What is an underwater culvert?

It is a drainage tunnel under the subgrade, which usually consists of two parts: the tunnel body and the portal building. Its function is the same as that of a bridge, but its aperture is generally small, and its shape is tubular, box, arch and so on. In addition, the culvert is also a cave-type water conservancy facility with a gate to adjust the water volume. Cement culverts use concrete pipes or components, so the service life of cement is relatively short and the pressure is relatively small. Steel corrugated pipe culverts produced by Qijia in Hengshui are generally as small as 250mm and as large as they can be punched. Under pressure, it is not easy to corrode, its price is relatively low and its service life is quite long.

The function of culvert is to quickly remove surface water along the highway and ensure the safety of subgrade. As one of the important parts of highway engineering, culvert occupies a large proportion in highway engineering, which is an important part of highway engineering, mainly manifested in the number of projects and project cost. According to relevant data, the number of culvert works accounts for about 60%-70% of the total number of bridges and culverts, and there are about 1 ~ 3 in plain areas every kilometer; On average, there are about 4 ~ 6 heavy hills per kilometer. The cost of culvert works accounts for about 40% of the total amount of bridges and culverts.