Composite air pipe structure with lining fire-resistant heat-insulating layer and installation and construction method of composite air pipe structure

Abstract

The invention discloses a composite air pipe structure lined with a fire-resistant heat-insulating layer and an installation and construction method of the composite air pipe structure. The composite air pipe structure comprises a left-side anti-corrosion metal air pipe, a right-side anti-corrosion metal air pipe and a magnesium fire-proof plate, and one side of the left-side anti-corrosion metal air pipe is fixedly connected with a first angle steel flange through a bolt; a first through groove and a sixth through groove are symmetrically formed in the first angle steel flange; according to the invention, the left side anti-corrosion metal air pipe with the anti-oxidation coating is added by taking the galvanized plate as a base material, so that the anti-corrosion capability and the weather resistance are improved, and the service life is prolonged; all the used materials are A1-grade non-combustible, so that the fire resistance is higher, and the potential safety hazard is eliminated; the rock wool and the fireproof plate cover the outside of the left anti-corrosion metal air pipe, the dead weight is reduced by 50%, the building load is effectively reduced, the building cost is saved, the left anti-corrosion metal air pipe is provided with the fire-resistant heat insulation layer, secondary fireproof wrapping is not needed, construction is easy and convenient, the construction period is shortened by more than two times, the construction quality is effectively improved, the building space is saved, and the building layer height utilization rate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of air duct installation, and in particular to a composite air duct structure lined with a fire-resistant heat-insulating layer and an installation construction method thereof. Background Art

[0002] Duct systems play an important role in ventilation, air conditioning and air handling applications, regulating air quality, temperature control and energy efficiency within buildings; ducts can accurately deliver processed air to different areas inside the building to ensure that each room receives appropriate ventilation and temperature regulation; by connecting to air purification devices, ducts can remove dust, pollen and other pollutants from the air, thereby improving the health and comfort of occupants or users; duct systems can be customized according to the specific layout of the building to adapt to spaces of various shapes and sizes; but the popular ducts on the market currently have obvious defects: first, most ducts have poor corrosion resistance, resulting in a low service life of the ducts, which requires regular replacement and increases maintenance costs; second, the ducts are not fire-resistant enough and pose a safety hazard; finally, most duct buildings are heavy, take a long time to install and do not occupy building space; therefore, it is necessary to design a composite duct structure lined with a fire-resistant insulation layer and its installation and construction method. Summary of the invention

[0003] The object of the present invention is to provide a composite air duct structure lined with a fire-resistant insulation layer and an installation and construction method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a composite air duct structure lined with a fire-resistant and heat-insulating layer, comprising a left-side anti-corrosion metal air duct, a right-side anti-corrosion metal air duct and a magnesium fireproof board, one side of the left-side anti-corrosion metal air duct is fixedly connected with a first angle steel flange by bolts, a first through groove and a sixth through groove are symmetrically provided on the first angle steel flange, and a magnesium fireproof board is sleeved inside the left-side anti-corrosion metal air duct and the right-side anti-corrosion metal air duct.

[0005] As a further technical solution of the present invention, one side of the left anti-corrosion metal air duct is tightly attached to one side of the right anti-corrosion metal air duct, and one side of the right anti-corrosion metal air duct is fixedly connected with a second angle steel flange by bolts, and a second through groove and a fifth through groove are symmetrically opened on the second angle steel flange.

[0006] As a further technical solution of the present invention, the second angle steel flange and the first angle steel flange are fixed to each other by arranging bolts in the sixth through slot and the fifth through slot.

[0007] As a further technical solution of the present invention, the other side of the left anti-corrosion metal air duct is fixedly connected with a third angle steel flange by bolts, and the third angle steel flange is symmetrically provided with a third through groove and a fourth through groove.

[0008] As a further technical solution of the present invention, the other side of the right-side anti-corrosion metal air duct is fixedly connected with a fourth angle steel flange by bolts, and a seventh through groove and an eighth through groove are symmetrically opened on the fourth angle steel flange.

[0009] As a further technical solution of the present invention, a first galvanized iron sheet is provided at the bottom of the left anti-corrosion metal air duct, and the first galvanized iron sheet is fixedly connected to the first support bracket.

