What is the primary function of shield systems in excavations?

The primary function of shield systems in excavations is to prevent lateral movement of the shield. These systems are designed to protect workers and maintain stability in the excavation by providing a barrier against soil collapse. The shields help to maintain the integrity of the surrounding earth, effectively minimizing the risk of cave-ins and ensuring a safer working environment.

By preventing lateral movement, shield systems secure the sides of the excavation, allowing operators to work confidently within the protected area. While the other aspects of excavation are important, such as supporting vertical loads or enhancing visibility, the core purpose of a shield system is to mitigate risks associated with soil movement and maintain stability during the digging process. Hence, the focus is on ensuring safety through lateral support.