Receiving this good news, everyone cheered up.

The master of the aviation repair team personally conducted a detailed inspection of the immersed tube again, and finally reported to the command room very seriously: "All the inspections have been completed, and there are no problems." ”

They are responsible for the outfitting of the immersed tube.

Ballast water system, communication system, monitoring system......

More than 100 main lines, more than 1,000 branch lines, and intricate pipelines are connected from the immersed pipe to the Jin'an 3 command cabin control center.

These lines are nerves that connect the brain to various parts of the body, and every contact must be connected to the place, and every line must be unobstructed.

If there is a problem with the line when sinking, there will be a situation where the hands and feet cannot move and the eyes cannot see, and the immersed tube will not be able to successfully complete the accurate docking.

The installation of these lines is the responsibility of the team of the master manager.

When Chief Engineer Lin first joined the work, he was also a fitter who learned from the master, and in a way, they were actually peers.

So when I went to inspect before, Chief Engineer Lin and Master Guan had a very happy conversation.

"The operation skills of this master are very exquisite, and it is rare that he is not only highly skilled, but also has the ingenuity to keep improving. Chief Engineer Lin adjusted his posture to straighten his back: "He has confirmed, it should be fine." ”

There will be no problem with immersed pipes, and outfitting, even if they arrive at the scene, they may not be more professional than the pipe master.

Lu Zi'an and Chief Engineer Su had no objection to this, and after another meeting to discuss, they decided to implement the docking immediately.

In order to ensure that the various pipe sections of the immersed tunnel can be accurately connected, the aviation maintenance team has established a measurement system and adjustment device.

When all the instruments are turned on, the screen in the command room instantly changes the image content.

The scanning total station automatically tracks the prism on the measurement and positioning control tower, and calculates the current position of the pipe section with a computer according to the measurement results, which is displayed on the screen.

"We have upgraded the measurement system several times after many measurements, and the results are very good. Chief Engineer Lin said proudly: "Look at this image, how clear!"

It is no longer a monotonous single line, and the image on the screen is not only very clear in every part, but also the different parts are distinguished by different colors, making it easier for them to adjust.

But Lu Zi'an is more concerned about the ultrasonic detection device, which is commonly known as the underwater three-dimensional system.

He believes that only by combining the two can more efficient results be achieved.

"Countdown, three, two, one. ”

Lu Zi'an's voice was still very calm, and everyone could clearly hear his heartbeat.

The moment to witness the miracle is coming.

Everyone was sweating, expectant and nervous.

"Let's go!"

With the roar of the machine, the immersed tube descends at a constant speed.

The clean line of the foundation groove is clearly presented in the eyes of everyone, and the descent speed of the immersed tube is very slow, but because the two systems cooperate with each other, the command room can grasp the absolute position and status of the immersed tube in time.

It's a great feeling for everyone to have everything under control.

Under the guidance of Lu Zi'an's command, the immersed tube was safely, correctly and in the shortest possible time.

Watching the immersed tube on the screen fall steadily into the foundation groove, everyone sighed softly.

At this point, the docking procedure has been completed for the most part.

The ultrasonic detection device automatically measured the mutual distance, horizontal and vertical deviation, and tilt of the pipe section between the immersed pipe and the end face of the artificial island, and the detection results were processed by the computer to display the image, and quickly sent to the command room after processing.

After confirming that the immersed tube had reached the fixed position, Lu Zi'an gave another order: "The diver is in position." ”

The screen immediately switched to the artificial island, and the real-time monitoring clearly showed that as soon as Lu Zi'an's voice stopped, the divers had already entered the water.

They carried out a very rigorous large-scale, multiple inspections to confirm the correct position and ensure the safety and success of the sinking docking.

Looking at the green lights lit up, everyone's eyes gradually opened a shallow smile.

When the last light was turned on, and the immersed tube had been twisted to 10 meters away from the buried section, Lu Zi'an ordered the ballast tank to be opened.

1,900 tons of ballast water were injected into the immersed tube, which showed a 0.01 degree lateral tilt.

After doing all this, he said in a deep voice: "Everyone evacuate and return to land immediately." ”

Docking is about to be made, and no one is allowed to stay in the sea.

Once all divers have surfaced, the staff begins to give real-time feedback.

"Diver evacuation complete!"

"The windlass is in place!"

“……”

With all the preparations ready, Chief Engineer Su Lin and Lu Zi'an glanced at each other, and cautiously pressed the button together: "Start docking!"

It was a very solemn atmosphere, and you could hear pins falling in the room.

The tube is so slow that it's barely noticeable that it's moving.

