Duct structure on roof

Abstract

To provide a duct structure on a roof allowing a construction period of an architectural structure to be shortened.SOLUTION: A duct structure 100 on a roof is provided with a duct body 20 having a lower opening 21 opening at a lower part and a side opening 22 opening at a side part. For the duct body 20, the lower opening 22 faces a through hole 11 and the side opening 22 is disposed on a slab 10 on the roof so as to be connected to a duct member 50 on the roof installed on the roof, and the through hole 11 and the duct member 50 on the roof are in communication with each other through the duct body 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rooftop duct structure. [Background technology]

[0002] Patent Document 1 discloses a concrete structure, known as a pigeon coop, constructed to prevent rainwater from seeping into the interior of a building through through holes provided in the roof slab to allow ducts and other piping to be routed outdoors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-284414 Summary of the Invention [Problem to be solved by the invention]

[0004] When constructing a concrete pigeon coop as described in Patent Document 1 on a roof slab, many work processes are required, such as arranging rebar, setting formwork, pouring concrete, curing the concrete, and removing the formwork, so it takes time to complete the construction. Furthermore, work such as installing piping in the attic on the floor below cannot begin until construction of the pigeon coop is complete, which can result in a longer construction period for the building.

[0005] An object of the present invention is to provide a rooftop duct structure that can shorten the construction period of a building. [Means for solving the problem]

[0006] The present invention is a rooftop duct structure that connects the indoor side and the outdoor side through a through hole provided in the rooftop slab, and comprises a duct body having a downward opening that opens downward and a side opening that opens to the side, the duct body is positioned on the rooftop slab so that the downward opening faces the through hole and the side opening is connected to a rooftop duct member installed on the roof, and the through hole and the rooftop duct member are connected through the internal space of the duct body. Effect of the Invention

[0007] According to the present invention, the construction period of a building can be shortened. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a rooftop duct structure according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] 2 is an enlarged view showing a portion indicated by an arrow B in FIG. 1. [Figure 4] 2 is an enlarged view showing a portion indicated by an arrow C in FIG. 1. [Diagram 5] FIG. 2 is an enlarged view of a modified example of the rooftop duct structure according to the first embodiment of the present invention. [Figure 6] FIG. 1 is a diagram for explaining an example of a conventional rooftop duct arrangement. [Figure 7] FIG. 2 is a diagram for explaining an example of the arrangement of a rooftop duct structure according to the first embodiment of the present invention. [Figure 8] FIG. 4 is a cross-sectional view of a rooftop duct structure according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line DD in FIG. [Figure 10] 9 is an enlarged view showing a portion indicated by an arrow E in FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a rooftop duct structure according to an embodiment of the present invention will be described with reference to the drawings.

[0010] First Embodiment A rooftop duct structure 100 according to a first embodiment will be described with reference to Figs. 1 to 4. As shown in Fig. 1, the rooftop duct structure 100 is a structure for preventing rainwater from entering the room through through holes 11 provided in a rooftop slab 10 for discharging indoor air to the outside or for supplying air from the outside to the inside, and is used in place of a rainproof structure such as a reinforced concrete structure called a pigeon coop that has conventionally been formed on the rooftop slab 10.

[0011] Fig. 1 is a cross-sectional view of the rooftop duct structure 100, and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Also, Figs. 3 and 4 are enlarged views of the portions indicated by arrows B and C in Fig. 1, respectively.

[0012] The rooftop duct structure 100 connects the indoor side with the outdoor side through a through hole 11 provided in the rooftop slab 10, and is equipped with a duct body 20 having a downward opening 21 that opens downward and a side opening 22 that opens on the side.

[0013] 1, the duct body 20 is placed on the roof slab 10 so that the lower opening 21 faces the through hole 11 provided in the roof slab 10 and the side opening 22 is connected to the roof duct member 50 installed on the roof. In other words, the through hole 11 and the roof duct member 50 communicate with each other through the internal space of the duct body 20. Note that the fluid flowing through the roof duct structure 100 is not limited to simple air, but may include steam, smoke, etc., or may be a fluid in a pressurized or depressurized state.

