The Double Acting Manhole Brace system incorporates a hydraulic system of adjustment which is designed to extend or retract the frames under conditions of no or low loading: e.g. as when first installed or as they become redundant after backfilling the excavation. Once they are sustaining significant ground loads, hydraulic extension or retraction of the frames is inadvisable this allows a safe working environment for manhole inspection work or new build projects. Hydraulic Manhole Brace is used with an installation kit when the soil conditions do not allow for a Manhole Box to be used, or, if cross services are involved in the scheme.