Sleeve, smoke vent structure, method for installing smoke vent structure, and method for removing smoke vent structure

Abstract

To provide a sleeve, a smoke exhaust port structure, an installation method of the smoke exhaust port structure, and a removal method of the smoke exhaust port structure, for safely and easily performing installation work and removal work of the smoke exhaust port structure, by arranging the sleeve for maintaining airtightness of a smoke exhaust port including a frame member and a smoke exhaust panel on the outside of the frame member.SOLUTION: In a sleeve 4 for maintaining airtightness of a smoke exhaust port 1 attached to a smoke exhaust duct 5, the smoke exhaust port 1 includes a frame member 2 and a smoke exhaust panel 3 openably / closably attached to the frame member 2. A smoke vent structure A including a sleeve 4 and a smoke vent 1 attached to a smoke vent duct 5, wherein the sleeve 4 is configured to be disposed outside a frame member 2, the smoke vent 1 includes the frame member 2 and a smoke vent panel 3 attached to the frame member 2 so as to be openable and closable, and the sleeve 4 is disposed outside the frame member 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sleeve, a smoke vent structure, a method for installing a smoke vent structure, and a method for removing a smoke vent structure. [Background technology]

[0002] Smoke exhaust ducts are installed in the ceilings, walls, etc. of buildings to exhaust smoke generated in the event of a fire. Smoke exhaust vents are known that are connected to this smoke exhaust duct, close the smoke exhaust duct route under normal conditions, and open by operating a smoke detector or manual opening device, or that have the function of opening by a signal from a control panel or the like to which disaster prevention equipment such as smoke detectors is connected. Such a smoke exhaust outlet has a frame member that attaches the smoke exhaust outlet to the smoke exhaust duct, and a smoke exhaust panel that is rotatably supported on the frame member, and the smoke exhaust outlet is opened by rotating the smoke exhaust panel. The frame member is fixed to a mounting member such as an angle bar provided on the smoke exhaust duct with fastening means such as bolts and nuts, thereby fixing the smoke exhaust port to the smoke exhaust duct (see Patent Document 1).

[0003] First, we will explain the smoke exhaust outlet 1 installed in a conventional smoke exhaust duct 5. As shown in Figures 6 and 7, mounting angles 6, which are components for installing the smoke exhaust outlet 1, are attached to two locations within the smoke exhaust duct 5, and a frame member 2 of the smoke exhaust outlet 1 is fixed so as to be suspended from each of the two mounting angles 6 by fully threaded bolts 7 and nuts 8 at two locations each. A smoke exhaust panel 3 is supported on the frame member 2 so that it can be opened and closed freely. Next, a method for installing a smoke exhaust outlet 1 in a conventional smoke exhaust duct 5 will be described. FIG. 8 is a diagram showing a conventional smoke exhaust duct 5 and smoke exhaust outlet 1 before the smoke exhaust outlet 1 is installed. From this state, mounting angles 6, which are components for installing the smoke exhaust outlet 1, are fixed with screws 61 at two locations within the smoke exhaust duct 5. Then, two fully threaded bolts 7 are fixed with nuts 8 to each of the two mounting angles 6. The frame member 2 of the smoke exhaust outlet 1 (with the smoke exhaust panel 3 in an open position) is fixed to these fully threaded bolts 7 with nuts 8 so as to suspend it. Finally, an airtight material (not shown), such as aluminum tape, is attached to the airtight treatment portion 9 extending from the rear end of the fixed frame member 2 to the smoke exhaust duct 5 to maintain airtightness. The airtight material attachment work (airtight treatment) is performed on the installed frame member 2 with the smoke exhaust panel 3 in an open position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 3-38863 Summary of the Invention [Problem to be solved by the invention]

[0005] When installing a conventional smoke exhaust vent 1, in order to make the smoke exhaust vent 1 and the smoke exhaust duct 5 airtight, it is necessary to insert a hand through a narrow opening S (see Figure 8(b)) between the open smoke exhaust panel 3 and the frame member 2 of the smoke exhaust vent 1 to perform the airtight treatment.In addition, the smoke exhaust panel 3 and the opening and closing device 212 of the smoke exhaust panel 3 make it impossible to see the airtight treatment section 9, making the airtight treatment difficult, and there have been cases where the installation of the smoke exhaust vent 1 has been completed without the airtight treatment being completely performed. Similarly, when removing the smoke exhaust vent 1, the work of removing the airtight material was difficult.

