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3Dプリンター住宅 まだ技術革新が必要

3D printed houses still need innovation

I wrote a little about 3D printed houses in my blog the other day, and it seems like they've been featured in the news recently.

After all, the two giants of 3D printer housing in Japan are Serendix, a first-mover, and Obayashi Corporation, a late-starter.

Tokaku: If you Google 3D printer housing, you'll often find sites that summarize things like ``Advantages and disadvantages of 3D printer housing.'' Well, isn't this kind of flimsy content, like it was written by an amateur blogger? There are only articles that make you think. Blogs written by real estate agents also talk about the "advantages and disadvantages of 3D printed houses," but real estate agents only need a real estate license to open a business, so they have to learn about building standards, design, and construction just like architects do. He is not a person who has thoroughly learned about structures, construction methods, and materials engineering. That's why I feel like there are so many articles with very little content.

Article from the other day

3D Printed Houses: Can the world break away from mortgages?

Continued 3D Printed Houses Can the world break away from mortgages?

I think there are many benefits to 3D printed houses.

  1. The structure is almost like a one-piece concrete wall, so it is highly earthquake resistant (I think). In addition, because it is particularly rigid, it does not shake during storms such as typhoons. quiet. Since it is an unreinforced concrete structure, evaluation of earthquake resistance is a high hurdle as it requires approval from the Minister of Land, Infrastructure, Transport and Tourism, which is required for special construction methods that do not comply with the Building Standards Act.
  2. The construction period is short and the cost is low (if mass produced).
  3. Standardization of housing is possible.

Japan is a country prone to earthquakes and natural disasters such as tsunamis and typhoons. Therefore, brick construction and masonry construction (methods of building by stacking stones) are not allowed for housing, as in Europe.

On the contrary, the purpose of the Building Standards Act is to "prevent buildings from collapsing and protect the lives of residents, while preventing damage from small to medium earthquakes and tolerating damage from large earthquakes." That's why the house is destroyed. But it won't collapse.

The point is that it doesn't collapse; that means that no one gets crushed under a house and loses their life, and even if it doesn't collapse, they can continue to pile up in that house Not that you can.

A big earthquake will definitely come.

At that time, if the house you spent tens of millions of yen on collapses in an instant, the house you just built will collapse and you will be left with only a 30-year mortgage.

Personally, I think the biggest benefit would be standardization of housing.

In Japan, there are a variety of ``architects'', including carpenters, local construction companies, major house builders, and major general contractors.

This is also a world of excitement, from a company with real technology to a company with no technology that only builds defective houses.

In the case of 3D printed houses, it will be interesting to see how technology advances in the future as to whether printing is done on-site or in batches at a factory, but at least it will be standardized. I think there will be a move toward mass production of the same raw materials, the same manufacturing methods, and the same designs, and taking advantage of economies of scale to reduce costs.At the very least, technology levels, manufacturing methods, and other things will be standardized, and although there will be some advantages and disadvantages, I think defective housing will disappear. (Will it become less?)

What are the disadvantages of 3D printed houses?

  1. Less freedom in design.
  2. Does not comply with building standards. (It is not that there is a possibility that it will not be done, but that it is not compliant at this stage. Unreinforced concrete construction method is not approved.)
  3. At present, there are only relatively small scale projects.
  4. The basics will probably cost money. (Depending on the ground condition, is a piled foundation necessary? Is the foundation also an integrated type that cannot be 3D printed?)
  5. Technological innovation is needed to enable structural calculations.

As of now, it has not yet been put into practical use, so we look forward to future technological innovations.

What is interesting is that Serendix and Obayashi Corporation are developing 3D printed houses based on completely different philosophies.

Serendix “Eliminating mortgages from the world”

Obayashi Corporation: ``Development of new technology that allows unmanned construction. We would like to apply it to future space base construction.''

Well, major general contractors don't make products cheaply, so they don't want to compete on price. On the other hand, Serendix's current home prices are too high. Who can afford a 30-year loan in these uncertain times? I want to create a house that everyone can buy like a car using new technology. It's like the democratization of housing.

At present, Obayashi Corporation has developed fiber-containing concrete, which has been certified by the minister, and is one step ahead in its practical application.

However, personally, I would like to support Serendix, based on my experience as a structural designer in the past.

If you live in Europe, you'll understand that there are no earthquakes or typhoons. I thought it was great to be in a country where the risk of assets being destroyed is low. In Japan, it is wise not to invest in risky assets all at once, as there is a risk that your assets will be reduced to dust in an instant. Therefore, I think that Serendix's philosophy matches the environment of this country.

One more thing: I think it would be better to avoid sliding windows in Japan. Wouldn't it be better to use specifications like European windows?

It has excellent insulation and airtightness, and when closing the window, simply turn the knob to close it completely. Furthermore, the sash parts, which experience a lot of heat loss, are coated with a plastic with low thermal conductivity, which provides excellent insulation and improves air conditioning efficiency.

In the case of Japanese sliding windows, secrecy is low anyway. The insulation performance is also extremely low. The worst part is that the sash part is made of exposed aluminum, so in winter there is condensation, and the sash part gets very cold.

During typhoons or strong winds, sliding windows have extremely poor airtightness due to their nature, and you will feel a draft from the gap between the sash and the window. It's better not to do this. . . But why are there only this?

Is it a problem with the screen door? Does this mean that new things are difficult to accept?

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