The International Society for Trenchless Technology

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1. Adapter Ring
(Glossary)
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 ...
2. Drilling Fluid
(Glossary)
Largely comprised of water, drilling fluids usually include bentonite and if warranted other additives such as soda ash, polymers, and detergents to address water and soils properties that could compromise ...
3. Exit Seal
(Glossary)
Same as launch seal except for the retrieval of the machine at the reception shaft. Used in high ground water to prevent the loss of ground. ...
4. Eye (Pipe Jack Eye)
(Glossary)
A sealing device placed in the shaft walls of the thrust and reception pits to allow the shield and pipes to enter and exit without soil, water and slurry flowing into the shaft. ...
5. Infiltration
(Glossary)
The downward movement of water from the atmosphere into soil or porous rock. The unintended ingress of ground water into a drainage system. Water from the surrounding ground which enters through defects ...
The total quantity of water from both infiltration and inflow without distinguishing the source. ...
7. Inflow
(Glossary)
Flow which enters the sewer generated by rainfall or an industrial discharge or other particular connection. Water discharged into a sewerage system and service connections from sources on the surface ...
8. Launch Seal
(Glossary)
A mechanical seal, usually composed of a rubber flange that is mounted to the wall of the drive shaft. The flange seal is distended by the MTBM as it passes through, creating a seal to prevent water or ...
MTBM has a closed faced shield from which excavated soil is removed using a slurry, which also counterbalances groundwater and earth pressures. The machine is guided by a laser or other survey device mounted ...
10. Mud Weight
(Glossary)
The weight of the drilling fluid measured against the weight of water used to determine the solids content of the fluid or slurry. Excess solids can adversely affect the efficiency of the drilling system ...
11. Piezometer
(Glossary)
Small-diameter monitoring wells that allow ground water levels or pressures to be monitored. ...
12. Preparatory Cleaning
(Glossary)
Internal cleaning of pipelines, particularly sewers, prior to inspection, usually with water jetting and removal of material where appropriate. ...
13. Product Pipe
(Glossary)
Pipe used for the conveyance of water, gas, sewage, and other products and services. ...
14. 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. ...
15. Water Jetting
(Glossary)
Internal cleaning mechanism of the cutterhead in which high-pressure water is sprayed from nozzles to help remove cohesive soils. ...
16. Pipe Jacking & Microtunneling
(News/Guidelines)
... as a remotely-controlled, guided, pipe-jacking operation that provides continuous support to the excavation face by applying mechanical or fluid pressure to balance groundwater and earth pressures. Support ...
... fluids are mixed to address the solid conditions that are anticipated along the planned path. During installation returns can be tested to confirm that the correct water-additive mixture is being used.  ...
18. CIPP Lining
(News/Guidelines)
Cured in Place pipe (CIPP) can be used to rehabilitate sanitary sewers, storm drains and pressure pipelines for water, gas and process effluents. Circular pipe from 100-2,700mm and a variety of noncircular ...
19. Slip Lining
(News/Guidelines)
... large pipes, such as filling the pipe with water and grouting in stages. Segmental slip lining is typically used to insert Glass Reinforced Plastic (GRP) pipes into circular and non-circular pipes. The ...
20. 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 ...
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