The Coming Construction Boom

How tech will free us from the tyranny of rectangularity

3 min read
An illustration of a row of progressively taller buildings.
Edmon de Haro

For the rest of this century, humankind will be building cities at an unprecedented pace. The world population is projected to increase from 7.9 billion to more than 10 billion, and much of that increase will occur in parts of the world that lag in infrastructure. Everywhere, people will expect to catch up, and then surpass. China is a fantastic example of how this can happen in just 30 years.

But there are two other factors that will supercharge the building boom. A large proportion of the people who now live in rural areas will move to cities, just as happened over the last century in North America. That will not only swell the populations of existing cities, it will also create new ones. Concurrently, rising sea levels caused by climate change will swamp many coastal cities throughout the world, forcing them to rebuild parts of themselves on higher ground. Cities including Boston and New York are already spending substantial sums on projects to hold back the sea, which has begun encroaching in subways and road tunnels over the last 10 years. But that is just a small precursor of what will come.

One problem with our current building methods is that they have a high carbon footprint, meaning that the act of building will increase the need for yet more building. Fortunately, construction technologies have been advancing over the last 20 years and we are on the verge of a revolution.

Many of the construction techniques we use today were invented in ancient Egypt or Rome. Examples include concrete, the weighted plumb line to determine true vertical with a square to derive the horizontal from that, and snapping a taut chalk-covered string on the ground to lay out a straight line for a wall. The arch, developed by the Romans, has been superseded by steel beams for the transom over windows and doors, and now digitalization is encroaching on these other time-tested techniques.

Simultaneous localization and mapping (SLAM) was developed in the 1980s and used originally to enable indoor robots to map their surroundings and locate themselves within them, using cameras, lidar, and other sensors. It is now used on construction sites to reconstruct a full three-dimensional model of an environment, just by walking around with one of the latest smartphones, which incorporate depth sensors. These techniques allow the dimensions of partially constructed buildings to be uploaded to CAD models, and then use augmented reality to show workers exactly where to place the next components. Larger and larger components of new buildings are being built offsite in factories, making construction more efficient and less labor intensive.

Many of the techniques we use during construction today were invented in ancient Egypt or Rome.

Other techniques are changing what we can expect buildings to look like. We are starting to see large buildings with lots of plants as part of the environmental control systems, making city buildings look like living organisms. With vertical farming taking hold, many new buildings in cities will be the source of food grown close to where it is consumed. This is literally green technology.

For thousands of years our buildings have been rectangular and largely built in place by craftsmen. In the second half of the 20th century we began mass-producing small-scale building components. These allowed enormous lightweight curtain walls of identical elements, whether of glass, aluminum, or thin stone, mounted to the structural elements, giving buildings a much lighter and different look. But the identical mounting components meant that rectangular designs were pretty much all that could be produced. Now, with 3D printing along with general-form geometric CAD, new shapes will become possible even for low-cost buildings. And as 3D printing progresses to larger and stronger components, even the structural elements will be freed from the tyranny of perpendicularity.

Combine all these factors and a dazzling possibility emerges. Imagine using cheap wind- and solar-generated electricity to pull carbon out of the atmosphere and turn it into feedstock for large-scale 3D printing of building components. Whoever commercializes that will have a shot at pulling off a remarkable first: building the first megabusiness—and megafortune—that reduces atmospheric carbon rather than increasing it.

This article appears in the March 2022 print issue as “Building Boom.”

The Conversation (3)
FB TS16 Feb, 2022

I think so many countries today are experiencing affordable housing problem because the current solution approach (a totally new/expensive building design/construction each time) is no longer working good!

Imagine the massive problem if each car was (still) specifically designed & hand-made for each customer!

So the true solution (IMHO) is creating standard/free building designs of all different sizes which provide huge numbers of micro-apartments!!!

1 Reply
William Adams15 Mar, 2022

why does IEEE keep pushing that nonsense about global warming? ///

you could melt every ice berg, ice floe, ice cube, and polar caps and the sea would not rise more than a few inches. ///

if anyone really believed this nonsense then why do all the celebs and pols keep buying ocean front property? ///

the truth is that all climate is caused by earth orbit and inclination plus solar activity. ///

we have had hotter and colder temperatures in earths history without people or SUVs. ///

if anyone really thought people were the cause they would demand we lower population not destroy the economy with all this 'green' political nonsense.

Deep Learning Could Bring the Concert Experience Home

The century-old quest for truly realistic sound production is finally paying off

12 min read
Image containing multiple aspects such as instruments and left and right open hands.
Stuart Bradford

Now that recorded sound has become ubiquitous, we hardly think about it. From our smartphones, smart speakers, TVs, radios, disc players, and car sound systems, it’s an enduring and enjoyable presence in our lives. In 2017, a survey by the polling firm Nielsen suggested that some 90 percent of the U.S. population listens to music regularly and that, on average, they do so 32 hours per week.

Behind this free-flowing pleasure are enormous industries applying technology to the long-standing goal of reproducing sound with the greatest possible realism. From Edison’s phonograph and the horn speakers of the 1880s, successive generations of engineers in pursuit of this ideal invented and exploited countless technologies: triode vacuum tubes, dynamic loudspeakers, magnetic phonograph cartridges, solid-state amplifier circuits in scores of different topologies, electrostatic speakers, optical discs, stereo, and surround sound. And over the past five decades, digital technologies, like audio compression and streaming, have transformed the music industry.

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