Thursday, April 5, 2007
Excavation and trenching are known as the most unsafe construction operations. Excavation is defined as any man-made cut, cavity, land clearing or trench in the earth's surface formed by earth removal. A trench is defined as a narrow alternative excavation, which is deeper than it is wide, and is not wider than 15 feet (4.5 meters).
Dangers involved in Excavation and Trenching
Cave-ins have the maximum risk and are much more probable than other types of excavation associated accidents to result in worker fatalities. Other possible dangers include falls, falling loads, harmful atmospheres, and other incidents concerning mobile equipment. Trench gives way cause dozens of losses and hundreds of harms each year.
Common Excavation and Trenching Rules
Dangers involved in Excavation and Trenching
Cave-ins have the maximum risk and are much more probable than other types of excavation associated accidents to result in worker fatalities. Other possible dangers include falls, falling loads, harmful atmospheres, and other incidents concerning mobile equipment. Trench gives way cause dozens of losses and hundreds of harms each year.
Common Excavation and Trenching Rules
- Heavy equipment tools should be kept away from trench edges.
- Surcharge loads needs to be at least 2 feet from trench edges.
- One should not work under raised loads.
- Test for low oxygen, dangerous fumes and other toxic gases.
- Inspect the trenches that follow a rainstorm.
- You should know the location of underground utilities
Self protection
You should not enter an unprotected trench! Trenches 5 feet (1.5 meters) deep or superior need a protective system unless the excavation is made totally in stable rock. Trenches 20 feet deep or better require, which the protective system be designed by an expert engineer or be based on tabulated data prepared and/ or approved by a registered expert engineer.
Protective Systems
There are various kinds of protective systems available. Sloping comprises cutting back the trench wall at a slant inclined away from the actual excavation. Shoring needs installing aluminum hydraulic or any other kinds of supports to stop soil movement and cave-ins. Shielding defends workers by making use of trench boxes and also other types of supports to stop soil cave-ins. Designing a protective system could surely be compound because you have to think about many factors: soil classification, depth of cut, water soil, changes in the weather or climate condition, surcharge loads (e.g., spoil, other tools to be used in the trench) and other operations in the surrounding area.
posted by Land Clearing
@ 10:37 PM
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