Duct member and construction method of the same

Abstract

To provide a duct member which may block a ventilation portion between a duct and a housing material of a ceiling part disposed in a narrow space.SOLUTION: A duct member includes a foam heat insulation member 31 which has a first hole 35 into which a duct 14 for air conditioning is inserted, is formed by a foam material, and covers a periphery of the duct 14. The duct member further includes seal members (an upper surface side seal member 32 and a lower surface side seal member 33) which respectively have second holes 38 into which the duct 14 is inserted, are formed by plates made of elastic materials, and cover at least one of a lower surface and an upper surface of the foam heat insulation member 31. The seal members adhere to the duct 14 in a state that the duct 14 is inserted into the second hole 38 to block a gap between the duct 14 and the foam heat insulation material 31.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a duct member provided at a portion where an air-conditioning duct penetrates a ceiling, and a construction method of the duct member.

Background Art

[0002] Conventionally, as a highly airtight and highly heat-insulating house, there is one that employs an air-conditioning system called so-called whole-house air conditioning. In this air-conditioning system, as shown in FIG. 13, an air-conditioning duct 1 may be constructed so as to penetrate the ceiling portion 3 of a room 2 and extend in the vertical direction. The duct 1 shown in FIG. 13 vertically penetrates building materials 6 such as a gypsum board 4 and a heat insulating material 5 provided on the ceiling portion 3 of the room 2. The inside of the room 2 is cooled by the air-conditioning system. The attic 7 side is not cooled. The duct 1 shown in FIG. 13 is disposed in the vicinity of an outer wall 9 of a house 8 having a gentle ceiling gradient.

[0003] When adopting a structure in which the duct 1 penetrates the ceiling portion 3 as shown in FIG. 13, there is a possibility that condensation may occur at a portion where the duct 1 penetrates the ceiling portion 3 during the cooling operation of the whole-house air conditioning. The reason for the occurrence of condensation is mainly that cold air in the room 2 flows to the attic 7 side through a ventilation portion formed between the duct 1 and the building material 6, and the surface temperature of the duct 1 and the building material 6 becomes lower than the dew point determined by the ambient temperature and humidity. Further, condensation also occurs when high-humidity air flows into the ventilation portion from the attic 7 side and the dew point becomes high. When condensation occurs, there is a possibility that building materials 6 such as the gypsum board 4 on the ceiling and the heat insulating material 5 on the attic 7 side may be soiled. When the condensation increases, the lighting fixture may malfunction due to the condensed water, so it is strongly demanded to reduce the occurrence of condensation.

[0004] In order to meet such demands, conventionally, urethane foam has been sprayed by spray at a contact portion between the building material 6 such as the heat insulating material 5 and the gypsum board 4 on the ceiling and the duct 1, and a measure of closing the ventilation portion with the urethane foam has been taken. By closing the ventilation portion with the urethane foam, it is possible to prevent low-temperature air and high-humidity air from flowing into the ventilation portion.

[0005] By the way, as an air conditioning system capable of preventing condensation from occurring in ducts for air conditioning, there are, for example, those described in Patent Documents 1 to 5. In the air conditioning system shown in Patent Document 1, the temperature of the air flowing inside the duct is controlled to be within 5 [K (Kelvin)] of the temperature around the duct during cooling so that the duct surface does not fall below the dew point, suppressing the occurrence of condensation.

[0006] The air conditioning systems shown in Patent Document 2 and Patent Document 3 are configured to supply the air-conditioned indoor air to narrow spaces such as attics and between floors to achieve the same temperature and humidity state as inside the room. By performing air conditioning in this way, the surface temperature of the duct is prevented from falling below the dew point, suppressing the occurrence of condensation.

[0007] Patent Document 4 describes that the dew point temperature of the duct installation space is lowered by blowing air onto the surface of the duct (outer periphery) by a blower. Patent Document 5 describes that condensation is prevented by covering the entire area of the duct with a heat insulating material and further covering the outer surface of the heat insulating material with a resin film.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0009] Since the operation of spraying urethane foam into the ventilation space between the building material 6 of the ceiling portion 3 of Room 2 and the duct 1 to prevent cold air or high-humidity air from flowing into the ventilation space is an operation performed by an operator, there is a risk that the construction work may be completed without being able to confirm that a gap remains at the contact portion between the duct 1 and the building material 6 of the ceiling portion 3. If there is a remaining gap, the prevention of the inflow of cold air or high-humidity air may not be sufficient, and condensation may occur.

