When Zhao Nanxiao arrived, the meeting had just begun. Qin Gong, the chief engineer of Daqiao Academy, the bridge department, the heads of various research institutes and the main high-level engineers were all there. Hu Yuan was speaking. When Director Gao saw Zhao Nanxiao coming, he hurriedly waved and signaled her to come in.

Zhao Nanxiao went in and sat in an open seat next to him. Lin Yang also attended the meeting, glanced at her casual outfit, smiled slightly at her with a graceful look, and nodded.

After listening to it for a while, Zhao Nanxiao understood that the content of the meeting was about a super-large bridge on the Jinsha River on the border of two western provinces. This bridge is also a landmark project in a key major project in the western region.

The local government and relevant management bureaus began preparing for the preliminary work of the super bridge a few years ago. The command center invited the design institute to participate in the bidding. After preliminary investigation, the design institute won the bid. Now, according to the dean's intention, an investor who originally accounted for the majority could not guarantee the funds were in place in time due to financial problems. He withdrew from the project and instead was the construction party of the project, zj Group, the participating construction party of this project. After taking over, zj, as the owner, put forward the requirements for changing the original design to the design institute.

Today's meeting is about discussing this major change.

Yuan Hu said: "The pre-feasibility study report and workability report of the project have been approved by the State Council. The preliminary funds have been in place, so construction can be started. Now this big change is a great pressure for us. Today, Mr. Qin and I called you to a meeting to listen to opinions widely. You can mention any ideas you have!"

Zhao Nanxiao looked at the original design plan of Ohashi projected on the equipment.

This plan was originally designed by the team of the bridge department, and it adopted the three-tower concrete cable-stayed bridge plan. After this plan is completed, the tower pier will reach 430 meters high, which will be the tallest tower in the world, far exceeding the famous Milo Bridge in France. The owner of the holding company at that time considered the future landscape benefits and pursued the reputation of the bridge, and was very satisfied with this plan with the "world's first".

Now, after detailed survey before construction, zj put forward new opinions, believing that under local geological conditions, the construction of this 430-meter tower pier is very difficult, and the local area is a high-intensity area of ​​earthquakes. According to this plan, there is no other obvious advantage except for winning the title of the world's tallest pier. This is contrary to the "pragmatic" concept that zj Group has always pursued, so it has proposed to the design institute to change the design.

There was a buzzing discussion in the conference room, and new ideas were proposed one after another.

After listening to a few speeches, Hu Yuan said: "I will show you a plan, and you can see what you think."

Secretary plays ppt.

A magnified computer-made bridge construction projection appears on the screen wall.

On the wide valley floor, a steel truss suspension bridge is high, connecting the cliffs on both sides.

Zhao Nanxiao looked at PPT and his eyes stopped.

Hu Yuan said: "This plan is a double-tower single-span steel truss suspension bridge with a span of 1,300 meters. The main beam uses steel truss stiffening beams, and two towers in the east and west, with a height of about 200 meters each."

Chen Gong, a large bridge department who participated in the previous design, first affirmed the design: "The suspension bridge is one of the main forms of large-span bridges recognized worldwide. The bridge location has a steep terrain on both sides, and there is no lifting conditions for the main bridge steel box girders. Steel truss stiffening beams are used. Although there are not many large-span suspension bridges in China with a total span of more than kilometers, it is very feasible."

Director Huang of the Second Institute said that this design does not have a middle beam, which not only makes the tower shape simple and beautiful, but also facilitates construction.

Director Gao, who sat next to Zhao Nanxiao, also spoke, and highly praised: "This design has a symmetrical proportion and the main span is prominent, especially the idea of ​​using steel truss to strengthen the beam. It is not only adapted to local conditions, but is lighter than steel box beams, and has superiority in saving materials and reducing cost. Moreover, the span above the canyon is like a rainbow, majestic and beautiful in shape, which can be said to be a combination of rigidity and softness, which is a high degree of unity of function and beauty."

...

After speaking out, they basically had a positive opinion.

The Hu Yuan and President Qin exchanged a look, nodded, and looked at Zhao Nanxiao, who had never spoken after coming in, and said with a smile: "Everyone's views are basically the same as those of President Qin and I. This design is indeed feasible, and it also has a very unique aesthetic in terms of shape. Let me introduce it below. This is the plan of Zhao Nanxiao, a senior expert."

After Hu Yuan finished speaking, the huge conference room suddenly fell silent. Dozens of pairs of eyes looked at Zhao Nanxiao, with their expressions surprised without exception.

