JP7287298B2 - Ventilation duct construction method and ventilation structure - Google Patents

Description

The present invention relates to a construction method and a ventilation structure for ventilation ducts in ceilings or walls of buildings.

A ventilation duct may be inserted through the ceiling or wall of the building.

For example, in the mounting structure of an air conditioning ventilation device described in Patent Document 1, a gap formed between the ventilation duct and the inner peripheral surface of the wall surface material forming the duct insertion hole is closed with a caulking material, thereby reducing the gap. It prevents sound leakage through Specifically, as shown in FIG. 1 of Patent Document 1, the mounting structure of the air conditioning ventilator described in Patent Document 1 includes two wall materials (10b) horizontally spaced apart. , (10c) and the two wall materials (10b) and (10c), the duct insertion holes (through holes 12) passing through each of them, and the ventilation duct (outer cylinder body 13), and a caulking material (14) that fills the gap formed between the inner peripheral surface of the wall material forming the duct insertion hole (through hole 12) and the ventilation duct (outer cylindrical body 13). ing.

Japanese Utility Model Laid-Open No. 61-029237

In the attachment structure of the air conditioning ventilator, the caulking material is provided on the outer peripheral surface side of the ventilation duct. Therefore, in order to apply the caulking material to the outer peripheral surface side of the ventilation duct, it is considered necessary to perform construction from the outer peripheral surface side of the ventilation duct.

However, if there are many structures around the ventilation duct, there is a problem that construction from the outer peripheral surface side of the ventilation duct becomes difficult.

In addition, in double ceilings with upper and lower ceiling panels that are vertically spaced from each other in order to improve the soundproofing performance between the upper and lower floors, ventilation ducts are installed on both ceilings. It may be inserted through the face material. In this case, it is difficult to work from the outer peripheral surface side of the ventilation duct in order to close the gap between the inner peripheral surface of the upper ceiling panel and the ventilation duct because the lower ceiling panel is an obstacle.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a ventilation duct that is difficult to install from the outer peripheral surface side, and that the inner peripheral surface of the ceiling surface material or the inner peripheral surface of the wall surface material that forms the duct insertion hole. To provide a construction method and a ventilation structure of a ventilation duct capable of closing a gap formed between the ventilation duct and the ventilation duct.

The present invention relates to a method for constructing a ventilation duct in the ceiling or wall of a building, comprising a step of preparing a ventilation duct having an enlarged diameter portion that can be expanded in the radial direction of the duct; Duct positioning in which the position of the enlarged diameter portion overlaps the position of the first duct insertion hole in the axial direction of the duct in a state where the ventilation duct is inserted into the first duct insertion hole into which the ventilation duct can be inserted. and after the duct positioning step, the outer peripheral surface of the increased diameter portion of the ventilation duct is increased by increasing the diameter of the increased diameter portion of the ventilation duct radially outward from the flow path on the inner peripheral surface side of the ventilation duct. and a duct diameter expanding step of bringing the inner peripheral surface of the ceiling surface material or the inner peripheral surface of the wall surface material that defines the first duct insertion hole into contact and maintaining the contact state. I will provide a.

According to the ventilation duct construction method, the duct positioning step positions the enlarged diameter portion of the ventilation duct in the duct axial direction so as to overlap the position of the first duct insertion hole. Then, the diameter-enlarged portion thus positioned is enlarged in the duct radial direction by the duct diameter-enlarging step, thereby defining the outer peripheral surface of the enlarged-diameter portion of the ventilation duct and the ceiling defining the first duct insertion hole. The contact state is maintained while the inner peripheral surface of the face material or the inner peripheral surface of the wall surface material contacts. Therefore, by constructing from the channel on the inner peripheral surface side of the ventilation duct and increasing the diameter of the enlarged diameter portion, the inner peripheral surface of the ceiling surface material or the wall surface material forming the first duct insertion hole and a gap formed between the inner peripheral surface of the ventilation duct and the outer peripheral surface of the enlarged diameter portion of the ventilation duct.

The method for constructing the ventilation duct comprises: the ceiling surface member having the first duct insertion hole formed thereon; and a second duct insertion hole into which the ventilation duct can be inserted is formed and a space is formed between the ceiling surface member and the ceiling surface member. and a lower layer ceiling panel disposed below the ceiling panel with a gap between them, wherein the duct positioning step includes positioning the ventilation duct in the first duct insertion hole and in a state in which the ventilation duct is inserted into the second duct insertion hole and the tip of the ventilation duct is drawn downward from the ceiling panel, the tip is preferably fixed to the lower ceiling panel. .

When applying a ventilation duct to a double ceiling and trying to insulate the space between the upper ceiling material and the ventilation duct, the lower ceiling material becomes an obstacle, and the ventilation duct for the upper ceiling material becomes an obstacle. Construction from the outer peripheral side is restricted. According to the construction method of the ventilation duct, construction is performed from the flow path on the inner peripheral surface side of the ventilation duct without the lower layer ceiling surface material becoming an obstacle, and the enlarged diameter portion of the ventilation duct is expanded in diameter. Thus, the gap formed between the inner peripheral surface of the ceiling surface member forming the first duct insertion hole and the outer peripheral surface of the enlarged diameter portion of the ventilation duct can be closed. As a result, sound leakage through the gap is prevented, and the soundproofing effect of the double ceiling can further improve the soundproofing effect of the ceiling to which the ventilation duct is attached.

The method for constructing the ventilation duct includes the ceiling having a plate-shaped face material main body and a thick-walled part thicker than the face material main body, and having the first duct insertion hole formed in the thick-walled part. The step of preparing the face material or the wall material is further provided, and in the step of increasing the diameter of the ventilation duct, the outer peripheral surface of the enlarged diameter portion of the ventilation duct is replaced with the inner peripheral surface of the thick portion forming the first duct insertion hole. It is preferable that the

According to the construction method of the ventilation duct, the inner peripheral surface of the thick portion of the ceiling surface material or the wall surface material and the outer peripheral surface of the enlarged diameter portion of the ventilation duct are in close contact with each other. The length of contact of the outer peripheral surface of the enlarged diameter portion in the duct axial direction is greater than when the first duct insertion hole is formed in the plate-shaped face member main body, and sound leakage through the gap is more effectively prevented. can be prevented.

In the ventilation duct construction method, the inner peripheral surface of the thick-walled portion in which the first duct insertion hole is formed has a central portion in the duct axial direction that is radially outward of the end portions in the duct axial direction. It preferably has a curved shape so as to bulge out.

In the duct diameter expanding step, when part of the enlarged diameter portion of the ventilation duct in the duct axial direction is expanded outward in the duct radial direction, the outer peripheral surface of the enlarged diameter portion is such that the central portion in the duct axial direction is in the duct axial direction. It has a shape that bulges outward in the duct radial direction from the end portion. According to the construction method of the ventilation duct, the inner peripheral surface of the thick portion can be brought into close contact with the outer peripheral surface of the enlarged diameter portion corresponding to the curved shape of the outer peripheral surface of the enlarged diameter portion. As a result, the contact area between the outer peripheral surface of the enlarged diameter portion and the inner peripheral surface of the thick portion is increased and the adhesion between them is improved, thereby more effectively preventing sound leakage through the gap. can be done.

