Ductwork installation method and vertical attachment

Abstract

This invention provides a ductwork installation method and vertical attachment that can reduce the burden on workers at heights and ensure their safety. [Solution] In the vertical attachment installation process K12, the main body 28 of the vertical attachment 26 is fixed to the right side 20d of the vertical duct unit 20, so that the right hook portions 30R(1) and 30R(2) protrude laterally beyond the back surface 20c at a distance along the length of the vertical duct unit 20, and the open ends of the right hook portions 30R(1) and 30R(2) are positioned toward the lower end 20f. Furthermore, the main body 28 of the vertical attachment 26 is fixed to the left side 20b of the vertical duct unit 20, so that the left hook portion 30L(1) protrudes laterally beyond the back surface 20c at a position corresponding to the right hook portions 30R(1) and 30R(2), and the open end of the left hook portion 30L(1) is positioned toward the lower end 20f.

Description

Technical Field

[0001] The present invention relates to a duct device installation method used when installing a duct device in a building such as a factory, and a vertical attachment used therefor.

Background Art

[0002] When installing an air-conditioning duct device in a building such as a factory, in order to effectively utilize the space inside the building without waste, the duct device is often laid out along the inner surface of the wall or ceiling and installed on the steel frame structure that supports the building. However, when installing a large duct device in a large building with a ceiling height of 15 m or more, there is a problem that the construction work takes a very long time.

[0003] Furthermore, since the length and layout of the duct device vary for each project, usually, it is formed by connecting cylindrical parts of about 0.5 to 2 m in the length direction. Therefore, a duct unit in which a predetermined number of cylindrical parts are assembled in advance on the ground is manufactured, and the work of fixing the temporarily assembled duct unit manufactured on the ground to the specified position of the steel frame structure during the steel frame construction of the building has been carried out.

[0004] In addition, for example, in Patent Documents 1 and 2, methods for efficiently performing the work of installing a duct unit manufactured on the ground on a building structure such as a steel frame structure have been proposed. In FIGS. 7 to 9 of Patent Document 1, a method of installing a duct unit (vertical duct unit) arranged in the vertical direction on a beam steel frame using a predetermined bracket is disclosed. Patent Document 2 discloses a method of supporting a duct unit (long body) arranged in the horizontal direction by a long body support attached to a building structure.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] The conventional method of installing duct units into steel-framed building structures required coordinating the installation with the construction of the building's steel frame, necessitating coordination between the steel frame construction and the duct unit installation, resulting in a time-consuming and labor-intensive process.

[0007] Furthermore, the construction method described in Patent Document 1 involves inserting bolts provided on the steel frame side into through holes provided in the brackets of the vertical ducts to connect and fix them, which is difficult and time-consuming to perform, and the mounting strength is low. The construction method described in Patent Document 2 involves fixing support brackets to the building structure and providing retaining brackets that clamp the ducts to the support brackets, but the installation of the ducts requires time to install each bracket, and the work of clamping and fixing the ducts with a pair of retaining brackets also requires time, resulting in poor workability.

[0008] This invention has been made in view of the above-mentioned background technology, and aims to provide a duct device installation method and vertical attachment that enable efficient construction, reduce the burden on workers at heights, and provide high safety. [Means for solving the problem]

[0009] The invention described in claim 1 is a duct installation method for installing a duct system inside a building, wherein the duct system in question is a portion installed vertically inside the building, and comprises a vertical duct section installed on a plurality of wall-side beam steel frames arranged at vertical intervals on the inner surface of the side wall of the building.

[0010] Furthermore, the invention described in claim 1 includes a vertical attachment preparation step of preparing a vertical attachment having a main body and a hook portion extending from the end of the main body and protruding laterally from the main body, A vertical duct unit manufacturing process involves connecting multiple rectangular tubular parts in the longitudinal direction to create a vertical duct unit that forms part of the vertical duct section, A vertical attachment installation step is performed such that, when the four sides of the vertical duct unit are sequentially continuous in the circumferential direction, they are the front, left, back, and right sides, and the two ends in the longitudinal direction are the upper end and lower end, the main body of the vertical attachment is fixed to the right side of the vertical duct unit so that the multiple right hooks, which are the multiple hooks, each protrude laterally beyond the back at positions separated in the longitudinal direction of the vertical duct unit, and the open ends of the right hooks are positioned toward the lower end, and the main body of the vertical attachment is fixed to the left side of the vertical duct unit so that the multiple left hooks, which are the multiple hooks, each protrude laterally beyond the back at positions corresponding to the multiple right hooks, and the open ends of the left hooks are positioned toward the lower end, A process performed after the vertical duct unit manufacturing process and the vertical attachment installation process, comprising: a vertical duct unit installation process in which the vertical duct unit is lifted with its upper end facing upward, the left hook portion and the right hook portion are hooked onto the wall-side beam steel frame to temporarily hold the vertical duct unit, and then the left hook portion and the right hook portion are fixed to the wall-side beam steel frame, respectively, using a first fixing device; The duct system installation method comprises a vertical duct unit connection step, in which the vertical duct unit installed in the vertical duct unit installation step is connected to other components constituting the duct system.

[0011] In the vertical duct unit manufacturing process, it is preferable to have a configuration that includes a rectangular tubular part connecting process in which the ends of the rectangular tubular parts in the longitudinal direction are connected to each other, and an insulating material coating process in which the outer surface of the rectangular tubular part and the connection portion with other rectangular tubular parts are covered with insulating material. Furthermore, it is preferable that the vertical attachment prepared in the vertical attachment preparation process has a plurality of hook portions extending from the end of one long main body portion.

[0012] The hook portion of the vertical attachment prepared in the vertical attachment preparation step consists of a horizontal part made of a square pipe whose base end is fixed to the main body, a first vertical part made of a square pipe whose one end is fixed to one side of the base end of the horizontal part and extends in a direction intersecting the horizontal part, and a second vertical part made of a square pipe whose one end is fixed to the surface of the tip of the horizontal part that intersects with the one side and faces the first vertical part, and the first fixing device used in the vertical duct unit installation step is a length corresponding to the first vertical part The system consists of a movable vertical part made of a square pipe and a first fastening fitting having a bolt member and a nut member. In the vertical duct unit installation process, it is preferable to temporarily hold the vertical duct unit to the wall-side beam steel frame, position the movable vertical part near the second vertical part, and connect the two ends of the movable vertical part and the two ends of the first vertical part using two sets of the first fastening fittings, and then fasten them so that the wall-side beam steel frame is sandwiched between the first vertical part and the movable vertical part.

