Help with steel ordering

[Adam-andrew]

Hello, I am ready to order steel for my building project. Its an open plan extension.
I have had the steels specified by an engineer but just want be clear of what to order.
The opening is in a 1930s semi detached house (solid 9 inch wall) and is approx 7.5 metres with 2 point loads.
The engineer has given me 2 options for the main beam:
1) use 254 x 254 x 167kg
(This option is not practical as due to the overall weight and would need crane to lift off flat bed and into position)

2) use 2no x 203 x 203 x 113kg - I am going to go for this option.

The steel will sit on goalpost support columns at each end
203 x 203 x 46 UC on
250 x250 x 8mm Base plate
With 250 x 250 x 20mm head and sole plates

My question is - Do I need 2 goalposts at each end or just 1 with a bigger head plate to match the total width of the 2 steels bolted together (16 inch)

Thanks

 

[Murdochcat]

Should you not be running this past your BCO rather than faceless people on the Webb?

 

[Notch7]

(This option is not practical as due to the overall weight and would need crane to lift off flat bed and into position)

2) use 2no x 203 x 203 x 113kg - I am going to go for this option

Won’t you still need a crane?

7.5 x 113kg is still getting on for a tonne

My question is - Do I need 2 goalposts at each end or just 1 with a bigger head plate to match the total width of the 2 steels bolted together (16 inch)

S/E should have included a sectional dwg to show the connections.

You might get somebody on here to advice but you will need it in writing from your S/E as that is what the inspector will check against to confirm compliance

 

[Adam-andrew]

I think the lesser weight steels are more manageable off flatbed and onto rollers.
We would then use genies to lift into position.

Drawings from the SE show detailed cleat connections an splices but not for the head / sole plates.
SE spec has 250 x 250 head / sole plates.
Every job is different but I just wanted to know what how its typically done in this situation where there is 2 beams bolted together as the crossbar......and is it just a case of getting bigger head plated welded onto the goalposts.

 

[robinbanks]

We would then use genies to lift into position

Nuts to that; the genies for reasonable hire round my way top out at 450kg..
I think I'd be using a forklift. Or drilling a hole in each end and bolting a chain to it so I could lift it with an excavator, one end at a time. Or building a scaffold tower and using a properly rated block and tackle..

..but it's your life! Be careful

is it just a case of getting bigger head plated welded onto the goalposts.

That should be part of what the SE has specified, as should the columns

 

[noseall]

Nuts to that; the genies for reasonable hire round my way top out at 450kg..
I think I'd be using a forklift. Or drilling a hole in each end and bolting a chain to it so I could lift it with an excavator, one end at a time. Or building a scaffold tower and using a properly rated block and tackle..

Lifting them is one thing. But they also need to be wheeled a short distance, into position. We always use a pair of genies, i.e. one at each end.

 

[Adam-andrew]

The spec for columns

Column: Support Columns
Unfactored/factored load = 172/241 kN
Section: 203 x 203 x 46 UC Grade S355 on 250 x 250 x 8mm base plate
Sum of stress ratios = 0.163 OK
Use 203 x 203 x 46 Kg Universal Column Sections bolted back to brick returns at 500 ctrs with M20 bolts and
resin anchors . With 250 x 250 x 20 mm Head and sole plates. Welded on site at the head and bolted to new
1000 x 1000 x 600 concrete pads foundation with minimum 4nr 250 mm long x 20 mm dia bolts and resin
anchors..

No drawing on those connections.
I will ask the se next week

 

[noseall]

The spec for columns

Column: Support Columns
Unfactored/factored load = 172/241 kN
Section: 203 x 203 x 46 UC Grade S355 on 250 x 250 x 8mm base plate
Sum of stress ratios = 0.163 OK
Use 203 x 203 x 46 Kg Universal Column Sections bolted back to brick returns at 500 ctrs with M20 bolts and
resin anchors . With 250 x 250 x 20 mm Head and sole plates. Welded on site at the head and bolted to new
1000 x 1000 x 600 concrete pads foundation with minimum 4nr 250 mm long x 20 mm dia bolts and resin
anchors..

No drawing on those connections.
I will ask the se next week

"...250mm x 250mm x 20mm head plate...to be welded on site...."

I wonder if that means one column plus a (very thick) header plate?

 

[Adam-andrew]

Thats how I think it is. But I'm thinking the plate would need to be wider to match the overall width of the 2 steels bolted together at 406mm