What are cross braces used for in shoring systems?

Cross braces are an essential component in shoring systems, specifically designed to stabilize the sides of an excavation. When excavations occur, the walls can become unstable due to soil erosion or collapse, particularly in deeper digs. By installing cross braces, forces are distributed more evenly and prevent lateral movement of the soil, thus ensuring the safety of workers and equipment within the excavation.

The other options involve different functions: vertical supports are used to keep the structure above safe, adding weight to machinery is unrelated to shoring systems, and marking boundaries pertains to site management rather than stabilization. Understanding the role of cross braces helps in maintaining safe excavation practices.