The present invention relates to a ventilation structure for a ceiling or wall of a building, which is a ceiling surface material formed with a ventilation duct for introducing or discharging gas and a first duct insertion hole into which the ventilation duct can be inserted. or a wall material, and diameter-expanding means for imparting a force to the ventilation duct to expand the diameter of the ventilation duct radially outward by receiving an operation from the channel on the inner peripheral surface side of the ventilation duct. , wherein the ventilation duct has an enlarged diameter portion that can be expanded in the duct radial direction at a position overlapping the position of the first duct insertion hole in the duct axial direction when the ventilation duct is inserted into the first duct insertion hole. and the outer peripheral surface of the enlarged diameter portion of the ventilation duct defines the first duct insertion hole by expanding the diameter of the enlarged diameter portion outward in the duct radial direction by a force from the diameter expanding means. The ventilation structure is in contact with the inner peripheral surface of the ceiling panel material or the inner peripheral surface of the wall panel material.

According to the ventilation structure, the expanded diameter portion of the ventilation duct is arranged at a position overlapping the position of the first duct insertion hole in the duct axial direction due to the radially outward force of the duct from the diameter expanding means. increases in diameter, and the outer peripheral surface of the enlarged diameter portion is in contact with the inner peripheral surface of the ceiling panel member or the inner peripheral surface of the wall panel member that defines the first duct insertion hole. Therefore, by operating and constructing the diameter-enlarging means from the channel on the inner peripheral surface side of the ventilation duct, the diameter-enlarged portion is enlarged in diameter, thereby forming the ceiling that forms the first duct insertion hole. A gap formed between the inner peripheral surface of the face material or the inner peripheral surface of the wall surface material and the enlarged diameter portion of the ventilation duct can be closed.

The ventilation structure includes a lower-layer ceiling panel which is formed with a second duct insertion hole into which the ventilation duct can be inserted and which is arranged below the ceiling panel with a space between it and the ceiling panel. Further, it is preferable that the ventilation duct has a tip portion fixed to the lower layer ceiling panel in a state of being inserted into the first duct insertion hole and the second duct insertion hole.

According to the ventilation structure, the diameter-enlarged portion of the ventilation duct is expanded by operating the diameter-enlarging means from the channel on the inner peripheral surface side of the ventilation duct without being obstructed by the lower-layer ceiling surface material. By doing so, it is possible to close the gap formed between the inner peripheral surface of the ceiling surface material forming the first duct insertion hole and the enlarged diameter portion of the ventilation duct. As a result, sound leakage through the gap is prevented, and the soundproofing effect of the double ceiling can further improve the soundproofing effect of the ceiling to which the ventilation duct is attached.

In the ventilation structure, the ceiling surface material or the wall surface material has a plate-like surface material body and a thick portion thicker than the surface material body, and the thick portion includes the first duct An insertion hole is preferably formed.

According to the ventilation structure, the inner peripheral surface of the thick-walled portion forming the first duct insertion hole and the outer peripheral surface of the enlarged-diameter portion of the ventilation duct can be brought into contact with each other. The contact length of the outer peripheral surface in the axial direction of the duct becomes larger than when the first duct insertion hole is formed in the plate-shaped face material main body, thereby more effectively preventing sound leakage through the gap. can be done.

In the ventilation structure, the inner peripheral surface of the thick portion in which the first duct insertion hole is formed bulges outward in the duct radial direction at the central portion in the duct axial direction from the end portions in the duct axial direction. It is preferred to have a curved shape so as to

When a portion of the enlarged diameter portion of the ventilation duct in the duct axial direction is expanded radially outward by the diameter expanding means, the outer peripheral surface of the enlarged diameter portion is such that the central portion in the duct axial direction is in the duct axial direction. It has a shape that bulges outward in the duct radial direction from the end portion. According to the ventilation structure, the inner peripheral surface of the thick portion can be in close contact with the outer peripheral surface of the enlarged diameter portion corresponding to the curved shape of the outer peripheral surface of the enlarged diameter portion. As a result, the contact area between the outer peripheral surface of the enlarged diameter portion and the inner peripheral surface of the thick portion is increased and the adhesion between them is improved, thereby more effectively preventing sound leakage through the gap. can be done.

In the ventilation structure, the diameter-expanding means includes a cylindrical portion that is formed in a cylindrical shape and that can be expanded in the radial direction of the duct, an operated portion that can be operated from the flow path of the ventilation duct, and the operated portion. It is preferable that the duct diameter expanding member has a converting portion that converts an operating force applied to the operating portion into a radially outward force of the duct and maintains the force.

According to the ventilation structure, in the diameter expanding means, the operated portion is operated from the flow path of the ventilation duct, and the converting portion converts the operating force into a radially outward force of the duct and maintains the force. By doing so, the cylindrical portion expands outward in the duct radial direction. Then, the diameter-enlarged tubular portion presses the inner peripheral surface of the enlarged-diameter portion of the ventilation duct radially outward in the channel of the ventilation duct, thereby expanding the diameter of the enlarged-diameter portion. As a result, the outer peripheral surface of the enlarged diameter portion comes into contact with the inner peripheral surface of the ceiling surface material or the inner peripheral surface of the wall surface member that defines the first duct insertion hole, and the outer peripheral surface of the enlarged diameter portion comes into contact with the inner peripheral surface of the wall surface material. State is maintained by the converter.

In the ventilation structure, the ceiling surface material or the wall surface material includes the surface material main body portion formed with a thick portion insertion hole into which the thick portion can be inserted, and an attachment attached to the surface material main body portion. and the attachment includes a tubular thick portion extending in the duct axial direction and having a greater thickness in the duct axial direction than the face member body portion and forming the first duct insertion hole; extending radially outward from the thick portion to allow insertion of the thick portion into the thick portion insertion hole; A hooking portion hooked on the face material main body portion so as to prevent it from coming off from the hole, and a state in which the hooking portion is hooked on the face material main body portion, the face member and the hooking portion Extending outward in the duct radial direction from the thick portion in a state spaced apart from the engaging portion so that the material main body portion can be clamped, the thick portion insertion hole is formed on the outer side of the thick portion in the duct radial direction. a flat plate portion having a closable shape.

According to the ventilation structure, the first duct insertion hole is formed by a member different from the face member main body. As a result, unlike the case where the first duct insertion hole is formed in the face material main body, the first duct insertion hole is not restricted by the thickness and shape of the face material main body, so that the first duct insertion hole can be brought into contact with the enlarged diameter portion. You can set it as appropriate. As a result, the degree of freedom in constructing the ceiling surface material or the wall surface material is improved, and a ventilation structure with high workability can be realized.

Therefore, according to the ventilation duct construction method and ventilation structure according to the present invention, even if it is difficult to construct the ventilation duct from the outer peripheral surface side, It is possible to close the gap formed between the inner peripheral surface of the ceiling surface material or the inner peripheral surface of the wall surface material that forms the duct insertion hole and the ventilation duct.

