Q107
What is the main purpose of installing a collar during shaft sinking?
A.
Prevent water inflow
B.
Strengthen shaft bottom
C.
Provide stable top for equipment
AnswerD.
Reduce dust
Answer: Option C
Solution
Answer: Option C
Solution:
Shaft collar is a reinforced structure at the surface opening.The correct answer is: Provide stable top for equipmentSupports hoisting structures and prevents surface collapse.Often constructed with concrete.