The PageLines Framework includes its own Loop code in the theme files. The forum post provides instructions how to use a child theme to override the default Loop.
It’s also possible to have multiple Loops, each showing as a separate drag-and-drop section. If you already have PageLines, this image (snagged from the forums) is all you need to see to understand what I’m talking about:
Here’s the link to the forum topic for you to see all the code and instructions: http://forum.pagelines.com/topic/15759-the-loop-in-pagelines-framework/