Put in spoiler-text for the courtesy of others:
You can temporarily solidify them using Concrete Shot. More detailed strategy follows in next paragraph if you're still stuck.
Come up the ladder, wait for the bottom one to stop, hop onto the lower platform in the middle, wait for the bottom one to shoot by and stop again, jump onto the right side, fire Concrete Shot when the bottom lava beam gets near you. Then hop onto it, face right, and fire concrete shot at the next beam before it gets to you. Hop onto that one, fire a shot on the topmost beam, jump onto it, and make your way to the ladder closest to you. It's incredibly tricky to get the timing down, but you'll get it eventually.
Hope that helps!