" Falling concrete slabs crushed a car inside one of the city's troubled Big 
Dig tunnels, killing a woman and tying up traffic Tuesday with another 
shutdown in the massive building project that has become a central route through the 
city. The ceiling panels fell because a steel tieback, holding a 40-foot 
section of the ceiling in place, gave way, Amorello said.  "There was a snapping 
sound heard," Amorello said. "One of the tile panels from the roof released. It 
caused a series of panels to be released."  The ceiling panels were erected 
there in 1999 and the tiebacks were bolted to the tunnel roof overhead. Other 
parts of the system were the tiebacks are believed to have been used were being 
inspected."
I didn't realize we were anchoring big (looks like 10x20) concrete panels to 
the undersides of ceilings in high volume thoroughfares.  Is something wrong 
with this picture?  
Christopher 

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