Events in 2011
|Pre-Assembly of the precast elements|
The pre-assembly phase begins with the unloading of the precast sections from the extendable platforms and then ends with the execution of the vertical joints; the different tower levels are set up and ready to be lifted by the main crane for the last assembly phase.
The pre-assembly process is described in the following infographics:
Arrival of the precast elements, from section 0-20 meters, which are placed directly on top of the foundation. This section is made up of 4 or 5 parts depending on the base diameter of the tower.
The rest of the voussoirs, from section 0-20, are placed correctly in their final emplacement, ensuring the final geometry with topographical laser measurements.
The precast elements, from section 20-40 meters, are temporarily placed on auxiliaring trestles to have a support until the vertical joints of this section are done and before it is raised to its final position.
The rest of the intermediate sections are done in the same way. Section 40-60 (80 meter tower) Sections 40-60 y 60-80 (100 meter tower) Sections 40-60, 60-80 y 80-100 (120 meter tower). Generally, the upper tower level will not require pre-assembly in the site since it is transported in one piece from the factory.
Once all the vertical joints are finished, the complete sections of the tower remain stable and ready waiting for the final erection with the main crane.