1 is a vertical sectional view of a ventilation structure according to a first embodiment of the invention; FIG. 1 is a vertical sectional view of a ventilation duct according to a first embodiment of the invention; FIG. 1 is a vertical cross-sectional view of a duct diameter-expanding member, which is diameter-expanding means according to the first embodiment of the present invention; B) is a diagram showing a state after diameter expansion of the duct diameter expansion member. 1 is a vertical sectional view of an attachment according to a first embodiment of the invention; FIG. It is a top view of the attachment concerning a 1st embodiment of the present invention. FIG. 4 is a vertical cross-sectional view of the ventilation structure according to the first embodiment of the present invention in which the ventilation duct is inserted into the first duct insertion hole and positioned, and is a view showing a duct positioning step; . FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6; FIG. 7 is a vertical cross-sectional view of the ventilation structure according to the first embodiment of the present invention in a state in which the diameter of the ventilation duct is expanded by the diameter expanding means after the state of FIG. 6 (duct positioning step); It is a figure which shows a diameter-expanding process. FIG. 10 is a vertical sectional view of the ventilation structure according to the second embodiment of the present invention in which the ventilation duct is inserted into the first duct insertion hole and positioned, and is a view showing a duct positioning step; . FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9; FIG. 10 is a vertical cross-sectional view of the ventilation structure according to the second embodiment of the present invention in a state in which the diameter of the ventilation duct is expanded by the diameter expanding means after the state of FIG. 9 (duct positioning step); It is a figure which shows a diameter-expanding process. FIG. 2 is a cross-sectional view taken along line XII-XII in FIG. 1; FIG. 4 is a vertical sectional view of a ventilation structure according to a modification of the invention;

A first preferred embodiment of the present invention will be described with reference to the drawings. 1 to 8 show a ventilation structure 1 according to a first embodiment of the invention. In this specification, the axial direction of the ventilation duct is defined as the duct axial direction, the radial direction orthogonal to the duct axial direction is defined as the duct radial direction, and the circumferential direction around the duct axis is defined as the duct circumferential direction. In addition, in this specification, the term "diameter" includes the diameter of a circle and also the length in the direction of increasing the area of other shapes. For example, in the case of a square shape, the length of the diagonal is also the "diameter" herein.

The ventilation structure 1 is a structure for ventilation of a room having a double structure ceiling (hereinafter referred to as "double ceiling 30") of a building. The ventilation structure 1 includes a ventilation duct 10 for introducing or discharging gas, a diameter expanding means 20 for applying force to the ventilation duct 10 for expanding the diameter of the ventilation duct 10, and a double ceiling 30. .

The ventilation duct 10 has a duct body portion 12, an enlarged diameter portion 14, and a mounting portion 50, as shown in FIG. The duct main body 12 is formed in a cylindrical shape by covering the surface of a flexible fiber material such as glass wool or polyester fiber with a flexible film material, and includes a plurality of annular metal rings arranged at intervals in the axial direction of the duct. It is the part that has the core. The expanded diameter portion 14 is provided continuously with the duct body portion 12, and is a portion formed in a cylindrical shape by covering the surface of a flexible fiber material with a flexible film material. It does not have an annular metal core. As a result, the enlarged diameter portion 14 can be enlarged in the radial direction of the duct. The expanded diameter portion 14 is arranged at a position overlapping the position of the first duct insertion hole H1 in the duct axial direction when the ventilation duct 10 is inserted into the first duct insertion hole H1 described later. Further, the outer peripheral surface 14 of the expanded diameter portion 14 is expanded in the duct radial direction by the diameter expanding means 20 described later at the central portion of the expanded diameter portion 14 in the duct axial direction, so that the central portion in the duct axial direction is the duct. It has a curved shape that bulges outward in the duct radial direction from the end in the axial direction. The attachment portion 50 is arranged on the tip end side of the ventilation duct 10 and is a portion attached to the lower layer ceiling panel 32 in order to fix the duct body portion 12 and the enlarged diameter portion 14 . Then, the ventilation duct 10 is configured such that the duct main body portion 12 and the enlarged diameter portion 14 are inserted into the first duct insertion hole H1 and the second duct insertion hole H2, which will be described later. 32 is fixed. Details of the mounting portion 50 will be described later.

The diameter expanding means 20 is means for applying a force to the ventilation duct 10 for expanding the diameter of the ventilation duct 10 outward in the duct radial direction by receiving an operation from the channel on the inner peripheral surface side of the ventilation duct 10. is. The diameter expanding means 20 comprises a duct diameter expanding member in this embodiment. As shown in FIG. 3, the duct diameter expanding member includes a tubular portion 22 formed in a tubular shape and capable of expanding in diameter in the duct radial direction, and an operated portion 24 capable of being operated from the flow path of the ventilation duct 10. and a converting portion 26 that converts an operating force applied to the operated portion 24 into a radially outward force of the duct and maintains the force. 3A and 3B are vertical sectional views passing through the center line of the cylindrical portion 22 of the duct diameter expanding member, FIG. 4 is a diagram showing a state after diameter expansion. FIG. The cylindrical portion 22 has an annular structure in which one end of a belt-like member overlaps the other end of the duct in the circumferential direction. It has a plurality of grooves 22m arranged at regular intervals in the portion (cylindrical inner peripheral portion 22b). An operated portion 24 is provided so as to straddle the inner peripheral portion 22b of the tubular portion 22 on the inner side in the duct radial direction of the portion (the outer peripheral portion 22a of the tubular portion) which is the outer side in the duct radial direction of the overlapping portion of the tubular portion 22. . The operated portion 24 is a bevel gear that has a rotating shaft parallel to the duct axial direction and can be operated by the driver Dr. That is, as shown in FIGS. 3A and 3B, the operated portion 24 is operated by twisting it with a driver Dr whose tip extends in the axial direction of the duct. The converting portion 26 is a bevel gear that is provided radially inward of the outer peripheral portion 22a of the cylindrical portion 22a, has a rotating shaft along the circumferential direction of the duct, and meshes with the teeth of the operated portion 24 on the base end side. The converting portion 26 has a worm gear whose tip side meshes with the plurality of grooves 22m of the cylindrical portion inner peripheral portion 22b. As the operated portion 24 rotates, the converting portion 26 feeds the cylindrical portion inner peripheral portion 22b in the duct circumferential direction with respect to the cylindrical portion outer peripheral portion 22a in a state where the worm gear and the groove 22m are engaged with each other. The state of (A) is shifted to the state of FIG. 3(B), and the diameter of the cylindrical portion 22 is enlarged. In other words, the converting portion 26 can convert the operating force on the operated portion 24, that is, the rotational force of the driver Dr, into a force directed outward in the duct radial direction of the cylindrical portion 22 and maintain the force. The duct diameter expanding member operates the operated portion 24 so that the diameter of the cylindrical portion 22 is smaller than the diameter of the duct main body portion 12, and extends from the tip of the ventilation duct 10 through the channel. It is inserted up to the enlarged diameter portion 14 .

As shown in FIG. 1, the double ceiling 30 is for double-structured ceilings for sound insulation between a room requiring a high degree of soundproofing and the upper floors of the room. The double ceiling 30 includes a ceiling panel 31 and a lower layer ceiling panel 32 arranged below the ceiling panel 31 with a space between the ceiling panel 31 and the ceiling panel 31. - 特許庁The ceiling panel member 31 is formed with a first duct insertion hole H1 into which the ventilation duct 10 can be inserted. A second duct insertion hole H2 into which the ventilation duct 10 can be inserted is formed in the lower layer ceiling panel 32 .

The ceiling panel 31 has a plate-shaped panel main body 36 and an attachment 40 attached to the panel main body 36 .

The face material body portion 36 is a plate-like member having a uniform thickness. A thick portion insertion hole HL into which a thick portion 38 to be described later can be inserted is formed in the face material body portion 36 . As shown in FIG. 7, the thick portion insertion hole HL has a square shape in plan view.

As shown in FIGS. 4 and 5, the attachment 40 is for increasing the thickness of the face material body 36 in the axial direction of the duct. This is for improving the adhesion with the inner peripheral surface of the ceiling panel 31 that defines the insertion hole H1. The attachment 40 includes a thick portion 38 , a hook portion 41 and a flat plate portion 42 .

The thick portion 38 is formed in a tubular shape extending in the duct axial direction, and is thicker in the duct axial direction than the face material body portion 36 . The thick portion 38 has a first duct insertion hole H1 inside in the duct radial direction. The inner peripheral surface 38n of the thick portion 38 that defines the first duct insertion hole H1 is curved such that the central portion in the duct axial direction protrudes radially outward from the end portions in the duct axial direction. have a shape.

