The circular tube culvert of culvert tunnel consists of two parts: the tunnel body and the entrance.
The tunnel body is the main body of the water passage, which is mainly composed of pipe body, foundation and joint. Holes are the connecting parts of the cave body, subgrade and water flow, and there are mainly two types of holes [6-7].
The pipe body of circular pipe culvert usually adopts reinforced concrete, and the pipe diameters are generally 0.75m, 1m, 1.25m, 1.5m, 2m, etc. The pipe diameter is selected according to the drainage requirements, and prefabricated installation is mostly adopted, and the prefabricated length is generally 2m. When the pipe diameter is 0.5m or 0.75 m, single-layer steel bars shall be used, and when the aperture is above 1 m and 1 m, double-layer steel bars shall be used. The pipe wall thickness is 0.5 m, the pipe diameter is not less than 6 cm, the pipe diameter is not less than 8 cm, and the pipe diameter of 1m is not less than1.
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