Specifically, the concrete transport pump piping should be selected and configured according to the characteristics of the project and construction site, the maximum aggregate size, concrete pump type, transportation distance and ease of transportation. When piping, the length of the pipeline should be shortened as much as possible, and the elbows and hoses should be used less; in the same pipeline, the concrete transport pipes of the same diameter should be selected; when new and old pipes are selected, the new pipes should be arranged for pumping. Where the pressure is high, the pipeline should be fixed firmly, the pipe joints should be tight, and no slurry should be leaked; piping without cracks, no bump damage and no bending should be used.
In addition, there are the following aspects that deserve our attention:
Straight upward pipe
When straightening the pipe, in order to reduce the pressure at the outlet of the concrete pump, the length of the horizontal pipe on the ground should not be less than one quarter of the length of the straight pipe, generally not less than 15 meters. If the conditions are limited, the elbow or the annular tube can be increased to meet the requirements.
When the straight transport distance is large, a pin valve tube should be placed at the root of the transport pipe at the 3-5-meter outlet of the concrete pump Y-tube to prevent the concrete mixture from flowing back.
Side oblique downward pipe
When the height difference is more than 20 meters, a horizontal pipe with a height difference of 5 times should be set at the lower end of the inclined pipe; if the condition is limited, the bending pipe or the annular pipe can be increased to meet the requirement of 5 times the height difference length.
When the slope is greater than 20°, the exhaust valve should be opened first, and the exhaust valve should be closed when the concrete in the lower section of the transport pipe has a certain pressure.
In the hot season construction in summer, it is advisable to cover the concrete conveying pipe with a wet hood cloth or a straw bag to avoid direct sunlight, resulting in loss of concrete slump in the pipe and difficulty in transportation.
Post time: Jan-14-2019