[0014] The duct body 20 is a hollow structure formed into a substantially rectangular parallelepiped shape by aluminum or aluminum alloy plate materials, and each side and apex that is the joint of the plate materials are welded to ensure airtightness. The material of the duct body 20 is not limited to aluminum or aluminum alloy, but is preferably made of a weldable metal from the viewpoint of ensuring airtightness. For example, when the pressure of the fluid flowing through the duct body 20 is relatively high, negative, or fluctuating, a galvanized steel plate or stainless steel plate with high rigidity may be used to suppress deformation of the duct body 20. On the other hand, from the viewpoint of installation workability, the material of the duct body 20 is preferably aluminum or an aluminum alloy that can reduce the weight of the duct body 20, and from the viewpoint of processability, it is preferable that the material of the duct body 20 is aluminum or an aluminum alloy that can be relatively easily processed.

[0015] The duct body 20 has a lower opening 21 that opens downward and has a larger opening area than the through hole 11, and a side opening 22 that opens on one side and to which the rooftop duct member 50 is attached, and the external size (three side dimensions) of the duct body 20 is appropriately set according to the size of the side opening 22, i.e., the size of the flow path cross-sectional area of ​​the rooftop duct member 50, and the size of the lower opening 21, i.e., the size of the flow path cross-sectional area of ​​the through hole 11. The size of the flow path cross-sectional area of ​​the rooftop duct member 50 and the size of the flow path cross-sectional area of ​​the through hole 11 are set in advance based on the required maximum exhaust flow rate and maximum supply flow rate of air.

[0016] As shown in Fig. 3, the duct body 20 is installed on the upper surface of the rising portion 12 of the roof slab 10, which rises around the through hole 11, via a lower edge portion 27 formed at the lower end. In other words, the duct body 20 is attached to the roof slab 10 so as to cover the open end of the through hole 11. The opening surrounded by the lower edge portion 27 becomes the lower opening 21.

[0017] The lower edge portion 27 is formed by further bending the tip of the first bent portion 26 (bent portion) formed by bending the lower portion of the side surface 25 of the duct body 20 inwardly around the entire circumference, so that the tip is downwardly approximately parallel to the side surface 25.

[0018] Meanwhile, one side of the angle iron 14 is fixed to the upper surface of the rising portion 12 via an anchor bolt (not shown) attached to the rising portion 12 along a fixing direction line F1. The lower end edge 27 is fixed to the other side of the angle iron 14 fixed to the rising portion 12 in this manner along a fixing direction line F2 with a fastening member such as a screw (not shown), whereby the duct body 20 is attached to the upper surface of the rising portion 12.

[0019] 2 and 3, a first gap G1 (gap) that can be filled with a sealant is formed around the entire periphery between the first bent portion 26 of the duct body 20 fixed to the rising portion 12 in this manner and the upper surface of the rising portion 12. Note that in FIG. 2, the sealant is omitted from the illustration in order to clearly show the gap to be filled with the sealant.

[0020] In the first gap G1 between the first bent portion 26 and the upper surface of the rising portion 12, the first back-up material 41a is first filled, and then the first seal material 42a is filled by caulking. Then, after the first seal material 42a has dried to a certain extent, the second back-up material 41b is filled, and then the second seal material 42b is filled by caulking.

[0021] In this way, by providing a double seal around the entire circumference between the duct body 20 and the rising portion 12, it is possible to reliably prevent rainwater from entering through the gap between the duct body 20 and the rising portion 12. In addition, because the duct body 20 is installed on the upper surface of the rising portion 12, rainwater that has accumulated on the roof slab 10 is less likely to reach the gap between the duct body 20 and the rising portion 12. The surface of the roof slab 10, including the rising portion 12, has been previously treated with a waterproofing coating or the like.

