Gu Kun doesn't like to discuss specific technical solutions with designers, firstly, because he believes that there is a specialization in the art industry, and secondly, once discussed, it is easy to limit the divergence of ideas.

Project managers have always been tyrants, and I don't care if you can achieve it or not. People who put forward needs think so much and set up a few hairy items.

It's a pity that the gap between reality and ideals is too big, so he has to make an exception.

Under Gu Kun's inquiry, the designers of Tongji Construction Institute, under the guidance and combing of Dean Tong, quickly took several major difficulties to vent their bitterness:

"For this project, if you have to build 800 meters, the biggest problem is the risk of bearing the load of the foundation and the main structure. We don't know how deep the foundation will be, and we don't know the geological foundation at the moment. Even if we know this, the existing reinforced concrete partial stress bearing structure may not be able to support so high, and more than 600 meters is the limit, which is recognized by the industry. ”

This is not necessarily understood by a layman. To translate it in human terms, it is to emphasize the "load-bearing column system of the existing structure", and after reaching a certain height, even the self-weight of its own floor cannot be supported.

For example, the world's major straight skyscrapers, such as Sears in Chicago and the Twin Towers of the World Trade Center in New York, are all of that kind of structure.

Because the outermost ring is a glass curtain wall, the outer wall is actually not load-bearing, that is, it is hung on the load-bearing wall on the inside, and the outermost ring is dragged by the steel truss that stretches out horizontally from the load-bearing wall (it can be understood that the balconies that stretch out to the volley in ordinary residences are supported by ring beams or trusses)

However, because these load-bearing walls are also passable, and the door must be opened on the load-bearing wall, there is a limit to the thickness of the load-bearing wall, and there is also a limit to the proportion of reinforcement.

If the steel-concrete load-bearing wall is thickened in order to further build the building, the marginal effect will appear when it is added to a certain extent. Further thickening, the stress concentrations on the openings of the lower load-bearing walls (e.g., doors and passageways) and the effects of various other architectural jargon can make the thickening more costly.

For the layman to see the excitement, the details are not important, as long as you know that the trick of "thickening the load" cannot be added infinitely.

But this is not impossible to solve, such as making the lower layer of the load-bearing structure completely closed-loop, not allowing the door to be left, not allowing the passage, then it will not be crushed in these weak points. However, this will lead to a wasteful situation on some floors and areas.

The load-bearing wall of the whole floor has no openings and no doors, so isn't the space inside the load-bearing wall inaccessible and unusable? Then why are you building such a tall building? Just build a solid pyramid.

This is also why until the Sears and the World Trade Center Twin Towers, the predecessors did not think of breaking through this limit, it is too cost-effective economically, and the people of Oceania have passed the early stage of getting rich just now, and they can no longer toss for the world's tallest building.

Petronas' Kuala Lumpur Twin Towers are also that kind of backward structure, which is why their world record breaking is so limited, just making a fuss about the spire.

600 meters to 800 meters, what is needed is a new plan for the ship to completely overturn the existing underlying structure!

Fortunately, although Gu Kun doesn't know architecture, he has also studied for four years at Jiaohai Academy, and his engineering foundation is still there.

More importantly, he had a rough understanding of the rough structural features of the Burj Khalifa and Hujiang Center Towers in later generations.

He could only take out a pen and paper and discuss with the designers on paper:

"As for the load-bearing structure, there are indeed bottlenecks in the existing schemes such as the World Trade Center Twin Towers. However, if the load-bearing cylinder is made absolutely closed, with no opening, no door, and no passage, then it will avoid the disadvantages you just mentioned, and it can be infinitely thickened to improve the load-bearing limit.

Of course, the load-bearing column must still have a certain taper, which I don't need to say, you are all experts, you must know these common sense. The further down it gets, the thinner it gets, and the thinner it gets. ”

The so-called taper means that when many cylinders are processed, they should be larger at the bottom and smaller at the top.

The simplest example in life is to look at the street lamp pole and telephone pole, carefully measure and you will find that the street lamp pole is thick below, generally a taper rate of 4 degrees, and the designers who have taken over the municipal project understand. (I also worked as a designer of municipal engineering, seven or eight years ago, and the municipal energy-saving transformation of the LED industry was very popular for a while)

Of course, there is no communication barrier to these common senses.

However, they were still very surprised: "In this way, isn't the space within the load-bearing circle absolutely closed and wasted?

Gu Kun's lower lip pressed his upper lip and blew his forehead contemptuously: "Cut, don't you know, I built this building to grab the world's first? What do you tell me about practicality and building area utilization? If it weren't for the suspicion of cheating and the fact that it is impossible for tourists to directly build a solid pyramid, I would have built it directly!"

