#2805: SpanShield

Scotland and many other Northern countries have a real problem with their tall bridges.

Ice forms on the high structures and then falls on vehicles below. This has caused the new Queensferry bridge to close several times and caused a huge amount of costly disruption and embarrassment.

Here is the invention I propose. It’s not rocket science, or clever technology…it’s a roof.

I calculate that there would be a one-off charge of about £200k to provide the entire road area with a sloping, transparent roof made of eg acrylic sheet.

This would simply shed any ice or snow effectively into the Firth of Forth. It would require only low-level, rapid installation, minimal maintenance, could be designed to be aerodynamic, so that vibration and wind noise need not be a problem and would neither deface the bridge nor be oppressive to motorists.

I just received this response from Bear Scotland:

Unfortunately however, bridges are particularly susceptible to wind loading and as such, the increased loading from a canopy, could not be accommodated by the structure.

So we can be pretty clear that these guys won’t achieve a solution.

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