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Normet Alpha 20 Tier 3 Underground Wet Mix Concrete Sprayer
Alpha 20 Tier 3 is a diesel-hydraulically driven underground wet mix concrete sprayer designed for reliable shotcrete application in tunnels up to 5 m × 5 m. The machine is equipped with the Normet BS7622 concrete pump delivering a theoretical pumping capacity of 20 m³/h and a maximum pumping pressure of 50 bar, enabling efficient spraying of stiff concrete mixes.
The machine features a 7 m maximum boom reach with 360° nozzle rotation, 120° tilt and automatic orbitor (60 rpm) for optimized spraying performance. The accelerator system is based on a hydraulically driven peristaltic pump with a 350 L stainless steel tank. Powered by a 120 kW Deutz TCD 2013 L4 Tier 3 diesel engine, Alpha 20 offers hydrostatic 4-wheel drive, four-wheel steering with crabwalk, and radio remote control for safe and precise operation underground.
Technical specifications – Alpha 20 Tier 3
| Parameter | Value |
|---|---|
| Application | Underground wet mix concrete sprayer |
| Max tunnel profile | Up to 5 m × 5 m |
| Concrete pump | Normet BS7622 |
| Pump output | 20 m³/h (theoretical) |
| Pumping pressure | Max 50 bar (190 bar hydraulic) |
| Pumping cylinder diameter | 6" (152.4 mm) |
| Cylinder stroke | 760 mm |
| Accelerator system | Hydraulic peristaltic pump, 0.5–16 L/min, max 7 bar |
| Accelerator tank capacity | 350 L (stainless steel) |
| Concrete line diameter | 2 1/2" (63.5 mm) |
| Boom reach | Max 7 m |
| Nozzle rotation | 360° rotation, 120° tilt, automatic orbitor 60 rpm |
| Engine | Deutz TCD 2013 L4, 120 kW @ 2300 rpm, Tier 3 |
| Transmission | Hydrostatic 4-wheel drive |
| Steering | Four-wheel steering with crabwalk |
| Max speed | 14 km/h |
| Fuel tank | 105 L (stainless steel) |
| Hydraulic oil tank | 390 L |
| Electrical system | 24 VDC (2 × 80 Ah batteries, 55 A alternator) |
| Dimensions (L × W × H) | 9000 × 2290 × 2550 mm |
| Operating weight | 7500 kg |
TechCom supplies spare parts for Normet Alpha 20 Tier 3, including BS7622 pump components, accelerator dosing systems, hydraulic assemblies, diesel engine parts, and wear components to ensure stable and efficient underground shotcrete operations.