The hooking portion 41 has a plate shape extending outward in the duct radial direction from the thick portion 38 . The hooking portion 41 has a rectangular shape with a slightly smaller diameter than the thick portion insertion hole HL in plan view. As a result, when the hooking portion 41 is arranged so as to be accommodated in the thick portion insertion hole HL in plan view (the position of the hooking portion 41 at this time is defined as the hooking portion insertion permitted position), When it is allowed to pass through the thick portion insertion hole HL and is arranged so as to overlap with the face member body portion 36 forming the thick portion insertion hole HL as shown in FIGS. The position is defined as a latching portion insertion restriction position), insertion into the thick portion insertion hole HL is restricted. Therefore, the latching portion 41 extending from the thick portion 38 allows the thick portion 38 to be inserted into the thick portion insertion hole HL, and allows the thick portion 38 inserted into the thick portion insertion hole HL to be inserted into the thick portion. It can be hooked to the face member body 36 so as to prevent it from slipping out of the insertion hole HL.

The flat plate portion 42 is separated from the hooking portion 41 so as to sandwich the face material body portion 36 between itself and the hooking portion 41 in a state in which the hooking portion 41 is hooked to the face material body portion 36 . , has a plate shape extending outward in the duct radial direction from the thick portion 38 . That is, as shown in FIG. 6 , the distance between the hooking portion 41 and the flat plate portion 42 in the duct axial direction is set to be substantially equal to the thickness of the face material body portion 36 . The flat plate portion 42 has a rectangular shape that is oriented 45 degrees different from the hook portion 41 in plan view. Further, as shown in FIG. 7, the flat plate portion 42 has a rectangular shape with a diameter larger than that of the thick portion insertion hole HL so as to cover the entire thick portion insertion hole HL in plan view. have That is, the flat plate portion 42 has a shape capable of closing the thick portion insertion hole HL on the outer side of the thick portion 38 in the duct radial direction.

As shown in FIG. 6, the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 is inserted into the first duct insertion hole H1 of the thick portion 38 and is in the state before the diameter expansion. The surface 38n is not in contact with the thick portion 38 except for the ends in the duct axial direction. On the other hand, the outer peripheral surface 14s of the enlarged diameter portion 14 is expanded outward in the duct radial direction by a force from the diameter expanding means 20 arranged in the flow path of the enlarged diameter portion 14. It can come into contact with the inner peripheral surface 38s of the thick portion 38 that defines the first duct insertion hole H1.

The lower layer ceiling panel 32 has a second duct insertion hole H2 into which the ventilation duct 10 can be inserted.

The mounting portion 50 of the ventilation duct 10 has a mounting plate 52 and a cover plate 54 .

The mounting plate 52 is positioned between the ceiling surface member 31 and the lower ceiling surface member 32 so that the ventilation duct 10 is inserted into the first duct insertion hole H1 and the second duct insertion hole H2 in a vertically extending posture. It is a plate-like member that is connected to the tip of the duct main body 12 and that is fixed in contact with the lower surface of the lower layer ceiling panel 32 . The mounting plate 52 is connected to the tip of the duct main body 12 while opening at least a portion of the duct main body 12 so as to ensure air permeability of the ventilation duct 10 . As shown in FIGS. 1 and 6, the mounting plate 52 includes a tubular portion (no numeral) fixed to the inner peripheral surface (no numeral) of the duct body portion 12 of the ventilation duct 10, and a lower end edge of the tubular portion. and a horizontal portion (not numbered) extending radially outward of the duct. Said horizontal part is connected at its inner part to the bottom surface of the tip of the ventilation duct 10 and attached at its outer part to the lower surface of the lower ceiling panel 32 . The horizontal portion is connected to the lower ceiling panel 32 by screws, for example. The horizontal portion of the mounting plate 52 can function as a handle for the ventilation duct 10 when pushing upward the ventilation duct 10 connected to the mounting plate 52, especially when positioning the enlarged diameter portion 14. By attaching the horizontal portion to the lower ceiling panel 32, the horizontal portion covers the gap between the outer peripheral surface of the duct main body 12 and the lower ceiling panel 32 forming the second duct insertion hole H2.

As shown in FIG. 1, the cover plate 54 is a plate-like member that is connected to the lower surface of the mounting plate 52 and covers the inside of the duct main body 12 of the ventilation duct 10 so that it cannot be seen from below. Like the mounting plate 52 , the cover plate 54 is formed to open at least a portion of the ventilation duct 10 so as to ensure the air permeability of the ventilation duct 10 . The cover plate 54 may be provided with a wind direction plate for changing the wind direction of the gas discharged or introduced through the ventilation duct 10 . Moreover, the cover plate 54 may be formed in a mesh shape.

The effects of the ventilation structure 1 according to the first embodiment will be described.

According to the ventilation structure 1, the expanded diameter portion 14 of the ventilation duct 10 is arranged at a position overlapping the position of the first duct insertion hole H1 in the duct axial direction due to the duct radially outward force from the diameter expanding means 20. is expanded, and the outer peripheral surface 14s of the enlarged diameter portion 14 is in contact with the inner peripheral surface 38n of the thick portion 38 of the attachment 40 that defines the first duct insertion hole H1 and that the ceiling panel 31 has. Therefore, by operating and constructing the diameter-enlarging means 20 from the channel on the inner peripheral surface side of the ventilation duct 10, the diameter-enlarging portion 14 is enlarged in diameter, thereby forming a thick wall forming the first duct insertion hole H1. A gap formed between the inner peripheral surface 38n of the portion 38 and the enlarged diameter portion 14 of the ventilation duct 10 can be closed.

Furthermore, according to the ventilation structure 1, the diameter expanding means 20 is operated from the channel on the inner peripheral surface side of the ventilation duct 10 without being obstructed by the lower layer ceiling surface material 32, and the expanded diameter portion 14 of the ventilation duct 10 is expanded. A gap formed between the inner peripheral surface 38n of the thick-walled portion 38 of the attachment 40 of the ceiling panel 31 and the enlarged-diameter portion 14 of the ventilation duct 10 by expanding the diameter to form the first duct insertion hole H1. can be blocked. As a result, sound leakage through the gap is prevented, and the soundproofing effect of the double ceiling can further improve the soundproofing effect of the ceiling to which the ventilation duct is attached.

Furthermore, according to the ventilation structure 1, the inner peripheral surface 38n of the thick portion 38 forming the first duct insertion hole H1 and the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 can contact each other. The contact length of the outer peripheral surface 14s of the diameter portion 14 in the duct axial direction is greater than in the case where the first duct insertion hole is formed in the plate-shaped surface material main body, and the sound leakage through the gap is more effectively prevented. can be effectively prevented.

As shown in FIG. 8, when the central portion of the enlarged diameter portion 14 of the ventilation duct 10 in the duct axial direction is expanded radially outward by the diameter expanding means 20, the outer peripheral surface 14s of the enlarged diameter portion 14 extends along the duct axis. The central portion in the direction of the duct bulges outward in the duct radial direction from the end portion in the axial direction of the duct and has a curved shape. According to the ventilation structure 1, the inner peripheral surface 38n of the thick portion 38 has a curved shape such that the central portion in the duct axial direction protrudes further outward in the duct radial direction than the end portions in the duct axial direction. Therefore, it is possible to adhere to the outer peripheral surface 14 s of the enlarged diameter portion 14 corresponding to the curved shape of the outer peripheral surface 14 s of the enlarged diameter portion 14 . As a result, the contact area between the outer peripheral surface 14s of the enlarged diameter portion 14 and the inner peripheral surface 38n of the thick portion 38 is increased and the adhesion between them is improved, thereby more effectively preventing sound leakage through the gap. can do.

