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Rüttel injection piles

RI is short for Rüttelinjektionspfähle, which are a special kind of the more common MV piles but are not driven but vibrated. An RI pile is an H-section beam with a bulge welded at the bottom where the injection lance ends through which grout is pumped while the piles are vibrated into the soil. Over time, the grout hardens and provides adhesion to the soil around it but during installation it serves as a friction reducer,

Application

These piles are used for such applications as tensile piles in construction pits, but because of their shape they are also capable of absorbing sufficient compressive forces during use. Because of the relatively high shaft friction, the pile can also be used as bearing pile from ground level. This type of pile is particularly used in Germany. In the Netherlands, the piles were used for the first time as foundation elements for anchoring under the underwater concrete floor of the building pit for the new RAI subway station in Amsterdam, as an alternative to previously planned vibro combi piles. The typical noise and vibrations these combi piles produce during installation would have been an unwanted effect next to the RAI conference centre, which was constantly in use during construction of the station. Post-finishing by divers is not necessary because of the advance assembly of the anchors for the underwater concrete.

Ambient factors

The piles are vibrated but because of the limited diameter and the use of a high-frequency vibrator with variable moment, this causes hardly or no vibration nuisance.

 

Pros and Cons

  • Hardly or no vibration nuisance
  • Hardly or no noise nuisance
  • Suitable for tensile and compressive loads
  • Because of large steel diameter relatively stiff compared to bored systems (GEWI)
  • No soil deposits on building pit bed during installation
  • Hardly any construction pit uplift due to soil displacement

Applicated

Name of project

Client

Amsterdam, Construction pit subway station RAI

Van Hattum en Blankevoort

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