Quote:
Originally Posted by CoryB
The bollards are surprisingly a lot bigger project than they seem. Maybe it is just me not knowing what was involved but they seemed to dig 6-10 feet below street level and then build a giant steel grid connecting the up all the steel tubes that make the bollards. The inside on the bollard columns was then filed with concrete and if I remember correctly the steel grid was also incased in concrete before it was covered over.
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Those are proper bollards to actually stop a vehicle. Reinforced concrete.
Rule of thumb for structural things, such as sheet pile walls and I guess bollards. Is 2/3 below grade, 1/3 above grade. This is a vertical cantilever. Where if something hits the top 1/3, the bottom 2/3 are held in place by the earth.
Bollards that are at McDonalds or at large overhead doors, are mostly above ground and just there to prevent you from hitting the corner of the building.