Preliminary Design of an Automated Drill and Blast Machine.
Wetherell-RB; Crane-CJ; Porter-WB
NTIS: PB/252-829 Available for Reference At Bureau Libraries :46 pages
This report presents the results of a preliminary design concept for an automated drill and blast machine (adbm). The design concept was the first phase of a four-phase program and was based on hercules' experience with explosives for conventional drill/blast/muck (dbm) tunneling and robbins' experience as a tunneling boring-machine (tbm) manufacturer. The overall objective of the study was to design a machine that could combine dmb operations into a single automated machine capable of remaining at the tunnel face during all operations. Currently produced tbm's have proven capable of penetrating rock of any hardness. However, these machines are not economical in hard or abrasive rock formations. All objectives of this first phase were not achieved. The major problem was the time required for currently used mucking equipment to clear the face. The anticipated improvement in advance rate of the adbm over currently used tbm's cannot be achieved until the muck cycle can be reduced to 20 minutes per round.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/252-829 Available for Reference At Bureau Libraries
Hercules, Inc., & Robbins Company