L245N pipeline gas bend

L245N intermediate frequency bend shocked the whole country to fix the original two fixed rollers, an adjustment roller, adjust the fixed roller distance, the finished pipe is bent. This method is widely used. If spiral tube is produced, the curvature can be increased. Swelling method: one is to place rubber in the tube, the upper part of the punch compression, so that the tube protruding shape; Another method is hydraulic bulging forming, filling the middle of the pipe with liquid. (1) After the operation, all the concrete in the hopper and pipe must be output, and then the pump, hopper and pipe should be flushed. The output residual concrete can be used for concrete construction of tunnel paving bottom and side wall. Economical pipeline cleaning method is water cleaning (compressed air cleaning is used when sewage cannot be treated, which will not be introduced in this paper), each time can be cleaned more than 260m pipelines. (1) Performance parameters of the water pump: pressure not less than 4.3mpa, flow not less than 180L/min. (2) connecting pipe with the diameter of the pipe, the stuffing (rubber piston, sponge, cement bag roll, etc.) must be tightly into the pipe than the conveying pipe of a larger diameter of the pipe. (3) When filling material adopts sponge ball or cement bag roll, sponge ball or cement bag roll must be soaked with cement slurry. (4) Cleaning conveying pipe distance is long, before cleaning to press in an appropriate amount of cement mortar. When cleaning, personnel should stay away from the pipe mouth, and set up a protective device to avoid rushing out of things and injuring people.