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DIAPHAGRAM

DIAPHAGRAM

DIAPHRAGM WALLS

The diaphragm wall construction methodology allows to build continuous reinforced concrete walls, which, using traditional technologies, can reach a maximum depth of 25-30 metres below ground level.

Installed in sequences of linear, box-shaped, circular, or polygonal forms, they are suitable for the construction of fluids containment tanks, underground car parks, defence and waterproofing of river dams, underpasses, etc. They are built excavating with clamshell buckets or with Kelly bars which have a variable width (usually 250 cm) and a thickness between 40 and 120 cm.

The stability of the excavation is ensured by using bentonite or polymer slurries. These slurries form an impermeable thin layer (cake) on the sidewalls, so that the hydrostatic force of the slurry can act to stabilize trench walls by replacing the gradually removed soil.

In the specific case of construction of waterproof diaphragm walls (bulkheads), the joint between two subsequent walls is sealed off by using a plastic joint (water-stop). The water-stop tape, firmly anchored in the concrete, prevents any infiltration.

SLURRY WALLS

The excavation method is similar to the one used for traditional reinforced concrete diaphragms walls. The main difference is in the materials used and in the purpose of the works.

The diaphragm walls are built without reinforcement cages and concrete: in fact, they are made up of the same bentonite slurry used for the excavation, which is then added to cement. The cement has the purpose to provide strength and an appropriate plasticity in order to ensure integrity over time.

Rather than structures, they can be considered ground lenses with improved geomechanical characteristics. They are perfect for waterproofing river dams, landfills sites, earth dam cores, and whenever it is preferred to eliminate water flows or fluids in general rather than the action of soil containment, typical of bulkheads. Worthy of note is the environmental value of this technique.

Working sheets

14546
All / France / Italy / French Guiana / Principality of Monaco

1312 – Le Pouzin (France)

1400 – Lot 1 Line 16 – Paris (France)

9988 – Kennedy square – Rimini (Italy)

1383 – T2B line 15 South – Parigi (France)

1374a – Project Ariane 6 (French Guiana)

1361 – Naples – Poggioreale metro station (Italy)

1343 – Darse Nord – Monaco (Principality of Monaco)

1319 – Porte de Clichy – Paris (France)

This post is also available in: French Italian

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    Economic and administrative repertory n. 131947 Udine
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