[0022] The rooftop duct member 50 is a tubular member formed of a galvanized steel plate, and has a cylindrical portion 51 having a substantially rectangular cross-sectional shape and a flange portion 52 formed at the end of the cylindrical portion 51. The other end of the cylindrical portion 51 is directly or indirectly connected to a blower (not shown) installed on the rooftop slab 10. For example, when the blower is installed indoors, the other end of the rooftop duct member 50 may be a duct hood that is open vertically downward without being connected to the blower. The material of the rooftop duct member 50 is not limited to galvanized steel, and may be stainless steel, or may be aluminum or an aluminum alloy like the duct body 20.

[0023] The flange portion 52 of the rooftop duct member 50 is formed by bending the end of the tubular portion 51 toward the inside of the tubular portion 51, as shown in Figure 4, and the rooftop duct member 50 is attached to the duct body 20 via the flange portion 52.

[0024] On the other hand, on the first side surface 25a of the side surfaces 25 of the duct body 20 where the side opening 22 is provided, a mounting portion 29 to which a flange portion 52 of the rooftop duct member 50 is attached is formed in an annular shape, as shown in Fig. 4. The mounting portion 29 is a portion formed by further bending a tip portion of a second bent portion 28 formed by bending the inner edge of the opening formed on the first side surface 25a toward the inside of the duct body 20 over the entire circumference, so that the tip portion is substantially parallel to the first side surface 25a. The opening surrounded by the mounting portion 29 becomes the above-mentioned side opening 22.

[0025] In this manner, the flange portion 52 is fixed to the mounting portion 29 formed on the first side surface 25a of the duct body 20 by the fastening member 60, so that the rooftop duct member 50 is attached to the duct body 20.

[0026] In addition, between the tubular portion 51 of the rooftop duct member 50 fixed to the duct body 20 and the second bent portion 28 provided on the first side surface 25a, a second annular gap G2 into which a sealing material can be filled is formed, as shown in Figures 2 and 4.

[0027] In the second gap G2, the first back-up material 43a is first filled, and then the first seal material 44a is filled by caulking. After the first seal material 44a has dried to a certain extent, the second back-up material 43b is filled, and then the second seal material 44b is filled by caulking.

[0028] In this way, by providing a double seal around the entire circumference between the first side 25a of the duct body 20 and the rooftop duct member 50, it is possible to reliably prevent rainwater from entering through the gap between the duct body 20 and the rooftop duct member 50.

[0029] 5, the flange portion 53 of the rooftop duct member 50 may be formed by bending the end of the cylindrical portion 51 toward the outside of the cylindrical portion 51. In this case, in order to prevent rainwater from entering through the gap between the mounting portion 29 and the flange portion 53, a first sealant 45a is applied by caulking around the fastening member 60, and a second sealant 45b is applied by caulking along the outer edge of the flange portion 53. In addition, a gasket 46 is provided that is sandwiched between the mounting portion 29 and the flange portion 53 to complement the sealing properties of the sealants 45a and 45b.

[0030] In addition, a heat insulating material (not shown) such as glass wool of a predetermined thickness is provided on the outer surface of the duct body 20 within a protective cover LC (racking cover) indicated by a dashed line in FIG. 1. By providing the heat insulating material on the outer surface of the duct body 20 in this manner, the flow of heat between the space inside the duct body 20 and the outdoors is blocked, and as a result, the temperature change of the air flowing inside the duct body 20 is suppressed, and the occurrence of condensation inside the duct body 20 is suppressed. The heat insulating material also functions as a sound absorbing material that prevents the sound of rain caused by rain hitting the duct body 20 from resonating inside the room. Note that the heat insulating material may be provided on the inner surface instead of the outer surface of the duct body 20, or may be provided on both the outer and inner surfaces of the duct body 20.

[0031] In order to prevent rainwater from accumulating on the upper surface of the duct body 20, it is preferable that the upper surface of the duct body 20 has a gentle slope with respect to the horizontal plane, as shown in FIG.