[0010] As shown in Fig. 13, when the duct 1 is arranged in the vicinity of the outer wall 9 of the house 8 with a gentle ceiling gradient, the operator cannot approach the portion where the duct 1 penetrates the ceiling portion 3. In such a case, it is difficult to perform the spraying operation of urethane foam because it cannot be seen by the operator or the operator's hand cannot reach, and moreover, since it is an operation performed in a place where it is difficult to confirm that there is no gap, the construction work may be completed without being able to confirm that a gap remains at the contact portion between the duct 1 and the building material 6 of the ceiling portion 3. Even in such a case, the prevention of the inflow of cold air or high-humidity air may not be sufficient, and condensation may occur. Therefore, when installing the duct, it is a technical issue to prevent the presence or absence of the ventilation space from changing due to the operator's work or the installation location of the duct, and to prevent air from flowing into the ventilation space with uniform quality.

[0011] In the air-conditioning system shown in Patent Document 1, since a configuration is adopted in which the temperature of the air flowing inside the duct is within 5 [K] with respect to the duct surrounding temperature during cooling so that a large temperature difference does not occur, it takes a certain amount of time until the air-conditioning becomes effective, and the comfort is impaired. The air conditioning systems shown in Patent Document 2 and Patent Document 3 are difficult to apply to a house that performs whole-house air conditioning. The reason for this is that in a house that performs whole-house air conditioning, ducts are often installed in narrow spaces such as attics and between floors. That is, even if it is desired to supply the conditioned indoor air to narrow spaces such as attics and between floors to make the temperature and humidity conditions in the attics and between floors the same as those in the room, the air supply is blocked by the ducts, and it is difficult to make the temperature and humidity conditions the same as those in the room because the supplied air does not reach everywhere.

[0012] The air conditioning system shown in Patent Document 4 is also difficult to apply to a house that performs whole-house air conditioning. The reason for this is that in whole-house air conditioning, the locations where the air conditioning ducts are installed are narrow spaces such as attics and between floors, so there are cases where the blowing air does not hit the duct surface. The duct shown in Patent Document 5 is provided with a heat insulating material and a resin film throughout the area, and since a large occupied space is required, it is difficult to arrange it in narrow spaces such as attics and between floors.

[0013] An object of the present invention is to provide a duct member capable of closing a ventilation portion between a duct arranged in a narrow space and a building material of a ceiling portion, and a construction method of the duct member.

Means for Solving the Problems

[0014] In order to achieve this object, the duct member according to the present invention has a first hole into which an air conditioning duct is inserted, a foamed heat insulating material formed of a foaming material and covering the periphery of the duct, and a second hole into which the duct is inserted, and is formed of a plate made of an elastic material and includes a seal member that covers at least one of the upper surface and the lower surface of the foamed heat insulating material. The seal member is in close contact with the duct in a state where the duct is inserted into the second hole, and closes a gap between the duct and the foamed heat insulating material.

[0015] In the present invention, in the duct member, the inner diameter of the second hole may be smaller than the outer diameter of the duct.

[0016] In the member for duct of the present invention, the opening portion of the second hole in the seal member may be elastically deformed and adhered along the outer surface of the duct in a state where the duct is inserted into the second hole.

[0017] In the member for duct of the present invention, the seal member may cover the upper surface and the lower surface of the foamed heat insulating material.

[0018] In the member for duct of the present invention, the foamed material may be a foamed plastic material.

[0019] In the member for duct of the present invention, the foamed plastic material may be expanded polystyrene.

[0020] In the member for duct of the present invention, the seal member covers the lower surface of the foamed heat insulating material, and the lower surface of the seal member on the lower surface side that covers the lower surface of the foamed heat insulating material has a third hole into which the duct is inserted, and a metal plate material that covers the seal member on the lower surface side from below may be adhered.

[0021] In the member for duct of the present invention, the metal plate material is formed larger than the seal member on the lower surface side, and adhesives may be provided at both end portions that protrude outward from the seal member on the lower surface side on the upper surface of the metal plate material.