Director Gao is middle-aged and pays attention to health preservation. He holds his cup of wolfberry tea everywhere. When Hu Yuan was talking, he was holding the tea cup to drink water. Suddenly, he heard Zhao Nanxiao's name, choked, coughed a few times, turned his head and looked at her with wide eyes.

Hu Yuan said: "Xiao Zhao, let me tell you how you considered designing such a plan?"

Three years ago, when the hospital first came into contact with this project, it attached great importance to it. There was an activity to collect plans to select the best to form a design team. Zhao Nanxiao had just arrived for a year. The newborn calf was not afraid of tigers and signed up with passion. Although he had no conditions to go to the field for investigation, he went to the library, checked local chronicles, and found relevant information. After reading all the information she could get, he used the time after get off work to conceive the design, and stayed up until the second half of the night every day. Finally, he designed this plan before the deadline.

After handing over, it was naturally sank to the sea and was swallowed up in the waves that the giant aircraft carrier of the Design Institute slashed on the way forward. The Design Institute cooperated with the concept of Party A at that time and adopted a cable-stayed bridge plan that aims to be the world's tallest tower.

After so long, Zhao Nanxiao has long forgotten that he had participated in this project. He suddenly saw his work appearing on PPT, and he was a little overwhelmed.

She met the eyes of the Hu Yuan and Mr. Qin, and slowly stood up from her seat and said, "This is a design I made three years ago when I participated in the hospital solicitation activity. The reason for this plan was to check some information and learn that the local area is located at the intersection of several geological fault zones. It is a high-intensity earthquake zone, and the terrain changes sharply. It belongs to the transitional area of ​​the Qinghai-Tibet Plateau. It suddenly rises from an altitude of 500 meters to more than 2,000 meters. The terrain is steep and the river valley is deep. Therefore, when designing, we focus on earthquake resistance and combine other factors to come up with this plan."

"Thank you, Mr. Qin, and everyone's affirmation."

Her speech was brief.

Mr. Qin said: "Yes. Although Xiao Zhao is young, he has a lot of ideas and a solid foundation. After putting forward new requirements, I reviewed the archives of this project and found this design, which is very highlight. After reaching an agreement with Hu Yuan, I will come up with you today to discuss it."

He looked at Zhao Nanxiao with a smile and took the lead in applauding.

At first, there was only his applause in the conference room, which seemed a little monotonous. After Hu Yuan joined, a warm applause rang out soon, and everyone encouraged Zhao Nanxiao.

Director Gao applauded the most vigorously. When the applause stopped, he said with a smile: "Director, President Qin, Xiao Zhao worked under my hands after he came in. I often encourage her. As long as young people have ideas and feel at ease, the design institute can provide the broadest working stage for young people like them!"

The dean and Mr. Qin smiled and expressed their agreement. The dean said: "There is not much time left for us..."

"Dean, Mr. Qin, I have a plan. I wonder if I can demonstrate it on the spot?"

At this time, Lin Yang, who had not spoken just now, suddenly stood up and said.

"Kobayashi? Of course," President Hu encouraged.

Lin Yang thanked him, took the USB flash drive to the demonstration stand, and played his own files.

A rendering of a continuous steel bridge appeared on the wall curtain.

Lin Yang talked happily: "Dean, Mr. Qin, I have also done a lot of research before the design plan. This place is not only high shock, but also because of its special geographical location, it is a wind farm. It has long been characterized by high wind speed, strong turbulence and large wind attack angle. In this strong wind area, if the design of the suspension bridge is slightly deviated, it may repeat the wind damage accident like the old Tacoma suspension bridge in the United States, so I advocate building a concrete continuous steel bridge here. This beam bridge is classic, especially in terms of wind resistance and torsion resistance, its advantages are very obvious. In addition to considering the maximum wind resistance, my plan also has new creativity. Because the pier height is more than 300 meters, in addition to the conventional double-thin-walled piers, an overall hollow piers are used at the lower part of the pier top to ensure the overall stability of the piers. The core concept of this design is to highlight the combination of classic and innovation under the premise of striving for maximum stability."

He paused and turned to Zhao Nanxiao.

"I also highly agree with the suspension bridge design just now, but one thing I would like to ask Mr. Zhao. How to eliminate the negative impact of wind on suspension bridges in such a strong wind farm environment?"

In the conference room, dozens of gazes shot at Zhao Nanxiao again.