Furthermore, according to the ventilation structure 1, in the diameter expanding means 20, the operated portion 24 is operated from the flow path of the ventilation duct 10, and the converting portion 26 converts the operating force into a radially outward force of the duct. is maintained, the cylindrical portion 22 expands outward in the duct radial direction. Then, the cylindrical portion 22 having the enlarged diameter presses the inner peripheral surface (no reference numeral) of the enlarged diameter portion 14 of the ventilation duct 10 in the channel of the ventilation duct 10 to expand the enlarged diameter portion 14 in the duct radial direction. Diameter. As a result, the outer peripheral surface 14s of the enlarged diameter portion 14 is brought into contact with the inner peripheral surface 38n of the thick portion 38 defining the first duct insertion hole H1, and the contact state of the outer peripheral surface 14s of the enlarged diameter portion 14 is the conversion portion. maintained by 26.

Furthermore, according to the ventilation structure 1, the first duct insertion hole H1 is formed by the attachment 40, which is a member different from the face member main body 36. As shown in FIG. As a result, unlike the case where the first duct insertion hole H1 is formed in the face material main body 36, the first duct insertion hole H1 can be formed in the enlarged diameter portion 14 without being restricted by the thickness and shape of the face material main body 36. It can be set to something suitable for contact. As a result, the degree of freedom in construction of the ceiling panel 31 is improved, and a ventilation structure with high workability can be realized.

Next, a construction method for the ventilation duct 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1, 6 and 8. FIG.

The construction method of the ventilation duct 10 is a construction method of a ventilation duct in the ceiling of a building. The construction method of the ventilation duct 10 includes a duct preparation process, a double ceiling preparation process, a duct positioning process, a duct diameter expansion process, and a covering process.

The duct preparation step is a step of preparing the ventilation duct 10 which does not yet have the mounting portion 50 and which has the duct body portion 12 and the enlarged diameter portion 14 whose diameter can be enlarged in the duct radial direction. In the duct preparation process, the ventilation duct 10 drawn into the room from the external ventilation opening of the building (not shown) is prepared before the ceiling panel is constructed. In the duct preparation process, the ventilation duct is prepared so that the leading end of the duct main body 12 of the ventilation duct 10 drawn in is located below the height position of the lower layer ceiling panel 32 to be attached by the attachment part 50 in the subsequent process. 10 is prepared.

The double ceiling preparation process is a process of preparing the double ceiling 30 that constitutes the ventilation structure 1 . The double ceiling preparation process includes an upper ceiling surface material preparation process and a lower ceiling surface material preparation process.

The upper layer ceiling panel member preparation step is a step of preparing the ceiling panel member 31 to be arranged in the upper layer of the two ceiling panel members that constitute the double ceiling 30 . In the upper layer ceiling panel preparation process, a plate-shaped panel main body 36 having a thick section insertion hole HL formed thereon, and a thick wall having a first duct insertion hole H1 formed to be thicker than the panel main body 36 are formed. an attachment 40 having a portion 38; In the upper ceiling panel preparation process, the panel main body 36 is arranged at a predetermined height position in the room, and the thick section insertion hole HL into which the thick section 38 of the attachment 40 can be inserted is formed in the panel main body 36 . formed in The thick portion insertion hole HL may be formed before or after the face material main body portion 36 is arranged. Then, the hooking portion 41 of the attachment 40 is arranged at the hooking portion insertion allowable position, and the thick portion 38 and the hooking portion 41 of the attachment 40 are inserted into the thick portion insertion hole HL. When the thick portion 38 and the hook portion 41 are inserted into the thick portion insertion hole HL, the attachment 40 is rotated in the duct circumferential direction. When the attachment 40 is rotated, as shown in FIG. 6, the hooking portion 41 is positioned at the hooking portion insertion restriction position and hooked to the face member body portion 36 . As a result, the thick portion 38 inserted into the thick portion insertion hole HL is prevented from coming off from the thick portion insertion hole HL.

In the upper layer ceiling panel preparation process, the panel main body 36 and the attachment 40 are arranged so that the ventilation duct 10 is inserted into the thick portion insertion hole HL and the first duct insertion hole H1. The ventilation duct 10 may be inserted into the thick portion insertion hole HL and the first duct insertion hole H1 at the time of construction of the face member main body 36 and the attachment 40, or after construction.

The lower layer ceiling panel preparation step is a step of preparing the lower layer ceiling panel member 32 to be arranged in the lower layer of the two ceiling panel members forming the double ceiling 30 . In the lower layer ceiling panel material preparation step, the lower layer ceiling panel member 32 is formed with a second duct insertion hole H2 into which the ventilation duct 10 can be inserted, and a space is provided between the lower layer ceiling panel member 31 and the ceiling panel member 31. placed on the bottom. The formation of the second duct insertion hole H2 may be performed before or after the lower layer ceiling panel 32 is arranged.

In the lower layer ceiling panel preparation step, the lower layer ceiling panel 32 is arranged so that the ventilation duct 10 is inserted into the second duct insertion hole H2. The ventilation duct 10 may be inserted into the second duct insertion hole H2 at the time of construction of the lower layer ceiling panel 32 or after construction.

The duct positioning step is a step of positioning the enlarged diameter portion 14 so as to overlap the position of the first duct insertion hole H1 in the axial direction of the duct when the ventilation duct 10 is inserted into the first duct insertion hole H1. . In the duct positioning step, the ventilation duct 10 is inserted into the first duct insertion hole H1 and the second duct insertion hole H2, and the tip of the ventilation duct 10 is pulled out below the ceiling panel 31. part is fixed to the lower layer ceiling panel material 32 . Specifically, in the duct positioning step, as shown in FIG. 6, the ventilation duct 10 is expanded in the duct axial direction, that is, in the height direction, while being inserted into the first duct insertion hole H1 and the second duct insertion hole H2. The position of the diameter portion 14 is positioned so as to overlap the position of the first duct insertion hole H1. Then, with the expanded diameter portion 14 positioned, the surplus portion of the ventilation duct 10 below the lower ceiling surface member 32 (the duct main body portion 12 indicated by the two-dot chain line in FIG. 6) is cut. be. Then, the cylindrical portion of the mounting plate 52 is connected to the tip portion of the ventilation duct 10, and the horizontal portion of the mounting plate 52 is fixed to the lower layer ceiling surface member 32, so that the position of the ventilation duct 10 is fixed. At this time, the mounting plate 52 may be operated as a handle for the ventilation duct 10 to realign the position of the ventilation duct 10 .

