Extension of Quay 33 & 34. Port of Rønne | Bornholm | Denmark

Quay 33 & 34 extension project at Port of Rønne

Rønne is the largest city on the island of Bornholm in Denmark, with a population of around 14 000 inhabitants. The island lies eastern of Copenhagen, in the Baltic sea, and is a popular holiday escape for Scandinavian residents, fond of the sandy beaches and the sunny weather in summertime. Rønne’s port is the largest on the island and had as many as 32 quays in operation before its extension, which consisted in the construction of a breakwater and two quay walls in a new zone of the port.

The 1 150 m long new breakwater was built first, and the new quay walls, which were inaugurated in October 2019, are Quay 33, a heavy-duty quay, and Quay 34, a multipurpose quay. Both have a dredge line at -11.0 m during the first operation phase, but the final design water depth is -13.0 m. Quay 33 is around 280 m long, whereas Quay 34 is 300 m long and can accommodate cruise ships up to 350 meters. A 60-meter-long Ro-Ro ramp connects the two quay walls. 

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Typical cross section Port of Rønne
Port of Rønne
Port of Rønne
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The solution of the main wall consists of an HZ®/AZ® combined wall system: king piles HZ 1080M A-12 in S 460 AP (mill specification), HZ 880M A-12 in S 430 GP and infill sheet piles AZ 26-700 in S 355 GP. The lengths of the HZ®-M vary from 9.9 m up to 21.8 m and the AZ® infill sheets from 9.1 m up to 17.1 m. 

Portions of the two return walls were built with AZ 26-700 and AZ 28-700 in S 355 GP and S 430 GP, in shorter lengths (7.9 m to 14.9 m). A total of 2 611 tonnes of steel sheet piles were delivered to Rønne by vessel directly from the rolling mills in Luxembourg.

The soil is composed of hard sand, followed by hard clay from early Jura period. The backfill was made with approximately 900 000 m3 of sand that was further compacted. The finishing layer of the structure consists of compacted gravel, except along the quay wall border where it is made with a concrete pavement.

Per Aarsleff installed the steel sheet piles and anchors. The HZ-M king piles were installed at a rate of 24 piles a week, with a peak at 8 piles per day, and the AZ infill sheet piles at a rate of 36 double piles a week. It is noteworthy to mention that due to bad weather conditions, the contractor had a downtime of about 40%.

The driving of the AZ sheet piles was performed with a vibratory hammer PVE VM 40 and a free-hanging hydraulic impact hammer IHC S90 (ram weight of 4.5 tonnes) to drive to the final elevation. The HZ-M king piles were driven with a vibratory hammer ICE 1412C and an impact hammer Juntan HHX 160 / HHK 12S (ram weight of 12.0 tonnes). The installation took place from a jack-up barge.

The dredging company Rohde Nielsen dredged some 700 000 m3 of material from the bottom of the sea to secure the 11 m water depth.

The first vessel to berth in the new quay was the MV Braemer, a cruise ship, on June 4, 2019.

Total cost of the infrastructure contract: 533 million Danish Krones (approx. 72 million Euros).