How many braces must be used when shoring trenches?

When shoring trenches, the use of braces is essential for stability and safety. The correct number of braces typically recommended is two. This ensures that the trench is adequately supported on opposing sides, preventing the walls from collapsing during excavation work.

Bracing with two supports allows for a secure structure while maintaining enough space for workers to operate safely within the trench. It helps distribute loads evenly and minimizes the risk of shifting earth affecting the integrity of the trench.

While using one brace might provide some level of support, it does not adequately stabilize against lateral earth pressures, which could lead to a hazardous situation. Similarly, three or four braces would be excessive for most standard trench widths, potentially complicating operations and increasing material costs without significantly enhancing safety. Therefore, utilizing two braces strikes a balance between safety and efficiency in trench shoring.