The key technology for thin flow kind of wet shotcrete machine is as follows:
The antisticking technology of the feeding structure
The even thin flow conveying technology of injection pipe
Accurately measure and even mix technology of liquid accelerator
People always take into account for price factor when choosing wet shotcrete machine, but depreciation charge and fittings consume only occupy three to six percent of shotcrete
cost actually and dominant factor controlling cost is materials expenses, labor cost and power. So we should pay especial attention to price performance ratio but not price. The key factor deciding price performance ratio is as follows:
Service life, reliability and durative serviceability of wet shotcrete machine
complex work efficiency of spraying: productivity, operating rate and rebound degree
Controlling and consumption of accelerator: quality of feed influent, measuring accuracy and hybrid mode
The quality of spraying layer: average strength, coefficient of variation, compactness and surfacing evenness
Working environment: dust volume
Operating performance of nozzle: jet velocity, impulse(recoil), complex controllability for rebound, nozzle dropping slurry and spraying layer dropping clump.
How to control total shotcrete?
Controlling rebound, nozzle dropping slurry and spraying layer dropping clump
Controlling overexcavate and improving level of smooth blasting
Controlling thickness of spraying layer accurately
Improving quality of hanging steel wire mesh for mesh shotcrete (undulating along with rock surface)
Optimizing design, improving the grade of shotcrete and reducing thickness of spraying layer
