pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 121)<br />
equipped with a heater and power operated gates. It is located<br />
on a 30 ( -0" square platform attached to the ore bridge on its<br />
eastern end by a steel framework extending downward from the top<br />
chord of the bridge span. The dumper, which delivers ore to the<br />
stockhouse bins, is centered over the ore bins along the trestle<br />
as it travels the length of the ore yard.<br />
7. Anemometer Platform and Frame: The anemometer platform<br />
is approximately 7 , -0" wide. It spans the northern and southern<br />
top chords of the bridge span approximately 75'-0" from its pier<br />
leg end. At the center of the platform are two 4'-0" high<br />
triangular frames made up of steel bars which are spaced 10'-0"<br />
apart about the centerline of the span. The frames were used to<br />
support an anemometer which measured wind force and speed.<br />
8. Ore Bridge Stairwells and Landings: Steel framed<br />
stairwells and landings leading from the ground to the top of the<br />
ore bridge span are located at the pier leg and shear leg ends of<br />
the bridge.<br />
B. Ore Bridge Number Four: Ore bridge number four was<br />
designed and built by the American Bridge Company in 1962. It is<br />
located south of ore bridge number three and laid out on a east-<br />
west axis across the ore yard. Made out of riveted steel<br />
construction, it consists of a set of pier and shear legs which<br />
carry a 334'-3" long x 24'-0" wide Warren bridge span. The<br />
height of the span is 29'-0" from the western or pier leg end of<br />
the bridge for a distance of 108'-4 1/2" before becoming 26'-0"<br />
for its remaining length. The northern and southern members of<br />
the span's top and bottom chord are laid out on a east-west axis.<br />
The eastern and western members of the top and bottom chord are<br />
laid out on a north-south axis.<br />
The 80'-6 ,f high pier leg is a three dimensional V shaped<br />
structure made up of large steel column framing. The V shaped<br />
legs of the structure are located on the northern and southern<br />
side of the ore bridge at its western end. Each V leg rises at a<br />
60 degree angle from the structure's 60'-0" long bottom chord to<br />
its 34'-0 M long top chords. The top chords of the structure,<br />
spaced approximately 40'-0" apart, run on a north-south axis<br />
flush underneath the northern and southern members of the span's<br />
top chord. The bottom chord of the structure runs on a north -<br />
south axis just above the 8-wheel pier trucks. A pair of 10 1/4"<br />
diameter clevis connections are hung, one each, from the eastern<br />
and western side of the bottom chord at both of its ends. The<br />
centerline of the clevis connections coincide with the centerline<br />
of the pier trucks. The two approximately 40'-0" long x S'-O"<br />
wide x 8'-0" high 8-wheel trucks are constructed of four linearly<br />
designed sets of two steel rail wheels, laid out on a north -