Vijay Posted August 17, 2017 Share Posted August 17, 2017 I know this is probably a very stupid question but I'd rather ask. Is there any way a drainage pipe could go through the vertical part of a steel? I have a 3m 203x133x30UB steel that's in the way of a pipe run idea, that would get rid of a pipe in the corner of the dining room and move it to inside the W.C. It's not the end of the world if there's no way but I wondered if the steel could be beefed up to do it? Vijay Link to comment Share on other sites More sharing options...
Onoff Posted August 17, 2017 Share Posted August 17, 2017 I wonder if you could weld plates either side, themselves with 110mm holes in connecting the flanges? Thus replacing the "strength" you've taken out of the web... I've considered doing exactly what you're proposing to give me a soil run down the centre of the house. This for upstairs wcs and showers in all the bedrooms. I've an RSJ "in the way" that runs under the centre of the dormer. Link to comment Share on other sites More sharing options...
Vijay Posted August 17, 2017 Author Share Posted August 17, 2017 That's exactly what I was thinking I've already emailed my S.E to ask if there's any way Link to comment Share on other sites More sharing options...
Onoff Posted August 17, 2017 Share Posted August 17, 2017 A bit here: https://diy.stackexchange.com/questions/78526/is-a-toilet-drain-permitted-to-run-through-i-joists Are we getting into castellated beam territory here? A clever person will be along shortly! Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 17, 2017 Share Posted August 17, 2017 For larger penetrations through steel ( when working on cruise liners / oil tankers etc ) they used to weld a very thick walled pipe back into an oversized hole. That pipe section acted as a sleeve for the actual service. That was then over plated either side with the tube section adding a lot of the removed rigidity. Section of tube was about 100-150mm long iirc. I'd say it can be done, but the original steel may have had to have been specced to grade 3 at the design stage to permit it. Deffo an SE question as it'll be required for your paper trail and warranty anyway. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted August 17, 2017 Share Posted August 17, 2017 (edited) +1 defo the SE patch. It can be done but just how much and what form of beefing up will be required will depend on where in the length the hole is going and the load profile at that point. Remember it is not just the load but also the deflection, which can produce high stresses in gusset plates and their fixings and the fire rating needed because that will have to be at least as good as the plain beam. You also do not have much meat around the hole to run strengthening through (((203-110)-60)/2) mm each side. You may need top and bottom strengthening as well. I presume you don't yet have the steel so it could be fabricated off-site because doing it on site will be a specialist job of the first order. Edited August 17, 2017 by MikeSharp01 30 changed to 60 to allow for both top and bottom flanges Link to comment Share on other sites More sharing options...
PeterW Posted August 17, 2017 Share Posted August 17, 2017 (edited) Depends where you want to do it and what shape ..! It would breach the maximum of 0.5d for an unreinforced hole but could be made to work with a reinforced hole as long as it doesn't exceed 0.6d (d is the steel depth) and is not within 2d of the end of the steel. Round holes are limited to 0.5d in any web so based on your spec you would need to put a rectangular hole 120x180mm at a minimum of 406mm from the end of the steel support (i.e. Where it becomes unsupported) and as long as there are no point loads within 2d of the opening ..... Reinforcing and cutting would need to be done offsite and certified - this is not a job for a Starrett cutter and some angle iron ..!! Edited August 17, 2017 by PeterW Crossed with Mike ! Link to comment Share on other sites More sharing options...
Vijay Posted August 17, 2017 Author Share Posted August 17, 2017 No steels have been ordered yet, so it could be done offsite if it gets the go ahead Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 19, 2017 Share Posted August 19, 2017 On 17 August 2017 at 18:20, Vijay said: No steels have been ordered yet, so it could be done offsite if it gets the go ahead Happy days. Please update the thread as it'll be of interest I'm sure . Link to comment Share on other sites More sharing options...
bassanclan Posted August 19, 2017 Share Posted August 19, 2017 If you are at the design stage it makes sense to design out the need to go through the steel, rather than paying for SE calcs, complicated steelwork etc Link to comment Share on other sites More sharing options...
Onoff Posted August 19, 2017 Share Posted August 19, 2017 27 minutes ago, bassanclan said: If you are at the design stage it makes sense to design out the need to go through the steel, rather than paying for SE calcs, complicated steelwork etc Where's the FUN in that? Plus we want photos of his clever solution! Link to comment Share on other sites More sharing options...
PeterW Posted August 19, 2017 Share Posted August 19, 2017 2 hours ago, bassanclan said: If you are at the design stage it makes sense to design out the need to go through the steel, rather than paying for SE calcs, complicated steelwork etc I have to agree with that ...! I think you will at least triple the cost of the steel and I can guarantee no matter how well you position it, the hole will be in the wrong place ..!! There is no room for onsite adjustment with that level of tolerance. I've just had to redesign an entire bathroom as despite having a posijoist floor, there are strong backs through the middle and basically it's too low for a 110mm waste.... but if I look at the plans it's all perfect ..! Link to comment Share on other sites More sharing options...
Vijay Posted August 19, 2017 Author Share Posted August 19, 2017 As I said, not the end of the world to have to down the corner of the dining room which is what's been drawn. I'll be having a rethink as I do the drainage pipes Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now