At what depth must an excavation be supported?

Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. If less than 5 feet deep, a competent person may determine that a protective system is not required.

What is the depth of excavation?

Shallow excavations are defined as being anything less than 1.5 metres deep, which really is not very deep at all; a relatively short person could comfortably see over the top. Deep excavations, on the other hand, are defined as being any excavation which is more than 4.5 metres in depth – a considerable height indeed.

At what depth do you need shoring?

Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock. If less than 5 feet deep, a competent person may determine that a protective system is not required.

What is the safest way to get out of a deep excavation?

Support the excavation as you go along. Prevent people and materials falling in – with barriers strong enough not to collapse if someone falls against them. Keep plant and materials away from the edge. Avoid underground services – use relevant service drawings, service locating devices and safe digging practice.

How do you protect deep excavation?

Falling or dislodging material. Loose materials – may fall from spoil heaps into the excavation. Edge protection should include toeboards or other means, such as projecting trench sheets or box sides to protect against falling materials. Head protection should be worn.

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What needs to be done before you start to excavate?

The first and primary step involved in the excavation is to find out the extent of soil and Clearing of construction site is of unwanted bushes, weeds and plants. Setting out or ground tracing is the process of laying down the excavation lines and centre lines etc. on the ground before the excavation is started.

What are 3 main protection methods against cave-ins?

To prevent cave-ins: SLOPE or bench trench walls. SHORE trench walls with supports, or. SHIELD trench walls with trench boxes.

How deep is a deep excavation?

What is Deep Excavation? Deep excavation is excavation that goes down more than 4.5m (or 15ft) deep into rock or soil. Excavations can range from shallow to deep and can be general or focussed.

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