In the duct diameter expanding step, after the duct positioning step, the diameter of the enlarged diameter portion 14 of the ventilation duct 10 inserted in the first duct insertion hole H1 is enlarged so that the outer peripheral surface 14s of the enlarged diameter portion 14 and the thick portion 38 are formed. This is a step of closing the gap between the inner peripheral surface 38n of the . In the duct diameter enlarging step, the diameter of the duct diameter enlarging member included in the diameter enlarging means 20 is reduced, and the member is inserted from the distal end of the ventilation duct 10 into the diameter enlarging portion 14 through the channel. Then, as shown in FIG. 8, the operated portion 24 of the enlarged diameter portion 14 arranged at the position of the enlarged diameter portion 14 in the axial direction of the duct is moved by a driver Dr. is operated in the direction in which the diameter of the cylindrical portion 22 is enlarged. As a result, the duct diameter expanding member applies a force to the diameter expanding portion 14 for expanding the diameter of the diameter expanding portion 14 outward in the duct radial direction. The expanded diameter portion 14 is expanded radially outward in the duct by the operation of the expanded diameter portion 14 from within the flow path and the force from the diameter expanding means 20 disposed within the flow path. The outer peripheral surface 14s of the enlarged diameter portion 14 contacts the inner peripheral surface 38n of the thick portion 38 defining the first duct insertion hole H1 by expanding the diameter of the enlarged diameter portion 14 outward in the duct radial direction. At this time, the outer peripheral surface 14 of the enlarged diameter portion 14 has a curved shape in which the central portion in the duct axial direction bulges outward in the duct radial direction from the end portions in the duct axial direction. The peripheral surface 38n has a curved shape such that the central portion in the duct axial direction bulges outward in the duct radial direction from the end portions in the duct axial direction. Furthermore, since the converting portion 26 of the diameter expanding means 20 maintains the force obtained by converting the operating force outward in the radial direction of the cylindrical portion 22, the outer peripheral surface 14s of the enlarged diameter portion 14 and the inner circumference of the thick portion 38 The state of close contact with the surface 38n is maintained. That is, in the duct diameter enlarging step, the diameter of the enlarged diameter portion 14 of the ventilation duct 10 is enlarged outward in the duct radial direction from the flow path on the inner peripheral surface side by the diameter enlarging means 20, so that the enlarged diameter portion 14 of the ventilation duct 10 and the inner peripheral surface 38n of the thick portion 38 defining the first duct insertion hole H1 are brought into contact with each other and maintained in close contact. Thereby, the gap between the outer peripheral surface 14s of the enlarged diameter portion 14 and the inner peripheral surface 38n of the thick portion 38 is continuously closed.

The covering step is, as shown in FIG. 1, a step of covering the mounting plate 52 and the ventilation duct 10 with a cover plate 54 from below. By covering the mounting plate 52 and the ventilation duct 10 from the room side with the cover plate 54, the design of the ventilation structure 1 is improved.

The effects of the construction method of the ventilation duct 10 according to the first embodiment will be described.

According to the construction method of the ventilation duct, the position of the expanded diameter portion 14 of the ventilation duct 10 in the duct axial direction is positioned so as to overlap the position of the first duct insertion hole H1 in the duct positioning step. Then, the diameter of the enlarged diameter portion 14 thus positioned is enlarged in the duct diameter direction by the duct diameter expanding step, so that the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 and the ceiling surface that defines the first duct insertion hole H1. The inner peripheral surface of the material 31, that is, the inner peripheral surface 38n of the thick portion 38 is in contact with the inner peripheral surface 38n, and the contact state is maintained. Therefore, the inner peripheral surface 38n of the thick portion 38 forming the first duct insertion hole H1 and the ventilation duct 10 and the inner peripheral surface 38n of the thick-walled portion 38 forming the first duct insertion hole H1 and the enlarged-diameter portion 14 are expanded from the flow path on the inner peripheral surface side of the ventilation duct 10. The gap formed between the outer peripheral surface 14s of the enlarged diameter portion 14 of 10 and the outer peripheral surface 14s can be closed.

When the ventilation duct 10 is applied to the double ceiling 30 and sound insulation between the ceiling surface material 31 located in the upper layer and the ventilation duct 10 is intended, the lower ceiling surface material 32 becomes an obstacle and the ceiling surface of the upper layer becomes an obstacle. Construction from the outer peripheral surface side of the ventilation duct 10 to the material 31 is restricted. However, according to the ventilation duct construction method, construction is performed from the flow path on the inner peripheral surface side of the ventilation duct 10 without the lower layer ceiling surface material 32 becoming an obstacle, and the enlarged diameter portion 14 of the ventilation duct 10 is expanded. By doing so, the gap formed between the inner peripheral surface 38n of the thick portion 38 forming the first duct insertion hole H1 and the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 can be closed. As a result, sound leakage through the gap can be prevented, and the soundproofing effect of the double ceiling 30 can further improve the soundproofing effect of the ceiling to which the ventilation duct 10 is attached.

Furthermore, according to the construction method of the ventilation duct, the inner peripheral surface 38n of the thick portion 38 of the attachment 40 of the ceiling panel 31 and the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 are in close contact. Therefore, the contact length of the outer peripheral surface 14s of the enlarged diameter portion 14 in the duct axial direction becomes larger than in the case where the first duct insertion hole H1 is formed in the plate-shaped face material body portion 36, and the gap passes through. Sound leakage can be prevented more effectively.

In the duct diameter expanding step, when part of the enlarged diameter portion 14 of the ventilation duct 10 in the duct axial direction is expanded outward in the duct radial direction by the diameter expanding means 20, the outer peripheral surface 14s of the enlarged diameter portion 14 extends in the duct axial direction. The central portion has a shape that bulges outward in the duct radial direction from the end portions in the duct axial direction. However, according to the construction method of the ventilation duct, the inner peripheral surface 38n of the thick wall portion 38 closely contacts the outer peripheral surface 14s of the enlarged diameter portion 14 corresponding to the curved shape of the outer peripheral surface 14s of the enlarged diameter portion 14. be able to. As a result, the contact area between the outer peripheral surface 14s of the enlarged diameter portion 14 and the inner peripheral surface 38n of the thick portion 38 is increased and the adhesion between them is improved, thereby more effectively preventing sound leakage through the gap. can do.

The present invention is not limited to ceiling panels having attachments or thickened portions, and these may be omitted.

In order to explain this, a construction method of the ventilation structure 1A and the ventilation duct according to the second embodiment of the present invention will be explained with reference to FIGS. 9 to 12. FIG. In the following description, the same reference numerals are given to the same components as the components according to the above embodiment, and the description is omitted or simplified, and the different components are mainly described. do.

A ventilation structure 1A shown in FIG. 9 and the like includes a ventilation duct 10, a diameter expanding means 20, and a ceiling panel 31A.

The ceiling panel 31A is a plate-shaped member having a substantially uniform thickness. A first duct insertion hole H1a is formed in the ceiling panel 31A. The first duct insertion hole H1a is formed with a diameter larger than the diameter of the duct body portion 12 of the ventilation duct 10 and the diameter of the enlarged diameter portion 14 that is not enlarged. As shown in FIG. 10, the first duct insertion hole H1a has a circular shape in plan view.

In the ventilation duct 10 which is inserted into the first duct insertion hole H1a and in which the expanded diameter portion 14 is arranged so as to overlap the position of the first duct insertion hole H1a, the expanded diameter portion 14 is expanded in the duct radial direction by the diameter expanding means 20. 9 and 10, a gap is formed between the outer peripheral surface 14s of the enlarged diameter portion 14 and the inner peripheral surface 31An of the ceiling panel member 31A forming the first duct insertion hole H1a. is formed. On the other hand, when the enlarged diameter portion 14 is enlarged in the duct radial direction by the diameter enlarging means 20, the outer peripheral surface 14s of the enlarged diameter portion 14 and the first duct insertion hole H1a are formed as shown in FIGS. It is in a state of being in close contact with the inner peripheral surface 31An of the ceiling panel 31A.

The construction method of the ventilation duct 10 according to the second embodiment does not include the step of preparing the attachment 40 in the upper layer ceiling surface material preparation step in the construction method of the ventilation duct 10 according to the first embodiment, and the surface material main body. A step of forming the first duct insertion hole H1a in the portion 36 is included, and other steps include the same steps. It is assumed that the surface material main body 36 according to the first embodiment and the ceiling surface material 31A according to the second embodiment have the same configuration.

The effects of the construction method of the ventilation structure 1A and the ventilation duct 10 according to the second embodiment will be described. Note that the description of the same effects as those of the first embodiment will be omitted.

