JP2015169368A - duct structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict a plurality of ducts from generating damage at a duct structure in which a ventilation duct is constituted by connecting ducts to each other.SOLUTION: An air conditioning duct is constituted by connecting a plurality of duct segments to each other. Each of outer circumferential surfaces of adjoining duct segments 42A, 42B is respectively provided with protrusions 51A, 51B that are oppositely faced to each other. A connecting bracket 53 connecting the adjoining ducts 42 to each other is fixed to each of the opposing protrusions 51A, 51B. The connecting bracket 53 comprises: a winding segment 54 wound to each of protrusions 51A, 51B under a state in which each of the protrusions 51A, 51B is enclosed in total; and a pair of connecting ends 55a, 55b for use in fixing the connecting bracket 53 to each of the protrusions 51A, 51B that are extended from both ends of the winding segment 54 toward outside of the winding segment 54 and connected to each other.

Description

  The present invention relates to a duct structure.

  As an air conditioner installed in a building such as a house, an air conditioner that generates air conditioned air and a ventilation duct (air conditioner duct) that conveys the air conditioned air to a living space are known (for example, Patent Documents). 1).

  As this type of ventilation duct, there is one configured by connecting a plurality of duct portions arranged along the ventilation path to each other. In such a ventilation duct, a duct adapted to the building can be configured by appropriately changing the number and arrangement of the duct portions according to the layout of the building in which the ventilation duct is installed.

  In such a ventilation duct, adjacent duct portions are connected to each other using a fastener such as a bolt. For example, the flange portions provided at the boundary portion between the adjacent duct portions are fastened to each other by a fastener so that the duct portions are connected to each other.

JP 2008-241198 A

  By the way, in the above-described duct structure in which a plurality of duct parts are connected to each other to form a duct, it is conceivable that each duct part is formed of foamed polystyrene in order to improve the heat insulating performance of the duct. However, since styrene foam is a material having relatively low strength (in other words, brittle), there is a risk that if the duct parts are fastened with fasteners such as bolts, the duct parts may be broken at the fastening part. is there.

  In addition, when the duct portion is formed of a resin material other than expanded polystyrene, the same problem as described above may occur if the material has a relatively low strength. Furthermore, even when the duct portion is formed of a material such as a hard resin having a relatively high strength, for example, if the fastener is tightened too strongly, the duct portion may still be damaged.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to suppress the occurrence of breakage in a duct portion in a duct structure in which a plurality of duct portions are connected to each other to form a ventilation duct. It is what.

  In order to solve the above problems, the duct structure of the first invention includes a ventilation duct through which air flows, and the ventilation duct is connected to a plurality of duct portions arranged along the ventilation path of the ventilation duct. Protruding portions that are opposed to each other are provided on the outer peripheral surfaces of the adjacent duct portions, and a plurality of the protruding portions facing each other are provided along the boundary portion of the adjacent duct portions. Each of the opposing protrusions is provided with a long connecting tool that connects the adjacent duct parts to each other, and the connecting tool collects the opposing protruding parts. A winding portion provided so as to be wound around each of the projecting portions in an enclosed state, extending from both ends of the winding portion toward the outside of the winding portion, and coupled to each other. In, characterized in that it comprises a pair of connecting end portions for attaching the connector to the respective projecting portion.

  According to the present invention, the protruding portions are provided on the outer peripheral surfaces of the adjacent duct portions so as to face each other, and the adjacent duct portions are made to each other by attaching the connecting tool to each of the facing protruding portions. . In this case, the winding part of the coupling tool is provided so as to be wound around each projecting part in a state of surrounding the projecting parts facing each other, and a pair of coupling end parts provided at both ends of the winding part in that state. Are connected to each other so that the connector is attached. Here, since the pair of connecting end portions extend from both ends of the winding portion to the outside of the winding portion, the connection end portions are connected to each other outside the winding portion. Therefore, compared with the case where adjacent duct parts are fastened with fasteners, such as a volt | bolt, duct parts can be connected, suppressing that an excessive force (for example, fastening force) acts on a duct part. . Thereby, in a duct structure in which a ventilation duct is configured by connecting a plurality of duct portions to each other, it is possible to prevent the duct portion from being damaged.

  The duct structure of the second invention is the duct structure according to the first invention, wherein the winding part has a folding part for folding the winding part, and is wound around the projecting parts facing each other by being bent at the folding part. It is characterized by being deformable into a shape.

  According to the present invention, since the winding portion can be wound around each protruding portion by folding the winding portion at the bending portion, the winding portion can be easily wound around each protruding portion. As a result, it is possible to easily attach the connecting tool to each projecting portion, and thus connect the duct portions easily.

  The duct structure of a third invention is the duct structure according to the second invention, wherein the ventilation duct is arranged so that the duct portions are arranged side by side in a ceiling space in a building, and the adjacent duct portions The opposing projecting portions are respectively provided on the side surface portions on both sides of the duct portions, and the coupling tool is attached to each of the opposing projecting portions on the side surface portions on both sides of the duct portions, and the pair The connecting end portion extends downwardly from the winding portion and is fastened from below by a fastener in a state of being overlapped with each other.

  By the way, the case where the above-mentioned ventilation duct is installed in the direction where each duct part becomes side by side in the ceiling back space in a building can be considered. In that case, the case where the installation of the duct part to the back of the ceiling and the connection work are performed from under the ceiling can be considered. Therefore, in the present invention, in view of such a point, the protruding portions facing each other in the adjacent duct portions are arranged on the side surface portions on both sides of the duct portions, respectively, and the protrusions are connected to each other on both sides of the duct portion. Each is done on the surface side. Thereby, even if it is from under a ceiling, it becomes possible to attach a connection tool in multiple places with respect to the adjacent duct part.

  Here, when each connecting end is fastened from below the ceiling with a fastener, it is conceivable to extend each connecting end from the wrapping portion directly below in order to facilitate the fastening operation. However, in that case, since the fasteners are fastened from the side to the respective connecting end portions, it is conceivable that the fastening work is a work at a relatively high position and the work is difficult. Therefore, it is conceivable to extend each connecting end part from the winding part (for example, the lower end part thereof) to the side, but in that case, the fastening operation of the connecting end part is a work directed directly upward, so in this case as well. There seems to be difficulty in terms of workability. Therefore, in the present invention, in view of these points, each connection end portion is provided to be inclined downward from the winding portion. Thereby, compared with said each case, the fastening operation | work of connection edge parts can be made easy, and the connection operation | work of the duct parts from under a ceiling can be made easy.

  The duct structure according to a fourth aspect is characterized in that, in the third aspect, the pair of connecting end portions are inclined downward from the winding portion in a direction facing the lower surface of the winding portion.

  According to the present invention, since the pair of connecting end portions are inclined downward from the winding portion in a direction facing the lower surface of the winding portion, when the connecting end portions are fastened from below by the fasteners, Of these, it is possible to prevent the upper connecting end portion from being pushed upward by the fastener and escaping. Thereby, the fastening operation | work of the connection edge parts from under a ceiling can be made still easier, and the connection work of a duct part can be made still easier.

