To protect workers from the collapse of an excavation wall in an unshored excavation, install a(n) _____.

To protect workers from the collapse of an excavation wall in an unshored excavation, install a(n) _____.

• A. Sloping
• B. Bracing
• C. Shoring system
• D. Shoring box

Answer: (D)

When workers could be buried by a wall collapse, a protective system must be placed in the trench. A shoring box, also called a trench shield, is a rigid, preassembled unit that goes inside the excavation to hold the sides and keep soil from flowing in on the workers. It provides immediate, physical protection in an unshored trench by creating a barrier against cave-ins. Sloping reduces risk by cutting back the walls but relies on soil conditions and isn’t a ready-made protective device placed in the trench. A bracing setup is part of a shoring system rather than a standalone shield, and a shoring system is the broader approach that uses supports to hold the walls. Therefore, the most direct choice to protect workers in an unshored excavation is a shoring box.

When workers could be buried by a wall collapse, a protective system must be placed in the trench. A shoring box, also called a trench shield, is a rigid, preassembled unit that goes inside the excavation to hold the sides and keep soil from flowing in on the workers. It provides immediate, physical protection in an unshored trench by creating a barrier against cave-ins. Sloping reduces risk by cutting back the walls but relies on soil conditions and isn’t a ready-made protective device placed in the trench. A bracing setup is part of a shoring system rather than a standalone shield, and a shoring system is the broader approach that uses supports to hold the walls. Therefore, the most direct choice to protect workers in an unshored excavation is a shoring box.