How can we protect excavation?
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.
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 are the hazards in 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.
How do you prevent an excavating cave in?
To prevent cave-ins:
- SLOPE or bench trench walls.
- SHORE trench walls with supports, or.
- SHIELD trench walls with trench boxes.
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.
How is excavation done?
Some of the different processes used in excavation include trenching, digging, dredging and site development. Each of these processes requires unique techniques, tools and machinery to get the job done right.
What is benching in excavation?
Benching means a method of protecting workers from cave-ins by excavating the sides of an excavation to form one or a series of horizontal levels or steps, usually with vertical or near vertical surfaces between levels.
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.
What type of soil is most stable?
Solid Rock is the most stable, and Type C soil is the least stable. Soils are typed not only by how cohesive they are, but also by the conditions in which they are found.
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 types of excavation?
Types of Excavation
- Earth excavation is removal of the layer of soil immediately under the topsoil and on top of rock. …
- Muck excavation is removal of material that contains an excessive amount of water and undesirable soil. …
- Unclassified excavation is removal of any combination of topsoil, earth, rock, and muck.
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 can employers prevent cave-ins?
Such precautions can include special Page 17 Trenching and Excavation Safety 1 1 support or shield systems to prevent cave-ins, water removal to control the water level, or the use of a safety harness and lifeline.
How deep can you Excavation without 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 greatest danger associated with excavations?
- The greatest risk in an excavation is a cave-in.
- Employees can be protected through sloping, shielding, and shoring the excavation.
- A competent person is responsible to inspect the excavation.
- Other excavation hazards include water accumulation, oxygen deficiency, toxic fumes, falls, and mobile equipment.