[0006] Therefore, the present invention aims to provide a sleeve, a smoke vent structure, an installation method for a smoke vent structure, and a removal method for a smoke vent structure, which allows the installation and removal of the smoke vent structure to be performed safely and easily by configuring a sleeve that maintains the airtightness of a smoke vent including a frame member and a smoke vent panel to be positioned on the outside of the frame member. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention has the following configuration. A sleeve for maintaining airtightness of a smoke exhaust port attached to a smoke exhaust duct, The smoke exhaust port includes a frame member and a smoke exhaust panel attached to the frame member in an openable and closable manner, The sleeve is configured to be disposed on the outside of the frame member. A sleeve characterized by: In order to solve the above problems, the present invention also has the following configuration. A smoke exhaust port structure having the sleeve and a smoke exhaust port attached to a smoke exhaust duct, The smoke exhaust port includes the frame member and a smoke exhaust panel attached to the frame member in an openable and closable manner, The sleeve is disposed outside the frame member. A smoke exhaust structure characterized by: In order to solve the above problems, the present invention also has the following configuration. A method for installing the smoke exhaust structure, a sleeve mounting step of mounting the sleeve to the smoke exhaust duct and providing an airtight material between the smoke exhaust duct and the sleeve; a smoke exhaust port mounting step of inserting the smoke exhaust port into the inside of the sleeve and mounting the smoke exhaust port to the smoke exhaust duct; A method for installing a smoke exhaust structure, comprising: In order to solve the above problems, the present invention also has the following configuration. A method for removing the smoke exhaust structure, comprising: a smoke exhaust port removing step of removing the smoke exhaust port from the smoke exhaust duct; a sleeve removing step of removing an airtight material between the smoke exhaust duct and the sleeve, and removing the sleeve from the smoke exhaust duct. [Effects of the Invention]

[0008] The present invention provides a sleeve, a smoke vent structure, a method for installing a smoke vent structure, and a method for removing a smoke vent structure, which allow the installation and removal of the smoke vent structure to be performed safely and easily by configuring a sleeve that maintains the airtightness of a smoke vent including a frame member and a smoke vent panel to be positioned on the outside of the frame member. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a partially transparent perspective view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention. [Figure 2] 1A is a cross-sectional view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention, and FIG. 1B is a view from the opening side. [Figure 3] 1 is a partially transparent perspective view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention before installation. [Figure 4] 1 is a partially transparent perspective view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention when installed. [Figure 5] 1A is a cross-sectional view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention when installed, and FIG. 1B is a view from the opening side. [Figure 6] FIG. 2 is a partially see-through perspective view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to a modified example of the embodiment of the present invention. [Figure 7] FIG. 1 is a partially transparent perspective view of a conventional smoke exhaust port 1 and a smoke exhaust duct 5. [Figure 8] 1A is a cross-sectional view of a conventional smoke exhaust port 1 and a conventional smoke exhaust duct 5, and FIG. 1B is a view from the opening side. [Figure 9]FIG. 1 is a partially transparent perspective view of a conventional smoke exhaust port 1 and a smoke exhaust duct 5 before installation. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment] Below, with reference to the drawings, we will explain the sleeve 4, smoke exhaust port structure A, method of installing the smoke exhaust port structure A in the smoke exhaust duct 5, and method of removing the smoke exhaust port structure A from the smoke exhaust duct 5 of an embodiment of the present invention. The opening side of the smoke exhaust port 1, sleeve 4 and smoke exhaust duct 5 is called the front, and the opposite side (the back side) is called the rear. In the following description, the same reference numerals in different drawings indicate parts with the same functions, and duplicated descriptions in each drawing will be omitted as appropriate.

