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Technical and Economic Basis for Selecting Wet-Spray Trolley Systems
Release time:
2026-07-28
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Summary:
As the core equipment for concrete shotcrete support in tunneling, slope stabilization, and other construction projects, the scientific selection of wet‑spraying rigs directly impacts construction quality, efficiency, and overall project costs. Faced with a market offering diverse technological approaches and an extensive array of specifications and models, informed equipment selection requires a systematic analysis of project requirements, equipment performance, technical compatibility, and life‑cycle costs.
I. Core Selection Criteria: Alignment Between Project Requirements and Technical Specifications
1. Project Scale and Construction Intensity
Large, long tunnels and key projects: For projects with tight schedules, large shotcrete volumes, and high requirements for continuous operations, priority should be given to large, fully hydraulic wet‑spraying rigs. These machines deliver substantial shotcrete output (theoretical capacity can reach…). 30 m³/h As described above, the high degree of mechanization enables sustained high-intensity operations while significantly reducing manual labor intensity.
Small and medium-sized tunnels, sporadic projects, or repair and reinforcement works: For conditions involving low construction intensity, narrow working faces, or frequent relocation, small and medium-sized wet‑spraying rigs or truck‑mounted wet‑spraying machines may be considered. These equipment options require lower capital investment, offer greater mobility and flexibility, and can adequately meet project requirements.
2. Concrete Properties and Mix Proportion Requirements
The selection of equipment must be compatible with the concrete mix proportions specified in the project design.
Concrete slump: Modern wet-mix spraying techniques tend to employ low slump ( 80-150mm ) Concrete with reduced rebound. When selecting equipment, it is essential to verify that the pumping system—whether a piston pump or a screw pump—can reliably and efficiently convey such concrete without frequent pipe blockages.
Maximum aggregate size and fiber addition: Verify the maximum aggregate size that the equipment can accommodate (typically…). 10-15mm ). If fiber-reinforced concrete is specified, special attention must be paid to whether the equipment’s flow‑through components and nozzle designs have been optimized for fibrous materials, in order to prevent fiber agglomeration and blockage.
3. Benchmarking of Key Performance Parameters
Maximum spraying capacity: The equipment’s theoretical maximum spray volume shall exceed the project’s average construction requirements, with an appropriate margin to accommodate peak demand.
Robot arm working range: The robot arm’s vertical and horizontal spraying coverage must encompass the entire construction surface of the tunnel or slope, minimizing equipment repositioning and ensuring there are no spraying blind spots.
Maximum conveying distance / Height: The equipment’s horizontal pumping distance and vertical pumping height must meet the requirements of the longest pipeline layout, making it particularly suitable for long-distance operations at isolated work sites.
II. Selection of the Technical Roadmap for Core System Configuration
1. Pumping System Selection
Hydraulic piston pump: Its advantages include high discharge pressure, long delivery distances, and large pumping capacity, making it suitable for high‑intensity, large‑volume projects and low‑slump concrete. Its disadvantages are a relatively complex structure and stricter requirements for concrete mix proportions and aggregate gradation.
Screw pump (extrusion type): Its advantages include smooth delivery, minimal pulsation, good compatibility with concrete, and resistance to pipe blockages. Its disadvantages are relatively low discharge pressure, limited conveying distance and lift height, and the need for regular replacement of rubber hoses due to wear. It is best suited for small- to medium‑volume concrete spraying with slightly higher slump.
2. Accelerator Addition System
This is a critical system that affects jetting quality and material costs.
Measurement accuracy: It is essential to select a system equipped with high-precision metering pumps and closed-loop control to ensure that the dosage of accelerating agent is precisely and continuously adjustable relative to the concrete pumping rate. This is a core technology for controlling rebound rates and guaranteeing concrete strength.
Mixing method: Prioritize the on‑site instantaneous mixing technique at the nozzle, which ensures uniform blending, optimal rapid setting, and the lowest rebound rate.
3. Chassis and Powertrain
Chassis type: Select based on site road conditions. Crawler‑type chassis offers lower ground pressure, making it suitable for navigating muddy and uneven tunnel environments; wheeled chassis provides greater maneuverability, ideal for multi‑worksite projects with frequent relocations.
Power source: Electric models offer low operating costs and minimal noise, making them ideal for tunnels with a stable power supply; diesel models provide unrestricted mobility, suitable for construction sites without power or those with good ventilation.
III. Economic Considerations and Comprehensive Support Factors
1. Initial investment and operating costs: A full life-cycle cost analysis is required. In addition to comparing equipment purchase prices, it is essential to comprehensively evaluate the costs of consumables—such as wear-resistant pipes, rubber linings, and rapid-setting agent nozzles—along with maintenance convenience, failure rates, and the rebound rate of spraying operations, which directly impacts material costs.
2. Operational and Maintenance Convenience: The equipment should feature a user-friendly human–machine interface to streamline operating procedures. A well‑designed serviceability, with easily accessible routine maintenance points and readily replaceable wear parts, can significantly reduce downtime and enhance equipment utilization.
3. Technical Training and After-Sales Service: The supplier shall provide comprehensive training on operation and maintenance, as well as timely, professional technical support and spare parts supply, which are essential for ensuring the equipment’s long-term stable operation.
Summary
The system selection for wet‑spraying rigs is a systematic decision‑making process that, based on clearly defined project requirements, balances equipment performance, technical specifications, cost‑effectiveness, and service support across multiple dimensions. Decision makers should move away from selection approaches driven solely by price or a single metric and adopt a holistic, full‑life‑cycle perspective. Through thorough technical benchmarking and comprehensive cost analysis, they can ultimately choose the wet‑spraying rig whose technical capabilities align perfectly with project needs while delivering optimal long‑term economic benefits, thereby laying a robust equipment foundation for the safe, high‑quality, and efficient execution of the project.
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