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已经竣工交付使用的居民小区内,经常发生井盖翻转伤人的事故。这种不过汽车的井盖,一般比较薄,重量轻,井圈槽浅,遇有铸造时出现的质量问题,再加上井盖与井圈之间有砂子等,当行人踩上井盖一侧时,井盖容易滑动,在滑动过程中同时产生翻转伤人。井盖翻转伤人有血的教训,如1990年5月北京市六里桥小区发生一起水表井盖翻转
In the residential communities that have already been completed and delivered for use, accidents involving flipping and injuring people have frequently occurred. This kind of car covers, however, are generally thin, light-weighted, with shallow wells and grooves, and in case of casting quality problems, as well as sand between the well cover and the well ring, when a pedestrian steps on the side of the well cover, The manhole cover is easy to slide, causing an overturning wound during the sliding process. The manhole cover flipped wounds and blood lessons, such as a water meter cover flip in the Liuliqiao district of Beijing in May 1990.