When is it necessary to use shields during excavation work?

Using shields during excavation work is necessary when the excavations cannot be benched or sloped. This is because benches and slopes are methods employed to provide stability to the walls of an excavation. If these methods are not feasible due to space constraints, soil type, or other site-specific conditions, the use of protective systems such as trench shields or boxes becomes essential. These shields help to prevent cave-ins, which are one of the primary hazards associated with excavation work.

In situations where it is not safe to use sloping or benching techniques, shields serve as a crucial line of defense for workers in the excavation area by providing both physical protection from collapsing walls and clear guidelines for safe operation. Ensuring the safety of workers is paramount, and employing shields is a key part of the safety measures when alternative methods cannot be applied.