Gu Kun doesn't like to discuss specific technical solutions with designers. Firstly, he believes that there are specialties in the industry, and secondly, once the discussion is started, it is easy to limit the divergence of ideas.
Project managers have always wanted to be tyrants. I don't care whether you can implement it or how. The person who made the request thought so much and still established a project with a few cents.
Unfortunately, the gap between reality and ideal was so large that he had to make an exception.
Under Gu Kun's questioning, the designers of Tongji Academy quickly sorted out several major difficulties under the guidance of Dean Tong and complained:
"If you insist on building 800 meters of this project, the biggest problem is the risk of load-bearing of the foundation and main structure. We don't know how deep the foundation needs to be, and we don't know the geological foundation at the moment. Even if we know this, the existing steel bars
I'm afraid the concrete load-bearing structure cannot support that high. More than 600 meters is the limit, which is recognized by the industry."
Laymen may not understand these words. To translate it into human language, it emphasizes the "load-bearing column system of the existing structure". After reaching a certain height, even the self-weight of the floor itself cannot support it.
For example, the current major straight-tube skyscrapers in the world, such as the Sears in Chicago and the Twin Towers of the World Trade Center in New York, are all of that type of structure.
Because the outermost ring is a glass curtain wall, the outer wall is actually not load-bearing. It is hung on the inner load-bearing wall. The outermost ring is held by the steel trusses extending horizontally from the load-bearing wall (it can be understood as those extending in ordinary residences).
The balcony that goes out to the sky is supported by ring beams or trusses)
However, because these load-bearing walls must be passable and doors must be opened on the load-bearing walls, there is a limit to the thickness of the load-bearing walls and a limit to the proportion of steel bars.
If in order to raise the building further, the steel-concrete load-bearing wall should be thickened. When the thickness is increased to a certain level, marginal effects will appear. If the thickness is further increased, the openings (such as doors and passages) of the lower load-bearing wall will bear concentrated stress, and various other problems will occur.
The effects of miscellaneous architectural terminology will make the gains outweigh the losses of thickening.
For laymen watching the excitement, the details are not important, as long as you know that the "thickening and load-bearing" trick cannot be added infinitely.
But this is not impossible to solve. For example, if the lower layer of the load-bearing structure is completely closed, no doors or passages are allowed, then it will not be crushed at these weak points. But this will
It will lead to a lot of waste on certain floors and areas——
A whole floor of load-bearing walls has no openings or doors. Wouldn't the space inside the load-bearing wall be inaccessible and unusable? Then why are you building such a tall building? Just build a solid pyramid.
This is why, until Sears and the Twin Towers of the World Trade Center, no one in the past thought of breaking through this limit. It was too economically uneconomical. The people of Oceania were past the early stages of becoming rich as nouveau riche, and there was no need to fight for the tallest building in the world.
toss.
Petronas' Kuala Lumpur Twin Towers are also backward structures, so their ability to break world records is limited to just making a fuss about the spires.
From 600 meters to 800 meters, what is needed is a new ship plan that completely overturns the existing underlying structure!
Fortunately, although Gu Kun didn't understand architecture, he had studied at Jiaotong University for four years as an undergraduate, and his engineering foundation was still there.
More importantly, he had a rough understanding of the rough structural features of later Burj Khalifa and Hujiang Center Building.
He could only take out a pen and paper and discuss with the designers on paper:
"As for load-bearing structures, existing plans such as the Twin Towers of the World Trade Center do have bottlenecks. However, if the load-bearing tubes are made absolutely closed, with no openings, doors, or passages, then wouldn't that avoid what you just said?
The disadvantage is that it can be infinitely thickened to increase the load-bearing limit.
Of course, the load-bearing column must still have a certain taper. I don’t need to say more about this. You are all experts and you must know this common sense. The lower you go, the thicker it becomes, and the higher you go, the thinner it becomes.”
The so-called taper means that when processing many cylinders, they should be larger at the bottom and smaller at the top.
The simplest example in life is to look at street light poles and telephone poles. If you measure them carefully, you will find that street light poles are all thicker at the bottom, usually with a taper rate of 4 degrees. Designers who have taken over municipal engineering projects all know this.
I also worked as a designer for municipal projects, maybe seven or eight years ago. At that time, municipal energy-saving renovations in the LED industry were very popular)
Of course, the experts in building Tongji Hospital have no communication barriers with these common senses.
However, they were still very surprised: "If we do this, the space within the load-bearing circle will be absolutely closed, and it will be wasted? How can we use a house without doors and passages?"
Gu Kun pressed his lower lip to his upper lip and blew his forehead contemptuously: "Tch, you don't know, I built this building to be the first in the world? What practicality and floor area utilization rate are you talking to me about?
If it were not possible to build a solid pyramid directly, it would be suspected of cheating, and it would not be suitable for tourists to visit, so I would have just built a solid one!
