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Continued...
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Provides air extraction and cleans by filtration
and wet scrubbing prior to discharge. |
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Provides compressed air, fire fighting systems, emergency
power and workshop/messroom facility. |
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Houses the TBM and back-up system air conditioned sound
proof control room and hydraulic powerpacks and electrical control gear. |
Some 800 drawings were produced, mainly using AutoCad, over a ten
month period. Qualified engineers were on site during the tunnelling period,
assisting with machine operation and modification to suit changing ground
conditions.
Stress analysis of TBM
The 12m long TBM weighing some 800 tonnes was designed to
withstand the full hydrostatic head of sea pressure of 12 bar, exerting a force
of 6,600 tonnes on the front of the TBM.
The machine is propelled forwards by hydraulic rams able to
provide 4220 tonnes of thrust reacted by gripper pads thrust out against the
tunnel bore.
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