| 摘要 |
A double manhole is provided to easily control the height by reducing the part rubbed with a cover although a cover and the double manhole are closely contacted with the high temperature. A double manhole(2) is composed of a main body(3), a plurality of fixing pin holes(6) formed in zigzag, a guide slot(7) symmetrically formed outside the main body, a reinforcement part(9) formed in the inner wall of the main body, and a locking protrusion(10) formed on the top of the main body. The double manhole is formed to be separated from the manhole main body. A plurality of fixing pin holes(6-1) in which a fixing pin(5) is inserted is formed in the manhole main body. A guide pin(8) is symmetrically formed in the manhole main body. |
