The orange steel tube is connected at both the slab and the masonry wall. This temporary bracing provides support for the wall until completion as well as ensuring the the wall remains plumb. When the wall is at a hight okay for the bracing to be put up, typically specified on the specs, bracing will be inserted into the mortar and also on the slab. The bracing on the mortar fits around a block, as noted in the picture below.
From there, the rod is attached to the wall bracing with a bolt and pin. The bracing has different holes where the bolt can go in depending on the height of the wall. This gives flexibility if you have to bolt the rod on the slab closer or further away from the wall because of conduit or other material coming out from the slab. Next the rod is attached to the slab in a similar fashion to the wall.
Although this picture doesn't show it, normally the rod allows you adjust its length so that you can get the wall plum. This allows one to fine-tune the rods length so that the wall is as close to plum as possible. It is so important that the adjustments are made because you are dealing with small units of measurement to correct a walls level. Again, the rod is attached to the ground with a bolt and pin. The bracing is held firm in place by a bolt that was shot into the concrete and then screwed tight to ensure it won't move.
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