[0022] The construction method of the member for duct according to the present invention is a construction method of the member for duct for attaching the member for duct to the ceiling portion in a room, and includes a step of fitting the foamed heat insulating material of the member for duct into a hole formed by the base material of the ceiling portion from below, a step of fixing the metal plate material to the base material surrounding the hole with the adhesive, a screw fixing step of fixing the metal plate material to the base material with a screw member penetrating in the vertical direction, and a step of inserting the duct into the first to third holes of the member for duct.

[0023] In the method for installing the duct member, the screw fixing step includes stacking a moisture-proof film and a gypsum board in this order so as to straddle the base material located around the metal plate material and the outer edge portion of the metal plate material, and fixing the metal plate material together with the base material by a screw member penetrating the gypsum board and the moisture-proof film in the vertical direction. Further, the method includes a step of attaching an airtight tape in a range from the lower surface of the gypsum board to the exposed lower surface of the metal plate material.

Effect of the Invention

[0024] According to the present invention, it is possible to provide a duct member capable of closing a ventilation portion between a duct arranged in a narrow space and a building material of a ceiling portion, and a method for installing the duct member.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0026] Hereinafter, an embodiment of a duct member and a construction method of the duct member according to the present invention will be described in detail with reference to FIGS. 1 to 11. The highly airtight and highly heat-insulating house 11 shown in FIG. 1 includes an air-conditioning duct 14 extending from the attic 12 to the inside of the room 13. FIG. 1 is a cross-sectional view seen from the ridge direction of the roof 15. Hereinafter, when indicating directions, the ridge direction orthogonal to the plane of FIG. 1 is referred to as the first direction, and the horizontal direction orthogonal to the first direction is referred to as the second direction.

[0027] The attic 12 is formed between the roof 15 with a relatively gentle slope and the ceiling portion 16 of the room 13. As shown in FIG. 2, the duct 14 is disposed in the attic 12 in the vicinity of the eaves beam 17 located at one end in the first direction. The break position in FIG. 2 is the position indicated by the line II-II in FIG. 1. This duct 14 is a so-called flexible duct, and is composed of a cylindrical body 21 through which air flows, a heat insulating material 22 made of glass wool covering the cylindrical body 21 (see FIG. 2), a plastic outer skin 23 covering the outer surface of the heat insulating material 22, and the like. Although not shown in detail, the cylindrical body 21 is formed to have flexibility by a cylindrical film made of a plastic material and a coiled reinforcing material for reinforcing this film.

[0028] The duct 14 shown in FIGS. 1 and 2 has a horizontal portion 14a extending in the second direction in the attic 12 and a vertical portion 14b extending in the vertical direction so as to be orthogonal to the ceiling portion 16. The vertical portion 14b penetrates the duct member 24 according to the present invention. The duct member 24 is passed through a hole 25 formed in the ceiling portion 16 and supported by the ceiling portion 16. As shown in FIG. 2, the hole 25 is formed into a quadrangle when viewed from the vertical direction by two first base materials 26 extending in the second direction in the ceiling portion 16 and two second base materials 27 (see FIG. 1) spanned between these first base materials 26.

[0029] The first base material 26 and the second base material 27 can be formed using a metal material or using wood. The first base material 26 and the second base material 27 are supported by joists 28 formed in a lattice shape so as to extend in the first direction and the second direction in the ceiling portion 16. The inner wall of the room 13 is formed of a gypsum board 29 including the ceiling portion 16. Although not shown in the figure, a heat insulating material is provided above the ceiling portion 16 in the same manner as in the prior art.

[0030] As shown in FIG. 3, the duct member 24 is formed by combining a plurality of members. The plurality of members constituting the duct member 24 are a foamed heat insulating material 31 drawn largest in FIG. 3, an upper surface side seal member 32 overlaid on the upper surface 31a of the foamed heat insulating material 31, a lower surface side seal member 33 overlaid on the lower surface 31b of the foamed heat insulating material 31, and a metal plate material 34 overlaid on the lower surface of the lower surface side seal member 33.

