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RECEIVING PIT see EXIT PIT
RETRACT The motion of the machine away from the face of the entrance pit.
REVERSE The counterclockwise rotation of the auger as viewed from the machine end.
SADDLE A vertical support mechanism to hold the casing in position while starting (collaring) the bore.
SADDLE MACHINE see CRADLE MACHINE
SAFETY SIGN A notice attached to the machine which advises the nature and severity of a potential
hazard which can cause injury or death. It can also provide instructions to reduce or eliminate the
hazard.
SENSING HEAD A small device used in conjunction with a water level and mounted to the lead section
of casing to provide constant monitoring of casing elevation.
SHEET PILING see PILING
SHIELD A guard that, alone or with other parts of the machine, provides hazard protection from the
area covered.
SHORING see PILING
SKIN FRICTION Resistance to thrust caused by earth pressure around the casing.
SOCKET see FEMALE HEX CONNECTOR
SPLIT DESIGN A boring machine having the capability of being broken down into two or more
elements to reduce the lifting weight.
SPOIL Earth, rock and the like removed when making a bore.
SPOIL CHAMBER The inside area of the casing pusher containing the spoil ejectors.
SPOIL EJECTOR A set of paddles, rotating in close proximity to the inside of the casing pusher that
extrude spoil from the spoil chamber.
SPOIL EJECTOR DOOR A door that partially or completely closes the spoil ejector opening of the
casing pusher.
STEERING HEAD A movable lead section of casing that can be adjusted to steer the bore on a
proposed grade.
SUMP A depress installation of a pump for water removal.
TEETH see BITS
TEST BORE Probing by auger or coring tool, usually vertically, at the site to determine the earth
conditions.
THRUST BEARING An external bearing used to isolate the final drive from the thrusting force of the
machine.
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Appendix
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