Stabilising cofferdam installation for United Utilities

Challenge

Ground instability and water ingress threatened the performance and integrity of a cofferdam during installation, requiring rapid stabilisation to maintain safety and programme.

Solution

Geobear used targeted geopolymer injection to strengthen soils and control water pathways, stabilising the cofferdam quickly with minimal disruption to construction activities.

Cofferdam stabilised

Ground bearing capacity improved

Water ingress controlled

Void formation mitigated

Rapid installation

Programme delays avoided

Background

Cofferdams are critical temporary structures used to create dry working areas in challenging ground and groundwater conditions.

Unstable soils, voids or unexpected water flow can compromise structural integrity and delay construction activities if not addressed quickly and effectively.

Traditional solutions can require excavation or dewatering, increasing cost and disruption.

Challenge

Instability and potential washout beneath the cofferdam posed risks to both structural performance and site safety.

A solution was needed that could strengthen the ground and manage water movement without halting ongoing construction operations.

Solutions

Geobear designed and delivered a precise geopolymer injection programme targeting weak zones and potential voids beneath and around the cofferdam.

The expanding resin improved soil strength, reduced permeability and enhanced overall stability.

Works were carried out efficiently, integrating seamlessly with the construction schedule.

Results

The cofferdam was successfully stabilised, reducing risk of settlement and water ingress.

The rapid, non‑intrusive approach helped maintain programme timelines while improving ground performance and site safety.

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