[0010] As a further technical solution of the present invention, a first suspension rod is connected to the threaded groove symmetrically provided on the first suspension bracket through threaded cooperation, a first gasket is sleeved on the first suspension rod, and a first fishtail anchor is fixedly connected to the first suspension rod.

[0011] As a further technical solution of the present invention, a second galvanized iron sheet is provided at the bottom of the right anti-corrosion metal air duct, and the second galvanized iron sheet is fixedly connected to the second support bracket.

[0012] As a further technical solution of the present invention, a second hanger is connected to the threaded groove symmetrically opened in the second hanger through threaded cooperation, a second gasket is sleeved on the second hanger, and a second fishtail anchor is fixedly connected to the second hanger.

[0013] A method for installing and constructing a composite air duct lined with a fire-resistant heat-insulating layer, comprising the following steps: step one, preparing the air duct; step two, making and installing a hanger; step three, connecting and installing the air duct; step four, sealing and light leakage detection; In the above step 1, the double-sided embossed steel plate lined with fire-resistant and heat-insulating layer composite duct installation construction technology is adopted to prepare the left anti-corrosion metal duct with galvanized plate as the base material and anti-oxidation coating, which improves the anti-corrosion ability, weather resistance and service life; the materials used are all A1 grade non-combustible, with higher fire resistance, eliminating safety hazards; the left anti-corrosion metal duct is covered with rock wool and fireproof board, and its self-weight is reduced by 50%, which effectively reduces the load of the building and saves construction costs. The left anti-corrosion metal duct has its own fire-resistant and heat-insulating layer and does not require secondary fireproof wrapping. Its construction is simple, shortening the construction period by more than 2 times, effectively improving the construction quality, saving building space, and improving the utilization rate of building floor height; according to the design drawings, the secondary deepening drawings drawn by designers and technicians and referring to the civil engineering baseline, the elevation of the left anti-corrosion metal duct is found, and the project technicians carry out in-depth design of various installation disciplines, especially the various professional pipelines in the same part are deepened into the same construction drawing, and the reasonable use of building information technology is convenient for the coordination of installation and construction, so that the construction works can better reflect the designer's intentions; In the above step 2, the screw holes on the first hanger should be machined, and gas cutting should not be used to open holes. The first hanger should be straight, and the thread should be complete and smooth. The embedded parts, nails or expansion bolts of the air duct and component hangers should be correctly positioned, firm and reliable. The embedded parts should be degreased and not painted. When embedding the bracket on the brick wall or concrete, the inside and outside of the hole should be consistent, the cement mortar should be compacted, the surface should be flat, and the embedding should be firm. When fixing the hanger with expansion bolts, the provisions of the technical conditions for the use of expansion bolts should be met. The first fishtail anchor should be degreased when embedded in the masonry or concrete to ensure a firm combination. When installing the first fishtail anchor, the hanger laying position should be found according to the center line of the air duct. The hanger should be fixed and adjusted in time during the installation of the air duct. Its position should be correct and the force should be uniform. The vertical installation spacing of the air duct should not be greater than 4m, but there should be no less than 2 fixings for each vertical pipe. In the above step 3, where the air duct line is long and the air ducts are neatly arranged, when installing the supports and hangers, first install the supports and hangers at both ends, and then use the supports and hangers at both ends as a reference to use the wire pulling method to find the elevation of the middle bracket for installation, and set anti-sway brackets at appropriate positions. Before installing the air duct system, it is necessary to further verify whether the elevation of the air duct and the return air outlet and other components are consistent with the design drawings, and check whether the holes reserved for civil engineering and the position and size of