suru verb (special), transitive verb
span; lay across; build over
Used for constructing a bridge or similar structure across a gap, river, or valley. Often appears in formal or technical descriptions.
その川に橋を架する計画がある。
There is a plan to build a bridge over that river.
谷に鉄橋を架する工事
Construction is underway to span the valley with a steel bridge.