The tie beams are the large horizontal beams that form the base of the truss (the bottom of the triangle). We have three to get into position. Each probably weighs around 500 kgs, so they take some moving.
The first one is lifted into position above the kitchen using the telehandler. No such luck with the other two. We have to use a mechanical winch to lift these into position.
In all three cases, the final positioning is done using brute force (and a sledgehammer).

This is the large tie beam (the horizontal beam on the bottom of the truss) for the kitchen. This one we managed to get in position using the telehandler. Unfortunately, the telehandler would not reach for the ones in the lounge.