  The duct structure of the fifth invention is the duct structure according to any one of the first to fourth inventions, wherein an airtight member having elasticity is interposed between the adjacent duct portions, and the adjacent duct portions are connected to the connector. In a state where the airtight members are connected to each other, the airtight member is in a compressed state between the duct portions.

  In the above-described configuration in which a plurality of duct portions are connected to each other in the ventilation duct, an airtight member may be interposed between the two duct portions in order to ensure airtightness between adjacent duct portions. In that case, the airtight member is interposed between the duct portions in a compressed state. Here, when adjacent duct parts are fastened with a fastener such as a bolt, it is conceivable that the compression amount of the airtight member varies depending on the tightening amount of the fastener. In this case, it is conceivable that the interval between adjacent duct portions varies, and as a result, the length (full length) of the ventilation duct changes. In that case, there is a possibility that inconveniences such as the inability to install a ventilation duct may occur.

  In this regard, in the present invention, as described above, the duct portions are connected to each other in a state where the protruding portions of the adjacent duct portions are wound around the winding portion. In such a connected state, the adjacent duct portions are biased toward the side away from each other by the repulsive force based on the compression of the airtight member interposed between the adjacent duct portions, while the winding portions wound around the respective projecting portions. This restricts the movement toward the separated side. In this case, since the interval between the protruding portions and the interval between the adjacent duct portions will be defined by the connecting bracket, even in a configuration in which an airtight member is interposed between the adjacent duct portions in a compressed state, It becomes possible to keep the space | interval of those duct parts constant. Therefore, it is possible to connect the duct portions while avoiding the above-described disadvantage.

  The duct structure according to a sixth aspect of the present invention is the ducted structure according to any one of the first to fifth aspects, wherein the winding portion is engaged with a winding surface around which the winding portion is wound in each of the opposing protrusions. The winding portion is engaged with the engaged portion, so that displacement of the opposing protruding portion toward the protruding side is restricted.

  According to the present invention, the winding portion is engaged with the engaged portion provided on the winding surface in a state where the winding portion is wound on the winding surface of the opposing protruding portion, and the winding portion and thus the coupling tool is engaged by the engagement. Displacement to the protruding side of the opposing protruding portion is restricted. In this case, since it can prevent that a connection tool remove | deviates from the protrusion part which opposes, the connection state of duct parts can be maintained reliably.

  In the duct structure of the seventh invention according to the sixth invention, a groove portion as the engaged portion is formed on the winding surface, and the winding portion protrudes toward the groove portion to the groove portion. An engagement protrusion to be engaged is provided, and the groove and the engagement protrusion are formed so as to extend along the winding direction of the winding portion, respectively.

  According to the present invention, the groove portion is formed on the winding surface of the opposing protruding portion, and the engaging protrusion of the winding portion protrudes and engages with the groove portion so that the coupling tool (winding) toward the protruding side of the protruding portion is formed. Part) is restricted. In this case, the effect of the sixth invention can be obtained.

  Moreover, since the engaging protrusion is formed so as to extend along the winding direction of the winding portion, it is possible to increase the (bending) strength of the winding portion in the direction orthogonal to the winding direction (inside and outside direction of the winding portion). it can. That is, in this case, the winding portion can be reinforced by using the engaging protrusion for restricting the displacement of the connector. Thereby, since it can suppress that the winding part wound around the protrusion part bends outside and winding is loosened, the connection state of duct parts can be maintained more reliably.

  A duct structure according to an eighth invention is characterized in that, in any one of the first to seventh inventions, the ventilation duct is installed in a building and fixed to the building via the connector. To do.

  According to the present invention, a connector for connecting the duct portions can be used as a base for fixing the ventilation duct to the building. Thereby, multifunctionalization of a connecting tool can be achieved.

  Further, when the duct part is formed of a low-strength material such as polystyrene foam, it is considered difficult to attach a fixing bracket for fixing the ventilation duct to the building. For example, if the fixing bracket is to be attached to the duct portion using a fastener such as a screw, the duct portion may be damaged or the fastener may come out of the duct portion. In that respect, according to the present invention, since the ventilation duct is fixed to the building via the connector, even if the duct portion is formed of a low-strength material, the ventilation duct is installed in the building while avoiding the above-described disadvantages. Can be fixed to.

  The duct structure according to a ninth aspect is characterized in that, in any one of the first to eighth aspects, the duct portion is formed of foamed polystyrene.

  According to the present invention, since the duct portion is formed of foamed polystyrene, a ventilation duct having excellent heat insulation performance can be constructed. On the other hand, since polystyrene foam is a relatively fragile material, there is a high possibility that the duct portion will be damaged when the duct portions are fastened (connected) with a fastener such as a bolt. In view of this point, the present invention applies the first invention to such a configuration. In this case, the duct portions can be connected to each other while the duct portions are made of styrene foam and the damage to the duct portions is suppressed.

The schematic longitudinal cross-sectional view which shows the structure in a building. The perspective view which shows the structure of an air conditioner and its periphery. The disassembled perspective view shown in the state which decomposed | disassembled the adjacent duct part. It is a perspective view which shows the connection structure of adjacent duct parts, (a) has shown the connection state of the connection part, (b) has shown the connection cancellation | release state of the connection part. The structure of a connection bracket is shown, (a) is a side view showing the same structure, (b) is a plan view, (c) is a front view, and (d) is a bottom view. The top view which shows the installation structure of the air-conditioning duct in ceiling back space. The longitudinal cross-sectional view which shows the installation structure of the air-conditioning duct in ceiling back space. The perspective view which shows the state by which the fixed bracket was attached to the connection bracket.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In the present embodiment, the present invention is embodied in a unit type building having a steel frame ramen structure. The unit type building includes a plurality of building units each having a ceiling beam, a floor beam, and a column, and each building unit is combined with each other. Each of these building units is manufactured in advance at a unit manufacturing factory, and then transported to a building site by a truck or the like. And in a construction site, those building units are mutually connected on the foundation, and a building is constructed. FIG. 1 is a schematic longitudinal sectional view showing a configuration in a building.

  As shown in FIG. 1, a building 10 such as a house is provided with a living room 11, a corridor 12, and a machine room 13 as indoor spaces. The corridor 12 connects the living room 11 and the machine room 13, and four sides thereof are partitioned by a partition wall 15 (see also FIGS. 2 and 7). The partition wall 15 is provided with an entrance / exit 17a for entering / exiting between the corridor 12 and the living room 11 and an entrance / exit 17b for entering / exiting between the corridor 12 and the machine room 13. Doors 18a and 18b are provided at the doorways 17a and 17b, respectively.

  A ceiling space 21 is formed above the indoor space. The indoor space and the ceiling space 21 are vertically divided by a ceiling portion 22. The ceiling part 22 has a plurality of ceiling surface materials 23 and 24 made of gypsum board. The ceiling surface materials 23 and 24 include a first ceiling surface material 23 and a second ceiling surface material 24 provided at a position lower than the first ceiling surface material 23.

