Embankment on piles

AuGeo

  • Embankment on piles|AuGeo

    Embankment on piles The installation or renovation of infrastructure needs to be performed ever quicker and under strict conditions, in particular on main roads and motorways. As a result, our vertical drainage or BeauDrain techniques may not provide the desired results. For these projects, Cofra has developed the AuGeo embankment on piles system. Using this technique it is possible to deliver settlement-free road construction platforms in a very short space of time.

  • Embankment on piles

Description

The AuGeo technique
The AuGeo technique is a piled embankment system and differs from other techniques on the market by the use of a permanent casing when creating the piles, so that a minimum pile dimension can be guaranteed. This is particularly important in very soft soils. A large number of piles are installed in a dense grid by displacing the soils. A load-transfer platform (LTP) is constructed directly onto the piles. The LTP consists of geo-grids and a low modulus fill material.

Why AuGeo?
The settlement-free nature of the AuGeo technique means that it is well suited for projects in locations where there are existing buildings or infrastructure that must not be subjected to vibration and settlement damage. Thanks to the high production rates that can be attained, large areas can be made settlement-free in short periods. Due to the installation method using a static downward force, it is guaranteed that each pile has a predetermined load-bearing capacity. This also means that local variations in the soils can be accommodated for.

Installation of the AuGeo system
The AuGeo piles are installed in a pre-determined pattern from ground level. The piles are installed using a modified vertical drain “stitcher”. A round steel tube and a base plate are pushed into the ground until the required resis-tance is achieved. The tube is inserted at a regular speed, thereby keeping disruption of the subsoil and the piles that have already been installed to a minimum. When the pre-determined resistance is reached, the pressure is maintained and a plastic casing is placed in the tube. This plastic casing is three-quarters filled with mortar before the tube is retracted. After the complete withdrawal of the tube, the plastic casing is left behind in the subsoil. The plastic tube is then cut to length and fitted with a reinforcement basket and round pile head after which, the tube is then filled with concrete. After the concrete has cured sufficiently, the space between the pile heads is filled with sand or peat and the geo-grid is laid on top of the piles according to the design. Following the placement of the geo-grid, the mattress filling which consists of broken stone or aggregate is applied and the geogrid is folded back above the mattress.

Advantages

Advantages of the AuGeo system:

  • Rapid installation
  • High production rates possible
  • Vibration-free and low-noise installation
  • No risk of instability
  • No impact upon the environment
  • No consolidation time
  • Guaranteed pile diameter

Applications

Applications of the AuGeo technique include:

  • Installation and widening of roadbeds for new motorways and railways
  • Widening of motorways and railways
  • Foundation for roads in extension areas
  • Foundations for company floors

Reference

Reference embankmenent on pile AuGeo Video
2010
Church Manorway London, U.K. – 2.500 m2
Nove Mesto, Slowakia – 5.500 m2
2007
Sliedrecht, Netherland – 400 m2
2006
A15, Netherlands – 25.000 m2 Video
Nesselande, Netherlands – 4.000 m2
2004 – 2005
HSL A4, Netherlands – 4.000 m2

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