Copenhagen - SECANT PILES
Transcription
Copenhagen - SECANT PILES
Foundations 1296 – Skjold Plads Copenhagen - Denmark Execution of secant piles diam 1000 mm at Skp The Cityringen Metro Project - Copenhagen Denmark. Client CMT – Cityringen Metro Project Execution time June 2013 - on going Work value €1.713.000,00 Technical data Pile diameter 1000-mm Total bored length 6.140,00 m Interaxis 800 mm Drilling rig no. 1 Bauer BG39 Pile depth 15 ÷28 m Drilling rig no. 2 Bauer BG30 Drawing – Section of the station Site view I.CO.P. Denmarks Aps is responsible for the execution of the secant piles which will build the main box and the ventilation shaft of the new station of the metro in Skjold Plads. This is one of the 17 new stations which the consortium Cityringen is building in Copenhagen as part of the works for the construction of the new 16-kilometer-long ring to connect the central areas of Copenhagen (København H via Rådhuspladsen and Kongens Nytorv; Frederiksstaden via Østerport, Triangeln, Østerbro, Nørrebro, Frederiksberg, Vesterbro and back to København H) with the existing metro line. I.CO.P. is executing secant piles with diameter of 1000mm and interaxis of 800mm for a total length of 6.140,0m. The station consists in two parts: main box – where 28-meter-long piles were executed – and ventilation shaft – with 15meter-long piles. I.CO.P. has been employing for the execution of the piles two Bauer drilling rigs (BG40 and BG39) equipped with kelly bar and rotary drive with diameter of 1000 mm. Bauer and Brunello casings are installed over the entire length of the piles. Particular attention is paid during the excavation to the following conditions: • • • Soil stratigraphy (sandy layers alternating with sedimentary rocks and clay layers down to 22 m; CPH Clay limestone down to the trench end) ; Presence of confined and not confined aquifers; Closeness to apartment houses built without foundations in the early XXth century, still inhabited. In order to prevent neighbouring structures from settling, casings are permanently kept in advanced position with respect to the drilling tool during excavation. At the same time, in order to keep stable the hydraulic gradient between the trench and the surrounding aquifers, the trench is continuously filled up with polymer-added water. Great attention is paid to the installation of reinforcement cages as well. Indeed, as per technical specifications strict tolerances are to be observed, in particular with regard to pile length (+15/-5 cm), rotational motion (<5°) and vertical deviation (<1/100). Further preventive measures are taken, furthermore, in order to comply with very strict noise emission standards in urban areas. In order to be able to comply with the 80-dBa limit, state-of-the-art technologies and special noise-attenuating equipment are employed. As to environmental protection, I.CO.P. installed the particulate filter on all its machines. Concreting Via Silvio Pellico, 2 33031 Basiliano (UD) UDINE Casing removal Tel +39 0432 838611 Fax +39 0432 838681 [email protected] www.icop.it Cap. Soc. 5.000.000 € i.v. C.F. e P.Iva 00298880303 Reg. Impr. Udine 00298880303OH R.E.A.131947 Udine ISO 9001 ISO 14001 OHSAS 18001 SA 8000