  The first ceiling member 23 is provided across the living room 11 and the machine room 13, and forms the ceiling surface of the living room 11 and the machine room 13. The first ceiling member 23 is supported by a field edge 27 provided on the lower surface side of the ceiling beam 26. The second ceiling member 24 is provided in the hallway 12 and forms the ceiling surface of the hallway 12. The second ceiling member 24 is supported in a state of being spanned between the partition walls 15 facing each other with the hallway 12 interposed therebetween (see also FIG. 7). The second ceiling member 24 is a so-called falling ceiling. Therefore, the hallway 12 is a low ceiling space whose ceiling height is lower than that of the living room 11 and the machine room 13.

  In addition to the second ceiling surface material 24, a first ceiling surface material 23 is provided above the hallway 12. The ceiling space 21 of the corridor 12 is partitioned vertically by a first ceiling surface material 23. In the ceiling back space 21, the upper side of the first ceiling surface material 23 is an upper space portion 21 a and the lower side of the first ceiling surface material 23 is a lower space portion 21 b. The lower space portion 21 b is surrounded by partition walls 15 on all sides, like the hallway 12.

  The building 10 is provided with an air conditioning facility 30 for air conditioning the indoor space. Hereinafter, the configuration of the air conditioning equipment 30 will be described based on FIG. 2 in addition to FIG. 1. FIG. 2 is a perspective view showing the configuration of the air conditioning equipment 30 and its surroundings. In FIG. 2, for the sake of convenience, the illustration of the partition wall 15 and the like on the front side of the sheet is omitted.

  As shown in FIGS. 1 and 2, the air conditioner 30 includes an air conditioner 31 that generates conditioned air (warm air and cold air), an air conditioner duct 32 connected to the air conditioner 31, and a blowout connected to the air conditioner duct 32. And a chamber 33. The air conditioner 31 is configured as an indoor unit installed in the machine room 13. The air conditioner 31 takes in air flowing into the machine room 13 from the corridor 12 as return air, and generates conditioned air based on the return air. The air conditioner 31 supplies the generated conditioned air to the air conditioning duct 32.

  The air conditioning duct 32 is installed in the lower space 21 b in the ceiling space 21 above the hallway 12. The air conditioning duct 32 is installed along the direction (longitudinal direction) in which the hallway 12 extends in the lower space portion 21b. One end side of the air conditioning duct 32 penetrates the partition wall 15 from the lower space portion 21 b and projects into the machine room 13, and the projecting portion is connected to the air conditioner 31 via the connection duct 34.

  The blowout chamber 33 is connected to a side surface portion of the air conditioning duct 32. The blowout chamber 33 is connected to a plurality of locations (specifically, three locations) in the air conditioning duct 32. The blowout chamber 33 has a blowout port 35 through which conditioned air is blown out. The partition wall 15 is formed with a communication hole 36 that allows the lower space portion 21 b and the living room 11 to communicate with each other, and the blowout chamber 33 is inserted into the communication hole 36 with the air outlet 35 facing the living room 11. In this case, when the conditioned air flowing through the air conditioning duct 32 is supplied to the blowout chamber 33, the conditioned air is blown out from the blowout port 35 toward the living room 11.

  A blowout grill 38 is provided on the blowout outlet 35 side (the living room 11 side) of the blowout chamber 33. The blowing grill 38 is accommodated in a grill accommodating portion 39 provided in the partition wall 15.

  Next, the configuration of the air conditioning duct 32 will be described. The air conditioning duct 32 has a plurality of duct portions 42 arranged side by side, and is configured by connecting the duct portions 42 to each other. Hereinafter, the configuration of the air conditioning duct 32 will be described based on FIG. 3 in addition to FIG. 2. FIG. 3 is an exploded perspective view showing the adjacent duct portions 42 in an exploded state.

  As shown in FIG.2 and FIG.3, the duct part 42 which comprises the air-conditioning duct 32 is formed in the square cylinder shape by the polystyrene foams, such as a polystyrene foam. Specifically, the duct portion 42 has a flat rectangular tube shape in which the length in the horizontal direction (left-right direction) is larger than the length in the vertical direction. An internal passage 43 through which conditioned air flows is formed in the duct portion 42.

  Reinforcing ribs 45 are provided on the upper surface portion 42a and the lower surface portion 42b of the duct portion 42, respectively. On the other hand, none of the side faces 42c of the duct part 42 is provided with such ribs 45. Among the duct portions 42, the duct portion 42 (for example, the right-side duct portion 42 (42 </ b> B) in FIG. 3) in which the blowing chamber 33 is connected to the side surface portion 42 c has an opening 46 that opens at the side surface portion 42 c. Is formed. The opening 46 is a supply port for supplying conditioned air to the blowing chamber 33, and is formed so as to penetrate a side wall portion that divides the inside and outside of the duct portion 42. The opening 46 is formed by cutting a part of the side wall using a tool such as a cutter.

  In addition, since the duct part 42 is formed with the polystyrene foam as mentioned above, the whole side wall part becomes a process object area | region in which the drilling process for forming the opening part 46 is possible. Therefore, the opening 46 can be easily formed in the duct portion 42 to be connected to the blowing chamber 33. Further, the upper surface portion 42 a, the lower surface portion 42 b, and each side surface portion 42 c of the duct portion 42 correspond to the outer peripheral surface of the duct portion 42.

  The duct portion 42 has a pair of end surface portions 42d facing each other at both ends in the direction in which the internal passage 43 extends (the passage extending direction). The internal passages 43 are opened to the outside at the end face portions 42d. Adjacent duct portions 42 are connected with their end face portions 42d facing each other, and the internal passages 43 of the respective duct portions 42 are in communication with each other in the connected state.

  Among the end face parts 42d facing each other in the adjacent duct parts 42, the end face part 42d of one duct part 42 (hereinafter, the reference numeral is denoted by “A” for convenience) has the other duct part 42 (hereinafter, the reference numeral for convenience). And a concave portion 48 that is recessed toward the opposite side of the other duct portion 42B. On the other hand, the end surface portion 42d of the other duct portion 42B is formed with a convex portion 47 protruding toward the one duct portion 42A and a concave portion 48 recessed toward the opposite side of the one duct portion 42A. Has been. In the connected state of both the duct portions 42A and 42B, the convex portion 47 of one duct portion 42A enters the concave portion 48 of the other duct portion 42B, and the convex portion 47 of the other duct portion 42B is in the one duct portion 42A. It enters into the recess 48. Thereby, in the connection state of both duct parts 42A and 42B, it is suppressed that a shift | offset | difference arises between duct parts 42A and 42B. In FIG. 3, a plurality of (specifically, two) convex portions 47 and concave portions 48 are alternately provided along the peripheral edge of the opening of the internal passage 43 at the end surface portions 42 d of the duct portions 42 </ b> A and 42 </ b> B. It has been.

