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Definitions (185)
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intermediate jacking station
A fabricated steel cylinder fitted with hydraulic jacks that is incorporated into a pipeline between two pipes segments. Its function is to distribute the jacking load over the pipe string on long drives.
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adapter ring
A fabricated ring, usually made from steel, that serves to mate the microtunneling machine to the first pipe section. The purpose of the adapter ring is to create a waterproof seal between the machine and the spigot of the first joint.
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advance rate
Speed of advance of a pipe jack or other trenchless installation through the ground, generally expressed as either millimetres per minute or metres per day.
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alignment
Planned and actual location in the vertical and horizontal direction of the product from the entry pit to the exit pit.
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allowable bend radius
The degree of deflection that the drill pipe and product can safely tolerate without risk of damage to the pipe or product.
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angular deflection
The angle between two consecutive pipes
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annular filler
Material for grouting the annular space between the host pipeline and the lining system.
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annular space
The void created by the difference in diameters between the shield and jacking pipe.
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articulated head
A shield of two sections where the front section can be deflected to steer the shield or cutting head.
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auger boring
A technique for forming a bore from a start or drive shaft to a reception shaft by means of a rotating cutterhead. Spoil is removed back to the drive shaft by helically wound auger flights rotating in a steel casing. This equipment may have limited steering capability.
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