the embedded parts meet the requirements. The air ducts are arranged according to the numbers. After the sizes and angles of each part of the air duct system are confirmed to be correct, start to assemble. The horizontal air duct should be connected on the ground as much as possible, and can generally be connected to a unit of about 10 to 12 meters in length for lifting. In order to improve the lifting efficiency of the color steel plate composite air duct, it is recommended to use the air duct hydraulic installation The duct can be hoisted on the platform. It can also be hoisted section by section according to the actual situation of the construction site, and connected in sections or sections. For the assembled horizontal duct, use a hydraulic lift to lift a hoisting unit to about 100mm higher than the installation elevation, pull the horizontal line to tighten the hanger cross arm, let the duct drop to the cross arm, and adjust the installation height. Once the duct is hoisted, the support and hanger should be leveled immediately to prevent the duct from being deformed and cracked by torsion. When connecting the duct, it is not allowed to install the detachable interface in the wall or floor. In order to ensure the sealing of the joint at the interface, the interface of the pipe should be cut and trimmed around and placed neatly. When hoisting, if the construction gap is too small and it is difficult to ensure the sealing effect, you can apply adhesive on the overlap interface and then seal it; Among them, in the above step 4, the air leakage test of the system air duct and equipment is divided into positive pressure test and negative pressure test. The air leakage test of the system air duct can be carried out as a whole or in sections. During the test, all openings of the tested system should be closed and there should be no air leakage. When the air leakage of the tested system air duct exceeds the requirements of the design and this specification, the air leakage part should be found and marked. After the repair is completed, it should be retested until it is qualified. The light leakage method is used to detect the system. For every 10 meters of joints in the low-pressure system air duct, there shall be no more than 2 light leakage points, and the average number of light leakage points for 100 meters of joints shall not exceed 16. For every 10 meters of joints in the medium-pressure air duct, there shall be no more than 1 light leakage point, and 1 100 meters of joints are qualified if there are no more than 8 joints on average. A 100W low-voltage lighting lamp with a protective cover is used as the light source for light leakage detection. During daytime detection, the light source is placed on the outside of the air duct; during night detection, the light source is placed on the inside of the air duct. The detection light source is slowly moved along the detected part and the joint, and observation is made on the other side. When light is found to be emitted, it means that an obvious air leakage has been found, and records should be kept. The system air duct adopts the method of segmented detection and summary analysis. If strip-shaped light leakage is found during the light leakage detection, it is necessary to deal with different leakage parts separately. If the bite seam leakage is serious, the section of air duct should be remade and installed, and the light leakage test should be repeated.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the composite air duct structure with a fire-resistant and heat-insulating layer lining and the installation and construction method thereof, by using a galvanized sheet as the base material and adding an anti-oxidation coating to the left-side anti-corrosion metal air duct, improves the anti-corrosion ability, weather resistance and service life; the materials used are all A1 grade non-combustible, have higher fire resistance, and eliminate safety hazards; the left-side anti-corrosion metal air duct is covered with rock wool and fireproof board, and its own weight is reduced by 50%, which effectively reduces the load on the building and saves construction costs. The left-side anti-corrosion metal air duct has its own fire-resistant and heat-insulating layer and does not require secondary fireproof wrapping. Its construction is simple, shortens the construction period by more than 2 times, effectively improves the construction quality, saves building space, and improves the utilization rate of building floor height. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the present invention; Figure 2 It is an overall side view of the present invention; Figure 3 It is an overall top view of the present invention; Figure 4 is a process flow chart of the present invention; Figure 5 The figure is a flow chart of the method of the present invention.