However, it is indeed moving, and the installation ship of two ships and four machines is linked, and the 70 cm and 1.35 m are lowered synchronously, so as to adjust the longitudinal slope of the immersed tube to 2.996%, which is parallel to the foundation bed.

By the time the immersed tube stopped again, it had been moved to 1 meter from the buried section of the artificial island and lowered 1 meter.

After the state of the immersed tube is stable, the two machines of the Jin'an No. 3 installation ship are lowered by 0.3 meters synchronously, so that the head of the immersed tube is first implanted.

Then the two machines of the Jin'an No. 2 installation ship were lowered 0.3 meters synchronously to make the tail end of the immersed tube landed.

In order to achieve the most accurate docking accuracy, Lu Zi'an required the operator to fully compress the GINA waterstop through jack pulling, hydraulic crimping and fine adjustment in the pipe after difficult attitude adjustment and data review.

Finally, the docking is complete!

Everyone subconsciously stood up, and some even began to applaud.

Mr. Lin and Mr. Su still kept their sanity and were not tempted by the victory in front of them.

"Quick, calculate the data, how much is the error?" Chief Engineer Su immediately stood up and leaned over slightly to ask.

"Okay, I'm doing the math. "The staff quickly made adjustments and calculations, and made various calculations based on the data fed back.

Lu Zi'an closed his eyes slightly, his fingers tapped lightly on the tabletop, and he came to the conclusion even faster than theirs: "The error is about seven centimeters." ”

Before he could finish speaking, the staff had already given a more accurate number: "The error is seven centimeters." ”

Fortunately, the strings in Chief Engineer Su's heart were finally loosened.

Seven centimeters.

The accuracy of immersed tube docking is very high, and excessive deviation may cause tunnel leakage, and the accuracy is controlled within 15 cm abroad.

Although seven centimeters is not small, for such a behemoth, seven centimeters can almost be said to be very small.

"This data, no. Lu Zi'an looked at the screen calmly, his eyes sharp: "I want to readjust the position, you see, this is this place, it is deviated by three centimeters, so the overall deviation is seven centimeters, if it can be adjusted here, there is no need to move much, fine-tune it, the error of these seven centimeters will be reduced by at least four centimeters." ”

Chief Engineer Lin and Chief Engineer Su breathed for a moment, and said in unison: "Are you sure?"

Not really.

Lu Zi'an did not answer their question, but said quickly and decisively: "Although the international precision is controlled within fifteen centimeters, it is considered that this is qualified, but because there is no precedent and standard in China, especially this bridge is very important, I think we should self-pressure and raise this standard to 5 centimeters." ”

If you follow Lu Zi'an's standard, the current accuracy is really not enough.

However, it was finally successfully docked, and if you need to adjust it again......

I'm not afraid of 10,000, I'm afraid of what if......

Chief Engineer Su looked at Lu Zi'an silently for a moment, frowning slightly: "Do you really want to adjust?"

"Yes, and it has to be adjusted. "Lu Zi'an's attitude is very firm, there is no doubt about it.

Engineers have different opinions, and some of them feel that this accuracy is already very rare, and even in the international arena it is a very good result, and it is impossible to adjust it to less than five centimeters, so there is no need to adjust it at all.

The other part felt that since Master Lu proposed it, it should be feasible.

The two parties immediately argued again, but Chief Engineer Su Lin did not speak for a long time.

After a long confrontation, it was Lu Zi'an who finally ended the argument with one sentence.

"Such a big project, seven centimeters here, seven centimeters there, all put it through, there are a total of more than thirty immersed tubes, what a huge number does it add up?" His voice was not sharp, but his words were very polite: "Since you want to do it, do your best, if something really goes wrong, I will bear it!"

"Yes, since you want to do it, you will do the best!" Chief Engineer Su and Chief Engineer Lin had cold eyes, and they actually stood up tacitly: "We believe in you, we believe in ourselves even more, if there is a problem in the adjustment, we will accompany you to bear the consequences!"

With them taking the lead, other engineers gradually changed their minds.

Yes, they can't afford any mistakes in this project, and since they have the opportunity to do their best, do they give up the opportunity to correct their mistakes because they are afraid of failure?

In the end, the changed plan was unanimously approved.

The diver enters the water again to take detailed measurements.

It's not all over again, but a lot of the process has to be redone.

Seeing the immersed tube being moved again, everyone was sweating in their hearts.

Under the command of Lu Zi'an, as he said, he adjusted it slightly up by three centimeters on the left side.

This time, even Lu Zi'an felt his heartbeat increase a little.

But his voice was still very calm: "Start docking!"

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