The RD 260 Resonant Pile Driver (resonant driver) has proven to install long piles with negligible ground disturbance in urban areas. Recent projects further prove the versatility and applications possible using the RD 260 Resonant pile driver.
The resonant driver was recently used at the site of a major grade separation south of Amsterdam, at Den Haag, to install 34 m long micro piles. The micropiles are used as both compression and tension elements for the support of the structure walls and roof and to hold down the roadway base due to hydraulic uplift forces. A test program for a similar, more challenging project, with deeper anchors in harder soils was recently completed. The single pass tube was installed into soils with CPT Qc of greater than 300 Bar (30 MPa) in 11 to 15 minutes with no flushing and no spoil production. Tension load testing confirmed the anchor capacity to be 1125kN to 2160 kN, depending upon the grouting procedures.
The resonant driver was also used to install both combi sheet pile walls for Dyke stabilization and for displacement bearing piles. The combi wall required the installation of closed end 323 mm dia tubes with double AZ 18 - 700 pairs for dyke raising and stabilization. The bearing piles include closed end 273 mm and 355 mm dia mandrel driven piles (with a loss bit) which were concreted and the mandrel removed.
Subjects: None provided
Author: Matthew Janes, M.E.Sc., P.Eng.
Publisher: DFI, EFFC