Excavation

Yasir Kayani
Mind Map by Yasir Kayani, updated more than 1 year ago
Yasir Kayani
Created by Yasir Kayani about 5 years ago
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Excavation
1 hazards
1.1 materials falling onto people working in the excavation
1.2 people being struck by plant
1.3 people & vehicles falling into excavation
1.4 undermining nearby structures
1.5 contact with underground services - gas/electricity
1.6 ingress of water
1.7 fumes from vehicles/plant (co2)
1.8 methane/other gases
1.9 contaminated land
1.10 lack of oxygen
1.11 biological hazards e.g. leptospirosis, drains/sewers, rubbish and waste
2 control measures
2.1 supported exceptions with timber
2.2 trench boxes
2.3 services supported
2.4 tied ladders for access
2.5 batter or bench sides of excavation
2.6 spoil stored away from sides of excavation
2.7 signs and barriers/edge protection
2.8 PPE e.g. hard hats/high vis clothing
2.9 keep vehicles away/use stop blocks
2.10 trained and competent plant operators
2.11 temporary support for nearby structures if needed
2.12 backfill or cover excavation when not being worked on
3 undergorund services
3.1 look around for obvious signs of underground services e.g. drains, patching of surface etc.
3.2 use cable locators to trace any services. mark the ground accordingly
3.3 use services plans provided by utility company - these are only a guide
3.4 get cables isolated and made dead before work begins if possible
3.5 dig trial holes by hand - use shovels and spades, not fork and picks
3.6 hand dig if in doubt (particularly for plastic cables which cannot be detected)
3.7 have emergency procedures/contact in place
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