The Boss of the Yan Family in Siheyuan

Chapter 332 Lao Xie was disobedient and Yan Jie became numb.

This Xiangjun Laibin Hongshui River Bridge is the first railway cable-stayed bridge in China.

The bridge was completed last year, and only now have the railway lines been laid and some electrification equipment installed.

This bridge adopts a prestressed concrete structure with a span of 48+96+48 meters and reinforced tower beams.

The main beam is a three-span continuous double-chamber box beam with a height of 3.2 meters, and the tower is 29 meters high.

The two parallel cable planes each consist of three pairs of cables arranged in a harp-shaped arrangement.Each cable has 10 strands, and each strand consists of 7 steel hinges with a diameter of 5 mm.

Specially designed slotted pin combination anchors are installed at both ends of the cable, which are tensioned using a TD-100 universal multi-action jack and anchored to the tower and main beam corbels.

The cables allow for replacement and cable tension adjustments during operation.The entire bridge adopts pot-type rubber bearings.

The side span adopts the frame method, and the beam body is cast on the scaffolding steel beam, and the middle span adopts the cantilever casting method.

During the design and construction process, Yan Jiecheng requested multiple scaled-down model tests.

The General Engineering Office guided the engineering bureau to carry out multiple tests on fatigue cable anchorage, anti-corrosion and the use of FON compound water-reducing agent to prepare high-strength concrete above 70 MPa.

After the completion of the entire bridge, Yan Jiecheng asked the local railway bureau and the Railway Academy to conduct static and dynamic load verification tests using heavy-duty locomotives with an axle load of 20 tons and a total weight of 508.8 tons under operating conditions.

After several days, Yan Jiecheng and others finally arrived at Laibin the day before it was opened to traffic. They did not stay. After a brief rest at night, they went to the opening ceremony of Laibin Hongshui River Bridge early the next morning.

In addition to the local leaders of the Longcheng Road Bureau, there were also staff from the Academy of Railway Sciences involved in the bridge acceptance work, as well as local leaders.

Yan Jiecheng looked at the bridge in front of him and still remembered his instructions when the bridge was accepted.

"The Academy of Railway Sciences and Longcheng Road Bureau jointly conduct static load and dynamic load tests. It must be rigorous and scientific.

Vice President Xia Jinming of the Academy of Railway Sciences is in charge, and a professional team has been established to be responsible for the acceptance work. "

After Yan Jiecheng got off the car, the leaders of the Longcheng Road Bureau, Vice President Xia Jinming of the Academy of Railway Sciences, and local leaders all came to greet him.

After a few people were polite, Yan Jiecheng asked Vice President Xia Jinming: "Lao Xia, you have participated in all the acceptance work of this bridge, so there is no problem."

Vice President Xia Jinming hurriedly said: "Dean, we strictly followed the ministry's bridge acceptance procedures and regulations and conducted the acceptance tests. All of them met the standards. There must be no problems."

After hearing this, Yan Jiecheng nodded and said, "Lao Xia, I have worked hard for you during this time. When I get back, I will give everyone a week off and have a good rest."

After Vice President Xia Jinming expressed his gratitude, he introduced a middle-aged man next to Yan Jiecheng and said: "Dean, this is Comrade Zhen Jielian who is responsible for the design and construction of this bridge."

After Yan Jiecheng heard this, he immediately became interested.This Zhen Jielian is a familiar stranger to Yan Jiecheng.

In Mao Lao's words, he, Zhen Jielian, has always been someone else's student.

Mr. Mao always praised Zhen Jielian.

Yan Jiecheng quickly looked at the other person, stretched out his hand and said, "Chief Engineer Zhen, I have long admired your name."

Zhen Jielian said quickly: "Hello, leader, I am also very excited to see you."

Yan Jiecheng held Zhen Jielian's hand hard and said, "We are colleagues, but brother, you have hurt me."

Several people were surprised when they heard Yan Jiecheng's words.Yan Jiecheng smiled and explained: "Brother Zhen may not know, but I used to learn bridge technology from Mr. Mao.

Therefore, Brother Zhen has made so many technical achievements in bridges over the years.Every time Mr. Mao sees me, he always uses Brother Zhen to spur me on.

I have met the real owner today, so I need to ask my brother for advice. "

Everyone laughed when they heard Yan Jiecheng's words.

In 68, Zhen Jielian pioneered a new construction technology for double-curved arch bridges without supports, which solved the problem of building arch bridges without erecting arches.

Later, they continued to innovate and compiled a static calculation program for arch bridges.

Now he has presided over the design and construction of the Laibin Hongshui River Bridge, which has gradually standardized the technology of reinforced concrete box arch bridges.

This has always made Mr. Mao regretful that this was not done by his own students.

