How can I make a bollard to block cars from a bike lane? (lemmy.world)

submitted 2 years ago by BothsidesistFraud@lemmy.world to c/unethicallifeprotips@lemmy.world

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requirements:

quick to erect
cheap materials
hard to move

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[-] bruhbeans@lemmy.ml 7 points 2 years ago

Get a cheap plastic form- a large plastic plant pot would work well. Line with tinfoil or plastic wrap. Cut a large hole in the bottom of the pot and the tinfoil. Turn it upside down in the spot you want the bollard. Fill with quick-set concrete. When the concrete is set, take the pot with you so you can make more, the foil should keep it from sticking. If you can work out a way to get some metal wire into the concrete form before you pour, it'll be much stronger.

Downsides to this could be getting enough concrete and water to the site- shit is heavy. Also, while it should be set in an hour or two, getting knocked by a car right away might kill it.

[-] BothsidesistFraud@lemmy.world 5 points 2 years ago

I looked it up and an 80 pound bag of concrete needs about 3L of water. That all seems doable.

Anyone know how long it would take to set?

[-] bruhbeans@lemmy.ml 4 points 2 years ago

I would expect it to be set enough that you could remove the form after a half hour to an hour

[-] wyrmroot@programming.dev 4 points 2 years ago

Make sure you get fast-setting concrete. It’s the difference between the time being about an hour vs about a day.

this post was submitted on 16 Jan 2025

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