Rabattement de nappe sur chantier avec des puits crépinés

Dewatering

Dewatering specialists since 1980, we have mastered all the drawdown techniques to dry up your work areas, whatever the geological nature of the land

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Principle

Under our feet, the water table is located at a variable depth.

This water table may be encountered while working on earthworks, which makes continuing with trenching and the construction of underground buildings (foundations of buildings and lower levels, car parks, metro stations, sewerage etc.) impossible.

Dewatering consists of putting in place a temporary pumping facility enabling the piezometric level of the water table to be lowered. Therefore the work may progress under optimum conditions.

Once the construction has finished, the water table returns to its normal level after the pumping equipment has stopped.

dewatering diagram

Lowering Techniques

Schéma rabattement de nappe par puits crépinés dans une paroi non étanche
Deep Well Dewatering – Non-Waterproof Retaining Wall
Often implemented by these sheeting techniques: wood or concrete lagging wall, shotcrete facing, retaining lagging wall, micro-piles, shoring retaining wall,...
Schéma rabattement de nappe par puits filtrants dans une paroi étanche
Deep Well Dewatering – Waterproof Retaining Wall
Rather used for enclosures of the type: steel sheet piling, secant piling, diaphragm wall, jet grouting, grouted wall, flexible wall
Schéma rabattement de nappe par pointes filtrantes
Wellpoint Dewatering
Wellpoints are frequently used in sandy ground that is moderately permeable: sandy, sandy-clay and sandy-loam soils
Schéma rabattement de nappe par épuisement de surface
Surface Dewatering
When the environment of the area of works permits, we set up a surface dewatering device, generally provided for a...

Project Management

Finishing the infrastructure in a good conditions with deadlines met is the key to a successful project, as you know. We also know this which is why lowering the water table must be done by expert and specialised teams.

Trust us with this work, we will advise you and work out a turnkey solution comprising design, equipment, labour, services and the result.

So, you deal with a single point of contact, capable of managing the entirety of the dewatering, while adapting to the demands of their customers.

dewatering-experts
ENGINEERING
IMPLEMENTATION
PROJECT MONITORING
COMMITMENT TO THE RESULT

FEASIBILITY STUDY

  • Hydrogeological environment, sheeting type, concrete slab type, and surrounding foundations awareness
  • Study of the risks and constraints
  • Advice on the choice of sheeting, foundations and methods of dewatering water disposal

ENGINEERING HUB

  • Expertise in geology, hydrogeology, geotechnology
  • Data analysis and interpretation for the project in cooperation with the customer design office
  • Definition of the process and of the suitable equipment
  • Scaling of wells and the pumping installation
  • Cost optimisation study
Case Studies