JP6803773B2 - Installation structure of air conditioning duct - Google Patents

Description

The present invention relates to an installation structure of an air conditioning duct.

The following Patent Document 1 discloses a method of transporting an air-conditioning duct temporary fixing jig and a building unit used for temporarily fixing an air-conditioning duct arranged on the back surface side of a ceiling surface material. Briefly, an air-conditioning duct is arranged in advance on the back side of the ceiling surface material in the factory, and the air-conditioning duct is temporarily fixed to the ceiling beam with a hat-shaped temporary fixing tool. ..

According to the above configuration, the air-conditioning duct is arranged on the back side of the ceiling surface material of the building unit and is transported to the construction site in a state where it is temporarily fixed to the ceiling beam by using a temporary fixing jig. Will be done. Then, after installing the building unit on the first floor, the temporary fixing jig is removed. This makes it possible to prevent the air conditioning duct from moving and being damaged during transportation of the building unit.

Japanese Patent No. 5275670

However, in the case of the method of transporting the air-conditioning duct temporary fixing jig and the building unit described in Patent Document 1, since the structure is such that a piping hole for inserting the air-conditioning duct is formed in the ceiling girder, the building unit The strength decreases. Therefore, it is necessary to take measures such as increasing the thickness of the ceiling girder.

In consideration of the above facts, the present invention improves the efficiency of on-site assembly work without affecting the frame of the building unit when an air conditioning duct is arranged on the back side of the ceiling surface material. The purpose is to obtain an installation structure for air conditioning ducts that can be used.

Installation structure of the air-conditioning duct according to the first aspect, one end portion faces the back side of the ceiling surface material of the building units, is a fitting portion for connection of the assembly duct portion, the other end portion ceiling girder A straight pipe portion that passes through the lower side of the building , penetrates the outer wall of the building unit, and protrudes to the outside of the building unit, and is provided with an elbow portion that is stored in a storage portion provided inside the building unit. , Has an installation duct section assembled to the building unit.

In the installation structure of the air-conditioning duct according to the first aspect, the installation duct portion assembled to the building unit includes an elbow portion. This elbow portion is housed in a storage portion provided inside the building unit, and one end of the elbow portion is used as a fitting portion for connecting the assembly duct portion, and the back surface side of the ceiling surface material of the building unit. The other end of the elbow portion is a straight pipe portion that protrudes to the outside of the building unit, passes through the lower side of the ceiling girder, and penetrates the outer wall of the building unit.
That is, in the installation structure of the air conditioning duct according to the first aspect, the installation duct portion connected to the outside of the building unit passes through the lower side of the ceiling girder and projects outward from the outer wall of the building unit. Since it is installed, the duct does not penetrate the ceiling girder. Therefore, the air conditioning duct can be installed without affecting the strength of the frame of the building unit.

Further, according to the first aspect, the air conditioning duct includes an assembly duct portion, an installation duct portion connected to the assembly duct portion, and an installation duct portion that passes through the indoor side and projects outward from the outer wall of the building unit. Will be done. As a result, the assembly duct portion and the installation duct portion can be independently assembled to the building unit, so that the efficiency of assembling the air conditioning duct at the site can be improved.

The installation structure of the air conditioning duct according to the second aspect is such that, in the first aspect, the assembled duct portion is located on the upper side of the building of the ceiling beam arranged on the back surface side of the ceiling surface material of the building unit. The first duct portion is arranged and one end portion is drawn into the building unit from the first lead-in portion provided on the ceiling surface material, and the one end portion is arranged on the upper side of the building of the ceiling beam. The other end of the first duct portion is connected to the upper side of the building of the girder, the other end is opposed to the second retractable portion provided on the ceiling surface material, and the fitting is made through the second retractable portion. It is configured to include a second duct portion connected to the joint portion.

According to the installation structure of the air conditioning duct according to the second aspect, since the assembled duct portion is configured to include the first duct portion and the second duct portion, it is necessary to adjust the position on the first lead-in portion side. The assembling work of the first duct portion and the assembling work of the second duct portion that requires the position adjustment on the second lead-in portion side can be performed in parallel. Therefore, the working time of the installation work of the air conditioning duct can be shortened.