Hu Yuan and Mr. Qin also looked at Zhao Nanxiao, as if waiting for her response.

Zhao Nanxiao stood up again.

"These are experts and senior engineers, with extensive knowledge and rich experience. Since Lin Gong asked, I was just showing off my skills. The reason why the Tacoma suspension bridge collapsed was that its bridge deck was thin and its self-weight was insufficient. The strong winds blew causing the Carmen vortex street to swing, which then caused resonance to cause collapse. This was also one of the most serious engineering design errors in the 20th century. With the lessons of the past, later designs could learn from this and avoid repeating the same mistakes. However, Lin Gong Gong's concerns were still very necessary. In fact, it was not just after completion.

During the construction stage, the wind resistance of the bridge is even more important. Of course, this also requires the cooperation of the construction party. In summary, the calculation of the dynamic characteristics of the early structure, the analysis of the wind field of the bridge site, the three-part force test of the main beam, the tremor test of the segment model, the vortex vibration test, the aerodynamic elasticity test of the whole bridge, the naked tower wind resistance performance test during the construction stage, and other means. As far as my shallow knowledge is concerned, domestic experts have specialized in researching this issue in recent years, and have achieved good results in practice. For details, please refer to the relevant articles of Academician Shen Shiru."

Lin Yang seemed to want to refute, but he couldn't speak for a while.

Yuan Hu and President Qin looked at each other again and nodded.

Hu Yuan said: "Xiaolin, Mr. Qin and I have seen your plan before. It does have highlights, but the shape is relatively conservative. Moreover, the on-site concrete pouring and construction work is large, the equipment investment is high, and the construction period is long. Compared with the suspension bridge plan, the cost is too high and the economy is not advantageous. The owner's requirements are stability, economy, and also strive for beauty. After all, that area is a key area for future tourism development, and the bridge will also be one of the iconic key landscapes."

The meaning of Hu Yuan is naturally not to consider it.

Lin Yang looked a little depressed, but soon, he smiled concealedly and expressed his agreement.

Yuan Hu stood up, looked around, and said, "There is not much time left for us. After discussing, President Qin and I initially decided to optimize the design based on Xiao Zhao's suspension bridge design. Because time is tight and the project is important, President Qin personally took the lead in establishing a design team, and the specific group member list will be decided, and the announcement will be made. Today's meeting will be held here, and the meeting will be dispersed!"

"Xiao Zhao, come and go to my office." President Hu called Zhao Nanxiao.

Zhao Nanxiao followed him to the dean's office with many eyes behind him.

The dean asked the secretary to pour her tea and let her sit down.

"I really didn't expect that there was an outstanding young man like you in our college. I read your resume. I graduated from a prestigious university and got the first place. I have been in for four years, right? I have performed very well. Last year, the shape of the channel tower of the No. 3 cross-sea bridge was improved very well. Although the changes were not large, it saved costs. More importantly, it reduced the risk of workers working for a long time at sea. I originally thought it was a collective resolution, but now I heard that it was based on the idea you put forward at the seminar?"

Zhao Nanxiao smiled: "Thank you, the dean for your encouragement. What's the matter with me?"

President Hu said: "What else is there? Of course, President Qin personally ordered you to serve as an assistant and participate in the design and construction of the Jinsha Bridge! Xiao Zhao, President Qin's previous doctoral supervisor was Academician Shen, who you mentioned just now, and like Mr. Shen, he is famously strict. This time, he will make you a great opportunity. We are designing, and we cannot make good plans just by sitting in the office. After the personnel are decided, General Qin will lead the team to conduct on-site inspections as soon as possible, optimize the plan, and build early. The zj side was very anxious. There is no way. People are God. If there are requirements, we must try to meet them. They will also send people to contact us on site to cooperate with our work. I estimate that this project will take two or three years. When you participate in the construction, the institute will consider promoting you from a technical position to a senior management position."

"How is it, do you have confidence?" The dean looked at her with a smile, waiting for her to nod.

Zhao Nanxiao was silent for a moment and said, "Thank you for your trust from President Qin. Can you let me think about it?"

Dean Hu was stunned: "What's wrong?"

Zhao Nanxiao said: "I am not in good condition recently. It is a big deal. I am afraid that I will accept it rashly, letting you and Mr. Qin down, and delaying my work."

President Hu looked at her: "You went to the Qingling Bridge? I heard from Lao Gao that you will apply for a leave when you come back."

He pondered for a while.
Chapter completed!