| 摘要 |
The invention provides a hydraulic lifting apparatus that permits convenient and efficient removal and replacement of a rectangular manhole cover from an access conduit. The invention further allows personnel to perform such removal and replacement from a safe distance. In one embodiment, the hydraulic lifting apparatus comprises a lifting member coupled to a hydraulic actuation device that is movably connected to lifting hooks to permit interface with and release from the lifting blocks of the rectangular manhole cover. |
