I'm working on an extension and will soon mount base plates to weld VKR-profiles onto. These will support heavy HEA beams that need to be positioned correctly.
Now to my little conundrum: One end of the beams will be mounted in an existing building where I know exactly where they should be placed, how can I project this point down to the base plates 5.5 meters out and approximately 3 meters down in the easiest way?
Now to my little conundrum: One end of the beams will be mounted in an existing building where I know exactly where they should be placed, how can I project this point down to the base plates 5.5 meters out and approximately 3 meters down in the easiest way?
The easiest is to use a laser if possible; otherwise, measure or install the beam first and the columns afterwards if you have the option to chem-anchor the base plate instead.
If you're aligning several columns, you can measure from both edges to mark the column center in the corners then draw a line and either calculate the correct diagonal measurement or use trial and error and cross-measure until the corners are at 90 degrees. Then you'll know exactly where your measurement chain starts and ends, allowing you to place your base plates with the correct center-to-center spacing.
If you cross-measure, you can plumb the outside of the building to move the centers of the two inner measurement points outward and downward, so you don’t have to climb around like a monkey.
Edit 2: If you move the measurement points outward, consider if the supports differ in depth from the facade so they should be moved equally; otherwise, you'll create a rhombus.
If you're aligning several columns, you can measure from both edges to mark the column center in the corners then draw a line and either calculate the correct diagonal measurement or use trial and error and cross-measure until the corners are at 90 degrees. Then you'll know exactly where your measurement chain starts and ends, allowing you to place your base plates with the correct center-to-center spacing.
If you cross-measure, you can plumb the outside of the building to move the centers of the two inner measurement points outward and downward, so you don’t have to climb around like a monkey.
Edit 2: If you move the measurement points outward, consider if the supports differ in depth from the facade so they should be moved equally; otherwise, you'll create a rhombus.
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Cross-measuring can be difficult as I have a height difference on one side. The footplates need to be in place before the casting, they should be embedded in an exterior wall, making it hard to drill later. A laser would work, but I'll have to use it in the evening. The problem is that the existing house's walls are not plumb, so I can't start from the floor level. I'm attaching a picture of one corner (including the height difference).
