OSHA recognizes three methods to protect workers from collapsing excavations. They are: Sloping, Shoring systems, Shielding.
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.
How can you prevent an excavation from collapsing?
To prevent trench collapse due to the extra weight:
- Move extra excavation materials at least 2 feet away from the trench.
- If there isn’t room, remove the materials from the site.
- Remove personnel from the edge of the trench who are not working on it.
What are three trench protective systems?
OSHA identifies three basic types of protective systems: shielding (devices designed to protect workers in the event of a collapse, such as trench boxes); shoring (bracing designed to prevent collapse, such as hydraulic shoring or slide-rail systems); and sloping or benching trench walls away from the trench bottom at …
How do we protect workers from cave-ins in excavations?
Shoring. This involves using support systems such as hydraulic cylinders to create a barrier between the workers and the trench walls. Shielding. This method uses systems such as trench boxes (use plates used to brace the sides of the trench) to protect workers from cave-ins.
What are the standard methods of cave in protection?
There are two basic methods of protecting workers against cave-ins:
- Temporary protective structures (e.g., shoring, trench boxes, pre-fabricated systems, hydraulic systems, engineering systems, etc.)
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 is the most common cause of a trench collapse?
The results of OSHA’s 2003 investigation are still useful in understanding why trench fatalities occur and how they can be avoided. The main reason trenches collapse is that they are not properly protected. Protective systems were properly employed in only 24 percent of the trenches.
What to do if a trench collapses?
Keep everyone who is not directly involved in the rescue/recovery at least 100 feet from the trench or excavation. Shut down all equipment, except pumps that are being used to remove water in the immediate vicinity of the cave-in. Stop or reroute traffic that might create vibrations and cause a secondary cave-in.
What is shoring in excavation?
Shoring is the provision of a support system for trench faces used to prevent movement of soil, underground utilities, roadways, and foundations. Shoring or shielding is used when the location or depth of the cut makes sloping back to the maximum allowable slope impractical.
At what depth does a trench require protection from collapse?
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.
How deep can a trench be without shoring?
How Deep Can a Trench Be Without Shoring? Trenches with a depth of 5 feet (1.5 meters) or greater need a protective system unless the entire excavation is in stable rock. If there is anything less than 5 feet, it is up to a competent person’s discretion to determine if there is a need for a protective system.
At what depth do the most accidents occur in trenches?
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Some common excavation works associated with trench-related accidents involve sewer, water, communication, and power line constructions. OSHA data reveal that most trench-related accidents occur below 10 feet.
Which of the following is a way to protect yourself when working around excavations?
Which of the following is a way to protect yourself when working around excavations? Slope or bench the sides of the excavation and support the sides of the excavation. Have a competent person identify that the work site is hazardous; no employees can declare an excavation unsafe.
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 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.