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Fall arresters tested for mechanical and ergonomics criteria - CSA Z259.2.1 -1998 standard

Arteau, Jean. 2012. « Fall arresters tested for mechanical and ergonomics criteria - CSA Z259.2.1 -1998 standard ». In Frühjahrskongress 2012 der Gesellschaft für Arbeitswissenschaft GfA (Kassel, Germany, Feb. 22-24, 2012), p. 157-164. Dortmund : GfA-Press.

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Résumé

When working at heights, fall protection is required; protection is either provided by a fall prevention system or a fall arrest system. The individual fall arrest system is made of a full body harness, an energy absorber, a lanyard, a connecting subsystem and an anchor. The connecting subsystem is often a fall arrester on a vertical flexible lifeline. A fall arrester is a device that slides along the vertical lifeline (rope) but locks on the rope if a fall occurs; the locking mechanism is done by a cam lever to which a lanyard is connected. Because the fall arrester is moving up and down and its stopping is done by the cam lever squeezing of the rope, the compatibility of the fall arrester and the vertical rope is a key element. A poorly designed fall arrester or an incompatible fall arrester/rope makes the fall arrester not moving easily on rope. In this situation, the user maintains the cam lever in an upward position in order to move it up and down when climbing. If a fall occurs during this operation, the natural reflex is to grasp what is in the hand, here the cam lever of the fall arrester; this action maintains the cam in an up position and makes it not functioning. The fall arrester is overridden and the fall is not arrested. Two well documented fatal accidents and several incidents had demonstrated this scenario. The CSA Z259.2.1-1998 standard includes mechanical strength and ergonomics criteria and the related test methods, the mobility test the panic grab test. Since then fall arresters do not interfere with the task and are fail-safe.

Type de document: Compte rendu de conférence
Professeur:
Professeur
Arteau, Jean
Affiliation: Génie mécanique
Date de dépôt: 10 juin 2016 16:28
Dernière modification: 20 avr. 2017 13:22
URI: http://espace2.etsmtl.ca/id/eprint/12766

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