ventilation duct unit

Abstract

To provide a ventilation duct unit with low cost that is easy to construct.SOLUTION: A ventilation duct unit provided on a side of a precast concrete plate forming an external wall that partitions an indoor side comprises: a first duct which has a hollow portion penetrating in a prospective direction; and two second ducts which are fixed to the first duct, make the hollow portion communicate with an indoor side or an outdoor side, and respectively have a shape material with the same cross section. One of the two second ducts is provided integrally with the precast concrete plate in a state connected to the first duct. The first duct has a fixing portion to which the other of the two second ducts is fixed. The fixing portion is arranged at a position exposed from the precast concrete plate.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a ventilation duct unit. [Background technology]

[0002] A known ventilation section structure includes a ventilation box, which is embedded in a precast concrete panel (PC panel) that forms an exterior wall member and has a hollow portion, a vertical window frame that is a fitting attached to the indoor side of the PC panel and has hollow portions that communicate with the indoor and outdoor sides, and a flexible duct that is flexible and bellows-shaped and connects the hollow portion of the ventilation box to the hollow portion of the vertical window frame between the ventilation box and the vertical window frame (see, for example, Patent Document 1). The flexible duct of this ventilation section is made of a resin member that has a hollow portion, and annular fitting protrusions are formed along the outer periphery of each of the indoor and outdoor end edges of the flexible duct. The fitting protrusions of the flexible duct fit into recesses provided in the ventilation box and the vertical window frame, respectively, thereby connecting the hollow portions of the ventilation box and the vertical window frame in a watertight and airtight manner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-301551 Summary of the Invention [Problem to be solved by the invention]

[0004] The flexible ducts of the conventional ventilation units described above have a hollow, flexible, bellows-like shape, resulting in low rigidity. Therefore, the process of fitting the recesses of the ventilation box and vertical window frame with the fitting protrusions of the flexible duct to connect them is more complicated than connecting rigid components with screws. Furthermore, since the flexible duct must be connected to both the ventilation box and vertical window frame, the connecting process is even more complicated.

[0005] Furthermore, although the ventilation box and the vertical window frame embedded in the PC board both have hollow sections that connect the indoor and outdoor sides, they are separate components, which increases manufacturing costs.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a ventilation duct unit that is easy to install and low cost. [Means for solving the problem]

[0007] In order to achieve this purpose, the ventilation duct unit of the present invention is a ventilation duct unit installed on the side of a precast concrete panel that forms an exterior wall separating the indoor side, and comprises: a first duct having a hollow portion that penetrates in the forward direction; and two second ducts that are fixed to the first duct and connect the hollow portion to the indoor or outdoor side, and each have a shaped member with the same cross-sectional shape, one of the two second ducts being connected to the first duct and being integral with the precast concrete panel, and the first duct has a fixing portion to which the other of the two second ducts is fixed, and the fixing portion is positioned in a position exposed from the precast concrete panel. Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a ventilation duct unit that is easy to install and low cost. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an external view showing a curtain wall equipped with a ventilation duct unit according to this embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 2 is a cross-sectional view of FIG. 1 taken along line B-B. [Figure 4] FIG. 1 is a perspective view showing a ventilation duct unit provided in a curtain wall. [Figure 5] FIG. 2 is a perspective view showing the configuration of a ventilation duct unit. [Figure 6] FIG. 2 is a horizontal cross-sectional view showing the shapes of an outdoor duct, a communication duct, and an indoor duct that make up the ventilation duct unit. [Figure 7] FIG. 2 is a horizontal cross-sectional view showing a ventilation duct unit installed in a curtain wall. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a ventilation duct unit according to one embodiment of the present invention will be described with reference to the drawings.

[0011] The ventilation duct unit 1 of this embodiment is provided in a curtain wall 2 and is used as the exterior wall of a building, as shown in Fig. 1. The curtain wall 2 is provided in each opening formed by a plurality of upright mullions (not shown) spaced apart in the left-right direction and horizontal members (not shown) spaced apart in the up-down direction between adjacent mullions, thereby constituting the exterior wall.

[0012] In the following explanation, when the ventilation duct unit 1 is provided and the curtain wall 2 attached to the building is viewed from the outside, the up and down direction is referred to as the up and down direction, the left and right direction is referred to as the left and right direction, and the depth direction, which is the indoor / outdoor direction, is referred to as the prospective direction. Even when each part of the ventilation duct unit 1 and the curtain wall 2, or each member that makes up the ventilation duct unit 1 and the curtain wall 2 is in a standalone state, the directions will be specified and explained in terms of the up and down direction, left and right direction, and prospective direction when the curtain wall 2 is attached to the building.

