The construction of a new bridge in Jätkäsaari will commence around the beginning of October, and trams and other traffic are scheduled to travel on the bridge as soon as the spring of 2021. The bridge construction site will have no effect on the Jätkäsaari traffic, but the related pile-driving may cause noise.
The main work phase will consist of the construction of a pile base between the eastern end of the bridge (at the pier of Valtamerilaituri) and West Harbour Terminal 2. This will be the base of the bridge and local street structures. Piles will be driven on weekdays from 7 in the morning to 22 at night.
As soon as the bridge is completed, tram line 8 will again be running to and turning around at Saukonpaasi, and tram lines 7 and 9 will be running on a “Jätkäsaari loop”, because line 7 cannot turn around owing to the West Terminal construction work.
Temporary traffic arrangements will be in place until 2022 at the Bunkkeri turn-around site. The Tahitinkatu turn-around site will be completed in the following year, that is, in 2023. Once the Tahitinkatu site is completed in 2023, the local tram line network is complete, and line 7 will run to Tahitinkatu and lines 8 and 9 to Bunkkeri.
The construction of the Atlantinsilta bridge and new tram lines will be paralleled by the construction of waterfront support walls and surrounding street areas. Other municipal infrastructure and lighting will also be constructed.
The breakthrough of LED lighting meant that the Jätkäsaari lighting plan, drafted since 2005, had to be redone.
Streets, parks and playgrounds have their own lighting requirements. The Jätkäsaari outdoor lighting can be recognized from half-globe shaped hanging lights and graphite-grey pylon street furniture. The pylon model was designed specifically for Jätkäsaari. Double cables are needed in the maritime district of Jätkäsaari, in order to prevent lights from swinging in high winds.
Hanging lights are favoured in densely built city districts such as Jätkäsaari. The supporting cables of lights are fixed on building walls in the narrow streets of Jätkäsaari. On main streets, cables are fixed on pylons shared with tram lines. The final outdoor lighting can usually be built only when streets and the buildings lining the streets are complete.
The most common colour temperature of lights is 3,000 kelvins, which has the appearance of warm white.
Today all new outdoor lights in Helsinki are LED lights. Helsinki has a total of 87,000 outdoor lights. The LED technology saves a great deal of energy compared to conventional lights, which is important for the city’s goal to be carbon neutral by 2035. Lighting maintenance needs are also reduced. Conventional lights have to be replaced once in every 3–4 years, but the service life of LED lights is estimated to be 25 years. Furthermore, the efficiency of LED lighting can be adjusted freely. For example, nighttime lighting levels – and electricity consumption at the same time – could be dropped to one-fifth of normal lighting levels.
“It’s well worth coming to admire the lighting of the Jätkäsaari bridges – Rokkiporkkana and Crusell Bridge – from longer distances,” recommend contracting manager Teemu Rinne and lighting designer Taneli Lehtonen.