Civil Engineering Reference
In-Depth Information
Table 1.6 Overview of the wire rope classes
Round ropes
Spiral rope
Open spiral rope (strand with round wires)
Half-locked coil rope
Full-locked coil rope
Stranded rope (round strands)
Single-layer rope (one layer of strands)
Multi-strand rope (several layers of strands)
Shaped strand rope
Triangular strand rope
Oval strand rope
Cable-laid rope
Round stranded ropes around a core
Braided rope
Round strands interlaced or plaited together
Flat rope
Four strand ropes stitched or riveted together
open spiral ropes
half-locked coil rope
full-locked coil rope
Fig. 1.31
Spiral ropes
full-locked coil rope always have a centre made of round wires. The half-locked
coil rope has an outer layer of half-locked (H-shaped) wires and round wires. The
full-locked coil rope has one or more outer layers of full-locked (Z-shaped) wires.
Half-locked coil ropes and full-locked coil ropes have the advantage that their
construction prevents the penetration of dirt and water to a greater extent and it
also protects them from loss of lubricant. In addition, they have one further very
important advantage as the ends of a broken outer wire cannot leave the rope if it
has the proper dimensions.
Open spiral ropes are mainly used as stay ropes in simpler uses. Half-locked
coil ropes are not often used. Full-locked coil ropes are installed in bridges and
important steel constructions. They are also used as track ropes for aerial rope
ways and cable cranes.
Stranded ropes. Stranded ropes are an assembly of several strands laid helically in
one or more layers around a core. Most types of stranded ropes only have one
strand layer over the core. The lay direction of the strands in the rope can be right
(symbol Z) or left (symbol S) and the lay direction of the wires can be right
(symbol z) or left (symbol s). This kind of rope is called ordinary lay rope if the lay
direction of the wires in the outer strands is in the opposite direction to the lay of
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