This Hongshui River Bridge is the first railway diagonal bridge in China.

The bridge was completed last year, and it is only now that the railway line has been laid, as well as some electrification equipment has been installed.

The bridge is a prestressed concrete structure with a span of 48+96+48 meters and consolidated tower girders.

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

The two parallel cable faces each consist of three pairs of harp-shaped cables. Each cable is 10 strands, each consisting of 7 steel hinges with a diameter of 5 mm.

The two ends of the cable are provided with specially designed groove pin combination anchors, which are anchored to the tower and the main beam corbel by using the TD-100 general multi-action jack tensioning.

The cable allows for replacement and cable force adjustment during operation. The whole bridge adopts basin type rubber bearings.

The side span adopts the frame method, and the beam body is poured on the scaffold steel beam, and the middle span adopts the cantilever pouring method for construction.

During the design and construction process, Yan Jiecheng required several scale model tests.

The General Engineer's Office instructed the Engineering Bureau to conduct a number of tests on the fatigue of inclined cable anchorage, anti-corrosion, and the preparation of high-strength concrete above 70 megapascals by mixing FON compound superplasticizer.

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

After a few days of hard work, Yan Jiecheng and others finally arrived at the guest the day before the opening of traffic, and they did not stay, and after a simple rest in the evening, they went to the site of the opening ceremony of the Hongshui River Bridge early the next morning.

In addition to the local leaders of the Longcheng Road Bureau, there are also staff of the Academy of Railway Sciences who participated in the acceptance of the bridge, as well as local leaders.

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

"The Academy of Railway Sciences and the Longcheng Road Bureau jointly carried out static load and dynamic load tests. Be scientifically rigorous.

Xia Jinming, vice president of the Academy of Railway Sciences, is responsible for the formation of a professional team to be responsible for the acceptance work. ”

After Yan Jiecheng got off the bus, the leaders of the Longcheng Road Bureau, Xia Jinming, vice president of the Academy of Railway Sciences, and local leaders, all greeted him.

After a few people finished politely, Yan Jiecheng asked Vice President Xia Jinming: "Old Xia, you have participated in all the acceptance work of this bridge, there is no problem." ”

Vice President Xia Jinming hurriedly said: "Dean, we are all in strict accordance with the acceptance process and regulations of the bridge in the ministry, all of which meet the standards, and there must be no problem." ”

After hearing this, Yan Jiecheng nodded and said, "Lao Xia, this time, I have worked hard for you. When you go back, 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. ”

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

In Mao Lao's mouth, he Zhen Jielian has always been a student of someone else's family.

Mao Lao has always praised this Zhen Jielian.

Yan Jiecheng hurriedly looked at the other party, stretched out his hand and said, "Chief Engineer Zhen, I have admired the name for a long time." ”

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

Yan Jiecheng shook Zhen Jielian's hand vigorously and said, "The two of us can be regarded as peers, but brother, you have hurt me." ”

When several people heard Yan Jiecheng's words, they were immediately a little surprised. Yan Jiecheng explained with a smile: "Brother Zhen may not know, I used to study under Mao Lao and learned bridge technology.

Therefore, Brother Zhen has made so many achievements in bridge technology over the years. Every time Lao Mao saw me, he used Brother Zhen to spur me.

I can be regarded as meeting the main lord today, but I have to ask my brother for advice. ”

When everyone heard Yan Jiecheng's words, they all laughed.

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

Later, it continued to innovate, and compiled the static calculation program of the arch bridge.

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

This made Mao Lao always regret that it was not done by his own students.

Yan Jiecheng knows very well that this Zhen Jielian has some unique understanding when he pushed the bridge.

Next, the two exchanged and discussed the future development trend of the bridge, construction materials, design concepts, construction technology and other aspects.

The discussion lasted for an hour, and it was not until the ceremony began that the two of them stopped unsatisfied.

This Zhen Jielian is one year older than Yan Jiecheng, specializing in bridges in technology, full of spirituality, and his future achievements will definitely be not small.

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

Wang Sen has been engaged in bridge design and construction, 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, and as for the opening ceremony, it was just like that.

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

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

Yan Jiecheng did not leave, but followed Zhen Jielian and gave a detailed tour of the bridge.

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

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 arch bridge, which is much higher than his own level.

The next day, Yan Jiecheng and the others stepped on the train to Guangdong. Half a day later, Yan Jiecheng and the others arrived at the headquarters of the Dayao Mountain Tunnel Project Project.

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

Through the explanation of the staff of the command. Yan Jiecheng knew that the original tunnel construction site was in danger of water gushing.

The water inflow is so large that the spare tunnels in the two places next to the tunnel have been filled. Lao Xie is directing people at this time to carry out rescue and blocking operations.

Hearing this, Yan Jiecheng's whole body was numb, Lao Xie must have not listened to him and indulged.

Can you pull around in this tunnel?

Yan Jiecheng didn't care about complaining about Lao Xie, he knew better than anyone else that the danger of water gushing in this tunnel would cause a collapse if it was not handled well.

Not to mention any economic losses, at least dozens of lives have to be put in it.

Therefore, Yan Jiecheng was ready to take a few technicians in the ministry to get on the rail car to the construction site and go to the rescue site.

After all, this construction adopts a new process and new Austrian construction, and Lao Xie's previous experience may not be used.

The staff on the side, seeing this, hurriedly stopped, this place is fatal, although they do not have a comprehensive understanding of this degree of danger, but they cannot ignore the leadership.

Even the people accompanying him in the ministry were all trying to dissuade him, after all, the tunnel was gushing water, which was too dangerous, and if something happened to Yan Jiecheng, none of them could afford to take this responsibility.

At this time, Dai Mao was also so anxious that he was sweating profusely.

