This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 篺 is uncertain. It visually contains 竹 (bamboo) on top and 捭 (a rare character meaning to open or spread) below, but the original semantic and phonetic relationships are unclear.
The top component 竹 suggests bamboo, and the bottom 捭 is a rare character. Without a clear meaning, picture a mysterious bamboo object used for spreading or opening something.
For ハイ, imagine a bamboo raft (いかだ) floating on the water, and someone waves and says 'Hi!' (ハイ) from the raft.