(1) After the operation, all the concrete in the hopper and the pipeline must be output, and then the pump, hopper and pipeline are flushed, and the residual concrete output can be used for concrete construction such as tunnel bottoming and side wall. The economical pipe cleaning method is to wash with water (clean air is used when the sewage cannot be treated, this article will not be introduced), and the pipe can be cleaned more than 260m each time.
(2) Precautions for washing with water:
1 Performance parameters of the pump used: the pressure is not less than 4.3MPa, and the flow rate is not less than 180L / min.
2 The connecting pipe adopts a reducing pipe, and the packing (rubber piston, sponge ball, cement bag roll, etc.) must be tightly placed in the reducing pipe which is one step larger than the conveying pipe.
3 When the stuffing is made of sponge balls or cement bags, the sponge balls or cement bags must be saturated with the cement slurry.
4 When cleaning the conveying pipe for a long distance, press the appropriate amount of cement mortar before cleaning.
5 When cleaning, personnel should be away from the nozzle and equipped with protective devices to avoid accidental injury.