What is the greatest danger associated with excavations?

What are some dangers of excavations?

Top 5 excavation safety hazards

  • Cave-ins. Trench collapses kill an average of two workers every month, making this a serious threat to worker safety. …
  • Falls and falling loads. Workers and work equipment can fall into an excavated area. …
  • Hazardous atmospheres. …
  • Mobile equipment. …
  • Hitting utility lines.

12 февр. 2018 г.

What is the most serious and deadly excavating and trenching hazard?

Probably the most common hazard at any work site is the threat of cave-in. A cave-in occurs when walls of an excavation collapse. Cave-ins can be deadly.

What are some dangers of excavations quizlet?

The dangers of excavations come from the possibility of cave-ins, in addition to the possibility of the lack of oxygen (asphyxiation), fire, accidental break of underground utility lines (such as gas, electricity), collapse due to moving machinery near the edge of the excavations, inhalation of toxic materials, and …

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What are some dangers of excavations OSHA?

Trench collapses, or cave-ins, pose the greatest risk to workers’ lives. When done safely, trenching operations can reduce worker exposure to other potential hazards include falls, falling loads, hazardous atmospheres, and incidents involving mobile equipment.

What are three 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 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.

Why are cave-ins so 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.

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

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. Provide ladder access to get in and out.

Why are trenches dangerous?

Life in the trenches was dangerous for many reasons. The more obvious dangers included enemy fire, poisonous gas attacks and artillery shelling. While the trenches offered general protection from enemy fire and artillery shelling, they could also be extremely dangerous places.

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Which of the following is an evacuation hazard?

In addition, a wide variety of emergencies, both man-made and natural, may require a workplace to be evacuated. These emergencies may include explosions, earthquakes, hurricanes, tornadoes, hazardous/toxic material releases, radiological and biological accidents, civil disturbances and workplace violence.

What are the three main protection methods against cave ins quizlet?

The greatest risk in an excavation is a cave-in. 2. Employees can be protected through sloping, shielding, and shoring the excavation.

What are some common causes of cave ins quizlet?

Primary causes of a cave-in include:

  • Vibration.
  • Weight.
  • Noise.
  • Water.

What is meant by shoring?

Shoring, form of prop or support, usually temporary, that is used during the repair or original construction of buildings and in excavations. Temporary support may be required, for example, to relieve the load on a masonry wall while it is repaired or reinforced.

At what depth is an excavation considered a confined space?

In general practice, all trench excavations over four feet in depth should be considered confined spaces until a competent person has ruled out all of the potential hazards associated with it.

What should you do if a cave in occurs?

Shielding involves using trench boxes also known as trench shields or other supports to protect workers inside a trench from collapsing soil if a cave-in occurs. The competent person should pick a trench box that is right for the soil type and all other site conditions.

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