In which situation is trench shoring required during drainage excavation?

Trench shoring is required in situations where the trench is deeper than 1.5 meters. This requirement is based on safety regulations designed to protect workers from potential hazards associated with deep excavations, such as cave-ins. When a trench exceeds this depth, the risk of soil collapse increases significantly due to the weight and pressure of the surrounding materials.

Using trench shoring in deeper excavations creates a safe working environment by providing structural support to the walls of the trench, preventing collapse, and ensuring that workers can operate without the imminent danger of being buried. This regulation is grounded in the understanding that the risk increases with the depth due to factors such as soil type, moisture content, and the angle of repose.

In situations where trenches are shallower, such as less than 1 meter deep, the need for shoring is generally not mandated, as the likelihood of a cave-in is considerably reduced. Stable soil types also play a role in determining whether shoring is necessary; however, the overriding factor in this scenario is the depth of the trench. Therefore, the requirement for trench shoring is clearly linked to maintaining safety in deeper excavations.