Changing the face of Charleston : The unbuilding of the Grace and Pearman Bridges
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Unbuilding Highlights
(Apr 10)
Meeting St. Stories
(Jul 10 2006)
East Bay Stories
(Oct 10 2006)
Drum Island Stories
(Feb 17)
Pearman Bridge Stories
(Apr 3)
Grace Bridge Stories
(Apr 3)
Imposions: Prep and boom
(Mar 27)
Unbuilding Bridge Blog
(July 23 2006)
Unbuilding Challenges
(Mar 13)
Learning Links
(Feb 20)
Unbuilding Stories
(Mar 13)
Video and Sounds
(Feb 28)

October 22, 2005:
Blast preparation and Roadway Removal

Mickey Rogers, the owner of Advanced Blasting Services, LLC. has the subcontract for dropping the concrete bridge supports. This morning, Mickey helped me understand the preparation process for dropping these supports. I had seen his team a month ago when they were preparing for a test blast (D6 column on Drum Island) but this was the first time to get some insights into the process.

Here is an overview of the work site. To the left, Testa is removing roadway segments from the Pearman while on the right, Mickey's team is busy drilling patterned holes in preparation for dropping the support.

Here you can see the ABS team drilling on the right. These 2" holes are 8 feet deep into the columns and have to miss the embedded rebar. Without being able to actually see where the rebar is, the job is a bit tedius as the hole must be moved and redrilled should they encounter rebar before reaching their 8 foot limit. In addition, when they reach the base, and after the initial blast, they will drill 4" holes vertically down (60 feet) into the foundation and then blast the foundation later.

Here is a closer view of the drilling team

Meanwhile, on the left, some more of Mickey's team are removing the scaffolding and preparing to drill this column

Each time I return from the Mt Pleasant side, I always like to check the Colemen Recycling Center. Note the height of the pile of rebar. Nice work.

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Attribution: C. Frank Starmer and Sparky Witte from