We participated in both phases of the West Metro (1 and 2) as an expert in HVAC, building automation and electrical design and fire prevention.
In the first phase, we were responsible for the HVAC design of the eight first metro stations along the 14-kilometre route from Ruoholahti to Matinkylä. After the first phase, we also took part in backing up the commissioning.
In the second phase, we prepared HVAC, electrical and automation plans for five stations from Matinkylä to Kivenlahti, for the underground depot in Sammalvuori and for the tunnels. The West Metro contains a total of 21 kilometres of tunnels.
Personal safety is the primary goal of technical building services
The metro line that is being constructed during the largest infrastructure project in Finland will serve over 170,000 passengers daily. Technical building services ensure good indoor conditions, energy efficiency and safety even under exceptional circumstances, for example, in the case of fire.
“From the perspective of electrical systems, the West Metro is a challenging project with multiple electrical and security systems and extremely strict personal safety requirements,” says Matti Urjo, Head of Electricity Department at Granlund.
The HVAC and electrical engineers used exceptionally long ventilation ducts, frequency converter-controlled smoke exhaustion and replacement air systems and pressurisation fans in the West Metro. Energy efficiency was ensured through heat recovery and appropriate ventilation.
“In addition to ventilation, heating and cooling, the important elements are smoke exhaustion, pressure and exhaustion systems and fire response and drying systems,” Project Manager Anssi Leppäaho points out.
“The West Metro features the most advanced technology and safety features in the world.”
– Matti Kokkinen, CEO of Länsimetro Oy.
BIM model for the maintenance of the West Metro
Throughout the project, the engineers were prepared for changes because the contract cost calculations would only be completed after the building services engineering. Furthermore, overground land use planning was in progress during the construction.
The designers used 3D modelling since the beginning. A BIM model that can later be used in the maintenance of the West Metro was also prepared during the project.