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Systematic Technical Solution for Enhancing Pumping Distance in Wet Spraying Boom Trucks
Release time:
2026-03-23
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Summary:
In concrete shotcrete support operations for tunnels, slopes, and other applications, the effective pumping distance of a wet-mix shotcrete boom is a critical performance indicator that determines the equipment’s operational coverage and flexibility. Increasing the pumping distance enables the system to accommodate more complex pipe-routing conditions and longer boom extensions, thereby reducing the frequency of equipment repositioning and enhancing overall construction efficiency. Achieving this objective, however, does not rely on adjusting a single parameter; rather, it requires a systematic approach that encompasses optimization of the concrete mix design, precise setting of equipment parameters, strategic layout of the pipeline network, and adherence to standardized operating procedures.
Pumping resistance primarily stems from friction between the concrete and the pipe wall, local resistance at pipe bends, and the concrete’s inherent internal friction. Therefore, the core principle for increasing pumping distance is to minimize pumping resistance as much as possible while correspondingly boosting the system’s outlet delivery pressure.
I. Optimizing concrete workability is the fundamental prerequisite.
The concrete mix proportion and pumpability directly determine its flow characteristics within the pipeline.
1. Control of Aggregate and Slump: Strictly control the maximum nominal size of coarse aggregate to ensure it does not exceed one-third of the diameter of the delivery pipe. Optimize the sand ratio to ensure sufficient fine aggregate fills the voids between coarse aggregates, thereby forming a good lubricating layer. Maintain the slump at 160mm To 200mm Within the appropriate range, if the particle size is too small, internal friction increases and pipe blockage is more likely; if it is too large, segregation occurs more easily, also increasing resistance.
2. Scientific use of admixtures: High-efficiency water-reducing agents (polycarboxylate-based) can significantly reduce the amount of mixing water, thereby enhancing concrete homogeneity and stability while maintaining workability. When added in appropriate amounts, pumping admixtures can further improve concrete cohesion and lubricity, reducing frictional resistance against pipe walls.
3. Ensure material homogeneity: Verify that the concrete mix exhibits good workability and is free from segregation and bleeding. Once segregation occurs, the concentrated accumulation of coarse aggregate can readily form a blockage core.
II. Precise Equipment Configuration and Maintenance Ensure Power Supply
The performance condition of the wet-spray trolley itself is central to providing sufficient propulsion.
1. Precise configuration of the pumping system: Based on the actual pumping distance and elevation difference, appropriately increase the working pressure setting of the main pumping hydraulic system. This serves as the direct power source for overcoming pipeline resistance over long distances. At the same time, the pumping displacement must be matched accordingly: during the initial stage of long-distance pumping, a lower displacement combined with higher pressure can be used to establish a stable flow regime, which can then be gradually adjusted as needed.
2. Ensure the mechanical system is in good condition: Maintain S Key wear components such as valves, eye plates, and cutting rings must be in good condition; their sealing performance directly affects the effective establishment of pumping pressure. The agitator mechanism should be inspected and adjusted regularly to ensure uniform feeding, thereby preventing material buildup or voids in the hopper that could lead to pumping surges and flow interruptions.
III. Scientific Planning and Pipeline Laying Are Key to Reducing Resistance
The layout and selection of piping have a decisive impact on resistance.
1. Reduce the number and curvature of bends: Piping layout should adhere to the “straight, smooth, and gentle” principle, minimizing 90 °When using elbows, prioritize the use of two. 45 °Use elbow assemblies or large-radius bends to change direction. Each elbow results in significant local pressure loss.
2. Optimize pipeline materials and sealing: Use high-quality conveyance pipes with smooth, wear-resistant inner walls, and periodically rotate severely worn pipe sections to extend service life. Ensure that all pipeline connections are tightly sealed to prevent slurry leakage, which can lead to pressure loss and concrete segregation.
3. Standardize pipe routing and fixation: Avoid “in pipe routing” S “Sharp bends or reverse bends are prohibited. During long-distance horizontal pumping, the pipeline should maintain a consistent, slight downward slope to facilitate air venting and reduce frictional resistance. All pipelines must be securely anchored to minimize vibration caused by pumping surges and to prevent leaks or pipe blockages resulting from loose pipe clamps.”
IV. Standardized Operations and Emergency Response Ensure Reliable Operation
Proper operating practices can effectively maintain the stability of long-distance pumping.
1. Low-Speed Initial Pumping: At the start of pumping, especially when the pipeline is long, an appropriate amount of mortar should be pumped first to lubricate the pipeline. When commencing concrete pumping, operate the pump at a low speed in the forward rotation mode; once the concrete flows smoothly from the pipeline outlet and the pressure stabilizes, gradually increase the speed to the normal pumping rate.
2. Maintain continuous pumping: Avoid prolonged interruptions in pumping as much as possible. If the pump must be stopped for any reason, perform back-pumping at the prescribed intervals. - Operate the concrete pump to prevent concrete from setting in the pipeline.
3. Decisive action in abnormal situations: When pumping pressure rises abnormally and cannot be alleviated through routine operations, it should be promptly recognized as an early sign of pipe blockage. Immediately initiate reverse pumping to draw back a portion of the concrete, eliminate the cause of the blockage, and then resume normal pumping.
Conclusion
Increasing the pumping distance of wet-mix shotcrete rigs is a systematic task that requires close collaboration among batching plant operators, equipment operators, and on-site technicians. It begins with optimizing the mix design, relies on maintaining optimal equipment performance and setting parameters correctly, hinges on a scientifically sound pipeline layout, and is ultimately achieved through standardized operating procedures. By coordinating efforts across these four dimensions, it is possible to effectively overcome conventional pumping-distance limitations, significantly expand the operational capabilities of wet-mix shotcrete rigs, and provide a solid guarantee for efficient, high-quality concrete spray support construction.
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