Mild Steel Access Ladders - AAI Type AA720
Mild Steel Access Ladders
AA720 Mild Steel Access ladders are designed for access to platforms and structures where use of a stair is not suitable.
Ladders are 380mm min between stringers, complete with rungs at 300 max ctrs.
For the AA720 ladder type, the stringers are opened out to 700mm to a walk-through and is complete with a three rung step section. For ease of transport / installation, ladders can be spliced.
Ladders are secured with stays at generally 2500 ctrs, although this may increase if larger stringer sections are used.
Safety cages or fall arrest systems are an essential requirement for ladders where a user could fall 3m or more or come into contact with dangerous equipment.
Safety cages should start 2400mm from FFL and have hoops in line with the handrail ctrs to the head and 900mm max spacing there-after.
Inclined ladders should be set at 75 ̊ or steeper.
Landings where required should not be less than 840mm square complete with handrails and toe plates to protect open sides.
Material: Mild steel grade S275-JR
Ladders stringers and walk-through: Generally 65x13 flat bar minimum, c/w 20mm dia solid serrated rungs. Stringers can be manufactured from larger flat bar or angle sections, if fixing ctrs are limited.
Safety Cage, (hoops & straps): 50x8 flat bar.
Note: Safety chains should be provided to ladders with walk-through's, to guard against falls.
All xox fixings are galvanised / bzp, anchors to concrete will be as specified.
Finish: Galvanised to BS EN ISO1461.