Vietnam’s longest sea crossing bridge at Lach Huyen
The new Lach Huyen deep sea port near the city of Hai Phong in the Gulf of Tonkin is one of the most important infrastructure projects that is currently under construction in Vietnam. Lach Huyen will be the first international port in the north of the country and will be able to handle container vessels with capacities of up to 100,000 t.
The project also includes the construction of a 15.63 km long highway that will connect the eastern districts of Hai Phong with the harbour, Dinh Vu Industrial Park and the expressway to Hanoi. The highway incudes 10.19 km long and 29.5 m wide access roads and the 5.44 km long and 16 m wide Lach Huyen Bridge.
One of the longest bridges in Southeast Asia
Lach Huyen Bridge is the longest sea-crossing bridge in Vietnam and one of the longest bridges of its kind in Southeast Asia. With four lanes and two emergency lanes, Lach Huyen Bridge both crosses the 500 m wide sea canal and the Bach Dang River and Cam River estuaries. Construction work began in February 2015 and was expected to be completed by early 2017.
500,000 m³ of sand used to reclaim land
For the construction of the bridge structure, 500,000 m³ of sand was used to reclaim land for two 26 m wide and 4.1 km long working platforms. The 88 bridge spans are supported by pile structures. Each pier is supported by 16 reinforced concrete piles with exterior diameters of 1.3 m and lengths of up to 46 m.
As a subcontractor, DYWIDAG-Systems International SPP – ASIA Ltd. supplied external strand tendons with 1,320 MA anchorages and internal strand tendons with 2,292 MA anchorages for Lach Huyen Bridge. As part of the subcontractor services, DSI also provided site supervision and the rental of 20 post-tensioning jacks including hydraulic pumps. This includes 10 HOZ 5,400 kN stressing jacks that were equipped with a special changing device redesigned to accommodate epoxy coated strand.
In this project, epoxy coated strand produced and supplied by Sumitomo for external post-tensioning tendons was used for the first time outside of Japan.