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Wassara helps keeping the Costa Concordia wreck in place

The first part of the Costa Concordia salvage project is now complete.

The first part of the Costa Concordia salvage project is now complete. Anchor points have been installed in the seabed, keeping the wreck from sliding further down the slope during the lifting process. Wassaras water-powered drilling technology was the given choice for this delicate project. More anchoring points will now be added, securing the wreck before winter.

On Tuesday, September 17, the turning and lifting of the Costa Concordia wreck was completed. The first major part of the salvage project was a success as everything went according to plan. The two worst-case scenarios never came to pass; the wreck didn’t fall apart and it didn’t roll over to the other side during the lift. It now sits on the under-water platform that will carry the cruise liner while the external caissons are mounted on the starboard side of the wreck. Anchor blocks have been installed in the seabed to keep the wreck from sliding further down the slope during the lifting process.

Costa Concordia is located in a Marine National Park that comprises a highly sensitive seabed. The water-powered drilling technology was the given choice for this delicate project. As it doesn’t introduce any oil or risk of pressurizing of the formation, it’s proven to be optimal for drilling in sensitive formation.

Mr Maurizio Siepi, Senior Technical Advisor at TREVI SpA, describes the drilling project:
- “Wassaras DTH hammer W150 has been used for the installation of the 11 anchor blocks, positioned on the land side of the wreck. Each anchor block is formed by 10 anchors bars 63 mm in diameter, and is positioned underwater at a depth ranging from 8 to 15 m. The drilling rig was mounted on a special vessel, together with all the necessary equipment to install the anchor bars and grout the holes.

The anchor holes were drilled in the granite, to a depth reaching the 12 and 16 meters. Each bar was tested and tensioned at 192 tons and tight at 175 tons.”

Wassaras Italian distributor, Ripamonti, has supplied the on-site technical support. Mr. Ambrogio Ripamonti is the General Manager at Ripamonti:
- “We have been able to supply the technical support to the drilling team on a 24/7 basis. As the drilling has been running under a tight time plan, there has been no room for discontinued operation. We are very happy with the fact that the drilling kept the time plan.”

The next part of the drilling project will include a seabed survey to precisely determine the composition and the construction of an additional anchor system. The anchoring system will secure the wreck before winter, when sea storms can put at risk the already precarious stability of the wreck.


Wassaras W150 about to start the drilling of a new hole.


The salvage of Costa Concordia.

 

 


The salvage operation in short
1. The ship is secured to the anchor points.
2. A platform is constructed.
3. Large floating pads of steel, filled with water are attached to one side of the ship.
4. The ship is erected to stand on the platform.
5. Large floating pads of steel are attached to the other side of the ship.
6. The water is pumped out from the floating pads. The ship will now float and can be towed away for scrapping.

About LKAB Wassara

Wassara offers the mining and construction industry products for effective drilling in soil and rock, based on our core competence in water-powered drilling. The heart of all the systems is the patented Wassara hammer which is powered by high pressure water. Wassara was founded in 1988 and is a subsidiary to the Swedish mine company LKAB.

Editorial contact:
Kent Boström, Communications manager
kent.bostrom.wassara@lkab.com
Phone: 08-429 34 15

Additional information about this release:
High resolution photos and detailed illustrations can be downloaded from this URL.