[0013] Furthermore, the invention described in claim 5 is a duct installation method for installing a duct device inside a building, wherein the duct device in question is a portion installed laterally inside the building, and comprises a horizontal duct section installed on a plurality of ceiling-side steel beams arranged at horizontal intervals on the inner surface of the building's ceiling. Furthermore, the invention described in claim 5 includes a lateral attachment preparation step of preparing a lateral attachment having a pair of elongated frames and a plurality of connecting frames that connect the pair of elongated frames in a ladder-like manner, A process for manufacturing a horizontal duct unit, which involves connecting multiple rectangular tubular parts in the longitudinal direction to create a horizontal duct unit that becomes part of the horizontal duct section, A lateral attachment installation step is performed such that, when the four sides of the lateral duct unit are sequentially continuous in the circumferential direction, they are the top, left, bottom, and right sides, the lateral attachment is fixed to the lateral duct unit using a second fixing device, so that the multiple connecting frames abut against the bottom surface of the lateral duct unit, and specific parts of the lateral attachment, including a pair of left and right elongated frames, protrude beyond the left or right side of the lateral duct unit, respectively. A step performed after the horizontal duct unit manufacturing step and the horizontal attachment installation step, comprising: a horizontal duct unit installation step in which the horizontal duct unit is lifted with the horizontal attachment positioned below it, and the left and right specific parts of the horizontal attachment are suspended and fixed to the ceiling beam steel frame using a suspension device; This duct system installation method comprises a horizontal duct unit connection step, in which the horizontal duct unit installed in the horizontal duct unit installation step is connected to other components constituting the duct system.

[0014] In the process of manufacturing the horizontal duct unit, it is preferable to have a configuration that includes a rectangular tubular part connecting step in which the ends of the rectangular tubular parts in the longitudinal direction are connected to each other, and an insulating material coating step in which the outer surface of the rectangular tubular part and the connection portion with other rectangular tubular parts are covered with insulating material.

[0015] The second fastener used in the lateral attachment installation process is preferably composed of a movable frame having a length corresponding to the connecting frame and a second tightening fitting having a bolt member and a nut member. In the lateral attachment installation process, the movable frame is positioned above the upper surface of the lateral duct unit with the lower surface of the lateral duct unit in contact with one side of the lateral attachment, and the two ends of the movable frame are connected to the left and right specific parts of the lateral attachment using two sets of the second tightening fittings, and the lateral duct unit is clamped between the lateral attachment and the movable frame by tightening the connections.

[0016] The suspension device used in the horizontal duct unit installation process preferably comprises a suspension bolt, an upper support fitting having a threaded portion that screws onto one end of the suspension bolt and an upper fixing portion that can be fixed to the ceiling-side beam reinforcement, and a lower support fitting having a threaded portion that screws onto the other end of the suspension bolt and a lower fixing portion that can be fixed to the specific part of the horizontal attachment.

[0017] Furthermore, the invention described in claim 9 is a vertical attachment used when installing a vertical duct unit, which is made up of multiple rectangular tubular parts connected in the longitudinal direction, on multiple wall-side beam steel frames that are attached at vertical intervals opposite to the inner surface of the side wall of a building, The device comprises a long main body and a plurality of hook portions extending from the ends of the main body and protruding laterally from the main body. The main body is shaped to be attachable to both the left and right sides of the vertical duct unit, when the four circumferentially continuous sides of the vertical duct unit are designated as the front, left, back, and right sides, and the two ends in the longitudinal direction are designated as the upper and lower ends. The hook portions are shaped to be hooked onto the wall-side beam steel frame. The multiple hook portions are vertical attachments provided such that, with the main body portion attached to the right or left side of the vertical duct unit, they are positioned at separate locations along the length of the vertical duct unit, each protruding laterally beyond the rear surface of the vertical duct unit, and each having an open end positioned toward the lower end of the vertical duct unit.

[0018] Furthermore, the hook portion is provided with a first fixing device for fixing it to the wall-side beam steel frame. The hook portion is composed of a horizontal part made of a square pipe whose base end is fixed to the main body, a first vertical part made of a square pipe whose one end is fixed to one side of the base end of the horizontal part and extends in a direction intersecting the horizontal part, and a second vertical part made of a square pipe whose one end is fixed to the surface of the tip of the horizontal part that intersects with the one side and faces the first vertical part. The first fixture is composed of a movable vertical part made of a square pipe having a length corresponding to the first vertical part, and a first tightening fitting having a bolt member and a nut member. With the hook portion hooked on the wall side beam steel frame, the movable vertical part is arranged near the second vertical part, and two ends of the movable vertical part and two ends of the first vertical part are respectively connected and tightened by using two sets of the first tightening fittings, so that it is preferable to have a configuration in which the wall side beam steel frame can be sandwiched between the first vertical part and the movable vertical part.

Effect of the Invention

[0019] In the duct device installation method of the present invention, since the vertically drawn duct unit is formed on the ground in advance and a unique vertical attachment is attached, the operation of lifting the vertically drawn duct unit and installing it on the wall side beam steel frame is very easy. Also, since the horizontally drawn duct unit is formed on the ground in advance and a horizontal attachment is attached to the horizontally drawn duct unit, the operation of installing the horizontally drawn duct unit on the ceiling side beam steel frame is very easy. Therefore, efficient construction is possible, the burden on high-altitude workers is reduced, and the safety is high.

