Chapter 596

The idea of Dome City is not new. As early as last century, some architects and science fiction creators have put forward such an idea.

However, at that time, due to the influence of various factors such as environment and science and technology, although some people tried, they ended up with nothing.

In these people's ideas, the dome city should be covered by a huge dome, isolated from the outside rain and snow and other adverse weather effects, at the same time can control and adjust the light, temperature and other factors, to build a perfect living environment.

There are not many such plans and designs, but because of the huge investment and the strong industrial and technological support, so far, this idea has remained on paper.

Although there are also some buildings that can be called domes, they do not meet Chen Xin's requirements.

The most important point, of course, is that the scale is not large enough.

At present, most of the domes built by human beings are only individual buildings. No matter how large they are, they are almost the size of a stadium or an airport or a station. Compared with Chen Xin's expectation of a city scale, they are naturally far behind.

However, these dome buildings still give Chen Xin a lot of reference.

In fact, one of the important reasons restricting the emergence of Dome City is that this technology is not very useful under normal circumstances.

Although it sounds nice to say that a huge dome envelops the city and insulates it from the invasion of rain, snow and other disastrous weather, other effects that follow also need to be considered comprehensively.

With the constraints of construction cost, construction difficulty itself, and the bigger the city is, the bigger the dome it needs, this kind of thing that looks beautiful and has a bright future will become less practical.

Another important factor is the dome itself.

Chen Xin's Research Center originally used steel structure and glass exterior wall. Although it used new materials, its overall weight is still not light.

Fortunately, the scientific research center is not too big, and it can be supported by steel structure and glass external wall. In addition, the external wall also has snow removal measures, so there is no risk of bearing too much load and overall collapse.

But to extend the dome to cover a whole city, the total weight of the steel structure and the glass wall will reach an amazing level.

So if we want to really build the dome, the materials and structure of the dome itself need to be carefully considered and designed.

The simpler way is to reduce the height of the dome, widen its arc, and make it into a flat arc similar to the dome of the scientific research center, instead of making a hemispherical cover.

This can not only save materials, but also reduce the weight of the dome, which can support the dome covering a city in the current situation.

Arc dome itself can effectively prevent the accumulation of snow, as long as with the appropriate snow removal system, the dome itself is not worried about the possibility of snow fall and collapse.

Even so, Chen Xin does not intend to continue to use glass curtain wall as the external wall of the dome.

The first is the weight of the glass itself. In addition, the dome that envelops a city is to be built. Undoubtedly, the consumption of glass is also amazing. He doubts whether there are so many composite glass needed today.

And using glass dome, construction difficulty and construction period are the problems that need to be faced seriously.

In contrast, another material is undoubtedly more suitable.

This material is ETFE membrane, more formally known as ethylene tetrafluoroethylene copolymer membrane.

Ethylene tetrafluoroethylene copolymer membrane as a crystalline polymer, melting point is 256 ~ 280 ℃. It can self extinguish when burning. It has high shear strength and low temperature impact resistance, which is the best among the existing fluoroplastics. It has high impact strength from room temperature to - 80 ℃, stable chemical properties, good electrical insulation and radiation resistance.

It can be said that it is the most ideal material for making dome among all materials at present.

In the 1990s, this kind of material has been used as covering or film material.

The water cube, one of the main stadiums of Yanguo 2008 Olympic Games, is also an external wall made of this material.

If the dome is made of this material, it can achieve the lightest mass with enough strength.

As for the problem of cold insulation, we only need to cover the outer layer of ETFE membrane with another layer of insulation material to solve this problem.

With such a large dome that can keep warm and cold, the area covered by the dome can leave the deep underground shelter and resume the life on the ground before the disaster.

After all, it has been two or three years since the disaster. Although there will still be meteorites falling from the sky, the number has been greatly reduced, and the surface is no longer so dangerous. The safety of the dome city is still enough to guarantee.

And even if hit, ETFE membrane damage repair, no doubt than the glass curtain wall to the simple, but also more convenient for maintenance and repair.

After solving the dome problem, the rest of the urban construction problem itself, which does not need to worry, the City builders of Yanguo have enough experience in this area to solve all these problems.

After such a calculation, Chen Xin found that the conditions for the construction of a dome city are already in place, and there is no technical obstacle to move forward.

If the dome can be built, with a dome to block the cold outside, even without large heating facilities such as energy tower, the temperature inside the dome will not be too low.

As long as the internal heat is not lost, the ambient temperature in the dome can be maintained in an acceptable range, so that people who originally need to avoid the cold in the underground shelter can return to the surface life.

Not to mention, as long as an energy tower is erected in the dome, the temperature in the dome can be the same as that in the scientific research center, so that the four seasons can be like spring, and even support a basic need to restore the ecological environment.

Thinking of this, Chen Xin has quickly sorted it out according to his own mind, and plans to report it to the state to promote the construction of Dome City.

However, before reporting, Chen Xin felt that he should first come up with a complete set of design, rather than hand in such a rough plan.

Although the construction of Dome City is feasible in theory, how much impact such a huge dome will bring, how difficult the construction is, whether it can be successfully completed in today's environment, if it is to be built, where it is to be built, and how to complete the construction are all things that need to be considered.

So after Chen Xin hesitated for a while, he decided to improve the whole scheme first, at least after the feasibility study, and then report it.

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