[0011] [Overall structure] FIG. 1 is a perspective view of a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the present invention, and is a see-through view of the inside of the smoke exhaust duct 5. As shown in FIG. FIG. 2 shows a smoke exhaust port 1, a sleeve 4, and a smoke exhaust duct 5 according to an embodiment of the invention, with (a) a cross-sectional view and (b) a view from the opening side. In this embodiment, a smoke exhaust outlet 1 including a frame member 2 and a smoke exhaust panel 3, and a smoke exhaust outlet structure A having a sleeve 4 are installed at the open end of a smoke exhaust duct 5, and the smoke exhaust outlet structure A and the smoke exhaust duct 5 form a smoke exhaust structure. The smoke exhaust duct 5 in this embodiment is a branch duct connected to a main duct. A sleeve 4 is attached to the inside of the smoke exhaust duct 5, and a frame member 2 with a smoke exhaust panel 3 attached thereto is attached to the inside of the sleeve 4. This sleeve 4 maintains airtightness between the smoke exhaust port 1 and the smoke exhaust duct 5. The smoke exhaust panel 3 is a rectangular panel that is attached to the frame member 2 so as to be able to open and close freely. The frame member 2 is attached to a mounting angle 6 which is fixed to the inner peripheral surface of the smoke exhaust duct 5 with screws 61 . A Hayauma angle may be used as the mounting angle 6. When a Hayauma angle is used, a fully threaded bolt 7 is attached to a hole in the Hayauma angle that matches the position of a bolt insertion hole 221 in a frame member mounting flange 22, which will be described later. The mounting angle 6 can also be installed on the inner peripheral surface of the main duct so as to straddle the opening of the branch duct that opens into the main duct.

[0012] [Frame member] The frame member 2 has a frame member cylindrical portion 21 with a rectangular cross section, a frame member mounting flange 22 formed at the rear end of the frame member cylindrical portion 21, and a frame member opening flange 23 attached to the front end of the frame member cylindrical portion 21. The cylindrical frame member portion 21 is a cylindrical member with a rectangular cross section, and houses various devices that make up the smoke exhaust port 1. The sleeve 4 is designed to have dimensions slightly larger than the outer periphery of the cylindrical frame member portion 21 so that it can be installed outside the cylindrical frame member portion 21. In this embodiment, the front end of the frame member cylindrical portion 21 is formed with a frame member cylindrical portion flange 211 that is formed so as to protrude outward along the entire periphery. An opening / closing device 212 for opening and closing the smoke exhaust panel 3 is attached to the inner peripheral surface of the frame member cylindrical portion 21. In this embodiment, the opening / closing device 212 is a device that locks the panel stopper 32 of the smoke exhaust panel 3 when it is closed and releases the lock of the panel stopper 32 of the smoke exhaust panel 3 when the smoke exhaust panel 3 is opened. Furthermore, a device that has a motor and opens and closes the smoke exhaust panel 3 by winding up and rewinding a wire attached to the smoke exhaust panel 3 may also be used. Any known device may be used as this opening / closing device, and detailed description thereof will be omitted.

