Analysis of Ramp Requirements between AS1428.1-2009 & AS1428.1-2021
The ramp requirements across the two versions of AS 1428.1 standards—2009 and 2021—are broadly similar but with some key refinements in the latest 2021 update. Below is a structured comparison and analysis of the requirements for ramps in both versions.
1. General Ramp Requirements (Both Versions)
- Maximum Gradient: 1 in 14 for ramps exceeding 1900 mm in length.
- Gradient Consistency: The gradient must be constant throughout the length, with a maximum allowable tolerance of 3%, ensuring no section is steeper than 1 in 14.
- Landings:
- Must be provided at the top and bottom of ramps.
- Intermediate landings required at specified intervals depending on the gradient.
2. Differences Between AS 1428.1-2009 and AS 1428.1-2021
A. Landing Intervals and Dimensions
| Feature | AS 1428.1-2009 | AS 1428.1-2021 | Key Differences |
|---|---|---|---|
| Landing Intervals for Ramps | – 9 m for 1 in 14 ramps – 15 m for steeper than 1 in 20 ramps – Interpolation for gradients in between | – Same as 2009 standard | No changes in landing intervalsAS 1428.1-2009AS 1428.1-2021. |
| Landing Size (No Direction Change) | 1200 mm min. | 1200 mm min. | No change. |
| Landing Size (90° Turn) | 1500 mm x 1500 mm, truncated if necessary | Same as 2009, but clarification added on truncation | Small clarification in 2021 on truncation rulesAS 1428.1-2021. |
| Landing Size (180° Turn) | Required dimensions provided | Same as 2009 | No changeAS 1428.1-2021. |
B. Handrail and Kerb Requirements
| Feature | AS 1428.1-2009 | AS 1428.1-2021 | Key Differences |
|---|---|---|---|
| Handrails on Ramps | Required on both sides of ramps | Same as 2009 but more details on extensions | Clarified handrail extension requirements at landingsAS 1428.1-2021. |
| Kerb and Kerb Rails | – Kerbs: Min. height of 65 mm– Positioning rules for kerb rails | – Same min. height but added kerb rail placement rules | The 2021 standard clarifies kerb placement, ensuring handrails do not interfereAS 1428.1-2021. |
C. Step Ramps and Kerb Ramps
| Feature | AS 1428.1-2009 | AS 1428.1-2021 | Key Differences |
|---|---|---|---|
| Step Ramps | – Max 190 mm rise – Max 1900 mm length – Gradient not steeper than 1 in 10 | Same as 2009, but added clarifications on transitions | More details on sharp transitions at top and bottom in 2021AS 1428.1-2021. |
| Kerb Ramps | – Max rise: 190 mm – Max length: 1520 mm – Max gradient: 1 in 8 | Same limits as 2009, but added clarifications on alignment | Emphasis on alignment with pedestrian crossings in 2021AS 1428.1-2021. |
D. Additional Updates in AS 1428.1-2021
- Threshold Ramps: Added specific edge transition requirements to prevent trippingAS 1428.1-2021.
- Clarifications on Curved Ramps: Ensured consistent crossfall direction and minimum width of 1500 mmAS 1428.1-2021.
Conclusion
While both standards share the same fundamental requirements, AS 1428.1-2021 provides more detailed clarifications and additional safety measures related to truncated landings, kerb rail positioning, and step ramp transitions. These refinements improve usability and compliance clarity without significantly altering core gradient and dimension requirements.
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