[0016] In the figure: 1. left anti-corrosion metal air duct; 2. right anti-corrosion metal air duct; 3. first angle steel flange; 4. second angle steel flange; 5. first through slot; 6. second through slot; 7. first galvanized iron sheet; 8. first hanger; 9. first suspension rod; 10. first gasket; 11. first fishtail anchor; 12. third angle steel flange; 13. third through slot; 14. fourth through slot; 15. fifth through slot; 16. sixth through slot; 17. seventh through slot; 18. magnesium fireproof board; 19. fourth angle steel flange; 20. second galvanized iron sheet; 21. second hanger; 22. second suspension rod; 23. second gasket; 24. second fishtail anchor; 25. eighth through slot. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Please see attached Figure 1 -Attached Figure 3An embodiment of the present invention is as follows: a composite air duct structure lined with a fire-resistant and heat-insulating layer, comprising a left-side anti-corrosion metal air duct 1, a right-side anti-corrosion metal air duct 2 and a magnesium fireproof board 18, one side of the left-side anti-corrosion metal air duct 1 is fixedly connected with a first angle steel flange 3 by bolts, the first angle steel flange 3 is symmetrically provided with a first through groove 5 and a sixth through groove 16, the left-side anti-corrosion metal air duct 1 and the right-side anti-corrosion metal air duct 2 are internally sleeved with a magnesium fireproof board 18; one side of the left-side anti-corrosion metal air duct 1 is tightly attached to one side of the right-side anti-corrosion metal air duct 2, and the right-side anti-corrosion metal air duct 2 is fixedly connected to a second angle steel flange 4 by bolts, and a second through slot 6 and a fifth through slot 15 are symmetrically provided on the second angle steel flange 4; the second angle steel flange 4 and the first angle steel flange 3 are fixed to each other by bolts arranged in the sixth through slot 16 and the fifth through slot 15; the other side of the left anti-corrosion metal air duct 1 is fixedly connected to a third angle steel flange 12 by bolts, and a third through slot 13 and a fourth through slot 14 are symmetrically provided on the third angle steel flange 12, the third through slot 13 is used to fix the third angle steel flange 12 on the left anti-corrosion metal air duct 1, and the fourth through slot 14 is used to fix the third angle steel flange 12 on the left anti-corrosion metal air duct 1 The groove 14 is used to connect the next section of the air duct; the other side of the right anti-corrosion metal air duct 2 is fixedly connected to the fourth angle steel flange 19 by bolts, and the fourth angle steel flange 19 is symmetrically provided with a seventh through groove 17 and an eighth through groove 25; the bottom of the left anti-corrosion metal air duct 1 is provided with a first galvanized iron sheet 7, and the first galvanized iron sheet 7 is fixedly connected to the first hanger 8, and the first galvanized iron sheet 7 is used for heat insulation of the left anti-corrosion metal air duct 1; the first hanger 8 is symmetrically provided with a first hanger rod 9 through threaded matching in the threaded groove, and the first hanger rod 9 is sleeved with a first gasket 10. A first fishtail anchor 11 is fixedly connected to the first hanger 9; a second galvanized iron sheet 20 is arranged at the bottom of the right anti-corrosion metal air duct 2, and the second galvanized iron sheet 20 is fixedly connected to the second hanger 21; a second hanger 22 is connected to the threaded groove symmetrically opened in the second hanger 21 through threaded cooperation, a second gasket 23 is sleeved on the second hanger 22, and a second fishtail anchor 24 is fixedly connected to the second hanger 22, the second fishtail anchor 24 is buried in the building to fix the second hanger 21, and also serves as a support for the right anti-corrosion metal air duct 2.

