Final Report Development of Lining and Service Line Extension Systems Compatible with BSB Excavation Rates

摘要

Phase I - Design, of this project has developed a lining and service line extension system which can be used with the Blind Shaft Borer (BSB) during a shaft sinking operation.nUsing precast concrete segments, 12" thick, 8'-4" high and 60° arcnlength, the system is capable of installing a shaft lining with an internal diameter of 22' at a steady state rate of 50' per day. Tonachieve this rate of advance, 2 courses of 6 segments each will be installed and grouted each 8 hour shift, 3 shifts per day.nThe service line extension system has the unique capability of providing an uninterrupted flow of ventilation air down the shaft to the work area.