[0031] The foamed heat insulating material 31 is formed in a prismatic shape by a foaming material and has a first hole 35 formed of through holes opening to the upper surface 31a and the lower surface 31b. The opening shape of the first hole 35 is circular. The inner diameter of the first hole 35 is a diameter into which the duct 14 can be inserted in a fitted state. The foaming material forming the foamed heat insulating material 31 according to this embodiment is a foamed plastic material. Examples of the foamed plastic material forming the foamed heat insulating material 31 include expanded polystyrene. The outer shape of the foamed heat insulating material 31 is a shape that fits into the hole 25 of the ceiling portion 16 described above.

[0032] The sealing member 32 on the upper side and the sealing member 33 on the lower side are the same and are formed of a plate made of an elastic material. The elastic material forming the sealing member 32 on the upper side and the sealing member 33 on the lower side is a rubber material containing an elastomer, and a material that can be easily elastically deformed in a state of being formed into a thin plate shape is used. The shapes of the sealing members 32 and 33 on the upper side and the lower side according to this embodiment are quadrilaterals that are equal in size to the upper surface 31a or the lower surface 31b of the foamed heat insulating material 31 when viewed from the thickness direction, as shown in FIGS. 4(A) and 4(B). FIG. 4(A) is a plan view of the duct member 24, and FIG. 4(B) is a bottom view of the duct member 24.

[0033] As shown in FIG. 5, the sealing member 32 on the upper side is adhered to the upper surface 31a of the foamed heat insulating material 31 by an adhesive 36. The sealing member 33 on the lower side is adhered to the lower surface 31b of the foamed heat insulating material 31 by an adhesive 37. A second hole 38 having a circular opening shape is formed in the central portions of the sealing member 32 on the upper side and the sealing member 33 on the lower side. The second hole 38 is positioned on the same axis as the first hole 35 of the foamed heat insulating material 31. The inner diameter of the second hole 38 is smaller than the outer diameter of the duct 14 and the inner diameter of the first hole 35.

[0034] When the sealing member 32 on the upper side is adhered to the upper surface 31a of the foamed heat insulating material 31, the entire upper surface 31a of the foamed heat insulating material 31 is covered from above by the sealing member 32 on the upper side. In a state where the sealing member 32 on the upper side is adhered to the upper surface 31a of the foamed heat insulating material 31, the opening portion of the second hole 38 in the sealing member 32 on the upper side protrudes radially inward from the first hole 35 of the foamed heat insulating material 31 and substantially forms an inner flange 39.

[0035] By adhering the seal member 33 on the lower side to the lower surface 31b of the foamed heat insulating material 31, the entire lower surface 31b of the foamed heat insulating material 31 is covered from below by the seal member 33 on the lower side. In a state where the seal member 33 on the lower side is adhered to the lower surface 31b of the foamed heat insulating material 31, the opening portion of the second hole 38 in the seal member 33 on the lower side protrudes radially inward from the first hole 35 of the foamed heat insulating material 31 and substantially becomes the inner flange 40.

[0036] The metal plate material 34 has a function of fixing the assembly composed of the foamed heat insulating material 31 and the seal members 32 and 33 on the upper and lower sides to the ceiling portion 16, and a function of enhancing fire resistance to prevent the spread of fire from the room 13 side, and is formed in a rectangular shape larger than the seal member 33 on the lower side when viewed in the thickness direction. The metal plate material 34 according to this embodiment is formed of a steel plate.

[0037] As shown in FIG. 4(B), the metal plate material 34 according to this embodiment is formed in a rectangular shape when viewed in the thickness direction. More specifically, both end portions 34a and 34b in the longitudinal direction of the metal plate material 34 protrude outward from the seal member 33 on the lower side when viewed in the thickness direction. As shown in FIG. 5, an adhesive 41 is provided on the upper surfaces of both end portions 34a and 34b. This adhesive 41 can be constituted by, for example, a double-sided tape (not shown). A plurality of through holes 42 are formed in both end portions 34a and 34b of the metal plate material 34 described above.

[0038] In addition, a third hole 43 having a circular opening shape is formed in the central portion of the metal plate material 34. The third hole 43 is positioned on the same axis as the first and second holes 35 and 38. The inner diameter of the third hole 43 is an inner diameter into which the duct 14 can be inserted and can be the same as the inner diameter of the first hole 35. As shown in Fig. 5, this metal plate member 34 is adhered to the lower surface of the seal member 33 on the lower surface side by an adhesive 44. This adhesive 44 is different from the adhesive 41 provided at both end portions 34a and 34b of the metal plate member 34. When the metal plate member 34 is adhered to the seal member 33 on the lower surface side, the entire lower surface of the seal member 33 on the lower surface side is covered from below by the metal plate member 34.

