| 摘要 |
PURPOSE: A manhole for enabling easy height adjustment and installation is provided to reduce the time and labor to install a manhole since there are no processes of manufacturing a mold, placing and curing concrete, and welding each component. CONSTITUTION: A manhole for enabling easy height adjustment and installation comprises a body(10), an auxiliary unit(20), and a water-tight ring. The body comprise reinforcing ribs(12) and a fitting portion(11). The reinforcing ribs are formed at regular intervals along the outer circumferential surface in a length direction to reinforce strength. The auxiliary unit adjusts the height of a manhole according to the depth of field. The auxiliary unit comprises a reinforcing rib(21). The reinforcing rib has the same diameter to the body. The water-tightly ring improves the water-tightness between the body and the auxiliary unit. |
