| 摘要 |
A semi-automatic manhole assembly assisted by a hydraulic device consists essentially of a circular frame (1), a cover (2) provided on the top, a hydraulic device (3) and a supporting unit (5) provide therebetween and jointed with both the frame (1) and cover (2) respectively, and a locking mechanism (4) disposed on an opposite end of the hydraulic device (3) and supporting unit (5) for sealing the cover (2) and frame (1) tightly. The supporting unit (5) is partially concealed within a trough (2), disposed at the bottom of the frame (1), and the hydraulic device (3) is prestored with pressure to lift the cover (2) when the locking mechanism (4) is released.
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