Vantaa, the fourth most populated city in Finland, is home to Finland鈥檚 largest airport – the .
Since 2008, a has been under construction which will connect the airport and the adjacent business and retail district to the network. The new line will include five new stations, and travel through suburban communities, making it possible to take the train directly to Helsinki from the Airport.
The project has been met with some unforeseen problems, pushing the opening date back a year to July 2015. The ground and bedrock at the airport were found to be contaminated by long-term use of glycol used as an aircraft de-icing agent. Because of this contamination, the airport station needed to be re-designed and reinforced to withstand the harmful acidic products of decay by bacteria within the ground.
that more glycol leaks had been discovered at the tunnel construction site. Although these new leaks are smaller than the original leaks found in 2010, they are still troubling, and are adding additional costs and pressure to time constraints.
Leaks such as this can be devastating to a below grade project as well as to the surrounding environment. Using would prevent the contaminated water from penetrating the concrete tunnel, and This would greatly reduce the likelihood of any future leakage related repairs, throughout the life of the structure.
