Best practice concrete spraying for underground mine openings

At Bauma 2010 in Munich Normet introduced the Spraymec 8100 VC, the most advanced model for concrete spraying in its Spraymec series. It is an electro-hydraulic self-propelled mobile concrete sprayer that optimises concrete spraying in projects with variable tunnel cross sections. It provides efficient spraying from one set-up in tunnels of up to 10.3 m in height and 16 m in width. The maximum vertical spraying reach is 14 m. The compact design enables the mobile sprayer to perform spraying in cross-sections from 15 to 140 m2. More information will be published in International Mining’s July issue aricle on mine support vehicles.

The Spraymec 8100 VC is designed for high performance sprayed concrete applications and the use of alkali-free accelerators. It features the latest state-of-the-art spraying process control system – NorSmart. The NorSmart concrete sprayer control system provides efficient, productive and high-quality concrete spraying with functions like:

  • Low-pulsation spraying and pumping
  • Accurate and reliable accelerator dosing (control system integrated into concrete output) 
  • Accurate spray boom and nozzle movements and positioning
  • Real-time control and fault diagnostics of the spraying process, including a kit for accelerator, concrete and ambient temperature measurement
  • Logging of all spraying process related data and USB data transfer
  • Comprehensive vehicle fault diagnostics.

The Normet concrete spraying pump has a theoretical maximum pumping capacity of 40 m3/h when the casting option is selected. The standard pumping capacity for spraying operations is 30 m3/h. The concrete pipe support arm at the forepart of the concrete pipeline makes cleaning of the concrete line easy and fast after each shift. The upper part of the concrete hopper can be turned away for easy service of the concrete cylinders.

Spraymec 8100 VC has an onboard compressor with a capacity of 12 m3/min for efficient and high quality sprayed concrete application. Four-wheel drive and four-wheel steering makes the Spraymec 8100 VC easy to manoeuvre in demanding driving conditions and limited spaces.

The innovative layout of the Spraymec 8100 features a revolutionary service technician’s passage through the whole sprayer. This allows genuinely full and easy access to all service points on the sprayer. With the new layout, two 1,000 litre accelerator containers or one, a 400 litre water tank and a large tool and storage box, together with other options can easily be placed on the sprayer.