Glossary Of Terms - Barbco TRIBOR Series Operation Manual

THRUST BLOCK A section of steel plate, concrete or a combination of steel and concrete located
between the master track push plate and rear pit wall to provide stability and accept the thrusting force
of the boring machine.
THRUST PACKAGE The bottom section of a split boring machine containing the cylinders and push
bar.
TORQUE The measure of the rotary force available at the front drive.
TORQUE LIMITER A rotary slip clutch used to protect the final drive.
TRACK A set of longitudinal rails mounted on cross members that support and guide a boring machine.
TRACK BRAKE A mechanical device to provide a limited resistance to movement between the
machine and the track.
TRACK PINS Steel pins to be driven through holes in the track into the base of the pit.
TRACK ROLLER see CAM FOLLOWER
TRANSMISSION A gear reduction unit located between the power source and final drive.
TRENCH BOX A pre-constructed set of side plates and adjustable cross members to prevent the walls
of the pit from collapsing.
TWO SPEED CONTROL A hydraulic valve that increases the flow of oil to the cylinders to provide rapid
low power motion of the machine.
UPSET The inadvertent action of a boring machine that rotates the machine and track from its normal
upright position to another position.
UNDERGROUND UTILITY Active or inactive services or utilities already in the ground in the area of the
proposed bore.
WATER LEVEL An instrument that uses a tube filled with water to indicate the elevation of the lead
section of casing.
WATER TABLE The elevation of the ground water.
WING CUTTERS Appendages on cutting heads that will open to increase the cutting diameter of the
head when turned in a forward direction, and close when turned in a reverse direction.
WIPERS see WING CUTTERS
Appendix 43