Nowadays, when we talk about China, we not only know that we are a mysterious oriental country, but also know that we are one of the most hospitable countries in the world.
In addition to these two, we have even been dubbed "infrastructure madness".
Even the United States, which claims to be the strongest in the world, has to admit that they are beyond their reach in terms of infrastructure.
It even signed a contract worth 50 billion yuan with China, and this contract involves the San Francisco Bay Bridge in the United States.
This bay bridge was once the longest sea-crossing bridge in the United States and the world.
In 1936, the bridge was built.
At that time, there was a gold rush in the United States, and the United States government spent nearly $100 million to connect the San Francisco Bay to the outside world.
Since its inception, the bridge has held numerous bridge records and become the pride of the United States.
For the United States, the Forbidden City is as important to China as it is to China.
On the day the bridge was completed, then President Herbert Hoover was present to cut the ribbon on the bridge, and the popes of Europe also came to congratulate the bridge after its completion.
From this it can be seen that the bridge represents not only the United States, but also all Western countries.
However, this "giant" who was held in the palm of his hand has been scarred for more than 70 years.
The worst blow came in October 1989, when a massive earthquake struck San Francisco, causing major damage to the city, including the east bridge portion of the Bay Bridge.
Due to the collapse of the bridge deck, the east bridge was barely restored after more than a month of repair, and the west bridge was also reinforced.
But since then, the bridge has fallen under a spell and has been damaged repeatedly.
Seeing that nearly 300,000 cars are driving here every day on the bridge, it would be terrible if something happened one day.
So after some consideration, the government finally decided to carry out a comprehensive repair of the bridge to prevent future problems.
At first, the Americans wanted the Japanese to build it for them.
However, Japan disappointed them, although the earthquake prevention did a good job, but did not have the experience of building bridges across the sea, and in the end they could only watch Chinese companies eat this piece of fat.
The bridge is very long, and the whole bridge does not completely float on the water, but needs to be built to connect the deck to the undersea tunnel.
You can imagine how difficult it was when it was first built.
The bridge not only spans the ocean, but also spans the Hayward Fault Line and the San Andres Plate, which are frequently struck by earthquakes.
So the U.S. government put forward a condition, that is, to ensure that the bridge can remain intact in the event of a major earthquake and can continue to be used.
By July 2011, China's Zhenhua Industry had to not only transport the building materials to the designated location, but also assemble the individual components.
If the contract period is exceeded by one day, it is $350,000 in liquidated damages, which is very expensive.
In terms of manufacturing process, there are many difficulties.
At the same time, in the construction process, how to avoid deformation and cracking after welding is also a difficult point in construction.
Fortunately, Zhenhua Industry is very strong, as a big infrastructure country, more than 1,000 welding workers of Zhenhua Group have passed the technical certification of the United States.
On September 2, 2013, the San Francisco Bay Bridge, which was completely restored and refurbished, was reopened on a sunny day.
Behind it, there is a statue of the Lady of Liberty that shines brightly.
The perfect answer sheet handed in by Zhenhua Industry is also an important milestone in the history of our country's infrastructure.