[0013] As shown in Figures 1 to 3, the curtain wall 2 that forms the exterior wall of the building has a height approximately equal to the distance (floor height) between the floor 3 and ceiling material 4 of each floor of the building, and includes a fixed window section 5 fitted with double-glazed glass 5a, a vertical wall section 6 located immediately to the right of the fixed window section 5, and a horizontal wall section 7 located below the fixed window section 5 and the vertical wall section 6. Both the vertical wall section 6 and the horizontal wall section 7 are precast concrete panels (hereinafter referred to as PC panels). The horizontal wall section 7 is positioned to cover the space between the floor 3 of the floor on which the fixed window section 5 is installed and the ceiling material 4 of the floor below it from the outdoors side, and forms a so-called spandrel (waist wall).

[0014] The vertical wall section 6 has a vertical wall main body 8 that has the same height as the fixed window section 5, a vertical extension section 9 that extends outdoors from the right end of the vertical wall main body 8, and an embedded duct unit 10 that is disposed to the right of the vertical wall main body 8 and vertical extension section 9 and forms part of the ventilation duct unit 1. The embedded duct unit 10 is disposed within a formwork for forming the vertical wall section 6 during the manufacture of the PC board that forms the vertical wall section 6, and concrete is poured between the formwork and the embedded duct unit 10, whereby the embedded duct unit 10 is integrated with the vertical wall main body 8 and vertical extension section 9 and is provided so as to be exposed on the right side of the vertical wall section 6.

[0015] The outdoor portion of vertical extension portion 9, together with a portion of buried duct unit 10, extends below fixed window portion 5, and is located on the outdoor side of horizontal wall portion 7 provided below fixed window portion 5, overlapping the right end of horizontal wall portion 7 in the projection direction. Here, the portion of vertical extension portion 9 that extends below fixed window portion 5 and overlaps with the outdoor side of horizontal wall portion 7 forming the spandrel corresponds to hanging portion 6a, and the portion of buried duct unit 10 provided in hanging portion 6a corresponds to hanging duct portion 10a.

[0016] The vertical extension portion 9 has a vertical visible surface portion 9a located on the right side and forming a visible surface, and a vertical inclined surface portion 9b located on the left side of the vertical visible surface portion 9a and having an inclined surface whose protrusion amount from the vertical wall main body portion 8 increases toward the right side.

[0017] The horizontal wall section 7 has a horizontal wall main body 11 that has the same thickness as the vertical wall main body 8, and a horizontal extension 12 that extends from the lower end toward the outdoors over the entire length in the left-right direction. The horizontal extension 12 has a horizontal visible surface 12a that forms a visible surface on the lower side, and a horizontal inclined surface 12b that is provided above the horizontal visible surface 12a and has an inclined surface that protrudes more from the horizontal wall main body 11 downward.

[0018] The amount of projection of the horizontal surface 12a and the vertical surface 9a is approximately the same. The portion of the vertical projection 9 that extends below the fixed window 5 and the lower end of part of the buried duct unit 10 extend slightly above the horizontal inclined surface 12b. The horizontal projection 12 forms a canopy for the floor below.

[0019] The ventilation duct unit 1 has a buried duct unit 10 that is provided integrally with the vertical wall portion 6, and an indoor duct 13 that is connected to the indoor side of the buried duct unit 10.

[0020] 4 and 5, the buried duct unit 10 has an outdoor duct 14 provided at the right end of the vertical extension portion 9, and a communication duct 15 provided at the right end of the vertical wall main body portion 8, which connects the outdoor duct 14 and the indoor duct 13. In other words, the ventilation duct unit 1 has the outdoor duct 14 and communication duct 15 that constitute the buried duct unit 10, and the indoor duct 13. The outdoor duct 14 and communication duct 15 are connected and molded integrally with the PC board that forms the vertical wall portion 6, and the outdoor duct 14 is located on the indoor side at the right end of the vertical extension portion 9, and its outdoor side is covered by the vertical extension portion 9.

