Boskalis Nordic Today No. 01/2019
CITY OF HELSINKI | KRUUNUVUORENRANTA – KOIRASAARET AND STANSVIKINRANTA PRECONSTRUCTION CONTRACT
ing. Dust accumulation on the transport routes used in the filling work is also pre- vented, if necessary, by water sprinkling,” says Pöyhönen.
out by Terramare’s floating work pontoon Bolle VIII, which will be towed and assisted by the multipurpose vessel Eija. “This half kilometre long swimming beach will be filled with pure natural sand. In ad- dition to the beach area filling, we will cre- ate a sandy sea bottom, extending around 20 metres seaward from the shore. The outermost edge of the sandy bottom will be at a depth of around two metres. Before sand filling, an underwater erosion slab, protecting the site, will be constructed at the seaward edge,” says Pöyhönen. ATTENTION PAID TO ROCKS, ISLETS AND TREES AT THE SITE Care and attention will be paid to the natural
THE SEA-FILLING IS CARRIED OUT USING high-performance trucks, of which the most powerful is the Caterpillar 777 series. This truck weighs 160 tonnes when fully loaded. THE BLASTED ROCK USED IN SEA-FILLING is obtained mainly from the Helsinki blasted rock storage facility, situated only 200 metres away from the site. The facility has around one million cubic metres of rock waste. rocks, islets, shoals and trees of the area. “Engraved names dating back to the 19th century can be found in the rocks of the shore, and some of the pines in the shore area may be up to 400 years old. It is part of our agreement that rocks, is- lets and shoals are delimited outside the contract area, and that they are protected from any kind of damage,” adds Pöyhönen in conclusion. The preconstruction contract will be com- pleted in 2020. The residential area to be built in the sea-filling area will be complet- ed by 2030.
NEW STANSVIKINRANTA SWIMMING BEACH
Work on the preconstruction contract’s Stansvikinranta swimming beach will be implemented from the sea. Reed clearance and dredging at the location will result in the creation of the beach area, implement- ed with a sea-facing erosion embankment and sand filling. A total of 70,000 cubic metres of sand, transported by sea from Porvoo, will be used in filling the swimming beach. Sand transportation will be carried
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