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![]() This example highlights the interaction between construction, analysis and documentation, which is often put to one side or considered as an afterthought. When we start to think about positioning these joints it is usually after the initial modeling and global analysis. Herein lies a possible problem: should these joints be modeled in the correct locations from the start and with the correct parameters? When we think about a splice joint we generally gravitate towards a column splice. In steelwork that takes the form of increasing the length of a column or a beam or even a truss. As we introduce these splice joints, we can utilize greater efficiency in design by increasing the size of a column as we go down or by splitting a long beam into smaller ones to allow for easier installation. Understanding the constraints and forces involved is one thing being able to apply them correctly is another. This is where IDEA StatiCa can greatly help with the workflow by examining the various conditions and load cases to make sure the joint is both safe and efficient. Much has changed since then (including the use of computers).Ī splice is something that joins one item to another. We see this every day but probably don’t realize: how long can a cable or drain or a brake line on a train be? All things have a finite length or weight. Sometimes there is an imposed limit on how long or heavy something can be. A splice is a way of increasing that length or weight. It was one of the very first connections I designed way back when I was at university. The gap would mean that the weight of the stack would no longer be transfered to the bottom of the stack, but I would be depending on the bracing to hold the upper stack forever.When I was asked to write a blog article about the splice connection I thought “great”. Whereas, if I leave the lower hub, I would have to cut the new piece a little short to be able to rock it into the hub. This would let me cut the fitting to exactly fit, and carry the load of the stack down to the lower stack, like was happening before. I was think this might be the way to go so that I can cut the new fitting to exactly fit the gap created by the old one. ![]() One more question (probably not the last): Do I cut the hub off of the four inch below the bad T after I remove it, so I can use no-hub to make both the upper and lower connections. I realized reading these posts that if I do my cutting on the old fitting, the cuts do not have to be perfect. If the cutter wont fit, onto the sawzall. ![]() I am going to brace it really thoroughly and try to snap-cut out the bad fitting. I now feel confident enough to try this this weekend. You guys have all been awesome with your advice. Re: crack in 100 year old cast-iron waste stack I am concerned that if I do not support it perfectly, it might shift when I cut it, causing leaks where the toilet and sink attach to it on the second floor. ![]() I have also thought about cutting the cracked T out and inserting a new plastic T with no-hub connectors above and below, but there is no exposed place ( like another T ) where it would be east to support the vertical stack. Other than replacing the whole stack, which would require ripping out floors, walls and ceiling, as well as roof repair, I am wondering what my options are.Ĭan the cracks in the cast -iron be welded? The stack runs from the floor of the basement through 2 stories, through a small attic and out the roof. I tried to remove a leaking 2" cast iron pipe leading into the 4" cast iron stack, I cracked the stack around the collar where the T joins the vertical stack. Crack in 100 year old cast-iron waste stack ![]()
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