According to the ventilation structure 1A and the ventilation duct construction method according to the second embodiment, since the first duct insertion hole H1 is a circular hole, when the cross-sectional shape of the ventilation duct 10 is circular, the attachment The outer peripheral surface 14s of the expanded diameter portion 14 of the ventilation duct 10 comes into contact with the inner peripheral surface 31An of the ceiling panel 31A that defines the first duct insertion hole H1 without receiving assistance from 40 or the thick portion 38. and can adhere. Thereby, the gap formed between the outer peripheral surface 14s of the enlarged diameter portion 14 of the ventilation duct 10 and the inner peripheral surface 31An of the ceiling panel 31A can be closed.

According to the ventilation structure 1A and the construction method of the ventilation duct according to the second embodiment, since the attachment 40 and the thick portion 38 are not required to close the gap, the number of parts can be reduced.

The present invention is not limited to being applied to ceilings of buildings, but may be applied to walls.

In addition, the present invention is not limited to being applied to the paneling away from the room when the ceiling or wall is composed of a plurality of panelings, but is applied to the paneling closest to the room. There may be.

In order to explain this, a construction method of the ventilation structure 1B and the ventilation duct according to the modified example of the present invention will be explained based on FIG. In the following description, the same reference numerals are given to the same components as the components according to the above embodiment, and the description is omitted or simplified, and the different components are mainly described. do.

The ventilation structure 1B is a ventilation structure in the wall of a building, and is a structure for ventilation of a room having a double structure wall (hereinafter referred to as "double wall 30B"). The ventilation structure 1B comprises a ventilation duct 10B, an expansion means 20 and a double wall 30B.

The double wall 30B includes a wall surface member 31B and an outer wall surface member 32B arranged outside the wall surface member 31B (a position away from the room) with a space between the wall surface member 31B. The wall surface material 31B and the outer wall surface material 32B are installed in a room that requires a high level of soundproofing, and the wall is used to insulate the sound between the room and the next room or between the room and the outside. It is for making it a double structure. A first duct insertion hole H1 into which the ventilation duct 10B can be inserted is formed in the wall surface member 31B. A second duct insertion hole H2 into which the ventilation duct 10B can be inserted is formed in the outer wall surface member 32B.

The wall surface material 31B has a plate-shaped face material body portion 36B and an attachment 40B attached to the face material body portion 36B.

The face material body portion 36B is a plate-like member having a substantially uniform thickness. A thick portion insertion hole HL into which a later-described thick portion 38B can be inserted is formed in the face material body portion 36B. Although not shown, the thick portion insertion hole HL has a rectangular shape when viewed in the duct axial direction.

As in the first embodiment, the attachment 40B is for increasing the thickness of the face material body 36B in the axial direction of the duct, as shown in FIG. and the inner peripheral surface of the ceiling panel 31 that defines the first duct insertion hole H1. The attachment 40B includes a thick portion 38B, a hook portion 41, and a flat plate portion 42B.

The thick portion 38B is formed in a cylindrical shape extending in the duct axial direction and is thicker in the duct axial direction than the face material body portion 36 . The thick portion 38B is arranged to extend from the face material body portion 31 to the space between the face material body portion 31 and the outer wall surface member 32B when the attachment 40B is attached to the face material body portion 31B. there is The thick portion 38B has a first duct insertion hole H1 arranged in the space when attached to the face material body portion 31B.

The flat plate portion 42B has a plate shape extending outward in the duct radial direction from the room-side end portion of the thick portion 38B. As a result, when the face material body portion 36B is sandwiched between the hook portion 41 and the flat plate portion 42B, that is, when the attachment 40B is attached to the face material body portion 36B, the flat plate portion 42B can be seen from the room. The thick-walled portion insertion hole HL is hidden at the bottom, and only the face member main body portion 36B and the flat plate portion 42B are visible.

The ventilation duct 10B is inserted into the first duct insertion hole H1 and the second duct insertion hole H2 formed in the double wall 30 and arranged substantially horizontally. The ventilation duct 10B has a duct body portion 12 and an enlarged diameter portion 14, as in the above embodiment. The enlarged diameter portion 14 is provided at a portion of the ventilation duct 10B closest to the room. That is, the distal end portion of the ventilation duct 10B is the enlarged diameter portion 14 . The expanded diameter portion 14 of the ventilation duct 10B is positioned in the axial direction of the duct so as to overlap with the position of the first duct insertion hole H1 formed by the thick portion 38B of the attachment 40B. is fixed to the wall surface material 36 by closely contacting the thick portion 38B of the attachment 40B.

Next, a construction method of the ventilation duct 10B according to this modification will be described. Only characteristic parts will be explained.

The construction method of the ventilation duct 10 includes a duct preparation process, a double wall preparation process, a duct positioning process, and a duct diameter expansion process.

In the duct positioning process, the ventilation duct 10B is not fixed. Fixing of the ventilation duct 10B is performed in the duct diameter expanding process. The fixing of the ventilation duct 10B is achieved by bringing the outer peripheral surface of the expanded diameter portion 14 and the inner peripheral surface of the thick portion 38B forming the first duct insertion hole H1 into close contact with each other in the duct diameter expanding process. It is made possible by the frictional force between

The effects of the construction method of the ventilation structure 1B and the ventilation duct 10B according to this modification will be described. Note that the description of the same effects as those of the first embodiment will be omitted.

According to the construction method of the ventilation structure 1B and the ventilation duct 10B, the gap between the inner peripheral surface of the wall member 31B that defines the first duct insertion hole H1 and the enlarged diameter portion 14 of the ventilation duct 10B is enlarged. can be blocked. In order to obtain this effect, the enlarged diameter portion 14 of the ventilation duct 10B is not placed across the face material main body 36B in the duct axial direction. The enlarged diameter portion 14, which is the tip portion of the ventilation duct 10B, may be arranged so as to overlap the first duct insertion hole H1 arranged in the space between the outer wall surface member 32B. Therefore, when the wall surface material 31B is viewed from the room, the ventilation duct 10B can be seen at a position distant from the face material main body 36B, and the thick part insertion hole HL is hidden by the flat plate part 42B, thus providing a ventilation structure. Even if the ventilation structure 1B is provided on the wall surface material 31B close to the room, deterioration of the design of the ventilation structure 1B including the wall surface material 31B is suppressed.

Furthermore, according to the construction method of the ventilation structure 1B and the ventilation duct 10B, since the outer peripheral surface of the enlarged diameter portion 14 is in close contact with the inner peripheral surface of the thick portion 38B, the attachment 40B that is a part of the wall surface material 31B Since the thick portion 38B fixes the ventilation duct 10B, no attachment portion is required to attach the ventilation duct 10B to the wall surface member 31B. Therefore, it is possible to reduce the number of parts of the ventilation structure 1B.

Furthermore, although not shown, the present invention includes the following modifications.

The present invention is not limited to those in which the ventilation structure is applied to a double structure ceiling or wall, and may be applied to a ceiling or wall provided with a single ceiling panel or wall panel. Furthermore, it may be applied to a ceiling or wall provided with a plurality of ceiling surface materials or wall surface materials.

When the present invention is applied to a ceiling or wall provided with a plurality of ceiling or wall materials, the present invention is applied to all of the plurality of ceiling or wall materials through which ventilation ducts are inserted. may be For example, when a wall provided with two wall materials through which a ventilation duct is inserted is a partition wall between rooms, by applying the ventilation structure to both wall materials, the sound insulation between the rooms can be improved.

In the present invention, in the case where the ceiling surface material or wall surface material through which the ventilation duct is inserted has a thick portion forming the first duct insertion hole, the thick portion or thick portion forms the first duct insertion hole. The attachment is not limited to being attached to the face material main body, and may be integrally formed with the face material main body.