[0032] In addition to the duct body 20 having the above-mentioned shape, the rooftop duct structure 100 further includes a sleeve 16 provided on the inner peripheral surface of the through hole 11 as shown in Fig. 1. One end of an indoor duct member 18 disposed indoors is connected to the lower end of the sleeve 16. The other end of the indoor duct member 18 is connected to an exhaust port or an intake port of the indoor facility.

[0033] This makes it possible to exhaust indoor air to the outdoors through the indoor duct member 18, the through hole 11, the duct body 20 and the rooftop duct member 50, and also makes it possible to supply air from the outdoors to the indoors through the rooftop duct member 50, the duct body 20, the through hole 11 and the indoor duct member 18.

[0034] Here, when installing rooftop ducts 3 for exhaust or supply air on the roof of building 1, conventionally, as shown in Fig. 6, rooftop ducts 3 are installed from pigeon coops 2 made of reinforced concrete or the like installed on roof slab 10 toward each fan 4. Also, in the ceiling of building 1, multiple indoor ducts (not shown) are installed from each indoor facility toward below pigeon coop 2. In other words, the indoor ducts and rooftop ducts 3 are connected inside pigeon coop 2. Note that Fig. 6 is a view of the rooftop plan of building 1 viewed from above.

[0035] On the other hand, since the rooftop duct structure 100 configured as above can prevent rainwater from entering the building through the through hole 11, when installing an exhaust or air supply duct on the roof of the building 1 via the rooftop duct structure 100, as shown in Fig. 7, it is possible to easily install an exhaust or air supply facility by providing rising parts 12 near each indoor facility that requires exhaust or air supply, and connecting the blower 4 installed near the rising parts 12 and the rooftop duct structure 100 installed on the rising parts 12 with rooftop duct members 50. Note that Fig. 7 is a view of the rooftop plan of the building 1 from above, similar to Fig. 6.

[0036] Furthermore, since it is possible to provide the through hole 11 connecting the indoor side with the outdoor side near the indoor facility where exhaust and supply of air are required, the rooftop duct member 50 and the indoor duct member 18 can be significantly shortened compared to the case where a pigeon coop 2 is used as in the conventional method.

[0037] As a result, it is possible to reduce the construction time required to install the rooftop duct member 50 and the indoor duct member 18, and also to reduce the number of materials required to manufacture the rooftop duct member 50 and the indoor duct member 18, thereby reducing construction costs. Furthermore, the shorter lengths of the rooftop duct member 50 and the indoor duct member 18 reduce pressure loss (airflow resistance), thereby reducing power consumption of the blower 4.

[0038] Furthermore, compared to the conventional example using a pigeon coop 2 as shown in FIG. 6, the rooftop duct components 50, blowers 4, etc. are prevented from being placed close together on the rooftop of the building 1, which facilitates maintenance work on the rooftop duct components 50, blowers 4, etc. and enables effective use of the available space on the rooftop.

[0039] According to the above-described first embodiment, the following effects are achieved.

[0040] In the rooftop duct structure 100 configured as described above, a duct body 20 having a downward opening 21 that opens downward and a side opening 22 that opens laterally is placed on the rooftop slab 10 so that the downward opening 21 faces the through hole 11 and the side opening 22 is connected to a rooftop duct member 50 installed on the roof, and the through hole 11 and the rooftop duct member 50 are connected through the internal space of the duct body 20.

[0041] Therefore, simply by installing the duct body 20, to which the rooftop duct member 50 can be attached, on the rooftop slab 10 so as to cover the through-hole 11, it is possible to communicate the indoor side and the outdoor side of the building 1 through the through-hole 11 and to prevent rainwater from infiltrating indoors through the through-hole 11. This makes it unnecessary to construct a pigeon coop made of reinforced concrete or the like on the rooftop slab 10 in the past in order to prevent rainwater from infiltrating through the through-hole 11, and as a result, the construction period for the building can be shortened.