[0039] Next, a construction method for attaching the duct member 24 configured as described above to the ceiling portion 16 will be described using the flowcharts of Figs. 6, 7, and 8. When attaching the duct member 24 to the ceiling portion 16, first, as shown in Fig. 6(A), a rectangular hole 25 is formed in the ceiling portion 16 by the first base material 26 and the second base material 27. Next, as shown in step S1 of the flowcharts shown in Figs. 6(B) and 7, the duct member 24 is inserted and fitted into the hole 25 in the ceiling portion 16 from below. The duct member 24 is inserted into the hole 25 with the seal member 32 on the upper surface side positioned upward. Before performing this operation, double-sided tapes (not shown) are attached to the upper surfaces of both end portions 34a and 34b of the metal plate member 34, and the release papers of the double-sided tapes are peeled off to expose the adhesive 41.

[0040] When the duct member 24 is inserted into the hole 25 from below, since the foam heat insulating material 31 is formed to fit into the hole 25, the foam heat insulating material 31 is in a state of closely adhering to the first and second base materials 26 and 27 without any gaps. Then, the metal plate material 34 is pressed against the first and second base materials 26 and 27 from below and fixed by the adhesive 41 (step S2). After assembling the duct member 24 to the ceiling portion 16 in this way, as shown in FIG. 6(C), the moisture-proof film 45 and the gypsum board 46 are overlapped in this order so as to straddle the first and second base materials 26 and 27 located around the metal plate material 34 and both end portions 34a and 34b (outer edge portions of the metal plate material 34) of the metal plate material 34, and in this state, these members are fixed to the first and second base materials 26 and 27 together with the metal plate material 34 by the screw member 47 (step S3). The screw member 47 passes through the gypsum board 46, the moisture-proof film 45, and the metal plate material 34 in the vertical direction and is passed through the second base material 27. This screwing operation can be performed by passing the screw member 47 through the through-hole 46a of the gypsum board 46, the through-hole 45a of the moisture-proof film 45, the through-hole 42 formed in the metal plate material 34, and the through-hole 27a of the second base material 27 (see FIG. 6(B)).

[0041] In order to fix the duct member 24 to the ceiling portion 16, it is only necessary to perform the screwing step of fixing to the first and second base materials 26 and 27 by the screw member 47 passing through the metal plate material 34 in the vertical direction. However, the screwing step according to this embodiment includes step S3 of fixing to the first and second base materials 26 and 27 together with the metal plate material 34 by the screw member 47 passing through the moisture-proof film 45 and the gypsum board 46 in the vertical direction. After performing the screwing operation in this way, as shown in FIG. 7(A), an airtight tape 48 is attached so as to cover the edge portions of the moisture-proof film 45 and the gypsum board 46 (step S4). The airtight tape 48 is attached in a range from the lower surface of the gypsum board 46 to the exposed lower surface of the metal plate material 34. In FIG. 7(A), a part of the ceiling portion 16 of the room 13 is drawn. In the room 13, the ceiling portion 16 is formed so as to extend also to the front side of the paper surface of FIG. 7(A).

[0042] Therefore, the moisture-proof film 45 and the gypsum board 46 are provided so as to extend not only within the ranges shown in FIGS. 6(C) and 7(A), but also to the front side of the paper surfaces of FIGS. 6(C) and 7(A) beyond this range. That is, the duct member 24 is exposed from a rectangular opening formed in the gypsum board 46 that covers the ceiling portion 16 from below. For this reason, in addition to being attached so as to airtightly seal the two sides that form the rectangular opening as shown in FIG. 7(A), the airtight tape 48 is also attached so as to airtightly seal the other two sides that form the rectangular opening.

[0043] After attaching the airtight tape 48, as shown in FIG. 7(B), the duct 14 is passed through the duct member 24 (step S5). This duct 14 is inserted into the first to third holes 35, 38, 43 of the duct member 24. Note that the duct 14 can be inserted into the duct member 24 from the attic 12 side or from the room 13 side. When inserting the duct 14 into the duct member 24 from the attic 12 side, first, the duct 14 is inserted into the second hole 38 of the seal member 32 on the upper surface side.

