1. Selected materials without roughly
The amount of cement slurry should be sufficient; the particle size of the aggregate should be strictly screened. The maximum particle size of pebble should be less than 1/3 of the diameter of the delivery pipe, the maximum particle size of crushed stone should be less than 1/4 of the diameter of the delivery pipe, and the sand content should be greater than 40% The amount should be sufficient and kept above the stirring shaft. Pay attention to check the slump of the concrete. Those who are unqualified must use it after second mixing. Generally, it is 8-18cm, and it is generally 15cm when the distance is long and the height is large.
2.
Concrete pump operated strictly
druing the pumping of the
concrete pump, set up a special person to inspect the leak tightness of the catheter, and immediately find and repair the leak. When the pumping is finished, you must clean the catheter and set up a special person to inspect and supervise. Before each pumping, check whether the delivery pipe is unobstructed. Try to avoid blockage at the elbow.
3. Manage and Water Washing Carefully
Pump down slowly for the first time, and speed up properly after normal pumping. Generally, the pump is turned on every 5 minutes to prevent pipe blocking during intermittent periods. Concrete that has reached the initial setting state cannot be pumped. Cover the straw bag outside the duct to control the temperature and water in summer Cool down and cover insulation in winter.