Boston – Inspectors began reviewing the city’s entire highway system Wednesday – every bridge, tunnel and roadway – after at least 60 signs of loose bolts and other potential failures were found in the same Big Dig tunnel where a motorist was crushed by falling concrete.
Initial inspections by state officials revealed that some bolts had started to come out of the concrete in the eastbound connector tunnel, part of the main route to Boston’s Logan Airport.
Gaps also had developed between the ceiling and metal plates that help hold the massive panels in place.
There had been plans to reopen that section of tunnel Wednesday, but Massachusetts Turnpike Chairman Matthew Amorello said it would remain closed indefinitely to ensure motorists’ safety and to collect more evidence in a possible criminal investigation of the tunnels’ designers and builders.
Amorello added that an undetermined number of similar problem areas were found in two adjacent tunnels, raising the possibility of a broader design or construction flaw.
The widespread trouble spots prompted the Turnpike Authority to order an inspection of the city’s entire highway system – even parts that are decades old and not part of the $14.6 billion Big Dig system, the nation’s most expensive highway project.
Still, Amorello insisted the tunnels remain safe.
“What happened Monday was a tragedy,” he said. “I’m taking every step to ensure it never happens again.”
Late Monday, 12 tons of concrete ceiling panels in the tunnel collapsed, crushing a car and killing 38-year-old Milena Del Valle. Her husband barely escaped by crawling through a window.
Attorney General Tom Reilly said a contractor and project manager knew about problems in that section of the tunnel as early as 1999, when five bolts failed during testing.
“It was not only identified, but there was a plan to address that problem, and what we’re trying to determine right now is was that plan implemented,” Reilly said, declining to provide any other details.
John Christian, an engineer hired to investigate for the Turnpike Authority, said the attachment bolts used a standard design: Holes were drilled into the tunnel’s concrete ceiling, and bolts were then inserted, along with pressure-injected epoxy.
Commuters waited years for the Big Dig to bury the city’s antiquated central artery and send traffic underneath downtown. But the accident has raised new questions about the project.
Scott Brook, an 41-year-old information technology consultant, uses one of the system’s main tunnels. On Wednesday, he found himself looking at the ceiling.
“I used to say that the Big Dig was the best thing to happen because it made my commute shorter, but I can’t say it’s such a great thing now,” he said.