[0013] The frame member mounting flange 22 is formed at the rear end of the frame member tubular portion 21 by bending the frame member tubular portion 21 so as to protrude inward of the frame member tubular portion 21, and is fixed to a mounting angle 6 attached to the smoke exhaust duct 5 with fully threaded bolts 7 and nuts 8. In this embodiment, the frame member mounting flange 22 is formed on the four inner circumferential surfaces of the frame member tubular portion 21. Bolt insertion holes 221 for passing fully threaded bolts 7 through are formed in portions formed on two of the opposing inner circumferential surfaces. When the mounting angles 6 are attached only to the two opposing inner peripheral surfaces of the smoke exhaust duct 5 as in this embodiment, the frame member mounting flanges 22 can also be formed only on the two opposing inner peripheral surfaces, but it is also possible to form the frame member mounting flanges 22 on all four inner peripheral surfaces to increase the strength of the frame member 2. The frame member mounting flanges 22 may also be molded separately from the frame member cylindrical portion 21 and attached to the rear end of the frame member cylindrical portion 21. The mounting angle 6 can also be attached to all four inner peripheral surfaces of the smoke exhaust duct 5. In this case, the frame member mounting flange 22 having the bolt insertion holes 221 is also formed on all four inner peripheral surfaces of the frame member cylindrical portion 21. Furthermore, the fixing of the frame member mounting flange 22 and the mounting angle 6 is not limited to the combination of the fully threaded bolt 7 and nut 8, but may be selected appropriately from any known fastening means.

[0014] A frame member opening flange 23 is attached to the front side surface of the frame member cylindrical portion flange 211 of the frame member cylindrical portion 21. The frame member opening flanges 23 are formed to protrude outward and inward from the frame member cylindrical portion flanges 211 on the four peripheral surfaces of the frame member cylindrical portion 21, and protrusions that protrude rearward are formed at these outer and inner ends, forming a generally U-shaped cross section. The outer side of the frame member opening flanges 23 is designed to protrude significantly outward from the frame member cylindrical portion 21 in order to seal the gap between an opening in a ceiling surface, wall surface, etc. and the smoke exhaust duct 5, the gap between the opening of the smoke exhaust duct 5 and the sleeve 4, and the gap between the sleeve 4 and the frame member cylindrical portion 21. The front surface of the frame member cylindrical portion flange 211 abuts against the rear surface of the frame member opening flange 23. Therefore, the rear surface of the frame member opening flange 23 has a width that allows the frame member cylindrical portion flange 211 to abut against it. Note that the frame member cylindrical portion 21 may be composed of only the frame member cylindrical portion 21 without having the frame member cylindrical portion flange 211. In this case, the front end of the frame member cylindrical portion 21 abuts against the rear surface of the frame member opening flange 23. Further, the frame member opening flange 23 is formed with a smoke exhaust panel support portion 231 for supporting the smoke exhaust panel 3 so that it can rotate freely. The shape and structure of the frame member 2 are not limited to those of this embodiment, and any shape and structure may be used as long as the smoke exhaust panel 3 can be installed in the smoke exhaust duct 5.

[0015] [Smoke exhaust panel] The smoke exhaust panel 3 has two support shafts 31 and a panel stopper 32 supported by the frame member 2 . The two support shafts 31 are supported by the smoke exhaust panel support parts 231 of the frame member 2, and support the smoke exhaust panel 3 on the frame member 2 so that it can rotate freely. A torsion spring 33 is fitted in at least one of the two support shafts 31. One end of the torsion spring 33 is fixed to the smoke exhaust panel 3 side, and the other end is fixed to the frame member 2 side. The torsion spring 33 biases the smoke exhaust panel 3 in the opening direction, and when the smoke exhaust panel 3 is opened, the torsion spring 33 opens the smoke exhaust panel 3. Note that the means for biasing the smoke exhaust panel 3 in the opening direction is not limited to the torsion spring 33, and any other biasing means may be used. The shape and structure of the smoke exhaust panel 3 are not limited to those of this embodiment, and may be any type that can be supported on the smoke exhaust port 1 so as to be able to open and close freely and can block the opening of the smoke exhaust port 1.

