How much can a 70x70 withstand?

[Inte snickare]

Hello everyone.

I am going to fill in an old grease pit. I'm trying to figure out how much a 70x70 beam can support. My idea was to place beams with CC600 and sturdy (45x220) boards on top. The pit is wide, about 1500mm, with about 100mm on either side to support the construction. So the free span is about 1300mm. The question is, will it hold to drive a car over it? Or should the beams be placed at closer intervals?

The reason I want 70+45 is that from the floor to a ledge in the pit is about 115mm. And I don't want the longitudinal boards to be too weak and crack between the beams from the tires. But at the same time, I want sufficient load-bearing capacity in the beams.

I don't master "Nm per square inch over degrees in angle" as the strength theory tables show. I'm also not a professional carpenter, so please use simple English.

 

[Dilato]

You can support with a beam from the floor in the middle of the pit, then it will be approximately cc 70.

 

[Inte snickare]

You can support with a beam from the floor in the middle of the pit, then it will be around cc 70.

The idea is to use the space for storage. Then it won't be good to have supports. But yes, it is possible.

 

[Dan_Johansson]

Did you know that the pit keeps dry? Just a heads up, so you don't put things there that can't handle moisture and it turns out to be filled with water?

 

[Inte snickare]

Do you know that the pit stays dry? Just a heads up, so you don't place items that can't withstand moisture there and it turns out to be water-filled?

Yes indeed! It's dry as tinder!