AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

In a cast-in-place mined tunnel, why is the invert commonly placed before the walls and arch?

Because OSHA forbids placing walls first in every case Because invert concrete never needs reinforcement Because the arch must always be shotcrete, never cast-in-place Because a completed invert gives a clean working floor and a stable base for wall and arch forms, unless the approved drawings show a different sequence

Correct Answer:

Because a completed invert gives a clean working floor and a stable base for wall and arch forms, unless the approved drawings show a different sequence

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