October 29, 2005: Chipping away at the Pearman roadway
There is an interesting challenge with removing the Pearman roadway. Initially
the plan was to use the jack hammer to drop segments of roadway into the water
and then later removed. However Bob McCabe
and his team worked out a clever
alternative. Instead of hammering all the roadway, only lines of roadway
the steel girders are hammered, thus exposing the embedded rebar. Then
a perpendicular line is hammered from one side of the roadway to
the other, thus outlining a 1/4th width bite of roadway.
The shear then cuts the rebar, lifts the segment up and then pushes it to the
recycling pile. The end result is that only a very small fraction of the
roadway falls into the water below - thus avoiding a large water recovery
operation and minimizing environmental insults.
Here, the morning sun lights up the Ravenel Bridge and the Pearman worksite
The is the setup as viewed from the Grace Bridge - the shear is beind
the hammer which is drawing lines along the girder tops thus
exposing the rebar for a segment of roadway. You can see Roy Delpriete
hammering the roadway, sort of drawing a map for Kevin (in the shear behind)
Here is a closer view of Roy is hammering a line along the girder,
exposing the embedded rebar.
Beginning a line along the edge girder -
and then broadening the line, equal to the girder width.
Note the exposed rebar to be cut by Kevin's shear.
Next, exchanging the hammer for the scissors
and then some rebar cutting
Here is Kevin Atkinson lifting a segment
then rotating it upward
then pushing it toward the recycle pile
And here you can see the parallel girders and to the left, the gap left from
the just removed 1/4th bite of roadway.
Meanwhile, Mickey Roger's guys are continuing to drill holes in the
at the pier cap
A closer view
And toward Drum Island, nothing remains of Charleston's Stonehenge of
Pearman support piers