Boston big dig tunnel collapse
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Boston Big Dig Tunnel Collapse. By Reina Lipscomb. Overview. On July 10, 2006, the ceiling of the Interstate 90 tunnel collapsed, killing a woman. The tunnel was part of a $14.6 billion reconstruction project.

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Boston Big Dig Tunnel Collapse

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Boston big dig tunnel collapse

Boston Big Dig Tunnel Collapse

By Reina Lipscomb


Overview

Overview

On July 10, 2006, the ceiling of the Interstate 90 tunnel collapsed, killing a woman.

The tunnel was part of a $14.6 billion reconstruction project.

There had been numerous problems with the construction project in the past, including a massive leak in the tunnel wall and cost overruns.


Contributing factors

Contributing Factors

A large factor in the collapse of the tunnel was the materials used to build it. Bolts used in the structure were too short and the epoxy used to glue the bolts to the concrete was not up to standard.

Unethical behavior was displayed by the contracting company, Modern Continental. False statements were made, and phony time and materials slips were submitted for this project, preventing inspectors from knowing that there were issues with the design.

The non-regulation supplies used in this project left the structure weaker than intended in the design. The weak supplies could not bear the weight of the concrete and collapsed.


Impact

Impact

Modern Continental was charged fines of about $20 million for the construction error.

One person was killed and one was injured.

The tunnel was closed for almost a year.


Prevention

Prevention

Inspectors could check construction sites at planned intervals to ensure that the materials being used are up to standard.

A final inspection could be done before the constructed system is used by the public.

A list of specified materials and material strengths could be given to suppliers to ensure the strength of the supplies is up to standard.


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