Let me say it again, burn all the indicators you consider when serving other parties! I only have one highest-priority indicator here, which is No. 1 in the world! Other indicators will only be considered after this indicator is met."
The people who built the hospital in Tongji quickly fell silent. They were really enlightened. More importantly, this was the first time in half their lives that they encountered a client who didn't care about the utilization rate of the building area.
Therefore, many of their ideas need to be overthrown from the root.
We can't blame them, after all, China has only been rich for a few years, and we have never seen such perverted demand in the country before.
Party B's imagination was also cultivated by other Party A before this. This is a process of mutual shaping.
Finally, a relatively young female designer from Tongji who looked to be in her 30s raised her hand bravely: "Since you said so, I think we can consider directly reducing the closed-loop load-bearing structure into a hollow cylindrical tube.
We don’t want the original square load-bearing wall with a square shape. Anyway, you are already mentally prepared to waste the space in the structure. Let’s make this tube as small as possible to reduce waste.”
Gu Kun listened and nodded slightly. He had to admit that when it comes to completely tearing things down and starting from scratch, young people sometimes react faster than experienced people.
Of course, this young age is also relative. You must first have solid basic skills, which means you must be at least a doctoral student in the Tongji Department of Architecture, and then work hard in the industry for three to five years.
Of course, it would be better if you have a PhD in architecture from Tsinghua, or even MIT, Harvard, or Zurich Institute of Technology. (Tsinghua’s architecture department is probably barely in the top ten in the world, and Tongji is probably barely in the top twenty.)
Unfortunately, the idea of the young female designer was seriously questioned by the old-school Dean Tong: "How can the size of the load-bearing concrete itself be reduced casually? This size must match the foundation, and the area of the foundation
It must be coordinated with the load-bearing and pressure sharing of the overall building.
When the whole building is so heavy, the area of the foundation will only be larger than all previous buildings. If the load-bearing tube is reduced, the connection part between it and the foundation is like a needle stuck in a piece of iron. How risky is the torque itself?
?If the wind force is stronger, the lever torque of the 800-meter-high building will directly break the connection between the foundation and the load-bearing tube..."
"Hey, Dean Tong, let's brainstorm. If there is a problem, we will solve it. There will definitely be a lot of risks in the new plan. This is a process that cannot be broken or established. Please be patient and don't be impatient."
Fortunately, as Party A, Gu Kun promptly stopped him. He also took advantage of the situation and wrote a few strokes on the paper to indicate: "In previous years' plans, the area enclosed by the load-bearing tube and the area of the foundation are indeed relatively similar. However,
, the cross-section of the load-bearing tube is obviously much smaller than the foundation, so it is not impossible to do it.
This idea of mine may be a flash of inspiration. Don’t mind it, just think of it as providing an idea. For example, we made the foundation with some tapers, which slowly expanded diagonally, and were surrounded by steel plates, like
The foundations of wind turbine columns that are 70 to 80 meters high waste at most a few underground floors, but the problem of torsion dispersion at the connection between the load-bearing tube and the foundation should be solved."
This set of plans may be difficult for laymen to understand if they are described in words. But if you search the Internet for videos of foundation construction of wind turbines, you will understand the principle. There are many videos of this kind from all walks of life on Douyin.
Gu Kun's plan actually treats the load-bearing structure of a skyscraper as an enlarged and reinforced version of a wind turbine.
Which type of building in the world is subject to a greater wind leverage torque than a wind turbine of the same proportion? In fact, the later generations of the Hujiang Center Building and the Burj Khalifa used steel to connect the internal load-bearing tubes and the foundation.
The structure of this type of principle.
"Treat a skyscraper as an 800-meter-high wind turbine?" Dean Tong was stunned when he heard this, but his professionalism told him that this idea was very interesting.
Of course, the specifics require very complicated calculations and designs. This is just an idea and is far from being implemented.
"Jiaotong University produces talents, and we are convinced." After pondering for a long time, Dean Tong sighed with emotion. He thought that all these insights of Gu Kun came from studying marine engineering at Jiaotong University.
Gu Kun patted the other party's shoulder: "Hey, Dean Tong is too modest. I'm just a fool who thinks a lot, and I only get something once in a while. It's precisely because I don't understand the original conventions of this industry that I have wild ideas. I really want to do this.
The implementation of technology still depends on professionals like you, so why belittle yourselves."
Dean Tong didn't say anything else, he just made a silent calculation with his subordinates.
Many of the indicators that originally required tangled trade-offs, including the treatment of the foundation itself, seem to have been solved under this new idea.
Moreover, Lanfang is located at 3 degrees north latitude, which has a similar climate and environment to Lijiapo at 1.5 degrees north latitude. It is basically in the equatorial windless zone.
Even if the local weather data has not been accurately assessed yet, the load bearing of the stairs and the torque of the lever should be no problem. If the foundation is deeper, it will be excellent breeding soil for the world's tallest building.