Brief Description of the Drawings

[0020] [Figure 1] It is a perspective view (a) showing a steel frame structure where a duct device is installed, and a perspective view (b) showing a duct device installed on the steel frame structure. [Figure 2] It is a perspective view showing a vertically drawn duct portion and a vertically drawn duct unit, a horizontally drawn duct portion, and a horizontally drawn duct unit that constitute a duct device. [Figure 3] It is a view showing an embodiment of the duct device installation method of the present invention, and is a flowchart (a) showing the installation method of the vertically drawn duct portion and a flowchart (b) showing the installation method of the horizontally drawn duct portion. [Figure 4]The images show a front view (a) of the vertical attachment (one embodiment of the vertical attachment of the present invention) prepared in the vertical attachment preparation step, a left side view (b) showing an enlarged view of the upper hook portion, and a left side view (c) showing an enlarged view of the lower hook portion. [Figure 5] The images show a front view (a) of a vertical duct unit manufactured in the vertical duct unit manufacturing process and a horizontal duct unit manufactured in the horizontal duct unit manufacturing process, a cross-sectional view (b) showing an example of the structure of part A, which is the connecting part between rectangular tubular parts, and a cross-sectional view (c) showing another example of the structure of part A. [Figure 6] The images show the vertical attachment installed on the vertical duct unit after the vertical attachment installation process (front view (a) and left side view (b)). [Figure 7] These are front views (a) and (b) illustrating the steps involved in the vertical duct unit installation process, from lifting the vertical duct unit to hooking the hook portion onto the wall-side beam reinforcement. [Figure 8] These are front views (a) and (b) showing the state in which the hook portion is fixed to the wall-side beam reinforcement using the first fixing device during the vertical duct unit installation process. [Figure 9] This is a plan view showing the lateral attachment to be prepared in the lateral attachment preparation process. [Figure 10] The plan view (a) and left side view (b) show the state after the horizontal attachment installation process has been carried out and the horizontal attachment has been installed on the horizontal duct unit. [Figure 11] The left side view (a) shows the horizontal duct unit being lifted up to the vicinity of the ceiling-side beam steel frame during the horizontal duct unit installation process, and the left side view (b) shows the horizontal attachment being suspended and fixed to the ceiling-side beam reinforcement using a suspension device. [Modes for carrying out the invention]

[0021] The following describes preferred embodiments and modified examples of the duct installation method and vertical attachment of the present invention. <<<Structure of duct system 10 and steel frame structure 12>>> Before explaining the duct system installation method, we will first briefly describe the structure of the duct system 10 that can be installed using this method, and the structure of the steel frame structure 12 on which the duct system 10 is installed. Figure 1(a) shows the steel frame structure 12 that supports the building 14, which has a roughly rectangular parallelepiped shape. The steel frame structure 12 is a hollow structure with a roughly rectangular parallelepiped shape formed by assembling long H-shaped steel beams, and has multiple wall-side beam steel frames 12k arranged vertically at intervals on the inner surface of one side wall of the building, and multiple ceiling-side beam steel frames 12t arranged horizontally at intervals on the inner surface of the ceiling of the building. As shown in Figures 1(a) and (b), the duct system 10 is installed inside the steel frame structure 12.

[0022] As shown in Figure 2, the ducting device 10 has a vertical duct section 16 that is installed on the wall-side beam reinforcement 12k and extends vertically, and a horizontal duct section 18 that is installed on the ceiling-side beam reinforcement 12t and extends horizontally. The vertical duct section 16 is formed by connecting vertical duct units 20 of a predetermined length with connecting cylindrical parts 24, and the horizontal duct section 18 is formed by connecting horizontal duct units 22 of a predetermined length to each other. Furthermore, the ducting device 10 is formed by connecting the vertical duct section 16 and the horizontal duct section 20 with connecting cylindrical parts 24.

[0023] <<<An embodiment of the duct installation method and vertical attachment of the present invention>>> The duct system installation method in this embodiment generally consists of an installation method for the vertical duct section 16 and an installation method for the horizontal duct section 18. Each installation method will be described in turn below.

[0024] <<Installation method for vertical duct section 16>> First, the installation method for the vertical duct section 16 will be explained. As shown in Figure 3(a), the installation method for the vertical duct section 16 consists of a vertical attachment preparation step K11, a vertical duct unit manufacturing step K12, a vertical attachment installation step K13, a vertical duct installation step K14, and a vertical duct unit connection step K15. <Vertical attachment preparation process K11> In the vertical attachment preparation step K11, the vertical attachment 26 shown in Figures 4(a) to (c) is prepared. This vertical attachment 26 has a main body 28 made of a long square pipe or the like, and two hook portions 30(1) and 30(2) are extended from both ends of the main body 28, projecting outwards to the sides of the main body 28.

[0025] The hook portion 30(1) has a U-shape with one end open and is composed of a horizontal part 32(1) made of a square pipe, a first vertical part 34(1), and a second vertical part 36(1). The horizontal part 32(1) is fixed to the end face of one end of the main body 28 by welding or other means, and in the front view in Figure 4(a), it protrudes downward at a right angle to the main body 28. The first vertical part 34(1) is fixed to one side of the base end [closer to the main body 28] of the horizontal part 32(1) by welding or other means, and in the left side view in Figure 4(b), it is positioned to the right of the horizontal part 32(1), and in the front view in Figure 4(a), it protrudes to the right at almost a right angle to the horizontal part 32(1). The second vertical part 36(1) is fixed by welding or other means to the end face of the tip of the horizontal part 32(1) [a position away from the main body 28], that is, one side of the tip of the horizontal part 32(1), which intersects with the side to which the first vertical part 34(1) is fixed. In the left side view of Figure 4(b), it is positioned below the horizontal part 32(1), and in the front view of Figure 4(a), it protrudes to the right at almost a right angle to the horizontal part 32(1). A characteristic of this structure is that the positional relationship between the first vertical part 34(1) and the second vertical part 36(1) is shifted to the left and right by the width dimension of the square pipe in the left side view of Figure 4(b).

[0026] Incidentally, the lateral part 32(1) has an auxiliary part 28a(1) continuously formed by extending the base end, and the auxiliary part 28a(1) protrudes from the main body 28 in the opposite direction to the lateral part 32(1) (upward in Figure 4(a)). The tip of the auxiliary part 28a(1) is fixed to the long square pipe of the main body 28 via the diagonal frame 28b(1), and the hook part 30(1) is reinforced by forming a triangular frame structure. The auxiliary part 28a(1) and the diagonal frame 28b(1) are part of the main body 28, and the main body 28 is also reinforced by forming this triangular frame structure.

[0027] The hook portion 30(2) has the same structure as the hook portion 30(1), and is composed of a horizontal part 32(2) made of a square pipe, a first vertical part 34(2), and a second vertical part 36(2). The open end of the hook portion 30(2) is positioned on the same side as the open end of the hook portion 30(1) (the right side in Figure 4(a)). The hook portion 30(2) and the main body portion 28 are reinforced by an auxiliary part 28a(2) and a diagonal frame 28b(2), which are part of the main body portion 28.

