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Tunnelling - Engineering

Q1:

Which one of the following methods of tunnelling does not require the use of time bearing :

A Linear plate method

B Shield method

C Compressed air method

D Mechanical tunneler i.e. mole method

E All the these.

ANS:E - All the these.

METHODS REQUIRING USE OF TIMBERS:

* Fore poling method
* Needle beam method
* Army method
* Belgian method
* English method
* American method
* Austrian method
* German method
* method

OTHER METHODS WITHOUT USE OF TIMBERS-
* Linear plate method.
* Shield method.
* Compressed air method.