| 摘要 |
PURPOSE: A system for a manhole cover with a level adjustment function is provided to easily lift a manhole by operating a screw jack with support bolts without digging around the manhole and to firmly set a manhole cover to a road. CONSTITUTION: A system for a manhole cover with a level adjustment function comprises a plurality of through holes(100b), a separation prevention hole(100c), a plurality of support bolt through holes(100d), and a plurality of rotation prevention key grooves(100f). A plurality of through holes is formed in the upper end of a manhole seat housing(100) to combine with a separation prevention projection on a support bolt. The separation prevention hole is formed at one side of the through hole. A plurality of support bolt through holes is formed in the lower end of the manhole seat housing to pass a plurality of support bolts. A plurality of rotation prevention key grooves is linearly formed at one side of an external wall. |
