Hydraulic shoring is a trench-support system that uses hydraulic cylinders and vertical rails to apply controlled pressure against opposing excavation walls. It is commonly used by utility contractors, municipalities, public works departments, and underground construction crews to provide trench-wall support while maintaining an open working area inside the excavation.

A typical vertical hydraulic shore consists of two aluminium rails connected by one or more hydraulic cylinders. The shore is positioned between opposing excavation walls. Hydraulic pressure extends the cylinders, pushing the rails firmly against the soil. Multiple shores are installed along the excavation at the spacing required by the manufacturer's current tabulated data. Together, the individual shores form a complete trench-support system.

Hydraulic shoring supports the trench walls and actively applies lateral force directly to the soil, stabilizing the excavation walls. A trench box, by contrast, is a protective structure positioned inside an excavation to create a shielded working area for personnel. It does not prevent the walls from collapsing; instead, it protects workers inside the box from cave-in forces.

One of the primary advantages of vertical hydraulic shoring is the amount of access it can provide inside the excavation. The system offers several operational benefits: open trench access to pipe, fittings, valves, and utility connections without continuous shield panels, and lighter aluminium rails that are easier to handle and transport than steel equivalents.

Hydraulic shoring is particularly suited to situations where workers need full access to trench walls. Conversely, trench boxes may be preferable in unstable soil conditions where workers require maximum protection from potential cave-in forces.

Proper installation of hydraulic shoring requires adherence to the manufacturer's tabulated data, which specifies the maximum allowable spacing between individual shores based on trench depth, soil type, and shore capacity. A competent person must be clearly identified for all excavations. Before beginning excavation, all employees working in the trench must receive initial training. Establishing the locations of underground and overhead utilities and services is a mandatory first step to prevent accidental strikes and service disruption.