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With the rapid development of highway construction, some domestic and imported pump concrete equipment has been widely used by construction units. However, in the concrete pouring operation, due to improper use, resulting in equipment blockage occurs from time to time, which not only affects the progress of the project, but also directly affect the quality of the project. ...
With the rapid development of highway construction, some domestic and imported pump concrete equipment has been widely used by construction units. However, in the concrete pouring operation, due to improper use, resulting in equipment blockage occurs from time to time, which not only affects the progress of the project, but also directly affect the quality of the project.Small Road Roller - Shanghai Doan Machinery Techno...gy Co.,Ltd
Blocking reasons
Under normal circumstances, the formation of concrete in the center of the pump tube columnar fluid flow in a suspended state. The surface of the fluid is coated with a layer of cement slurry, and the cement slurry layer is in contact with the pipe wall as a lubricant, so that the aggregate does not substantially move relative to each other. When the coarse aggregate in some of the aggregate movement is blocked, the back of the aggregate velocity of the affected gradually slowed down, resulting in the formation of coarse aggregate aggregate pipe, coarse aggregate support is squeezed away, the remaining gap Filled by small aggregate. In this way, the aggregate density increases, so that the pipeline within the pipeline radial expansion of the aggregate, cement slurry lubrication layer is damaged, the movement resistance increases, the speed slows down until the movement stopped and clogged.
Judgment and Elimination Method of Blocking
Plugging at the feed inlet
Phenomenon: Pumping action and hydraulic system are normal, no abnormal sound and vibration, hopper has a larger aggregate or agglomeration, stuck in the feed port or arch and blocked.
Exclude: the pump reverse operation to damage the caking, the concrete back to the hopper to re-mixing, and then forward pumping. If it does not work, you need to manually clean up, be excluded.
Dispensing at the dispensing valve outlet
Phenomenon: pumping system action suddenly interrupted, and abnormal sound, the device has a strong vibration, but no corresponding vibration within the pipe.
Excluded method: to the hopper into the 15 ~ 30L slurry, repeated, reverse start the pump, forcing access to open. If this method is invalid, can only be manually excluded, remove the associated tube, remove valve debris.
S The pipe valve is blocked
Phenomenon: S pipe valve plug is gradually formed, the main reason is the pump finished concrete, there is no timely use high-pressure water rinse, resulting in concrete residue in the S tube, the course of time gradually thickening, accumulation consolidation, resulting in congestion.
Remedy: Pumping concrete after the end, be sure to use high-pressure water and the S-tube pump rinse. When the flushing is invalid, can be used to knock the drill to remove the residue until thoroughly clean.
Blockage of concrete pipeline
Phenomenon: when the delivery pressure gradually increased, while the hopper level does not decline, the pipe outlet is not expected, the pump vibration, the pipeline is also accompanied by a strong vibration and displacement, can be judged to be blocked.
Blockage of the judgments: blockage generally occurs in the elbow, cone, and the vibration of the lot. At this point, you can use the hammer along the pipe beating, dull place for the plug Department; sound crisp at the normal. With the ears, a rustle of normal, harsh sound for the plug Department.
Remedy: When blocking occurs, should be taken immediately to repeat the positive and reverse pump method, and gradually pump out the concrete suction hopper to re-mix and then transport. Can also be wooden hammer percussion method, combined with positive, reverse pump, so clear; when the above method is invalid, indicating serious congestion. Identify the block, the tube removed, with high pressure air or heavy hammer percussion or high pressure water rinse, to be thoroughly cleaned, then connect the pipeline to continue pumping concrete work.
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