Construction Technology of Large Diameter Nitrogen Injection Hole
LV Li-qiang · Exploration Engineering(Rock & Soil Drilling and Tunneling) · 2010
Gas content can be effectively decreased by pressure injecting nitrogen with high fire retardancy nitrogen or liquid nitrogen to extruding and exhausting gas,and improve coal production security.As passage between the surface and the tunnel,nitrogen injection hole should be with large diameter,good verticality and channel protection property.The paper discussed the construction technology of large diameter nitrogen injecting hole with successful case.