NZ Non-engineer
Structural
- Mar 13, 2023
- 1
Hi everyone, Firstly I'm new to this forum and I'm a non-engineer in New Zealand. Design is my background, and whilst I have the design of something in my head I'm not too sure how to practically pull it together. My problem...
I want to tie two steel pipes together in some fashion. The first pipe is about 2.5m long and somewhere between 200mm and 250mm in outside diameter. Over, and outside, one end of this first pipe, for a distance of about 0.5m, I want to slot another second steel pipe. This second steel pipe will be about 2m long and have an outside diameter of about 300mm and an internal diameter of around 270-280mm. Consequently between the outside edge of the inner first pipe and the inside edge of the second outer pipe there is a gap of between 10mm to 40mm. The question is how can a tie these two pipes together so that they don't move in relation to each other. Some other considerations...
- The two pipes will be standing vertically, with the smaller pipe on the bottom and the larger pipe above it. Total height will be 4m (2.5 + 2 - 0.5).
- Both pipes will be supported weight wise , in that the smaller pipe will have its bottom edge/circumference resting on the ground, and the upper pipe will be supported weight wise with guy wires (so it is effectively floating off the ground)
- Two holes could be drilled into each of the pipes (somewhere along their 0.5m 'join') if necessary for tieing purposes (e.g. to fit a bolt through)
- I'm wanting the pipes to be reasonably stable together so that if say a member of the public pushed one pipe, or say a very big wind comes along, the two pipes stay perpendicular to the ground. i.e. one pipe doesn't move to a different angle to the other pipe
- Ideally I want the 10mm to 40mm gap around the pipes to remain. If no tieing mechanism could allow this then I could reduce the gap (but I'd still want some gap to remain for at least part of the circumference)
- welding and adhesives aren't an option
- Each pipe being the length it is precludes the ability to reach into/inside either pipe to say attach an inner nut to a bolt
- A single bolt that reaches all the way through the pipes (i.e the bolt is greater than 300mm long) is I think going to be a problem to install as gravity on it as it is pushed through the pipes, would make the finding of the outside holes difficult to locate. (i.e. bolt could go through near side holes easy enough but finding the holes on the other side of pipe would be tricky.
Any help on solving this tricky problem would be much appreciated. I'm not one of those designers/architects that likes to present a pretty picture and then leave it up to the engineer/builder on site to come up with how it comes together physically. That's unfair. Many thanks.
I want to tie two steel pipes together in some fashion. The first pipe is about 2.5m long and somewhere between 200mm and 250mm in outside diameter. Over, and outside, one end of this first pipe, for a distance of about 0.5m, I want to slot another second steel pipe. This second steel pipe will be about 2m long and have an outside diameter of about 300mm and an internal diameter of around 270-280mm. Consequently between the outside edge of the inner first pipe and the inside edge of the second outer pipe there is a gap of between 10mm to 40mm. The question is how can a tie these two pipes together so that they don't move in relation to each other. Some other considerations...
- The two pipes will be standing vertically, with the smaller pipe on the bottom and the larger pipe above it. Total height will be 4m (2.5 + 2 - 0.5).
- Both pipes will be supported weight wise , in that the smaller pipe will have its bottom edge/circumference resting on the ground, and the upper pipe will be supported weight wise with guy wires (so it is effectively floating off the ground)
- Two holes could be drilled into each of the pipes (somewhere along their 0.5m 'join') if necessary for tieing purposes (e.g. to fit a bolt through)
- I'm wanting the pipes to be reasonably stable together so that if say a member of the public pushed one pipe, or say a very big wind comes along, the two pipes stay perpendicular to the ground. i.e. one pipe doesn't move to a different angle to the other pipe
- Ideally I want the 10mm to 40mm gap around the pipes to remain. If no tieing mechanism could allow this then I could reduce the gap (but I'd still want some gap to remain for at least part of the circumference)
- welding and adhesives aren't an option
- Each pipe being the length it is precludes the ability to reach into/inside either pipe to say attach an inner nut to a bolt
- A single bolt that reaches all the way through the pipes (i.e the bolt is greater than 300mm long) is I think going to be a problem to install as gravity on it as it is pushed through the pipes, would make the finding of the outside holes difficult to locate. (i.e. bolt could go through near side holes easy enough but finding the holes on the other side of pipe would be tricky.
Any help on solving this tricky problem would be much appreciated. I'm not one of those designers/architects that likes to present a pretty picture and then leave it up to the engineer/builder on site to come up with how it comes together physically. That's unfair. Many thanks.
