ציטירנדיקער פּירוש אויף דברי הימים א 11:8

and the work was improved A similar instance is (Neh. 3:34): “Will they revive the stones” of Ezra. Also, above (I Chron. 11:8): “and Joab sustained.’

And he healed By way of borrowing [from its original meaning], it used the term, healing, [to mean] building a destroyed building. And likewise (Nehemiah 4:1), "that healing had come to the walls of Jerusalem"; and likewise (I Chronicles 11:8), "and Yoav resuscitated the rest of the city."