IS this in a narrow , pinch point? I mean, your strategy may be dictated in part by the lay of the land. You may not have the physical freedom to put into place some of the advice you will be offered.
In general, I would say, remember that it's about winning a battle, not necessarily winning the whole war at once. I would try approach and retreat.
If you have some room, I would approach the scary thing (st) and as soon as your horse starts to try and stop, you veer off to one side, keeping his head turned toward the st. He will likely trot off and try to turn around. Keep him turned toward it, and after a few feet, turn him to the other direction, but turn TOWARDS the scary thing, trot the other direction, zig and zag back and forth, always slightly facing the scary thing. If your horse starts to feel more accepting, less fighting, let him stop and rest, but NOT turn away from it. Then start again, zig zagging , and trying to get a bit closer with each zig, and letting him rest when he seems calmer.
And you might then , when things are pretty good, decide to turn him around, walk away for a bit, then head back toward it.. you won a battle.
If you can get him close to it, but not to pass it, and he's getting super upset, 'win' a set of zig zags, (meaning get him to stay facing and moving past the st), and then to rest there, and take that victor, and turn around and go home. But DON"T get off and lead him past.
The next time, you try for more. I don't think this is the only way. I"m sure there are others. Consider this video from Warwick Schiller