[0042] Specifically, for example, when constructing a pigeon coop made of reinforced concrete or the like on the roof slab 10, the indoor duct member 18 cannot be erected from inside the building until construction of the pigeon coop is completed, which may delay interior work on the floors below. However, with the roof duct structure 100 configured as described above, for example, the duct body 20 can be installed on the roof slab 10 so as to cover the through hole 11 and the duct body 20 can be covered with a waterproof sheet or the like, or the upper end of the sleeve 16 provided on the inner surface of the through hole 11 can be blocked to prevent rainwater from entering the building, making it possible to simultaneously carry out work such as waterproofing on the rooftop side and interior work on the indoor side (for example, work to connect the indoor duct member 18 to the sleeve 16, etc.) in parallel.

[0043] In addition, by providing the through hole 11 near the indoor facility where exhaust and supply of air are required, it is possible to shorten the indoor duct member 18 installed indoors, and it is possible to position the blower 4 relatively freely on the roof slab 10 and shorten the roof duct member 50 connected to the blower 4, which ultimately reduces construction costs.

[0044] <Second embodiment> Next, a rooftop duct structure 200 according to a second embodiment of the present invention will be described with reference to Fig. 8 to Fig. 10. Below, differences from the first embodiment will be mainly described, and descriptions of configurations that are the same as or equivalent to those described in the first embodiment will be omitted.

[0045] The rooftop duct structure 200 according to the second embodiment is mainly different from the rooftop duct structure 100 according to the first embodiment described above in that the duct body 120 is fixed to a sleeve 116 provided on the inner peripheral surface of the through hole 11, instead of to an angle material 14 attached to the rising portion 12. Note that Fig. 8 is a cross-sectional view showing a cross section corresponding to Fig. 1, and Fig. 9 is a cross-sectional view taken along line DD in Fig. 8. Fig. 10 is an enlarged view showing the portion indicated by the arrow E in Fig. 8.

[0046] The rooftop duct structure 200 connects the indoor side with the outdoor side through a through hole 11 provided in the rooftop slab 10, and comprises a duct body 120 having a downward opening 121 that opens downward and a lateral opening 122 that opens laterally, and a sleeve 116 that is provided on the inner surface of the through hole 11 and to which the duct body 120 is connected.

[0047] 8 and 9, the duct body 120 is disposed on the roof slab 10 so that the lower opening 121 faces the through hole 11 provided in the roof slab 10 and the side opening 122 is connected to the roof duct member 150 installed on the roof. In other words, the through hole 11 and the roof duct member 150 communicate with each other through the internal space of the duct body 120.

[0048] The duct body 120 is a hollow structure formed of a galvanized steel plate, and has a first flange portion 125 where the lower opening 121 opens, a second flange portion 126 where the side opening 122 opens, and a tubular portion 127 with a substantially rectangular cross section having the first flange portion 125 at one end and the second flange portion 126 at the other end. The material of the duct body 120 is not limited to galvanized steel, but is preferably made of a weldable metal from the viewpoint of ensuring airtightness, and in particular, when the pressure of the fluid flowing through the duct body 120 is relatively high, negative, or fluctuates, it is preferable to use a galvanized steel plate or stainless steel plate with high rigidity in order to suppress deformation of the duct body 120. When there is no need to suppress deformation of the duct body 120, a plate material made of aluminum or an aluminum alloy may be used.

[0049] In order to reduce pressure loss (airflow resistance) of the air flowing inside, the tubular portion 127 is formed to be curved in an arc shape from the first flange portion 125 to the second flange portion 126 when viewed from the side, as shown in FIG. 8.

[0050] In addition, in order to prevent rainwater from directly entering the duct body 120 through the side opening 122, the second flange portion 126 into which the side opening 122 opens is formed so that when the duct body 120 is installed on the roof slab 10, the flange surface is inclined with respect to the vertical plane and the side opening 122 faces slightly vertically downward rather than horizontally.

