Boskalis Nordic Today 02 2019-2020

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Port of Rauma Ltd is expanding its Ulko-Petäjäs area with a new harbour field. The Petäjäs 4 project will be implemented through seaward rock-filling, which will expand the area of the port by six hectares.

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and versatile grab dredger Kahmari 2 is being used in the dredging. According to the work stages, the vessel uses both clos- able environmental and soft dredging mass buckets. Also available is a claw bucket for use in lifting rocks. Terramare’s four tow- able SCG barges are being used for trans- porting the dredging masses. “The dredging masses, consisting mainly of clay, will be transported and used for fill- ing at Järviluoto Island, located just off the port. It is also currently the place where vis- itors are recognised by their muddy boots and legs,” says Pöyhönen with a smile. MASSIVE ROCK-FILLING WORK “Following relatively substantial dredging, we will then move on to sea-filling itself, which will be carried out using rock waste transported by sea and land. The volume of rock waste to be used for sea-filling is over 800,000 m 3 , for which up to 20,000 truck loads will be needed for the portion to be transported by land. The rock waste brought by sea will go more quickly be- cause the capacity of one loading vessel is equivalent to over 20 truck loads,” says Pöyhönen. Erosion protection will also be construct-

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The rock-filling will be done in coopera- tion with local contractors. Naturally, we will try to operate in terms of dredging and massive rock waste transports so as to minimise disruption to port activities as much as possible. As far as the contract is concerned, we have an interesting and comprehensive project ahead of us,” con- cludes Pöyhönen.

ed for the rock-filling of the Petäjäs 4 area. The completed rock fill will be dynamically compacted from onshore before the surfac- ing and public utility services work begins. A 160 metre concrete noise barrier wall will also be built at the new harbour field, and the seaward part of this will be land- scaped with alder tree and sea-buckthorn seedlings. “This contract is important for Terramare and just right for our versatile equipment.

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TERRAMARE’S GRAB DREDGER KAHMARI 2 USES 8–11 m 3 dredging buckets. The environmental bucket is 16 m 3 .

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KAHMARI 2 WILL REMOVE 300,000 m 3 CLAY FROM THE SITE. The rock-filling area will be dredged to a depth of 27 metres.

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THE EXPANSION OF THE PETÄJÄS 4 HARBOUR WILL BE implemented through seaward rock-filling in the area marked blue in the image.

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TERRAMARE HR DIRECTOR PIRJO AKSELI VISITING THE SITE, guided by Dredger Master Vesa Luhtaniemi.

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