1. Environmental difference
Environmentally speaking, viaducts will have a certain impact on the land and urban landscape on both sides, and are prone to noise; while tunnels will have little interference with ground traffic. .
2. Different costs
The cost of viaducts is lower than that of tunnels. The construction and later operating costs of tunnels are far more than those of viaducts. At the same time, the safety of tunnels is not as great as that of viaducts. Tunnels are in rescue , traffic organization and other aspects are relatively difficult than viaducts.
3. Different definitions
The Yangtze River Bridge strictly refers to the bridges on the Yangtze River section below the Minjiang Estuary in Yibin, but it usually refers to all bridges on the main stream of the Yangtze River. After the Yangtze River Tunnel is opened to traffic, it is expected to divert about 20% of the cross-river traffic in the central urban area of ??Wuhan, which will alleviate the traffic pressure on the First and Second Yangtze River Bridges.
4. Different levels of difficulty
The bridge repair mainly uses high-tech and high-precision pouring engineering, using high cranes to accurately and seamlessly splice the bridge deck with good plasticity. However, the calculation of the distance between the two sides of the bridge and the selection of bridge deck materials are all highly professional issues, and there cannot be any errors.
There is a lot of unpredictability in digging mountains and tunnels, and most of the time we don’t know the specific conditions inside the mountains