the bottom end to a predetermined height, so that a position close to the hanging part 3 of the side plate 51 is opened in a square shape, and a blocking plate 53 is fitted into the work opening 52. The blocking plate 53 is formed in a rectangular shape that completely closes the work opening 52. In addition, the insulation box 5 has circular wiring sleeves 54 on the two side plates 51 that do not have the work opening 52. The wiring sleeves 54 are formed in a row in two places on each side plate 51. The wiring sleeve 54 is provided with a blocking piece 55 that fits into the wiring sleeve 54, allowing the wiring sleeve 54 that is not being used to pull in the wiring 24 to be closed.

In addition, one of the side panels 51 that does not have a working opening 52 has an opening 56 formed by cutting out a portion of the side panel 51. The opening 56 is cut out from the bottom end of the side panel 51 to a predetermined height to form a rectangular opening. An opening closing plate 57 is fitted into the opening 56. The opening closing plate 57 is formed in a rectangular shape that matches the opening 56, and a notch 58 is formed in part of the bottom end to avoid interference with the ceiling embedded device 1, and an insertion hole 59 is formed in approximately the center of the opening closing plate 57 into which the duct 14 can be inserted.

As shown in FIG. 6, the insulating box 5 has a 15 mm thick reinforced plasterboard layer 60 on the inside, and a 25 mm thick insulating layer 61 made of micro glass wool with a density of 64K on the outside of the reinforced plasterboard layer 60. A reinforcing steel plate 62 that maintains its shape is provided on the outside of the insulating layer 61. In this embodiment, the reinforced plasterboard layer 60, the insulating layer 61, and the reinforcing steel plate 62 are provided in this order from the inside, but the order of these layers is not limited to this.

The blocking plate 53 that fits into the working opening 52 is formed by laminating a reinforced gypsum board layer 60 of 15 mm thickness, the same thickness as the body of the insulation box 5, a 25 mm thick insulation layer 61 of micro glass wool (64K), and a reinforcing iron plate 62. Similarly, the opening blocking plate 57 that fits into the opening 56 is formed by laminating a reinforced gypsum board layer 60 of 15 mm thickness, the same thickness as the body of the insulation box 5, a 25 mm thick insulation layer 61 of micro glass wool (64K), and a reinforcing iron plate 62. It is preferable that the blocking piece 55 that blocks the wiring sleeve 54 has a similar structure.

Next, a method for constructing the mounting structure 2 for the ceiling embedded device configured as described above will be described. In the mounting structure 2 for the ceiling embedded device, first, as shown in Figures 7 and 8, the insulation box 5 is placed inside the rectangular connecting frame 4. That is, the insulation box 5 is placed so that the lower end of the side plate 51 is placed on the horizontal part 42 of the connecting frame 4. At this time, the insulation box 5 is placed so that its access opening 52 is close to the hanging hardware 31 fixed to the fixed piece 40 of the connecting frame 4.

Next, as shown in FIG. 9, with the insulation box 5 placed on top, the notch 33 at the top end of the hanging bracket 31 fixed to the connecting frame 4 is fitted onto the hanging bolt 30 suspended from the hanging wood support 23, and hooked onto the nut 32 screwed onto the hanging bolt 30. Then, by tightening or loosening the nut 32 screwed onto the hanging bolt 30, the vertical position of the hanging bracket 31 is adjusted, and the connecting frame 4 is fixed in a position where the height of the horizontal part 42 is approximately equal to the height of the upper surface of the ceiling plate 21 that constitutes the ceiling 22.

After completing the height adjustment, as shown in FIG. 10, the blocking plate 53 is fitted to close the access opening 52. Then, as shown in FIG. 11, the wiring 24, such as the power wiring and remote control wiring, is pulled through the wiring sleeve 54. A blocking piece 55 is fitted into the wiring sleeve 54 that was not used to pull in the wiring 24, and the wiring sleeve 54 is closed.

Then, as shown in Figures 11 and 12, the ceiling embedded device 1 is raised so that the device body 10 is stored inside the heat-insulating box 5, while wiring 24 such as the power wiring and remote control wiring is connected to the device body 10, and the flange 11 is fixed to the horizontal part 42 of the connecting frame 4, for example with screws, and then the louver 12 is fixed to the underside of the device body 10. At this time, the ceiling embedded device 1 is positioned so that the adapter 13 for fixing the duct 14 is exposed from the opening 56. Then, the opening closing plate 57 is fitted into the opening 56. It is positioned so that the adapter 13 is exposed from the insertion hole 59 of the opening closing plate 57.

