|
|
|
|
|
These machines are used to produce a circular excavation either between
two existing levels in an underground mine or between the surface and an
existing level in a mine. In raise boring, a pilothole is drilled down to
the lower level, the drillbit is removed and replaced by a reamer head
having a diameter with the same dimension as the desired excavation and
this head then is rotated and pulled back up towards the machine.
SME, 1
|
|
About Us DeveloDex™ OptiMall™ Success Tools Tabularium™ WebRef™
|
