pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER NO. PA-115<br />
(Page 12 0)<br />
of a front and rear 30" diameter rail wheel and axle assembly<br />
from which the carriage's steel framed platform is hung. The<br />
distance between front and rear wheels is 28'-0". The platform<br />
is 9'-6" wide x 37'-9" long x 2'-0" deep. Along the centerline<br />
of the platform, located approximately 7 , -0" from its west end<br />
and 2 ! -6" from its east end are each of the trolley's two Crocker<br />
Wheeler 75 hp travel motors running at 475 rpm with accompanying<br />
Falk gear drives and Cutler Hammer brake assemblies. Set between<br />
the travel motors are two Crocker Wheeler 200 hp hoist motors<br />
running at 380 rpm with their accompanying Falk gear drive and<br />
36" diameter winch drum assemblies. A 1 1/8" diameter rope,<br />
wrapped around each of the winch drums, is connected to a 15-ton<br />
Blaw Knox bucket scoop. The bucket is capable of traveling<br />
horizontally for a distance of 279*-o" at a maximum trolley speed<br />
of 600 feet per minute. The hoisting speed of the motor, drive,<br />
and winch drum assembly is 200 feet per minute.<br />
2. Repair Hoist: The repair hoist for the equipment on the<br />
man trolley is located on a monorail which is riveted to the<br />
underside of the structural steel bracing at the top chords of<br />
the bridge span, 24*-0" above the trolley's platform. Attached<br />
to the monorail, which runs the entire length of the span, is a<br />
Wright-Speedway hoist crane with a capacity of 15,000 pounds.<br />
3. Control House and Operators Cab: A 15'-0" wide x 16'-0"<br />
long x 10'-0" high control house is suspended from the western<br />
end of the trolley carriage. It sits on a platform which is<br />
suspended from the northern and southern side of the trolley<br />
platform. The steel framed sheet steel exterior building houses<br />
electrical switch gear. The 6'-6" wide x 7'-2 M long x 7'-ll"<br />
high sheet steel exterior operator's cab for the man trolley is<br />
hung from the control house about the centerline of the bridge<br />
span. It sits on the eastern edge of a 12 f -6" wide x 14'-0"<br />
platform which is hung from the control house platform.<br />
4. Trolley Walkway: Made of steel grating, the 4 ! -0" wide<br />
walkway is wedged between and welded to the bottom chords of the<br />
bridge span and the trolley rail chords on all four sides of the<br />
structure.<br />
5. Trolley Rail Buffer Assembly: The trolley buffer<br />
assembly consists of a 30" diameter hydraulic cylinder equipped<br />
with a piston rod capable of delivering a 3*-8" stroke which is<br />
mechanically connected to stoppers at each corner of the trolley<br />
runway. Each buffer assembly, which carries an estimated<br />
capacity of 15 gallons of Gulf # 501 oil, is designed to absorb<br />
the shock of the trolley as its reaches the end of its run.<br />
6. Dumper: The dumper is composed of a 50-ton hopper