Tunnel Engineering

For transferring the tunnel alignment through shafts, we adopt the following steps:
1.Hanging two or more plumb lines in the shaft
2.Determining the bearing of the plumb lines i.e. plumb plane
3.Suspending a 35 kg weight by each plumb line
4.Immersing the weights of both the plumb lines in the buckets containing water
The correct sequence of steps is:

  • A. 1, 2, 3, 4
  • B. 4, 3, 2, 1
  • C. 1, 3, 2, 4
  • D. 2, 1, 4, 3
Answer: Option A.

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

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