The utility model discloses a three manhole cover, manhole cover, manhole cover (1) comprises a tray (6) and locking device; wherein, the locking device is mainly composed of a fixed installation of the manhole cover (1) a buckle pin (3) and is arranged in the cover tray (6) on the button (7) is formed; the pin (3) by the end of the thick part other than the bolt; the buttonhole (7) in the shape of a big end and a small end, a buckle pin (3) is matched with the formation of padlock. The three currently used relative manhole cover manhole cover, not only has the anti rain sewer anti surge Dingfan function, but also has strong anti load heavy truck rolling damage function, it also has good anti-theft function, simple structure and low manufacturing cost.
【技术实现步骤摘要】
【技术保护点】
一种三防窨井盖,包括井盖(1)、井盖托盘(6)和扣锁装置;其特征在于:所述的扣锁装置主要由固定安装在井盖(1)阴面的扣销(3)和设置在井盖托盘(6)上的扣眼(7)形成;所述的扣销(3)采用其中一端端头比其它部分粗大的螺栓;所述扣眼(7)的形状呈一端大一端小,与扣销(3)相适配形成扣锁。
【技术特征摘要】
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