Reinforcing plant trabe lock type cajon box section constructive details that includes a detailed view of elevation - trabe drawer 190/180, plant - trabe (kt6-7), reinforcing plant - trabe, detail of the integral neoprene supports, accessory acc-1 and acc-2, fixed support, Pre-strain detail, Pre-stress distribution, reinforcement and accessories acc-1, main reinforcement on the ends of the trabe, 2.5 d plastic ducts to give way to the diaphragm reinforcement rods in the core of the work shop and much more of constructive details.