Perka: Guide to Raising M4000 Type Frames

Return to Perka Library Guide to Raising M4000 Type Frames (Tapered columns & rafters) For Building frames up to approximately 40’ wide/12’ high (single angle frames) 1. Bolt one half of a truss together at the haunch connection (finger tighten only, until ready for sheeting). 2. Install all bottom chord braces while truss is on the ground. 3. Bolt together the column & rafter of the other half and repeat steps #1 & #2, readying them to be lifted. 4. Starting with 2nd frame position, one in from end, using proper lifting straps and/or slings, lift one half section and hold or rest up on a yoke formed with scaffolds. 5. Raise other half and join the two sections at peak of ridge. **As the frames are being lifted, it is important to have men lifting at the haunch to prevent twisting. Also, make sure that slings/straps are tightened before rising. 6. When frames are up, finger tighten nuts on anchor bolts. Do not over tighten, you may have to shift frame around when squaring your building. 7. At this point, you should cable brace your frames for rigidity. 8. You are now ready for your second frame. Set frame in same manner as first. Install eave purlins and then every second purlin from this point across frame putting only one fastener per end. Install x-bracing where necessary but do not tighten. 9. Using the windbrace rods, plumb the columns of the building and (with site engineer’s approval) using washers or shims under the base plates, align the columns across the width of the building. Now, tighten nuts on anchor bolts. 10. Continue in same manner until all of the frames are up. By using intermittent purlins only, you will save valuable crane and equipment time. NOTE: It is not recommended that buildings OVER 40-12 be raised in this fashion.