[0051] Specifically, the magnitude of the angle θ formed by the first plane P1, which is the flange surface of the first flange portion 125 on which the downward opening 121 opens, and the second plane P2, which is the flange surface of the second flange portion 126 on which the side opening 122 opens, is set so that the side opening 122 faces vertically downward, and for example, as shown in FIG. 8, when the first flange portion 125 is placed relative to a horizontal plane, is set to be greater than 90°, preferably in the range of 100° to 120°.

[0052] The shape of the tubular portion 127 is not limited to being curved in an arc from the first flange portion 125 to the second flange portion 126, and may be bent in an elbow shape or in a stepwise manner from the first flange portion 125 to the second flange portion 126, as long as the angle θ between the first plane P1 and the second plane P2 is set so that the side opening 122 faces vertically downward.

[0053] As shown in Fig. 10, the duct body 120 having the above-mentioned shape is installed above the rising portion 12 of the roof slab 10 that rises around the through hole 11, via the first flange portion 125 formed at the lower end. In other words, the duct body 120 is attached to the roof slab 10 so as to cover the open end of the through hole 11. The opening formed approximately in the center of the first flange portion 125 becomes the lower opening 121 described above.

[0054] Specifically, as shown in FIG. 10, the duct body 120 is installed in the rising portion 12 by fixing a first flange portion 125 to a flange portion 117 formed at the upper end of a sleeve 116 provided on the inner surface of the through hole 11 via a fastening member (not shown).

[0055] 9 and 10, a third gap G3 that can be filled with a sealant is formed around the entire periphery between the first flange portion 125 of the duct body 120 installed on the rising portion 12 in this manner and the upper surface of the rising portion 12. Note that in FIG. 9, the sealant is not shown in order to clearly show the gap into which the sealant is filled.

[0056] The first back-up material 47a is first loaded into the third gap G3 between the first flange portion 125 and the upper surface of the rising portion 12, and then the first seal material 48a is filled in by caulking. After the first seal material 48a has dried to a certain extent, the second back-up material 47b is loaded, and then the second seal material 48b is filled in by caulking.

[0057] In order to ensure that the gap between the first flange portion 125 and the upper surface of the rising portion 12 is sealed by the sealing material, the outer edge of the flange portion 117 of the sleeve 116 is located inside the outer edge of the first flange portion 125 and inside the portion where the second sealing material 48b is filled, and preferably inside the portion where the first sealing material 48a is filled.

[0058] In this way, by providing a double seal around the entire circumference between the duct body 120 and the rising portion 12, it is possible to reliably prevent rainwater from entering through the gap between the duct body 120 and the rising portion 12. In addition, because the duct body 120 is installed on the upper surface of the rising portion 12, rainwater that has accumulated on the roof slab 10 is less likely to reach the gap between the duct body 120 and the rising portion 12.

[0059] The rooftop duct member 150 is a tubular member formed of a galvanized steel plate, and has a cylindrical portion 151 having a substantially rectangular cross-sectional shape and a flange portion 152 formed at the end of the cylindrical portion 151. The other end of the cylindrical portion 151 is directly or indirectly connected to a blower (not shown) installed on the rooftop slab 10. For example, when the blower is installed indoors, the other end of the rooftop duct member 150 may be a duct hood that is open vertically downward without being connected to the blower. The material of the rooftop duct member 150 is not limited to galvanized steel, and may be stainless steel, aluminum, or an aluminum alloy.

[0060] 8, the rooftop duct member 150 is attached to the duct body 120 by fixing the flange portion 152 to the second flange portion 126 of the duct body 120 via a fastening member. A gasket (not shown) is provided between the second flange portion 126 and the flange portion 152 to reliably prevent the infiltration of rainwater. The opening formed approximately in the center of the second flange portion 126 becomes the above-mentioned side opening portion 122.

