Cave-ins pose the greatest risk in trenching and excavation operations, and are much more likely than other excavation-related accidents to result in worker fatalities. Other potential hazards include falls, falling loads, hazardous atmospheres, and incidents involving mobile equipment.
What are the hazards of excavation?
Types of Excavation Hazards
- Asphyxiation due to lack of oxygen.
- Inhalation of toxic materials.
- Excavated Soil or Equipment falling on workers.
- Moving machinery near the edge of the excavation can cause a collapse.
- Falling, Slips, Trips.
- The accidental severing of underground utility lines/power lines.
What is the greatest risk with excavations?
Cave-ins pose the greatest risk and are more likely than some other excavation-related incidents to result in worker fatalities.
How can excavation hazards be prevented?
Provide protection by: Set spoils and equipment at least 2 feet back from the excavation. Use retaining devices, such as a trench box that will extend above the top of the trench to prevent equipment and spoils from falling back into the excavation.
What are the hazards of working in trenches and excavations?
The hazards include: Cave-ins or collapses that can trap workers. Equipment or excavated soil falling on workers (e.g., equipment operated or soil/debris stored too close to the excavation). Falling into the trench or excavation.
How many types of excavation are there?
According to Type of Material Excavated
A common method of classifying excavation is by type of excavated material: topsoil, earth, rock, muck, and unclassified.
What you should avoid during excavation works?
What measures should be taken to prevent materials falling onto workers in excavations?
- Do not store spoil or other materials close to the sides of excavations. …
- Make sure the edges of the excavation are protected against falling materials. …
- Always wear a hard hat when working in excavations.
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.
Which of the following is the deadliest excavation hazard?
Cave-ins are a deadly hazard of excavation work.
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 excavation in safety?
Excavation work involves the removal of. soil or a mixture of soil and rock, and even. some of the most experienced workers. have been trapped, buried and injured in.
How do you prevent soil collapse during excavation?
Soil collapse in a trench can be prevented either by side slope or by benching of side wall or by shoring.
What type of soil Cannot be benched?
Type C soil cannot be benched.
What are the three methods of excavation?
Types of excavation
- 3.1 Cut and fill excavation.
- 3.2 Trench excavation.
- 3.3 Basement excavation.
- 3.4 Road excavation.
- 3.5 Bridge excavation.
- 3.6 Dredging.
- 3.7 Over excavation.
Why are trenches dangerous?
Trenches literally are filled with a variety of potential safety and environmental hazards. Cave-ins perhaps are the most feared trenching hazard as one cubic yard of soil can weigh as much as a car. Asphyxiation due to lack of oxygen in a confined space is a major risk. So are inhalation of toxic fumes and drowning.
How is shoring done?
Shoring is the process of temporarily supporting a building, vessel, structure, or trench with shores (props) when in danger of collapse or during repairs or alterations. Shoring comes from shore, a timber or metal prop. Shoring may be vertical, angled, or horizontal.