The use of the wellhead depends on the size of the wellhead。 If it is not necessary to install a square well cover which is far larger than the wellhead, the use and practical value of the material will not be more effective, not only to use a circular hole cover directly, not only to save the material of the well cover, but also to ensure the safety of the wellhead。 In the countryside and cable well, the square is generally used, so that we can better prevent the entry of rainwater and other liquids。
Generally, it is divided into circular and square. In the road administration of the city, it is usually round, because the circular hole cover is not easy to tilt, and it can better protect the safety of pedestrians and vehicles. The circle is used mainly to take into account that the round hole cover is the same as each of the diameter of the center, so that if the covered vehicle is rolled up, the diameter of the shaft will be slightly wider than the following, and the cover will not fall into the wellhead.
If a square is used, because the square diagonal is obviously longer than the length of each side, it is easy to fall into the well along the diagonal direction of the wellhead, causing a safety hazard. If the wellhead is circular or obviously smaller than the manhole cover, the square manhole cover will not fall into the well.
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