Changing the face of Charleston : The unbuilding of the Grace and Pearman Bridges
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Blog: 2006
The story of building the Ravenel Bridge
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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)

February 2, 2006: The joys of early morning
Loading D-24 with Mickey and his ABS team

Sunrise and unbuilding

During the building of the Ravenel bridge I discovered that between December and late February, the sun is sufficiently south that the early morning light reflects gold off the Ravenel edge girders

Joe Duffy and his phone + Mickey and his coffee

I just can't get enought of the early morning golden sun

Mickey's team

with the Pearman and Grace skeletons in the background

and on our way to the worksite - more golden Ravenel Bridge

and early morning reflections

It all starts with a hole - top (left) and bottom (right) 36' deep that will be loaded with explosives and gravel. (Sometime, try to focus on the bottom of a 36 ft hole.)

The ABS team has been drilling using a John Henry (right) with a 4" cross-bit and a smaller drill (left)

I met John Henry - a drill on steroids mounted on an excavator

Meet John Henry

The drill that avoids steriods

Looking toward Mt. Pleasant - the drilling site with early morning continuing its elegant beginning

Sparky caught a nice shot of what is happening

Ken, Mickey and Brett laying out what I refer to as the ignition system but these red and yellow tubes are known as shock tubes developed in Sweden in 1967.. Shock tubes are long small plastic tubes that are coated with a thin film of explosive material. When ignited at one end, the shock wave generated by the explosive material travels about about 2000 m/sec or about 1 mile/sec. Delays can be incorporated into the shock tube system in order to control the detonation sequence.

Loading the first hole - Mickey holding the shock tube:
A nice image of "who's boss today, Mickey (right) or Ken (left). Brett, kneeling, knows that it doesn't matter - and I smile.

After Ken measures the depth of the hole Mickey is ready to drop a dynamite cylinder into the hole

down it goes

then pouring in some gravel between loads

Ken makes another measurement

down goes the next charge

Mickey with the iginition line

more loading and filling

Mickey tamping the explosives and gravel

Next Mickey ties in the shock tubes which establishe the detonation sequence. Today, the ignition will start at each end (north and south) and move inward toward the center. See the single frame video images: for visual confirmation

a closer look at tieing the lines together

then connecting the primary line that will link the north and south ends

Sparky captured me as I was learning from Mickey about how he ties in the sequencing lines

and me photographing Mickey during the tie-in

With the sequencing down, the little Testa that could (Brutus) picks us up and takes us to our photo spot

Next watch the ignition and results: ignition

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Attribution: C. Frank Starmer and Sparky Witte from