Pykes Creek Bridge Strengthening

Location: Western Fwy, Myrniong, Vic

Client: VicRoads South Western Region

Date: January 2018 – July 2018

 

This project involved two new cross-over pavements and one existing emergency cross-over to be re-surfaced. Once the freeway was closed, works could start on the bridge works and upgrades of the Western Freeway bridge over Pykes Creek Reservoir on the Melbourne bound bridge.

     

ACE Infrastructure Pty Ltd had undertaken steel works on the northern bridge across Pykes Creek. The work goal of the works was to strengthen the existing structure, re-surface the bridge deck, and re-open to traffic.

Delivery Challenges

  • Complex traffic staging around tie in points requiring over 20 individual TMP’s
  • Long lead time for steel manufacture and shipping of TP components
  • Survey challenging using total station, no good PM’s or TBM
  • As-built structure and water level drawings were hand drawn in feet and inches from 1968
  • At time of award, piers 2 and 3 steel were under water, levels had to drop for installation
  • Location of existing steel reinforcement was difficult to pinpoint for dowel installations

Learnings

  • Arbitrary Laser scan of under-side of bridge completed, using new BM’s
  • Scaffolding and pontoons were used to access the under-side of bridge (normal scaffolding not practical)

Environmental Management

  • Measures were taken to protect Pykes Creek from runoff and spillage from the scaffolding and pontoons under the bridge.
  • Impact on water levels was kept to a minimum by extracting data from the past 8 years of water levels and timing works to coincide with the usual drop in water during December to March.