Tunnel Engineering

The length of the needle beam used in needle beam method of tunnelling is usually_____.

  • A. 2 m to 4 m
  • B. 2.5 m to 6 m
  • C. 4 m to 7 m
  • D. 5 m to 6 m
Answer: Option D.
Explanation: 

IS 14665 gives details about elevators. It specifies the number, capacityof elevator and number of floors to be served.

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