Maybe it doesn't have to be a permanent active structure. Have it inflate and deflate as needed. Step 1: Start shooting iron bullets at escape velocity strai

Maybe it doesn't have to be a permanent active structure. Have it inflate and deflate as needed. Step 1: Start shooting iron bullets at escape velocity straight up. Step 2: Something in orbit directs them back to earth. Step 3: There will be incredible gas pressures around the bullets going to orbit, task that pressure to support a tube around the bullets going into space. This makes for less air resistance for the bullets lessening amount of energy needed for escape velocity. Step 4: When tube reaches to top, send loads climbing up the tube. Anything that could withstand such pressures would probably melt or be too heavy.