The present invention is not limited to one in which the diameter-enlarging means is inserted from the tip of the ventilation duct through the flow path to the diameter-enlarged part, and the diameter-enlarging means is integrated with the diameter-enlarged part of the ventilation duct. can be anything.

The present invention is not limited to the diameter-enlarging means having a cylindrical portion, an operated portion, and a conversion portion, and the diameter-expanding means may generate and maintain a radially outward force on the duct when operated. Just do it. For example, it may be a spiral spring or a C-shaped leaf spring with a small diameter and closed, and fixed with a clasp so as to maintain the closed state. In the case where the diameter expanding means is such a spring, the diameter expanding means can generate and maintain an outward force in the radial direction of the duct by the operation of removing the clasp with the tip of a screwdriver or the like. .

Furthermore, the present invention is not limited to the diameter-enlarging means having a substantially cylindrical shape as shown in FIG. It may be any shape as long as it corresponds to the shape of the part.

The present invention is not limited to a ventilation duct having a cylindrical shape as shown in FIG. For example, the invention may be that the ventilation duct is hollow prismatic.

Furthermore, the present invention is not limited to the ventilation duct having a duct main body portion and an enlarged diameter portion as shown in FIG. . In this case, in the duct positioning process, it is possible to relax the positioning accuracy when positioning the expanded diameter portion so as to overlap the position of the first duct insertion hole.

Reference Signs List 1, 1A, 1B ventilation structure 10, 10B ventilation duct 12 duct main body 14 enlarged diameter portion 14s outer peripheral surface of enlarged diameter portion 20 diameter expanding means (duct diameter expanding member)
22 Tubular part 22a Tubular part outer peripheral part 22b Tubular part inner peripheral part 22m Groove 24 Operated part 26 Converting part 30 Double ceiling 30B Double wall 31, 31A Ceiling surface material 31An Inner peripheral surface of ceiling surface material 31B Wall surface material 32 Lower ceiling Face material 32B Outer wall surface material 36, 36B Face material main body 38, 38B Thick part 38n, 38Bn Inner peripheral surface of thick part 40, 40B Attachment 41 Hook part 42 Flat plate part 50 Mounting part 52 Mounting plate 54 Cover plate H1 , H1a First duct insertion hole H2 Second duct insertion hole HL Thick part insertion hole Dr Driver

Claims (10)

A method for constructing a ventilation duct in the ceiling or wall of a building, comprising:
A step of preparing a ventilation duct having an expanded diameter portion that can be expanded in the duct radial direction;
In a state in which the ventilation duct is inserted into a first duct insertion hole formed in the ceiling panel or wall panel and into which the ventilation duct can be inserted, the position of the enlarged diameter portion in the duct axial direction is the position of the first duct insertion hole. a duct positioning step of positioning so as to overlap with the position;
After the duct positioning step, the diameter of the enlarged diameter portion of the ventilation duct is enlarged radially outward from the flow path on the inner peripheral surface side of the ventilation duct, so that the outer peripheral surface of the enlarged diameter portion of the ventilation duct and the first a duct diameter expanding step of bringing the inner peripheral surface of the ceiling surface material or the inner peripheral surface of the wall surface material, which defines the 1 duct insertion hole, into contact and maintaining the contact state;
Construction method of ventilation duct. A construction method for a ventilation duct according to claim 1,
The ceiling surface member having the first duct insertion hole formed thereon, and a second duct insertion hole into which the ventilation duct can be inserted are formed, and a space is provided between the ceiling surface member and the ceiling surface member. a step of providing a double ceiling comprising a lower ceiling panel located on the underside;
In the duct positioning step, in a state in which the ventilation duct is inserted into the first duct insertion hole and the second duct insertion hole and the leading end of the ventilation duct is drawn downward from the ceiling surface material, fixing the tip portion to the lower ceiling panel;
Construction method of ventilation duct. A construction method for a ventilation duct according to claim 1,
The ceiling panel or the wall panel is prepared, which has a plate-shaped panel main body and a thick-walled section that is thicker than the panel-shaped panel main body, and in which the first duct insertion hole is formed in the thick-walled section. further comprising a step of
In the duct diameter expanding step, the outer peripheral surface of the enlarged diameter portion of the ventilation duct is brought into close contact with the inner peripheral surface of the thick portion that forms the first duct insertion hole.
Construction method of ventilation duct. A construction method for a ventilation duct according to claim 3,
The inner peripheral surface of the thick portion in which the first duct insertion hole is formed is curved such that the central portion in the axial direction of the duct protrudes radially outward from the end portions in the axial direction of the duct. having a shape
Construction method of ventilation duct. A ventilation structure in the ceiling or wall of a building,
a ventilation duct allowing the introduction or evacuation of gas;
a ceiling panel or wall panel having a first duct insertion hole into which the ventilation duct can be inserted;
diameter expanding means for applying a force to the ventilation duct to expand the diameter of the ventilation duct outward in the duct radial direction by receiving an operation from the channel on the inner peripheral surface side of the ventilation duct;
with
The ventilation duct has an enlarged diameter portion that can be expanded in the duct radial direction at a position overlapping the position of the first duct insertion hole in the duct axial direction when the ventilation duct is inserted into the first duct insertion hole,
The outer peripheral surface of the enlarged-diameter portion of the ventilation duct is expanded radially outwardly of the duct by a force from the diameter-expanding means, whereby the ceiling defines the first duct insertion hole. In contact with the inner peripheral surface of the face material or the inner peripheral surface of the wall surface material,
ventilation structure. A ventilation structure according to claim 5,
Further comprising a lower layer ceiling panel member formed with a second duct insertion hole into which the ventilation duct can be inserted and arranged below the ceiling panel member with a space between it and the ceiling panel member,
The ventilation duct has a tip portion fixed to the lower ceiling panel in a state of being inserted into the first duct insertion hole and the second duct insertion hole,
ventilation structure. A ventilation structure according to claim 5,
The ceiling surface material or the wall surface material has a plate-like surface material main body and a thick portion thicker than the surface material main body,
The first duct insertion hole is formed in the thick portion,
ventilation structure. A ventilation structure according to claim 7,
The inner peripheral surface of the thick portion in which the first duct insertion hole is formed is curved such that the central portion in the axial direction of the duct protrudes radially outward from the end portions in the axial direction of the duct. having a shape
ventilation structure. The ventilation structure according to any one of claims 5 to 8,
The diameter-expanding means includes a cylindrical portion that is formed in a cylindrical shape and that can be expanded in the radial direction of the duct, an operated portion that can be operated from the flow path of the ventilation duct, and an operating force on the operated portion. into a radially outward force of the duct, and a converting portion that maintains the force.
ventilation structure. The ventilation structure according to claim 7 or claim 8,
The ceiling surface material or the wall surface material has the surface material main body formed with a thick portion insertion hole into which the thick portion can be inserted, and an attachment attached to the surface material main body. ,
The attachment is
a thick portion having the first duct insertion hole that is thicker in the duct axial direction than the face member main body;
extending radially outward from the thick portion to allow insertion of the thick portion into the thick portion insertion hole; a hooking portion hooked to the face member main body portion so as to be retained from the insertion hole;
In a state in which the hooking portion is hooked to the face material body portion, the hooking portion is separated from the hooking portion so as to sandwich the face material body portion with the hooking portion, and from the thick portion. a flat plate portion extending radially outward of the duct and having a shape capable of closing the thick portion insertion hole on the outer side of the thick portion in the duct radial direction;
comprising
ventilation structure.

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