Excavation

Question 0

List three types of protection commonly used and providing workers with safety in any trench that is more than 1.5m deep.

Answer 0

Shoring
trench boxes
cutbacks

Question 1

An engineer must certify any shoring in trenches deeper then?

Answer 1

6 m

Question 2

hard and compact soil walls must be cut back to no less then?

Answer 2

30° from the vertical

Question 3

Other soil types must be cut back?

Answer 3

At least 45° from the vertical

Question 4

List four things that must be taken into consideration for any excavation over 1.5 m in depth.

Answer 4

1. soil structure
2. weather in moisture conditions
3. proximity of other structures and vibration
4. placement of waste soil