GRADE
The specified rise or fall of the proposed bore from a horizontal plane.
GROUND PLANE
The surface upon which the machine is placed.
GROUT
A material such as a cement slurry, sand pea gravel that is pumped into voids.
GUARD
A protective device fitted to the machine to minimize the possibility of inadvertent contact with
hazards.
HELICOID
A section of auger flight.
HEXAGONAL
Of or having six sides or angles.
HOLD DOWN
A hinged or removable assembly that secures the boring machine components together.
HOOK ROLLERS
Devices used to latch or anchor the boring machine to the track.
INADVERTENT CONTACT
Contact between a person and a hazard resulting from the person’s
unplanned actions during normal operation or servicing the machine.
INVERT
The elevation at the bottom of the casing.
MALE HEX CONNECTOR
A solid steel hexagonal pin machined to a close tolerance to engage a
female hexagonal shaped socket of comparable size.
MASTER CASING PUSHER
see
CASING PUSHER
MASTER TRACK
The rear most section of track including the push plate used to stage the boring
machine and transmit the machine thrust into the thrust block.
MIXED FACE
A soil condition that presents two or more different types of material in the path of the
bore.
OPEN CUT
The method of digging a trench.
OPERATOR PRESENCE CONTROL
A control or mechanism designed so that operator presence is
necessary to activate a specific function.
PIERCING TOOL
An impact type of compacting device for boring.
PILING
Rigid supports, driven vertically to provide wall support in the pit.
PIPE PUSHER
A mechanical device used to produce a bore by means of compaction without rotation
or impact.
POWER PACKAGE
The engine and drive line section of a split boring machine or the remote engine
and hydraulic pumps of a power unit.
PUSH BAR
A manual or remote operated locking mechanism that engages stations in the track to
provide a thrusting base for advancement and retraction of the machine.
PUSH PACKAGE
see
BASE PUSH UNIT
Appendix
41
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