Assembly Of Post-Tensioned Concrete Pipe With Sheet Metal Jacket And Special Pieces, In Batches For The Work: "Modernization Of The Irrigation Of The Community Of Irrigators Of The Canals Of Bajo Carrión (Palencia)", Within The Framework Of The Recovery, Transformation And Resilience Plan Financed By The European Union – Nextgenerationeu, To Be Awarded By Simplified Open Procedure.