[0028] Thus, the vertical attachment 26 has a structure mainly composed of interconnected square pipes in order to ensure a certain level of strength while minimizing weight.

[0029] Furthermore, as shown in Figures 6(a) and (b), this vertical attachment 26 is used by attaching a pair to the left side 20b and right side 20d of the vertical duct unit 20. Therefore, the main body 28 is shaped to be attachable to both the left side 20b and the right side 20d, so that one type of vertical attachment 26 can be used for both. The method of using the vertical attachment 26 will be explained in detail later.

[0030] Although not shown in Figures 4(a) to 4(c), the vertical attachment 26 is also equipped with a first fastener 46. The first fastener 46 is a component for fixing the hook portions 30(1) and 30(2) to the wall-side beam steel frame 12k, respectively. As shown in Figures 8(a) and 8(b), it consists of a movable vertical part 46a made of a square pipe of a length corresponding to the first vertical part 34(1), and a first tightening fitting 46b having a bolt member and a nut member. The method of using the first fastener 46 will be explained in detail later.

[0031] <Vertical duct unit manufacturing process K12> The vertical duct unit manufacturing process K12 consists of the rectangular tubular part connecting process K121 and the insulation material coating process K122. By performing processes K121 and K122, the vertical duct unit 20 is manufactured. In the rectangular tubular parts connecting process K121, as shown in Figure 5(a), a predetermined number of rectangular tubular parts 38 are prepared and their ends in the longitudinal direction are connected to each other. For example, as shown in Figure 5(b), if an outward-facing flange portion 38a is formed at the end of a rectangular tubular part 38, in the rectangular tubular parts connecting process K121, the flange portions 38a of adjacent rectangular tubular parts 38 are connected by screwing them together. Then, in the insulation material covering process K122, the outer surface of each rectangular tubular part 38 and the connection portion with other rectangular tubular parts 38 are covered with a sheet-like insulation material 40. Here, since the flange portion 38a protrudes outward, the flat portion other than the flange portion 38a is covered with a large insulation material 40a, the flange portion 38a is covered with a long, narrow strip-shaped insulation material 40b, and the insulation material 40b is bonded and fixed to the insulation material 40a with a sealant 42.

[0032] Furthermore, as shown in Figure 5(c), an inward-facing flange portion 38b may be formed at the end of the rectangular tubular part 38. In this case as well, the rectangular tubular part connection process K121 and the insulation material coating process K122 are carried out in order, but since the flange portion 38b does not protrude outward, the entire structure can be simply covered with a large insulation material 40a in the insulation material coating process K122. Hereinafter, as shown in Figure 5(a), the four sides of the vertical duct unit 20 that are sequentially continuous in the circumferential direction will be referred to as the front 20a, left side 20b, back 20c, and right side 20d, and the two ends in the longitudinal direction will be referred to as the upper end 20e and lower end 20f.

[0033] <Vertical attachment installation process K13> In the vertical attachment installation process K13, the vertical attachments 26 described above are attached to the left side 20b and the right side 20d of the vertical duct unit 20, respectively. When attaching the vertical attachment 26 to the right side 20d of the vertical duct unit 20, as shown in Figures 6(a) and (b), the main body portion 28 (auxiliary portions 28a(1), 28a(2)) is fixed to the right side 20d using a screw member 44, so that the two hook portions 30(1), 30(2) protrude laterally beyond the back surface 20c at separate positions along the length of the vertical duct unit 22, and the open ends of the hook portions 30(1), 30(2) are positioned toward the lower end portion 20f. Hereinafter, the hook portions 30(1), 30(2) of the vertical attachment 26 attached to the right side 20d will be referred to as the right hook portion 30R(1), 30R(2).

[0034] When attaching the vertical attachment 26 to the left side 20b of the vertical duct unit 20, as shown in Figure 6(b), the main body 28 (auxiliary parts 28a(1), 28a(2)) is fixed to the left side 20b using a screw member 44, so that the two hook parts 30(1), 30(2) protrude laterally beyond the back surface 20c at positions corresponding to the right hook parts 30R(1), 30R(2), and the open ends of the hook parts 30(1), 30(2) are positioned toward the lower end 20f. If we consider the hook portions 30(1) and 30(2) of the vertical attachment 26 attached to the left side 20b as the left hook portions 30L(1) and 30L(2), then in Figure 6(a), the left hook portions 30L(1) and 30L(2) are not visible. However, in reality, the left hook portion 30L(1) is positioned so as to overlap the right hook portion 30R(1), and the left hook portion 30L(2) is positioned so as to overlap the right hook portion 30R(2).

[0035] As described above, the main body 28 and each hook portion of the vertical attachment 26 are reinforced by a triangular frame structure, so by attaching the main body 28 to the vertical duct unit 20, each hook portion can be stably fixed to the vertical duct unit 20. When fixing the auxiliary portions 28a(1) and 28a(2) of the vertical attachment 26 to the vertical duct unit 20 with screw members 44, it is preferable to directly fix the auxiliary portions 28a(1) and 28a(2) to the rectangular tubular part 38 and cover the auxiliary portions 28a(1) and 28a(2) together with the heat insulating material 40. Therefore, the vertical duct unit manufacturing process K12 and the vertical attachment installation process K13 should be carried out in parallel and in combination as shown in Figure 3(a).

[0036] <Vertical duct unit installation process K14> The vertical duct unit installation process K14 is performed after the vertical duct unit manufacturing process K12 and the vertical attachment installation process K13 have been completed. This process involves installing the vertical duct unit 20, to which the vertical attachment 26 has been attached, onto the wall-side beam steel frame 12k. First, as shown in Figure 7(a), the vertical duct unit 20 is lifted using a winch or a chain block equipped with a gear mechanism, with its upper end portion 20e positioned upwards. Then, as shown in Figure 7(b), the right hook portion 30R(1) and the left hook portion 30L(1) (not shown) are hooked onto the upper wall-side beam steel frame 12k(1), and the right hook portion 30R(2) and the left hook portion 30L(2) (not shown) are hooked onto the lower wall-side beam steel frame 12k(2) to temporarily hold the vertical duct unit 20 in place.