[0021] The communicating duct 15 has a communicating inner wall member 16 provided on the right side of the vertical wall main body 8, a communicating outer wall member 17 arranged with a gap to the right of the communicating inner wall member 16, and a communicating bottom plate 18 connecting the lower ends of the communicating inner wall member 16 and the communicating outer wall member 17. The communicating inner wall member 16 and the communicating outer wall member 17 are extruded shapes extruded in the vertical direction and have a length approximately equal to the height of the adjacent fixed window section 5. The communicating inner wall member 16 and the communicating outer wall member 17 are formed so that the length of the indoor end is slightly shorter than the length of the outdoor end. Therefore, the communicating bottom plate 18 connecting the lower ends of the communicating inner wall member 16 and the communicating outer wall member 17 is inclined so that its height decreases from the indoor side to the outdoor side.

[0022] As shown in Figures 4 to 6, the communicating inner wall member 16 has an inner wall main body portion 16a that forms a plane along the forward direction, inner duct fixing portions 16b that are provided on the right side of the indoor end and the outdoor end of the inner wall main body portion 16a, respectively, and to which the outdoor duct 14 or the indoor duct 13 is fixed, and inner wall anchors 16c that are provided on the left side of the inner wall main body portion 16a, respectively, and are embedded in the vertical wall main body portion 8 and the vertical extension portion 9.

[0023] On the right side of the inner wall main body 16a, i.e., the surface facing the communicating outer wall member 17, there are provided an end plate 19 that closes the upper end of the communicating duct 15 and the upper end of the outdoor duct 14, and a screw threading portion 16d for screwing in the communicating bottom plate 18 that connects the lower end of the communicating duct 15, and a water return piece 16e is provided in approximately the center in the forward direction. The water return piece 16e protrudes toward the communicating outer wall member 17 and is inclined so that the distance from the inner wall main body 16a increases toward the outdoor side.

[0024] The indoor-side inner duct fixing portion 16b has an inner-wall indoor extension piece 16f that extends to the right from the indoor-side end of the inner-wall main body portion 16a and forms a sighting surface, and an inner-wall indoor duct fixing piece 16g that extends indoors from the tip of the inner-wall indoor extension piece 16f and is used to fix the indoor duct 13. The outdoor-side inner duct fixing portion 16b has an inner-wall outdoor extension piece 16h that extends right from the outdoor-side end of the inner-wall main body portion 16a and forms a sighting surface, and an inner-wall outdoor duct fixing piece 16i that extends outdoor from the tip of the inner-wall outdoor extension piece 16h and is used to fix the outdoor duct 14.

[0025] The interior wall anchor 16c extends to the left side of the interior wall main body portion 16a, i.e., toward the vertical wall main body portion 8 and vertical extension portion 9. The communicating interior wall member 16 is arranged so that the interior wall indoor extension piece 16f is flush with the indoor surface of the vertical wall main body portion 8, so the indoor-side interior wall anchor 16c extends from the indoor-side end of the interior wall main body portion 16a and is inclined toward the outdoor side so that the gap with the interior wall main body portion 18a increases, and is embedded in the vertical wall main body portion 8. The outdoor-side interior wall anchor 16c extends leftward from the outdoor-side end of the interior wall main body portion 16a and is embedded in the vertical extension portion 9.

[0026] The communicating outer wall member 17 has an outer wall main body portion 17a that faces the inner wall main body portion 16a and forms a plane along the forward direction, and outer duct fixing portions 17b that are provided on the left side of the indoor end and the outdoor end of the outer wall main body portion 17a, respectively, to which the outdoor duct 14 or the indoor duct 13 is fixed.

[0027] On the left side of the exterior wall main body 17a, i.e., the surface facing the communicating inner wall member 16, there are provided an end plate 19 that closes the upper end of the communicating duct 15 and the upper end of the outdoor duct 14, and screw threading portions 17c for screwing in the communicating bottom plate 18 that connects the lower end of the communicating duct 15. Water return pieces 17d are provided near the indoor end and the outdoor end in the projection direction. Each water return piece 17d protrudes toward the communicating inner wall member 16 and is inclined so that the distance from the exterior wall main body 17a increases toward the outdoor side.

[0028] The indoor-side exterior duct fixing portion 17b has an exterior wall indoor extension piece 17e that extends left from the indoor-side end of the exterior wall main body portion 17a and forms a visible surface, and an exterior wall indoor duct fixing piece 17f that extends indoors from the tip of the exterior wall indoor extension piece 17e and fixes the indoor duct 13. The outdoor-side exterior duct fixing portion 17b has an exterior wall outdoor extension piece 17g that extends left from the outdoor-side end of the exterior wall main body portion 17a and forms a visible surface, and an exterior wall outdoor duct fixing piece 17h that extends outdoors from the tip of the exterior wall outdoor extension piece 17g and fixes the outdoor duct 14. In other words, the communicating exterior wall member 17 and the communicating interior wall member 16 have the same shape except for the water-reflecting pieces 16e, 17d and the interior wall anchor 16c, and are arranged left and right reversed.