  An airtight member 49 is interposed between the end face portions 42d of the adjacent duct portions 42A and 42B. The airtight member 49 is made of an elastic cushion material (raw material), and is made of, for example, foamed EPDM. The airtight member 49 is formed in an elongated plate shape having a predetermined thickness, and is adhered to the end surface portion 42d of one of the duct portions 42A and 42B with an adhesive. The airtight member 49 is continuously attached to the entire outer peripheral side of the internal passage 43 in the end surface portion 42d. The airtight member 49 ensures airtightness between the adjacent duct portions 42A and 42B. In addition, the airtight member 49 may be affixed to the end surface portions 42d of the duct portions 42A and 42B, respectively.

  Next, a connection configuration between the adjacent duct portions 42A and 42B will be described based on FIG. 4 in addition to FIG. 4A and 4B are perspective views showing a connection configuration between adjacent duct portions 42A and 42B, in which FIG. 4A shows a connection release state of the connection portion, and FIG. 4B shows a connection state of the connection portion. .

  As shown in FIG. 3, each duct portion 42 (42 </ b> A, 42 </ b> B) is provided with a protruding portion 51 that protrudes laterally on the side surface portion 42 c on both sides. Two protrusions 51 are provided on each of the side portions 42c on both sides, and the two protrusions 51 are disposed at both ends of the side portion 42c (ends on the end surface portions 42d side). .

  Each protrusion 51 has a quadrangular prism shape extending in the vertical direction (the height direction of the duct portion 42), and extends over the entire vertical direction of the side surface portion 42c. Of the pair of side surfaces 51 a and 51 b facing each other in the protruding portion 51, one side surface 51 a is flush with the end surface portion 42 d of the duct portion 42. Further, the upper surface 51 c of the protruding portion 51 is flush with the upper surface portion 42 a of the duct portion 42, and the lower surface 51 d of the protruding portion 51 is flush with the lower surface portion 42 b of the duct portion 42. In the following description, for the sake of convenience, A is added to the reference numeral of the protruding part 51 of the duct part 42A, and B is added to the reference numeral of the protruding part 51 of the duct part 42B.

  As shown in FIGS. 4A and 4B, in a state where the adjacent duct portions 42A and 42B are connected, the protruding portions 51A and 51B of the respective duct portions 42A and 42B are arranged to face each other. Yes. In this case, the projecting portions 51A and 51B are opposed to each other on both side surfaces of the duct portions 42A and 42B. The opposing projecting portions 51A and 51B are arranged close to each other and have a rectangular parallelepiped shape as a whole. In this case, the upper surface 51c of each protrusion 51A, 51B is located on the same plane, and the lower surface 51d of each protrusion 51A, 51B is located on the same plane. In addition, each protrusion 51A. 51B may be arranged in contact.

  A long connection bracket 53 is attached to each of the protruding portions 51A and 51B facing each other in a state of surrounding the protruding portions 51A and 51B together. The connection bracket 53 is attached to the protruding portions 51A and 51B facing each other on both side surfaces of the duct portions 42A and 42B. Adjacent duct portions 42A and 42B are connected to each other by the pair of connection brackets 53. The connecting bracket 53 corresponds to a connecting tool.

  FIG. 5 shows the configuration of the connection bracket 53. 5A is a side view showing the configuration of the connection bracket 53, FIG. 5B is a plan view, FIG. 5C is a front view, and FIG. 5D is a bottom view. Note that FIG. 5 shows the connection bracket 53 in an unfolded state (specifically, a state before the connection bracket 53 is bent by a bending portion 61 described later). Hereinafter, the structure of the connection bracket 53 will be described with reference to FIG. 5 in addition to FIG. 4.

  As shown in FIGS. 4 and 5A to 5D, the connection bracket 53 is formed of a long metal plate. The connection bracket 53 has a winding portion 54 wound around each of the projecting portions 51A and 51B facing each other, and a pair of connection end portions 55 provided at both ends of the winding portion 54 and connected to each other.

  The winding part 54 has a rectangular ring shape surrounding the projecting parts 51A and 51B facing each other, and is wound around the projecting parts 51A and 51B. The winding portion 54 is provided on the vertical plate portion 54a provided on the side surface 51b of the protruding portion 51B, the upper horizontal plate portion 54b provided across the upper surface 51c of each protruding portion 51A, 51B, and the side surface 51b of the protruding portion 51A. It has a vertical plate portion 54c provided and a lower horizontal plate portion 54d provided across the lower surface 51d of each projecting portion 51A, 51B. In this case, both end portions of the winding portion 54 are end portions of the vertical plate portion 54a (specifically, an end portion opposite to the upper horizontal plate portion 54b side) and end portions of the lower horizontal plate portion 54d (specifically, the vertical plate). And an end opposite to the portion 54c side).

  The connection bracket 53 is not necessarily formed of a metal plate material, and may be formed of a resin plate material. Further, the side surface 51b, the upper surface 51c, and the lower surface 51d of each projection 51A, 51B around which the winding portion 54 (each plate portion 54a to 54d) is wound in each projection 51A, 51B are the “winding surfaces” of the projections 51A, 51B, respectively. It corresponds to.

  Each of the vertical plate portions 54a and 54c of the winding portion 54 is provided with a pair of flange portions 57 at both ends in the width direction (short direction). These flange portions 57 extend from the vertical plate portions 54a and 54c to the sides facing (approaching) each other. In other words, each flange portion 57 protrudes from the vertical plate portions 54 a and 54 c toward the inside of the winding portion 54. Further, each flange portion 57 is formed so as to extend along the longitudinal direction of the vertical plate portions 54a and 54c (in other words, the winding direction of the winding portion 54), and more specifically, in the entire longitudinal direction of the vertical plate portions 54a and 54c. It extends over.

  Of the pair of flange portions 57, the flange portion 57a disposed inside the duct portion 42 (near the side surface portion 42c) enters the groove portion 58 formed in the protruding portions 51A and 51B. The groove part 58 is formed in the side surface 51b of each protrusion part 51A, 51B, respectively, and is extended over the longitudinal direction (up-down direction) whole region of protrusion part 51A, 51B. When the flange portion 57a enters and engages with the groove portion 58, the winding portion 54 and thus the connecting bracket 53 are restricted from being displaced to the protruding side of the protruding portions 51A and 51B. The flange portion 57a corresponds to the engaging protrusion, and the groove portion 58 corresponds to the engaged portion.

  On the other hand, of the pair of flange portions 57, the flange portion 57b disposed on the outer side of the duct portion 42 (the side away from the side surface portion 42c) is disposed on the outer surfaces (projecting tip surfaces) of the projecting portions 51A and 51B.

