| 摘要 |
PURPOSE:To simply match a frame receiver and a steel cover with the slope of a road by a method in which a regulating ring is made up of a lower ring and an upper ring, and the lower ring and the upper ring are inclined relatively to each other. CONSTITUTION:A slant wall 2 is stacked up on a body 1 to form the torso of a manhole, a regulating ring 3 and a frame receiver 4 are stacked up on the slant wall 2, and a steel cover 5 is detachably attached to the frame receiver 4. The regulating ring 3 consists of a lower ring 3a and an upper ring 3b both of which are slightly inclined relatively to each other. By relatively turning the rings 3a and 3b, the contact positions of the rings 3a and 3b are varied, the frame receiver 4 and the steel cover 5 stacked on the upper ring 3b are inclined, and therefore, the frame receiver 4 and the steel cover 5 can be simply matched with each other with respect to the road surface 6. |
