Mine Master drill rigs (also known as underground drill rigs, master rigs or face drilling rigs) are primarily utilized in underground mines (hard rock & soft materials) and tunnel construction.
[pdf] The was developed by Sir to excavate the in 1825. However, this was only the invention of the shield concept and did not involve the construction of a complete tunnel boring machine, the digging still having to be accomplished by the then standard excavation methods.
[pdf] Compared with the drill and blast method, TBM tunnelling has significant advantages with high construction efficiency, low project cost, conducive to environmental protection, favorable stability contr.
[pdf] 
