| 摘要 |
A manhole cover for water and sewage, electricity and communication having an inspection door is provided to let a worker or a manager inspect the inside of a manhole easily by opening an inspection door only without opening a heavy manhole cover. A manhole cover for water and sewage, electricity and communication having an inspection door contains: a manhole frame(1) buried under the ground or a road and coupled with a manhole cover, and provided with reinforcing ribs(14) formed on the edge of a support panel(13) having many connecting holes(131) at regular intervals to support a seating part(11), which has many primary guide projections(12) to lock up a manhole cover; a manhole cover(2) provided with an end projection(22) having the smaller diameter than a manhole cover body(21), secondary guide projections inclined to press-fit to the lower part of the primary guide projections, many nonskid projection(23) formed on the manhole cover body to prevent traveling vehicles or pedestrians from sliding on the manhole cover and primary ring grooves(24,24') having primary hanging pieces(241,241'); and an inspection door(33) coupled to an inspection hole(31) formed on the manhole cover body to make a worker or a manager check the inside of a manhole without opening a heavy manhole cover and provided with many third guide projections(32) and fourth guide projections(334) to prevent the inspection door from being separated from the inspection hole easily and secondary ring grooves(332) having a secondary hanging piece(331) to open or close the inspection door. |
