reconstruction; rework
Refers to doing construction work again, often to fix defects or redo a project. Common in civil engineering and building contexts.
The reconstruction of the bridge is scheduled to start next month.
Because defects were found, rework of the road became necessary.
再建 is broader, covering rebuilding of structures or organizations, while 再工事 is specifically about construction work.
Compound of 再 (re-, again) and 工事 (construction work). The derivation is transparent from its components.