The Challenge: Combating Gradual Subsidence

The iconic Bordeaux bridge is facing a significant challenge: gradual sinking. Each of the bridge’s support batteries rests upon 250 wooden stakes. These stakes, though, do not reach the bedrock, leaving them vulnerable to the ravages of time, traffic-induced vibrations, and the relentless currents of the Garonne River. Consequently, the structure is sinking at an alarming rate of 4 to 5 millimeters annually.

This subsidence, if left unchecked, could compromise the structural integrity of the bridge, necessitating urgent intervention. Bordeaux Métropole has recognized the critical nature of the situation and has initiated a extensive reinforcement project.

AEVIA’s Crucial Role: Strengthening the Foundation

The AEVIA company is at the forefront of this vital operation, undertaking the crucial task of reinforcing the bridge’s foundation. A team from Bordeaux Métropole recently documented the initial stages of this work from the Garonne River during low tide, emphasizing its importance in bolstering the structure before more extensive repairs can commence.

crucial to strengthen the structure before major works
Bordeaux Métropole

The Reinforcement Process: A Multi-Phased Approach

The reinforcement project involves a multi-phased approach designed to address the root causes of the sinking and ensure the long-term stability of the bridge. The key steps include:

• Micropile Installation: Sixteen micropiles will be drilled at each battery, extending more than 9.5 meters beneath the bridge. These micropiles will provide a more secure and stable foundation, anchoring the structure to deeper, more solid ground.
• Sealing and Sanitation Repair: A complete overhaul of the bridge’s sealing and sanitation systems will be undertaken to prevent water damage and further deterioration of the wooden stakes.
• Elegency Room Restoration: The elegance rooms within the bridge eardrum will be restored, preserving the ancient and architectural integrity of the structure.
• Erosion Control: Rocks will be strategically placed to limit erosion caused by the river’s currents, protecting the bridge’s foundation from further damage.

Looking Ahead: Ensuring the Bridge’s Longevity

The ongoing reinforcement project represents a significant investment in the future of the Bordeaux bridge. By addressing the underlying issues causing the subsidence and implementing a comprehensive repair strategy, Bordeaux Métropole and AEVIA are working to ensure that this iconic landmark remains a vital part of the city’s infrastructure for generations to come. Similar bridge preservation projects are underway globally, with cities like Venice employing innovative techniques to protect their historic infrastructure from the effects of climate change and aging.