What is the purpose of a Power Installed Screw Anchor (PISA)?

The purpose of a Power Installed Screw Anchor (PISA) is to provide a secure foundation for poles or structures. These anchors are designed to be installed into the ground using power equipment, which allows them to achieve a deep and stable positioning. This is particularly important when supporting structures such as utility poles, which need to withstand various environmental stresses like wind, ice, or seismic activity. The design of PISA ensures that the load is distributed properly, preventing movement and maintaining the stability of the structure it supports.

This makes it a crucial component in construction and utility works where reliable anchoring is necessary for safety and longevity. The other options do not accurately reflect the function of a PISA: stabilizing a trailer involves different equipment, digging speed is unrelated to anchoring, and lifting heavy loads pertains to hoists or cranes rather than anchoring systems.