Yan Jiecheng knew very well that Zhen Jielian had some unique understandings when he was pushing the bridge.

Next, the two exchanged and discussed the future development trends of bridges, construction materials, design concepts, construction techniques and other aspects.

The discussion lasted for an hour, until the ceremony began, and the two of them stopped with unfinished content.

This Zhen Jielian is one year older than Yan Jiecheng. Technically, he specializes in bridges. He is very spiritual and will definitely have great achievements in the future.

This man reminded Yan Jiecheng of Wang Sen, the chief engineer of their ministry's Bridge Bureau.The two of them are very similar. They are both experts specializing in bridges. Yan Jiecheng feels that Zhen Jielian will definitely go further than Chief Engineer Wang in the future.

Wang Sen has been engaged in bridge design and construction work and has participated in dozens of large-scale bridge projects.

He was one of the main designers of the two world-famous bridges on the Yangtze River.

Yan Jiecheng came here mainly to visit and learn the design and construction technology of the bridge. As for the opening ceremony, it was just like that.

After Balabala's speech, a train passed the bridge under the eager eyes of everyone.

At this time, there was a burst of warm applause and cheers.At this point, the opening ceremony of the bridge is concluded.

Yan Jiecheng did not leave, but followed Zhen Jielian and paid a detailed visit to the bridge.

The person in charge of design and construction explained to him that Yan Jiecheng had a thorough grasp of the bridge's design concepts and construction methods.

After listening to Zhen Jielian's explanation, Yan Jiecheng couldn't help but sigh in his heart, this guy is really talented, especially in the area of ​​arch bridges, which is much higher than his own level.

The next day, Yan Jiecheng and the others boarded the train to Guangdong.Half a day later, Yan Jiecheng and the others arrived at the Dayaoshan Tunnel Project Headquarters.

When they arrived at the project headquarters this time, Lao Xie did not come to greet them.

through explanations from command staff.Only then did Yan Jiecheng know that there was a danger of water gushing in the place where the tunnel was originally constructed.

The amount of water flowing in was so large that the two spare tunnels next to the tunnel were completely filled.Lao Xie is currently directing people to carry out emergency sealing operations.

Hearing this, Yan Jiecheng's whole body went numb. Lao Xie must have ignored his words and let himself go.

Is it possible to shit in this tunnel?
Yan Jiecheng didn't bother to complain about Lao Xie. He knew better than anyone else that the dangerous level of water gushing in the tunnel would cause a landslide if not handled properly.

Not to mention economic losses, at least dozens of lives will be lost inside.

Therefore, Yan Jiecheng prepared to take several technicians from the ministry and get on the rail car to the construction site to go to the rescue site.

After all, this construction uses a new technology and a new Austrian construction method, and Lao Xie's past experience may not be useful.

The staff on the side quickly stopped when they saw this. This place was dangerous. Although they did not fully understand the degree of danger, they could not put their leaders in danger.

Even the people accompanying him in the ministry kept trying to dissuade him. After all, the tunnel was flooded and it was too dangerous. If something happened to Yan Jiecheng, none of them would be able to bear the responsibility.

Dai Mao was also sweating profusely at this time.If something happens to Yan Jiecheng, what will they do?
But I can't persuade him.

"Okay, everyone, stop talking.

The rescue is going on at the front. As our chief engineer, how can I stay at the rear with peace of mind?

Besides, no one knows this new Austrian construction method better than me.I'll go, maybe I can help.

You can't just watch like this. Something happened at the tunnel construction site ahead, right? "

After Yan Jiecheng finished speaking, he turned to look at Dai Mao and cursed: "What are you doing? You are not honest enough to go back and wait. I am a technician, are you not causing trouble by following me?"

Then Yan Jiecheng ignored others and boarded the rail car with a few technicians.

This rail car pulls water pipes, water pumps and other emergency supplies.

After half an hour's drive, we finally arrived at the point where the water was gushing.

The parking place is less than one kilometer away from the water point.After the flatbed truck stopped, everyone was busy carrying emergency supplies from the truck down.

The staff of the headquarters, along with the technicians who followed Yan Jiecheng, walked to the water gushing point.

It was very noisy inside the tunnel, and distant noises could be heard everywhere.

Yan Jiecheng and the others walked deeper and deeper into the water, gradually reaching their knees.The rain boots under their feet have completely lost their function.

Wearing rain boots filled with water, walking in the tunnel gradually became difficult.

Yan Jiecheng couldn't help but look serious.He asked the staff on the side: "Are the generators and scaffolding ready?"

The staff on the side quickly told him: "General Manager Yan, there are two generator trucks at the rescue site. We have brought five more diesel generators this time, and we have also prepared a batch of scaffolding."

