Cofra B.V.

Cofra B.V.

- Model S - Vacuum Consolidation System

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The function of BeauDrain-S vacuum consolidation is based on the use of an air-tight hose. In this system, vertical drainage is only used in the compressible and sealing layers. The top layers of sand, where there is a risk of air or excess water inflow, are sealed off from the system with the aid of a thyleen hose. As a result, a vacuum can be applied to the drain. The vacuum in the drain translates into an equivalent (fictitious) vertical load at ground level. For each project the subsoil is studied carefully in order to ensure that the system will function as desired. A soft sealing layer of clay or peat must be present just below the surface.

Why BeauDrain-S?
The BeauDrain-S system is a combination of the normal BeauDrain system and vertical drainage. It was developed in order to be able to offer customised vacuum drainage for every surface, however small. The development of a hybrid of vacuum drainage and conventional vertical drainage gives the system the advantage over BeauDrain in that it can use the normal drainage stitchers. This means that its field of application is greater, without a great deal of extra cost. It can be installed anywhere in the world on every surface and at any depth. The work floor serves purely for the stability of the cranes.

Installation of the BeauDrain-S vacuum consolidation system
To prevent air leakage, a BeauDrain-S drain, pre-fabricated from a specially developed (MD88H) vertical drain, is coupled to a pre-determined length of thyleen hose. The thyleen hose is installed over the thickness of the working platform and, depending upon the groundwater level, pulled through into the sealing clay or peat layer by half a metre. The length of the hose is individually developed for each project or project area. After installation only the thyleen hoses protrude above the installation platform. After the cutting of the hoses to length, the BeauDrain-S drains are connected together into lines by means of couplings. These lines are connected to a vacuum pump at the edge of the field via a manifold and collecting hose.

  • Soil improvement of residential and construction areas.
  • The construction of infrastructure (roads, railways, harbours, airports).
  • Construction of dykes/embankments.
  • Speeding up the construction of the embankment
  • Improving areas at location where surcharge is expensive or scarce.

  • Faster preparation of residential districts for construction
  • Installation of infrastructure (roads, railways and airports)
  • Installation of dikes
  • Faster installation of embankments
  • Preparation of sites where settlement allowance is expensive or scarce
  • Advantages of the BeauDrain-S system:
  • Short installation period and clean work site after installation
  • No soil is excavated, thus preventing any damage as a result of horizontal deformation of the soil due to relaxation and insufficient filling
  • No supply of drainage sand or removal/storage of removed soil
  • The use of BeauDrain-S means that a very large working depth is achievable
  • Sand layers can be followed at a safe distance
  • The use of vacuum pressure gives rise to an increase in effective pressure this reduces the risks of instability in the case of ongoing embankment creation
  • The existing body of soil is used as a sealing medium, thereby dispensing with the need for a surface membrane
  • The work site becomes available for other activities immediately after installation and remains so
  • The barrier configurations are adapted to the soil type to be consolidated and the surface
  • Horizontal deformation in the event of ongoing embankment creation is considerably reduced
  • The BeauDrain-S system also allows for a considerable reduction of secular settlements and settlement differences

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