[0016] [sleeve] The sleeve 4 has a sleeve tubular portion 41 having a rectangular cross section, and a sleeve opening flange 42 formed at the front end of the sleeve tubular portion 41 . The cylindrical sleeve portion 41 is a cylindrical member with a rectangular cross section, and houses the frame member 2, the smoke exhaust panel 3, etc. The cylindrical sleeve portion 41 is designed to have dimensions slightly smaller than the inner peripheral dimensions of the smoke exhaust duct 5 so that it can be installed inside the smoke exhaust duct 5. The sleeve opening flange 42 is formed on all four circumferential surfaces of the cylindrical sleeve portion 41 so as to protrude from the front end of the cylindrical sleeve portion 41 to the outside of the cylindrical sleeve portion 41 . The sleeve opening flange 42 is designed to protrude significantly outside the sleeve cylindrical portion 41 in order to close the gap between the smoke exhaust duct 5 and an opening in a ceiling or wall, and between the opening of the smoke exhaust duct 5 and the sleeve cylindrical portion 41. The front end of the smoke exhaust duct 5 abuts against the rear surface of the sleeve opening flange 42.

[0017] The area extending from the rear end of the sleeve 4 to the inner surface of the smoke exhaust duct 5 is an airtight treatment section 9 for maintaining airtightness between the sleeve 4 and the smoke exhaust duct 5, and aluminum tape (not shown) is attached around the entire circumference. Furthermore, an airtight material 43 is installed around the entire periphery of the front surface of the sleeve opening flange 42. The airtight material 43 abuts against the rear surface of the frame member cylindrical portion flange 211, airtightly connecting the front end of the frame member 2 and the front end of the sleeve 4. This airtight material 43 may be appropriately selected from known airtight materials such as rubber packing. The sleeve 4 may be configured only with the sleeve tubular portion 41 without having the sleeve opening flange 42. In this case, the front end of the sleeve tubular portion 41 abuts against the rear surface of the frame member opening flange 23, and an airtight material is placed between the front end of the sleeve tubular portion 41 and the rear surface of the frame member opening flange 23. This airtight material may be a rubber packing or something like a caulking agent.

[0018] [How to install a smoke exhaust vent] FIG. 3 is a perspective view of the smoke exhaust port 1 and the smoke exhaust duct 5 according to the embodiment of the present invention before installation, and is a see-through view of the inside of the smoke exhaust duct 5. As shown in FIG. FIG. 4 is a perspective view of the smoke exhaust port 1 and the smoke exhaust duct 5 according to the embodiment of the present invention after the sleeve 4 has been installed, and is a see-through view of the inside of the smoke exhaust duct 5. As shown in FIG. FIG. 5 shows (a) a cross-sectional view and (b) a view from the opening side of the smoke exhaust port 1 and the smoke exhaust duct 5 according to the embodiment of the present invention after the sleeve 4 has been installed. The method for installing the smoke exhaust port 1 in the smoke exhaust duct 5 provided on the ceiling or wall is as follows. (1) Mounting angle 6 installation process If the mounting angle 6 is not installed in the smoke exhaust duct 5, install the mounting angle 6. As in the conventional case, the mounting angle 6, which is a component for installing the smoke exhaust outlet 1, is fixed with screws 61 in two places in the smoke exhaust duct 5. (2) Sleeve 4 installation process The sleeve 4 is attached to the smoke exhaust duct 5 with the mounting angle 6 installed. The sleeve tubular portion 41 is inserted into the smoke exhaust duct 5, and the rear surface of the sleeve opening flange 42 is brought into contact with the front end of the smoke exhaust duct 5. In this state, aluminum tape sealing material is applied to the airtight treatment portion 9 that extends from the rear end of the sleeve tubular portion 41 to the inner surface of the smoke exhaust duct 5, fixing the sleeve 4 to the inner surface of the smoke exhaust duct 5 and sealing the gap between the sleeve 4 and the inner surface of the smoke exhaust duct 5. Note that other known airtight materials may be used as the airtight material instead of aluminum tape. (3) Frame member 2 installation process First, the fully threaded bolts 7 are fixed with nuts 8 at two locations on each mounting angle 6. Although three nuts 8 are used in this embodiment, the number of nuts 8 can be changed as needed. Next, the frame member tubular portion 21 of the frame member 2 with the smoke exhaust panel 3 in the open state is inserted into the sleeve 4. At this time, the fully threaded bolt 7 fixed to the mounting angle 6 is inserted into the bolt insertion hole 221 of the frame member mounting flange 22 at the rear end of the frame member tubular portion 21, and the rear surface of the frame member opening flange 23 is brought into strong contact with the airtight material 43 affixed to the front surface of the sleeve opening flange 42 of the sleeve 4. Finally, while supporting the frame member 2 inserted in the sleeve 4, the frame member 2 is fixed to the fully threaded bolt 7 using the nut 8 by inserting a hand or a tool.