[0029] The communicating bottom plate 18 is made of a substantially rectangular flat plate, and is in contact with the lower ends of the communicating inner wall member 16 and the communicating outer wall member 17, with the communicating inner wall member 16 and the communicating outer wall member 17 facing each other with a gap between them. The communicating bottom plate 18 is fixed by screws entering from below and threadedly engaging with the screw threading portions 16d, 17c of the communicating inner wall member 16 and the communicating outer wall member 17, thereby connecting the lower ends of the communicating inner wall member 16 and the communicating outer wall member 17 to each other.

[0030] A flat end plate 19 that covers the upper part of the joined outdoor duct 14 and communicating duct 15 is abutted on top of the communicating inner wall member 16 and the communicating outer wall member 17, and screws entering from above are screwed into each screw threading portion 16d, 17c of the communicating inner wall member 16 and the communicating outer wall member 17 to fix them, connecting the upper ends of the communicating inner wall member 16 and the communicating outer wall member 17 to each other.

[0031] The communicating duct 15, in which the communicating inner wall member 16 and the communicating outer wall member 17 are connected in a rectangular shape by the communicating bottom plate 18 and the end plate 19, has a hollow portion 15a that communicates in the indoor / outdoor direction (front direction), and within the hollow portion 15a, the water-reflecting pieces 16e of the communicating inner wall member 16 and the water-reflecting pieces 17d of the communicating outer wall member 17 are arranged alternately along the indoor / outdoor direction. Here, the communicating duct 15 corresponds to the first duct.

[0032] The outdoor duct 14 has an arc-shaped duct material 20 having a curved portion 20a whose horizontal cross section is approximately a quarter-circle in shape, a side end duct material 21 arranged at the right end of the curtain wall 2 with a gap between it and the arc-shaped duct material 20, a lower blocking plate 22 that blocks the indoor side at the bottom of the outdoor duct 14, and an outdoor bottom plate 23 that connects the lower end of the outdoor duct 14.

[0033] The arc-shaped duct material 20, the side-end duct material 21, and the lower closure plate 22 are extruded shapes extruded in the vertical direction, and the arc-shaped duct material 20 and the side-end duct material 21 are also extruded shapes using the same extrusion mold as the indoor duct 13. That is, the arc-shaped duct material 20 and the side-end duct material 21 of the outdoor duct 14 and the arc-shaped duct material 24 and the side-end duct material 25 of the indoor duct 13 are formed using the same extrusion mold, and the lengths of the two are different in the extrusion direction (longitudinal direction), and they are installed with their indoor / outdoor directions reversed. Therefore, the indoor / outdoor direction of the arc-shaped duct material 24 and the side-end duct material 25 of the indoor duct 13 is opposite to that of the arc-shaped duct material 20 and the side-end duct material 21 of the outdoor duct 14.

[0034] The outdoor duct 14 and the indoor duct 13 correspond to two second ducts, with the outdoor duct 14 corresponding to one of the second ducts that is fixed to the communication duct 15 as the first duct and is integral with the PC board, and the indoor duct 13 corresponding to the other second duct. The outdoor duct 14 corresponds to the second duct that communicates with the outdoors.

[0035] Here, the arc-shaped duct materials 20, 24 and the side-end duct materials 21, 25 will be mainly described using the arc-shaped duct material 20 and the side-end duct material 21 of the outdoor duct 14 as an example, and a detailed description of the arc-shaped duct material 24 and the side-end duct material 25 of the indoor duct 13 will be omitted. Also, in the drawings, each part of the arc-shaped duct material 20 and the side-end duct material 21 of the outdoor duct 14 is indicated by adding an alphabet to the number indicating the arc-shaped duct material 20 and the side-end duct material 21 of the outdoor duct 14, and in the arc-shaped duct material 24 and the side-end duct material 25 of the indoor duct 13, the parts corresponding to the outdoor duct 14 are indicated by adding the same alphabet to the number indicating the arc-shaped duct material 24 and the side-end duct material 25 of the indoor duct 13.

