Glossary
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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.
- 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.
- Alignment
- Planned and actual location in the vertical and horizontal direction of the product from the entry pit to the exit pit.
- 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.
- Angular Deflection
- The angle between two consecutive pipes
- Annular Filler
- Material for grouting the annular space between the host pipeline and the lining system.
- Annular Space
- The void created by the difference in diameters between the shield and jacking pipe.
- Articulated Head
- A shield of two sections where the front section can be deflected to steer the shield or cutting head.
- 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.
- Auger MTBM
- Microtunnel boring machine (MTBM) that uses auger flights passing through the product pipeline to remove the excavated soil.