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HomeFoundationsPilesScrewed soil displacement cast in-situ piles

Screwed soil displacement cast in-situ piles

Screwed soil-displacement cast in-situ or TVSi piles. These piles can be installed vibration free with or without groutinjection and with or without lost tube. The installation is relatively low-noise. Volker Staal en Funderingen has developed this pile to meet the ever increasing demand for foundations in vibration-sensitive areas, such as inner cities or e.g. refineries and pipelines. Because of the soil displacement, this pile has a relatively high load-bearing capacity.

Application

The piles are produced by screwing a steel casing into the soil using a rotary head on top of the casing  which is fitted in a hydraulic drilling rig with a fixed leader. The closed, auger-like drill tip displaces the soil. Shaft injection may be used, depending on the ambient conditions. Grout is injected at the drill tip during the drilling. When the casing is installed to the desired depth, reinforcement is placed inside the casing and the casing filled with concrete followed by the removal by rotating the casing back and forth. Depending on the application, it is also possible to install the steel piles by replacing the casing with a steel tube with usually a smaller wall thickness. The tube can be filled with rebar and concrete at a later stage. VSF currently has two drilling rigs for installation of these piles. The maximum length and diameters of the pile depends on soil conditions but can reach a maximum diameter of 800 mm and a length of 40 metres.

Ambient factors

Depending on the designed pile length and diameter, a large drilling rig may be required, so that there must be sufficient space for assembling and disassembling the rig.

If the tube is left behind, the top of the piles can also be drilled below ground- or water level by using a pile extension.

Pros and Cons

  • No vibrations
  • Low-noise
  • High pile bearing capacity
  • Excess grout may surface during installation

Applicated

Name of project

Client

Badhoevedorp, Foundation viaduct 14 A9

Construction consortium  Badhoeverbogen Civiel

Schiphol, Reconstruction C- and D-pier

Holland Scherm

Rotterdam, Foundation noise barriers along A20

Holland Scherm

Ens, Abutment Ramspol Bridge

Infrateam N50

Amsterdam, Foundation pilons Westrandweg

Van Hattum en Blankevoort

Amsterdam, Reinforcement quay wall IGMA

IJbouw

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