[0037] Subsequently, a worker riding in a crawler-type aerial work platform or the like uses the first fixing device 46 (movable vertical part 46a and first tightening fitting 46b) to fix the hook parts 30R(1) and 30L(1) to the wall-side beam steel frame 12k(1), and to fix the hook parts 30R(2) and 30L(2) to the wall-side beam steel frame 12k(2).

[0038] When fixing the right hook portion 30R(1) to the wall-side beam steel frame 12k(1), first, the movable vertical part 46a is positioned near the second vertical part 36(1). Specifically, one side of the movable vertical part 46a is brought into contact with one side of the second vertical part 36(1), positioning the movable vertical part 46a opposite the first vertical part 34(1). Then, the two ends of the movable vertical part 46a and the two ends of the first vertical part 34(1) are connected and tightened using two sets of first fastening fittings 46b, so that the wall-side beam steel frame 12k(1) is sandwiched between the first vertical part 34(1) and the movable vertical part 46a, resulting in the state shown in Figure 8(a). Thus, aligning the movable vertical part 46a with respect to the first vertical part 34(1) is very easy, and when the first fastening fitting 46b is tightened, the movable vertical part 46a moves smoothly along the side of the second vertical part 36(1), making installation easy. The same applies when fixing the left hook part 30L(1), which is not shown, to the wall-side beam steel frame 12k(1).

[0039] Similarly, when fixing the right hook portion 30R(2) to the wall-side beam steel frame 12k(2), as shown in Figure 8(b), the movable vertical portion 46a is placed near the second vertical portion 36(2), and the two ends of the movable vertical portion 46a and the two ends of the first vertical portion 34(2) are connected and tightened using two sets of first fastening fittings 46b, thereby clamping the wall-side beam steel frame 12k(2) between the first vertical portion 34(2) and the movable vertical portion 46a. The same applies when fixing the left hook portion 30L(2), which is not shown, to the wall-side beam steel frame 12k(2).

[0040] As shown in Figure 7(b), the vertical duct unit 20 is in a temporarily fixed state, but since the four hooks are securely engaged with the two wall-side beam steel frames, there is no need to worry about the vertical duct unit 20 falling off or being unexpectedly displaced while the worker at height is attaching the first fixing device 46. Furthermore, the work of attaching the first fixing device 46 is not a very complicated task and can be completed easily in a short time. Therefore, it is less burdensome for the worker at height and allows them to work safely.

[0041] Note that in Figures 7 and 8, the upper wall-side beam steel frame 12k(1) and the lower wall-side beam steel frame 12k(2) are shown as H-shaped steel of the same size, but in reality, they may be of different sizes. Therefore, when designing each hook section, it is advisable to consider the size and arrangement of the opposing wall-side beam steel frames 12k(1) and 12k(2) when determining the position of the first vertical parts 34(1), 34(1) relative to the main body 28, and the spacing between the first vertical parts 34(1), 34(2) and the second vertical parts 36(1), 36(2).

[0042] <Vertical duct unit connection process K15> In the vertical duct unit connection process K15, the vertical duct unit 20 installed in the vertical duct unit installation process K14 is connected to other components that make up the duct system 10. These other components include, for example, other vertical duct units 20 or horizontal duct units 22.

[0043] The vertical duct unit connection process K15 may be performed in combination with other processes. For example, when connecting the lower end of the vertical duct unit 20α and the upper end of the already installed vertical duct unit 20β with a connecting cylindrical part 24, it is preferable to connect one end of the connecting cylindrical part 24 to the upper end of the vertical duct unit 20β during the installation of the vertical duct unit 20β (for example, before the vertical duct installation process K14 for the vertical duct unit 20β), and then, after performing the vertical duct unit installation process K25 for the vertical duct unit 20α, connect the other end of the connecting cylindrical part 24 to the lower end of the vertical duct unit 20α. This makes the series of installation operations even more efficient.

[0044] <Summary of the installation method for the vertical duct section 16> As described above, the vertical duct section 16 shown in Figure 2 can be installed safely and efficiently by performing the vertical attachment preparation step K11, the vertical duct unit manufacturing step K12, the vertical attachment installation step K13, the vertical duct installation step K14, and the vertical duct unit connection step K15 described above.

[0045] <<Installation method for horizontal duct section 18>> Next, the installation method for the horizontal duct section 18 will be described. As shown in Figure 3(b), the installation method for the horizontal duct section 18 consists of a horizontal attachment preparation step K21, a horizontal duct unit manufacturing step K22, a horizontal attachment installation step K23, a horizontal duct installation step K24, and a horizontal duct unit connection step K25. <Lateral attachment preparation process K21> In the lateral attachment preparation step K21, the lateral attachment 48 shown in Figure 9 is prepared. This lateral attachment 48 has a pair of long frames 50L, 50R made of long square pipes. The long frames 50L and 50R are connected in a ladder-like manner by multiple connecting frames 52 made of square pipes. The lateral attachments 48 are constructed by assembling square pipes together to ensure a certain level of strength while minimizing weight. The length of the connecting frames 52 is longer than the width of the lateral duct unit 22.

[0046] In addition, although not shown in Figure 9, the lateral attachment 48 is equipped with a second fastener 54. The second fastener 54 is a component for fixing the lateral attachment 48 to the lateral duct unit 22, and as shown in Figures 10(a) and (b), it consists of a movable frame with a length corresponding to the connecting frame 52 and a second fastening fitting 54b having a bolt member and a nut member. The method of using the second fastener 54 will be explained in detail later.

[0047] <Process K22 for manufacturing horizontal duct units> The horizontal duct unit manufacturing process K22 consists of the rectangular tubular part connection process K221 and the insulation material coating process K222. The horizontal duct unit 22 is manufactured by performing processes K221 and K222. The contents of the rectangular tubular part connection process K221 and the insulation material coating process K222 are almost the same as those of the rectangular tubular part connection process K121 and the insulation material coating process K122 described above [Figures 5(a)~(c)].

[0048] Hereinafter, as shown in Figure 5(a), the four sides of the vertical duct unit 20 that are continuous in the circumferential direction will be referred to as the top surface 22a, left side surface 22b, bottom surface 22c, and right side surface 22d. <Lateral attachment installation process K23> In the lateral attachment installation process K23, as shown in Figures 10(a) and (b), the lateral attachment 48 is attached to the lower surface 22c of the lateral duct unit 20.

