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How to handle pipe blockage in a concrete pump truck?
Release time:
2026-05-06
Data source:
Under normal circumstances, ready-mixed concrete forms a columnar fluid in the center of the pumping pipeline, flowing in a suspended state.
✨1. Causes of Pipe Blockage
Under normal circumstances, ready-mixed concrete forms a columnar fluid in the center of the pumping pipeline, flowing in a suspended state. A layer of cement slurry coats the surface of the fluid, acting as a lubricant in contact with the pipe wall, and there is essentially no relative movement between the aggregates. When the movement of some coarse aggregates is obstructed, the movement speed of subsequent aggregates gradually slows down, causing the coarse aggregates to aggregate within the pipeline. The mortar supporting the coarse aggregates is squeezed out, and the remaining gaps are filled by smaller aggregates. This increases the aggregate density, causing the aggregates in that section of the pipeline to expand radially, damaging the cement slurry lubrication layer, increasing resistance to movement, slowing the speed, and eventually stopping the movement, resulting in a blockage.
💥2. Identifying and Resolving Pipe Blockages
(1). Blockage at the Inlet: Pumping and hydraulic systems are normal, with no abnormal sounds or vibrations. Large aggregates or lumps in the hopper are stuck or arched at the inlet, causing blockage. Solution: Reverse the pump to break up the lumps, allowing the ready-mixed concrete to return to the hopper for remixing, then pump forward again. If this doesn't work, manual cleaning is required.
(2). Blockage at the Discharge Outlet of the Distribution Valve: The pumping system suddenly stops, accompanied by abnormal sounds and strong equipment vibration, but no corresponding vibration in the pipeline. Solution: Pour 15-30L of cement slurry into the hopper and repeatedly pump forward and reverse to force the passage open. If this method is ineffective, manual removal is necessary; disconnect the connecting pipe and remove any debris from the valve.
(3). Blockage at the S-pipe valve: Blockage at the S-pipe valve develops gradually. The main reason is that after pumping ready-mixed concrete, it is not flushed with high-pressure water in a timely manner, causing concrete residue to remain inside the S-pipe. Over time, this residue thickens, accumulates, and solidifies, causing a blockage. Solution: After pumping ready-mixed concrete, the pump body and S-pipe must be thoroughly flushed with high-pressure water. If flushing is ineffective, use a chisel to remove the residue until it is completely clean.
(4). Blockage in the ready-mixed concrete conveying pipeline: When the conveying pressure gradually increases, but the hopper level does not decrease, no material is discharged from the pipeline outlet, the pump vibrates, and the pipeline also experiences strong vibration and displacement, it can be determined that the pipeline is blocked. Identifying the blockage location: Blockages generally occur in bends, tapered pipes, and areas subject to vibration. In this case, a small hammer can be used to tap along the pipeline; a dull sound indicates a blockage, while a crisp sound indicates normal flow. Listen carefully; a rustling sound is normal, while a harsh sound indicates a blockage.
✅3. Solutions
When pipe blockage occurs, immediately begin repeatedly pumping in both forward and reverse directions to gradually draw the ready-mixed concrete from the pump outlet back into the hopper for remixing before re-pumping. Alternatively, use a wooden hammer to tap the pipe, combined with pumping in both directions, to try and clear the blockage. If these methods are ineffective, the blockage is severe. After identifying the blocked section, remove the pipe and clean it thoroughly with high-pressure air, a heavy hammer, or high-pressure water. Once completely clean, reconnect the pipe and continue pumping ready-mixed concrete.
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