How To Repair Bridge Transitions Using Polyurethane

Introduction

Bridge transition slabs are crucial for ensuring a smooth and safe approach to and departure from a bridge. When these transition slabs settle, it can lead to several problems including uneven surfaces, vehicle damage, and overall deterioration of the roadway and bridge structure. Transportation departments and engineers face the challenge of repairing these transitions efficiently while minimizing disruptions to traffic and community activities. Geotechnical polyurethane injection emerges as a viable solution, balancing timeliness, longevity, and cost-effectiveness.

Understanding Bridge Transition Settlements

One primary cause of bridge transition settlement is the failure of the bridge abutment, which leads to the loss of structural fill intended to support the approach slab. Continuous vibrations from traffic and erosion from rain can weaken the fill, causing it to subside and fail to support the transition slab adequately. This results in void formation and slab settlement, creating the need for effective repair solutions.

Applications of Geotechnical Polyurethane

Geotechnical polyurethane has a wide range of applications in highway infrastructure, including:

- Bridge Transition Realignment

- Roadway Leveling

- Road Base Stabilization

- Manhole Soil Stabilization

- Mechanically Stabilized Earth (MSE) Wall Stabilization

- Void Filling

- Culvert Repair

Geotechnical Polyurethane Injection

Geotechnical polyurethane injection is a technique that involves injecting highly dense, lightweight polymers into the soil to densify and stabilize it. Products like EagleLIFT’s EL Polymers are specifically formulated to interact with weak soils, restoring their load-bearing capacity and protecting against future erosion.

Process Overview

1. Assessment and Planning:

- Conduct a thorough site assessment to identify the extent of settlement and voids.

- Plan the injection points and depths based on soil conditions and structural requirements.

2. Injection Procedure:

- Drill small holes (no larger than a penny) through the slab to access the weak soil underneath.

- Use a multiple-depth gridded injection approach known as Deep Stratum Injection.

- Inject the polyurethane at various depths to ensure comprehensive soil densification.

3. Polyurethane Curing:

- The injected polyurethane expands to fill voids and stabilize the soil.

- It cures to 95% capacity within 25 minutes, allowing for rapid stabilization and lifting of the slab.

4. Leveling the Slab:

- Use the expanding polyurethane to lift and level the approach slab to its original grade.

- Monitor the leveling process to achieve precise alignment.

Benefits of Using Geotechnical Polyurethane

- Speed and Efficiency: Repairs can often be completed within hours, typically during non-peak hours to minimize traffic disruption.

- Minimal Intrusion: The process requires only small access holes, reducing the impact on the existing structure.

- Longevity: Polyurethane provides long-term stabilization, reducing the need for frequent maintenance.

- Cost-Effectiveness: The quick curing time and minimal equipment requirements make it a cost-effective solution.

Case Study: EagleLIFT's Experience

EagleLIFT has a proven track record of working with transportation departments in California, Arizona, and Nevada. Our extensive experience includes implementing safety procedures, maintaining necessary licenses and insurance, and completing projects quickly and efficiently.

Project Example:

In a recent project, EagleLIFT successfully stabilized and lifted a bridge transition slab using geotechnical polyurethane. The project was completed within a few days, significantly reducing downtime and restoring the roadway to a safe and functional state.

Conclusion

Geotechnical polyurethane injection is an effective method for repairing bridge transitions, providing a durable and quick solution with minimal disruption. If you have a bridge transition project requiring attention, EagleLIFT offers expertise and proven methods to achieve your goals efficiently and cost-effectively.

Contact Us: To learn more about our services or discuss a specific project, contact EagleLIFT today and explore how we can assist with your infrastructure repair needs.

877-752-2522 | www.eaglelifting.com