This Cross Bay Link is a strategic 1.8 kilometre road link with a dual two-lane carriageway, cycle track and footpath. The infrastructure project seeks to enhance connectivity within Tseung Kwan O as well as between Tseung Kwan O and Kowloon via the Tseung Kwan O – Lam Tin Tunnel, which is under construction.
The project provides a direct strategic link for vehicular traffic, allowing substantial reduction in travelling time and carbon emissions, further contributing to decarbonisation. Moreover, it also constitutes a vital section of a 5-kilometre coastal walkable and cycling loop to advocate healthy and sustainable non-vehicular travelling modes.
DOUBLE-ARCH STEEL BRIDGE ASSEMBLY
The marine viaduct consists of 12 spans, nine of which are concrete box girders and three steel decks. The lengths of the concrete spans range from 46 to 75 metres. Extensive prefabrication was adopted, covering various elements from pile cap shells and piers to whole bridge decks. Most of them were erected on-site by the whole-span lifting method, except the steel decks, which were constructed innovatively by the float-over method.
While the concrete decks’ erection of 3,300-tonne maximum weight apiece was achieved by carefully controlled lifting, the erection of the double-arch steel bridge was one of the challenging tasks as the structure weighed over 10,000 tonnes. However, every process was planned with foreseeable risks duly controlled throughout the delivery to on-site assembly at Junk Bay.
For the float-over method, the steel decks loaded on a semisubmersible barge were carefully moved between the piers at an optimal time slot, taking into account tidal and environmental conditions. Delicate manoeuvring and ballasting then allowed precise deck positioning and load transfer.
This is an excerpt. The original article is published in Construction+ Q2 2022 Issue: Technology & Innovation.
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Cross Bay Link, Tseung Kwan O
Tseung Kwan O
Status of Construction
Civil Engineering and Development Department, the Government of the Hong Kong Special Administrative Region
AECOM Asia Co Ltd
China Road and Bridge Corporation
Civil Engineering and Development Department