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Jacking station
The thrust pit together with the plant and ancillaries to provide the thrust for pipe jacking.

Jet fan
Apparatus with rotating hades giving current of air for ventilation.

Jet-grouting
Grouting of the Earth, done under pressure, to stabilise the ground.

Jumbo
A piece of equipment that consists of a frame that rolls on trades or rather wheels and carries drills for excavation of rock tunnels.

junctionJunction
The intersection between two or more tunnels where they meet/cross.






^{If you think we have omitted a term, email us at tunnels.webmaster@mottmac.com}