  The winding portion 54 is provided with a bending portion 61 for bending the winding portion 54 along a boundary portion between the vertical plate portion 54a and the upper horizontal plate portion 54b. The bent portion 61 is constituted by a pair of cuts 62 formed at both ends in the width direction of the winding portion 54 at the boundary portion. These cuts 62 have a mountain shape that becomes narrower toward the inside of the winding portion 54 in the width direction. With the bent portion 61 (the notch 62), the vertical plate portion 54a and the upper horizontal plate portion 54b can be easily bent manually along the boundary portions of each other. The shape of the notch 62 is not necessarily limited to the mountain shape, and may be other shapes such as a straight line shape.

  Here, before the winding part 54 is wound around each protrusion part 51A, 51B, as shown to Fig.4 (a), the vertical board part 54a and upper side horizontal board part 54b which adjoin via the bending part 61 are in a straight line. The shape is lined up. As shown in FIG. 4B, when the winding portion 54 is bent at the bending portion 61, specifically, when the vertical plate portion 54a is bent downward at the bending portion 61 with respect to the upper horizontal plate portion 54b, The winding portion 54 is deformed into a shape that winds around each of the protruding portions 51A and 51.

  Of the pair of connecting end portions 55, the connecting end portion 55a is connected to the end portion of the vertical plate portion 54a (specifically, the end portion on the opposite side to the upper horizontal plate portion 54b side), and the connecting end portion 55b is the lower horizontal plate. It is connected to the end of the portion 54d (specifically, the end opposite to the vertical plate portion 54c side). Each of the connecting end portions 55a and 55b extends from both ends of the winding portion 54 toward the outer side (outer peripheral side) of the winding portion 54, and is screwed on the fastener 64 in a state of being overlapped with each other at the outer position. Equivalent). Thereby, each connection end part 55a, 55b is mutually connected, As a result, the connection bracket 53 is attached to each protrusion part 51A, 51B.

  More specifically, the connection ends 55a and 55b are connected to each other by the screws 64, and insertion holes 65 and 66 for inserting the screws 64 are formed in the connection ends 55a and 55b, respectively. Of these insertion holes 65, 66, the insertion hole 66 of the connecting end portion 55b is a burring hole to which a screw 64 can be fastened (fitted). The screw 64 is screwed into the insertion hole 66 of the connection end 55b through the insertion hole 65 of the connection end 55a and fastened. The insertion hole 66 of the connecting end 55b may be replaced with a burring hole, and may be a screw hole in which a female screw capable of fastening (screwing) is formed. Further, the screws 64 are not necessarily used as the fasteners, and other fasteners such as bolts and nails may be used.

  Each of the connection end portions 55a and 55b extends downward from the winding portion 54. Specifically, each of the connecting end portions 55a and 55b extends downwardly from the winding portion 54, and more specifically, downwardly inclined in a direction facing the lower surface of the lower lateral plate portion 54d. In this case, the connecting end portions 55a and 55b and the lower lateral plate portion 54d are arranged so as to form an acute angle with each other, and the connecting end portion 55b is the upper side and the connecting end portion 55a is the lower side among the connecting end portions 55a and 55b. Is located. And these connection end parts 55a and 55b are fastened by said screw | thread 64 from the downward direction (below a ceiling).

  Here, in the state where the adjacent duct parts 42A and 42B are connected via the connection bracket 53, the airtight member 49 interposed between the duct parts 42A and 42B (specifically, the end face part 42d) is provided in the duct part 42A. , 42B are in a compressed state. In this case, the adjoining duct portions 42A and 42B are urged toward the side away from each other by the restoring force (biasing force) based on the compression of the airtight member 49, but the projecting portions 51A and 51B of the duct portions 42A and 42B Displacement to the separated side is regulated by the wound connection bracket 53 (specifically, the vertical plate portions 54a and 54c). In such a configuration, the interval between the protruding portions 51A and 51B and the interval between the adjacent duct portions 42A and 42B are defined by the connecting bracket 53, and more specifically, the vertical plate portions 54a and 54a of the connecting bracket 53. It is defined by the interval 54c. Therefore, even if the airtight member 49 is interposed in a compressed state between the adjacent duct portions 42A and 42B, the interval between the duct portions 42A and 42B can be kept constant. Therefore, the entire length of the air-conditioning duct 32 becomes long, and the air-conditioning duct 32 cannot be installed in the ceiling space 21, or the position of the blowing chamber 33 connected to the duct portion 42 is shifted and the blowing chamber 33 can be inserted into the communication hole 36. It is possible to suppress the occurrence of inconvenience such as absence.

  Next, an installation configuration of the air-conditioning duct 32 in the ceiling back space 21 (lower space portion 21b) will be described with reference to FIGS. FIG. 6 is a plan view showing the installation configuration of the air conditioning duct 32 in the ceiling space 21. FIG. 7 is a longitudinal sectional view showing the installation configuration of the air conditioning duct 32 in the ceiling space 21 and corresponds to the sectional view taken along the line AA of FIG.

  As shown in FIGS. 6 and 7, the partition walls 15 facing each other with the corridor 12 (and the lower space portion 21 b) interposed therebetween are configured to have a plurality of wall panels 71 provided side by side. (See also FIG. 2). The wall panel 71 includes a pair of wall materials 72 facing each other and a wall frame 73 provided between the wall materials 72. Each wall material 72 is made of gypsum board. The wall frame 73 is configured by connecting a plurality of frame members 73a and 73b made of wooden squares in a rectangular frame shape. The wall frame 73 includes a pair of vertical frame members 73a extending in the wall height direction at both ends in the width direction of the wall member 72, and a plurality of horizontal frame members 73b extending in the wall width direction across the vertical frame members 73a. And have.

  A ceiling frame 75 that supports the second ceiling surface material 24 from above is provided between the partition walls 15 that are opposed to each other with the corridor 12 interposed therebetween. A plurality of ceiling frames 75 are arranged side by side along the direction in which the hallway 12 extends. The ceiling frame 75 is configured by connecting a plurality of frame members 75a and 75b made of wooden squares in a rectangular frame shape. The ceiling frame 75 has a pair of frame members 75a spanned between the partition walls 15 facing each other, and a pair of frame members 75b connecting the ends of the frame members 75a.

  Each frame member 75b of the ceiling frame 75 is fixed to the wall frame 73 (specifically, the lateral frame member 73b) of the partition wall 15 with screws or the like via the wall surface member 72. Thereby, the ceiling frame 75 is being fixed with respect to each partition wall 15 which opposes, respectively. The second ceiling surface material 24 is fixed to the lower surface side of the ceiling frame 75 with screws or the like.

  On these ceiling frames 75 (specifically, frame members 75b), a plurality (specifically, two) of elongated space members 77 are provided along the direction in which the corridor 12 extends so as to be separated from each other. Yes. The spacer member 77 is fixed on the ceiling frame 75 with screws or the like.

  An air conditioning duct 32 is installed on the plurality of spacer members 77 so as to straddle the spacer members 77. The air conditioning duct 32 is fixed to the spacer member 77 via each connection bracket 53 in the installed state. Specifically, a fixing bracket 78 is attached to the lower part of each connection bracket 53, and the air conditioning duct 32 is fixed to the spacer member 77 by attaching each of the fixing brackets 78 to the spacer member 77. Yes.