[0019] In this way, when installing the smoke exhaust outlet 1 in the smoke exhaust duct 5, first only the sleeve 4 is installed in the smoke exhaust duct 5, and then the airtight treatment can be performed.Therefore, when performing the airtight treatment, it is possible to insert a hand through the large opening S of the sleeve 4 (see Figure 5(b)), and the airtight treatment unit 9 can also be easily seen. In this embodiment, the length of the sleeve 4 in the front-to-rear direction is shorter than the length of the frame member 2 in the front-to-rear direction, and when the smoke exhaust port 1 is installed in the smoke exhaust duct 5, the rear end of the sleeve 4 is located forward of the rear end of the frame member 2. With this configuration, the airtight treatment unit 9 is located forward of the rear end of the frame member 2 and close to the open end of the smoke exhaust port 1, making it easy to perform the airtight treatment work. After the sleeve 4 is attached, the frame member 2 with the smoke exhaust panel 3 attached to the installed sleeve 4 is fixed to the mounting angle 6 attached to the smoke exhaust duct 5 with the fully threaded bolts 7. At this time, the airtight material 43 attached to the front surface of the sleeve opening flange 42 of the sleeve 4 abuts against the rear surface of the frame member cylindrical portion flange 211 of the frame member 2, airtightly connecting the front end of the frame member 2 and the front end of the sleeve 4. Therefore, there is no need to perform airtight treatment work after attaching the frame member 2. This work procedure eliminates the need to insert hands or tools through the narrow opening S (see Figure 8(b)) between the frame member 2 and the smoke exhaust panel 3 to perform airtight treatment, as was done in the past, making the installation work safer and easier than conventional installation work.

[0020] The length of the sleeve 4 in the front-to-rear direction does not need to be shorter than the length of the frame member 2 in the front-to-rear direction, and may be the same as or longer than the length of the frame member 2 in the front-to-rear direction. However, the rear end of the sleeve 4 needs to be located forward of the mounting angle 6. FIG. 6 shows a modified example in which the length of the sleeve 4 in the front-rear direction is longer than the length of the frame member 2 in the front-rear direction, and the rear end of the sleeve 4 is located forward of the mounting angle 6. In this modified example, as in the embodiment, when performing the airtight treatment, it is possible to insert a hand through the large opening S of the sleeve 4 (see Figure 5(b)), and the airtight treatment section 9 can be easily seen. Since there is no need to perform the airtight treatment work after attaching the frame member 2, the installation work can be performed safely and easily compared to conventional installation work.

[0021] [How to remove smoke exhaust vent 1] The method for removing the smoke exhaust port 1 from the smoke exhaust duct 5 installed on the ceiling or wall is as follows. (1) Removal process of frame member 2 First, remove the frame member 2 from the smoke exhaust duct 5. Remove the frame member 2 by removing the nuts 8 from each of the four fully threaded bolts 7 that secure the frame member 2, and then, if necessary, remove the four fully threaded bolts 7 from the mounting angles 6 by removing the nuts 8 from each of them. Next, while supporting the frame member 2 inside the opening of the smoke exhaust duct 5, insert your hand or a tool to remove the nut 8 and remove the frame member 2 from the mounting angle 6. (2) Removal process of sleeve 4 The aluminum tape sealing material attached to the airtight treatment part 9 extending from the rear end of the sleeve cylindrical part 41 to the inner peripheral surface of the smoke exhaust duct 5 is peeled off and removed, and the sleeve 4 is removed from the smoke exhaust duct 5. (3) Removal process of mounting angle 6 If necessary, remove the mounting angle 6 from the smoke exhaust duct 5. The fully threaded bolts 7 may be removed during the process of removing the mounting angle 6, rather than during the process of removing the frame member 2.

