Update on Seattle’s stalled Big Bertha tunnel project
Link here. The news is not good. It appears that, after disassembling the giant drill’s front end, it has numerous engineering problems. Moreover, the cost keeps going up.
Tag: Bertha
Bertha is stuck under Seattle and the taxpayers are going to have to pay millions, if not billions, to get the giant drilling machine moving again.
Bertha is stuck under Seattle and the taxpayers might be required to pay millions, if not billions, to get the giant drilling machine moving again.
Failures like this do happen, but to me they seem to happen routinely to modern big government projects. I wonder why.
Engineers have finally pinpointed the problem, a damaged seal assembly, that has been stalling the giant drilling machine Bertha in Seattle.
Engineers have finally pinpointed the problem, a damaged seal assembly, that has been stalling the giant drilling machine Bertha in Seattle.
The drill machine is still under warranty, and engineers from its manufacturer are on the way to deal with the problem.
After resuming drilling in Seattle — and only going four feet — Bertha has been stopped again.
After resuming drilling in Seattle — and only going four feet — Bertha has been stopped again.
High temperatures near the machine’s cutting face prompted contractors to stop mining after the drill advanced a total of 4 feet in test runs Tuesday and Wednesday. And that ended Bertha’s attempt to resume mining after an eight-week layoff.
The earlier stoppage remains unexplained. They found some concrete chunks and steel pipe sections in the way, but nothing that could have explained why the drill was blocked. Now the high temperatures pose a more significant problem, as they suggest there is something technical wrong with the giant drill.
After drilling four shafts and sending in one man to look, engineers still don’t know what is blocking the giant tunnel drill Bertha in Seattle.
After drilling four shafts and sending in one man to look, engineers still don’t know what is blocking the giant tunnel drill Bertha in Seattle.
The next step, not simple, is to send workers to inspect the drill face itself.
Under Seattle Bertha has stopped drilling because something is in the way.
Under Seattle Bertha has stopped drilling because something is in the way.
Something unknown, engineers say — and all the more intriguing to many residents for being unknown — has blocked the progress of the biggest-diameter tunnel-boring machine in use on the planet, a high-tech, largely automated wonder called Bertha. At five stories high with a crew of 20, the cigar-shaped behemoth was grinding away underground on a two-mile-long, $3.1 billion highway tunnel under the city’s waterfront on Dec. 6 when it encountered something in its path that managers still simply refer to as “the object.”
The object’s composition and provenance remain unknown almost two weeks after first contact because in a state-of-the-art tunneling machine, as it turns out, you can’t exactly poke your head out the window and look.
Inside the world’s largest tunnel boring machine.
Inside the world’s largest tunnel boring machine (TBM).
“Bertha,” as it’s known, is the world’s largest TBM and will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city as part of a US$1.2 billion project to replace a viaduct damaged in a 2001 earthquake.