[0019] Please see attached Figure 4 -Attached Figure 5 The present invention provides an embodiment: a method for installing and constructing a composite air duct lined with a fire-resistant heat-insulating layer, comprising the following steps: step one, preparing the air duct; step two, making and installing the hanger; step three, connecting and installing the air duct; step four, sealing and light leakage detection; Among them, in the above step 1, the double-sided embossed steel plate lined with fire-resistant and heat-insulating layer composite duct installation construction technology is adopted to prepare the left anti-corrosion metal duct 1 with galvanized plate as the base material and anti-oxidation coating, which improves the anti-corrosion ability, weather resistance and service life; the materials used are all A1 grade non-combustible, have higher fire resistance, and eliminate safety hazards; the left anti-corrosion metal duct 1 is covered with rock wool and fireproof board, and its self-weight is reduced by 50%, which effectively reduces the load of the building and saves construction costs. The left anti-corrosion metal duct 1 has its own fire-resistant and heat-insulating layer and does not require secondary fireproof wrapping. Its construction is simple, shortens the construction period by more than 2 times, effectively improves the construction quality, saves building space, and improves the utilization rate of building floor height; according to the design drawings, the secondary deepening drawings drawn by designers and technicians and referring to the civil engineering baseline, the elevation of the left anti-corrosion metal duct 1 is found, and the project technicians carry out in-depth design of various installation disciplines, especially the various professional pipelines in the same part are deepened into the same construction drawing, and the reasonable use of building information technology is convenient for the coordination of installation and construction, so that the construction works can better reflect the designer's intention; Among them, in the above step 2, the screw hole on the first support hanger 8 should be machined, and the hole should not be opened by gas cutting. The first hanger 9 should be straight, and the thread should be complete and smooth. The embedded parts, nails or expansion bolts of the air duct and component support hanger should be correctly positioned, firm and reliable. The embedded part should be degreased and should not be painted. When the bracket is embedded in the brick wall or concrete, the inside and outside of the hole should be consistent, the cement mortar should be compacted, the surface should be flat, and the embedding should be firm. When the support hanger is fixed with expansion bolts, it should comply with the provisions of the technical conditions for the use of expansion bolts. The first fishtail anchor 11 should be embedded in the masonry or concrete to remove oil and should not be sprayed with paint to ensure a firm combination. The installation of the first fishtail anchor 11 should find the hanger laying position according to the center line of the air duct. The support hanger should be fixed and adjusted in time during the installation of the air duct. Its position should be correct and the force should be uniform. The vertical installation spacing of the air duct should not be greater than 4m, but there should be no less than 2 fixings for each vertical pipe. In the above step 3, where the air duct line is long and the air ducts are neatly arranged, when installing the supports and hangers, first install the supports and hangers at both ends, and then use the supports and hangers at both ends as a reference to use the wire drawing method to find the elevation of the middle bracket for installation, and set anti-sway brackets at appropriate positions. Before installing the air duct system, it is necessary to further verify whether the elevation of the air duct and return exhaust vents and other components are consistent with the design drawings, and check the holes reserved for civil engineering and whether the position and size of the embedded parts meet the requirements. The air ducts are arranged according to the numbers. After the sizes and angles of each part of the air duct system are confirmed to be correct, start to assemble. The horizontal air duct should be connected on the ground as much as possible, and can generally be connected to a unit of about 10 to 12 meters in length for lifting. In order to improve the lifting efficiency of the color steel plate composite air duct, it is recommended to use air duct hydraulic The installation platform is used to lift the duct. It can also be lifted section by section, or connected in sections or sections according to the actual situation of the construction site. For the assembled horizontal duct, use a hydraulic lift to lift a lifting unit to about 100mm higher than the installation elevation, pull the horizontal line to tighten the hanger cross arm, let the duct drop to the cross arm, and adjust the installation height. Once the duct is hoisted, the support and hanger should be leveled immediately to prevent the duct from being deformed and cracked by torsion. When connecting the duct, it is not allowed to install the detachable interface in the wall or floor. In order to ensure the sealing of the joint at the interface, the interface of the pipe should be cut and trimmed around and placed neatly. When hoisting, if the construction gap is too small and it is difficult to ensure the sealing effect, you can apply adhesive on the overlap interface and then seal it; Among them, in the above step 4, the air leakage test of the system air duct and equipment is divided into positive pressure test and negative pressure test. The air leakage test of the system air duct can be carried out as a whole or in sections. During the test, all openings of the tested system should be closed and there should be no air leakage. When the air leakage of the tested system air duct exceeds the requirements of the design and this specification, the air leakage part should be found and marked. After the repair is completed, it should be retested until it is qualified. The light leakage method is used to detect the system. For every 10 meters of joints in the low-pressure system air duct, there shall be no more than 2 light leakage points, and the average number of light leakage points for 100 meters of joints shall not exceed 16. For every 10 meters of joints in the medium-pressure air duct, there shall be no more than 1 light leakage point, and 1 100 meters of joints are qualified if there are no more than 8 joints on average. A 100W low-voltage lighting lamp with a protective cover is used as the light source for light leakage detection. During daytime detection, the light source is placed on the outside of the air duct; during night detection, the light source is placed on the inside of the air duct. The detection light source is slowly moved along the detected part and the joint, and observation is made on the other side. When light is found to be emitted, it means that an obvious air leakage has been found, and records should be kept. The system air duct adopts the method of segmented detection and summary analysis. If strip-shaped light leakage is found during the light leakage detection, it is necessary to deal with different leakage parts separately. If the bite seam leakage is serious, the section of air duct should be remade and installed, and the light leakage test should be repeated.

