Spa bath on cantilevered concrete slab. Will it hold?

[t451]

Hello,

We want to place a hot tub on a reinforced concrete terrace that cantilevers on one side of a wall and serves as a roof for a storage room on the other side.

See picture! (The hatch seen on the wall will be closed up)

The hot tub supplier informs that it should be designed to support 600 kg/sqm over an area of 2.2 x 2.2 sqm. We plan to position the center of the hot tub directly over the wall.

I would like to keep the floating/cantilevered concrete slab without adding supports outside (if possible). However, I am considering widening the supporting wall (which will also be refurbished) both on the inside and outside.

I want to know if the concrete can hold this?

Any wise thoughts/opinions among you?

Thanks,
Tobias

P.S. I've also been trying to reach engineers for a long time now, but it's not the easiest. Everyone is busy with other things.

 

[Nybygge_vid_kusten]

Hi,

We want to place a spa bath on a reinforced concrete terrace that cantilevers on one side of a wall and serves as a roof for a storage room on the other side.

See picture! (The hatch seen on the wall will be closed)

The spa bath supplier advises that you should design for 600 kg/sqm over an area of 2.2 x 2.2 sqm. We are planning to place the center of the spa bath right over the wall.

I would like to keep the floating/cantilevered concrete plane without adding support outside (if possible). However, I am considering widening the supporting wall (which also needs to be tidied up) both on the inside and outside.

I want to know if the concrete will hold for this?
Are there any wise thoughts/opinions among you?

Thank you,
Tobias

Ps. I have also been trying to get in touch with constructors for a long time now, but it is not the easiest. Everyone is busy with other things.

How is the floor slab reinforced? Thickness? Wall below (dimension and type)? Length of the cantilevered part? How far to the next supporting wall?
The additional weight is therefore just under 3 tons. The compressive strength is higher than 2 MPa, which corresponds to 200 tons per sqm. A 2m wall at 20cm should then allow the wall to handle more than 80 tons on 2 running meters of wall. A 25 cm thick floor slab provides a weight of about 0.6 tons per sqm (thus approximately the same load as the spa bath). It is hard to imagine that the wall would not handle it. Intuitively, I would have guessed that the floor slab also handles it, but there it would be good to calculate it.

 

[t451]

Thanks for the response!

You are probably right...
But we will reinforce the construction with a bunch of metal braces/pillars. Better safe than sorry.

Best regards,
Tobias