Dear All
Joint pins are used in scaffolding to connect two vertical pipes...
I would like to know whether this practise is common for all type of scaffolds?
In Cuplock Scaffolding we are using Joint Pins... In Steel Tubular Scaffolding Joint Pins are advisable to use or not?
If we recommend the following in case of steel tubular scaffolding instead of Joint Pins any issues? "If two pipes are connected, are they overlapped at least 600 mm and at least two clamps used?"
Please come forward with your views...
From India
713Joint pins are used in scaffolding to connect two vertical pipes...
I would like to know whether this practise is common for all type of scaffolds?
In Cuplock Scaffolding we are using Joint Pins... In Steel Tubular Scaffolding Joint Pins are advisable to use or not?
If we recommend the following in case of steel tubular scaffolding instead of Joint Pins any issues? "If two pipes are connected, are they overlapped at least 600 mm and at least two clamps used?"
Please come forward with your views...
From India
Dear dipil,
No Mr.dipil we can't use joint pins on cup lock scaffolding as you knew without manufacturer advice can't modify anything it lead to accident it's not only for scaffolding suit for all equipments/machineries. . . Hope I am right!!!
Team,
Please come forward share your expertise with us & advice me if I am wrong!!!!
Keep on sharing. . .
From United States, Fpo
No Mr.dipil we can't use joint pins on cup lock scaffolding as you knew without manufacturer advice can't modify anything it lead to accident it's not only for scaffolding suit for all equipments/machineries. . . Hope I am right!!!
Team,
Please come forward share your expertise with us & advice me if I am wrong!!!!
Keep on sharing. . .
From United States, Fpo
Dear Dipil,
I remember having some discussion on scaffold earlier. I reiterate scaffolding is a specialization. A well trained scaffolding supervisors/inspector should be at site for doing scaffolding work. However your questions are answered here with an attachment.
A “brace joint” and a “runner/transom joint “are also given for your information.
Hope it will answer your question.
Regards,
Kesava Pillai
From India, Kollam
I remember having some discussion on scaffold earlier. I reiterate scaffolding is a specialization. A well trained scaffolding supervisors/inspector should be at site for doing scaffolding work. However your questions are answered here with an attachment.
A “brace joint” and a “runner/transom joint “are also given for your information.
Hope it will answer your question.
Regards,
Kesava Pillai
From India, Kollam
Dear Sir
Thanks for your reply and its almost clears my query... We do have a very good discussion on scaffolding in this forum, really it was also very helpfull...
Request you to go through the attachment and help me in clearing the following doubts regarding Joint Pins... The attachment showing the present practice which we are following in our plant for making scaffolding...
1. What shows in the picture is a right practice?
2. Whether we should demand for use of Joint Pin instead of such overlapping for connecting pipes vertically? What is the issues in doing such overlapping?
3. In using Joint Pin, if not maintain the verticality of scaffolding, on plumb level tension load may come on the joint pin and it can be the reason of scaffold collapse or not? Please explain?
4. Please let me know the specification for buying Joint Pins.
@All: Pls do have a look into the attachment and let me know your valuable inputs...
From India
Thanks for your reply and its almost clears my query... We do have a very good discussion on scaffolding in this forum, really it was also very helpfull...
Request you to go through the attachment and help me in clearing the following doubts regarding Joint Pins... The attachment showing the present practice which we are following in our plant for making scaffolding...
1. What shows in the picture is a right practice?
2. Whether we should demand for use of Joint Pin instead of such overlapping for connecting pipes vertically? What is the issues in doing such overlapping?
3. In using Joint Pin, if not maintain the verticality of scaffolding, on plumb level tension load may come on the joint pin and it can be the reason of scaffold collapse or not? Please explain?
4. Please let me know the specification for buying Joint Pins.
@All: Pls do have a look into the attachment and let me know your valuable inputs...
From India
Dear Dipil,
First principle in scaffolding is that the scaffold must be plumb and level in every respect. It is applicable to every component either a standard, a ledger or transom. That is why every scaffold craftsman carries with him a spirit level in his pouch all the time.
What I have seen in your picture is the worst case scenario I have ever come across. It is a horrible mistake. I am sure you do not have a trained scaffold crew at your site. If you have regular scaffolding work it is high time that you train your crew before a mishap. (Scaffold work is a specialization I repeat.)
You can join pipes using double couplers for bracing and bearer/ledger. Even then there is definite calculation for spacing the couplers which you can note from the figures I have provided.
For standards you have to use joint pins or “sleeve coupler” also known as “end to end sleeve coupler”. Overlapping and joining standards is not permitted because the scaffold will never be plumb with it. Sleeve coupler sketch also attached for you to see.
Your specification can be “Pressed Steel Joint Pin Coupler, European Quality Standard EN74 or BS 1139 and tested to ensure quality standards are maintained. Preferably zinc plated for longer life. Length 225 to 235 mm. for 48.3mm o/d Tube (or specify tube size).
End to end sleeve coupler Carbon steel, Diameter: 48.3mm as per 1.EN74/BS1139”
Regards,
Kesava Pillai
From India, Kollam
First principle in scaffolding is that the scaffold must be plumb and level in every respect. It is applicable to every component either a standard, a ledger or transom. That is why every scaffold craftsman carries with him a spirit level in his pouch all the time.
What I have seen in your picture is the worst case scenario I have ever come across. It is a horrible mistake. I am sure you do not have a trained scaffold crew at your site. If you have regular scaffolding work it is high time that you train your crew before a mishap. (Scaffold work is a specialization I repeat.)
You can join pipes using double couplers for bracing and bearer/ledger. Even then there is definite calculation for spacing the couplers which you can note from the figures I have provided.
For standards you have to use joint pins or “sleeve coupler” also known as “end to end sleeve coupler”. Overlapping and joining standards is not permitted because the scaffold will never be plumb with it. Sleeve coupler sketch also attached for you to see.
Your specification can be “Pressed Steel Joint Pin Coupler, European Quality Standard EN74 or BS 1139 and tested to ensure quality standards are maintained. Preferably zinc plated for longer life. Length 225 to 235 mm. for 48.3mm o/d Tube (or specify tube size).
End to end sleeve coupler Carbon steel, Diameter: 48.3mm as per 1.EN74/BS1139”
Regards,
Kesava Pillai
From India, Kollam
Dear Sir
Thanks a lot for giving this much details to me regarding joint pins...
Actually we having one corporate standard for making scaffolding... Which is saying the use of joint pins, but not having much supportive documents for this... As we have different standards, we have different act groups consisting of Line Engineers/Managers to implement these standards... As the Act Group leader who got trained on this standard was telling that Joint pin mentioned on the corporate standard was only applicable to system scaffolds (cup lock scaffolding) not totube and coupler scaffolds (steel tubular scaffolding)... I was not having any technical details to make him convince regarding the requirement of joint pins in tube and coupler scaffolds... Hence I start this thread...
With the details you provided; i have sent him mail with a copy to my boss... Advice him to procure the joint pins at the earliest... Once get the feedback from my management on this issue, I will let you know the status...
Thanks once again... Surely this helps me a lot at the right time and hope if I become successful to bring this practice implement in our plant, surely this will be a great initiative...
Today I talk to two persons, main foreman and supervisor of our scaffolding contractor.. both having more than 15 years of experience in making scaffolding... Both were telling in India they have worked for more than 20-25 sites... Except inside one refinery, everywhere they were making scaffolding by using the overlapping method... However they were ready to build with joint pins and say it's good also...
Thank you sir for giving such technical explanations and expecting your help in future too...
From India
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