Shoring requires installing aluminum hydraulic or other types of supports to prevent soil movement and cave-ins.
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 three main protection methods against cave-ins?
- SLOPE or bench trench walls.
- SHORE trench walls with supports, or.
- SHIELD trench walls with trench boxes.
What is cave in what are the methods of protection for cave in?
Takeaway: Use sloping, benching, shoring and shielding to provide cave in protection on an excavation site. There are four ways to protect workers from cave ins on an excavation site: sloping, benching, shoring and shielding.
What are the three methods to protect workers from collapsing excavations?
- Shore the Trench’s Perimeter to Hold Back Potential Cave-ins. ...
- Shield the Workers with Trench Boxes. ...
- Slope the Trench Walls to Reduce Dangerously Steep Walls.
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.
What is the safest way to get into and out of a deep excavation?
Battering the excavation sides – Battering the excavation sides to a safe angle of repose may also make the excavation safer. In granular soils, the angle of slope should be less than the natural angle of repose of the material being excavated . In wet ground a considerably flatter slope will be required.
How do you protect deep excavation?
Those methods are sloping, benching, and shoring or shielding . Sloping: Sloping is a viable option as a protective system. Sloping is often the most cost-effective way to protect employees from potential trenching and excavation hazards.
How can we prevent excavation?
- 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.
How deep can you dig 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 to do if a cave-in occurs?
Call 911 and/or the company’s rescue team , and report the cave-in. If the construction site is difficult to find, designate someone to meet the trained rescuers at a readily identifiable address or landmark, and direct them to the cave-in location.
What was used to protect trenches?
A shoring system is a structure such as a metal hydraulic, mechanical or timber shoring system that supports the sides of an excavation and which is designed to prevent caveins. Shoring or shielding is used when the location or depth of the cut makes sloping back to the maximum allowable slope impractical.
What is a cave-in Hazard?
Types of Excavation Hazards
Cave-ins or collapses are the greatest risks. Other hazards include: ... Excavated Soil or Equipment falling on workers. Moving machinery near the edge of the excavation can cause a collapse. Falling, Slips, Trips.
How can you control water around an excavation?
CONTROL OF GROUND WATER. Dewatering is the process of removing water from an excavation. Dewatering may be accomplished by lowering the groundwater table before the excavation is begun . This method of dewatering is often used for placing pipelines in areas with high groundwater levels.
What is risk of collapse in excavations?
A small fall of earth is capable of causing serious injury and/or death . Main hazards of excavation: Collapses. Excavation sides can be protected by battering the sides to a safe angle, supporting them with shuttering and sheeting, the use of trench boxes or hydraulic support systems. Person Falling into the Excavation.
What is benching in excavation?
“Benching (Benching system)” means a method of protecting employees 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.
