Greenlee UT10 Ultra Tugger Manual De Instrucciones página 18

Cable Pulling Principles (cont'd)
Cable Pulling Forces (cont'd)
At the Sheaves
Sheaves are used to change the direction of the pull.
A change in direction creates a new resultant force
that may be greater than the cable puller's maximum
pulling force. This new resultant force exerts itself on the
sheaves, sheave anchoring system, and support struc-
tures illustrated.
The resultant amount of force depends on the angle of
the change in direction. A brief table is provided here;
For details on calculating the resultant force for any
angle, refer to IM 1363 (99929988).
Greenlee / A Textron Company
®
Ultra Tugger 10 Cable Puller and Pulling Packages
Resultant Force
27.4 kN (6160 lb)
Typical Resultant Force at Sheave
18
Resultant Force Table
(35.6 kN or 8,000 lb Pulling Force)
Angle of Change
Illustration
in Direction
135°
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Resultant Force
in kN (lb)
180° 0 (0)
150° 18.5 (4160)
135° 27.4 (6160)
120° 35.6 (8000)
90° 50.2 (11,300)
60° 61.6 (13,800)
45° 65.8 (14,800)
30° 68.7 (15,400)
0° 71.2 (16,000)