Crossword Clue:

a supporting timber in a mine

AnswerCrossword Clue
JOISTSupporting timber in home construction
JOISTTimber supporting a floor.
PILETimber supporting a dock
PILEHeavy timber supporting a dock.
BRACESupporting timber
JOISTSupporting timber
CROSSPIECESupporting timber
YBEAMBranched supporting timber.