[0020] Based on the above, the advantage of the present invention is that when the present invention is in use, the left-side anti-corrosion metal air duct 1 with an anti-oxidation coating added to the galvanized sheet as the base material improves the anti-corrosion ability, weather resistance and service life; the materials used are all A1 grade non-combustible, have higher fire resistance, and eliminate safety hazards; the left-side anti-corrosion metal air duct 1 is covered with rock wool and fireproof board, and its own weight is reduced by 50%, which effectively reduces the load on the building and saves construction costs. The left-side anti-corrosion metal air duct 1 has its own fire-resistant insulation layer and does not require secondary fireproof wrapping. Its construction is simple, shortens the construction period by more than 2 times, effectively improves the construction quality, saves building space, and improves the utilization rate of building floor height.

[0021] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A composite air duct structure lined with a fire-resistant heat-insulating layer, comprising a left-side anti-corrosion metal air duct (1), a right-side anti-corrosion metal air duct (2) and a magnesium fireproof board (18), characterized in that: One side of the left anti-corrosion metal air duct (1) is fixedly connected to a first angle steel flange (3) by means of bolts, and the first angle steel flange (3) is symmetrically provided with a first through groove (5) and a sixth through groove (16), and the left anti-corrosion metal air duct (1) and the right anti-corrosion metal air duct (2) are internally sleeved with a magnesium fireproof plate (18).

2. A composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 1, characterized in that: One side of the left anti-corrosion metal air duct (1) is closely attached to one side of the right anti-corrosion metal air duct (2); one side of the right anti-corrosion metal air duct (2) is fixedly connected to a second angle steel flange (4) by bolts; and the second angle steel flange (4) is symmetrically provided with a second through slot (6) and a fifth through slot (15).

3. The composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 1, characterized in that: The second angle steel flange (4) and the first angle steel flange (3) are fixed to each other by arranging bolts in the sixth through groove (16) and the fifth through groove (15).

4. A composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 2, characterized in that: The other side of the left anti-corrosion metal air duct (1) is fixedly connected to a third angle steel flange (12) by means of bolts, and a third through slot (13) and a fourth through slot (14) are symmetrically formed on the third angle steel flange (12).

5. The composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 2, characterized in that: The other side of the right anti-corrosion metal air duct (2) is fixedly connected to a fourth angle steel flange (19) by means of bolts, and a seventh through slot (17) and an eighth through slot (25) are symmetrically formed on the fourth angle steel flange (19).

6. A composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 4, characterized in that: A first galvanized iron sheet (7) is provided at the bottom of the left anti-corrosion metal air duct (1), and the first galvanized iron sheet (7) is fixedly connected to the first support bracket (8).

7. A composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 6, characterized in that: A first suspension rod (9) is connected to the threaded groove symmetrically formed in the first suspension bracket (8) through threaded engagement, a first gasket (10) is sleeved on the first suspension rod (9), and a first fishtail anchor (11) is fixedly connected to the first suspension rod (9).

8. The composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 5, characterized in that: A second galvanized iron sheet (20) is provided at the bottom of the right anti-corrosion metal air duct (2), and the second galvanized iron sheet (20) is fixedly connected to the second support bracket (21).

9. A composite air duct structure lined with a fire-resistant heat-insulating layer according to claim 8, characterized in that: A second suspension rod (22) is connected to the threaded groove symmetrically formed in the second suspension bracket (21) through threaded engagement, a second gasket (23) is sleeved on the second suspension rod (22), and a second fishtail anchor (24) is fixedly connected to the second suspension rod (22).

