When installing cast iron covers on asphalt pavements, attention shall be paid to avoiding the direct rolling of the well seats by the construction machinery. In the overall casting of the pavement, the holes shall be reserved slightly larger than the well seats, and shall be installed after the asphalt pavement is laid. (all concrete pavement shall be installed after two stones are laid and compacted) to ensure the quality of manhole covers so as to prolong the service life.
The masonry of Shandong ductile iron manhole covers shall be determined according to the size of the manhole cover designed by the Design Institute, and its inner diameter (or length) shall be the best. When laying well, we must pay attention to the inside diameter of the wellhead. It should be in accordance with the inside diameter of the manhole and the grate. The well installed well should be in line with the road surface. Concrete or asphalt well base casting after laying open the lid, should be timely cleaning, avoid mortar or bitumen will be poured into the manhole cover and a seat body, so as not to affect the day after opening.
But as a function of sewage interception is not the pink of perfection, if you reach a certain level in the interception of dirt, will prevent contaminants from entering the pipeline deposition, also greatly reduced the flow capacity, in many plastic products or hard rain Olivier garbage will be sealed, or will lead to water problems are not resolved so for the maintenance of rain Olivier is still very necessary.
In order to keep the appearance of the cover surface, the surface pattern and the writing are clear, when the asphalt pavement construction is applied, the thin iron sheet is covered with the brush cover surface of the well cover or the waste oil, etc。, so as to prevent the asphalt oil from being sprayed on the manhole cover。
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