Special screed under 3.5t column lift?

Hi,

honestly, I can’t imagine that you’ll be able to secure the lift platform in the screed at all. Screed is not made to bear serious loads. Also, a thickness of 70 mm won’t be enough to fix the anchors properly. In other words, you will have to go into the base slab with the anchors anyway.

Then the question arises whether the screed can withstand the compressive loads. Probably not with unreinforced flowing screed.

Alternatively, of course, you can set up the platform “floating,” meaning the load-bearing bolts go through the screed directly into the concrete and the lift platform is only screwed onto the bolts. It will then have a few millimeters of clearance from the floor, so it does not touch the “floor” at all. This is how industrial plants are installed to avoid problems with uneven floors. Your problem then is the screed thickness, which represents a free length of the bolts. This free length should be a maximum of 1-2 cm, which will be difficult with your screed.

In industrial halls, screed is not laid for good reason, but rather a thick base slab, which is then properly smoothed and sealed.



Regards,



Andreas

Our screed did not look particularly good even when installing the fireplace insert (weighing only a few hundred kilograms), despite using Styrodur instead of Syropur and recessing the underfloor heating in that area.

I would never want to place a lift platform on it. I mean: be glad instead: first screw the lift platform onto the bare concrete floor, then set it down and fill the screed around it. This way, for example, a more affordable lift platform with a lower connecting beam can be installed. This would then be level with the screed later poured around it and therefore easy to drive over.