[0061] Further, on the outer surface of the duct body 120, a heat insulating material (not shown) such as glass wool of a predetermined thickness is provided within a protective cover LC (racking cover) indicated by a dashed line in FIG. 8. By providing the heat insulating material on the outer surface of the duct body 120 in this manner, the flow of heat between the space inside the duct body 120 and the outdoors is blocked, and as a result, the temperature change of the air flowing inside the duct body 120 is suppressed, and the occurrence of condensation inside the duct body 120 is suppressed. The heat insulating material also functions as a sound absorbing material that prevents the sound of rain caused by rain hitting the duct body 120 from resonating inside the room. Note that the heat insulating material may be provided on the inner surface instead of the outer surface of the duct body 120, or may be provided on both the outer and inner surfaces of the duct body 120.

[0062] Moreover, one end of an indoor duct member 18 disposed indoors is connected to the lower end of the sleeve 116, the upper end of which is connected to the duct body 120. The other end of the indoor duct member 18 is connected to an exhaust port or an intake port of the indoor facility.

[0063] This makes it possible to exhaust indoor air to the outdoors through the indoor duct member 18, the through hole 11, the duct body 120 and the rooftop duct member 150, and also makes it possible to supply air from the outdoors to the indoors through the rooftop duct member 150, the duct body 120, the through hole 11 and the indoor duct member 18.

[0064] As described above, the duct body 120 is in a state in which the flange surface (second plane P2) of the second flange portion 126 into which the side opening 122 opens is inclined with respect to the vertical direction so that the side opening 122 faces vertically downward, i.e., the center of gravity is located closer to the second flange portion 126. Therefore, a load acts on the fastening portion between the duct body 120 and the sleeve 116, tending to cause the duct body 120 to fall toward the second flange portion 126.

[0065] When such a load acts on the fastening portion between duct body 120 and sleeve 116, the gap between first flange portion 125 and the upper surface of rising portion 12 may widen slightly at a location far from the center of gravity of duct body 120. For example, in the example shown in Fig. 8, the gap between first flange portion 125 and the upper surface of rising portion 12 widens slightly on the right side of the figure, and as a result, the sealing performance of seal materials 48a, 48b provided at that location may decrease.

[0066] In order to prevent the gap between the first flange portion 125 and the upper surface of the rising portion 12 from widening and reducing the sealing performance, the rooftop duct structure 200 further includes a support portion 130 that supports the side opening 122 side of the duct body 120 from below.

[0067] The support part 130 has a base part 131 installed on the roof slab 10 and a pillar 132 extending upward from the base part 131, and is arranged in pair on either side of the side opening 122 of the duct body 120, as shown in Figure 9.

[0068] The support pillar 132 is, for example, an angle member, and the duct body 120 has a plurality of brackets 128 attached thereto, which are fastened to one side of the support pillar 132 via fastening members (not shown).

[0069] Incidentally, the support 132 or the base portion 131 may be provided with a height adjustment portion that can adjust the height at which the bracket 128 is attached to the support 132.

[0070] In this manner, the side opening 122 side of the duct body 120 is supported from below by the support portion 130, thereby preventing the gap between the first flange portion 125 and the upper surface of the rising portion 12 from widening, and as a result, the sealing properties provided by the sealing materials 48a, 48b can be maintained.

[0071] According to the second embodiment described above, similarly to the first embodiment, the following effects are achieved.

[0072] In the rooftop duct structure 200 configured as described above, a duct body 120 having a downward opening 121 that opens downward and a side opening 122 that opens to the side is placed on the rooftop slab 10 so that the downward opening 121 faces the through hole 11 and the side opening 122 is connected to a rooftop duct member 150 installed on the roof, and the through hole 11 and the rooftop duct member 150 are connected through the internal space of the duct body 120.

[0073] Therefore, simply by installing the duct body 120, to which the rooftop duct member 150 can be attached, on the rooftop slab 10 so as to cover the through-hole 11, it is possible to communicate the indoor side and the outdoor side of the building 1 through the through-hole 11 and to prevent rainwater from infiltrating indoors through the through-hole 11. This makes it unnecessary to construct a pigeon coop made of reinforced concrete or the like on the rooftop slab 10 in the past in order to prevent rainwater from infiltrating through the through-hole 11, and as a result, the construction period for the building can be shortened.