When Yan Jiecheng heard this, he put down his worries.You must know that the water here is already so deep, there must be more water at the rescue site.

If there is no scaffolding, there is no place to put the generator.

More than a dozen drainage pipes have been laid along the tunnel. As the group walked in the tunnel, apart from the occasional loud noise coming from a distance, there was also the gurgling sound caused by the concrete absorbing water.

Finally, they arrived at the rescue scene.At this time, the water in the tunnel had exceeded 1.5 meters.

The site was brightly lit, illuminating the position in front of the drilling cart.

The upper part of the tunnel is like a waterfall, with water flowing continuously, sometimes mixed with sediment.

Yan Jiecheng saw Lao Xie who was more than ten meters away. He was shouting something loudly, as if he was arranging a leak-stopping truck to stop the leak.

Yan Jiecheng saw that Lao Xie was soaked all over and was still staring at the point where the water was gushing.I think he is working hard at his age.

Yan Jiecheng held on to the working equipment on site and climbed to Lao Xie's side with difficulty.

He asked loudly into Lao Xie's ear: "Lao Xie, what's going on now?"

Lao Xie heard a sudden voice in his ear.He suddenly looked back and found that it was Yan Jiecheng, and then he looked stunned.

He quickly said: "Why are you here? It's too dangerous, you shouldn't be here."

Yan Jiecheng said: "Stop talking nonsense and tell me the specific situation quickly."

With the arrival of Yan Jiecheng, Lao Xie seemed to have a backbone.The whole person relaxed involuntarily.

He looked at Yan Jiecheng and said: "When we were digging yesterday afternoon, there happened to be an underground river here, which caused the tunnel to flood.

Currently, we are conducting emergency rescue operations.On the one hand, water is pumped out urgently through a water pump.On the other hand, a high-pressure pump is used to drive concrete inside. "

Yan Jiecheng took a look at the place where the leak was blocked and said loudly: "Lao Xie, this won't work. It doesn't make much sense for you to live in it and grout it like this.

Hurry up and organize a task force to support the area. Only when the support is done well can grouting be effective.

Otherwise, if this continues, no amount of concrete will be enough.The concrete that is driven in will be washed out with the water flow. "

Lao Xie took a look at the grouting place, thought for a moment and said, "Yeah, why didn't I think of it? It's just like patching, and it's a waste of dozens of tons of concrete."

After Lao Xie finished speaking in annoyance, he ignored Yan Jiecheng.Hurry up and organize the attack team to prepare for protective support.

Although he saw that Lao Xie had already taken action, Yan Jiecheng's serious expression did not change at all.

It sounds simple to say this, but it is actually not easy to do protective support while braving the gushing water.

Not to mention the high difficulty, personal casualties may occur if you are not careful.

But it’s impossible not to do this.

Otherwise, as the underground river water continues to wash away inside, a huge cavity will be formed in the upper part of the tunnel.

Once this cavity collapses internally, it will directly threaten the safety of the tunnel.Maybe people like them will be buried alive inside.

Yan Jiecheng stared at the water point and thought carefully.How to do this support?
Nowadays, the conventional supports for this project are all protective supports made of prefabricated concrete segments.

But now that the water inflow is so severe in this place, there is still a question mark as to whether the strength of these prefabricated concrete segments can meet the standards.

Just at this time, Lao Xie came back from assigning tasks.

Yan Jiecheng told Lao Xie his concerns. Lao Xie thought about it for a while and realized that the problem was far more complicated and dangerous than he thought.

Yan Jiecheng thought for a moment and asked: "Lao Xie, how deep is the tunnel buried in this place?
Is there any way to perform grouting directly from outside the mountain? "

After hearing this, Lao Xie shook his head and said, "This place is more than 270 meters deep. There is no way to grout from inside the mountain."

When Yan Jiecheng heard that the burial depth was more than 200 meters, he knew that this method was useless.

Then he thought for a while and said: "Old Xie, if that's the case, then we only have a dead horse as a living horse doctor.

After completing the support for the concrete segments, add a ring of steel plates to the outside.

This kind of steel plate must be of high strength, preferably more than five centimeters. "

After hearing what Yan Jiecheng said, Lao Xie nodded quickly and said: "Yes, yes, yes, add another layer. I really asked you to complete this protective support. Even if it has the largest cavity inside, we are not afraid.

The worst case scenario is just filling it with concrete. "

Faced with this situation, now that the handling measures have been agreed upon.Both of them took action quickly.

The division of tasks is very clear, and Lao Xie continues to be responsible for on-site command work here.And Yan Jiecheng wanted to go out quickly to contact the steel plates for reinforcement and support.

After all, their engineering headquarters did not prepare this thing in advance, so they could only contact other places for emergency processing.

(End of this chapter)