In the cleaning pipeline before, it is best to Concrete pump the 0.5-1m3 mortar, then stop and finished at all after pumping, and then the plate valve switch, removed the pressure accumulator.

There are two ways to clean pipe concrete pump, is washed and air cleaning, whether it is washing or cleaning gas, the valve should be cleaned tank and hopper. When washing, should open the taper pipe and the clean, and then the water soaked into the cement bag and cleaning ball cylindrical has already cleaned cone tube, then back taper pipe and pipeline, shut in Doumen, then to the bucket filled with water (to keep the water pump continuously); water, until the cleaning ball from the front-end pipeline out of date.

Washing, requires the cutting ring and the eye plate (butterfly valve of concrete pump valve is the plate with the tie bar and upper and lower wear plate) the gap is smaller, there is a large amount of water, strict sealing, do the cleaning ball after water not forward osmosis. Quickly washed at the end, should pay attention to the water in the pipeline, not to the pouring of concrete into place, by not to prejudice the quality of concrete. This method has the advantages of simple operation, less risk, more commonly used.

Gas washing, which uses compressed air blowing, it is to clean the ball water soaked to plug the gas washing joint, the first straight pipes and then phase with adjustable, and at the end of pipe connected to the security cover, (orifice safety cover should be down). Gas washing, to control the compressed air pressure of not more than 0.8MPa; valve to open slowly, when the smooth outflow can open air valve to concrete; gas after washing, to immediately close the valve.

Gas washing require air compressors, strictly in accordance with the provisions of the operation, pipeline has good sealing performance, but the gas can not wash wash very long pipeline, to the distant line subsection cleaning, this method should be considered carefully, very dangerous, so the construction personnel should stay away from export orientation, in order to prevent the pellets or cleaning the ball out wounding.