Execution Of Concrete Slabs And Structures In The Prtr Project - Rehabilitation Works On The “Los Cerrillos” Forest House (San Rafael, Municipality Of El Espinar, Segovia) For The Information Centre Of The Sierra De Guadarrama National Park And Its Area Of ​​Socioeconomic Influence, Within The Framework Of The Prtr Financed By The Eu – Nextgenerationeu, To Be Awarded By The Simplified Procedure. (EXPIRED)