Large Excavation / Turnkey Operations / Shaft Sinking

Hats 2A

Hats 2A


Scope of Works

Vertical excavation works for the Harbour Area Treatment Scheme 2A (HATS 2A), including:

  • Blind sinking 4 shafts ranging from 8m to 12.5m diameter to a depth of 180 metres, establishing off shaft drives and Raise drilling of 7 pipe shafts from surface to underground
  • Designing and fabrication of shaft mucking system to WA Mining Regulations standards to suit both the initial shaft excavation and subsequent tunnel waste rock removal
  • Shaft sinking by hand held methods to a depth of 180m below surface
  • PEG (Pre Excavation Grouting) to 70 bar undertaken systematically during shaft and tunnel advance to prevent water inflows
  • Off shaft development to establish hoisting system and tunnel rail systems
  • Installation of shaft steelwork, services and ventilation ducts
  • Housing al operations within a sound attenuating enclosure

Installing and commissioning automated hoisting system for tunnel rock extraction.

  • Gammon Construction | Drainage Services Division  Hong Kong SAR.