[0036] The arc-shaped duct material 20 and side end duct material 21 that form the outdoor duct 14 are formed to be longer than the connecting duct 15 to which they are joined. The side end duct material 21 is positioned toward the center of the arc formed by the curved portion 20a of the arc-shaped duct material 20, and the upper ends of the arc-shaped duct material 20 and the side end duct material 21 are joined and closed by an end plate 19, and the lower ends are joined and closed by an outdoor base plate 23, thereby forming a hollow portion 14c that has an indoor opening 14a that opens to the indoor side and a right-side opening 14b that opens to the right side of the curtain wall 2, and that is bent at a nearly right angle.

[0037] When outdoor duct 14 is joined to communication duct 15, the upper side of outdoor duct 14 is connected to communication duct 15, and indoor opening 14a of hanging duct portion 10a protruding below communication duct 15 is closed by lower closure plate 22. Right opening 14b is open to the right side of curtain wall 2 over its entire length.

[0038] The arc-shaped duct material 20 has a curved portion 20a, a visible wall portion 20b that extends from the indoor end of the curved portion 20a to the indoor side to form a visible surface, and a visible wall portion 20c that extends to the right from the outdoor end of the curved portion 20a to form a visible surface, and an arc-shaped duct material fixing portion 20d that is fixed to the inner duct fixing portion 16b of the communicating inner wall member 16 is provided on the right side of the indoor end of the visible wall portion 20b.

[0039] The arc-shaped duct material fixing portion 20d has an arc-shaped duct material extension piece 20e that extends to the right from the indoor-side end of the visible wall portion 20b and forms a visible surface, and a duct material fixing piece 20f that extends indoors from near the tip of the arc-shaped duct material extension piece 20e. As shown in Figure 7, the right side of the duct material fixing piece 20f abuts against the left side of the inner wall outdoor duct fixing piece 16i of the communicating inner wall member 16, and they are connected by a screw entering from the left side.

[0040] On the right end of the sight wall 20c and on the inner surface of the curved portion 20a, there are provided an end plate 19 that closes the upper end of the communication duct 15 and the upper end of the outdoor duct, and a screw thread portion 20g that fastens the outdoor bottom plate 23. On the right side of the screw thread portion 20g provided on the right end of the sight wall 20c, there are provided a main body side mesh material holding portion 20h that holds the mesh material 26, and a main body side net holding portion 20i that holds the bird netting 27. The main body side mesh material holding portion 20h is open on the indoor side and recessed on the outdoor side to form a groove extending in the vertical direction, into which the outdoor side end of the mesh material 26 is inserted.

[0041] The main body side net holding portion 20i has a net facing wall portion 20j, in which the right wall portion forming the groove of the main body side mesh material holding portion 20h extends outdoors and faces the bird net 27, and a main body right extension piece 20k, which extends to the right from the outdoors side end of the net facing wall portion 20j.

[0042] A bird net 27 covering the right-side opening 14b is arranged in the main body-side net holding portion 20i of the outdoor duct 14 so as to extend between it and the side end duct material 21, and is sandwiched between a net clamping material 28 screwed to the main body right extension piece 20k and the net-facing wall portion 20j. Note that the outdoor duct 14 is provided with the bird net 27 but not with the net material 26, and the indoor duct 13 is provided with the net material 26 but not with the bird net 27.

[0043] On the outdoor side of the main body right extension piece 20k, there is provided a front-direction extension piece 20l that extends toward the outdoor side, and an anchor material 29 is screwed to the front-direction extension piece 20l, which is inclined in a direction that widens the distance from the front wall portion 20c toward the left, as shown in Figure 7.

[0044] The side end duct material 21 has a side end mesh material holding portion 21a that faces and is spaced apart on the indoor side of the main body side mesh material holding portion 20h provided on the arc-shaped duct material 20. The side end mesh material holding portion 21a is open on the outdoor side and recessed on the indoor side, forming a groove shape that runs vertically, into which the end of the mesh material 26 is inserted.

[0045] The side end duct material 21 has a side end projection wall portion 21b, where the right wall portion forming the groove of the side end mesh material holding portion 21a extends indoors, a side end duct extension piece 21c, which extends to the right from the indoor side end of the side end projection wall portion 21b, and a side end duct material fixing piece 21d, which extends indoors from the side end duct extension piece 21c. The left surface of the side end duct material fixing piece 21d is abutted so as to overlap with the right surface of the exterior wall outdoor duct fixing piece 17h of the communicating exterior wall member 17, and is connected to the communicating exterior wall member 17 by a screw entering from the right side.

