Cast iron manhole covers of brick masonry, should be in accordance with the design institute covers the size to determine its diameter or length * width, radius (such as the construction of the best samples), can also be the corresponding reference standards. Puzzle wells must pay attention to the wellhead with inner wells grate covers the inner diameter of the line, installed covers should be flat and pavement. 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.
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.
In order to maintain the cover of the aesthetic appearance of the 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 water contamination of mortar cover the surface damage, surface pattern, handwriting, can also complete the construction of day when the water will clean the surface of the manhole cover。
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