Through consulting and studying interchange bridges at home and abroad, Huaihai Road and Canal Bridge are carefully investigated, analyzed and compared according to the current layout, topography and road intersection, and suitable interchange bridges are selected. The feasibility of the project is demonstrated, and the traffic volume in the future 20 years is considered. After comparison, the best bridge type is determined. The design can solve the traffic jam, traffic delay and eliminate the contradiction at the intersection, so as to significantly improve the traffic speed, increase the capacity, ensure traffic safety, improve the traffic environment and improve social and economic benefits. Therefore, the design and construction of bridges are of great significance to the traffic development in Huai 'an.
1.2 Development of Spanning Interchange
1.2. 1 agricultural products exchange
(1) cross-plane features
A plane crossing road is the intersection or connection of two or more roads on the same plane, and its characteristics are mainly reflected in the following aspects:
There is a danger point here, the traffic complexity of the public.
(2) the method of improving cross-plane.
1) In terms of time, all traffic streamlines at intersections are separated in time, that is, through alarm or control signals.
2) Implement traffic organization: set up various traffic facilities or passing lines at intersections, install traffic signs and other traffic guidance and traffic organization measures, so that the traffic flow can go its own way on the plane lines and implement separation.
3) Building an interchange: By building an overpass structure, the main traffic flow at the intersection is separated from the basic dividing line traffic flow in space, and at the same time, the lines between the main traffic flows that interfere with each other are connected by building a ramp to realize the conversion between traffic flows.
1.2.2 agricultural products exchange
The emergence and development of interchange is always associated with motor vehicle traffic and urban development. With urbanization, development and delivery
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The rapid development of car ownership brings the rapid growth of traffic flow, and the original road capacity can no longer meet the growing traffic demand. At the same time, the phenomenon of lane contention among pedestrians, non-motor vehicles and motor vehicles is becoming more and more serious, and the traffic organization measures such as signal control and plane processing are far from fundamentally solving the problems existing in urban traffic. In this context, interchanges first came into being in cities, and quickly became a widely used medicine to solve the problem of urban traffic congestion.
1.2.3 development of interchange I
With the emergence of high-grade highways, the development of trunk highways and the improvement of vehicle speed, it is urgent to improve road capacity; At the same time, it is of special significance to ensure road safety, which provides a prerequisite for the rapid development of interchanges.
1925 expressway interchange, which appeared in Germany. After that, the fastest and most extensive development of interchange is the United States. Before and after World War II, Germany also built a large number of high-grade interchanges. In addition, with the rapid development of economy and the massive construction of highway traffic, many functional and economical interchanges have been built in Japan after the war, and various interchange designs have provided a lot of experience, which can achieve results in design standards and specifications. Up to now, many overpasses have been built in various countries, and gradually formed different styles of characteristics.
With the construction and development of urban roads and expressways in China, the construction of interchange is in the ascendant. Many interchanges have been built in cities and high-grade highways. According to incomplete statistics, more than 100 interchanges have been built in Beijing and banqiao area alone in China. Some interchanges are special and innovative in terms of scale, shape, design and construction standards and greening and beautification.