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    • 9. 发明授权
    • Manhole cover and method for manufacturing same
    • 人孔盖及其制造方法
    • US08979421B2
    • 2015-03-17
    • US13383528
    • 2010-07-13
    • Jung Sik Jang
    • Jung Sik Jang
    • E02D29/14B28B23/02B29C67/24
    • E02D29/14B28B23/02B29C67/243
    • A manhole cover maintains a strength and weight the same as those of conventional manhole covers made of cast iron, eliminates the risk of theft, and achieves improved corrosion resistance and sealing properties. The manhole cover comprises: a base unit made of composite materials having compositions containing 12 to 18 wt % of glass fiber, 17 to 23 wt % of a polyester resin, with the remainder being calcium carbonate (CaCO3), wherein the base unit is mounted on the manhole such that an upper portion of the base unit is exposed aboveground; and a metal reinforcement unit which is uniformly distributed within the base unit to reinforce the base unit and increase weight and strength of the base unit.
    • 人孔盖的强度和重量与常规的铸铁井盖相同,消除了被盗的风险,并提高了耐腐蚀性和密封性能。 井盖包括:由具有12-18重量%玻璃纤维,17-23重量%聚酯树脂的组合物的复合材料制成的基座单元,其余为碳酸钙(CaCO 3),其中基座单元安装 在所述人孔上,使得所述基座单元的上部在地面上露出; 以及金属加固单元,其均匀地分布在基座单元内以加强基座单元并增加基座单元的重量和强度。