The International Society for Trenchless Technology
Glossary
There are 211 entries in this glossary.| Term | Definition |
|---|---|
| Back Reamer |
Cutting head attached to the leading end of a drill string to enlarge the pilot bore during a pull-back operation to enable the product pipe to be installed. |
| Backacter |
A mechanical device for excavation within an open shield |
| Beacon |
See Sonde |
| Bent Sub |
Offset section of drill stem close behind the drill head that allows steering corrections to be made by rotation of the drill string to orientate the cutting head. |
| Bentonite |
A natural clay material having thixotropic properties which is used as a basic ingredient for drilling muds and lubricants. |
| Bore |
Void which is created to receive a pipe, conduit or cable. |
| Breakout Wrench |
Manual or hydraulic tool used to connect or break tool joints at access points forward of the drill rig. |
| Burp Hole |
Excavation along the drill path to relieve excess pressure that has created hydrolock. |
| Butt-end |
Term used for square end jacking pipes. |
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Thematic words
trenchless technology involves installation replacement renewal underground utilities minimum excavation surface disruption several construction techniques methods details technologies successfully water sewer industrial pipelines electrical conduit fiber optics particularly attractive option urbanized heavy pedestrian traffic numerous existing crossing roadways other transportation corridors rivers waterways install rehab replace located environmentally sensitive areas