| 摘要 |
PURPOSE: A form for finishing a manhole cover is provided to prevent the overflowing of a finishing material placed in excavated ground around a manhole cover. CONSTITUTION: A form for finishing a manhole cover comprises an expansion form plate(10), link members(22,24), and an extension member. The expansion form with free ends is arranged under a manhole cover and its diameter is extended to close excavated ground around the manhole cover. The link members are connected to the expansion form plate and coupled to cross each other around a hinge(26). The extension member is connected to the link members and opens or closes the link members to extend or reduce the diameter of the expansion form plate. |