  FIG. 8 shows a state in which the fixing bracket 78 is attached to the connection bracket 53. As shown in FIGS. 7 and 8, the fixing bracket 78 is attached to the lower horizontal plate portion 54 d of the connection bracket 53. The fixing bracket 78 is formed of an L-shaped steel plate, and includes a horizontal plate portion 78a fixed to the lower surface of the lower horizontal plate portion 54d with screws 81, and a vertical plate portion 78b extending downward from the horizontal plate portion 78a. And have. The horizontal flat plate portion 78 a extends from the lower horizontal plate portion 54 d to the lower surface portion 42 b side of the air conditioning duct 32, and is sandwiched between the lower surface portion 42 b and the upper surface of the spacer member 77. The vertical plate portion 78 b is fixed to the inner side surface of the spacer member 77 (specifically, the opposing surface of the spacer members 77) with screws 82. Thus, the air conditioning duct 32 is fixed to the spacer member 77 and thus to the ceiling frame 75 via the connection bracket 53 and the fixing bracket 78.

  Next, an operation procedure when the air conditioning duct 32 is installed in the ceiling space 21 (specifically, the lower space portion 21b) will be described.

  As described above, the building 10 of the present embodiment is a unit type building in which a plurality of building units are coupled to each other, and each of these building units is manufactured in advance in a manufacturing factory and transported to a construction site. At the construction site, first, an operation of installing each of the building units at a predetermined installation position is performed.

  After installing each building unit, installation work for installing the air conditioning duct 32 is performed. In the installation work, first, the work of assembling the ceiling frame 75 and the spacer member 77 to the ceiling part of the hallway 12 is performed. The ceiling frame 75 and the spacer member 77 may be assembled to the building unit in advance at the manufacturing factory.

  Thereafter, an operation of installing the air conditioning duct 32 on the spacer member 77 is performed. Here, it is assumed that such installation work is performed from under the ceiling (that is, from the side of the hallway 12). When installing the air conditioning duct 32, the duct portions 42 constituting the air conditioning duct 32 are sequentially placed on the spacer member 77 and the duct portions 42 are connected to each other by the connecting bracket 53.

  When the duct part 42 is placed on the spacer member 77, the duct part 42 is lifted and placed on the spacer member 77 through the frame of the ceiling frame 75. Since the duct part 42 is formed of polystyrene foam and is relatively light, the duct part 42 can be easily lifted.

  When the duct portions 42 (42A, 42B) are connected to each other by the connecting bracket 53, the connecting bracket 53 is first hooked on the protruding portions 51A, 51B of the duct portions 42A, 42B. Specifically, the upper horizontal plate portion 54b of the connecting bracket 53 is hooked in a state of being placed on the upper surfaces 51c of the protruding portions 51A and 51B. At this time, the connection bracket 53 (specifically, the vertical plate portion 54a) is not bent by the bent portion 61 (the state shown in FIG. 4A). However, at this time, the vertical plate portion 54a may be bent slightly downward with respect to the upper horizontal plate portion 54b.

  Subsequently, the connecting bracket 53 is bent at the bending portion 61 so that the connecting bracket 53 is wound around the projecting portions 51A and 51B of the duct portions 42A and 42B (the state shown in FIG. 4B). And each connection end part 55a, 55b of the connection bracket 53 is connected with the bis | screw 64 in the winding state. Thereby, the connection bracket 53 is attached in the state wound around each protrusion part 51A, 51B.

  Here, since each connection end part 55a, 55b is inclined downwardly from the winding part 54, it is possible to relatively easily connect the connection end parts 55a, 55b with the screw 64 even from under the ceiling. It has become. For example, when the connecting end portions 55a and 55b extend directly below the winding portion 54, the connecting end portions 55a and 55b are fastened from the side of the connecting end portions 55a and 55b. It is considered that the work is performed at a relatively high position, and the work is difficult. On the other hand, in the case where the connecting end portions 55a and 55b extend right side from the winding portion 54, the fastening operation of the connecting end portions 55a and 55b from the bottom of the ceiling is a work directed directly upward. However, it seems difficult to work. In that respect, in the configuration in which the connecting end portions 55a and 55b are inclined downward from the winding portion 54, the fastening operation is performed obliquely upward, so that the fastening operation is easier than the above cases, and the duct portion 42A, 42B can be easily connected.

  Moreover, since each connection end part 55a, 55b inclines below in the direction which opposes the lower surface of the lower side horizontal board part 54d of the winding part 54, when fastening each connection end part 55a, 55b from the downward | lower direction with the bis | screw 64 It is possible to suppress the upper connecting end 55b from being pushed upward by the screw 64 and escaping. This makes it easier to fasten the connecting end portions 55a and 55b from under the ceiling, and further facilitates the connecting work of the duct portions 42A and 42B from under the ceiling.

  In this way, the air conditioning duct 32 is constructed by sequentially connecting the duct portions 42. Thereafter, the second ceiling member 24 is attached to the ceiling frame 75. Thereby, the installation work of the air-conditioning duct 32 in the ceiling space 21 is completed.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  Protruding portions 51A and 51B that face each other are provided on side surface portions 42c of adjacent duct portions 42A and 42B, and a connecting bracket 53 that connects the duct portions 42A and 42B is attached to the protruding portions 51A and 51B. Specifically, the connecting bracket 53 is connected to a winding portion 54 wound around each of the projecting portions 51A and 51B in a state where the projecting portions 51A and 51B facing each other are collectively surrounded, thereby connecting the connecting bracket 53 to each other. A pair of connecting end portions 55 attached to each of the protruding portions 51A and 51B is configured. And since a pair of connection end part 55 was extended toward the outer side of the winding part 54, and each connection end part 55 was connected on the said outer side, adjacent duct parts 42A and 42B are fastened with fasteners, such as a volt | bolt. Compared with the case where it does, duct part 42A, 42B can be connected, suppressing that excessive force (for example, tightening force) acts on duct part 42A, 42B. Thereby, in the duct structure in which the air-conditioning duct 32 is configured by connecting the plurality of duct parts 42 to each other, it is possible to prevent the duct part 42 from being damaged.

  In particular, since the duct portion 42 is formed of foamed polystyrene to enhance the heat insulation performance, the strength thereof is low. When the duct portions 42A and 42B are to be connected by fastening with a fastener such as a bolt, the duct portion 42A is used. 42B is highly likely to be damaged. In this respect, since the duct portions 42A and 42B are connected to each other by the connection bracket 53, the duct portions 42A and 42B are made of styrene foam, and the duct portions 42A and 42B are suppressed from being damaged, and the duct portions 42A and 42B are suppressed. Can be connected to each other.

  The winding portion 54 is provided with a bending portion 61 for bending the winding portion 54, and the winding portion 54 is bent by the bending portion 61 so that the winding portion 54 is deformed into a shape to be wound around each of the projecting portions 51 </ b> A and 51 </ b> B facing each other. I did it. Thereby, since the winding part 54 can be easily wound around each protrusion part 51A, 51B, attachment of the connection bracket 53 to each protrusion part 51A, 51B and by extension, connection work of duct part 42A, 42B is easy. Can be performed.

