pa1778data.pdf

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U.S. STEEL DUQUESNE WORKS
HAER No. PA-115
(Page 12 3)
scoop. The bucket is capable of traveling horizontally for a
distance of 282 , -0" at a maximum speed of 765 feet per minute.
The speed of the hoist drive assembly is 3 00 feet per minute.
2. Repair Hoist: The 7 1/2-ton Wright-Speedway repair hoist
for the equipment on the man trolley hangs from a monorail which
is riveted to the underside of the structural steel bracing at
the top chords of the bridge span, approximately 24*-0" above the
trolley's platform. Running the entire length of the span, the
monorail is located on its centerline.
3. Control House and Operators Cab: A 13'-0" wide x 16'-0"
long x 10*-0" high control house is hung from the western end of
the trolley platform. It sits on a platform which is hung from
the northern and southern side of the trolley platform. The
steel framed sheet steel clad building houses electrical switch
gear. An approximately 6'-6" wide x 7'-0" long x S'-O" high
sheet steel clad man-trolley operator's cab is suspended from the
control house about the centerline of the bridge span. It sits
on a platform which is hung from the western end of the control
house platform.
4. Trolley Walkway: The 4'-0" wide trolley walkway, made of
steel grating, is wedged between, and welded to, the bottom
chords of the bridge span and the trolley rail chords on all four
sides of the structure.
5. Trolley Rail Buffer Assembly: Located at each corner of
the trolley runway, the trolley rail buffer assembly consists of
a 30" diameter hydraulic cylinder equipped with a piston rod,
capable of delivering a 72" stroke, which is mechanically
connected to runway stoppers. Each buffer assembly is designed
to absorb the shock of the trolley as it reaches the end of its
run.
6. Dumper: Composed of a 50-ton hopper which is equipped
with a heater and power operated gates, the dumper is located on
a cantilevered platform at the eastern end of the bridge. The
approximately 30'-0" square platform extends eastward from the
shear leg. The dumper, which drops ore into stockhouse bins
suspended from the trestle's steelwork, travels the length of the
ore yard.
7. Motor-Generator Control House: The approximately 15*-0"
wide x 30 f -0" long x 19 f -0" high steel framed motor-generator
control house has a corrugated metal exterior and gable roof. It
sits on a platform supported by the top chords of the bridge span
and is located directly over the top chords of the shear leg. A
motor-generator set is located on the floor of the building 7'-9"