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Key measures to prevent pipe blockage in wet spray trucks
Release time:
2026-01-12
Source:
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Summary:
Pipe blockage is one of the most common malfunctions in wet spray rig operations. It not only affects construction efficiency but can also damage equipment. By implementing systematic preventive measures, the incidence of pipe blockage can be significantly reduced, ensuring both construction continuity and cost-effectiveness. The following are key technical measures for preventing pipe blockage.
I. Concrete Mix Proportions and Quality Control
The rationality of the concrete mix proportion is a fundamental prerequisite for preventing pipe blockage. Before construction begins, thorough mix-proportion tests should be conducted to ensure that the concrete has excellent pumpability. Specific control points include:
Aggregate gradation optimization
The aggregate particle size shall meet the equipment’s technical requirements, and the maximum aggregate particle size must not exceed one-third of the conveying pipe diameter. The fine aggregate content should be appropriate to ensure sufficient slurry volume. Well-graded aggregates can reduce frictional resistance and lower the risk of pipe blockage.
Slump Control
The concrete slump should be controlled within the range of 160–200 mm. A slump that is too small will increase pumping resistance, while a slump that is too large may easily lead to segregation. During construction, the slump should be regularly monitored and the water content adjusted promptly as needed.
Admixture usage
Using admixtures such as water reducers and pumping agents in appropriate amounts can effectively improve the workability of concrete and reduce pumping resistance. However, it is important to pay attention to the compatibility between these admixtures and cement to avoid adverse reactions.
II. Key Points for Equipment Operation and Maintenance
Standardized operations and timely maintenance are crucial for preventing pipe blockages.
Pump Speed Control
The pumping rhythm should follow a “slow—fast—slow” pattern. In the initial stage, pump at a low speed; once the pipeline is adequately lubricated, gradually increase the speed to the normal rate. Before concluding, reduce the speed again to prevent concrete residue from remaining in the pipeline.
Lubrication Management
Before pumping, the pipeline must be thoroughly lubricated with mortar; the typical amount of lubricating mortar required is 0.5 to 1.0 m³. During construction, the lubrication system should be kept in proper working order, and the quality and quantity of the lubricating grease should be regularly inspected.
Equipment inspection and maintenance
Before starting daily construction, the following key components should be inspected: whether the clearance between the wear plate and the cutting ring is normal; the condition of wear on the inner wall of the delivery cylinder; whether the swing of the S-valve is flexible; and whether the hydraulic system pressure is stable.
III. Construction Process Control
Fine-grained construction management can effectively prevent pipe blockages from occurring.
Pipeline Layout Optimization
Pipe routing should follow these principles: minimize the number of bends and prioritize the use of large-radius bends; avoid sharp bends and sudden changes in pipe diameter; ensure pipes are securely fixed to reduce vibration; and regularly inspect pipes for wear and tear, replacing severely worn sections promptly.
Interrupt Handling
When construction is interrupted, the following measures should be taken: If the interruption exceeds 30 minutes, the pipeline should be flushed; for short interruptions, reverse pumping should be performed 2-3 times every 10-15 minutes. Before resuming pumping, the pump should first run at a low speed to confirm that the pipeline is clear, and only then should the speed be increased.
Exception Handling
The following situations should be addressed promptly: If the pumping pressure rises abnormally, immediately reverse the pump; if you hear unusual noises, stop the machine and perform an inspection; if concrete segregation is detected, immediately adjust the mix proportion.
IV. Response Measures for Special Circumstances
Different construction environments require targeted anti-blocking measures.
Long-distance pumping
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