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Systematic Technical Measures for Reducing Pumping Resistance in Wet Spraying Bogies
Release time:
2026-03-25
Source:
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Summary:
In wet concrete spraying operations, pumping resistance is a critical factor that limits spraying efficiency, determines the maximum pumping distance, and affects equipment energy consumption. Excessively high pumping resistance increases equipment load, raises hydraulic system oil temperature, and significantly elevates the risk of pipe blockage. Effectively reducing pumping resistance is therefore the core technical objective for achieving efficient, stable, and long-distance pumping. This requires the implementation of systematic measures across multiple dimensions, including optimizing concrete mix proportions, improving pipeline layout, and refining equipment operation.
Pumping resistance primarily stems from friction between the concrete and the pipe wall, local resistance caused by pipe bends, and inter-particle friction within the concrete mix. Consequently, all measures to reduce pumping resistance are focused on minimizing these three types of resistance.
I. Optimizing the concrete mix proportion is the fundamental prerequisite.
The workability of concrete itself is the intrinsic factor that determines pumping resistance.
1. Precise control of aggregate gradation: Strictly control the maximum nominal size of coarse aggregate (typically not exceeding one-third of the pipe diameter). One third ), and optimize the gradation of fine aggregates. Maintaining an appropriate sand ratio ensures that there is sufficient fine aggregate to fill the voids between the coarse aggregates, thereby forming a stable skeletal structure and a lubricating layer—key factors in reducing internal friction.
2. Maintain the optimal slump: Keep the concrete slump stable at 160mm To 200mm is most ideal within this range. If the slump is too low, the concrete becomes overly dry and stiff, resulting in high internal friction and poor workability; if the slump is too high, segregation and bleeding are likely to occur, leading to aggregation of coarse aggregate and increased friction, which may even cause pipe blockage.
3. Scientific use of admixtures: High-efficiency water-reducing agents can significantly lower the water-to-cement ratio, enhancing workability and paste envelopment while maintaining strength. When added in appropriate amounts, high-quality pumping admixtures improve concrete cohesion and water retention, and they form a lubricating film on the pipe walls, directly reducing the coefficient of sliding friction between the concrete and the pipe wall.
II. Scientific Planning and Pipeline Maintenance Are Key to Reducing Resistance
The condition of the piping system has a decisive impact on pumping resistance.
1. Minimize pipe bends: Pipeline layout should adhere to the principle of “straight, smooth, and gradual.” Reduce bends as much as possible. 90 °When using elbows, prioritize the use of two. 45 °Use elbow assemblies or large-radius bends to change the flow direction. Each elbow constitutes a significant source of local resistance loss.
2. Select high-quality pipelines and implement standardized maintenance: Use dedicated conveyance pipes with smooth, wear-resistant inner walls. Regularly inspect the inner wall for signs of wear, promptly replace sections that exceed allowable wear limits, or rotate pipe sections to change the load-bearing surface and extend service life. A smooth, even inner wall is the foundation for reducing frictional resistance.
3. Ensure tight sealing and proper fixation: All pipe clamps must be securely tightened, and sealing rings must be intact, to prevent pressure loss and changes in concrete performance caused by grout leakage. Pipelines shall be firmly installed to avoid swaying under pumping-induced impacts, while maintaining smooth pipeline routing and eliminating sharp bends and reverse curves.
III. Standardizing Equipment Operation and Maintenance Ensures Reliable Operation
Proper operation and maintenance can effectively maintain low-resistance pumping conditions.
1. Adequate initial lubrication: Before pumping concrete, an appropriate amount of cement mortar or a dedicated lubricant must be pumped first to ensure thorough adhesion to the inner wall of the pipeline, thereby forming an effective lubricating film. This is a critical step for reducing initial frictional resistance and ensuring a smooth start-up.
2. Maintain continuous, uniform pumping: Keep a stable, steady pumping rhythm and avoid frequent starts and stops or sudden changes in speed. The material level in the hopper should always be kept above the mixing shaft to prevent air from being drawn in, which could cause interruptions in concrete flow and impact.
3. Optimize equipment performance parameters: Based on the actual pumping distance and operating conditions, appropriately set the pressure and displacement of the pumping system. For long-distance pumping, initially adopt a “low-pressure, low-speed” mode to establish a stable flow regime, then gradually adjust to normal operating parameters.
4. Strengthen maintenance of critical components: Conduct regular inspections and adjustments. S Ensure proper clearances for wear parts such as valves, eye plates, and cutting rings to maintain tight sealing. Seal failure can result in severe internal leakage, which not only leads to pressure loss but also disrupts the continuity of pumping and increases pressure fluctuations.
Conclusion
Reducing the pumping resistance of wet-spray boom machines is a comprehensive task that requires coordinated efforts among concrete batching plant operators, equipment managers, and machine operators. It begins at the source, with scientifically sound and well-balanced concrete mix designs; it unfolds during the process, through optimized and streamlined pipeline routing; and it culminates in execution, relying on standardized, meticulous equipment operation and maintenance. By synergistically addressing these three dimensions, system energy consumption can be significantly reduced, pumping efficiency and delivery distance can be improved, pipe blockage failures can be effectively prevented, and robust technical support can be provided for the efficient, stable, and economical operation of wet-spray boom machines.
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