Cases from our journey

Tunnel Joint Experts.

Friction Testing, Omega Seal Installation &
Waterstop Repair

Period

2021-2024

Author

Joel van Stee, Frank Blok

Role

Testing Supervision,
Inspection, and Installation

Client

BAAK EPCM VOF

Engineers & Contractors

Project Scope & objectives

The project involved the supervision, testing, and installation of critical tunnel sealing components, focusing on Omega profile joints and waterstop systems. The goal was to ensure
structural integrity, watertightness, and compliance with

Rijkswaterstaat standards through:

  • Supervision of pressure testing on Omega jointswithin the closure joint.
  • Inspection of concrete surfaces to evaluate quality and compatibility.
  • Friction testing and surface validation for optimal seal performance.
  • On-site supervision and execution of Omega seal installation.
  • Innovative acoustic leakage detection for enhanced validation.
  • Improving lead times for installation and
    commissioning.
  • Collaborating with Rijkswaterstaat for approvals
    and quality assurance

Key Challenges & Solutions

Friction Testing & Surface Validation

The friction testing conducted by Tunnel Joint Experts BV focused on evaluating the interaction between the Omega profile, clamping system, and contact surfaces to ensure stability and resistance to displacement. A series of controlled load tests were performed to measure the friction coefficient under different pre-tensioning conditions, replicating real-world operational forces. The test setup included sensor-based monitoring to capture displacement,
bolt force, and pressure variations during testing. Results indicated that surface conditions and initial bolt pretensioning played a critical role in maintaining the required friction levels. To optimize performance, surface preparation techniques were assessed, ensuring proper adhesion and mechanical grip between components. Adjustments were made to the clamping force and interface materials, preventing slippage and ensuring a secure, load-bearing connection throughout the system’s service life.

Key Challenges & Solutions

Omega Seal Installation & Pressure Testing

Comprehensive inspections were carried out to evaluate the condition of the contact surfaces, ensuring they met the necessary standards for smoothness and bonding capability. Controlled load testing was performed to determine the required friction coefficient, ensuring sufficient slip resistance for the installed components.

supervised and executed the precise mounting of Omega seals, ensuring they were correctly aligned and achieved the necessary compression capacity for optimal performance. Following installation, pressure testing was conducted using acoustic leakage detection, allowing for real-time validation of the seal’s integrity. Any detected inconsistencies in seal compression or surface contact were promptly addressed through corrective measures, ensuring a secure and watertight installation that met project specifications.

Key Challenges & Solutions

Waterstop Repair & Approval Process

Developing a repair method to fix the leakage was essential to ensure the seal’s performance while meeting the longevity requirements set by Rijkswaterstaat. The solution was carefully designed to restore watertightness without compromising the long-term durability of the system. Under the close supervision of Rijkswaterstaat, the repair was executed efficiently within a limited time frame, ensuring compliance with regulatory standards while minimizing operational disruptions. frame.

Key Outcomes & Lessons Learned

  • Friction testing and surface validation ensured that the seals maintained their designed mechanical properties.
  • Innovative acoustic testing provided a faster and more accurate assessment of seal performance.
  • Collaborative approach with Rijkswaterstaat facilitated a seamless approval process and enhanced quality assurance

Key Challenges & Solutions

Recommendations & Future Considerations

  • Implement real-time surface monitoring during future installations to ensure optimal contact conditions.
  • Continue leveraging acoustic detection methods to streamline leakage identification and commissioning.
  • Standardize pre-tensioning protocols for Omega seals to ensure repeatable and predictable performance.
  • Enhance collaboration with regulatory authorities to facilitate future approvals and compliance efforts.

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