- Raise borer
A raise borer is a machine used in
miningfor drillinga circular hole or "shaft" between two levels of a mine. The borer is set up on the upper level of the two levels to be connected. A small-diameter hole is bored to the level required, using a conventional drill bit- the diameter of this hole is only large enough to accommodate the drill string. Once the drill has broken into the open on the target level, the small bit is removed and a reamerbit, of the required diameter of the shaft, is attached to the drill string and raised back towards the machine. Any spoil from the operation falls away from the cutting surface due to gravity, removing the need for large amounts of water or drilling mudto remove the spoil, although some water may be necessary for cooling the reamer. Machine variants can also ream horizontal shafts via the same method.
The "boxhole borer" is a variant of a raise borer that is used when there is not enough space on the higher of the two levels to be connected. The boxhole borer is set up on the lower level, drills a pilot hole as a guide, then drives the reamer bit along the pilot hole from the lower level to the upper. Precautions have to be taken to redirect falling spoil from the machine, and to reinforce the drill string.
The term "raise" refers to a vertical or inclined opening which joins two levels of a mine.
Beaconsfield mine collapsenecessitated the use of a raise borer, operated in a boxhole manner, due to the need for minimal vibrations during the rescue.
* [http://www.maden.hacettepe.edu.tr/dmmrt/index.html Dictionary of Mining, Mineral, and Related Terms]
* [http://www.raiseboring.com/ Photos of several raise boring machines]
Wikimedia Foundation. 2010.
Look at other dictionaries:
raise borer — ● raise borer nom féminin Synonyme de foreuse de cheminée. ● raise borer (synonymes) nom féminin Synonymes : foreuse de cheminée … Encyclopédie Universelle
Borer — may refer to:* Insects: ** Moths: *** Podosesia syringae *** Melittia cucurbitae , a pest of cucurbit vines *** Ostrinia , pests of maize and other plants ** Anobiidae, a family of beetles, especially: *** Anobium punctatum ** Woodboring beetles… … Wikipedia
borer — ● borer nom masculin (anglais borer, vrille) Terme anglo saxon servant à désigner certains types de mineurs continus (twin borer) ou de machines à creuser par alésage (raise borer). Synonyme de foreur (insecte). ● borer (synonymes) nom masculin… … Encyclopédie Universelle
Raise — A raise or Raise is a term which can have several meanings:*Raise (Lake District), the name of the 12th highest mountain in the Lake District on the north west coast of England *Raise borer, a raise is a shaft in a mine which joins two levels by… … Wikipedia
tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
Beaconsfield Mine collapse — The Beaconsfield Mine collapse occurred on 25 April 2006 in Beaconsfield, Tasmania, Australia. Of the 17 people who were in the mine at the time, 14 escaped immediately following the collapse, one was killed, and the remaining two were found… … Wikipedia
2010 Copiapó mining accident — Copiapó mining accident redirects here. For the 2006 accident in the Carola Agustina mine, see 2006 Copiapó mining accident. 2010 Copiapó mining accident Rescue efforts at San José Mine near Copiapó, Chile on 10 August 2010 Date … Wikipedia
Shaft mining — Abandoned mine shafts in Marl, Germany. A … Wikipedia
Derrumbe de la mina San José — Operación San Lorenzo Vista de la mina durante las labores de rescate … Wikipedia Español
буровой станок для проходки восстающих выработок — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN raise borer … Справочник технического переводчика