[0022] In this way, when removing the smoke exhaust outlet 1 from the smoke exhaust duct 5, first the frame member 2 to which the smoke exhaust panel 3 is attached is removed from the mounting angle 6 attached to the smoke exhaust duct 5, and then the airtight treatment material can be removed with only the sleeve 4 installed inside the smoke exhaust duct 5.This makes it possible to insert a hand through the large opening S of the sleeve 4 and also makes it easy to see the airtight treatment part 9. As described above, in this embodiment, the airtight treatment part 9 is located forward of the rear end of the frame member 2 and close to the open end of the smoke exhaust port 1, making it easy to remove the airtight treatment material. This work procedure eliminates the need to insert hands or tools through the narrow opening S between the frame member 2 and the smoke exhaust panel 3 to remove the airtight material, as was done in the past, making the removal work safer and easier than conventional removal work.

[0023] The above has described in detail the sleeve 4, smoke exhaust structure A, method of installing the smoke exhaust structure A in the smoke exhaust duct 5, and method of removing the smoke exhaust structure A from the smoke exhaust duct 5 of the embodiment and its modified example of the present invention with reference to the drawings. However, the specific configuration is not limited to these embodiment and modified example, and the present invention also includes design changes within the scope of the present invention that do not deviate from the gist of the present invention. [Explanation of symbols]

[0024] A Smoke exhaust structure 1 Smoke exhaust vent 2 Frame members 21 Frame member cylindrical portion 211 Frame member cylindrical part flange 212 Switchgear 22 Frame member mounting flange 221 Bolt insertion hole 23 Frame member opening flange 231 Smoke exhaust panel support 3 Smoke exhaust panel 31 Support shaft 32 Panel stopper 33 Torsion spring 4 sleeves 41 sleeve cylindrical portion 42 Sleeve opening flange 43 Airtight material 5 Smoke exhaust duct 6 Mounting angle 61 Bis 7 Fully threaded bolts 8 nuts 9 Airtight treatment section S opening

Claims

1. A sleeve for maintaining airtightness of a smoke exhaust port attached to a smoke exhaust duct, The smoke exhaust port includes a frame member and a smoke exhaust panel attached to the frame member in an openable and closable manner, The sleeve is configured to be disposed on the outside of the frame member. A sleeve characterized by:

2. 2. The sleeve according to claim 1, wherein the length of the sleeve in the front-rear direction is shorter than the length of the frame member in the front-rear direction.

3. 2. The sleeve according to claim 1, wherein an airtight material is provided at the front end of the sleeve.

4. A flange portion is formed at the front end of the sleeve, 2. The sleeve according to claim 1, wherein an airtight material is provided on the front surface of the flange portion.

5. A smoke exhaust port structure having the sleeve according to any one of claims 1 to 4 and the smoke exhaust port attached to the smoke exhaust duct, The smoke exhaust port includes the frame member and the smoke exhaust panel attached to the frame member in an openable and closable manner, The sleeve is disposed outside the frame member. A smoke exhaust structure characterized by:

6. A method for installing the smoke exhaust structure according to claim 5, a sleeve mounting step of mounting the sleeve to the smoke exhaust duct and providing an airtight material between the smoke exhaust duct and the sleeve; a smoke exhaust port mounting step of inserting the smoke exhaust port into the inside of the sleeve and mounting the smoke exhaust port to the smoke exhaust duct; A method for installing a smoke exhaust structure, comprising:

7. A method for removing the smoke exhaust structure according to claim 5, comprising: a smoke exhaust port removing step of removing the smoke exhaust port from the smoke exhaust duct; a sleeve removing step of removing an airtight material between the smoke exhaust duct and the sleeve, and removing the sleeve from the smoke exhaust duct.

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