Roads is working feverishly to create an overview of the bridges in Norway that may be in danger of collapse.
Monday afternoon collapsed Skjeggestad bridge when the soil under the bridge crumbled and drew one of the poles that held it up.
Several bridges may be in danger of meeting the same fate.
– We have much unstable due here in Norway, so it is nothing unusual that we build bridges on clay, says Borre Stenvold, brodirektør NPRA.
Jobs feverishly
Now jobs Roads feverishly to create an overview of the bridges in Norway that are built on or near mapped clay.
– There are over 17,000 bridges in Norway, said Stenvold. A large number are built on clay.
Even more avalanche prone
A few kilometers south of Holmestrand is Helland Bridge. It is constructed in the same manner as Skjeggestad bridge: partly mountain, partly steel core pillars drilled into mountain.
According to NVE mapping this area is even more susceptible to quick clay slides than Skjeggestad bridge was. This can brodirektør Stenvold confirm.
– Yes, here we are talking about two bridges that go over or closely related areas that are prone to quick clay slides.
– What will happen if areas under one of the bridges breeds like?
– No, it could indicate that a strain similar to that occurred during soil slide at Holmestrand, will receive additional bridges to crack together, says press officer Roads, Kjell Bjorn Vinje.
– Will have consequences
Currently, they do not know exactly what that made Skjeggestad bridge collapsed. Thus it is difficult to say what measures should be taken. But Vinje states that what happened is going to have consequences for the further management.
Veidirektøren has asked the regions to take an additional check on the bridges are constructed the same reason as Skjeggestad bridge.
– This did not happen, so we turn every stone to find out why it happened, so that we can prevent it from happening again.
Can race without notice
Inger-Lise Solberg is a researcher at the Geological Surveys. She researches much on clay landslide and has been involved in mapping such clay areas located around Helland Bridge.
– Quick camp is fixed until load is so great that it breeds out. When the liquid, almost like water. It is not certain that you get much notice. Perhaps one can observe some cracks as before, but it is not certain.
Solberg says that there are clay in the country, but that including large parts of eastern Norway are very vulnerable.
– It shall not stand on money
Transport Minister Ketil Solvik-Olsen (FRP) was on inspection by Skjeggestad bridge yesterday afternoon. He promised that stretch of road to be opened as quickly as possible and that it should not be for the money to bring order to the local traffic problems.
– If there is no damage to the northbound run on the bridge, it will be able to quickly be used as bypass, says Solvik-Olsen.
Several vehicles stood yesterday evening still on the bridge, and construction manager Odd Tandberg Road Administration informs NTB that it is not yet clear when they can be retrieved.
Road Administration has experts on hand to investigate the circumstances, and until they have had their say, it happens little.
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