... and high marsh coal mine tunnel shotcrete construction operations. Dry-Mix Gunite Machine for Coal Mine with features: 1,Advantages:This is ... a high-effective shotcrete machine,which is mainly used for dry-mix, damp-mix shotcreting and steel fiber reinforced shotcreting. ... 4,Thin flow conveying method with vortex flow, so the spraying flow is even, continuous and steady, to improve the ...