In the second aspect of the installation structure of the air conditioning duct according to the third aspect, the assembled duct portion is arranged between the first duct portion and the ceiling beam in the vicinity of the first lead-in portion. A second spacer which is thinner than the first spacer and is arranged between the second duct portion and the ceiling beam in the vicinity of the second retracting portion. Have.

According to the installation structure of the air conditioning duct according to the third aspect, the thickness of the second spacer is made thinner than the thickness of the first spacer, and the air conditioning duct is arranged between the air conditioning duct and the ceiling beam. , A downward slope is provided in the vertical direction of the building from the first duct portion to the second duct portion. Therefore, the exhaust gas discharged from the first duct portion drawn into the building unit toward the upper side of the building is exhausted from the first duct portion to the outside of the building unit via the second duct portion and the installation duct portion. As a result, the exhaust gas containing water and oil discharged from the inside of the building unit is stably discharged to the outside of the building unit without staying or backflowing in the air conditioning duct, and rainwater flows in from the outside of the building unit. Can be prevented.

Installation structure of the air-conditioning duct according to the fourth aspect, in any one of the first aspect to third aspect, the front room features product having a KiOsamu housed portion is assembled inside the building units ing.

According to the installation structure of the air-conditioning duct according to the fourth aspect, it is installed by assembling an indoor product having a storage part for storing the installation duct part exposed inside the building unit inside the building unit. The duct portion can be stably supported, and the elbow portion of the installation duct portion cannot be seen from the inside of the building unit, so that the aesthetic appearance of the inside of the building unit can be maintained.

In any one of the first to fourth aspects, the installation structure of the air conditioning duct according to the fifth aspect is such that the building unit is factory-produced and the installation duct portion is the building unit. It is assembled to the building unit at the stage of factory production , and the assembly duct portion is connected to the fitting portion of the installation duct portion on the back surface side of the ceiling surface material when the building unit is installed at the construction site. At the same time, it is assembled on the back side of the ceiling surface material.

According to the installation structure of the air-conditioning duct according to the fifth aspect, the installation duct part having an elbow part and requiring work time for assembly and adjustment is installed in advance at the time of manufacturing the building unit for air-conditioning at the construction site. The work time when assembling the duct to the building unit can be shortened. Further, at the construction site, since the pre-assembled assembly duct portion may be assembled to the building unit and the installation duct portion, the air conditioning duct can be easily assembled to the building unit.

Further, according to the fifth aspect, the assembling duct portion to be assembled on the back surface side of the ceiling surface material is not attached to the building unit when the building unit is transported to the construction site. Therefore, when the building unit is loaded and transported on the vehicle, it is not necessary to cover the duct with a protective member, so that the height limit of the load can be satisfied.

As described above, the installation structure of the air-conditioning duct according to the present invention does not affect the skeleton frame of the building unit when the air-conditioning duct is arranged on the back side of the ceiling surface material, and at the site. It has an excellent effect that the assembly work efficiency of the above can be improved.

It is a schematic perspective view of the building unit provided with the installation structure of the air-conditioning duct which concerns on this embodiment. (A) is a side view of the air conditioning duct shown in FIG. 1, and (B) is a plan view thereof. It is an exploded side view of the air conditioning duct shown in FIG.

Hereinafter, an embodiment of the unit building according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a perspective view of the building unit 10 constituting the unit building. As shown in this figure, the building unit 10 includes four outer pillars 14 erected at four corners, a rectangular frame-shaped floor frame 20 connecting the lower ends of these outer pillars 14, and an outer pillar. It is formed in a box shape by a rectangular frame-shaped ceiling frame 22 that connects the upper ends of 14 to each other. A square steel pipe column is used for the outer column 14.

The ceiling frame 22 is bridged between a pair of gable-side ceiling beams 16A arranged on the long side, a pair of gable-side ceiling beams 16B arranged on the short side, and a pair of gable-side ceiling beams 16A. It is configured to include a plurality of ceiling beams 28. The girder-side ceiling girder 16A and the floor-side ceiling girder 16B are both channel steels, and when it is not necessary to distinguish between them, they are collectively referred to as "ceiling girder 16". Further, a rectangular flat plate-shaped ceiling surface material 26 is attached to the lower surface side of the ceiling beam 28.