[0046] The side end duct extension piece 21c has an opposing wall portion 21e that faces the side end projection wall portion 21b with a gap in the left-right direction, and the indoor end of the bird netting 27 that covers the right-side opening 14b is held between the side end projection wall portion 21b and the opposing wall portion 21e. In addition, on the indoor side of the side end mesh material holding portion 21a and the side end projection wall portion 21b, there are provided screw threading portions 21f into which screws are threaded that fasten the end plate 19 that closes the upper end of the outdoor duct 14 and the outdoor bottom plate 23 that closes the lower end of the outdoor duct 14.

[0047] The lower blocking plate 22 has a blocking plate portion 22a that covers the area below the connecting duct 15 in the indoor opening 14a of the outdoor duct, two blocking plate extension portions 22b that are provided near the left and right ends of the blocking plate portion 22a and extend toward the outdoor side, and a screw threading portion 22c that is provided along the vertical direction on the outdoor side surface of the blocking plate portion 22a.

[0048] The lower blocking plate 22 is secured with screws from the outside, with the left side surface of the left blocking plate extension 22b overlapping the right side surface of the duct material fixing piece 20f of the arc-shaped duct material 20, and the right side surface of the right blocking plate extension 22b overlapping the left side surface of the side end duct material fixing piece 21d of the side end duct material 21. The outdoor end of the communicating bottom plate 18 of the communicating duct 15 abuts against the upper end of the lower blocking plate 22 and is secured with screws from above to the screw threaded portion 22c. The indoor end of the outdoor bottom plate 23 abuts against the lower end of the lower blocking plate 22 and is secured with screws from below to the screw threaded portion 22c. Therefore, the communicating bottom plate 18 and the outdoor bottom plate 23 are connected with a step.

[0049] The indoor duct 13 has an arc-shaped duct material 24 and a side end duct material 25 that are different in length from the outdoor duct 14, an indoor upper plate 30 that abuts against the upper ends of the arc-shaped duct material 24 and the side end duct material 25 to close the upper end of the indoor duct 13, and an indoor bottom plate 31 that abuts against the lower ends of the arc-shaped duct material 24 and the side end duct material 25 to close the lower end of the indoor duct 13. The upper ends of the arc-shaped duct material 24 and the side end duct material 25 of the indoor duct 13 are joined and closed by the indoor upper plate 30, and the lower ends are joined and closed by the indoor bottom plate 31, thereby forming a hollow portion 13c that has an outdoor opening 13a that opens to the outdoors and a right-side opening 13b that opens to the right side of the curtain wall 2, and that is bent at a nearly right angle.

[0050] The arc-shaped duct material 24 and side end duct material 25 of the indoor duct 13 are formed slightly shorter than the connecting duct 15 to which they are joined. Furthermore, the length of the indoor side end of the arc-shaped duct material 24 and side end duct material 25 is formed slightly shorter than the length of the outdoor side end. For this reason, the indoor bottom plate 31 connecting the lower end of the indoor duct 13 is inclined so that its height decreases from the indoor side toward the outdoor side.

[0051] In the indoor duct 13, the right-side opening 13b is covered by a mesh material 26 that spans between the main body-side mesh material holding portion 24h of the arc-shaped duct material 24 and the side-end mesh material holding portion 25a of the side-end duct material 25. Also, as shown in Figure 7, a pivotable support member 34 is fixed to the side-end duct extension piece 25c of the side-end duct material 25 of the indoor duct 13, and a door body 32 that can open and close the right-side opening 13b is pivotably supported by the pivotable support member 34.

[0052] 7, the buried duct unit 10 is connected to the outdoor duct 14 and the communicating duct 15 by fastening the duct material fixing piece 20f of the outdoor duct 14 to the inner wall outdoor duct fixing piece 16i of the communicating duct 15 with screws, and by fastening the side end duct material fixing piece 21d of the outdoor duct 14 to the outer wall outdoor duct fixing piece 17h of the communicating duct 15 with screws. After the connection, a wet sealant 33 is filled into the recess formed by the arc-shaped duct material extension piece 20e, the duct material fixing piece 20f, and the inner wall outdoor extension piece 16h. Furthermore, a wet sealant 33 is filled into the recess formed by the side end duct extension piece 21c, the side end duct material fixing piece 21d, and the outer wall outdoor extension piece 17g.

[0053] The vertical wall section 6 is formed by appropriately placing the embedded duct unit 10 in a formwork that forms a precast concrete plate that constitutes the vertical wall section 6, and then pouring concrete into the formwork to form the vertical wall section 6 equipped with the embedded duct unit 10.

