Concrete pump and concrete pump pumping main points

Concrete pump and concrete pump pumping main points also tips Introduction (1) Concrete pumpability. Concrete pump pumping requirements can be satisfied, when necessary, with the ratio determined by test pumping concrete pumping. ① coarse aggregate maximum diameter than the js1000 for construction and concrete portable mini cement mixer diameter of the conveyor shall be: pumping height at 50m below the gravel not larger than 1: 3, for a pebble not greater than 1: 2.5; pumping height at 50 ~ 100m time , should be in the 1: 3 to 1: 4 range; pumping height at 100m above, should be in 1: 4 to 1: 5 between. Flakiness particle content of not more than 10%. ② different pumping height, into the pump concrete slump according to the following selection. Pumping height (m) 30 or less 30 ~ 60 60 ~ 100 100 Slump (mm) 100 ~ 140 140 ~ 160 160 ~ 180 180 ~ 200 ③ pumping concrete water-cement ratio is preferably (0.4 to 0.6): 1. ④ pumping concrete sand rate should be 38% to 45%. The fines should be used in the sand, the amount of sand by 0.315m sieve not less than 15%. ⑤ Pumpcrete minimum cement content of 300kg / m3. (2) concrete pump should start pumping after the appropriate amount of water to wet the concrete pump hopper, concrete cylinder and the feed pipe in direct contact with the concrete site. Pumping water and then use one of the following methods to lubricate these parts: pumping grout; pumping 1: 2 cement mortar; pumping coarse aggregate except outside other than to distribute and cement mortar. Lubricating grout or cement mortar should be decentralized cloth can not be concentrated in the same place pouring. (3) at the beginning of pumping, concrete pumps should be in a slow, constant speed running state, and then gradually accelerate. And should observe the work pressure concrete pump and each system until the truck concrete cement mixer cmh260l 300l 350l 400l 450 500 600l system is working properly behind each normal speed pumping. (4) work as continuous concrete pumping, concrete cylinder piston should be kept running at maximum stroke, in order to maximize the performance of the concrete pump and concrete cylinders can wear a uniform in the longitudinal direction. (5) If there is high pressure concrete pump and unstable temperature rise. When the delivery tube vibration and pumping obvious difficulties phenomenon can not be forced to pump, should immediately investigate the cause be excluded. It can be obtained with a mallet percussion duct elbow. Conical tubes and other parts, and slow or reverse pumping pumps to prevent clogging.