How strong is the infrastructure in China? How did it build a bridge in 43 hours?

This is a question about the time taken by the British professor to rebuild and replace the Sanyuan Bridge in China and Beijing. The whole process of beam replacement and healing took only 43 hours, and the key point was "repair" rather than repair (construction) in another sense. At that time, there was a lot of preliminary work in this restoration process. Let's talk about the operation process of replacement in detail.

First, establish a maintenance plan. The reason for repairing the bridge is that the beam built in 1984, which can only bear 2,000 tons, is no longer suitable and needs to be replaced with a beam with a load of more than 2,900 tons. And the final plan, is:

1, the upper part is replaced by a steel box girder, which will be stronger;

2, the lower part is directly reinforced with steel plates, which can enhance the stress strength;

3. Replace the indispensable pier with a V-shaped pier.

This scheme can not only improve the bearing capacity of the bridge, solve the problem of overload operation, but also greatly improve the seismic grade.

Then, the steel box girder, steel plate and V-shaped pier are made, and the transportation route is planned.

After finding the customized steel box beams, steel plates and piers produced by Seiko Bridge Factory in advance, we communicated with the transportation department in Beijing, and hundreds of large hoisting machines came out from all over the country to Sanyuan Bridge until they were all in place.

Finally, after each unit arrives at the post, it takes 43 hours to weld and assemble on site.

Thousands of workers were used to repair and assemble the Sanyuan Bridge, all of whom were elites in various industries. There are 24 bridge engineers alone. Welding of large-scale equipment, precise assembly of various large-scale hoisting machinery. Finally, the welded steel plate was strengthened, which finally made the whole beam replacement work only take 43 hours, which shocked the world.

The story of Sanyuanqiao made the world know about the infrastructure in China, and then re-examined the infrastructure projects in China, and also recognized the speed of China.