[0044] Since the inner diameter of the second hole 38 is smaller than the outer diameter of the duct 14, at this time, the seal member 32 on the upper surface side elastically deforms so that the inner diameter of the second hole 38 expands, and as the duct 14 enters the first hole 35 of the foamed heat insulating material 31, as shown in FIG. 9, the inner flange 39 of the seal member 32 on the upper surface side is pushed into the first hole 35 of the foamed heat insulating material 31. At this time, the outer skin 23 of the duct 14 is pushed by the inner flange 39 and slightly indented. The inner flange 39 elastically deforms and adheres along the outer skin (outer surface) of the duct 14 in a state where the duct 14 is inserted into the second hole 38, and airtightly seals the space between the duct 14 and the foamed heat insulating material 31. That is, the seal member 32 on the upper surface side adheres to the duct 14 in a state where the duct 14 is inserted into the second hole 38, and closes the gap between the duct 14 and the foamed heat insulating material 31.

[0045] When the duct 14 passes through the foamed heat insulating material 31 and reaches the second hole 38 of the seal member 33 on the lower surface side, the seal member 33 on the lower surface side elastically deforms so that the inner diameter of the second hole 38 expands, and the inner flange 40 elastically deforms so as to enter the third hole 43 of the metal plate material 34. At this time, the outer skin 23 of the duct 14 is pushed by the inner flange 40 and slightly indents. As shown in FIG. 10, the inner flange 40 of the seal member 33 on the lower surface side elastically deforms and adheres along the outer skin 23 (outer surface) of the duct 14 as the duct 14 advances downward through the third hole 43, and seals the space between the duct 14 airtightly. That is, the seal member 33 on the lower surface side adheres tightly to the duct 14 with the duct 14 inserted into the second hole 38, and closes the gap between the duct 14 and the foamed heat insulating material 31.

[0046] When the duct 14 is passed through the duct member 24, as shown in FIG. 11, the inner flange 39 of the seal member 32 on the upper surface side and the inner flange 40 of the seal member 33 on the lower surface side adhere tightly to the duct 14, so that it is difficult for a ventilation portion to be generated between the duct 14 and the building material (gypsum board 46) of the ceiling portion 16 or the building heat insulating material (not shown) provided on the ceiling portion 16. Therefore, conventionally, since the quality of the seal portion was ensured by the operator, there was a possibility that a ventilation portion remained, but by using the duct member 24 according to this embodiment, without depending on the work by the operator, the flow rate of the low-temperature air or the high-humidity air flowing along the outer surface of the duct 14 can be reduced to be close to 0. Since the flow rate of the low-temperature air or the high-humidity air flowing along the outer surface of the duct 14 can be reduced in this way, the occurrence of condensation can be prevented, and the building materials such as the gypsum board 46 and the heat insulating material of the ceiling portion 16 can be prevented from being soiled.

[0047] In addition, the duct member 24 according to this embodiment can be adopted by either a construction method of inserting the duct 14 from above or a construction method of inserting the duct 14 from below. For this reason, according to this embodiment, there is no restriction on the direction in which the duct 14 is passed, and a duct member 24 that is easy to construct can be provided. When inserting the duct 14 into the duct member 24 from below, the inner flange 39 of the upper surface side seal member 32 protrudes above the foamed heat insulating material 31 and adheres to the outer surface of the duct 14 to seal the space between the duct 14 and the foamed heat insulating material 31. Further, in this case, the inner flange 40 of the lower surface side seal member 33 is pushed into the first hole 35 of the foamed heat insulating material 31 and sandwiched between the duct 14 and the foamed heat insulating material 31 to seal this portion.

[0048] In the above-described embodiment, an example was shown in which the upper surface side seal member 32 is adhered to the upper surface 31a of the foamed heat insulating material 31 and the lower surface side seal member 33 is adhered to the lower surface 31b. However, the duct member according to the present invention can block the ventilation portion even if it includes only one of the upper surface side seal member 32 and the lower surface side seal member 33.

