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The foundation bearing capacity of the cement manhole is insufficient. The dynamic load from the road surface is transmitted to the cement manhole body through the manhole cover, and then vertically acts on the foundation. This means that the vehicle loads on the cement manhole on the road surface act on the foundation of the cement manhole. Therefore, the foundation bearing capacity of the cement manhole must reach a certain strength; otherwise, under the long-term dynamic load at the top, the foundation soil will be compacted and sink, causing the cement manhole to sink as a whole and develop depressions. The construction technique for ensuring the levelness of the road surface is a crucial link in the quality control of cement manholes, and the quality of construction directly affects the performance of the cement manhole.

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