10. A method for installing and constructing a composite air duct lined with a fire-resistant insulation layer, comprising the following steps: Step 1: air duct preparation; Step 2: hanger production and installation; Step 3: air duct connection and installation; Step 4: sealing and light leakage detection; It is characterized by: In the above step 1, a double-sided embossed steel plate with a fire-resistant and heat-insulating layer composite duct installation construction technology is used to prepare a left-side anti-corrosion metal duct (1) with a galvanized plate as the base material and an anti-oxidation coating, thereby improving the anti-corrosion ability, weather resistance and service life. The materials used are all A1-level non-combustible, have higher fire resistance, and eliminate safety hazards. The left-side anti-corrosion metal duct (1) is covered with rock wool and fireproof board, and its self-weight is reduced by 50%, effectively reducing the load of the building and saving construction costs. The left-side anti-corrosion metal duct (1) has its own fire-resistant and heat-insulating layer and does not require secondary fireproof wrapping. Its construction is simple, shortening the construction period by more than 2 times, effectively improving the construction quality, saving building space, and improving the utilization rate of building floor height. According to the design drawings, the secondary detailed drawings drawn by the designers and technicians, and referring to the civil engineering baseline, the elevation of the left-side anti-corrosion metal duct (1) is found. The project technicians carry out in-depth design of various professional installations, especially deepening various professional pipelines in the same part into the same construction drawing, and reasonably using building information technology to facilitate the coordination of installation and construction, so that the construction works can better reflect the designer's intentions. In the above step 2, the screw hole on the first support hanger (8) should be machined and should not be cut by gas cutting. The first hanger (9) should be straight and the thread should be complete and smooth. The embedded parts, nails or expansion bolts of the air duct and component support hanger should be correctly positioned, firm and reliable. The embedded part should be degreased and should not be painted. When the bracket is embedded in the brick wall or concrete, the inside and outside of the hole should be consistent. The cement mortar should be compacted and the surface should be flat. The embedding should be firm. When the support hanger is fixed with expansion bolts, the provisions of the technical conditions for the use of expansion bolts should be met. The first fishtail anchor (11) should be degreased when embedded in the masonry or concrete (no paint should be sprayed) to ensure a firm connection. When installing the first fishtail anchor (11), the position of the hanger should be found according to the center line of the air duct. When installing the air duct, the support hanger should be fixed and adjusted in time. Its position should be correct and the force should be uniform. The vertical installation spacing of the air duct should not be greater than 4m, but the number of fixings for each vertical pipe should not be less than 2. In the above step 3, where the air duct line is long and the air ducts are neatly arranged, when installing the supports and hangers, first install the supports and hangers at both ends, and then use the supports and hangers at both ends as a reference to use the wire pulling method to find the elevation of the middle bracket for installation, and set anti-sway brackets at appropriate positions. Before installing the air duct system, it is necessary to further verify whether the elevation of the air duct and return (exhaust) vents and other components are consistent with the design drawings, and check the holes reserved for civil engineering and whether the position and size of the embedded parts meet the requirements. The air ducts are arranged according to the numbers. After the sizes and angles of each part of the air duct system are confirmed to be correct, start to assemble. The horizontal air duct should be connected on the ground as much as possible, and can generally be connected to a unit of about 10 to 12 meters in length for lifting. In order to improve the lifting efficiency of the color steel plate composite air duct, it is recommended to use air duct liquid Press the installation platform to lift the duct. It can also be lifted section by section according to the actual situation of the construction site, or connected in sections or sections. For the assembled horizontal duct, use a hydraulic lift to lift a lifting unit to about 100mm higher than the installation elevation, pull the horizontal line to tighten the hanger cross arm, let the duct drop to the cross arm, and adjust the installation height. Once the duct is hoisted, the support and hanger should be leveled immediately to prevent the duct from being deformed and cracked by torsion. When connecting the duct, it is not allowed to install the detachable interface in the wall or floor. In order to ensure the sealing of the joint at the interface, the interface of the pipe should be cut and trimmed around and placed neatly. When hoisting, if the construction gap is too small and it is difficult to ensure the sealing effect, you can apply adhesive on the overlap interface and then seal it; Among them, in the above step 4, the air leakage test of the system air duct and equipment is divided into positive pressure test and negative pressure test. The air leakage test of the system air duct can be carried out as a whole or in sections. During the test, all openings of the tested system should be closed and there should be no air leakage. When the air leakage of the tested system air duct exceeds the requirements of the design and this specification, the air leakage part should be found and marked. After the repair is completed, it should be retested until it is qualified. The light leakage method is used to detect the system. For every 10 meters of joints in the low-pressure system air duct, there shall be no more than 2 light leakage points, and the average number of light leakage points for 100 meters of joints shall not exceed 16. For every 10 meters of joints in the medium-pressure air duct, there shall be no more than 1 light leakage point, and 1 100 meters of joints are qualified if there are no more than 8 joints on average. A 100W low-voltage lighting lamp with a protective cover is used as the light source for light leakage detection. During daytime detection, the light source is placed on the outside of the air duct; during night detection, the light source is placed on the inside of the air duct. The detection light source is slowly moved along the detected part and the joint, and observation is made on the other side. When light is found to be emitted, it means that an obvious air leakage has been found, and records should be kept. The system air duct adopts the method of segmented detection and summary analysis. If strip-shaped light leakage is found during the light leakage detection, it is necessary to deal with different leakage parts separately. If the bite seam leakage is serious, the section of air duct should be remade and installed, and the light leakage test should be repeated.

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