Techniques

Diaphragm wall

A diaphragm wall is a reinforced concrete wall that is made in situ. The trench is prevented from collapsing during excavation, reinforcing and casting by the use of supporting bentonite slurry. The slurry forms a thick deposit (the cake) on the walls of the trench which balances the inward hydraulic forces and prevents water flow into the trench. A slurry made of polymers can also be used.

Trench stability is maintained by the use of panels of a length not exceeding about 7 m, although this can vary according to the type of soil and the neighbouring ground.
When existing buildings are alongside, the minimum distance between the main surface of the building, including its foundations, and the external panel of the wall being built will be equal to the thickness of the guide-wall.
When a panel has been excavated, the reinforcing cage is lowered into the trench, which is filled with slurry that has been pre-treated to minimise ground particles in suspension.

To make the panels, the trench is then filled with concrete from the bottom up, using tremie pipes.

.The joint between two panels can be constructed in two different ways:
- using a CWS steel formwork section that will provide a sealing system between the panels and will provide guidance for the excavation grab.
- With the hydrofraise, it is possible to bite into in the concrete of the adjacent primary panels, thus making a direct concrete to concrete interlock.
The conventional widths of diaphragm walls are: 0.50 m, 0.60 m, 0,.80 m, 1.00 m, 1.20 m and 1.50 m.

Download the Diaphragm Wall and Barrettes Brochure

Parois moulées & Barrettes va.pdf


Réalisations

Climespace Refrigerating Plant

Work : REHABILITATION OF STRUCTURES AND UNDERPINNING WORKS,URBAN EXCAVATIONS | Year : 2005 | Location : FRANCE

Special foundations for the construction of a refrigeration plant under the Palais de Tokyo in Paris.

A500.pdf

Harlay car park

Work : UNDERGROUND CAR PARKS ,URBAN EXCAVATIONS | Year : 1997 | Location : FRANCE

Design and construction of 10-level 295 place underground car park.

A387.pdf

Levesque tank

Work : SEWERAGE,STORM WATER TANK | Year : 2008 | Location : FRANCE

Construction of a 3,500m3 capacity storage tank.

A515.pdf

The Sail Marina Bay

Work : BUILDING,URBAN EXCAVATIONS | Year : 2005 | Location : SINGAPORE

An innovative retaining wall and barrette pile foundations for a high rise condominium.

A454.pdf

Isséane

Work : BUILDING,URBAN EXCAVATIONS | Year : | Location : FRANCE

Deep foundations works for a household waste treatment plant.

A498.pdf

Underground car park Place d Arvieux

Work : UNDERGROUND CAR PARKS ,URBAN EXCAVATIONS | Year : 2006 2008 | Location : FRANCE

Construction as a main contractor of a cylindrical underground car park comprising 7 basement levels.

A537.pdf

Nile City - Cairo

Work : BUILDING,URBAN EXCAVATIONS | Year : 1998-1999 | Location : EGYPT

Retaining wall and foundations for 36-storey property with four basement levels.

A350.pdf

Marina bay sands

Work : BUILDING,URBAN EXCAVATIONS | Year : 2007 | Location : SINGAPORE

Basement retaining walls and foundations for 3 high rise hotels

A496.pdf

Oxygene tower, Lyon

Work : BUILDING,URBAN EXCAVATIONS | Year : 2007 2008 | Location : FRANCE

The 115m high Tour Oxygène building backs on to the Part Dieu shopping centre in the heart of the business quarter of Lyon.

A511.pdf

Saint-Michel car park

Work : UNDERGROUND CAR PARKS ,URBAN EXCAVATIONS | Year : 1997 | Location : FRANCE

Design and construction of 6-floor 430 place underground car park.

A310.pdf

Culture and Exhibition Centre

Work : BUILDING,URBAN EXCAVATIONS | Year : 1996 | Location : MONACO

A turnkey 17 000 m2 excavation.

A302.pdf

Carrefour Romarin - La Madeleine

Work : ROAD STRUCTURES | Year : 2006 | Location : FRANCE

Sensitive geotechnical works for the Grand Boulevard roadway drop.

