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Diaphragm wall
Construction sequence
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Fields of application
Environmental impact
• Vibration-free installation
• Low noise pollution: engine noise only
• Removal of soil and disposal of bentonite
• The groundwater level must be located at least 2 meters below the working level.
• Wide working platform for the bentonite mixing process and large enough to create a material stockpile area: a minimum of 300 m² is necessary.
• Workspace surface: at least 17 m wide (minimal 15 m from the axis of the wall and 2 m in front of the wall)
• Removal of debris, demolition of old foundations and backfill with stabilized sand
• A stable, dry and flat work platform is required
Technical specifications
• Thickness of the wall from 0.5 m up to 1.5 m (0.50 m, 0.60 m, 0.80 m, 1 m, 1.20 m and 1.50 m)
• Standard depth of the wall up to 35 m, exceptionally up to 55 m and more
• The height of the retaining wall can be in excess of 20 .
• The installation of guide walls to stabilize the soil in the upper diaphragm level and guide the grab is necessary.
• The width of the trench is minimum one time up to 2.5 times the clam shell size width.
• Normally, a lamella is excavated in 3 successive sections: panel 1, panel 2 and the central panel or ‘merlon’, where the first two correspond with the clam shell width of the grab: 2.85 up to 3.30 m. The last section (central part or merlon) has a width of at least the thickness of the wall.
• The different trenches are connected together by means of joints so as to form a continuous enclosure inside the excavation (one single unit).
• Upon completion of the wall, provision of a uniform distribution beam is to be made (connection with the raft / slab and the structure)
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