Marine Interfaces

Lammebrug ties in-water foundations to a separate control-cable crossing

Published 5 September 2026 Publisher IMWO Region Europe Confidence Confirmed
Conceptual Lammebrug interface for Boskalis N206 works across Rijn-Schiekanaal: basement, central support, bank sheet piles and underwater operating cable

IMWO original Lammebrug interface schematic from dated contractor and project documents; not a design drawing or completed installation

Boskalis separates the replacement Lammebrug basement, support piles, bank sheets and underwater operating-cable crossing into different workfronts. Planned passage restrictions are not evidence of completed foundations or bridge commissioning.

Foundations and cable installation have separate windows

The 27 August contractor bulletin reports initial basement-wall concrete placed on 25 August. It schedules further in-water foundation and bank works during September and October, with weekday navigation restrictions generally 07:00-16:00 from 31 August to 23 October. A dedicated continuous closure is planned from 21 September 07:00 to 23 September 16:00 for the underwater crossing. These windows describe an announced programme, not completed operations.

A movable bridge needs a control connection as well as structure

The crossing carries power and data for bridge operation. Its dedicated access window is distinct from pile, bank and temporary navigation-protection work. Working hours may extend beyond the normal daytime period without that statement itself extending the announced navigation closure. The marine work belongs to the wider N206 Europaweg package, not a newly awarded standalone bridge contract.

Evidence conclusion

The package and permission records have different boundaries

The February 2024 design-team announcement names Boskalis, ZJA and BoschSlabbers and distinguishes the movable Lammebrug, Trekvlietbrug replacement and new Knotterpolderbrug. The July 2025 official notice concerns draft water-structure and municipal permission decisions, not final approval or acceptance. For suppliers, foundation and control-cable workfronts shape access requirements. Public documents establish neither a marine price split nor a named pontoon fleet, pile quantities, accepted installations or a confirmed commissioning date.

Outstanding evidence

  • Reported installation and testing for the control connection
  • Final bridge permission and acceptance records
  • Dated navigation arrangements for separate workfronts
  • Foundation quantities and identified marine equipment

Related records 1

Subject index

Related subjects

These subject pages bring together related projects, technical articles, reports, and evidence methods.

Sources used 4

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