Design and Fabrication of Instrumentation for Remote Sealing of Underground Coal Mine Passageways. Volume I.

摘要

This report describes instrumentation that is part of a system for extinguishing mine fires by pumping material through surface boreholes to seal off all underground passageways leading to the fire area. Major instrumentation systems include a closed-circuit television (CCTV) probing system and an acoustic seal checking system. The latter consists of a speaker probe, a receiver probe,and related signal processing equipment. All probes can be winch-deployed down a 6-inch diameter borehole. The CCTV unit can be rotated 360degrees in the horizontal plane,and contains sufficient lighting to reliably assay conditions for sealing or rescue within a 200-foot radius. The acoustic seal checker monitors the completion of a seal as it progresses by use of probes lowered through boreholes on either side of the seal.