I repeat, burn all the indicators that you consider when you serve Party A! I only have one of the highest priority indicators here, the first in the world! The other indicators are considered only after this indicator is met. ”

The people of Tongji Institute quickly fell silent, they were really opened a brainstorm, and more importantly, they entered the industry for half a lifetime, and for the first time they met Party A who did not care about the utilization rate of construction area at all.

Therefore, many of their ideas need to be reversed from the roots.

This can't be blamed on them, after all, Huaxia has only been rich for a few years, and I have never seen such a perverted demand in China before.

Party B's imagination was also cultivated by other Party A before that, and it was a process of mutual shaping.

Finally, a relatively young female designer in Tongji, who looked to be in her 30s, raised her hand boldly: "Since you have said so, I think we can consider that the closed-loop load-bearing structure can be directly reduced into a hollow cylindrical cylinder, and we don't want the original square load-bearing wall of the mouth type, anyway, the space in the structure is ready to be wasted, we make this tube as small as possible, and we can waste less." ”

Gu Kun listened, nodded slightly, and had to admit that in the case of completely tearing down and starting anew, sometimes young people react faster than experienced people.

Of course, this youth is also relative, you must first have solid basic skills, that is to say, you must be at least a doctoral student in the Department of Architecture of Tongji, and then enter the industry for three or five years.

Of course, if you have a PhD in architecture at Tsinghua University, or even a PhD in architecture from MIT, Harvard, and Zurich Polytechnic University, that's even better. (Tsinghua's Department of Architecture is probably barely in the top 10 in the world, and Tongji is estimated to be in the top 20.) ）

It's a pity that the idea of the young female designer was questioned very seriously by the old-school Dean Tong: "How can you casually reduce the size of the load-bearing concrete itself!" This size is to match with the foundation, and the area of the foundation is to match the load-bearing and pressure distribution of the whole building.

With the weight of a monolithic building, the area of the foundation will only be larger than that of all previous buildings. If the load-bearing cylinder is reduced, the connecting part between it and the foundation is like a needle pierced on a piece of iron, and the torque risk itself is greater? If the wind is stronger, the lever torque of the 800-meter building body will not directly ...... the connection between the foundation and the load-bearing cylinder.

"Eh, Dean Tong, brainstorming, if there is a problem, we will solve it, the new plan must have a lot of risks, this is a process that is not broken, please don't be impatient. ”

Fortunately, Gu Kun, as Party A, proposed to stop it in time, and he also took advantage of the situation to spend a few strokes on the paper: "In previous years' plans, the area surrounded by the bearing cylinder is indeed relatively similar to the area of the foundation. However, the cross-section of the load-bearing cylinder is significantly smaller than that of the foundation, and it is not impossible to do.

My idea may have been a flash of inspiration, don't mind, just provide an idea. For example, we make the foundation also have some taper, which is slowly diagonally expanded, and is enclosed with steel plates, just like the foundations of those seventy or eighty meters high wind turbine columns, which wastes space of several underground floors at most, but it should be able to solve the problem of torsional dispersion between the bearing cylinder and the foundation connection. ”

This scheme may be difficult for the layman to understand in words. However, if you search for the foundation construction videos of those wind turbines on the Internet, you will understand the principle. There are many videos from all walks of life on Douyin.

Gu Kun's plan is to treat the load-bearing structure of the skyscraper as an enlarged and reinforced version of the wind turbine.

What other kind of building in the world will be subject to greater wind leverage torque than the same proportion of wind turbines? In fact, the Hujiang Center Tower and the Burj Khalifa in later generations used this kind of structure in the connection structure between the internal load-bearing cylinder and the foundation.

"Think of a skyscraper as a wind turbine with a pole height of 800 meters?" Dean Tong glared at the dog, but his professionalism told him that this idea was very funny.

Of course, there are still very complex calculations and designs required, which are just an idea and are far from being implemented.

"Jiaotong University has produced talents, and we have served together. After pondering for a long time, Dean Tong sighed, he still thought that Gu Kun's opinions were completely read by Jiaotong University Ocean Engineering.

Gu Kun patted the other party's shoulder: "Eh, Dean Tong is too humble, I'm just a fool with a thousand thoughts, and I occasionally get it." It was because I didn't know about the conventions of the industry that I had a wild idea. If you really want to implement the technology, you still have to rely on you professionals, so why bother to be arrogant. ”

Dean Tong didn't say anything more, but just took his subordinates to make a silent estimate.

Many of the original indicators that need to be tangled and weighed, including the treatment of the ground itself, seem to have been solved under this new thinking.

Moreover, Lanfang is located at 3 degrees north latitude, which is similar to the climate and environment of Lijiapo at 1.5 degrees north latitude, basically in the equatorial windless belt.

Even if the local weather data has not been accurately assessed yet, the staircase load bearing and lever torque should be fine. When the foundation is deepened, it is the excellent breeding soil for the world's tallest building.