Which system uses hydraulic jacks, metal bracing, timber, and trench boxes to support the trench sides?

• A. Pipe Bedding
• B. Trench Load
• C. Shoring
• D. Manhole Safety

Answer: (C)

Shoring is the method used to support trench walls and prevent cave-ins during excavation. The setup described—hydraulic jacks, metal bracing, timber, and trench boxes (shields)—are classic components of a shoring system. The hydraulic jacks apply outward pressure to hold the soil back, while timber or metal bracing provides the internal framework, and trench boxes are installed to physically contain and shield the sides as workers operate inside. This combination is specifically designed to maintain trench stability under load and protect workers from collapses. The other options relate to different trench concerns: pipe bedding is about providing a stable bottom for pipes, manhole safety covers protections around manholes rather than side support, and trench load isn’t a standard term for a system that supports trench walls.