Kaisantunneli, a challenging project, is a masterpiece of infrastructure expertise

The contract’s design and implementation phases were extensive and involved foundation engineering, rock excavation, concrete construction and railway construction. The work was being carried out in a demanding urban environment in the immediate vicinity of the Helsinki central railway station. Our diverse expertise, experience and own equipment provided a good basis for carrying out this demanding project.

During the rock excavation phase, completed in early 2021, the construction site was surrounded by train traffic on three sides. Nevertheless, we managed to keep the disturbance caused to the passengers minimal. The pathways for passengers were closed only for a few minutes due to blasting work at a time.

During the project, we made changes to the tracks used in train traffic. During the works the railway tracks had to be reserved for the construction project well in advance and the agreed deadlines had to be met.

We carried out the concrete works of Kaisantunneli in 14 sections. The mould casting of large slabs required experience in work and logistics planning from our concrete builders. The varying types of soil and the hundreds of years old structures discovered underground made the construction of sheet pile walls difficult. The development phase of the contract, the joint meeting policy agreed during the contract and the utilisation of a data model were excellent examples of our seamless work planning and progress monitoring.

Every day, we ensured the operability of train traffic and the safety of about 200,000 people accessing the central railway station. We aimed to keep the traffic arrangements during the work the same for as long as possible to minimise the inconvenience caused to the passengers. Our up-to-date project communications supported the normal continuation of our various stakeholders’ activities.