What are the hazards of working in trenches and excavations?

When working in trenches and excavations the most common and dangerous hazard is?

Trenching and excavation work presents serious hazards to all workers involved. Cave-ins pose the greatest risk and are more likely than some other excavation-related incidents to result in worker fatalities. One cubic yard of soil can weigh as much as a car.

What are the hazards in excavation jobs?

Excavation Hazards:

  • Damage to underground facilities.
  • Personal, vehicle, equipment and materials falling inside excavation.
  • Cave-in, Soil collapse due to loose soil and heavy equipment moment.
  • Presence of toxic and flammable gases.
  • Injuries due to employees working very close to each other.

Which hazards should be prevented for working in or near excavations?

Excavated spoil, plant or materials should not be stored close to the sides of excavations as loose material can fall in. The extra loading can make the sides of the excavation more likely to collapse. Prevent people from falling into excavations by substantial barriers around the edges.

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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.

What are the safety precautions in excavation work?

03. Safety Precaution while Excavation Work:

  • Prepare firm and broad approach road. …
  • The nail should not be lying around, after the completion of layout work.
  • Barricade the site to restrict the entry of animal and the unauthorised person on site.
  • Ensure that workers are wearing personal protective equipment.


How can excavation hazards be prevented?

Provide protection by:

  1. Set spoils and equipment at least 2 feet back from the excavation.
  2. 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 in scaffolding?

Building scaffolding for work projects can present numerous serious hazards to employees. According to OSHA, injuries related to scaffolds include falls, tip-overs, being struck by falling equipment, and coming into contact with energized power lines.

What are the hazards in confined space?

The hazards associated confined spaces include:

  • Toxic Atmosphere. A toxic atmosphere may cause various acute effects, including impairment of judgement, unconsciousness and death. …
  • Oxygen Deficiency. …
  • Oxygen Enrichment. …
  • Flammable or Explosive Atmospheres. …
  • Flowing Liquid or Free Flowing Solids. …
  • Excessive Heat.

How are excavations prepared?

Make sure the equipment and precautions needed (trench sheets, props, baulks etc) are available on site before work starts. Battering the excavation sides – Battering the excavation sides to a safe angle of repose may also make the excavation safer.

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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.


What is the greatest danger associated with excavations?

Explanation: Cave-ins pose the greatest risk and are much more likely than other excavationrelated accidents to result in worker fatalities. Other potential hazards include falls, falling loads, hazardous atmospheres, and incidents involving mobile equipment.

What are the standard methods of cave in protection?

There are two basic methods of protecting workers against cave-ins:

  • Sloping.
  • Temporary protective structures (e.g., shoring, trench boxes, pre-fabricated systems, hydraulic systems, engineering systems, etc.)


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. 3.

Special equipment and operation