Void filling beneath a gas sub‑station, Romford, UK
Challenge
Voids beneath a live gas sub‑station in Romford risked ground instability and asset damage, requiring urgent stabilisation without interrupting operations.
Solution
Geobear used precision geopolymer injection to fill voids and strengthen underlying soils, stabilising the sub‑station safely with no excavation and no disruption to service.
Live utility environment
Works completed safely
Voids filled
Subsurface cavities stabilised
No service interruption
Operations maintained throughout
Background
Ground voids beneath utility infrastructure can develop due to washout, leakage or historic ground conditions.
In critical environments such as gas facilities, instability presents significant safety and operational risks.
A rapid, non‑intrusive stabilisation method was required.
Challenge
Voids were identified beneath a gas sub‑station in Romford, creating concerns over settlement and structural integrity.
Given the live nature of the facility, traditional excavation was not feasible due to safety constraints and the need to maintain continuous operation.
Solutions
Geobear carried out a detailed assessment to determine the extent of the voiding. Controlled geopolymer injections were delivered through small access points, expanding to fill cavities and compact surrounding soils.
The lightweight resin restored ground stability without disturbing the structure or services.
Results
The voids were successfully filled and the ground stabilised, mitigating risk to the sub‑station.
The project was completed quickly and safely, with no downtime and minimal site disruption.
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