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1. Annular Filler
(Glossary)
Material for grouting the annular space between the host pipeline and the lining system. ...
2. Bentonite
(Glossary)
A natural clay material having thixotropic properties which is used as a basic ingredient for drilling muds and lubricants. ...
Type of microtunnelling machine in which mechanical pressure is applied to the material at the face and controlled to provide the correct counter-balance to earth pressure to prevent heave or subsidence. ...
4. Ferro-Cement
(Glossary)
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 installa ...
Nondestructive method for detecting subsurface structures, voids, discontinuities, and changes in material. GPR uses radar pulses transmitted into the ground to image the subsurface by recording electromagnetic ...
6. Grouting
(Glossary)
The process of filling voids or modifying/improving ground conditions. Grouting materials may be cementitious, chemical or other mixtures. In microtunneling grouting may be used to fill voids around the ...
Open shield in which manpower is used to excavate the material but which has some steering capability. ...
8. Packing
(Glossary)
Material placed between pipe joints to distribute the jacking loads. ...
Internal cleaning of pipelines, particularly sewers, prior to inspection, usually with water jetting and removal of material where appropriate. ...
10. Slurry Chamber
(Glossary)
A chamber located behind the cutting head of a slurry microtunneling machine, in which excavated material is mixed with the slurry for transport to the surface. ...
11. Slurry Separation
(Glossary)
A process in which excavated material is separated from the circulation slurry. ...
12. Slurry TBM
(Glossary)
A microtunnel method that uses tunnel Boring Machine (TBM) or shield with closed face which employs hydraulic means for removing the excavated material and balances the ground water pressure. ...
13. Spoil
(Glossary)
Earth, rock, and other materials removed during installation. ...
Method in which a pipe is jacked through the ground without mechanical excavation of material from the front of the pipeline. ...
15. Tunneling
(Glossary)
... support system at the location of material excavation. ...
16. Pipe Jacking & Microtunneling
(News/Guidelines)
... a crane to hoist pipe sections into the jacking shaft, and various trucks and loaders to transport spoil off site.  MTBMs have a rotating cutting head to excavate the ground material, a crushing ...
... and de-silting hydro cyclones. The residual material is removed for disposal. ISTT offers specialized training courses on horizontal directional drilling. Contact ISTT at istt.com for more information ...
18. Pipe Bursting
(News/Guidelines)
... diverse in size, material type, and function including water, sewer, or gas pipelines. Pipe bursting is used to replace brittle pipes such as clay, concrete and cast iron through the application of a ...
19. Communication & Outreach
(Pages/Generic)
... educational materials such as technical papers and trenchless glossary of terms, and responding to user inquiries.  ...
20. Close-Fit Slip Lining
(News/Guidelines)
... is possible because of the “memory” properties of thermoplastic materials.  Thermoplastic materials will change shape when force is applied to the material either through the application of compression ...
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