[0054] The formed vertical wall section 6 is formed so that the indoor surface of the concrete is flush with the indoor surfaces of the inner wall indoor extension piece 16f and the outer wall indoor extension piece 17e of the connecting duct 15, and the inner duct fixing section 16b and the outer duct fixing section 17b located on the indoor side are exposed to the indoor side beyond the indoor surface of the concrete in the vertical wall section 6.

[0055] A recess is provided at the boundary between the concrete portion on the indoor side of the formed vertical wall section 6 and the connecting duct 15, and at the boundary between the concrete portion on the right side of the vertical wall section 6 and the outdoor duct 14, and a wet sealant 33 is filled into the recess.

[0056] The indoor duct 13 is connected to the buried duct unit 10 by screws fastening the inner wall indoor duct fixing piece 16g of the inner duct fixing part 16b exposed on the indoor side of the vertical wall part 6 and the duct material fixing piece 24f of the indoor duct 13, and the outer wall indoor duct fixing piece 17f of the outer duct fixing part 17b exposed on the indoor side of the vertical wall part 6 and the side end duct material fixing piece 25d of the indoor duct 13.

[0057] After the connection, a wet sealant 33 is filled into the recess formed by the arc-shaped duct material extension piece 24e and duct fixing piece 24f of the indoor duct 13 and the interior wall indoor extension piece 16f. Also, a wet sealant 33 is filled into the recess formed by the side end duct extension piece 25c and side end duct material fixing piece 25d of the indoor duct 13 and the exterior wall indoor extension piece 17e. The indoor duct 13 and the buried duct unit 10 may be connected with the vertical wall portion 6 alone, or with the vertical wall portion 6 incorporated into the curtain wall 2, or with the curtain wall 2 incorporating the vertical wall portion 6 installed at the construction site.

[0058] The outdoor end of the indoor bottom plate 31 of the connected indoor duct 13 and the indoor end of the communicating bottom plate 18 of the communicating duct 15 are arranged with a gap in the vertical direction, and a wet sealant (not shown) is filled between them. In other words, the indoor bottom plate 31 and the communicating bottom plate 18 are connected with a step.

[0059] According to the ventilation duct unit 1 of this embodiment, the outdoor duct 14 is integrally formed with the PC board while being connected to the communication duct 15, eliminating the need to connect the outdoor duct 14 and the communication duct 15 on-site. Furthermore, the indoor-side inner duct fixing portion 16b and the outer duct fixing portion 17b, which secure the indoor duct 13 provided on the communication duct 15, are located in positions exposed from the PC board. Therefore, the ventilation duct unit 1, which connects indoors and outdoors, can be installed on the PC board simply by fixing the indoor duct 13 to the inner duct fixing portion 16b and the outer duct fixing portion 17b exposed from the curtain wall 2 already installed at the construction site. Furthermore, since the curtain wall 2 having this PC board can be handled with the indoor duct 13 removed, the curtain wall 2 has few protruding portions, making it easy to store, transport, and handle.

[0060] Furthermore, the arc-shaped duct materials 20, 24 and side end duct materials 21, 25 of the outdoor duct 14 and indoor duct 13 attached to the communication duct 15 are manufactured from the same extruded material, which reduces manufacturing costs. This makes it possible to provide a ventilation duct unit 1 that is easy to install and low cost.

[0061] Furthermore, since the lower end of outdoor duct 14, which communicates with the outdoors, is lower than the lower end of communication duct 15, it is possible to prevent water that has entered communication duct 15 from entering the indoor side.

[0062] Furthermore, in the vertical wall section 6 where communication duct 15 is provided, hanging duct section 10a of outdoor duct 14 is provided on the indoor side of hanging section 6a which overlaps with the outdoor side of horizontal wall section 7 which forms the adjacent spandrel below, so that water which has entered communication duct 15 flows into hanging duct section 10a of outdoor duct 14. For this reason, water which has reached communication duct 15 can be discharged from hanging duct section 10a, making it possible to more reliably prevent water which has reached hanging duct section 10a from entering the communication duct 15 side.

[0063] In addition, the communicating duct 15 is provided with water-reflecting pieces 16e, 17d that protrude into the hollow portion 15a, making it possible to prevent rainwater and the like from directly entering the indoor side from the outdoor duct 14 side.

[0064] Furthermore, the above-described embodiments are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof.