  A groove 58 is formed in a part of the winding surface (specifically, the side surface 51b) around which the winding portion 54 is wound in each of the projecting portions 51A and 51B facing each other, and the winding portion 54 (specifically, each of the vertical plate portions 54a and 54c). ) Is provided with a flange portion 57a that enters and engages with the groove portion 58. Then, by engaging the flange portion 57a with the groove portion 58, the displacement of the winding portion 54 toward the projecting side of the projecting portions 51A and 51B and thus the displacement of the connecting bracket 53 is regulated. Thereby, since it can prevent that the connection bracket 53 remove | deviates from each protrusion part 51A, 51B, the connection state of duct part 42A, 42B can be maintained reliably.

  Since the flange portion 57a is formed so as to extend along the longitudinal direction of the vertical plate portions 54a and 54c (in other words, the winding direction of the winding portion 54), the winding direction of the winding portion 54 (specifically, the vertical plate portions 54a and 54c) The (bending) strength in the orthogonal direction (inner and outer directions of the winding portion 54) can be increased. That is, in this case, the winding portion 54 can be reinforced using the flange portion 57a for restricting the displacement of the winding portion 54. Thereby, since it can suppress that the winding part 54 wound around protrusion part 51A, 51B bends outside and winding is loosened, maintaining the connection state of duct part 42A, 42B more reliably. Can do.

  Grooves 58 are formed on the side surfaces 51b facing each other in the projecting portions 51A and 51B, in other words, the side surfaces 51b facing each other in the connecting direction in which the duct portions 42A and 42B are connected to each other, and the vertical plate portions of the winding portion 54 are formed. 54a and 54c are provided with flange portions 57a that engage with the respective groove portions 58. In this case, it is possible to increase the bending strength of each of the vertical plate portions 54a and 54c disposed on both sides of the protruding portions 51A and 51B in the connecting direction of the duct portions 42A and 42B. Therefore, it can suppress that the winding part 54 spreads in the connection direction (in other words, connection release direction) of the duct parts 42A and 42B, and the winding is loosened. As a result, the connection state between the duct parts 42A and 42B is preferable. Can be maintained.

  Since the groove portions 58 are formed in the respective protrusion portions 51A and 51B and the flange portions 57a of the winding portion 54 are engaged with the respective groove portions 58, the connecting bracket 53 is detached from each of the protrusion portions 51A and 51B. Can be prevented. Thereby, the connection state of duct part 42A, 42B can be maintained more reliably.

  The air conditioning duct 32 was fixed to the spacer member 77 (and thus the building 10) via the connection bracket 53. In this case, since the connection bracket 53 for connecting the duct portions 42A and 42B can be used as a base for fixing the air conditioning duct 32 to the building 10, the connection bracket 53 can be multi-functionalized. .

  Moreover, it is thought that it is difficult to attach the fixing bracket for fixing the air-conditioning duct 32 to the building 10 in the duct part 42 formed with the polystyrene foam. For example, if the fixing bracket is to be attached to the duct portion 42 with a fastener such as a screw, the duct portion 42 may be damaged. In that respect, in the configuration in which the air conditioning duct 32 is fixed to the building 10 via the connection bracket 53, the air conditioning duct 32 can be fixed to the building 10 while avoiding such damage.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the above embodiment, the connecting bracket 53 is attached to the projecting portions 51A and 51B provided on the side surface portions 42c of the adjacent duct portions 42A and 42B, but instead of or in addition to this, the adjacent duct portion 42A. , 42B are provided with protrusions 51A, 51B on the upper surface part 42a and the lower surface part 42b, respectively, and the connection bracket 53 is attached to the protrusions 51A, 51B of the upper surface part 42a and the protrusions 51A, 51B of the lower surface part 42b. It may be.

  (2) In the above embodiment, the bent portion 61 is formed by the pair of cuts 62, but the bent portion 61 is not necessarily formed by the cuts 62. For example, it is conceivable that a concave portion (groove portion) is provided on the plate surface of the winding portion 54 along the boundary portion between the vertical plate portion 54a and the upper horizontal plate portion 54b, and the bent portion 61 is formed by the concave portion. In other words, it is conceivable to form the bent portion 61 by reducing the thickness of the winding portion 54 only at the boundary portion.

  Further, the bent portion 61 is not necessarily provided at the boundary portion between the vertical plate portion 54a and the upper horizontal plate portion 54b, but the boundary between other plate portions such as the boundary portion between the vertical plate portion 54c and the upper horizontal plate portion 54b. You may provide in a part.

  Further, the bent portion 61 may not be provided in the winding portion 54. Even in that case, if the winding part 54 is bent using a tool or the like, it is possible to wind the winding part 54 around the projecting parts 51A and 51B.

  (3) In the above embodiment, the connection end portions 55a and 55b of the connection bracket 53 are provided so as to be inclined downward from the winding portion 54 in a direction facing the lower surface of the winding portion 54 (lower side plate portion 54d). By changing this, the connecting end portions 55a and 55b may be inclined downward so as not to face the lower surface of the winding portion 54. That is, the connecting end portions 55a and 55b may be inclined downward so that the connecting end portions 55a and 55b and the lower lateral plate portion 54d form an obtuse angle. Even in that case, since it is possible to facilitate the operation of fastening the connecting end portions 55a and 55b with the screws 64 from under the ceiling, the connecting operation of the duct portions 42A and 42B from under the ceiling can be facilitated. .

  Further, the connecting end portions 55 a and 55 b may be provided so as to extend right side from the winding portion 54, or may be provided so as to extend right below from the winding portion 54. Even in those cases, it is possible to fasten the connecting end portions 55a and 55b with screws 64 from under the ceiling.

  (4) In the above embodiment, the vertical plate portions 54a and 54c of the winding portion 54 are provided with a pair of flange portions 57a and 57b, respectively, but of the pair of flange portions 57a and 57b, the flange portion 57a (engagement protrusion) is provided. Part) may be provided. Even in this case, since the flange portion 57a is engaged with the groove portion 58, the displacement of the connecting bracket 53 toward the protruding side of the protruding portions 51A and 51B can be restricted.

  Moreover, in the said embodiment, although the flange part 57a (engagement protrusion) was formed so that it might extend along the up-down direction (in other words, winding direction of the winding part 54) of the vertical board parts 54a and 54c, an engagement protrusion May be formed along the width direction of the vertical plate portions 54a and 54c. Even in this case, if the groove 51 that engages the engaging protrusion is formed on the side surface 51b of the protrusions 51A and 51B, the displacement of the connecting bracket 53 to the protrusion side of the protrusions 51A and 51B can be restricted.

