sedan, snowshoes
樏 centers on a portable enclosed seat carried by people (a sedan chair) and, by extension, the snowshoes that carry a person over snow. Both meanings share the idea of a conveyance that lifts and supports a person.
樏 is a phono-semantic compound: 木 (wood) suggests a wooden structure, and 累 (accumulate, bind) likely contributes the sound and the idea of something that carries or supports a load. The exact historical development is uncertain.
A wooden (木) structure that accumulates (累) and carries a person: picture a sedan chair made of wood, or wooden snowshoes that accumulate snow but keep you afloat.
For ルイ, imagine a sedan chair carried by a loyal (ルイ) servant named Rui. Rui -> ルイ, and he carries the wooden sedan chair.