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Combi walls

VSF has made combi walls for various clients. Combi walls are retaining walls made out of a combination of tubular piles and sheet piles. With the piles providing strength and the sheet piling serving as soil-retaining structure. Combi walls are used when sheet piling is no longer sufficient or economical. The tubular piles can have diameters up to 1820 mm and lengths of up to 40 metres. The sheet piling is usually shorter than the piles, with the piletin level often not much deepr than 2 metres beyond excavation depth. For correct positioning, a piling frame is used and two surveyors are used to guide the pile from 2 directions. Where possible and allowed, the piles are vibrated to the desired depth, otherwise they are driven at a later stage with a hydraulic or diesel hammer to provided for the necessary bearing capacity.

Application

The combi walls can be installed both on land and on water.

Ambient factors

  • Must be constructed at least 0.5 metres from an adjacent structure.
  • This clearance is needed for the equipment.
  • Vibration-free and low-noise.
  • Space utilisation can be easily organised.

Pros and Cons

  • This low-noise and vibration-free system can be used to make a buildingpit wall or foundation element.
  • It can be constructed a short distance from adjacent structures.
  • No soil relaxation or soil tensioning with the cased option.
  • Pile walls have an excellent strength to stiffness ratio.
  • Soil must be removed.
  • Final water-retaining properties cannot be guaranteed because of the many interconnections of the piles.

Applicated

Name of project

Client

Gouda, 2nd Juliana lock

Van Hattum en Blankevoort

Pernis, Mooring facility quay 8 NOVA Terminals

Port of Rotterdam

Ens, Bascule basement Ramspolbridge

Infrateam N50

Rotterdam Maasvlakte, Quay wall EMO

Van Hattum en Blankevoort

Rotterdam Maasvlakte, Quay wall Maasvlakte 2

Comb. Van Hattum en Blankevoort / BAM Civiel

Rotterdam Maasvlakte, Construction pit Electrabel powerplant

Visser & Smit Bouw 

Utrecht, Abutments motorway A2

Van Hattum en Blankevoort

Utrecht, Abutments motorway A2

Construction consortium A2 Hooggelegen

Utrecht, Overpass widening motorway A2

Combinatie A2

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