[0074] In addition, the following modified examples are also within the scope of the present invention, and it is possible to combine the configurations shown in the modified examples with the configurations described in the above-mentioned embodiments, or to combine the configurations described in the different modified examples below.

[0075] In each of the above embodiments, the duct body 20, 120 is installed on the upper surface of the rising portion 12 rising from the roof slab 10. Alternatively, the duct body 20, 120 may be installed directly on the roof slab 10. Note that, in order to make it difficult for rainwater that has accumulated on the roof slab 10 to infiltrate indoors through the through-hole 11, it is preferable to provide a rising portion 12 that rises around the through-hole 11 and install the duct body 20, 120 on top of it.

[0076] Furthermore, in the above first embodiment, it has been explained that the duct body 20 and the rooftop duct member 50 have portions that are formed by bending (for example, the lower edge portion 27 and the flange portion 52, etc.), but these portions may be formed by any processing method as long as they have the shapes shown in each figure; for example, they may be formed by directly bending the members, they may be formed by drawing processing or the like, or they may be formed by welding the members together.

[0077] In the second embodiment, the first flange portion 125 is fixed to the flange portion 117 of the sleeve 116, and defines a third gap G3 between the first flange portion 125 and the upper surface of the rising portion 12. Alternatively, for example, the member defining the third gap G3 between the upper surface of the rising portion 12 and the first flange portion 125 may be a member different from the first flange portion 125 fixed to the flange portion 117 of the sleeve 116.

[0078] In addition, in the above second embodiment, the rooftop duct member 150 is connected to the duct body 120, but the duct body 120 may be a duct hood with the side opening 122 side open vertically downward without the rooftop duct member 150 being connected.

[0079] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments. [Explanation of symbols]

[0080] 100,200···Rooftop duct structure 20,120···Duct body 21,121...Downward opening 22,122...Side opening 10. Roof slab 11...Through hole 12... Rising section 16,116···Sleeve 18...Indoor duct parts 26... First folding section (folding section) 42a... First seal material (seal material) 42b Second sealing material (sealing material) 50,150···Rooftop duct material 130...Support part G1: First gap (gap)

Claims

1. A rooftop duct structure that connects the indoor side and the outdoor side through a through hole provided in the rooftop slab, The duct body has a lower opening portion that opens downward and a side opening portion that opens laterally, The duct body is disposed on the roof slab so that the lower opening faces the through hole and the side opening is connected to a roof duct member installed on the roof; A rooftop duct structure in which the through hole and the rooftop duct member communicate with each other through the internal space of the duct body.

2. A bent portion is provided around the entire periphery of the side surface of the duct body, A sealant is filled into the gap formed between the roof slab and the bent portion. The rooftop duct structure according to claim 1.

3. The duct body is disposed above a rising portion of the roof slab that rises around the through hole. The rooftop duct structure according to claim 1 or 2.

4. an angle formed by a first plane in which the lower opening is open and a second plane in which the side opening is open is set so that the side opening faces vertically downward; The side opening side of the duct body is supported by a support part installed on the roof. The rooftop duct structure according to claim 1 or 2.

5. A sleeve is further provided on an inner circumferential surface of the through hole, The duct body is connected to an upper end of the sleeve through the lower opening, An indoor duct member to be installed indoors is connected to the lower end of the sleeve. The rooftop duct structure according to claim 1 or 2.

6. The duct body is attached to the roof slab so as to cover the open end of the through hole. The rooftop duct structure according to claim 1 or 2.

7. A heat insulating material is provided on the outer surface of the duct body. The rooftop duct structure according to claim 1 or 2.

8. The duct body is formed of a metal plate material. The rooftop duct structure according to claim 1 or 2.

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