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Swale Drain Bridges
A simple but effective low priced swale drain bridge is now available from Outdoor Structures Australia. The bridge is based on the member sizes and widths from our very successful Boardwalk Design Guide, with overall length in modules of 120mm. Stainless fasteners are an option.
| Model | Span | Overall | Width |
|---|---|---|---|
| SD2511 | 2.5 | 3.0 | 1.1 |
| SD2514 | (25 boards) | 1.4 | |
| SD2517 | 1.7 | ||
| SD2523 | 2.3 | ||
| SD2526 | 2.6 | ||
| SD3111 | 3.1 | 3.6 | 1.1 |
| SD3114 | (30 boards) | 1.4 | |
| SD3117 | 1.7 | ||
| SD3123 | 2.3 | ||
| SD3126 | 2.6 | ||
| SD4311 | 4.3 | 4.8 | 1.1 |
| SD4314 | (40 boards) | 1.4 | |
| SD4317 | 1.7 | ||
| SD4323 | 2.3 | ||
| SD4326 | 2.6 | ||
| SD4911 | 4.9 | 5.4 | 1.1 |
| SD4914 | (45 boards) | 1.4 | |
| SD4917 | 1.7 | ||
| SD4923 | 2.3 | ||
| SD4926 | 2.6 | ||
| SD6111 | 6.1 | 6.6 | 1.1 |
| SD6114 | (55 boards) | 1.4 | |
| SD6117 | 1.7 | ||
| SD6123 | 2.3 | ||
| SD6126 | 2.6 | ||
| Span is centre/centre of hold downs, bridge is 0.5m longer | |||
For further information on this range of certified bridge superstructures contact Ted at Outdoor Structures Australia: email. We can also assist with abutment design.
This information is also available as a one page full-colour brochure:
Swale Drain Bridges
Close-up of Swale Drain Bridge hold down
Abutment Design Notes For Swale Drain Bridges
The abutment should be designed with the following in mind:
- The bridge should not be installed beyond a maximum 5% slope.
- The bridge sill should not sit directly on the abutment but be spaced up to 50mm above on drypack concrete or neoprene blocks.
- The abutment should have a concrete backwall and a side wall to stop soil encroaching on the timbers
- The abutment should slope about 25mm across its width to shed moisture
- Design reinforcing so there is no clash with the hold down bolt positions
- The bridge is only intended to withstand nominal flood loads
Figure 1 Avoid this outcome
NOTES:
If handrails are required use the demountable series bridge. Bikeway compliant rails are needed on virtually all bikeway bridges.
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Outdoor Structures Australia
Email: ted@outdoorstructures.com.au «» Phone: +61 (7) 5462 4255 «» Fax: +61 (7) 5462 4077
Postal: PO Box 517, Gatton Queensland 4343, Australia
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