Looking NE from approach to Clark Bridge.
<p>Pouring last section (SW corner) of top floor of Witherspoon Street parking garage. This is an example of a <a rel="nofollow" class="external text" href="http://www.concreteconstruction.net/how-to/construction/post-tensioned-slabs_o">post-tensioned slab</a>.
Schwing 1200/32 <a href="https://en.wikipedia.org/wiki/concrete_pump" class="extiw" title="w:concrete pump">concrete pump</a>, fed by <a href="https://en.wikipedia.org/wiki/Concrete_mixer" class="extiw" title="w:Concrete mixer">concrete truck</a>, is used to pump <a href="https://en.wikipedia.org/wiki/concrete" class="extiw" title="w:concrete">concrete</a> up to work site.
At far right, man in plaid shirt controls position of placing boom and rate of concrete flow via remote box connected by cable to concrete pump.
One worker uses vibrating rod to remove embedded air pockets; others use 2x4s and shovels to smooth surface of fresh concrete.
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<a rel="nofollow" class="external text" href="http://www.concretepumpingdepot.com/productdetail.php?UniqueID=753&amp;imgsel=pic1url">Schwing 1200/32</a> ["32" refers to 32-meter vertical reach of placing boom] is discontinued; current version is <a rel="nofollow" class="external text" href="http://schwing.com/products/s32x/">S 32 S</a> .
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Louisville, Kentucky.
April 1988.
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file # 88d102.
35 mm Kodachrome.
Plustek OpticFilm 7600i.
Siverfast 8.
Picture Window 6.
unsharp mask (radius 1,threshold 3, 100%).
</p>
JPEG quality 95.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/29539021036/">88d102: Pouring top floor of Witherspoon Street garage with Schwing concrete pump</a>