Then, as shown in FIG. 13, the duct 14 is connected to the adapter 13 inside the insertion hole 59. After that, although not shown, the duct 14 and the gap between the duct 14 and the insertion hole 59 are covered with a fire-resistant covering material such as heat-resistant rock wool. After that, the ceiling boards 21 are fixed to the ceiling joists 20 around the periphery of the ceiling embedding device 1 to form the ceiling 22.

In this way, the insulation box 5, the blocking plate 53 that blocks the work opening 52 of the insulation box 5, the opening blocking plate 57 that fits into the opening 56 of the insulation box 5, and the blocking piece 55 that blocks the wiring sleeve 54 are formed with a 25 mm thick insulation layer 61 of micro glass wool (64K), so that even if an opening is made in the ceiling 22 and the ceiling embedding device 1 is installed, the insulation performance of the ceiling 22 is not reduced. Moreover, the insulation box 5 is arranged so that its side plate 51 is placed between the side of the device main body 10 and the vertical part 41 and surrounds the device main body 10 so as to be placed on the upper surface of the horizontal part 42, so that the side of the insulation box 5 does not interfere with the connecting frame 4 or the hanging hardware 31, and the blocking plate 53 can be easily attached and detached, preventing a decrease in insulation performance due to interference with other components.

The insulation box 5, the blocking plate 53 that blocks the work opening 52 of the insulation box 5, the opening blocking plate 57 that fits into the opening 56 of the insulation box 5, and the blocking piece 55 that blocks the wiring sleeve 54 are provided with a 15 mm thick reinforced gypsum board layer 60 that can be used for a 1-hour quasi-fire resistant structure, and the ceiling board 21 that forms the ceiling 22 also uses a similar 15 mm thick reinforced gypsum board, so that the ceiling 22 and the insulation box 5 can form a fire prevention line that meets the standards for a 1-hour quasi-fire resistant structure.

In this way, there is no need to provide a fire line within the ceiling pocket in addition to the ceiling 22, so the ceiling 22 does not become lower, construction work can be reduced, and the space below the ceiling 22 can be made highly livable.

It goes without saying that the embodiment of the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate without departing from the scope of the concept of the present invention.

The ceiling-embedded device mounting structure 2 according to the present invention can be suitably used, for example, as a structure for mounting a built-in air conditioner.

REFERENCE SIGNS LIST 1 Ceiling embedded device 2 Mounting structure for ceiling embedded device 3 Suspension portion 4 Connecting frame 5 Insulation box 11 Flange 14 Duct 21 Ceiling plate 22 Ceiling 42 Horizontal portion 51 Side plate 52 Access opening 53 Closing plate 56 Opening 57 Opening closing plate 59 Insertion hole 60 Reinforced gypsum board layer 61 Insulation layer

Claims (2)

A ceiling formed by a ceiling board;
a ceiling embedding device that is embedded in the ceiling space with its lower surface exposed through an opening provided in the ceiling;
a heat-insulating box having an open bottom and an upper plate and a side plate surrounding the ceiling embedded device;
A flange protruding horizontally from a lower end of a side surface of the ceiling embedding device;
A hanging part that is fixed to a receiving material supported by the structure and hangs down vertically;
a frame-shaped connecting frame that connects the hanging portion and the flange;
Equipped with
The ceiling board is a reinforced gypsum board,
The insulation box is formed by laminating an insulation layer made of a plate-shaped insulation material and a reinforced gypsum board layer having the same thickness as the ceiling board,
The heat-insulating box has a side panel disposed between a side surface of the ceiling embedding device and the hanging portion, and is placed on a horizontal portion formed at a lower end of the connecting frame,
The suspending portion suspends the connecting frame so as to be adjustably movable in the up-down direction,
The heat-insulating box has an access opening provided at a position adjacent to the hanging portion of the side plate, and a closing plate is fitted to the access opening,
A mounting structure for a ceiling embedded device, characterized in that the closing plate is a laminate of an insulating layer made of a plate-shaped insulating material and a reinforced gypsum board layer having the same thickness as the ceiling plate . The heat-insulating box has an opening formed in a side plate different from the side plate on which the work opening is provided, the opening being formed by cutting out a part of the side plate,
An opening closing plate is fitted into the opening,
The ceiling mounting structure of claim 1, wherein the opening cover plate is formed by laminating an insulating layer made of plate-shaped insulating material and a reinforced gypsum board layer of the same thickness as the ceiling plate , and an insertion hole through which a duct can be inserted is formed.

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