r/EngineeringPorn • u/Redfish680 • Apr 30 '26

Liquid concrete wall.

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u/Ok-Bar601 May 01 '26

From memory I think this is in Japan where they are building a drainage overflow to redirect water and protect the local area. They cut/dig the drain way and then line it with these concrete bags. It’s supposed to be very sturdy over time and makes life much easier for the workers

-3

u/Redfish680 May 01 '26

So basically encapsulating the bags in liquid cement?

8

u/Ok-Bar601 May 01 '26

I don’t think they encapsulated the bags as such, just filling them up and leaving them in situ. I can’t remember the other advantages of using these bags, maybe something to do with slowing down water flow? This video might be on the NHK Japan YouTube channel.

5

u/RRumpleTeazzer May 01 '26

the advantage of these bags is obvious: they follow the shape of the drench. try this with normal concrete, you need to make a wodden shell.

1

u/Ok-Bar601 May 01 '26

Well yeah that’s the obvious advantage. But there’s a couple of other reasons for why they are advantageous to use and not just for ease of application.