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Challenge
Climbing in a Jerol pole must be as easy as climbing in a wooden pole.
Climbing must be safe in all weather conditions.
Problem identification
Standard safety line, without extra gripping equipment, can become slippery with the Jerol pole.
Blunt spikes and severe frost might result in poor grip for the climbing shoes.
Must have
Good grip on the Jerol pole
Firm bite onto the pole
Using standard approved climbers and safety equipment
The Jerol Gripper
Developed in co-operation with C2 Vertical Safety
Tested with a dummy in C2 Vertical Safety’s training and testing facilities
Tested at Björklinge Energi in field conditions
C2 Vertical Safety
Torbjörn Larsson, Safety Engineer,
Vattenfall Service Syd:
"C2 Vertical Safety is our main partner in
training, safety equipments and material
inspections. Together we have developed
the ”EBR-method” to resque climbers in
distress."
C2 Vertical Safety
Patrik Polgar, Training and Technical
Solutions Manager, C2 Vertical Safety:
“Since we don’t interfer with existing safety
equipment, but merely use the Jerol Gripper
to protect the safety strap, we will probably
not require additional approval for the
equipment”.
Test procedure at C2
A 70kg test dummy was set to hang from a rope mounted on the top of the Jerol pole.
A strap with a Jerol Gripper was then placed round the pole and hooked to the dummy’s standard safety line.
The supporting rope was then cut to produce a free fall of the dummy. The safety line had to carry the entire weight of the dummy.
Dummy set up
Test procedure and result
Prior to the test the position of the Jerol Gripper is marked.
After the test the distance between the Gripper and the mark is measured.
Result: The Jerol Gripper on the strap grabs within 1 cm.
Patrik Polgar: “The result is suprisingly good! The Jerol Gripper makes climbing in the composite pole safe regardless of weather conditions.”
Test with dummy
Field test
A field test to verify lab result was conducted by linemen
from utility company Björklinge Energi:
Weather conditions: Temperature -16⁰C with snowfall
The linemen found that the Jerol Gripper worked well
even in tough winter conditions