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Screw jacks for scaffolding (as opposed to shoring) are relatively light. Screw jack extensions will have to be checked. I'll be working with an allowable load of 3k +/- per leg which has a factor of safety of 4. If the frames are tied together with continuous scaffold x-brace end-to-end and bottom-to-top, you may not need any additional x-bracing (assuming the scaffold x-braces run parallel with the face of the building). I'm assuming that is the length parallel with the existing buildings. The x-bracing each side will be effective only if you've ensured good member continuity in the 60' direction. Which direction will the scaffold x-braces run? Parallel with the existing buildings would make sense if you're utilizing "walk-through" scaffold frames. There will be horizontal bracing at the areas which will have an extension bracket. I was also going to have diagonal bracing at every level on both sides. There will be a temptation to load up the platform as much as possible to minimize hook/lift time. You say "workers' platform" - for what kind of work? If it's masonry, you should limit the stockpiling of brick/block on the scaffolding. I was going to tie the frame to the building at each tier and limit the number of levels that could be loaded simultaneously. RE: Where can I find a book on frame/pipe scaffold design? RHTPE (Structural) 5 Nov 10 10:04Īnchorengineer, Some additional thoughts: I would ass-u-me that the rest is out of my responsibility. There are also daily inspections required as well. It must be erected by a qualified/competent person. I was going to make notes that the scaffold must be in new or good condition. Screw jack extensions will have to be checked.Īs a structural engineer I have to make some assumptions as to the condition of the scaffold.
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With the data I received from one manufacturer of the scaffolding, I was going to tie the frame to the building at each tier and limit the number of levels that could be loaded simultaneously. This scaffolding design work is new to me although I've been on scaffolding for many years now. The "black box" comment is me just being used to designing every member and connection per the building codes. I will have to design an elevated platform for some of the feet that will span between the 2 buildings. It's going to be sandwiched between 2 buildings. I have a Medium Duty workers platform that is going to be 125' tall x 60' long. Northeast USA RE: Where can I find a book on frame/pipe scaffold design? anchorengineer (Structural) Tell us a bit more about your specific application. If you're dealing with rental equipment, I can tell you that at least one domestic source arbitrarily reduced leg capacity because of the age & condition of their rental fleet.
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Of course, that testing was done on new equipment. Having been inside that "Black Box" (in the shoring industry), I can tell you that most domestic manufacturers & suppliers have developed load charts based on load tests. Screw jack extension also has an impact on leg capacity - some have a very limited range of adjustment and really have little impact on leg load - others have a rather long range of adjustment and a greater influence on leg capacity.Īs far as your "Black Box" comment - from the outside looking in, I can agree that's what it appears to be. Keep in mind that the lacing must be anchored to a secure support. As the height grows, the more a scaffold/shoring tower starts to behave as a single post shore, and horizontal lacing should come into play to stiffen the legs. Obviously, the taller the stack, the lesser the capacity. Bil-Jax also fabricated for themselves and others (Waco & Patent?). Each had their own load charts which diverged as the height increased. Safway sold off their heavy-duty shoring equipment to Symons and it has become mixed in with Symons own equipment. Harsco Infrastructure (Patent Scaffolding) could be one source. It will depend on your application - are you designing a scaffold application (i.e. Most every overseas source for the same that I have encountered tends to be overly optimistic about their products' capacity. Anchorengineer, Having worked in the concrete & temporary shoring field for many years, I can tell you that almost every domestic source of pipe frame scaffold/shoring that has a rental fleet would be unwilling to publish any leg capacity charts, let alone release their charts to anyone except for a specific application that they designed.