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Systematic Strategies for Optimizing the Cleaning Method of the Pumping Pipeline in Wet Spraying Bogies
Release time:
2026-05-06
Source:
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Summary:
Cleaning the pumping pipeline of a wet-mix shotcrete boom pump is a critical step that determines construction efficiency, equipment lifespan, and operating costs. Improper cleaning can lead to hardened concrete residue, which, at best, increases pipeline resistance and accelerates wear, and, at worst, causes complete blockage, resulting in severe unplanned downtime and costly repairs. The goal of optimizing the cleaning process is to achieve thorough internal pipeline cleaning in the most efficient, economical, and environmentally friendly manner, thereby creating optimal conditions for the next spraying operation.
I. Clarifying the Consequences of Incomplete Cleaning and Optimization Objectives
Residual concrete gradually accumulates on the inner wall of the pipeline, forming an irregular, highly rigid adherent layer. This results in the following during the next pumping operation:
1. The effective pipe diameter decreases, leading to a significant increase in flow resistance and higher energy consumption;
2. The concrete’s flowability is compromised, exacerbating segregation and increasing the risk of pipe blockage;
3. Accelerates wear on new pipelines, creating a vicious cycle.
Therefore, the core objective of optimization is to ensure that, following each operation, the inner wall of the pipeline returns to a smooth condition close to its initial state.
II. Selection and Optimization of Core Cleaning Methods
The cleaning method shall be flexibly selected and combined based on the concrete’s properties, pipeline length, site conditions, and environmental protection requirements.
1. Water-washing method (traditional method)
Principle: High-pressure water is used to propel a cleaning ball (made of sponge or a rubber piston) through the pipeline, thereby pushing out the concrete.
Optimization highlights:
Ensure the quality and proper fit of the cleaning ball: the diameter of the cleaning ball should be slightly larger than the inner diameter of the pipeline to achieve effective sealing and scraping.
Water Pressure and Flow Control: Water pressure must be sufficient and stable, and the water flow must be adequate to completely flush all concrete residue out of the pipeline. For cleaning, a small amount of cement can be added in advance to form a thin slurry, which provides better lubrication.
Drawbacks and limitations: high water consumption, generation of large volumes of waste slurry, and the need for accompanying treatment facilities such as sedimentation tanks, which limit its applicability at sites with water scarcity or stringent environmental protection requirements.
2. Air Washing Method (Dry Cleaning)
Principle: A air compressor generates high-pressure air to propel a specially designed cleaning piston (or several closely arranged wet sponge balls) rapidly through the pipeline, using the airflow to blow out any remaining wet concrete.
Optimization highlights:
Air Pressure and Dryness: A stable and sufficiently high air pressure must be provided (typically required to reach a specified megapascal level). Compressed air must be dried and filtered to prevent moisture from compromising cleaning performance.
Applications of piston cleaning: Using a dedicated cleaning piston is more reliable than using a sponge ball alone, as it provides better air tightness and ensures more thorough cleaning.
Advantages: Virtually no wastewater is generated, making it environmentally friendly and fast. Disadvantages: It places high demands on the equipment’s air supply; improper operation can lead to concrete “spitting” or “blasting,” necessitating the strict establishment of a safety perimeter.
3. Combined Water and Steam Washing Method (Recommended Highly Efficient Method)
Principle: A small volume of water or cement slurry is first pumped into the pipeline to wet the interior and propel a cleaning ball; the flow is then switched to high-pressure air, which drives the water/slurry column and the cleaning ball forward. This approach combines the lubricating effect of water washing with the speed and efficiency of air flushing.
Optimization highlights:
Precise control of sequence and timing: The key is to ensure rapid, seamless switching between water and air, thereby establishing a continuous “water–air column” propulsion system behind the cleaning ball.
Wide applicability: This method is particularly well-suited for long-distance applications, large-diameter pipelines, or situations where concrete slump is low, effectively addressing the limitations of single-method approaches and making it one of the most widely recognized and efficient cleaning methods today.
III. Standardized Operating Procedures for the Cleaning Process
Regardless of the method used, standardized operating procedures must be followed:
1. Pre-treatment at the end of work: Immediately after stopping concrete pumping, add an appropriate amount of clean water or diluted mortar to the hopper and perform several forward-and-reverse pumping cycles to dilute the high-concentration concrete remaining in the S-valve and the front section of the delivery pipeline, thereby reducing the difficulty of the initial cleaning.
2. Proper installation of the cleaning system: Ensure that the cleaning balls are securely installed and that all pipe connections are tightly fastened. During air flushing or combined air–water flushing, all fittings must be capable of withstanding high pressure.
3. Perform Cleaning and Observation: Initiate the cleaning procedure and assign a dedicated personnel to closely monitor the pipeline outlet. When the cleaning ball (piston) is observed to be fully expelled, followed by the discharge of essentially clear water or air, it indicates that the main pipeline has been thoroughly cleaned.
4. Individual cleaning of critical components: After the main pipeline has been cleaned, nozzles, rubber hoses, bends, and other areas prone to residue must be disassembled, rinsed separately, and inspected, as these are often the root causes of blockages.
IV. Verification of Cleaning Performance and Subsequent Management
1. Effect Verification: After cleaning, illuminate the inner wall of the pipeline with a high-intensity flashlight, or use a small endoscope to inspect blind spots such as bends, to confirm that there are no large-scale deposits remaining.
2. Environmentally sound disposal of waste: The waste slurry and wastewater generated during cleaning contain alkaline substances such as cement; these must be directed to a pre-prepared sedimentation tank for neutralization and settling. The clarified water can be recycled, while the solid waste must be disposed of in compliance with regulations as construction waste. Any unauthorized discharge is strictly prohibited.
3. Pipeline Maintenance: After cleaning is completed, pipes that are not to be used immediately should have their ends sealed to prevent foreign matter and moisture from entering. Regularly inspect the inner wall of the pipeline for wear, and promptly replace or reorient any sections where wear exceeds allowable limits.
Summary
Optimizing the cleaning procedures for the pumping pipelines of wet-spray boom trucks is a systematic endeavor that tightly integrates process selection, standardized operations, and environmental management. At its core, this approach entails abandoning crude, ad hoc flushing practices and instead, based on specific operating conditions, scientifically selecting and meticulously implementing either water flushing, air flushing, or combined water–air flushing, while establishing standardized procedures that cover the entire process—from operation and inspection to waste disposal. Such optimization not only ensures that equipment is always maintained in optimal standby condition, significantly reducing the risk of pipeline blockage, but also effectively controls maintenance costs and environmental risks, thereby serving as a critical guarantee for the efficient and sustainable operation of wet-spray boom trucks.
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