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.
In order to maintain the appearance of ductile cast iron covers Shandong appearance, surface pattern and handwriting clear, the application of thin iron cover on the well cover or waste oil brush cover in asphalt pavement construction, prevent the asphalt oil spray on the well cover; in cement concrete pavement construction, application of plastic cover, to prevent cement the mortar with the surface of the manhole cover, surface damage pattern, also can complete the construction of the handwriting, water will clean the surface of the manhole cover.
The installation of Shandong ductile iron manhole covers in asphalt pavement, we must pay attention to avoid the construction machinery to direct rolling shaft, in the whole road when casting should be reserved, slightly larger than the shaft hole in the asphalt pavement, placed in the end. Ensure the quality of manhole covers so as to prolong the service life.
Cement pavement well base installation, concrete casting thickness of 20CM beam with C25 at the wellhead smooth brick masonry, must maintain a well seat four indeed, overall smooth, not loose, and the width of concrete protective covers casting ring 40CM (if it is a cement road, also can cast width of concrete protective ring, 20CM and by reinforcing the maintenance period) to more than 10 days。
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