The underground excavation industry is exploring mini robots, plasma torches, and superheated gas to replace the massive boring machines now in use.
FOR DECADES, ENGINEERS seeking to build tunnels underground have relied on huge tube-like machines armed with a frightening array of cutting wheels at one end—blades that eat dirt for breakfast. These behemoths, called tunnel-boring machines, or TBMs, are expensive and often custom-built for each project, as were the TBMs used to excavate a path for London’s recently opened Elizabeth Line railway. The machines deployed on that project weighed over 1,000 tons each and cut tunnels over 7 meters in diameter beneath the UK capital.
But British startup hyperTunnel has other ideas. The firm proposes a future in which much smaller, roughly 3-meter-long robots shaped like half-cylinders zoom about underground via predrilled pipes. These pipes, around 250 millimeters (10 inches) in diameter, would follow the outline of the proposed tunnel’s walls. Once inside them, the bots would use a robotic arm topped with a milling head to penetrate into the surrounding earth and carve out small voids that would then get filled with concrete or some other strong material. Piece by piece like this, the structure of a new tunnel would come together.
“We’re talking about thousands of them,” says hyperTunnel’s director of engineering, Patrick Lane-Nott. “Much like an ant colony or a termite colony works in swarms.”
Continue reading… “Swarms of Mini Robots Could Dig the Tunnels of the Future”
