Part of the seawall structure of the Hong Kong-Zhuhai-Macau Bridge Hong Kong Boundary Crossing Facilities project was changed from steel cellular seawalls to rubble mound seawalls due to changes in the airport runway’s closure timetable.
Responding to media enquiries, the Highways Department said due to height restrictions near the airport, large equipment used in constructing steel cellular seawalls could not gain access to some of the locations until the restriction is lifted during the closure of south-north runway.
The construction schedule for part of the steel cellular seawalls, therefore, had to tie in with the timetable of the south-north runway closures at the airport.
The department noted that the timetable of runway closures has been changed since the reclamation works started, further affecting the construction schedule.
The contractor thus suggested changing part of the steel cellular seawalls in the western and southern sides of the artificial island to rubble mound seawalls in 2013.
The suggestion was scrutinised according to contract agreements.
The department accepted the proposal after considering that the construction time would not be extended while the cost would not be increased.
It noted that both methods of construction are “non-dredged” and environmentally friendly.
After the amendments, the 5.1km-long steel cellular seawalls and the 1km-long rubble mound seawalls were changed to 3.6km-long and 2.5km-long.
The department had consulted the Environmental Protection Department on the amendments. The EPD accepted that the amendments involved no change to the environmental impact assessment report and no variation was required.