Pre-cast concrete beams are used in large light structures or in situations where the formwork execution is complex. They are generally applied for the construction of industrial, commercial buildings, warehouses or bridges. A great advantage of pre-cast concrete beams over on-site beams is the ability to prestress parts at a low cost. This allows to support large loads or greater lights at a lower cost than the solutions offered by metal structures or concrete made on site. There are several types of beams depending on their use. The roof beams of industrial buildings or large surfaces are usually pre-tensioned beams of type I. These beams can reach lengths of 40mts, of free light although always depending on the overhead they have. The beams can be, VR, VL, VT and VI, each type is used for different purposes such as, mezzanines, empty gates, etc.