[0049] In the above-described embodiment, an example in which one duct penetrates the ceiling portion was shown. However, even when a plurality of ducts penetrate the ceiling portion as shown in FIG. 12, the duct member according to the present invention can be applied. In FIG. 12, members that are the same as or equivalent to those described with reference to FIGS. 1 to 11 are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0050] In the attic 12 of the highly airtight and highly heat-insulated house 11 shown in FIG. 12, three ducts 14 and three duct members 24 are arranged. FIG. 12 is drawn by breaking a part of the roof 15 of the highly airtight and highly heat-insulated house 11. In FIG. 12, reference numeral 51 denotes a sheathing board of the roof 15, 52 denotes a main house supporting the roof 15, 53 denotes a roof rafter, 54 denotes an eaves beam, 55 denotes a through column, 56 denotes a purlin, and 57 denotes a ceiling beam. The three ducts 14 are each formed in the same shape having a horizontal portion 14a and a vertical portion 14b, are positioned at the same position in the second direction, and are arranged in the first direction in a state of approaching each other. The vertical portions 14b of these ducts 14 are each passed through a duct member 24.

[0051] The three duct members 24 shown in FIG. 12 are arranged in a first direction so that the foamed heat insulating materials 31 contact each other and are attached to the ceiling portion 16. As shown in FIG. 12, when a plurality of ducts 14 are provided, when spraying and sealing urethane foam to block the ventilation portion between the duct 14 and the building material of the ceiling portion 16, it is not possible to spray urethane foam onto the duct 14 in a narrow and deep place in the attic 12, nor can the working result be confirmed. However, by using the duct member 24 according to the present invention, even when there are a plurality of ducts 14, it is possible to prevent the occurrence of condensation due to the formation of a ventilation portion in a narrow and deep place in the attic 12.

[0052] The inner diameter of the second hole 38 of the upper seal member 32 and the lower seal member 33 according to this embodiment is smaller than the outer diameter of the duct 14. For this reason, the opening edge portions of the second holes 38 in the upper seal member 32 and the lower seal member 33 are pressed against the duct 14, so that the gap between the duct 14 and the foamed heat insulating material 31 can be blocked.

[0053] The opening portions of the second holes 38 in the upper seal member 32 and the lower seal member 33 according to this embodiment are elastically deformed and adhered along the outer surface of the duct 14 in a state where the duct 14 is inserted into the second hole 38. For this reason, the outer surface of the duct 14 and the upper surface or the lower surface of the upper seal member 32 are in surface contact. Also, the outer surface of the duct 14 and the upper surface or the lower surface of the lower seal member 33 are in surface contact. For this reason, when sealing between the duct 14 and the foamed heat insulating material 31, the sealing performance is improved.

[0054] The foamed plastic material forming the foamed heat insulating material 31 according to this embodiment is polystyrene foam. For this reason, the foamed heat insulating material 31 can be accurately formed, so that it can be fitted into the hole 25 of the ceiling portion 16 without a gap, and it is possible to prevent the formation of a ventilation portion between the ceiling portion 16 and the foamed heat insulating material 31.

[0055] In this embodiment, on the lower surface of the seal member 33 on the lower surface side that covers the lower surface 31b of the foamed heat insulating material 31, there is a third hole 43 into which the duct 14 is inserted, and a metal plate material 34 that covers the seal member 33 on the lower surface side from below is adhered. Therefore, since the metal plate material 34 suppresses the spread of fire from the room, a duct member 24 with high fire resistance can be provided.

[0056] The metal plate material 34 according to this embodiment is formed larger than the seal member 33 on the lower surface side. An adhesive 41 is provided on a portion of the upper surface of the metal plate material 34 that protrudes outward from the seal member 33 on the lower surface side. Therefore, since the metal plate material 34 can be attached and fixed to the lower surface of the ceiling portion 16 by the adhesive 41, the duct member 24 can be attached from the room 13 side. That is, compared with the case of performing the attachment work of the duct member 24 in the narrow attic 12, the foamed heat insulating material 31 does not get in the way during attachment, so the attachment work is easy.

