Practice Types Of Pile Hammers And Selection Criteria (6.1) - Driving Stresses in Piles

Practice: Types of Pile Hammers and Selection Criteria

Lesson 6.1Driving Stresses in Piles

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9 questions

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6 sample questions

Question 1.
What is a cushioning material?
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Think of something that absorbs impact.
Question 2.
What is the minimum thickness of a wood cushion?
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Recall the number mentioned in the lectures.
3Question 3.
What is driving stress?
- Stress during service life
- Stress experienced while driving
- Stress not relevant to design
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Consider when stress is at its peak.
4Question 4.
True or False: Heavier hammer weight with a longer fall height increases blow efficiency.
- True
- False
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Reflect on what happens to driving stress.
Question 5.
A project requires driving a 500 lb concrete pile into a soft clay soil. The only available hammer weighs 400 lb and has a fall height of 8 ft. Calculate the blow energy and discuss if this setup will work effectively.
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Remember to check the relationship between hammer weight and pile weight.
Question 6.
Design an appropriate cushioning setup for a concrete pile with a driving stress of 185 psi. Given that timber cushions are hot, what thickness would be advisable based on typical guidelines?
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Refer back to the minimum requirements mentioned in earlier discussions.

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