Sea Works: Case History

Qatar, Ras Laffan – Project and construction of the harbour E-mail


Project and construction of the harbour of Ras Laffan
The Company, together with other firms has started the construction of the harbour of Ras Laffan in Qatar that is included in the project for the construction of the installation to treat the hydrocarbons of the North Field reservoir.
The harbour, mainly used for the export of liquefied natural gas is located on the North- East of the State of Qatar.
The project, featuring a sticker price, includes the design and the construction of a modern harbour that stretches in the sea for about 5500m.
This structure is protected by a main dam that is 6.100 m long and a second one that is 5.000 m long.
The quantity of used materials corresponds to 4.400.000 cubic meters while the quantity of Antifer type artificial concrete rocks that are used corresponds to 360.000 cubic meters.
The harbour’s access channel is 5.800 m long from the entrance to the harbour and it is dredged at a depth of -15,00 m. The internal basin is 2.000.000 square meters wide and it is dredged at a depth of -13,50 m.
The materials derived from the dredging, corresponding to 8.000.000 cubic meters is used for the 1.300.000 square meters of the internal store yards.

Grandi Lavori Fincosit is responsible for the following works:

- 2 LNG terminals (up to 4) for the loading of the gas tanks of 130.000 cubic meters.
-2 terminals Liquid cargo (up to 6) for the ships up to70.000 dwt.
- terminal dry bulk and container for a final development of 950 m.
- 1 terminal Ro-Ro/Heavy Load.
- 1 dock for 270 m. long tug boats
- terminals’ wharfs for a whole development of 2.000 m.

The concrete mixing system of GLF, for the production of all the needed types of concrete to carry out the works (around 550.000 cubic meters), has got a production capacity of 2.000 cubic meters per day. It is equipped with an installation for the production of ice and for the concrete cooling with a capacity of 40 cubic meters per day and a chiller for the production of cooled water at +5°C with a capacity of 10 cubic meters per hour.
The production of concrete comply with the results of the complex studies concerning the control of the concrete hydration heat and curing aiming at preventing the micro-flaws in the prefabricated structural elements since the air temperature during the casting and maturation can reach 50 centigrade degrees.
The LNG terminals and the liquid ones as well as the Dry Bulk docks and the containers Heavy load and Tug are made with huge concrete rocks with a single weight up to 450 tons.
These structures built by means of a consolidated construction technique developed by the company are suitable for the very aggressive environment of the Gulf since they provide a high duration guarantee.