What process involves repeatedly pushing a pressurized water pipe into loose fill at intervals along the excavation?

The process that involves repeatedly pushing a pressurized water pipe into loose fill at intervals along the excavation is jetting. This method uses high-pressure water to create an effective way of installing utility pipes or conduits by displacing soil and allowing for easier penetration into the ground. In jetting, water is directed through a pipe which helps to wash away the soil around the pipe, making it feasible to push larger diameters into the ground without causing significant disturbance to the surrounding earth.

This technique is particularly useful in loose fill areas, where traditional methods, such as boring or trenching, may lag in efficiency or cause excessive soil disturbance. Jetting allows for a faster and more effective installation of piping systems, which is essential in water distribution infrastructure.