5.1. Key References for Lecture

Try these first

1. 1.

   What is the purpose of cushioning material in pile driving?

   Hint

   Think about what happens when something heavy hits a fragile object.

2. 2.

   Why must we consider the height of fall when using hammers?

   Hint

   Consider the relationship between height and impact.

3. 3.

   What is the recommended thickness for cushioning materials for concrete piles?

   • 5 cm
   • 10 cm
   • 15 cm

   Hint

   Recall the specific measurement we discussed.

4. 4.

   True or False: Increasing the height of fall while driving piles increases blow efficiency.

   • True
   • False

   Hint

   Think about the effects of increased height on impact.

5. 5.

   You have a hammer weighing 2500 lbs with a fall height of 12 ft, and the average penetration per blow is 1.5 inches over the last five blows. Calculate the safe load using the Engineering News formula.

   Hint

   Ensure you convert the inches to feet properly before plugging in the formula.

6. 6.

   Discuss the potential risks facing a project if the height of the hammer fall is improperly increased for driving concrete piles.

   Hint

   Consider the durability of concrete and its brittle nature.