架設

1. Origins, structure, and basic meaning

• Structure: 架設 (かせつ) is an action noun, used with する, for erecting or spanning structures such as bridges and power lines.
• Basic usage: 歩道橋を架設した makes the installed footbridge the object of a completed action, while 送電線の架設工事 uses power-line erection to specify the kind of work.

2. Common pitfalls and similar expressions

• The head noun in construction work
  • In 架設工事, what began is the 工事, with 架設 specifying its purpose. It does not say that installation was already completed as in 架設した.