[0057] In the construction method of the duct member 24 according to this embodiment, first, the foamed heat insulating material 31 of the duct member 24 is fitted from below into the hole 25 formed by the first and second base materials 26, 27 of the ceiling portion 16, and the metal plate material 34 is fixed to the first and second base materials 26, 27 surrounding the hole 25 by the adhesive 41. Then, a moisture-proof film 45 and a gypsum board 46 are stacked in this order so as to straddle the first and second base materials 26, 27 located around the metal plate material 34 and the outer edge portion of the metal plate material 34, and the gypsum board 46, the moisture-proof film 45, and the metal plate material 34 are fixed to the first and second base materials 26, 27 by a screw member 47 that penetrates in the vertical direction. After that, an airtight tape 48 is attached to the range from the lower surface of the gypsum board 46 to the exposed lower surface of the metal plate material 34, and the duct 14 is inserted into the first to third holes 35, 38, 43. Therefore, since all the construction steps for attaching the duct member 24 can be performed from the indoor side, even if there is only one operator, the attachment work can be completed in a short time.

Explanation of Reference Numerals

[0058] 14... Duct, 31... Foam heat insulation material, 31a... Upper surface, 31b... Lower surface, 32... Seal member on the upper surface side, 33... Seal member on the lower surface side, 34... Metal plate material, 35... First hole, 38... Second hole, 39, 40... Inner flange (opening part), 41... Adhesive, 43... Third hole, S1... Step of fitting the foam heat insulation material into the hole from below, S2... Step of fixing the metal plate material to the base material with an adhesive, S3... Step of fixing the gypsum board, moisture-proof film and metal plate material to the base material with screw members, S4... Step of attaching an airtight tape, S5... Step of inserting the duct into the first to third holes.

Claims

1. A foamed heat insulating material having a first hole into which a duct for air conditioning is inserted, formed of a foaming material and covering the periphery of the duct, and a seal member having a second hole into which the duct is inserted, formed of a plate made of an elastic material and covering at least one of the upper surface and the lower surface of the foamed heat insulating material, wherein the seal member is in close contact with the duct in a state where the duct is inserted into the second hole, and closes a gap between the duct and the foamed heat insulating material. A duct member characterized by this.

2. In the duct member according to Claim 1, A duct member characterized in that the inner diameter of the second hole is smaller than the outer diameter of the duct.

3. In the duct member according to Claim 2, An opening portion of the second hole in the seal member is elastically deformed and closely adheres along the outer surface of the duct in a state where the duct is inserted into the second hole. A duct member characterized by this.

4. In the duct member according to Claim 1, A duct member characterized in that the seal member covers the upper surface and the lower surface of the foamed heat insulating material.

5. In the duct member according to Claim 1, A duct member characterized in that the foaming material is a foamed plastic material.

6. In the duct member according to Claim 5, A duct member characterized in that the foamed plastic material is polystyrene foam.

7. In the duct member according to Claim 1, the seal member covers the lower surface of the foamed heat insulating material, A duct member characterized in that a third hole into which the duct is inserted is provided in the lower surface of the seal member on the lower surface side covering the lower surface of the foamed heat insulating material, and a metal plate material covering the seal member on the lower surface side from below is adhered.

8. In the duct member according to Claim 7, the metal plate material is formed larger than the seal member on the lower surface side, A duct member characterized in that adhesives are provided at both end portions protruding outward from the seal member on the lower surface side on the upper surface of the metal plate material.

9. A construction method of a duct member for attaching the duct member according to Claim 8 to the ceiling portion of a room, a step of fitting the foamed heat insulating material of the duct member into a hole formed by a base material of the ceiling portion from below, A step of fixing the metal plate material to the base material surrounding the hole with the adhesive; A screw fixing step of fixing the metal plate material to the base material with a screw member penetrating the metal plate material in the vertical direction; A method for installing a duct member, which is carried out by inserting the duct into the first to third holes of the duct member.

10. In the method for installing a duct member according to Claim 9, The screw fixing step is including a step of overlapping a moisture-proof film and a gypsum board in this order so as to straddle the base material located around the metal plate material and the outer edge portion of the metal plate material, and fixing the gypsum board and the moisture-proof film together with the metal plate material to the base material with the screw member penetrating the gypsum board and the moisture-proof film in the vertical direction; further including a step of attaching an airtight tape to a range from the lower surface of the gypsum board to the exposed lower surface of the metal plate material; A method for installing a duct member, characterized by including the above.

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