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
Since 1980 we have set up lowering the water table by bleeder wells or deep wells in waterproof retaining walls, regularly implemented for very deep projects.
This drawdown technique is recommended when excavations are being undertaken in a waterproof retaining wall.
The relative waterproofing of the enclosure limits the incoming water flow.
Several wells are usually needed to dry the construction zone.
Setting up this lowering technique will depend on several factors: geology, lowering height, adjoining structures and the overall environment of the site.
The deep wells technique may be realised in several types of waterproof retaining walls:
- Sheet steel piling
- Secant piling
- Diaphragm walls
- Jet grouting
- Grouted walls
- Flexible walls
- Analysis and design: particular specifications, contractors tendering file, breakdown of total price, design note for the scaling, declaration of intention to commence works, local authority inspection visit etc.
- Realising deep wells with drainage blanket in outer surface
- Installation of a submersible pump inside each deep well
- Installation of the dewatering network
- Commissioning the lowering system