Chapter 124

The engineer who was the first to speak spoke eloquently.

In his opinion, the entire tunnel section was constructed using the subsidence method.

In addition to proposing a set of specific construction processes for the four stages of the subsidence method, several reasons for using the subsidence method are also cited.

The engineer's point of view was echoed by many people, but again, there was no shortage of objections.

Another professor of environmental biology from Jiangsu and Zhejiang University lifted the microphone, "I don't agree with Engineer Zhu's point of view. ”

"Everyone, please look at this map of the sea. ”

The large screen in the synagogue shows a topographic map of the waters of the Bohai Sea.

The professor of Zhejiang University drew a black line on the topographic map, "According to the construction plan given by Engineer Zhu, the tunnel should be such a slightly curved straight line shape. ”

"But!" the professor drew a red circle on the map where the black line intersected, raising the volume of his speech.

"In this area, it is the scope of the Qidong Marine Reserve of the Bohai Sea, and there are more than 30 species of benthic organisms living in this area, including 8 species of annelids, 11 species of molluscs, and 15 species of arthropods, all of which belong to the national protected animals. ”

"Once the tunnel is constructed using the subsidence method, it will be devastating to these protected organisms. The environmental biology expert from Zhejiang University spoke in a deep voice.

"Then take a detour!" said somebody.

"No, I can't. It was the engineer who had just proposed the use of the subsidence method technology that had just spoken, and he shook his head with a wry smile, "In that sea area, the terrain and geology that meet the conditions for the subsidence tunnel are the only areas. In the case of a detour, the total length of the tunnel is estimated to reach 200 kilometers. ”

As soon as Zhu Engineer's words came out, the person who wanted to speak just now instantly fell silent.

200 kilometers, which is enough to increase the length of the tunnel by 1.5 times.

I'm afraid that the funds needed are not enough for 300 billion.

"What about the migration of those sea creatures?" someone said, frowning.

"Not realistic. As soon as the man finished speaking, another marine biologist stepped forward to speak.

The rest of the experts who couldn't grab the opportunity to speak couldn't bear to be lonely and whispered to the person next to them.

In almost a few minutes, the whole synagogue became as lively as a vegetable market.

But in the wet market, people are selling goods.

But here, it's knowledge.

And Gu Lu was tapping on the keyboard with his ten fingers quickly, recording everyone's opinions and those interesting ideas.

…………

The discussion continued.

After the plan to build the tunnel by the subsidence method was rejected, there was no proposal to use the subsidence method.

On the contrary, the two factions that support the shield method and the roadheader method have their own opinions and debate endlessly.

However, both the shield method and the TBM method have a big drawback.

That's ...... Expensive!

That's right, it's expensive.

In the construction of short-distance undersea tunnels, this gap is not obvious.

However, once the distance exceeds 10 kilometers, the cost of money will gradually increase with the length of the distance, both in terms of materials and labor.

A hundred kilometers down, 200 billion is definitely not enough.

Moreover, there are many difficulties in the construction of the shield method and the roadheader method.

For the sinking method, as long as the docking problem of the immersed tunnel is dealt with, everything will be fine.

However, the shield method is different from the roadheader method, there are no major difficulties, but there are a lot of small technical difficulties.

For example, when using equipment to dig tunnels, how to ensure that the surrounding soil and rock layers do not collapse and instabilize.

When the equipment relies on the jack thrust to move forward, how to control the total thrust of the equipment so that it will not move forward and bulge the frontal soil due to extrusion because the thrust is too large, because the thrust is too small to affect the propulsion speed.

And so on and so forth, there are a lot of difficulties.

Moreover, due to the different geological conditions of each sea area, there is no possibility of learning from other completed projects.

The discussion continues.

Time passed like this.

Chief Engineer Zheng, who was sitting on the rostrum, frowned, looked at the experts of the two factions who were arguing fiercely in the hall, and got up and came to the first row of academicians.

Looking at the few old people who were leisurely drinking tea here, Zheng Chun smiled helplessly.

"You're not in a hurry at all. ”

"What's the hurry, the discussion meeting, the discussion meeting, should be like this now. ”

"But this time. Zheng Chun pointed to the time on the watch on his wrist, "You don't want to watch everyone starve." ”

"Then I, tell me my plan?" Among the fourteen people who spoke, the scholar of engineering structure named Li Qiangqi.

"No problem, Elder Li, I'll calm them down now. Zheng Chun's face was overjoyed.

Zheng Chun took the microphone and coughed a few times, signaling everyone to stop the discussion for the time being.

Then he made a gesture of please to Academician Li.

Academician Li smiled, and the computer was connected to the large screen in the center of the hall.

"Next, please ask Academician Li to tell us about his construction plan. Zheng Chun spoke loudly.

Below, there was instant applause.

Academician Li's expression did not change, his thin palm controlled the mouse, opened a picture, and then said with a smile, "I'll talk about a plan I have figured out." ”

"Of course, my plan is not necessarily the right one, nor is it necessarily the most suitable. So, if you have some comments and other points of view, please feel free to mention them. ”

"Now, let's get down to business. ”

What is presented in front of everyone is a construction concept drawing.

From the figure, it can be clearly seen that the tunnel construction scheme adopted by Academician Li is neither the burial method, nor the shield method or the roadheader method, but ......

A combination of shield method and burial method!

In the northern section of the Bohai Tunnel, which accounts for about one-third of the total length of the tunnel, the shield method was used to construct the tunnel.

The rest of the tunnel sections are buried by the sinking method.

Many engineering experts, at the first glance of this photo, Qi Qi's pupils shrank suddenly.

This......

Some are beyond their comprehension.

This kind of undersea tunnel, which uses two tunneling technologies at the same time and then splices them together, has never had a precedent in the world.

Never!

"In this scheme, just the connection between the shield tunnel section and the buried tunnel section is a big problem!"

"It's more than that. The specifications of the tunnel obtained by the two construction methods are different, one is built under the seabed, and the other is built on the seabed, how to splic?"

"This is an unprecedented attempt, although I have not yet come up with any ideas, but I believe that Academician Li will not be so untargeted, let alone put forward this construction plan without any theoretical support. ”

"Wait, I seem to have figured out the crux of the matter, look at the small picture in the upper right corner of this big picture. ”

"This, hiss——!"

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