Cable Yarding Methods TOPICS
Cable Yarding Methods TOPICS
Cable Yarding Methods TOPICS
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<strong>Cable</strong> <strong>Yarding</strong> <strong>Methods</strong><br />
<strong>TOPICS</strong><br />
•Equipment (yarder types)<br />
•<strong>Cable</strong> systems<br />
Highlead<br />
Skyline<br />
Standing (single-span or multispan)<br />
Live<br />
Running<br />
•Skyline y carriages g<br />
•Terminology, capabilities, limitations<br />
•Forest management applications
• Sled yarder<br />
Equipment Types<br />
• “Large” telescoping to tower er – trailer mount mo nt (steel spar)<br />
• “Small” – trailer mount tower<br />
• Self-propelled mobile yarder<br />
Carrier: rubber tire, track; truck or skidder mount<br />
- Swing boom<br />
- Tower (steel spar)<br />
• Snorkel – yarder/loader<br />
• Excavator forwarder with winches
Sled Yarder<br />
& Spar Tree
Sled Yarder
Large Telescoping Tower – Trailer Mount (Steel Spar)
Small – Trailer Mount Tower
Swing Boom Mobile Yarder
Mobile Yarder/Tower
Snorkel<br />
Yarder/Loader
Excavator-Forwarder with Winches<br />
“Yoader”
<strong>Cable</strong> Systems<br />
• Highlead<br />
Uses 2 operating lines; does not use a skyline or carriage<br />
• Skyline<br />
Standing (single span or multispan)<br />
The skyline length is fixed and the skyline does not raise or<br />
lower during the yarding cycle; a slackpulling carriage is<br />
needed<br />
Live<br />
The skyline is raised and lowered with each turn of logs;<br />
a non-slackpulling carriage is used<br />
Running<br />
Two lines support the load and these lines move<br />
in and out with the carriage; a slackpulling carriage<br />
is typically used; interlock yarding drums are<br />
typically used
Skyline Carriages<br />
SlackPulling Non-Slackpulling<br />
Manual Mechanical Choker Grapple<br />
Pulled by Carriage Pulled by Yarder
Yarder and Carriage Compatibility Factors<br />
• Proper number of yarding drums to operate carriage<br />
• Line size matches with carriage sheave diameters<br />
• Carriage weight is appropriate for cable system<br />
Approximately:<br />
Large towers: 22,000 000 – 66,000 000 lbs lbs.<br />
Mobile yarders: 1,000 – 4,000 lbs.<br />
Small towers: 300 – 1500 lbs
Terminology: Skyline Logging Crew Positions<br />
• Side Rod or supervisor of the logging<br />
operation p<br />
• Hooktender is the person responsible<br />
for cable road changes and helps with the<br />
supervision p<br />
• Rigging Slinger is the person that<br />
supervises the choker setting operation --selects<br />
logs g to be choked and sends radio<br />
signals to yarder operator<br />
• Choker Setters set the cables (or<br />
chokers) ) on the logs g<br />
• Chaser unhooks the logs at the roadside<br />
• Yarder Operator runs the yarder<br />
• Loader Operator runs the loader
T Terminology i l<br />
- Tail tree or Lift tree<br />
- Spar tree<br />
tree<br />
- Intermediate Support tree<br />
- Rigging Blocks<br />
Blocks<br />
- Support Jack<br />
- Skyline Carriage Sheave
T Terminology: i l Stawline St li or Haywire….. H i is i used d for f cable bl road d<br />
changes --- moving larger operating cables from one location to<br />
another location in the harvesting unit
Skyline Deflection
Soil Scarification and Disturbance<br />
from Logging<br />
• Log suspension during<br />
cable yarding<br />
– Ground lead<br />
– Partial suspension<br />
– Full suspension
U Uphill hill versus Downhill D hill <strong>Cable</strong> C bl <strong>Yarding</strong> Y di<br />
• <strong>Cable</strong> system requirements<br />
– HHaulback lb k cable bl ffor<br />
downhill<br />
– Gravity or haulback cable<br />
for uphill<br />
• Safety considerations<br />
• Soil erosion impacts<br />
• TTransportation t ti network<br />
t k
End of Introduction to <strong>Cable</strong> <strong>Yarding</strong><br />
Systems
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