[0049] First, one side of the horizontal attachment 48 is brought into contact with the lower surface 22c of the vertical duct unit 20, causing a specific portion 56L of the horizontal attachment 48 to protrude beyond the left side surface 22b of the vertical duct unit 20, and a specific portion 56R of the horizontal attachment 48 to protrude beyond the right side surface 22d of the vertical duct unit 20. The specific portion 56L is one end of the long frame 50L and the connecting frame 52, and the specific portion 56R is the opposite end of the long frame 50R and the connecting frame 52.

[0050] Furthermore, as shown in Figure 5(b), if an outward-facing flange portion 38a is provided at the end of the rectangular tubular part 38, the following two points should be noted when designing the lateral attachment 48. First, in order to prevent the flange portion 38a from interfering with the long frames 50L and 50R, the length of each connecting frame 52 should be set to a sufficient length, taking into account the protruding length of the flange portion 38a and the thickness of the insulation material 40. Also, in order to prevent the flange portion 38a from interfering with each connecting frame 52, as shown in Figure 10(a), the spacing L1 of the connecting frames 52 should be set to n times the length L1 of each rectangular tubular part 38 [n is a natural number / n=2 in Figure 10(a)].

[0051] When the horizontal attachment 48 is brought into contact with the vertical duct unit 20, the second fixing device 54 (movable frame 54a and second tightening fitting 54b) is prepared, the movable frame 54a is positioned above the upper surface 22a of the horizontal duct unit 22, and the two ends of the movable frame 54a are connected to specific parts 56L and 56R of the horizontal attachment 48 using two sets of second tightening fittings 54b, respectively, and tightened, thereby clamping the horizontal duct unit 22 between the horizontal attachment 48 and the movable frame 54a. Incidentally, in Figures 10(a) and (b), the "specific parts 56L and 56R" to which the second tightening fittings 54b are attached are shown as "both ends of the connecting frame 52," but they may also be "long frames 50R and 50L."

[0052] Furthermore, when the "specific parts 56L, 56R" are the "both ends of the connecting frame 52", it is preferable that the through holes provided in the connecting frame 52 and the movable frame 54a, that is, the through holes for inserting the bolt members of the second fastening fittings 54b, be elongated holes that are long in the longitudinal direction of each frame, rather than round holes. Generally, in air conditioning ducts, the pressure decreases on the downstream side where air flows, so the outer shape of the duct is set to be narrower towards the downstream side. Therefore, if the through holes for inserting the bolt members are elongated holes, the mounting positions of the two second fastening fittings 54b can be variably adjusted in the width direction, so that the lateral attachment 48 can be stably attached to the lateral duct unit 20.

[0053] When attaching the horizontal attachment 48 to the horizontal duct unit 22, using the second fastener 54 allows the horizontal attachment installation process K23 to be performed after all of the horizontal duct unit manufacturing processes K22 (corner tubular part connection process K221 and insulation material covering process K222) are completed, as shown in Figure 3(b), which has the advantage of simplifying the work procedure. Alternatively, as a method that does not use the second fastener 54, the connecting frame 52 can be directly screwed to the horizontal duct unit 22. If this method is chosen, it is preferable to directly fix the connecting frame 52 to the corner tubular part 38 and cover the connecting frame 52 with insulation material 40, so the horizontal duct unit manufacturing process K22 and the horizontal attachment installation process K23 should be performed in parallel and in combination, similar to processes K12 and K13 in Figure 3(a).

[0054] <Installation process K24 for horizontal duct units> The horizontal duct unit installation process K24 is performed after the horizontal duct unit manufacturing process K22 and the horizontal attachment installation process K24 have been completed. This process involves installing the horizontal duct unit 22, to which the horizontal attachment 48 has been attached, onto the ceiling-side beam steel frame 12t.

[0055] First, as shown in Figure 11(a), the horizontal duct unit 20 is lifted using a winch or a chain block equipped with a gear mechanism, with the horizontal attachment 48 positioned on the underside, and held in a specified position below the ceiling-side steel beams 12t-R and 12t-L. Subsequently, a worker riding in a crawler-type aerial work platform or the like uses two sets of suspension devices 58 to suspend and fix the lateral attachment 48 to the ceiling-side beam steel frame 12t-R, 12t-L. The suspension device 58 consists of a suspension bolt 58a, an upper support bracket 58b, and a lower support bracket 58c. The upper support bracket 58b is a fitting that has a threaded portion that screws into one end of the suspension bolt 58a and an upper fixing portion that can be fixed to the ceiling-side beam reinforcement 12t-R, 12t-L. The lower support bracket 58c is a fitting that has a threaded portion that screws into the other end of the suspension bolt 58a and a lower fixing portion that can be fixed to specific parts 56R, 56L of the lateral attachment 48.

[0056] Figure 11(b) shows the horizontal duct unit 22 installed on the ceiling-side steel beams 12t-R and 12t-L. The upper support bracket 58b is fixed to the flange of the ceiling-side steel beams 12t-R and 12t-L with its threaded portion screwed into one end of the suspension bolt 58a, and the lower support bracket 58c is fixed to specific parts 56R and 56L of the horizontal attachment 48 with its threaded portion screwed into the other end of the suspension bolt 58a, and the horizontal duct unit 22 is suspended and fixed to the ceiling-side steel beams 12t-R and 12t-L via the two suspension bolts 58a. Incidentally, in Figure 11(b), the "specific parts 56L and 56R" to which the lower support bracket 58c is attached are shown as "long frames 50R and 50L", but they may also be "both ends of the connecting frame 52".

[0057] The work of attaching the suspension device 58 by the worker at height is performed while the horizontal duct unit 22 is securely held by a chain block or the like, so there is no need to worry about the horizontal duct unit 22 falling off or being unexpectedly displaced. In addition, the work of attaching the suspension device 58 is not a very complicated task and can be completed easily in a short time. Therefore, it is less burdensome for the worker at height and allows them to work safely.

[0058] <Horizontal duct unit connection process K25> In the horizontal duct unit connection process K25, the horizontal duct unit 22 installed in the horizontal duct unit installation process K24 is connected to other components that make up the duct system 10. These other components include, for example, other horizontal duct units 22 or vertical duct units 20.

