Whats the American word for an Acro Prop?

[brettmarl]

In the UK, we use adjustable steel shafts to take temporary load of beams etc.

They look like this picture shown below:

What the heck to Americans call these? (picture below)

I want to cut out a section of a floor joist to re-inforce it with another joist and my contractor wants to go to all the time and expense to build a temporary wall from lumber.

It seems greener, faster and cheaper to simply throw and acro prop under it and call it good.

[libcarp]

I've always called them temporary columns, but I know a lot of people also call them floor jacks.

[Timothy Miller]

Howdy, reviewed your photo buthave never seen this type in USA. Here they are common as basment jacks. Available in solid pipe with a 6" screw adjustment lag.Sold in about 8 hieghts of pipe maz load 15,000lbs. Or two slip pipes that bolt together again about 8 sizes for hieght,again with only a screw adjustment of about6."
Looking at the photo I;d like to get some of your....

[ed21]

I call them screw jacks.
It's probably easier and greener(for his wallet) to just build a temp wall instead of buying a tool he doesn't want or thinks he needs.
Usually the means and methods a contractor uses to complete a task is up to him.

[Fencepost]

I've also heard them called "lally columns", though a quick Internet search suggest that the term should only apply to a concrete-filled, steel pipe column.

[NEC]

Always have known them as lally columns.

[JLMCDANIEL]

They are called jack posts, and excellent name.

By not really knowing the full situation "I want to cut out a section of a floor joist to re-inforce it with another joist and my contractor wants to go to all the time and expense to build a temporary wall from lumber." I would go with the contractor's suggestion, it's his liability and insurance that is involved.

Jack

[canuk]

Around here we call them screw jacks .... the picture NEC included we call teleposts.

Hard to say what the situation is but throwing up a temporary wall shouldn't take long or be expensive .... depends.

[brettmarl]

thanks for all the feedback and dictionary translations

[fjames2]

Can anyone tell me where I can buy these in the US? Please. Thank you.