Interchange information

Bridges built at the intersection of roads and railways to ensure that traffic does not interfere with each other. Widely used in highways and urban roads in busy traffic areas. According to the form of crossing, it is divided into: ① overpass bridge. Cross existing lines. It is also divided into separation and intercommunication. The former only ensures the independent passage of vehicles on and off the line; The latter can make the upper and lower vehicles pass each other, build complex roundabout ramps on the plane and elevation, and occupy a lot of land. To reduce noise, prestressed concrete bridges are often used. ② underpass bridge. Crossing the existing line from underground. It consists of bridge holes, approach roads and ancillary structures. Underground pipelines need to be removed during construction, and the ancillary works are large, which is far less economical than the construction of overpass bridges. In addition, the design should also pay attention to the requirements of clearance, ventilation, lighting, drainage and anti-icing (cold area).

The picture shows Guangzhou urban traffic overpass.