Aerial ropeways of Nepal
Practical Action
Support and control wire rope
Specifications
- 6x7 strand steel core F 10-12mm wire rope for support cable
- 6x7 strand jute core F 8-10mm wire rope for control cable
- The factor of safety should be at least 3 or more
T = ((( 2 * W + w * L + Ww * L ) * l) / (8 * b)) / Cosß where,
T = Total load on the cable
W = Weight of loaded trolley (kg)
Ww = Wind load factor (kg/m2)
w = specific weight of wire rope (kg/m2)
ß = cable inclination with saddle point
L = l [ 1 + 0.5 * { (h / l)² } + 8/3 * { ( b / l )² } ] + Lb
b = l*h / (8*e-4*l)
where,
L = Total length of the wire rope
b = Sagging at mid-way from highest point
e = Lowest point horizontal distance from highest point
l = Horizontal distance
h = Vertical distance
Lb = Backstay length at up station and down station
Functions and components of the gravity ropeway
Top-station control pulley
The top-station control pulley is used to control and guide the control wire rope at the top-
station. It is supported at the end by two bearings, and the housing is fixed rigidly on the base
frame of the platform.
Down-station control pulley and fly wheel
The down-station control pulley and fly wheel are used to control and guide the control wire
rope at the down-station. They are supported at the end with two bearings, and the housing is
fixed rigidly on the base frame of the platform. The fly wheel ensures smooth motion along
the wire rope.
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