Angle steel flange connection 1. Angle steel flange connection is a traditional air duct connection method. The flange is generally made of angle iron (so it is also called angle iron flange). The angle iron is usually fixed at both ends of the air duct by riveting. After the flanges of the air ducts are butted together, a gasket is added in the middle to connect them with bolts. The advantages of angle steel flange connection are high strength, good stability and sealing, and not easy to deform. The disadvantages are high cost and low efficiency. 2. When the metal air duct is connected by flange, the flange material specification should be selected according to Table 6.3.1 of 'Technical Standards for Building Smoke Prevention and Exhaust SystemMaterial (Class A), the thickness should not be less than 3mm, and should not protrude into the pipe and outside the flange. The spacing of bolt holes should not be greater than 150mm, and there should be screw holes at the four corners of the rectangular air duct flange. (6.3.1) 3. The production of rectangular air ducts with angle steel flanges shall comply with the following requirements: Fabric air duct ventilation ducts 1. The specifications and spacing of connecting bolts and rivets of angle steel flanges shall comply with Table 3.2.2 of the Technical Regulations for Ventilation Piping According to the regulations, the welding seam of the flange should be well fused and full, and there should be no slag inclusions and holes; bolt holes should be provided at the four corners of the flange, and the same batch of flanges of the same specification should be interchangeable. (3.2.2) 2. When the air duct with wall thickness less than or equal to 1.2mm is connected by angle steel flange, the end face of the air duct should be flanged and riveted with rivets. The flanging of the air duct should be flat, close to the flange, with a uniform width, and the flanging height should not be less than 6mm; there should be no cracks and holes at the bite seam and four corners; the riveting should be firm, and there should be no riveting or leakage. 4.5. For more requirements on flanged air ducts, please refer to relevant codes and technical standards: 'Technical Standards for Building Smoke Prevention and Exhaust Systemand many more. 6. Example of angle steel flange project: thin steel plate flange connection 1. Thin steel plate flange connection, usually refers to the connection form of the air duct wall and the flange as a whole. In this way, the end face of the air duct is folded into a flange piece. Flange inserts, spring clips, top screw clips (U-shaped fastening bolts), fixing bolts and other components are used for connection, and the anti-smoke exhaust duct can only use fixing bolts. The flange of this connection method is formed by folding the air duct wall, and the pipe wall is relatively thin, so it is called a thin steel plate flange; and because the flange and the air duct wall are made of the same steel plate, it is also It is called 'common plate flange'. (Note: This form does not require special flange pieces, and it is also called 'flangeless' connection.) Compared with the angle steel flange connection method described above, the thin steel plate flange connection has high installation efficiency and low cost, and is widely used. The market welcomes. The following example is a thin steel plate flanged air duct, the fixing method of this spring clip is not allowed in the smoke prevention air duct. 2. The thin steel plate flange air duct should be connected by bolts, the connection of the air duct interface should be tight and firm, the flange gasket should be non-combustible material (class A), the thickness should not be less than 3mm, and should not protrude into the pipe and flange outside. 3. The height and connection of the thin steel plate flange should be carried out according to the following table, the spacing of the bolt holes should not be greater than 150mm, the four corners of the rectangular air duct flange should be provided with screw holes, and the flange height h should not be less than the value in the following table: four . The large sample drawing of the bolted connection of the thin steel plate flange air duct is as follows: 5. Through the investigation of manufacturers in many provinces, it is confirmed that there are manufacturers in all provinces of the country that can produce according to the specification requirements, and the construction is confirmed on site to be completely feasible. The installation sample drawings are as follows: 6. For more requirements on thin steel plate flanges connecting air ducts, please refer to relevant codes and technical standards: 'Technical Standards for Building Smoke Prevention and Exhaust System. The scope of application is obvious. The strength, stability and tightness of thin steel plate flanges will be worse than that of angle steel flanges. They are usually used in medium and low pressure air duct systems. Sheet steel flanged rectangular ducts shall not be used for high pressure ducts (4.2.3-2). At the same time, I believe that the thin steel plate flanged air duct should not be used in super high-rise buildings over 100 meters and important public buildings. Dispute discussion According to the requirements of the 'Code for Acceptance of Construction Quality of Ventilation and Air Conditioning EngineeringIs the air duct of the high-pressure system air duct, can it use the connection method of thin steel plate flange? 1. According to the requirements of the specification, the air duct system should be divided into four categories according to its working pressure: micro pressure, low pressure, medium pressure and high pressure, and the corresponding types of air ducts should be used. The categories of air ducts shall be classified as specified in the table below. 2. The actual working pressure of the air duct of the smoke exhaust system usually belongs to the medium and low pressure systems. The specification requires that the thickness of the steel plate of the air duct of the smoke exhaust system should be determined according to the high pressure system, which is a strengthening measure taken considering the importance of the smoke exhaust system. Other requirements of the exhaust air duct can usually be determined according to the actual pressure level. For example, the spacing between bolts and rivets can be determined according to the medium and low pressure systems, and the metal air duct of the exhaust system can still be connected by thin steel plate flanges, etc. Wait.
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