Douglas Arterial Duplication Watermain

Project Description / Overview:

CivilPlus were engaged to construct a replacement section of the 1050dia Water main under the Douglas Arterial Road for the Duplication Works. This involved the installation of a 1200dia enveloper under the overpass embankment (84m) and installation of the 1050dia water main through the enveloper and open excavation sections (184m total). Challenges were the 6m deep exit pit within a tight road shoulder that required the construction of a cofferdam with sheet piling.


Abigroup / Seymour

Project Features:

  • Service Location
  • Engineered Sheet piling,
    Coffer dam Exit Pit.
  • Tunnel bore and enveloper
    installation (84m)
  • 1050 MSCL water main
    installation (184m)
  • Working in the vicinity of
    HV power lines
  • Tie inn to existing water