Diaphragm Wall

Introduction

• Diaphragm Wall is generally reinforced concrete wall constructed in the ground using Under slurry technique which was developed in Europe.
• The technique involves excavating a narrow trench that is kept full of an engineered fluid of slurry.
• Walls of thickness between 300 and 1200 mm can be formed in this way up to a depths of 45 meters.

Diaphragm wall Application

• Commonly used in congested areas.
• Can be Installed in close proximity to existing structure.
• Practically suited for deep basements.
• Used in conjunction with “Top Down” construction technique.

Positive facades of Diaphragm Wall

• Can be Installed to considerable depth.
• Formation of walls with substantial thickness.
• Flexible system in plan layout.
• Easily incorporated into Permanent works.
• Designable to carry vertical loads.
• Construction time of Basement can be lowered considerably.
• Economic and Positive solution for large deep basement in saturated and unstable soil profiles.
• Can be used for seepage control in Dams.
• Noise levels limited to engine noise only.
• No vibration during installation.

Construction Sequence of Diaphragm wall

• Fixing of Alignment
• Stage-2: Guide wall Construction
• Stage-3: Trenching
• Stage-4: Trench Cleaning
• Stage-5: Stop ends fixing
• Stage-6: Reinforcement Cage lowering
• Stage-7: Placing of Concrete
• Stage-8: Withdrawal of Stop ends