Similarly, the floor frame 20 spans between a pair of gable-side floor girders 18A arranged on the long side, a pair of gable-side floor girders 18B arranged on the short-side side, and a pair of girder-side floor girders 18A. It is composed of a plurality of floor beams (not shown) that have been passed. The girder-side floor girder 18A and the floor-side floor girder 18B are both channel steels, and when it is not necessary to distinguish between them, they are referred to as "floor girder 18". Further, a rectangular flat plate-shaped floor surface material 25 is attached to the upper surface side of the floor beam.

As shown in FIG. 2, a metal outer wall frame 29 and an outer wall material fixed to the outdoor side surface of the outer wall frame 29 are provided on the outdoor side surfaces of the ceiling girder 16 and the floor girder 18 having the above configuration. An outer wall 31 configured to include the 30 is attached. An inner wall surface material 32 is attached to the indoor side of the outer wall 31. Further, a heat insulating material 34 is interposed between the outer wall surface material 30 and the inner wall surface material 32.

An air conditioning duct 36 is arranged on the back surface side of the ceiling surface material 26 of the building unit 10 described above. Both ends of the air conditioning duct 36 are open, and the air conditioning duct 36 is arranged on the upper side of the building of the ceiling beam 28 arranged on the back surface side of the ceiling surface material 26 of the building unit 10, and the first end 38 is the ceiling surface material. It is pulled into the building unit 10 from the first pull-in portion 40 provided in 26. The second end 42, which is the other end, passes from the second retractable portion 44 provided on the ceiling surface material 26 to the lower side of the building of the ceiling girder 16B, and from the outer wall 31 of the building unit 10 to the outside of the building unit 10. It is assembled to the building unit 10 so as to protrude.

The above-mentioned air-conditioning duct 36 includes a first duct portion 48 and a second duct portion 50 as assembly duct portions to be assembled on the ceiling frame 22 when the building unit 10 is installed at a construction site, and at the time of factory production of the building unit 10. The installation duct portion 52, which is preliminarily assembled to the building unit 10, is configured as a main portion.

The first duct portion 48 is formed in an L shape in which an outer cylinder 56 made of a metal circular pipe is bent by the first bent portion 56. A heat insulating material (not shown) is wound around the outer peripheral portion of the first duct portion 48. The first end 38 (one end of the first duct), which is the lower end of the vertical portion of the first duct 48, is located on the lower side of the building from the first lead-in 40, which is an opening formed in the ceiling surface material 26. Is being drawn towards. A range hood 54 is arranged on the lower side of the building at the first end 38. Further, the horizontal portion of the first duct portion 48 is arranged parallel to the ceiling surface material 26, and the opening end portion of this horizontal portion is regarded as the first connection portion 58 (the other end portion of the first duct portion). ing.

On the other hand, the second duct portion 50 is formed in an L shape in which the outer cylinder 46, which is a metal circular pipe, is bent by the second bent portion 70. A heat insulating material (not shown) is wound around the outer peripheral portion of the first duct portion 48. The second connecting portion 72, which is the lower end of the vertical portion of the second duct portion 48, is arranged so as to face the second lead-in portion 44, which is an opening formed in the ceiling surface material 26, in the vertical direction of the building. There is. Further, the horizontal portion of the second duct portion 50 is arranged parallel to the ceiling surface material 26, and the open end portion of this horizontal portion is regarded as the second end portion 62 (one end portion of the second duct portion). There is. One end of a cylindrical connecting member 64 is inserted into the second end 62. An annular locking portion 68 is formed on one end side of the outer peripheral portion of the connecting member 64, and when the one end portion of the connecting member 64 is inserted into the second end portion 62 of the second duct portion 50. It is used as a stopper. Then, the other end of the connecting member 64 (one end of the second duct portion) is inserted into the first connecting portion 58 of the first duct portion 48. As a result, the first duct portion 48 and the second duct portion 50 are connected via the connecting member 64.

The installation duct portion 52 is attached to the wall of the building unit 10. Specifically, the installation duct portion 52 is composed of an elbow portion 78 in which a circular pipe is bent in an L shape and a straight pipe portion 80, and is made of metal. A cylindrical fitting portion 76 having a reduced diameter is integrally formed at the upper end portion of the elbow portion 78. The fitting portion 76 vertically penetrates the second retracting portion 44 from the lower side to the upper side of the ceiling surface material 26. Then, the second connecting portion 72 (the other end of the second duct portion) of the second duct portion 50 is fitted into the fitting portion 76 from the upper side of the ceiling surface material 26, so that the second duct portion 50 and the second duct portion 50 are fitted. It is connected to the installation duct portion 52.

