AS1428.1:2021- Bite size technical article 1 - Application of 1500mm clear width to Curved walkways and ramps
AS1428.1:2021 (Desing for Access and Mobility) Clause 7.4(f) Curved walkways, ramps and landings
The AS1428.1-2009 Clause 10.4 the following for curved walkways and landings requires:
- Gradients (as per Figure 20)
- Landings (as per Clause 10.8)
- Length of curved ramp to be measured along its centreline
- All curved ramps/ walkways to have a clear minimum width of 1500mm
- Any crossfalls to be towards the centre of curvature
The clause caused confusion in the following areas:
- What is the definition of a 'curved' walkway or ramp? Would say a gentle 20M radius walkway still be considered to be a ‘curve’ and require 1500mm clear width?
- What would the junction of a 1000mm straight walkway with a 1500mm curved walkway look like?
To clarify this the AS1428.1:2021 has been updated to state the following:
- The curved ramps are now defined as being maximum inside radius of 5M. Therefore, any curved ramps that have an internal radius of more than 5M need not provide a clear width of 1500mm but can remain a minimum of 1000mm.
- At the junction of a straight walkway / ramp and a curved walkway / ramp, a 1500mm long straight landing is required which:
- Intersects with each other along the centreline
- The change in width from 1000mm (straight component) to 1500mm (curved component) is to be accommodated within the length of the 1500mm long straight landing.
Stone path photo created by mrsiraphol- Freepik