Teletorn, Eesti
Eesti kõrgeim ehitis ja oluline vaatamisväärsus kasutab Uponori maa-alust ventilatsioonisüsteemi.
Over 40 years is not yet a bad age for plastic pipes – however, not even the best pipe can withstand mechanical stress forever. In Kajaani, a pressurised sewer that has broken down due to faulty installation will be renewed by relining. This reliable and fast method will also be cheaper than excavating for the site.
The pressurised sewer in the Purola and Katiska residential areas in Kajaani got off to a boisterous start in the new year. The pipe burst and some of its content leaked into the surrounding ground. According to Kajaani Waterworks' network manager Markku Piirainen, this was the proverbial last drop. – It was already the fourth time in the last few years that the same pipe had caused problems. Kajaani Waterworks decided to renovate the whole line, for a total pipe length of over a kilometre. – The line was built in 1973, which means that the plastic pipes are not that old yet. However, the use of plastic pipes had just begun to become more common and there was still a lot to learn about their installation. The old pipe was installed based on the know-how of that time. The burst pipe in the Purola and Katiska areas rested directly on top of rocks and bedrock. The proper way is to use an installation base under the pipe and fine soil around it. The base and the surrounding area must also be carefully compacted. – The problems were caused by the fact that the pipe installed on top of bedrock and rocks did not withstand external mechanical stress, says Piirainen.
The old plastic pipe will now be renovated by relining. A 500-millimetre, 10-bar pipe will be installed inside the 630-millimetre, 6-bar pipe. – Therefore, the old pipe will remain as a protective shell for the old pipe. Capacity will slightly decrease due to the smaller pipe size. However, we have calculated that the system will take it well, says Piirainen. Uponor Infra will be responsible for the site's comprehensive contracting. Fitter Mikko Kallioinen from Uponor Infra says that the pipe will be relined 300 metres at a time. – Excavations will be made at both ends of the line, and the new pipe will be winched inside the old one by a lorry. The winch has a pulling force of 15 tonnes. Kallioinen fully agrees with Piirainen on what caused the problems. – There are hundreds of rocks in the ground.
A total of 4,000 cubic metres of wastewater, accounting for 60 per cent of Kajaani's wastewater, flow daily through the pressurised sewer to be renovated. – All wastewater installations must obviously continue to function also during the renovation. Bypass pumping has been arranged for the duration of the work through a small pipe laid on the ground, says Piirainen. However, while connecting the new pipe, the line will have to be cut off for a total of three times. Pumping will also be temporarily interrupted. During outages, wastewater will be collected by suction vehicles and transported to the treatment plants. – All cut-off and connection work will be carried out at night from midnight onwards, when the amount of incoming wastewater is at its lowest. At seven in the morning, the flow is strong again, states Kallioinen. A smaller 250-millimitre branch from another pumping station has been connected to the main sewer line. The connection will now be closed permanently, and the line will be routed directly to its destination well. The about 400 metres to the well will be bored directionally through two excavations. – The ground is moraine and sand. Therefore, directional boring works well, says Kallioinen.
Eesti kõrgeim ehitis ja oluline vaatamisväärsus kasutab Uponori maa-alust ventilatsioonisüsteemi.
Butt welding by night of 900 mm pipes ensures stable operation of a district cooling solution in Copenhagen Harbour.
City of Lahti is building new neighborhood called Ranta-Kartano. While they were constructing basic infrastucture the city saw the possibilty to reserve some ground space for storm water management. Now there is a test running for different kind of storm water management. Uponor is involved with new type of storm water filter.
To rebuild an office building located in the heart of Amsterdam into 150 appartments in a relatively short time is definitely a big challenge.
Rapid action was critical when a sewage collector broke in Warsaw, Poland, causing a massive waste spill into the Vistula River. Uponor Infra’s crew worked 24 hours a day in order to stop the pollution of the river. A temporary pipeline was produced, delivered and connected in just eight days.
September 2018 saw the launch of the project for a stormwater drainage system in Rzeszów, almost 26 kilometres long, in the residential District of Budziwój, which partially coincides with the floodplain of the River Wisłok. One of the elements of this system is the retention canal. The project, scheduled for delivery by May 2020, will help to finally solve flooding problems which have been plaguing the residents of this region of Poland.
Thanks to swagelining technology, it was possible to carry out most of the water line modernisation works in the centre of the city of Łódź, in a built-up area, along traffic lanes with heavy traffic of motor vehicles and trams.
Construction of storm water collectors in Nowe Polkowice is one of the stages of a big investment concerning the drainage of the district.
A sea outlet of treated wastewater was initiated in Swarzewo. It is yet another of the many environmentally friendly projects that have recently been carried out in Poland where PE pipes were used.