The base end portion of the straight pipe portion 80 is connected to the lower end portion of the elbow portion 78. The straight pipe portion 80 is arranged horizontally, penetrates the above-mentioned outer wall 31, and further projects horizontally to the outside of the building unit 10. An external hood 82 is attached so as to cover the tip of the straight pipe portion 80. The outer hood 82 may be attached to the tip of the straight pipe portion 80, or may be attached to the outer wall surface material 30. Further, the mounting height of the straight pipe portion 80 is predetermined and cannot be lowered.

Further, in the building unit 10, a ceiling hanging cupboard 84 as an indoor product provided with a recess 86 (storage portion) for accommodating the installation duct portion 52 is arranged. The upper part of the ceiling hanging cupboard 84 is formed in a staircase shape, and the recess 86 formed in the upper part is fixed to the inner wall surface material 32 so as to face the inner wall surface material 32 side. The recess 86 has a size capable of accommodating the exposed portion of the elbow portion 78 of the installation duct portion 52, and the exposed portion of the elbow portion 78 is accommodated in the recess 86 in the state after the ceiling suspension cabinet 84 is attached. ing. Therefore, regardless of whether the door of the ceiling hanging cabinet 84 is opened or closed, the elbow portion 78 is not exposed to the living room side of the building unit 10.

Further, a first spacer 60 and a second spacer 74 are arranged on the lower side of the above-mentioned air conditioning duct 36. The first spacer 60 is arranged on the side of the first duct portion 48, is bridged over the adjacent ceiling beams 28, and is interposed between the ceiling beams 28 and the horizontal portion of the first duct portion 48. There is. The second spacer 73 is arranged on the side of the second duct portion 50, is bridged over the adjacent ceiling beams 28, and is interposed between the ceiling beams 28 and the second duct portion 50. The thickness of the second spacer 74 is set to be thinner than the thickness of the first spacer 60. As a result, a downward gradient of about 0.5% is set from the first duct portion 48 to the second duct portion 50 in the same direction as the exhaust flow.

Next, a method of installing the air conditioning duct 36 according to the present embodiment in the building unit 10 will be described.

The first duct portion 48 (including the connecting member 64), the second duct portion 50, and the installation duct portion 52 constituting the air conditioning duct 36 are sub-assembled in advance in the factory separately from the building unit 10. The sub-assembly may be performed in the factory, or the sub-assembly by the duct maker may be carried into the factory.

In the factory, only the installation duct portion 52 is installed in the building unit 10. Specifically, the outer wall 31 is horizontally penetrated through the straight pipe portion 80 connected to the elbow portion 78, and the second retractable portion 44 is vertically penetrated through the fitting portion 76 of the elbow portion 78. Then, in this state, the installation duct portion 52 composed of the elbow portion 78 and the straight pipe portion 80 is fixed to the inner wall surface material 32 from the inner side of the building unit 10. After that, the ceiling hanging cupboard 84 is assembled to the inner wall surface material 32. When the ceiling hanging cupboard 84 is fixed, the exposed portion of the elbow portion 78 is covered in the recess 86. Since the elbow portion 78 is supported by the ceiling hanging cabinet 84 in a state of being in contact with the ceiling hanging cabinet 84 from below, the elbow portion 78 does not necessarily have to be fixed to the inner wall surface material 23. After that, the external hood 82 is assembled from the outside of the building unit 10 to the tip of the straight pipe portion 80. The order of assembling the ceiling hanging cupboard 84 and the external hood 82 may be reversed, or the external hood 82 may be assembled at the construction site.

The assembled building unit 10 is then transported to the construction site. At this time, since the first duct portion 48 and the second duct portion 50 of the air conditioning duct 36 are not arranged on the ceiling frame 22 of the building unit 10, the height limitation of the load is cleared without any problem. There is.

At the construction site, a required number of building units including the building unit 10 are suspended by a crane and sequentially installed. At this time, the building unit 10 to which the installation duct portion 52 is pre-assembled is installed on the first floor of the unit building. Then, before the building unit on the second floor is suspended on the building unit 10 installed on the first floor, the connection work of the air conditioning duct 36 is performed.

