The International Society for Trenchless Technology
Glossary
There are 211 entries in this glossary.| Term | Definition |
|---|---|
| Face |
The undisturbed soil immediately ahead of the shield. |
| Ferro-Cement |
Material comprising cementitious and steel elements to form a structural lining, which is either placed in situ in a man-entry size pipeline or tunnel, or is preformed into segments for later installation. |
| Filter Cake |
A thin layer of bentonite drilling fluid that seals the borehole preventing the flow of liquids from the borehole into the native soil. |
| Fluid Assisted |
Method of guided drilling using a combination of mechanical drilling and Boring/Drilling pressurised fluid jets to provide the soil cutting action. |
| Fluid Density |
See Mud Weight |
| Fold & Form Lining |
Method of pipeline rehabilitation in which a liner is folded to reduce its size before insertion and reversion to its original shape by the application of pressure and/or heat. |
| Frac-out |
See Hydrofracture |
| Free Boring |
Method of auger boring without a casing. |
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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