[0059] The horizontal duct unit connection process K25 may be performed in combination with other processes. For example, when connecting one end of a horizontal duct unit 22 to the upper end of an already installed vertical duct unit 20 using a connecting cylindrical part 24, it is preferable to connect one end of the connecting cylindrical part 24 to the upper end of the vertical duct unit 20 during the installation of the vertical duct unit 20 (for example, before the vertical duct installation process K14 for the vertical duct unit 20), and then, after performing the horizontal duct unit installation process K25 for the horizontal duct unit 22, connect the other end of the connecting cylindrical part 24 to one end of the horizontal duct unit 22. This makes the series of installation operations even more efficient.

[0060] <Summary of installation method for horizontal duct section 18> As described above, the horizontal duct section 18 shown in Figure 2 can be installed safely and efficiently by performing the horizontal attachment preparation step K21, the horizontal duct unit manufacturing step K22, the horizontal attachment installation step K23, the horizontal duct installation step K24, and the horizontal duct unit connection step K25 described above.

[0061] <<Summary of this embodiment>> In this embodiment of the duct installation method, the vertical duct unit 20 is formed on the ground in advance, and a unique vertical attachment 26 is attached to it, making it very easy to lift the vertical duct unit 20 and install it on the wall-side beam steel frame 12k. Similarly, the horizontal duct unit 22 is formed on the ground in advance, and a horizontal attachment 48 is attached to the horizontal duct unit 22, making it very easy to install the horizontal duct unit 22 on the ceiling-side beam steel frame 12t. Therefore, the burden on workers at height can be greatly reduced, and safety can be ensured.

[0062] <<<Other embodiments and variations>>> It should be noted that the duct installation method and vertical attachment of the present invention are not limited to the above embodiments. While the configuration of the vertical attachment 26 described above is very user-friendly, the configuration of the vertical attachment can be appropriately modified within the range in which the intended effects of the present invention can be obtained. For example, the vertical attachment 26 is mainly constructed by assembling square pipes in order to reduce weight while ensuring a certain level of strength, but L-shaped angle materials or U-shaped channel materials may also be used to obtain similar effects. If the conditions are met, materials other than square pipes, L-shaped angle materials, and U-shaped channel materials may also be used. The same applies to the horizontal attachment.

[0063] The vertical attachment 26 has two hook portions 30(1) and 30(2) on one main body portion 28, but three or more hook portions may be provided on one main body portion to obtain the same effect. Furthermore, the duct device installation method of the present invention may also use a vertical attachment with one hook portion on one main body portion.

[0064] The first fastener of the vertical attachment (a component for fixing the hook portion to the wall-side beam steel frame) may be changed to a different structure from the first fastener 46 described above, provided that it is easy to handle. Similarly, the second fastener of the horizontal attachment (a component for attaching the horizontal attachment to the horizontal duct unit) may be changed to a different structure from the second fastener 54 described above, provided that it is easy to handle.

[0065] The suspension device used in the horizontal duct unit installation process may be changed to one with a different structure from the suspension device 58 described above, provided that it is easy to handle. For example, the suspension device 58 described above uses a lower support bracket 58c as a means of connecting the suspension bolt 58a to specific parts 56L and 56R of the horizontal attachment 48, but the lower end of the suspension bolt 58c may be fixed to the specific parts 56L and 56R in advance. Figures 1 and 2 merely illustrate an example of a duct system to which the installation method of the present invention can be applied. Because the installation method of the present invention is highly versatile, it can be applied to duct systems with various layouts. [Explanation of Symbols]

[0066] 10 Duct System 12k, 12k(1), 12k(2) Wall-side beam steel frame 12t, 12t-R, 12t-L Ceiling side beam steel frame 14 buildings 16 Vertical duct section 18 Horizontal duct section 20 Vertical duct unit 20a front 20b left side 20c back 20d right side 20e Upper end 20f lower end 22 Horizontal duct unit 22a Top side 22b Left side 22c Bottom 22d Right side 26 Vertical Attachment 28 Main body 30,30(1),30(2) Hook section 30L(1), 30L(2) Left hook section 30R(1), 30R(2) Right hook section 32(1), 32(2) Side parts 34(1), 34(2) First vertical part 36(1), 36(2) Second vertical part 38 rectangular cylindrical parts 40, 40a, 40b insulation 46 First fixture 46a Movable vertical parts 46b First tightening fitting 48 Side Attachment 50L / 50R Long Frame 52 Connecting Frames 54 Second fixture 54a Movable frame 54b Second fastening fitting 56L,56R Specific parts 58 Hanging device 58a Suspension bolt 58b Upper support bracket 58c Lower support bracket

Claims

1. In a ductwork installation method for installing ductwork inside a building, The ducting device is a part installed vertically within the building, and includes vertical duct sections installed on multiple wall-side beam steel frames arranged at vertical intervals on the inner surface of the side walls of the building. A vertical attachment preparation step involves preparing a vertical attachment having a main body and a hook portion extending from the end of the main body and protruding to the side of the main body; A vertical duct unit manufacturing process involves connecting multiple rectangular tubular parts in the longitudinal direction to create a vertical duct unit that will become part of the vertical duct section, A vertical attachment installation step is performed such that, when the four sides of the vertical duct unit that are sequentially continuous in the circumferential direction are designated as the front, left, back, and right sides, and the two ends in the longitudinal direction are designated as the upper end and lower end, the main body of the vertical attachment is fixed to the right side of the vertical duct unit so that the multiple right hooks, which are the multiple hooks, each protrude laterally beyond the back at positions separated in the longitudinal direction of the vertical duct unit, and the open ends of the right hooks are positioned toward the lower end, and the main body of the vertical attachment is fixed to the left side of the vertical duct unit so that the multiple left hooks, which are the multiple hooks, each protrude laterally beyond the back at positions corresponding to the multiple right hooks, and the open ends of the left hooks are positioned toward the lower end, A process performed after the vertical duct unit manufacturing process and the vertical attachment installation process, comprising: a vertical duct unit installation process in which the vertical duct unit is lifted with its upper end facing upward, the left hook portion and the right hook portion are hooked onto the wall-side beam steel frame to temporarily hold the vertical duct unit, and then the left hook portion and the right hook portion are fixed to the wall-side beam steel frame, respectively, using a first fixing device; A ducting device installation method characterized by comprising a vertical duct unit connection step, which involves connecting the vertical duct unit installed in the vertical duct unit installation step to other members constituting the ducting device.

