TBM
Subterranean boring machine
TBM is an abbreviation with several meanings depending on context.
In engineering, it stands for tunnel boring machine—the massive equipment that excavates underground passages for subways and utilities.
In Mormon contexts, TBM means true believing Mormon, often used by former members to describe those who remain devout.
In medicine and aviation, TBM has technical meanings specific to those fields.
Rotating blade-holding component
- shieldHandheld defensive armor
- gripperDevice that grasps firmly
- conveyor beltEndless loop transporter
- bentoniteAsh-derived absorbent clay
Act of unearthing
- breakthroughSudden important advance
- alignmentCorrect relative positioning
- overcutTrim beyond intended amount
- steeringControlling direction of movement
Urban rail transit
- subwayUnderground transit passage
- railway tunnelEnclosed passage for trains
- hydropowerElectricity from flowing currents
- headraceChannel supplying waterwheel
tailrace · road tunnel · undersea tunnel · Channel Tunnel · Crossrail · transit · utility · pipeline
cutterhead
Rotating blade-holding component
- shieldHandheld defensive armor
- gripperDevice that grasps firmly
- conveyor beltEndless loop transporter
excavation
Act of unearthing
- breakthroughSudden important advance
- alignmentCorrect relative positioning
- overcutTrim beyond intended amount
metro
Urban rail transit
- subwayUnderground transit passage
- railway tunnelEnclosed passage for trains
- hydropowerElectricity from flowing currents
headrace · tailrace · road tunnel · undersea tunnel · Channel Tunnel · Crossrail · transit · utility · pipeline
fault zone
Region of crustal weakness
sand · pressure · permeability · geology · overburden
Hand tools for excavation
cut-and-cover · manual labor · hand tools · elevated railway
TBMhand drill
Manual hole-boring tool
power drill · pickaxe · cordless drill · jackhammer · chisel