Prior to the connection work of the air conditioning duct 36, the first spacer 60 and the second spacer 74 are installed at predetermined positions on the ceiling beam 28 of the ceiling frame 22. Next, the assembly work of the first duct portion 48 is performed on the first spacer 60 side, and the assembly work of the second duct portion 50 is performed on the second spacer 74 side. Specifically, the first duct portion 48 is placed on the first spacer 60 while the first end portion 38 of the first duct portion 48 is inserted into the first retracting portion 38. On the other hand, on the second duct portion 50 side, the second connecting portion 72 of the second duct portion 50 is attached from top to bottom to the fitting portion 76 of the elbow portion 78 protruding from the first retracting portion 44 toward the upper side of the building. The second duct portion 50 is placed on the second spacer 74 while being fitted so as to be dropped into the second duct portion 50. After that, the end portion of the connecting member 64 of the second duct portion 50 is inserted into the first connecting portion 58 of the first duct portion 48 for connection. At this time, the assembly error, the manufacturing error of the first duct 48, the second duct 50, and the like can be determined by adjusting the insertion amount of the first duct portion 48 at the end of the connecting member 64 into the first connecting portion 58. Be absorbed.

A heat insulating material (not shown) is wound around the outer peripheral surfaces of the first duct portion 48 and the second duct portion 50.

After the assembly work of the air conditioning duct 36 is completed, the range hood 54 is attached to the ceiling surface material 26 so as to cover the first end 38 in the building unit 10.

Next, the operation and effect of this embodiment will be described.

In the installation structure of the air conditioning duct according to the present embodiment, the installation duct portion 52 connected to the outside of the building unit 10 passes through the lower side of the ceiling girder 16B and projects outward from the outer wall of the building unit 10. Since it is assembled to 10, the air conditioning duct 36 does not penetrate the ceiling girder 16B. Therefore, it is possible to install the air conditioning duct 36 without affecting the strength of the frame of the building unit 10.

Further, in the present embodiment, the first duct portion 48 and the second duct portion 50, which are the assembly duct portions, and the installation duct portion 52 can be independently assembled to the building unit 10. Therefore, the efficiency of assembling the air conditioning duct 36 at the site can be improved, and the construction period can be shortened.

Summarizing the above, according to the present embodiment, when the air conditioning duct 36 is arranged on the back surface side of the ceiling surface material 26, it is assembled at the site without affecting the skeleton frame of the building unit 10. Work efficiency can be improved.

Further, according to the present embodiment, the thickness of the first spacer 60 is made thicker than the thickness of the second spacer 74 and is arranged between the air conditioning duct 36 and the ceiling beam 28. As a result, a downward slope is provided from the first duct portion 48 toward the second duct portion 50 without providing a jig or the like for pulling up the first duct portion 48 and the second duct portion 50 toward the upper side of the building. Therefore, the exhaust gas drawn inside the building unit 10 and sucked into the first duct portion 48 is exhausted to the outside of the building unit 10 through the first duct portion 48, the second duct portion 50, and the installation duct portion 52. Duct. As a result, the exhaust gas containing water and oil discharged from the inside of the building unit 10 is stably discharged to the outside of the building unit 10 without staying or flowing back in the air conditioning duct 36, and the rainwater of the building unit 10 It is possible to prevent inflow from the outside. Further, since the air conditioning duct 36 is arranged on the upper side of the building of the first spacer 60 and the second spacer 74, the air conditioning duct 36 is stably mounted on the ceiling surface of the first spacer 60 and the second spacer 74. There is also an advantage that the material 26 can be assembled on the upper side of the building.

Further, according to the present embodiment, according to the present embodiment, the installation duct is assembled by assembling the ceiling hanging cabinet 84 for accommodating the installation duct portion 52 exposed inside the building unit 10 inside the building unit 10. Since the installation duct portion 52 can be stably supported and the installation duct portion 52 cannot be visually recognized from inside the building unit, the aesthetic appearance inside the building unit 10 can be maintained.

Further, in the present embodiment, the first duct portion 48 and the second duct portion 50, which are the assembly duct portions, can be piped between the floors of the building unit, and it is not necessary to provide a descending ceiling to pass the pipes. The indoor space can be widened without lowering the ceiling height of the room.

