I'm hoping you guys can help me out regarding a couple of best practice questions in particular survey penetrations on concrete building structures and also lift/stair jumpform.
Have done setout before on concrete structures with only up to 5/6 floors by resecting from fixed control on neighbouring buildings, however on higher structures, once control is no longer visible i will be plumming up using penetrations in the floor slabs which i've not done before. I'm wondering the best way of doing this regarding the setup? (setup over one plexi glass plum point and a standard single backsight to another??)
Also how is it possible to use this method to do prepour setout once floor above has been propped up?
The other question i have is regarding setout for the jumpform on lift/stairs. Current site has corrugated tin surrounding the jumpform meaning that it is next to impossible to do any prepour checks on the ply.
So far i've been setting up on top of the jumpform (not the most stableat times) and have been setting pins out for centre line of walls.
With the edge protection being about a metre high around the jumpform, i'll once again run into problems with the higher floors with seing control on neighbouring buildings.
Any tips or ideas would be greatly appreciated guys