Rock Revetment Works

Rock revetment is applied to protect shores against tidal and wave actions.In land reclamation projects, first a breakwater is formed with the supplied rocks marking out the circumference of the island. Subsequently, the island itself is reclaimed with sand using various techniques.In some cases, newly created land is given extra protection by the creation of a breakwater, for instance in ports or around the Palm Island in Dubai.

Jan De Nul Group started to specialise itself in this activity following the large-scale reclamation projects from the beginning of the 21st century.The group invested in R&D and in the construction of the necessary equipment.The stock of dry equipment and the fleet of split hopper barges was expanded considerably.

 

U.A.E., Palm Island II in Dubai

Reclamation Works for the Offshore Creation of an artificial Island in a Palm Tree's Shape - Palm Island
Rock Revetment and Installation Works for the Crescent (Breakwater)

Reclamation Works for the Offshore Creation of an artificial Island in a Palm Tree's Shape - Palm Island
Rock Revetment and Installation Works for the Crescent (Breakwater)

Key figures
Country

Dubai (U.A.E.)

Client's name

Palm Island Development (Nakheel)

Contractor's role

Main Contractor

Period
April 10, 2002 to May 28, 2008

France, Port facilities for a future LNG Terminal at the Western Outport Dunkirk

Construction of the port facilities for a future LNG terminal

 

Construction of the port facilities for a future LNG terminal

 

Key figures
Country

France

Client's name

Grand Port Maritime de Dunkerque

Contractor's role

Joint Venture Partner (Part JDN 76.2 %)

Period
December 30, 2011 to August 30, 2013

Qatar, Ras Laffan Port Expansion Project

The Ras Laffan project, located 80 km north of Doha, Qatar was one of the largest maritime engineering projects in the world. Over a period of three years the largest LNG harbour in the world was...

The Ras Laffan project, located 80 km north of Doha, Qatar was one of the largest maritime engineering projects in the world. Over a period of three years the largest LNG harbour in the world was created.  A joint venture with the Jan De Nul Group executed the works, increasing the size of the existing harbour from 106 km² to 246 km². The works included the deepening of the entire harbour in order to facilitate the biggest LNG carriers and the construction of the surrounding breakwaters with a total length of more than 10 km.

 

Key figures
Country

Qatar

Client's name

Qatar Petroleum (QP)

Contractor's role

Joint Venture Partner (part JDN: 50 %)

Technical specs
Scope

Dredging, land reclamation, hauling of sand and construction of breakwaters and quay walls, construction of Accropodes

Equipment

Cutter Suction Dredgers: J.F.J. De Nul, Marco Polo
Split Hopper Barges: Magellano, Verrazzano, Weseltje, Nijptangh, L’Aigle
Backhoe Dredger: Jerommeke
Liebherr 1300, batching plant, long boom excavators, concrete mixers, trucks
Equipment concrete works:
Liebherr 1300, batching plant, long boom excavators, concrete mixers, trucks

Soil

Sand, limestone, strong to very strong rock

Volume

25,000,000 m³ capital dredging in limestone, moderately strong to strong rock + 25,000,000 m³ mainly sand borrowing complemented with reclamation with quarry fill

Quay wall

Precast blocks > 80 ton/piece
3 separate quay walls, total 10,000 m³ of concrete + 2,000 m³ reinforced concrete

Reclamation

30,000,000 m³

Rock works

Breakwater construction: 21 km plus 12 km of causeway
Height breakwater: max 22-23 m
Width breakwater: max 180 m
Rock: 39,000,000 tonnes
Antifer blocks, accropode blocks: 700,000 m³
In-situ concrete: 300,000 m³
Total installed armour rock weight : 7,600,000 tonnes
Total installed weight (incl. reclamation) : 26,200,000 tonnes

Dredging depth

-13.5 m and -15.0 m