In addition to these, the air conditioning duct 36 is divided into a first duct portion 48 and a second duct portion 50, which are assembly duct portions, and an installation duct portion 52, and the first duct portion 48 and the second duct portion It was decided that the assembly work of 50 would be the on-site work at the construction site, and the assembly work of the installation duct portion 52 would be completed in the factory. Therefore, it is not necessary to perform the installation duct portion 52, which takes the longest work time, at the construction site, and at the construction site, it is sufficient to perform the installation work of each of the first duct portion 48 and the second duct portion 50 and the connection work between them. As a result, the work time at the construction site can be significantly shortened, and the assembly work efficiency at the site can be improved. Further, in this case, it is not necessary to assemble the first duct portion 48 and the second duct portion 50 on the ceiling frame 22 when the building unit 10 is transported. Therefore, it is not necessary to provide a cover that covers the air conditioning duct 36, and the height limitation of the load during transportation from the factory to the construction site can be satisfied.

In the present embodiment, the installation duct portion 52 has been described as being assembled in the factory, but the present invention is not limited to this, and the installation duct portion 52 may be assembled in the building unit 10 at the construction site.

Further, in the present embodiment, the first duct portion 48 and the second duct portion 50 as the assembling duct portion have been described as being assembled at the construction site when the building unit 10 is installed, but the loading limitation is not limited to this. If you are satisfied, you may arrange all the air conditioning ducts on the back side of the ceiling surface material in advance at the factory.

Further, in the present embodiment, the ceiling hanging cupboard 84 has been described as being attached in advance in the factory, but the present invention is not limited to this, and the ceiling hanging cupboard 84 may be assembled inside the building unit 10 at the construction site. When the installation duct portion 52 is pre-assembled to the building unit 10, the ceiling hanging cabinet 84 can be assembled relatively easily as in the case of mounting at a factory.

10 Building unit 16 Ceiling girder 26 Ceiling surface material 28 Ceiling girder 36 Air conditioning duct 38 1st end (one end of 1st duct)
40 1st retractable portion 44 2nd retractable portion 48 1st duct portion (assembled duct portion)
50 Second duct part (assembled duct part)
52 Installation duct part 58 First connection part (the other end of the first duct part)
60 1st spacer 62 2nd end (one end of 2nd duct)
72 Second connection (the other end of the second duct)
74 Second spacer 76 Fitting part (one end of the installation duct part)
78 Elbow part 80 Straight pipe part (the other end of the installation duct part)
84 Ceiling hanging cupboard (indoor crop)
86 Recess (storage part)

Claims (5)

One end faces the back surface side of the ceiling surface material of the building units, is a fitting portion for connection of the assembly duct portion, the other end through the outer wall of the street the building unit building below the ceiling girder An air conditioner having an elbow portion that is a straight pipe portion that protrudes to the outside of the building unit and is stored in a storage portion provided inside the building unit, and has an installation duct portion that is assembled to the building unit. Duct installation structure. The assembled duct portion is
The ceiling beams arranged on the back surface side of the ceiling surface material of the building unit are arranged on the upper side of the building, and one end thereof is drawn into the building unit from the first lead-in portion provided on the ceiling surface material. The first duct part and
The ceiling beam is arranged on the upper side of the building, one end is connected to the other end of the first duct portion on the upper side of the ceiling beam, and the other end is provided on the ceiling surface material. 2 A second duct portion facing the lead-in portion and connected to the fitting portion via the second lead-in portion, and a second duct portion.
The installation structure of the air-conditioning duct according to claim 1, which is configured to include the above. The assembled duct portion includes a first spacer arranged between the first duct portion and the ceiling beam in the vicinity of the first lead-in portion.
A second spacer that is thinner than the first spacer and is arranged between the second duct portion and the ceiling beam in the vicinity of the second lead-in portion.
The installation structure of the air conditioning duct according to claim 2. Installation structure of the air-conditioning duct according to prior room features product having a KiOsamu pay part any one of claims 1 to 3 assembled in the interior of the building units. The building unit is factory-produced
The installation duct portion is assembled to the building unit at the stage of the factory production of the building unit.
When the building unit is installed at the construction site, the assembly duct portion is connected to the fitting portion of the installation duct portion on the back surface side of the ceiling surface material and is assembled to the back surface side of the ceiling surface material. The installation structure of the air conditioning duct according to any one of claims 1 to 4.