To be honest, Tang Fei was also a little worried.

Of course, there is no problem with your own shield machine, the best and most advanced large shield machine in the world, and the quality is also leveraged. But it is very difficult to limit land subsidence to less than 5 mm. In addition, the factors that cause ground subsidence are not only the shield machine, but also some human factors, such as whether or not to operate in accordance with the regulations.

It is estimated that the largest is the human factor.

There are some geological conditions, but the shield machine is not in the deep underground construction, the construction depth is only tens of meters, the geological conditions of Dongyang City are not complicated, there is no geological fault zone like the Dagongshan tunnel, hot spring water gushing zone and so on.

Tang Fei personally went over to make everyone pay attention to it, and strictly follow the rules and regulations to operate and construct, and not to be sloppy. The president of Jiuzhou Industrial Group has come in person, at least the engineering and technical personnel of Jiuzhou Heavy Industry there should pay attention to it.

In addition, Tian Hao must be specially told that Dongyang City must not operate in violation of regulations. In addition, Tang Fei also wanted to see the real performance of his shield machine.

When the TBM passes under this section of ancient city wall, how much will the ground subsidence, 2, 3 mm, 4, 5 mm, or more than 5 mm?

Chen Guihong nodded and said: "Brother, in such a situation, you are really worth going over in person, if you can really control the land subsidence within 5 mm, then it will set a new record, and it is still a world record." ”

At present, there is no shield machine that can ensure that the ground settlement is controlled within 5 mm during the construction of subway tunnels.

The German shield machine is not good, the American shield machine is not good, and the Japanese shield machine is even worse!

The two walked and talked, and gradually, the rumbling in their ears gradually became louder, and after walking for a distance, they finally saw the "Caiyun" that was being constructed at the end of the tunnel. I saw that it was like a giant sand-swallowing beast, and it was struggling to dig there.

Behind the shield machine, there are a lot of workers, a lot of construction equipment, some workers are placing the steel skeleton, and some workers are pouring concrete.

A little further on, you can see the steel structure support on the cave wall, and you can also see some workers operating construction equipment to spray cement mortar and reinforce the cave wall.

"Brother, let's go ahead and take a look at the 'Caiyun'. Chen Guihong proposed, and it can be seen that he has walked into the "Caiyun" more than once.

Now that he came, the "Caiyun" was in front of him, and Tang Fei's interest also came up, and he boarded the large shield machine under construction with Chen Guihong and walked into its interior.

The interior of the shield machine is very large, and many workers are busy, carrying out various operations, and you can also see a large amount of mud and rock, which is sent out through the conveyor belt.

Eventually, the two walked into the control room of the "Caiyun", where there were not only two or three operators, but also a technician from Jiuzhou Heavy Industries.

In the control room, there are various instruments and meters, and there are several large display screens, one of which can clearly see the excavation of the cutterhead.

Chen Guihong said with satisfaction: "Brother, your shield machine is really advanced, and I have also inspected the shield machine imported from abroad, but it is definitely not so advanced." ”

Tang Fei smiled slightly, Jiuzhou Heavy Industry's shield machine, which represents the highest level of shield machine in the world today, at present, no shield machine in the world can be compared. Foreign shield machines are either backward in technology or worse in performance.

Chen Guihong said: "Brother, after all the shield machines are in place, our Line 2 will have multiple shield machines for simultaneous construction, at that time, the construction progress will be very gratifying, and it has become a foregone conclusion that Line 2 will complete the construction ahead of schedule." ”

"It's not a secret, after the whole line of Line 2 is dug up, we should consider ordering subway locomotives, it is estimated that about 20 trains will be needed, my opinion is to continue to order your subway, and the relevant report will be sent to Mayor Qiao for approval. ”

The relationship between the two is good, so Chen Guihong will talk to Tang Fei about this. It was precisely because of the good relationship that Tang Fei jokingly said: "Brother Chen, are you no longer bidding for the subway?"

Without thinking about it, Chen Guihong waved his hand directly and said: "Don't engage in bidding, direct procurement." Practice has proved that your subway is much better than the imported one, which has been fully reflected in the process of operation in Changzhou City. ”

Tang Fei laughed, "Brother Chen, you are welcome to continue ordering our subway at any time, whether it is a type A car or a type B car, whether it requires a 6-car train or an 8-car car, we can produce and manufacture them all." ”

The two watched in the tunnel for a long time, and it was not until late evening that the two went out of the tunnel together, found a restaurant, asked for a private room, and the two drank wine, ate food, and chatted.

A few days later, Tang Fei prepared to go to Dongyang City.

At this time, the large shield machine had already excavated nearly a kilometer, and it was already very close to the ancient city wall. After a few dozen meters, it is estimated that you will reach directly below the ancient city wall.

The experts of the Dongyang City Cultural Relics Protection Bureau, is simply like a great enemy, in the area where the shield machine will pass, a lot of ground sensors have been installed early, and the ground is strictly detected, once it is found that it is not right, it is estimated that the construction of the subway will be stopped immediately.

