Shanghai is prosperous

Chapter 332 Shanghai Yangtze River Tunnel Bridge
The car left Wujiaochang and went straight along the middle ring road, passed Wuzhou Avenue, and took a short section of the expressway around the city. From a distance, I saw the six big red characters of "Shanghai Yangtze River Tunnel Bridge".

Teacher Yu thought for a while, and said to Du Jianfeng who was driving, Xiao Du, let's not go to Changxing Island first, and drive directly to Chongming on the opposite bank. Let's see what the tunnel bridge looks like, okay?

Ren Xueming, who was sitting in the co-pilot, said with a smile, of course, Mr. Yu.In fact, it is also the first time for us to cross the tunnel bridge, so let's drive all the way to see if it is really as majestic and magnificent as the report said.

On October 31 of this year, after more than four years of intense and difficult construction, the Shanghai Tunnel Bridge was finally fully opened.The project is one of the Yangtze River passages of the national expressway network G40, an important part of the Shanghai-Xi'an Expressway, and a super-large transportation infrastructure project at the Yangtze River Estuary in my country.

The tunnel bridge starts from the No. 26 ditch in Pudong New Area, crosses the waters of the South Port of the Yangtze River Estuary to Changxing Island in the form of a tunnel, and then crosses the waters of the North Port of the Yangtze River Estuary to Chenjia Town in Chongming in the form of a bridge, with a total length of nearly [-] kilometers.

Wang Yiyuan and the others came to Changxing Island this time because of the reunion of the Jiaotong University seminar students first proposed by Ren Xueming during the previous National Day.Since "Eleventh", he has been leading and preparing for this party.

However, it is a little regretful that because the students have their own affairs on weekdays and everyone is very busy, it is not easy for all the students in the whole class to gather together, thanks to the great help of Teacher Yu.

After many twists and turns, it was not easy to arrange the time of this gathering for this New Year's Day holiday.But even so, although the time was changed repeatedly, not all the students who could come to the party were present, and only 12 people came in the end.

After passing the toll booth, the car enters the tunnel.The Yangtze River Tunnel is nearly nine kilometers long, the longest of any river-bottom tunnel in Shanghai.Entering the inside of the tunnel, you can see that inside the semi-circular shield, the ground is flat and clean.

Because of the three-day holiday, there are many vehicles in the tunnel.However, the tunnel project is designed according to the expressway standard, two-way six-lane design, the design load road is Class I, and the design speed is [-] kilometers per hour.Therefore, the roads are relatively spacious in general, the traffic conditions are very good, and the traffic is relatively orderly.

Wang Yiyuan noticed in particular that color blocks were set up on some walls of the tunnel.

Teacher Yu saw Wang Yiyuan's doubts and said with a smile, this is specially designed to relieve the driver's fatigue.

Wang Yiyuan suddenly realized, and said, I remembered.The guardrail of the Hangzhou Bay Bridge seems to have used a similar design.

While driving forward, Du Jianfeng couldn't help sighing that the road we are driving now is at a depth of 40 meters below the surface of the Yangtze River.The waves on the river are turbulent, and the wheels are rolling under the river. What a spectacular scene!

Teacher Yu was also very touched, saying that digging a tunnel under the Yangtze River Estuary is indeed a miracle that has never been seen before.We must know that Shanghai is a coastal city, and the soil is very soft. Digging tunnels here is like making holes in tofu. It is very prone to engineering accidents such as collapse and leakage. The difficulty of the project can be imagined.

Ren Xueming took the topic, laughed, and even some foreigners made a humorous analogy, saying that digging a nine-kilometer-long tunnel under the Yangtze River here is like finding a fulcrum in the universe to reverse the earth. That is to say, it is impossible to realize at all.

Wang Yiyuan said, but in the end, we Shanghainese did it.

Teacher Yu said, yes, Allah Shanghai is amazing. The "South Tunnel" has a total length of nearly nine kilometers, of which seven and a half kilometers pass through the waters.To build a tunnel, it is necessary to use a shield machine to excavate the soil.However, it was really hard to imagine whether this seven and a half kilometers long dark world could succeed once, considering the conditions at the time.

He said that in the end, the two shield tunnels drove nearly eight kilometers at a time, and the deviation of the construction axis was within the standard of plus or minus 75 mm, which was unique in the world and set a world record.

Ren Xueming echoed that the shield diameter of the Shanghai Yangtze River Tunnel is also larger than any shield tunnel that has been built or is under construction in Shanghai, and exceeds the current largest shield tunnel in the world, the GloeneHart tunnel in the Netherlands, reaching 15 meters. It is also the best in the world.

He said that the lower layer of the Yangtze River Tunnel has also reserved rail transit construction lines.In order to facilitate evacuation and escape, longitudinal escape passages are specially set up between the highway layer and the subway floor, and eight evacuation escape passages are also set up between the two up and down tunnels.This is a very advanced and unique design idea.

As the car moved forward, the three of them were full of praise for the construction of the tunnel and bridge.

Teacher Yu said that to build a cross-river channel between downtown Shanghai and Chongming Island, it is necessary to cross the [-]-kilometer-wide Yangtze River.There were more than ten engineering schemes proposed at that time, which can be roughly divided into three types: one is the full bridge scheme, which proposes a bridge fly-span; the other is the full tunnel scheme, which proposes a tunnel crossing.

He said that there is another scheme, the South Tunnel North Bridge, which is to cross the waters of the South Port of the Yangtze Estuary in the form of a tunnel and the waters of the North Port of the Yangtze River Estuary in the form of a bridge.

Ren Xueming interjected, is it our current Yangtze River Tunnel Bridge?

Teacher Yu nodded and said that the reason why the "South Tunnel and North Bridge" scheme was finally adopted was determined by the shape and function of the waterway at the Yangtze River estuary.Nangang is an excellent deep-water port, and it is the only channel for large-tonnage container ships to enter and leave Shanghai Port.

He said that if a bridge is built here, whether it is during the construction period or after a long period of use, it will affect the passage of the main channel of the Yangtze River in Shanghai.Although it is difficult to dig a tunnel, its biggest advantage is that it will not affect shipping and will not hinder the golden waterway at all.

After driving out of the Yangtze River Tunnel, you enter Changxing Island, and after continuing to drive through the two-kilometer bridge connection, you enter the Shanghai Yangtze River Bridge.

The Shanghai Yangtze River Bridge is nearly [-] kilometers long and is a world-class long bridge project built together with public rail.Because of its special location at the estuary of the Wanli Yangtze River, it is also known as "the first bridge of the Wanli Yangtze River".

The whole line of the bridge also has a reverse "S"-shaped bend. The linear layout of this bridge takes into account the impact on the water flow. It is beautiful in shape and meets the requirements of environmental protection, forming a unique landscape.

Looking out from the car, I saw the endless Yangtze River estuary, the blue sky with white clouds floating above, and the endless river below.The 200-meter-high "person" main tower is located. The smooth bridge deck passes through the waist of the main tower and is firmly held by nearly [-] stay cables like strings. "Heaven and man are one", concise and beauty.

(End of this chapter)