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Two boring machines have cut 5.5 miles toward each other under a British Columbia mountain, one pressing disc cutters into granite and the other pumping clay and water in ahead of itself to hold up an estuary, and the tunnel they leave behind gets flooded on purpose
3+ day, 19+ hour ago (511+ words) Sep 10, at 2:00pm ET If you’ve ever had water coming into your basement, deliberately flooding a construction project probably sounds like a fairly terrible idea. I’d want an explanation, too. But the crew building a gas pipeline tunnel near Squamish, British…...
Glencore sank a shaft 8,530 feet under Ontario from the bottom of a mine it closed in 2009, and put five lithium-ion locomotives and 23 battery machines down there so it would not have to pump cooled air a mile and a half to keep the crews working
6+ day, 3+ hour ago (571+ words) Sep 8, at 6:30am ET You’ve heard every version of the battery argument that exists at street level. Range, charging times, what the grid can handle, whether the truck weighs too much. I’ve written my fair share of those stories myself. But…...
An 86-ton borer has cut the hole that will take a 27-ton canister of spent nuclear fuel, 27.6 feet deep and 5 feet 9 inches wide in granite that formed 1.9 billion years ago, and it is allowed to wander less than an inch off vertical the whole way down
1+ week, 4+ day ago (701+ words) Drilling a hole in rock is about the least delicate job on a construction site. You line the bit up, pour on the torque and let the machine chew. Nobody shows up afterward with measuring gear to check whether the…...
A 26-foot borer cut 1.1 miles under a Queensland coal mine in 1,000 hours, came up to the surface in one piece and sat there for eleven years, and it is going back down in Arizona wearing a cutterhead four and a half feet wider than the hole it last cut
2+ week, 4+ day ago (1425+ words) Most tunnel boring machines are built for one hole and never see a second one. They get cut to a specific diameter for a specific rock, they are expensive to drag back out, and more than a few end up…...
A 197-foot German shaft borer is hanging like a chandelier under an English national park, 2,966 feet down, a spinning drum milling 8-inch passes while a vacuum sucks the rock out — nobody on the floor, no explosives, 2,283 feet still to go
3+ week, 2+ day ago (1121+ words) Sinking a mine shaft has never been hard to explain. You lower a crew to the bottom of a hole, they drill into the rock, pack the holes with explosives, ride a bucket back to the surface, blast, then head…...
A 464-ton German machine named Caroline is grinding through chalk 135 feet under the Thames, and scattered through that chalk are flint nodules harder than the concrete rings she bolts up behind herself, some of them at 145,000 psi
4+ week, 1+ day ago (852+ words) Anyone who has ever pushed a long drill bit through a fence post knows the problem. The deeper the hole gets, the more the bit wants to wander off line. Under the Thames, where a 464-metric-ton machine named Caroline is…...
A 4,350-ton boring machine that bends at the waist launched 147 feet under a suburban cricket ground in Sydney this week, and it changes its own worn cutting teeth without sending anyone into the head
4+ week, 1+ day ago (769+ words) Tunnel boring machines are built around one idea that has held for decades: make the machine a rigid steel cylinder, aim it carefully, and push. Stiffness is what keeps a cutting face honest when it is chewing rock at full…...