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:
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•
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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
info@icop.it
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