System Birdscage.

[lmk]

I wondered with TG20 now including a free standing internal Birdscage, if anyone can tell me what if anything the system manufacturers have done to include the same structure in their own guidance notes?

 

[Gerscaff]

Probably Nothing Imk, They Did Diddly Squat About Sg4 10 So Why Change Now?

 

[lmk]

Surely some of them would have updated the advice given. Do you erect system birdcages and if you do, how do you restrain them?

 

[systemthefuture]

TG20 is guidance for tube and fittings only.System manufacturers refer to EN 11281.

With ref to SG4 10 most system manufacturers already had safe methods of erection and had been using Advance guardrails in Europe for years.

We use consoles and decks on inside as a step method

 

[lmk]

I know that tg20 is for tube and fit. I always thought manufacturers copied and pasted most of their guidance from that though, tie patterns being a good example.

How do you restrain a system birdcage?

 

[Alan Reade]

I know that tg20 is for tube and fit. I always thought manufacturers copied and pasted most of their guidance from that though, tie patterns being a good example.

How do you restrain a system birdcage?

I believe it is actually the opposite, the safe systems of work were developed by system companies such as Haki for instance and those systems taken to the NASC and added to TG20

 

[Havespannerwilltravel]

I may be wrong but I think tie patterns were first introduced by SGB when they bought cuplock onto the market. Until that all the NASC had was a tie every 32m2.

 

[lmk]

That surprises me. My understanding has always been tg20 was a rehash of Mr Champions book.

I was more interested in the practical side of things as opposed to the ssow.

 

[Alan Reade]

That surprises me. My understanding has always been tg20 was a rehash of Mr Champions book.

I was more interested in the practical side of things as opposed to the ssow.

Stuart Champion was employed at SGB in the 70's and 80's
TG20 was a rehash of BS5973 but Stuart was certainly a leader in the development of scaffolding and how it works.

---------- Post added at 09:47 AM ---------- Previous post was at 09:46 AM ----------

I may be wrong but I think tie patterns were first introduced by SGB when they bought cuplock onto the market. Until that all the NASC had was a tie every 32m2.

Correct HSWT
ties were at 32mSq for box ties and 40mSq for bolted ties on non sheeted scaffolds.
32ms on sheeted up to 25m high.

 

[lmk]

Excellent, obviously an extremely clever man years ahead of his time. I still feel his book should be used today.

Unfortunately, it doesn't include system, hence my original question.

 

[happyhugenoet]

TGs werre brought in to unify Traditional Tube and Fitting along the same lines as System in order to comply with EN as opposed to BS.
In the same way as a 13ft board lost a couple of Inches
If only Nick Farage was a Scaff then a sway brace would be good for 100ft

 

[Alan Reade]

Excellent, obviously an extremely clever man years ahead of his time. I still feel his book should be used today.

Unfortunately, it doesn't include system, hence my original question.

There is always the "manufacturers instructions" or I see no reason why you should need to adopt anything different to the T&F logic requirements, for free standing you would brace every line in each direction.

If you have a preference to tie then the same applies as with access scaffolds there is a requirement to tie the system against horizontal movement.

I note that TG has taken no account of the continuity afforded by the ledgers which has always been used to reduce the number of bracing lines/ties required.
It is this continuity that is missing in say cuplok thus the tie requirements.