Chapter 124

The engineer who spoke first spoke eloquently.

His point of view is to use the burying method for construction of the entire tunnel section.

In addition to proposing a set of specific construction procedures for the four stages of the burying method, several reasons were also cited to explain the reasons for using the burying method.

The engineer's views are agreed with by many people, but again, there are bound to be objections.

Another professor of environmental biology from Jiangzhe University held up the microphone and said, "I don't agree with Engineer Zhu's point of view."

"Everyone, please look at this sea map."

The large screen in the auditorium displays the submarine topographic map of the Bohai Sea.

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

"But!" The professor from Zhejiang University drew a red circle on the map where it intersected the black line and spoke louder.

"This area is the scope of the Bohai Qidong Marine Reserve. In this area, there are more than 30 species of benthic organisms, including 8 species of annelids, 11 species of molluscs, and 15 species of arthropods, all of which are national-level

ANIMAL CROSSING."

"Once the tunnel construction method is adopted, it will cause a devastating blow to these protected organisms." The environmental biology expert from Zhejiang University said in a deep voice.

"Then take a detour!" Someone said at this time.

"No." The one who spoke was the engineer who just proposed the submersion method. He smiled bitterly and shook his head. "In that sea area, the only topography and geology that meets the conditions for a subsidence tunnel is that area. If we take a detour, the tunnel

The total construction length is estimated to be 200 kilometers."

As soon as Engineer Zhu said these words, the person who just wanted to speak fell silent instantly.

200 kilometers, fully increasing the tunnel length to 1.5 times its original length.

I'm afraid 300 billion yuan is not enough for the funds needed.

"What about the migration of those marine creatures?" Someone frowned and asked.

"It's not realistic." As soon as this person finished speaking, another marine biologist stood up and spoke out.

The other experts who couldn't get a chance to speak couldn't bear to be lonely and started discussing in low voices with the people around them.

In just a few minutes, the whole hall became as lively as a vegetable market.

But in the wet market, people are selling goods.

But here, it's knowledge.

Gu Lu, on the other hand, was tapping rapidly on the keyboard, recording everyone's opinions and interesting ideas.

…………

The discussion continues.

After the engineer Zhu's plan to use the submersion method to build the tunnel was rejected, there was no subsequent proposal to use the submersion method.

On the other hand, the two groups that support the shield method and the tunnel boring machine method have their own opinions and argue endlessly.

However, both the shield method and the boring machine method have a big flaw.

That’s…expensive!

Yes, it is expensive.

For short-distance undersea tunnel construction, this gap is not obvious.

However, once the distance exceeds ten kilometers, the cost of money, whether in materials or labor, will gradually increase as the length increases.

After 100 kilometers, 200 billion is definitely not enough.

Moreover, there are many construction difficulties with the shield tunneling method and the tunnel boring machine method.

For the immersed tunnel method, as long as the docking problem of the immersed tube tunnel is properly handled, everything will be fine.

However, the shield tunneling method and the tunnel boring machine have different laws. There are no major difficulties, but there are a lot of small technical difficulties.

For example, when using equipment to excavate a tunnel, how to ensure that the surrounding soil and rock layers do not collapse and become unstable.

When the equipment is pushed forward by the thrust of the jack, how to control the total thrust of the equipment so that the front soil will not move forward and bulge due to extrusion due to excessive thrust, because too small a thrust will affect the propulsion speed.

Wait, wait, there are a lot of difficulties.

Moreover, due to the different geological conditions of each sea area, these technical difficulties cannot be borrowed from other completed projects.

The discussion still continues.

Time passes like this bit by bit.

Chief Engineer Zheng, who was sitting on the rostrum, frowned and looked at the two groups of experts arguing fiercely in the auditorium. He stood up and came to the academicians in the first row.

Looking at the elderly people drinking tea leisurely here, Zheng Chun gave a helpless smile.

"You elders are not in a hurry at all."

"Why are you so anxious? Discussions and discussions should be the way they are now, so everyone can express their opinions."

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

"Then let me tell you my plan?" The one who spoke was among the fourteen people, the academician of Engineering Structure named Li Qiangqi.

"No problem, Mr. Li, I will ask them to calm down now." Zheng Chun looked happy.

Zheng Chun took the microphone and coughed several times, signaling everyone to stop the discussion temporarily.

Then he made a gesture of invitation to Academician Li.

Academician Li smiled and connected the computer to the big screen in the center of the auditorium.

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

Below, applause broke out instantly.

Academician Li's expression did not change at all. He controlled the mouse with his skinny palm, opened a picture, and then said with a smile, "I will talk about a plan I have thought up."

"Of course, my plan may not be right, nor may it be the most appropriate. So if you have any opinions or other opinions, feel free to mention them."

"Then let's get to the point."

What is presented to everyone is a construction concept drawing.

From the picture, it can be clearly seen that the tunnel construction plan adopted by Academician Li is neither a burying method, nor a shield method or a boring machine method, but...

The combination of shield method and burying method!

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

The rest of the tunnel section adopts the burying method.

Many engineering experts' pupils suddenly shrank when they first saw this photo.

this……

Some are beyond their understanding.

Because this kind of undersea tunnel that uses two tunnel construction technologies at the same time and then splices them together has never been seen before in the world.

Never!

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

"More than that. The tunnels obtained by the two construction methods have different specifications. One is built under the seabed, and the other is built on top of the seabed. How to splice them together?"

"This is an unprecedented attempt. Although I haven't thought of any ideas yet, I believe that Academician Li will not be so aimless, let alone propose this construction plan without any theoretical support."

"Wait a minute, I seem to have found the key to the problem. Look at the small picture in the upper right corner of this big picture."
Chapter completed!