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)

March 27, 2006:
Around the dock

Today was a new composition for Cashman-Testa and continuo - realign one of the jackup barges's legs; transporting the Mammoet beams, preparing the Pearman for next week's blast and P-3, known now as Pain-in-the-Neck

Here is the dock worksite, one of the jackup barges legs

and transporting the top Mammoet beams

Sometimes things become misaligned and in this case, one of the jackup barge's legs needed a chiopractic adjustment. So a new section of tubing was welded into place and a rack added to each side. So the learning link for today is Rack and Pinion gearing - otherwise known as translating rotary motion into linear motion

Here is a view of one of the jackup barge's legs with a section replaced

The pinion that will be attached to the newly realigned tube

Here is the expert, Joe Perrier, who related that it took the several months to get the part from Germany, its place of manufacture

Sparky like looking inside things and here he is looking down the barrel that will hold the jackup leg. The pinions travel down the grooves on either side and on the right, you can see a tooth of the rack gear.

Another view of the jackup barge leg

Meanwhile, out at the Pearman, prep work continues for next weeks blast

Here making a cut to reduce the integrity of the truss structure

and in close quarters

Meanwhile, Michael is working away on P-3

Naming T-3 as tenacity of purpose seems realistic. But because of the high reach required to bring Grace down, I call this Pain-in-the-Neck

Look how much progress Michael has made - compare with the angle in the upper boom above with this one.

and the 1250 sleeping

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Attribution: C. Frank Starmer and Sparky Witte from