Stamping spiral pipe is widely used
The traditional pipeline will destroy its own continuity after punching, resulting in pipeline deformation, deformation and even fracture, which will seriously damage its ventilation effect. If it is replaced with spiral tube, it is necessary to ensure not only the punching effect, but also the tube stiffness and hardness under the action of spiral bone. After testing, the hardness of spiral duct fan is three times that of traditional ductless equipment, so it is widely used in laboratory and other fields.
Pipe reinforcement is to ensure its performance, but not all pipes need reinforcement. Except spiral pipe, the diameter of round pipe is greater than or equal to 80mm, the pipe length is more than 1250mm, and the total area is more than 2M2, which needs to be reinforced; The side length of rectangular pipe is greater than 630mm, the side length of insulated pipe is greater than 800mm, the pipe length is greater than 1250mm, or the unilateral area of low-pressure air duct is greater than 1.2m2, and the medium and high-pressure pipes are greater than 1m2.
Bolts, nuts, washers and rivets selected by the pipeline shall be made of materials that meet the performance of the pipeline and do not produce electrochemical corrosion or galvanization or other anti-corrosion measures. Blind rivets cannot be selected. Reinforcement frame and reinforcement shall be adopted. The pipeline shall not be connected by flange, and the forms of S-shaped cutting, right angle cutting and vertical cutting shall not be used.
In the installation and construction of underground works, the mature use of complete sets of production equipment such as automatic production line of spiral air duct, plasma cutting machine, circular elbow forming machine and caulking welding machine makes the production of circular air duct change from manual operation to mechanized and automatic operation; The development and application of supporting construction technologies such as connection of inner expansion core pipe without gasket and the introduction and improvement of construction machinery have increased the installation and construction efficiency of spiral air duct several times. These technologies and equipment improve the quality, speed and appearance technology of ventilation engineering construction, and promote the overall development of spiral duct installation and construction technology.