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Ground improvement works for Tynybryn bridge

Challenge

Weak and variable ground conditions beneath Tynybryn Bridge required strengthening to ensure long‑term structural stability without extensive excavation or prolonged closure.

Solution

Geobear delivered precision geopolymer injection to improve soil strength, increase bearing capacity and stabilise foundations with minimal disruption.

Bridge infrastructure asset

Ground improvement beneath structural elements

Targeted in situ strengthening

No bulk excavation required

Rapid curing material

Minimal programme impact

Background

Ground investigations at Tynybryn Bridge identified zones of reduced bearing capacity beneath key structural areas. Without intervention, continued settlement risked affecting long‑term performance and serviceability.

Given the operational and logistical constraints typical of bridge assets, the remediation approach needed to be efficient and minimally invasive.

Challenge

Traditional excavation and foundation reconstruction would have involved significant plant access, environmental impact and extended programme duration.

The client required a controlled method of strengthening the ground in situ while maintaining safety and reducing disruption.

Solutions

Geobear implemented a designed geopolymer injection programme to enhance the mechanical properties of the underlying soils.

Small‑diameter injection tubes were installed at defined depths to introduce a two‑component geopolymer beneath the affected areas. The material expanded on mixing, filling voids, densifying loose strata and increasing stiffness within the treated zone.

Injection was monitored in real time to ensure uniform improvement and protection of the bridge structure.

Results

Ground stability and bearing performance were improved without intrusive reconstruction.

The works were delivered efficiently, providing a durable and lower‑carbon alternative to traditional strengthening methods while safeguarding long‑term bridge performance.

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