If something happens to Yan Jiecheng, what will happen to these people?

But I can't persuade you.

"Okay, let's stop talking.

The front is in the rescue, how can I, as our chief engineer, stay in the rear with peace of mind?

Besides, no one knows this new Austrian construction better than me. I can help.

You can't just watch like this, something happens at the tunnel construction site in front of you, right? ”

After Yan Jiecheng finished speaking, he turned his head to look at Dai Mao and scolded, "What are you doing? I didn't honestly go back and wait. I'm a technician, aren't you making trouble here? ”

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

The rail car is full of water pipes, pumps and other emergency supplies.

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

The place where you park is less than a kilometer away from Yonghe Water Point. After the flatbed truck stopped, everyone was busy carrying emergency supplies from the truck.

The staff of the command center, with the technicians who followed Yan Jiecheng, walked towards the water gushing point.

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

Yan Jiecheng The further they went, the deeper the water became, and gradually it was already up to their knees. The rain boots under their feet have completely lost their effect.

Wearing rain boots filled with water, the whole person walked in the tunnel, and it gradually became difficult.

Yan Jiecheng's expression couldn't help but become serious. He asked the staff on the side, "Are there any preparations for generators and scaffolding?" ”

The staff on the side hurriedly said to him: "Chief Engineer Yan, there are two power generation vehicles at the rescue site. This time, we brought five more diesel generators, and a batch of scaffolding was prepared. ”

When Yan Jiecheng heard this, he let go of the worries in his heart. You must know that the water here is already so deep, there must be more water at the rescue site.

If there were no scaffolding, there would be no place for the generator.

More than a dozen drainage pipes have been laid along the tunnel, and as a group walks through the tunnel, there is not only the occasional loud noise from a distance, but also the rustling sound caused by the concrete absorbing water.

Finally, they walked to the scene of the rescue. At this time, the water in the tunnel was already more than 1.5 meters.

The scene is brightly lit, and the position in front of the drilling cart is illuminated at a glance.

The upper part of the tunnel is like a waterfall, and the water is flowing non-stop, and from time to time it is mixed with mud and sand.

Yan Jiecheng saw Lao Xie more than ten meters away, who was shouting loudly at this moment, as if he was arranging a leak-plugging car to plug the leak.

Yan Xie Cheng saw that Lao Xie was soaking wet at this moment, and he was still staring at the water gushing point. I think it's hard for him to be old.

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

He asked loudly into Lao Xie's ear, "Lao Xie, what's the situation now?" ”

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

Quickly said: "Why did you come here?" It's too dangerous for you to come. ”

Yan Jiecheng said: "You are so little nonsense, hurry up and tell me the specific situation." ”

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

He looked at Yan Jiecheng and said, "When I was digging yesterday afternoon, there happened to be a dark river here, so it caused water to gush out of the tunnel.

At present, we are in an emergency rescue. On the one hand, water is pumped out urgently. On the other hand, a high-pressure pump is used to beat the concrete into it. ”

Yan Jiecheng glanced at the place where the leak was plugged, and said loudly: "Old Xie, it can't go on like this." It doesn't make much sense for you to live in grout like this.

Hurry up and organize a strong team to support the place, and do a good job of supporting and then grouting to play a role.

Otherwise, there will not be enough concrete. The concrete that is driven into it will be washed out with the flow of water. ”

Lao Xie glanced at the place where the grouting was placed, thought for a while and said, "Yes, why didn't I think of it?" It's like patching, hey, dozens of tons of concrete are wasted. ”

After Lao Xie finished speaking in annoyance, he didn't pay attention to Yan Jiecheng. Hurry up and organize the assault team and prepare to do protective support.

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

It's easy to say, but it's not easy to brave the gushing water to do protective support.

Not to mention the high difficulty, there will be personal injuries if you are not careful.

But this matter, you can't do it.

Otherwise, as the water of this dark river continues to wash inside, a huge cavity will form in the upper part of the tunnel.

If the cavity collapses, it will directly threaten the safety of the tunnel. If you don't do it, they will all be buried alive in it.

Yan Jiecheng stared at the water gushing point, thinking carefully. What to do with this support?

Nowadays, the conventional support of this project is made of protective support according to the prefabricated concrete segments.

But now the water gushing in this place is so serious, and it is still a question mark whether the strength of this prefabricated concrete segment can meet the standard.

At this time, Lao Xie came back after assigning the task.

Yan Xie Cheng told Lao Xie about his worries, Lao Xie thought about it for a while, and then found that the problem was far more complicated and dangerous than he thought.

Yan Jiecheng thought for a moment and asked, "Old Xie, how deep is the tunnel buried in this place?"

Is there a way to carry out penetration, grouting directly from the outside of the mountain? ”

When Lao Xie heard this, he shook his head and said: "This place is buried more than 270 meters deep, and there is no way to grouting from the mountain. ”

As soon as Yan Jiecheng heard that the burial depth was more than 200 meters, he knew that this method was useless at all.

He thought for a while and said, "Lao Xie, since this is the case, then we only have dead horses as live horse doctors."

After the support of the concrete segment is done, a ring of steel plates is added to the outside.

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

When Lao Xie heard Yan Jiecheng's words, he quickly nodded and said, "Yes, yes, yes, add another layer." Really let Lao Tzu do a good job of this protective support, there is the largest cavity in it, and we are not afraid.

The big deal is to fill it with concrete. ”

Faced with this situation, the measures to deal with it have been agreed upon. Both of them hurried into action.

The division of tasks is very clear, and Lao Xie continues to be responsible for on-site command here. And Yan Jiecheng had to hurry out and contact the steel plate used to reinforce the support.

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

(End of chapter)