Zhou Xiping is an expert in the protection of cultural relics, and he is also one of the people who resolutely oppose the construction of the subway in Dongyang City, on the grounds that the subway construction will cause ground subsidence and damage to ancient buildings.

Under his proposition, the large shield machine will pass through this ancient city wall, and a lot of ground sensors will be placed, and today, Zhou Xiping is here in person.

"Xiao Xie, how is the monitoring going?"

Xiao Xie replied: "Expert Zhou, everything is normal, and there is no abnormality in the ground sensors." ”

Impossible.

Zhou Xiping was puzzled, and thought in his heart, how could the ground sensor not respond, such a large shield machine is working underground, and the ground must have a response.

Could it be that the shield machine has not yet arrived under the city wall, thinking so in his heart, Zhou Xiping personally called and asked the construction party of the subway tunnel.

The other party told him that it was only a few tens of meters, and at most tomorrow afternoon, the large shield machine would arrive directly below the ancient city wall, and then it would pass through the city wall.

It's only a few tens of meters, the distance is not too far, and the sensor will have some changes and some reactions. Zhou Xiping was not at ease, and personally checked several ground sensors, but there was indeed no response.

Something doesn't seem right.

After thinking about it, Zhou Xiping instructed Xiao Xie and others to move two of the ground sensors forward dozens of meters and directly above the shield machine.

In other words, a few dozen meters directly below the location of the sensor is the large shield machine under construction. Zhou Xiping thought in his heart, this time, there should be a reaction.

However, there was still no response.

Zhou Xiping was puzzled, and carefully checked these ground sensors, and after checking them, he asked: "Xiao Xie, why are all domestic ground sensors, and how many imported sensors are?"

Xiao Xie replied: "The number of imported sensors is limited, so we use all domestic sensors. ”

Zhou Xiping waved his hand and said: "Use all the imported sensors, it may be that the sensitivity of the domestic sensors is not enough, you see, they have no response." ”

He attributed the reason to domestic ground sensors.

Xiao Xie didn't dare to slack off, took the imported ground sensors, installed them, and concentrated on monitoring the land subsidence.

……

It is estimated that no one had the idea that near this section of the ancient city wall, a young man, carrying a high-end camera, dressed in casual clothes and wearing tourist shoes, was taking pictures everywhere.

People who don't know think that the man is just an ordinary tourist, but in fact, he is Matsumoto Teru of Yamazaki Heavy Industries, and according to Maeda Shiyasu's instructions, he went to Dongyang City this morning, took a camera, and took pictures of the section of the city wall that the large shield machine was about to pass through.

I took a lot of photos, because the camera was good, and they were all taken relatively clearly. Obviously, he was going to take a picture of the ancient city wall before the shield machine passed through it, before it was damaged.

After taking a lot of photos, Matsumoto felt that was enough, and then he left the old city walls and found a nearby hotel to stay.

He was going to take pictures again in two days, at that time, the large shield machine had just passed under the city wall, which had caused the ground to subside, and the ancient city wall would be damaged and cracked, and he was going to take pictures of all the damage to the city wall and take the photos back.

……

The shield machine is about to pass under the ancient city wall, and will usher in the first real test, Tang Fei took Ling Zan, the chief engineer of Jiuzhou Heavy Industry, to Dongyang City.

Tang Fei arrived in the evening, and Tian Hao personally went to the airport to pick up the plane, and arranged a sumptuous dinner to fulfill the friendship of the landlord.

After eating, Tian Hao told Tang Fei that about tomorrow afternoon, the shield machine will be excavated directly below the ancient city wall, and it can be heard in the words that Tian Hao is still more worried.

In case it causes a large area of ground subsidence, it will be troublesome. Cultural relics protection experts say that the land subsidence should not be greater than 5 millimeters, and Tian Hao has prepared for the worst, in case the subsidence is 7 or 8 millimeters, he will also forcibly carry out construction.

The next day, in the afternoon.

At about three o'clock, accompanied by Tian Hao and many other middle and senior executives of the Dongyang Metro Company, Tang Fei and Ling Zan came to the vicinity of the ancient Great Wall.

Looking up at the ancient Great Wall, Tang Fei could completely feel its historical precipitation, that kind of quaintness, vicissitudes, and seemed to rush towards him. I thought to myself, it would be a pity if such a thousand-year-old ancient city wall was damaged because of the construction of the subway.

Tian Hao was next to Tang Fei, he looked at the time and said, "Mr. Tang, the large shield machine has arrived directly below the city wall, let's go over and take a look." ”

The group arrived at the city walls.

Standing under the city wall, Tang Fei touched the city wall, and said in his heart, the real test has begun, I don't know, how his shield machine is performing.

"Huh!"

Tang Fei was slightly surprised, he didn't expect that there were also a lot of ground sensors installed here, and he also saw some people who were obviously not from Dongyang Metro Company. They looked like people who were working on cultural relics.

……

Today, we will continue to see three more, and the second one will be sent!