1, the hole body is straight, the entrance and exit, the hole body and the groove are connected smoothly, and there is no water-resisting layer. Deduct 1~3 points if it does not meet the requirements.
2. Hat stones, straight walls or splayed walls should be straight, match the slope and line shape of the route, and have edges and corners. Deduct 1~3 points if it does not meet the requirements.
3. The road surface at the culvert is smooth, and there is no vehicle bump. Deduct 2~4 points if it does not meet the requirements.
4, exposed concrete surface level off, the color is consistent. Deduct 1~3 points if it does not meet the requirements.
Second, the culvert introduction:
Culvert refers to a drainage tunnel (water passage) built under the road surface in order to make the road pass through the canal smoothly and not hinder the traffic. With this structure, water can flow under the road surface. It is used to flood across natural valleys and depressions, or to cross large and small roads as an interchange passage for people, livestock and vehicles, or as a canal to irrigate farmland. Culvert is mainly composed of tunnel body, foundation, end and Hebei wall. Culverts are composed of brick, stone, concrete and reinforced concrete according to the principle of connector. Generally, the aperture is small, and the shapes are tubular, box and arch.