Selection and application of the minimum gas injection volume of air drilling with raise boring machine

Gas injection volume is the key parameter of air drilling with raise boring machine, and determination minimum gas one technologies to improve speed shorten period. Based on characteristics technology, construction technique as circulating medium studied, double-channel structural direct circulation system are discussed. On basis summarizing analyzing principle calculation methods, required for rock carrying in engineering machine calculated by using velocity method. The research results provide a design parameters great significance expanding application range method realizing safe rapid shaft.