Construction
Building
noun, verbal noun
The shelf, once established, makes up the construction and building of the building. Just think of a building that's being built. It looks like a little shelf, doesn't it? That's important because this type of construction usually goes over something between two things, like a bridge.
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.