A512.pdf

Alexis storm water tank

Work : STORM WATER TANK | Year : 2007 | Location : FRANCE

Construction of a 4,500m³ capacity storm water tank.

A513.pdf

Concarneau dry dock

Work : MARITIME WORK | Year : 2001 | Location : FRANCE

Design and construction as main contractor of dry dock, length 130m, width 27m, depth 10.80m.

A390.pdf

Bolchoï Theatre

Work : BUILDING,REHABILITATION OF STRUCTURES AND UNDERPINNING WORKS | Year : 2006 - 2007 | Location : RUSSIA

Underpinning works to refurbish the Bolshoi Theater and create a major underground part.

A524.pdf

Baudoyer car park

Work : UNDERGROUND CAR PARKS ,URBAN EXCAVATIONS | Year : 1995 | Location : FRANCE

Design and construction of 5-level 320 place underground car park.

A311.pdf

McDermott Terminal

Work : MARITIME WORK | Year : 2009 | Location : MEXICO

Construction of a terminal for constructing and launching offshore oil platforms

A540.pdf

Thu Thiem Tunnel

Work : ROAD STRUCTURES,TUNNELS | Year : 2005-2006 | Location : VIETNAM

Construction of two cut and cover approaches on both sides of a tunnel under the Saigon river.

A504.pdf

Brest - dry dock no1

Work : MARITIME WORK | Year : 2006-2008 | Location : FRANCE

Widening and modernisation of Dry Dock N°1 at the Brest Port de Commerce.

A477.pdf

C854 Farrer Rd Station & Tunnels

Work : METROS | Year : 2006 | Location : SINGAPORE

Retaining walls for a mass transit railway station and cut & cover tunnels.

A486.pdf

Zeebrugge gaz terminal

Work : SHAFTS | Year : 2005 | Location : BELGIUM

Construction of a circular shaft to take a gas reservoir.

A507.pdf

Carré Royal - Reims

Work : REHABILITATION OF STRUCTURES AND UNDERPINNING WORKS,URBAN EXCAVATIONS | Year : 2006 | Location : FRANCE

Facades underpinning and creating a new excavation within the perimeter of the former Galeries Rémoises.

A523.pdf

Clarke Quay station and tunnels

Work : METROS,RAILWAY WORKS,TUNNELS | Year : 1997 - 1999 | Location : SINGAPORE

Geotechnical works associated with the construction of a major underground station for the Singapore MRT North East Line.

A351.pdf

Grand Palais

Work : REHABILITATION OF STRUCTURES AND UNDERPINNING WORKS | Year : 2001 - 2003 | Location : FRANCE

Underpinning the “Grand Palais”, built in 1900 and protected as a National Heritage monument, and creating a new retaining wall for a future underground structure in the main hall.

A443.pdf

Toulouse metro, B Line, Contract No 3

Work : METROS,RAILWAY WORKS,SHAFTS,TUNNELS | Year : 2001 - 2005 | Location : FRANCE

Construction of 1.1 km of tunnel, an underground station and 2 shafts.

A528.pdf

Port 2000 quayside 1 to 4

Work : MARITIME WORK | Year : 2001-2005 | Location : FRANCE

Realisation of the first 4 quayside berths for Port 2000 operation (1,602m of length)

A462.pdf

Vincom Block B

Work : BUILDING,URBAN EXCAVATIONS | Year : 2008 | Location : VIETNAM

Diaphragm wall and barrette works for the first six-level basement project in Vietnam.

A525.pdf

Provence Opera building

Work : UNDERGROUND CAR PARKS ,URBAN EXCAVATIONS | Year : 1992 | Location : FRANCE

Heavy duty, composite material ground soil anchors.

A204.pdf

El Azhar road tunnels

Work : ROAD STRUCTURES,TUNNELS | Year : 1998-2000 | Location : EGYPT

Construction of two 2.7km tunnels under old Fatimid city and Khan El Khalily working class district.

A379.pdf

Rivière des Pluies viaduct - Saint-Denis, La Réunion island

Work : ROAD STRUCTURES | Year : 2006-2007 | Location : FRANCE

Foundations of the viaduct and protection of the embankment works.

A530.pdf


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