[0065] The present embodiment includes at least the following inventions. This ventilation duct unit is installed on the side of a precast concrete panel that forms an exterior wall separating the indoor side, and comprises: a first duct having a hollow portion that penetrates in the forward direction; and two second ducts that are fixed to the first duct and connect the hollow portion to the indoor or outdoor area, and each have a shaped member with the same cross-sectional shape, one of the two second ducts being connected to the first duct and being formed integrally with the precast concrete panel, the first duct having a fixing portion to which the other of the two second ducts is fixed, and the fixing portion is positioned in a position exposed from the precast concrete panel.

[0066] With this ventilation duct unit, one of the second ducts is connected to the first duct and is integral with the precast concrete slab, eliminating the need to connect the one second duct to the first duct on-site. Furthermore, the fastening portion of the first duct for fastening the other second duct is located in a position exposed from the precast concrete slab. Therefore, simply fastening the other second duct to the exposed fastening portion of the precast concrete slab already installed at the construction site makes it possible to provide a ventilation duct connecting indoors and outdoors in the precast concrete slab. Furthermore, since the precast concrete slab can be handled with the other second duct removed, there is little protruding from the slab, making it easy to store, transport, and handle.

[0067] Furthermore, since the two second ducts attached to the first duct each have a section with the same cross-sectional shape, it is possible to reduce manufacturing costs, making it possible to provide a ventilation duct unit that is easy to install and low cost.

[0068] In this ventilation duct unit, the lower end of the second duct communicating with the outdoors is lower than the lower end of the first duct.

[0069] With such a ventilation duct unit, the lower end of the second duct that connects to the indoors is lower than the lower end of the first duct, making it possible to prevent water that has entered the first duct from entering the indoors.

[0070] Such a ventilation duct unit is characterized in that the precast concrete plate has a hanging portion that overlaps the outdoor side of the adjacent spandrel below, and one of the second ducts has a hanging duct portion located on the indoor side of the hanging portion.

[0071] In this ventilation duct unit, the precast concrete panel on which the first duct is provided has a hanging duct portion of one of the second ducts on the indoor side of the hanging portion that overlaps the outdoor side of the adjacent spandrel below, so that water that enters the first duct flows into the hanging duct portion of the second duct. This allows water that has entered the first duct to be discharged from the hanging duct portion, making it possible to more reliably prevent water that has reached the hanging duct portion from entering the first duct.

[0072] In this ventilation duct unit, the first duct has a water-reflecting piece that protrudes into the hollow portion.

[0073] With such a ventilation duct unit, the first duct is provided with a water-reflecting piece that protrudes into the hollow portion, making it possible to prevent rainwater and the like from directly entering the indoor side from the second duct provided on the outdoor side. [Explanation of symbols]

[0074] 1 ventilation duct unit, 2 curtain wall, 6 vertical wall section, 6a hanging part, 7 horizontal wall part, 8 vertical wall main body part, 9 vertical extension part, 10a: Hanging duct section, 13: Indoor duct, 14: Outdoor duct, 15: Connecting duct, 15a hollow portion, 16b inner duct fixing portion, 16e water return piece, 16g Inner wall indoor duct fixing piece, 17b Outer duct fixing part, 17d Water return piece, 17f Exterior wall indoor duct fixing piece, 18 Connecting bottom plate, 23 Outdoor bottom plate

Claims

1. A ventilation duct unit installed on the side of a precast concrete plate that forms an exterior wall separating the indoor side, A first duct having a hollow portion penetrating in the forward direction; and two second ducts fixed on both sides of the first duct in the forward direction, Each of the two second ducts is a shape having the same cross-sectional shape when viewed in the up-down direction perpendicular to the projection direction, one of the two second ducts communicates with the hollow portion on an outdoor side of the first duct, and the other of the two second ducts communicates with the hollow portion on an indoor side of the first duct, The second duct is integral with the precast concrete slab while being connected to the first duct, the first duct has a fixing portion to which the other second duct is fixed, A ventilation duct unit characterized in that the fixing portion is positioned in a position exposed from the precast concrete plate.

2. 2. The ventilation duct unit according to claim 1, A ventilation duct unit characterized in that the lower end of one of the second ducts is lower than the lower end of the first duct.

3. The ventilation duct unit according to claim 1 or 2, The precast concrete slab has a hanging portion that overlaps the exterior side of the adjacent spandrel below; A ventilation duct unit characterized in that one of the second ducts has a hanging duct portion located on the indoor side of the hanging portion.

4. A ventilation duct unit according to any one of claims 1 to 3, A ventilation duct unit characterized in that the first duct has a water-reflecting piece protruding into the hollow portion.

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