| 摘要 |
PURPOSE: A manhole provided with a cover separation preventive coupler is provided to prevent an accident caused by the separation of a manhole, to prevent the noise caused by the shaking of the manhole, and to reduce a budget for maintenance without concerns on the damage of a projected road surface according to road repairing. CONSTITUTION: A manhole provided with a cover separation preventive coupler comprises a circular cover(10) provided with locking grooves(12) having a slope(14) opened outward, a support(20) provided with an opening circumscribing to the cover formed on an upper side, a locking lug(22) corresponding to the locking grooves, and a ledge(24) close to the cover when closing.
|
