Together with sub-contractor Gammon Construction Limited, the three contractors are relying on 17 Liebherr duty cycle crawler cranes plus a LR1280 lattice boom crawler crane to construct more than 2600 m of 1.20 m thick diaphragm walls and barrettes over a distance of 900 m.
The wall is being fabricated to depth varying between 45-70 m and incorporates massive reinforcement cages which are being lifted with multiple crane lifts.
Fabricated in China, the precast units were delivered to Hong Kong on a semi-submersible ship and floated into position.
In total, more than 900,000 m3 of material has been dredged using conventional grab dredges and split hopper barges.
With the project located in Hong Kong's harbor, control of sediment during the dredging works was an important issue, requiring the development of silt curtains around the active work areas.
The Liebherr HS 885 HD duty cycle crawler crane is considered one of the most versatile units of its type, accepting a wide variety of attachments making it eminently suitable for a large number of applications.
Offering a power rating of 612 - 911 hp (450 - 670 kW), the crawler crane may be equipped with a main boom of up to 74 m in length and features a maximum lifting capacity of up to120 t at 3.8 m radius.