Construction
Installation
noun, verbal noun
If you have a shelf to establish on your wall, you'll need to do some construction and installation work.
架設 is pretty formal. Use it specifically for the kind of construction or installation you do with bridges, cables, electric lines, pipelines, and other stuff that stretches like a "shelf" from one point to another.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
今まで一度も橋梁を架設したことがありません。
I’ve never built a bridge before.