31. For initial surveys of tunnels, the following activities are involved:
1.Marking portal point with concrete pillars on the ground
2.Marking tunnel obligatory points on the topographical maps
3.Preliminary setting of the tunnel on the topographical Survey of India maps
4.Driving lines between the fixed obligatory points
The correct sequence of the activities is:
1.Marking portal point with concrete pillars on the ground
2.Marking tunnel obligatory points on the topographical maps
3.Preliminary setting of the tunnel on the topographical Survey of India maps
4.Driving lines between the fixed obligatory points
The correct sequence of the activities is:
32. In Belgium method of tunnelling
33. The advantages of providing a pair of tunnels as compared to only one large highway tunnel is:
34. Which one of the following methods is adopted for permanent drainage of tunnels?
35. What is the correct sequence of the following events of construction of a shaft in rock?
1) Drilling and blasting
ii) Timbering
iii) Pumping
iv) Mucking
Select the correct answer
1) Drilling and blasting
ii) Timbering
iii) Pumping
iv) Mucking
Select the correct answer