NORTH SHORE PUMP STATION

Phase 1: North Shore Pump Station (Lions Gate Bridge)

Henry Foundation Drilling Inc. (HFDI) was contracted to execute the comprehensive design-build shoring scope for the new North Shore pump station, strategically positioned directly underneath the historic Lions Gate Bridge.

Collaborating closely with the client, HFDI engineered a highly cost-effective and structurally advanced design consisting of a circular secant pile compression ring adjoining an internally braced secant pile shaft.

  • Geotechnical & Hydrologic Challenges: Located less than 100 meters from the ocean, the project faced exceptionally difficult soil profiles consisting of dense sand, gravel, and heavy glacial boulders. With the groundwater table sits less than 3 meters below the working elevation, a highly robust, water-impermeable shoring structure was critical.

  • The Engineering Solution: HFDI designed and installed a specialized temporary secant pile wall in a custom "keyhole" configuration. The secant piles were advanced well below the 12-meter deep excavation floor elevation to anchor the structure and prepare for deep foundation support.

  • Marine-Grade Deep Excavation: HFDI utilized a heavy-duty Liebherr HS895 duty cycle crane to safely excavate the internal structure underwater.

  • Massive Tremie Slab Pour: To seal the foundation, a massive 1,600m³ underwater tremie slab was successfully poured in a continuous 8-hour window. This high-intensity operation coordinated three cranes managing tremie pipes and three concrete pump trucks simultaneously.

  • Structural Execution: All reinforcing steel installation and internal bracing strut placement were self-performed by HFDI under a complex, multi-step build-out sequence meticulously organized with the client.

Phase 2: Wastewater Conveyance Access Shafts (Shafts 2, 6, 8, and 9)

Following the success of Phase 1, Henry Foundation Drilling Inc. was trusted to design and construct the temporary structural shoring for the new pump station expansion along with eight (8) specialized access shafts.

This critical infrastructure phase facilitates the installation of sub-surface conveyance piping designed to transfer wastewater efficiently from the existing Lions Gate Wastewater Treatment Plant to the state-of-the-art North Shore Wastewater Treatment Plant.

  • High-Risk Urban Execution: Multiple deep shaft excavations were executed with extreme precision, operating within mere feet of an active, high-pressure 2.1-meter water pipeline.

  • Utility & Transport Constraints: Structural shoring and drilling operations were successfully navigated in immediate proximity to active railway tracks and tightly hemmed in between critical underground municipal utility services.

  • Construction site near a body of water with a large yellow crane, scaffolding, and building materials, with a bridge overhead and a city skyline in the distance.
  • Construction site by the water with a crane, circular underground structure, and construction materials, with a coastline and water in the background.
  • Construction site with a large circular structure being built, surrounded by construction equipment, materials, and vehicles.
  • Construction site with three small storage buildings, construction tools, and equipment near a railway track.
  • A construction site next to railway tracks with a large green structure and multiple vehicles parked nearby.
  • A construction site with a partially built rectangular swimming pool surrounded by dirt and construction materials, viewed from above.
  • An aerial view of a construction site with a yellow drilling machine, scattered construction materials, and nearby parked vehicles and buildings.
  • Construction site with a crane lifting a large pole, surrounded by construction materials, equipment, and small vehicles, with trees and mountains in the background.
  • Construction site with a large metal roof, a deep excavation, and construction machinery, near train tracks and a river with a bridge in the background.