I can't seem to do it

There are 2 methods. Ideally, you bounce off the ramp after the first tube and take a mostly straight path through the concave bridge to get enough speed to bounce off a lower part of the spiral floor and get enough height to surmount the wall. If you don't get enough speed, you can squeeze through the gap between the fence at the top of the spiral and the spiral's inner wall to get the bounce that way.