In concrete pouring operation, due to improper use, pumping concrete equipment plugging failure occurred, not only affected the progress of the project, but also directly affect the quality of the project. 1 plugging reason Under normal circumstances, the concrete in the center of the pipe to form a columnar fluid flow was suspended. The surface of the fluid is covered with a layer of grout, which acts as a lubricant in contact with the wall of the pipe, with virtually no relative movement between the aggregates. When some aggregates in the coarse aggregate are obstructed from moving, the velocity of the aggregate behind gradually gets sluggish, resulting in the accumulation of coarse aggregates in the pipe. The mortar supporting the coarse aggregate is squeezed away and the remaining gap Filled with small aggregates. In this way, the aggregate density increases, so that the section of the pipeline along the pipeline radial expansion of the composition, the cement slurry lubrication layer is destroyed, increased resistance to movement, slow down, until the movement stops and clogging. 2 blockage of the location to determine and eliminate the clogging at the feed inlet: pumping action and hydraulic system are normal, no abnormal sound and vibration, hopper larger aggregate or caking, stuck in the feed inlet Or arched and clogged. Remedy: Turn the pump in reverse to destroy the agglomerate, return the concrete to the hopper, re-mix and then pump it forward. If it does not work, you need to manually clean up, to be excluded. Discharge valve at the distribution block at the phenomenon of congestion: pumping system suddenly interrupted action, and abnormal sound, the device has a strong vibration, but no corresponding vibration within the pipeline. Remedy: Pour into the hopper 15 ~ 30L grout, repeatedly positive and reverse pump, forcing the access open. If this law is invalid, it can only be manually excluded, remove the connected pipe, remove the valve debris. S tube valve at the blockage phenomenon: S tube valve blockage is gradually formed, the main reason is pumping finished concrete, there is no timely flush with high pressure water, resulting in concrete remaining in the S tube, over time gradually thickened, pile consolidation, Cause blockage. Remedy: After the pumping of concrete, be sure to use high-pressure water to clean the pump and S tube. When flushing is ineffective, brazing can be used to remove the debris until it is completely clean. Concrete pipeline congestion phenomenon: When the delivery pressure gradually increased, while the hopper material level does not decline, the pipe outlet is not expected, the pump vibration, the pipeline is also accompanied by strong vibration and displacement, can determine the pipeline blockage. Blockage of the judgment: Blockage generally occurs in elbows, cones, and the vibration of the lot. At this point, you can use a small hammer along the pipe beat, the sound dull at the block; sound crisp at normal. Listen with ears, rustle sound as normal, there is a harsh sound for the blockage. Remedy: When the plugging occurs, it should immediately take positive and negative pump method, and gradually pump the concrete pump back to the hopper to re-mix before delivery. Also available wood hammer percussion method, combined with positive and negative pump to make it clear; when the above method is invalid, indicating serious blockage. Identify the blockage, the pipe removed, with high-pressure wind or heavy hammer percussion or high-pressure water rinse, to be thoroughly cleaned, and then connect the pipeline to continue pumping concrete work.
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