Heavy Equipment Operator Certification Exam Prep · Question
Why is 'pipe zone' bedding material typically specified as granular, free-draining, and free of large stones larger than 20mm?
Granular, free-draining material free of large stones provides uniform support along the barrel of the pipe, preventing point loads that can cause pipe failure.
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Question: Why is 'pipe zone' bedding material typically specified as granular, free-draining, and free of large stones larger than 20mm?
Answer options:
- To reduce the cost of bedding material.
- To prevent compaction and allow for natural ground settlement. ✅ To provide uniform, stable support around the pipe and facilitate water migration away from the pipe trench.
- To increase the structural strength of the pipe itself by reinforcing the pipe invert.
Correct answer: To provide uniform, stable support around the pipe and facilitate water migration away from the pipe trench.
Explanation: Granular, free-draining material free of large stones provides uniform support along the barrel of the pipe, preventing point loads that can cause pipe failure. Its free-draining nature helps manage groundwater and directs it away from the pipe, while also maintaining trench stability, as per good engineering practice.
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