  (5) In the above-described embodiment, the flanges 57a and 57b are provided on the vertical plate portions 54a and 54c, respectively. However, only one of the vertical plate portions 54a and 54c has a flange portion only on the vertical plate portion 54a (54b). 57a and 57b may be provided. Further, instead of or in addition to providing the flange portions 57a and 57b on the vertical plate portions 54a and 54c, the flange portions 57a and 57b are provided on one or both of the upper horizontal plate portion 54b and the lower horizontal plate portion 54d. You may make it provide. When the flange portions 57a and 57b are provided on the upper lateral plate portion 54b, a groove portion 58 that engages the flange portion 57a is formed on the upper surface 51c of the projecting portions 51A and 51B. Moreover, when providing the flange parts 57a and 57b in the lower side horizontal board part 54d, the groove part 58 with which the flange part 57a is engaged is formed in the lower surface 51d of protrusion part 51A, 51B. Also in these cases, the displacement of the connecting bracket 53 toward the projecting side of the projecting portions 51A and 51B can be restricted.

  Further, when the flange portions 57a and 57b are provided on the upper horizontal plate portion 54b or the lower horizontal plate portion 54d, if the flange portions 57a and 57b are provided so as to extend in the winding direction of the winding portion 54, they are orthogonal to the winding direction. It is possible to increase the (bending) strength of the winding portion 54 in the direction in which the winding is performed.

  (6) In the above embodiment, the flange portion 57a (engagement protrusion) of the winding portion 54 is engaged with the groove portion 58 of the protrusions 51A and 51B, thereby connecting the protrusions 51A and 51B toward the protrusion side. Although the displacement of the bracket 53 is regulated, the configuration for regulating the displacement is not necessarily limited to this. For example, the flange portions 57a and 57b are not provided on the winding portion 54, and instead, a protrusion that can be engaged with the winding portion 54 (specifically, the outer end portion in the width direction) on the winding surface of the protruding portions 51A and 51B. It is conceivable to provide a portion (corresponding to the engaged portion). Also in that case, the winding part 54 engages with the convex part, so that the displacement of the connecting bracket 53 toward the projecting side of the projecting parts 51A and 51B can be restricted.

  (7) In the above embodiment, the opposing protrusions 51A and 51B are formed in a rectangular parallelepiped shape as a whole. However, the opposing protrusions 51A and 51B may be formed in other shapes such as a cylindrical shape as a whole. . For example, when each of the projecting portions 51A and 51B facing each other is formed in a columnar shape, the winding portion 54 of the connection bracket 53 may be formed in an annular shape in accordance with it.

  (8) In the above embodiment, the duct structure of the present invention is applied to the duct portion 42 formed of foamed polystyrene. However, the duct structure formed of a resin material other than foamed polystyrene, a metal material, or the like is used. You may apply this invention to a duct part.

  Moreover, in the said embodiment, although this invention was applied to the rectangular cylindrical duct part 42, you may apply this invention to duct parts of other shapes, such as a cylindrical shape. Even in a cylindrical duct portion, adjacent duct portions can be connected to each other by providing protruding portions facing each other on the outer peripheral surface of adjacent duct portions and attaching a connecting bracket 53 to the facing protruding portions.

  (9) In the above embodiment, the duct structure of the present invention is applied to the air conditioning duct 32 through which the conditioned air generated by the air conditioner 31 flows. However, the air that is discharged from the building to the outside or taken into the building from the outside The present invention may be applied to other ventilation ducts such as a flowing ventilation duct.

  (10) In the above embodiment, the air conditioning duct 32 is installed in the ceiling space 21 (lower space portion 21b) of the building 10. However, the air conditioning duct 32 may be installed in an underfloor space or a wall space. For example, when the air conditioning duct 32 is installed in a wall space, it is conceivable that the duct portions 42 are installed so as to be aligned vertically. Further, the air conditioning duct 32 is not necessarily installed in the building 10, and for example, a part or all of the air conditioning duct 32 may be installed outdoors.

  (11) Although the application example to the unit type building has been described in the above embodiment, the present invention can be applied to a building having another structure such as a building constructed by a steel frame assembling method.

  DESCRIPTION OF SYMBOLS 10 ... Building, 21 ... Ceiling space, 30 ... Air-conditioning equipment, 32 ... Air-conditioning duct as a ventilation duct, 33 ... Blowing chamber, 42 ... Duct part, 49 ... Airtight member, 51A, 51B ... Projection part, 53 ... Connecting tool Connection bracket as 54, winding part, 55 ... connection end part, 57 ... flange part as engagement protrusion, 58 ... groove part as engaged part, 62 ... bent part, 64 ... screw as fastener.

Claims (9)

It has a ventilation duct through which air flows,
The ventilation duct is configured by connecting a plurality of duct portions arranged along the ventilation path of the ventilation duct,
Protruding portions facing each other are provided on the outer peripheral surfaces of the adjacent duct portions,
Each of the protruding portions facing each other is disposed at a plurality of locations along a boundary portion between the adjacent duct portions,
Each of the opposing projecting portions is attached with a long connector that connects the adjacent duct portions to each other,
The connector is a winding portion provided so as to be wound around each projecting portion in a state where the projecting portions facing each other are collectively surrounded,
A pair of connecting end portions that extend from both ends of the winding portion toward the outside of the winding portion and are connected to each other to attach the connecting tool to the protrusions;
The duct structure characterized by having.   The winding part has a bending part for bending the winding part, and can be deformed into a shape to be wound around each of the opposing projecting parts by being bent at the bending part. The duct structure according to 1. The ventilation duct is arranged so that the duct portions are arranged side by side in the ceiling space in the building,
In the adjacent duct parts, the opposing projecting parts are respectively provided on the side parts on both sides of the duct parts,
The connector is attached to each of the opposing protrusions on the side portions on both sides of the duct portions,
3. The duct structure according to claim 2, wherein the pair of connecting end portions extend downwardly from the winding portion and are fastened from below by a fastener in a state of being overlapped with each other.   The duct structure according to claim 3, wherein the pair of connecting end portions are inclined downward from the winding portion in a direction facing the lower surface of the winding portion. An airtight member having elasticity is interposed between the adjacent duct portions,
5. The airtight member is in a compressed state between the duct portions when the adjacent duct portions are connected by the connector. 5. Duct structure. In each of the opposing projecting portions, a winding surface around which the winding portion is wound is provided with an engaged portion with which the winding portion is engaged,
The said winding part is engaged with the said to-be-engaged part, and the displacement to the protrusion side of the said protrusion part which opposes is controlled, The Claim 1 thru | or 5 characterized by the above-mentioned. Duct structure. The winding surface is formed with a groove as the engaged portion,
The winding portion is provided with an engaging protrusion that protrudes toward the groove and engages with the groove.
The duct structure according to claim 6, wherein the groove portion and the engagement protrusion are formed so as to extend along a winding direction of the winding portion, respectively.   The duct structure according to any one of claims 1 to 7, wherein the ventilation duct is installed in a building and is fixed to the building via the connector.   The duct structure according to any one of claims 1 to 8, wherein the duct portion is made of foamed polystyrene.

Images