A truss has a pair of parallel and longitudinally extending chord rods and transverse
rods interconnecting the chord rods. First and second slides each have a pair of
tubes each fitting over a respective one of the chord rods and slidable longitudinally
therealong and a cross member rigidly interconnecting the tubes and formed with
a throughgoing hole through which passes a respective anchor member projecting
from a tunnel or mine wall. The slides can be longitudinally fixed on the rods.
