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December saw the culmination of an ambitious $188m expansion project at ASRY in Bahrain, with the official inauguration of a 1,380km repair quay wall.
The new 1.38km repair quay wall at the Arab Shipbuilding & Repair Yard Company (ASRY) in Bahrain has made innovative used of gravity-wall construction and precast blockwork to ensure a maintenance-free structure, according to the company.
The project was designed by engineering consultancy Royal Haskoning of the UK, a specialist in shipyards, ports, dock, terminals and associated marine facilities. The contractor was local Bahraini company Nass Contracting.
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The extent of the services we offer encompasses every aspect of shipyard consultancy, from feasibility studies through conceptual design and masterplans to detailed design and specifications, said Syd Bell from Royal Haskoning in Bahrain.
Bell explained that, with the ASRY project, Royal Haskoning was awarded an EPC contract, from concept to tender documentation. It was also responsible for reviewing the contractor’s designs and supervising construction.
The new repair quay is supported by a 200,000m2 hard-standing offshore fabrication area and load-out quay. It is located north-east of the existing yard, in an area known as ASRY Basin. It has an alongside depth of 12m, and can simultaneously handle three 300,000DWT (deadweight ton) vessels.
Bell commented that gravity-wall construction “requires competent underlying strata. In addition, the seabed needs to be prepared to provide a level and stable platform for the placing of the precast concrete blocks.
Where the soil conditions are favourable, construction of quay walls using precast concrete blocks proves to be attractive in terms of economy and long-term durability.
The precast blockwork wall is considered a better form of construction than on-site casting, due to the fact that the concrete blocks can be formed to a much higher quality. These walls are typically formed using solid precast blocks, but hollow sections are also applicable, and often prove more economical.
Once placed, hollow-core precast blocks are tied together by filling all, or part of, the hollow-core with nominal steel reinforcement and concrete. Scour protection is necessary around the toe wall to prevent the undermining of the toe to the wall from the action of propellant scour.
“The key advantage of a gravity-wall type repair quay is that the units are constructed in the dry, under controlled conditions, using structurally-reinforced concrete,” explained Bell.
“A high degree of quality control can therefore be attained, which will help ensure that the required design life is achieved, without specific protection methods.”
In addition, German crane manufacturer Ardelt has been selected to design, build and install two new cranes for the repair quay wall. Both new cranes, a Kranich 1000-47 and a Kranich 1000-28, will be installed in March 2012. They are of the level luffing type, running on rails, from Ardelt’s Kranich single-jib range.
These are lightweight, flexible units, offering extremely low maintenance, and tailored to the demanding requirements of ship repair, as well as offshore rig repair and installation work. ASRY already operates a Kranich 500 on one of its two large floating docks.
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