| 摘要 |
A utility portal frame (11) including a base plate (13) having an aperture to provide a portal entrance, and at least one wall (14) dependent from the base plate, the wall extending substantially orthogonally relative to the base plate from an outer peripheral edge of the base plate. The frame includes a means adapted to facilitate raising of the frame from a first position to a second position substantially without disturbance to material surrounding the at least one wall. The means may be a jacking point (23) provided in the base plate.
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