2. The duct device installation method according to claim 1, wherein the vertical duct unit manufacturing step includes a rectangular tubular part connecting step in which the ends of the rectangular tubular parts in the longitudinal direction are connected to each other, and an insulating material covering step in which the outer surface of the rectangular tubular part and the connection portion with other rectangular tubular parts are covered with insulating material.

3. The duct device installation method according to claim 1 or 2, wherein the vertical attachment prepared in the vertical attachment preparation step has a plurality of hook portions extending from the end of one long main body portion.

4. The hook portion of the vertical attachment prepared in the vertical attachment preparation step consists of a horizontal part made of a square pipe whose base end is fixed to the main body, a first vertical part made of a square pipe whose one end is fixed to one side of the base end of the horizontal part and extends in a direction intersecting the horizontal part, and a second vertical part made of a square pipe whose one end is fixed to the surface of the tip of the horizontal part that intersects with the one side and faces the first vertical part. The first fastener used in the vertical duct unit installation process consists of a movable vertical part made of a square pipe of a length corresponding to the first vertical part, and a first fastening fitting having a bolt member and a nut member. In the vertical duct unit installation step, the vertical duct unit is temporarily held in place by the wall-side beam steel frame, the movable vertical part is positioned near the second vertical part, and the two ends of the movable vertical part and the two ends of the first vertical part are connected and tightened using two sets of the first fastening fittings, thereby clamping the wall-side beam steel frame between the first vertical part and the movable vertical part, according to claim 1 or 2.

5. In a ductwork installation method for installing ductwork inside a building, The ducting device is a part that is installed laterally within the building, and includes a horizontal duct section installed on a plurality of ceiling-side steel beams arranged at horizontal intervals on the inner surface of the building's ceiling. A lateral attachment preparation step involves preparing a lateral attachment having a pair of long frames and a plurality of connecting frames that connect the pair of long frames in a ladder-like manner, A process for manufacturing a horizontal duct unit, which involves connecting multiple rectangular tubular parts in the longitudinal direction to create a horizontal duct unit that becomes part of the horizontal duct section, When the four sides of the horizontal duct unit that are sequentially continuous in the circumferential direction are designated as the top surface, left side surface, bottom surface, and right side surface, the horizontal attachment is fixed to the horizontal duct unit using a second fixing device, so that the multiple connecting frames abut against the bottom surface of the horizontal duct unit, and specific parts of the horizontal attachment, including a pair of left and right elongated frames, protrude beyond the left side surface or the right side surface of the horizontal duct unit, respectively, in the horizontal attachment mounting step. A step performed after the horizontal duct unit manufacturing step and the horizontal attachment installation step, comprising: a horizontal duct unit installation step in which the horizontal duct unit is lifted with the horizontal attachment positioned below it, and the left and right specific parts of the horizontal attachment are suspended and fixed to the ceiling beam steel frame using a suspension device; A ducting device installation method characterized by comprising a horizontal duct unit connection step, which involves connecting the horizontal duct unit installed in the horizontal duct unit installation step to other members constituting the ducting device.

6. The duct device installation method according to claim 5, wherein the horizontal duct unit manufacturing step includes a rectangular tubular part connecting step in which the ends of the rectangular tubular parts in the longitudinal direction are connected to each other, and an insulating material covering step in which the outer surface of the rectangular tubular part and the connection portion with other rectangular tubular parts are covered with insulating material.

7. The second fastener used in the lateral attachment mounting process consists of a movable frame having a length corresponding to the connecting frame, and a second fastening fitting having a bolt member and a nut member. The duct device installation method according to claim 5 or 6, wherein in the lateral attachment installation step, the lower surface of the lateral duct unit is brought into contact with one side of the lateral attachment, the movable frame is positioned above the upper surface of the lateral duct unit, and the two ends of the movable frame and the left and right specific parts of the lateral attachment are connected and tightened using two sets of second fastening fittings, thereby clamping the lateral duct unit between the lateral attachment and the movable frame.

8. The duct device installation method according to claim 5 or 6, wherein the suspension device used in the horizontal duct unit installation process comprises a suspension bolt, an upper support fitting having a threaded portion that screws into one end of the suspension bolt and an upper fixing portion that can be fixed to the ceiling-side beam reinforcement, and a lower support fitting having a threaded portion that screws into the other end of the suspension bolt and a lower fixing portion that can be fixed to the specific part of the horizontal attachment.

9. A vertical attachment used when installing a vertical duct unit, which consists of multiple rectangular tubular parts connected lengthwise, to multiple wall-side steel beams that are mounted vertically and spaced apart on the inner surface of the side wall of a building, It comprises a long main body and a plurality of hook portions extending from the end of the main body and protruding to the side of the main body, The main body is formed in such a shape that it can be attached to both the left and right sides of the vertical duct unit, when the four sides of the vertical duct unit are sequentially continuous in the circumferential direction and are designated as the front, left, back, and right sides, and the two ends in the longitudinal direction are designated as the upper and lower ends. The aforementioned hook portion is formed in a shape that can be hooked onto the wall-side beam steel frame, A vertical attachment characterized in that the plurality of hook portions are arranged at separate positions in the longitudinal direction of the vertical duct unit when the main body portion is attached to the right or left side of the vertical duct unit, each protruding laterally beyond the rear surface of the vertical duct unit, and each having an open end positioned toward the lower end of the vertical duct unit.

10. The hook portion is provided with a first fixing device for fixing it to the wall-side beam steel frame, The hook portion is composed of a horizontal part made of a square pipe whose base end is fixed to the main body, a first vertical part made of a square pipe whose one end is fixed to one side of the base end of the horizontal part and extends in a direction intersecting the horizontal part, and a second vertical part made of a square pipe whose one end is fixed to the surface of the tip of the horizontal part that intersects with the one side and faces the first vertical part. The first fixing device consists of a movable vertical part made of a square pipe of a length corresponding to the first vertical part, and a first fastening fitting having a bolt member and a nut member. The vertical attachment according to claim 9, wherein the hook portion is hooked onto the wall-side beam steel frame, the movable vertical part is positioned near the second vertical part, and the two ends of the movable vertical part and the two ends of the first vertical part are connected and tightened using two sets of the first fastening fittings, thereby allowing the wall-side beam steel frame to be clamped between the first vertical part and the movable vertical part.

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