AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

Which systems are commonly used to keep a TBM or microtunnel on line and grade?

Guessing heading from surface traffic noise Spirit level on the muck skip only Laser, total-station, or gyro guidance, with invert grade especially critical on gravity-drainage tunnels Magnetic compass alone, without a designed alignment

Correct Answer:

Laser, total-station, or gyro guidance, with invert grade especially critical on gravity-drainage tunnels

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