Our Services

Overview

Elidrissimasarl offers a comprehensive suite of services for marine and offshore construction. Our expertise covers the full project lifecycle, from initial studies and design support to execution and commissioning.

 
 

 

 

Offshore Seawater Intake & Outfall Systems

We specialize in the design, construction, and installation of critical seawater intake and outfall systems for desalination plants, power plants, and industrial facilities.

Capabilities:
  • Site assessment and feasibility studies.
  • Detailed engineering and design of intake towers, headwalls, and pipeline systems.
  • Construction of intake structures using materials like HDPE/GRP.
  • Precision installation of offshore structures, including multi-tonne intake towers.
  • Connection to onshore facilities.

Dredging, Rock Removal & Seabed Preparation (Dragage / Deroctage)

Elidrissimasarl provides expert dredging and seabed preparation services, crucial for the foundation of any marine structure and for creating navigable access.

Capabilities:
  • Pre-dredging surveys and volumetric calculations.
  • Dredging to specified depths (e.g., achieving levels like -25.30m NGM as shown in typical projects).
  • Rock removal and de-roctage for trenching and foundation stability.
  • Seabed levelling using gravel and other materials.
  • Creation of trenches for pipelines and TBM recovery.

Prefabrication of Marine Structures (Prefabrication des Tours de Prise)

Our capabilities include the onshore prefabrication of large-scale, complex concrete and composite marine structures, ensuring quality control and optimized installation timelines.

Capabilities:
  • Dedicated prefabrication yard setup and management (referencing the need for significant areas, e.g., >1000 m²).
  • Casting of high-strength concrete elements such as intake tower sections (base slabs, risers, top slabs).
  • Fabrication of associated components (e.g., screens, supports).
  • Quality assurance and control throughout the prefabrication process.
 
 

 

 

Transport & Installation of Prefabricated Elements (Transport des Elements Prefabriques, Installation des Tours de Prise)

We manage the complex logistics of transporting and installing heavy prefabricated marine structures with precision and safety.

Capabilities:
  • Heavy lift planning and execution.
  • Marine transportation using barges and specialized vessels.
  • Deployment of buoyancy systems (e.g., using flotation devices like SEAFLEX or similar) for controlled lowering.
  • Subsea positioning and final placement of structures.
  • Installation of rock protection and backfill materials.
 
 

 

 

Subsea Tunneling Support & TBM Recovery (Recuperation des Tunneliers TBM)

Elidrissimasarl offers specialized services supporting subsea tunneling operations, including the critical phases of Tunnel Boring Machine (TBM) breakthrough and recovery.

Phased Approach Expertise:
  • Phase 1: Pre-dredging Works: Preparing the TBM reception pit.
  • Phase 2-3: Structure Installation & Backfilling: Installing reception structures (like intake towers) and backfilling trenches.
  • Phase 4: TBM Breakthrough Support: Managing the final drilling and breakthrough sequence.
  • Phase 5: Dredging for TBM Recovery: Precise material extraction to expose the TBM.
  • Phase 6: TBM Recovery: Planning and executing the safe lifting and retrieval of the TBM.
  • Phase 7: Ancillary Module Recovery: Retrieval of associated equipment like rescue modules.

Offshore Pipeline & Connection Works (Connexion Tours/Tunnels)

We provide solutions for the connection of offshore structures to subsea tunnels and pipelines, ensuring secure and durable links.

Capabilities:
  • Installation of jacking pipes and specialized connection pieces (spool pieces).
  • Subsea metrology and precise alignment.
  • Diver and ROV assisted operations for connection and sealing.
  • Final backfilling and protection of connection zones.
 
 

 

 

Project Management & Engineering

Our experienced project management teams ensure that every project is delivered on time, within budget, and to the highest quality and safety standards. We offer comprehensive engineering support, from feasibility to detailed design review and construction supervision.