OUTLINED AGAINST against a cloud blue Septemeber sky, the high-iron carpenters pour concrete into one of the wooden molds that form the upper floors of the Academy House apartments and condominiums at Broad and Pine Streets. I've been watching these guys build this project for almost a year and I've gotten to know a few of them when they stop at Dirty Frank's for a beer after work. They've been in a sour mood of late. Two weeks ago one of their younger union members died when he fell six floors and was impaled on a steel rod.