Project: Buisleidingenstraat

Client:LSNed

Role: Tunnel Joint Experts BV – Inspection, Analysis, and Reporting

Period: 2024

Author: Joel van Stee, F. Blok

Keywords: Residual Lifetime Determination (RLD), LSNED, tunnel joints, Omega profile, Gina seal, joint degradation, structural integrity, corrosion mapping, rubber elasticity, clamping system, anchor bolts, water tightness, deformation monitoring, LIDAR scanning, endoscopic inspection, pressure validation, steel loss assessment, predictive maintenance, joint movement tolerance, digital modeling, sensor-based monitoring, lifecycle extension, underground infrastructure, pipeline tunnel maintenance.

1. Problem Statement

The tunnels at Oude Maas and Hollands Diep are critical infrastructure elements facilitating underground pipeline transport. Over time, tunnel joints and sealing systems experience degradation due to environmental conditions, aging materials, and corrosion. LSNED required an extensive assessment to determine the residual service life of the tunnel joint systems, including Omega profiles, Gina seals, and clamping mechanisms.

Previous inspections had highlighted concerns related to corrosion of steel components, elasticity loss in rubber seals, and potential displacement of sealing profiles. The goal of this phase was to establish a comprehensive baseline assessment to guide future maintenance and potential renovations.

2. Solution

The study followed a Residual Lifetime Determination (RLD) methodology, integrating visual inspections, deformation monitoring, material sampling, and structural analysis. The approach aimed to:

Develop a 3D model for structural analysis and predictive assessment of future degradation.

Identify critical degradation points in the tunnel joints.

Evaluate the mechanical integrity of the Omega seals and their clamping systems.

Assess the impact of corrosion on steel components such as anchor bolts and clamping strips.