Following the successful completion of European and Asian Anchor Block excavation support works, the contract for the construction of 365 m long European Approach Viaduct ground treatment and piling works has been signed with the consortium DLSY (Yapı Merkezi-Daelim-SK-Limak)
Within the scope of the ground treatment works of the project, approximately 120,000 m deep mixing column (DSM) and ~29,000 m³ unreinforced barrette piles shall be executed. In order to ensure the soft soil layers to be secured against liquefaction and deep seated slip; DSM columns to be constructed in 26.5 m length by means of intersecting cell lines and barrette piles up to 65 m depth constitute the difficult and ambitious applications of the project. In addition to the ground treatment works to be carried out around the foundations of viaducts; a total of 6,200 m foundation piles with a diameter of 150 cm and a maximum depth of 70 m shall be executed. Prior to the design applications of DSM columns, test columns shall be constructed to determine the engineering parameters of DSM columns and improved soil. Additionally, before commencement of the construction of piles with 150 cm diameter, 2 test piles shall be executed in order to verify the design load. These piles will be tested under a total of 26 MN axial load by means of bi-directional loading test. Bauer BG 45 bored pile, RTG 27S DSM and MC 64-BC-32 diaphragm wall machines; which are recently joined to our machinery park and equipped with the latest technology shall be used for the execution of the challenging works; much more deeper than the conventional works.