External walls of the station are reinforced concrete diaphragm walls of 0.60m up to 1.00m thickness. To provide structure permeability and to discharge possible water leakages an outflow sewer of 30 cm width directed inside has been designed. The front part of the outlet sewer is separated from the rooms in the technical and passenger platforms zone. In the holding tracks zone the outflow sewer is exposed. Inside the diaphragm walls a waterproofing band has been placed. The outlet shall provide complete discharge of water leakages from the cubic volume. Ventilation and solutions providing access to control the channel space will be provided in the space between separating wall and the main diaphragm wall.
In the vicinity of south-eastern corner the existing underground walls of the WSS Społem building will be utilized as W3 exit stairs external walls.
Internal walls have been designed to comply with fire safety requirements. For detailed information concerning this issue, see chapter on fire safety of this document.
Materials used to construct internal walls have been chosen to comply with OSH regulations and acoustic requirements.
Masonry walls, non-structural, are treated as internal partition walls. Materials of the internal walls have been chosen in accordance with necessary requirements.
5.4.1Architectural concrete ceiling
The ceilings in check-in halls and underground passages have been designed as architectural concrete slabs.
In the platform space (level -3), the ceilings have been designed as precast plastered reinforced concrete slabs, covered with emulsion paint or as suspended ceilings. In the area of holding tracks the ceiling is made of structural concrete.
Suspended ceilings have been designed in train control rooms, station dispatch office, train dispatcher room, public toilets and staff sanitary accommodations, retail area – as modular 60 x60 cm with concealed main runners.
Materials for the suspended ceilings have been chosen to comply with fire safety requirements. For detailed information concerning this issue, see chapter on fire safety of this document. Materials for the suspended ceilings have been chosen to comply with OSH regulations.
5.4.3Suspended ceiling - platform
On the platform there is acoustic absorbing plaster applied on the ceiling reinforced slab under which, suspended ceiling type “A” is designed. (acoustic ).
That suspended ceiling has to be type of ceiling that will be cooperating with sound absorbing plaster on concrete slab, and will enable proper sound solution.
Underground structures have been designed as waterproof in order to provide continuity of insulation around the building.
Insulation system for the elements of the building having direct contact with the ground, as slabs, foundation or walls (apart from diaphragm walls) is composed of three layers: The first and the last layer is a geotextile (geomaterial) layer and PVC waterproof membrane placed between the geotextile layers.
Building waterproof quality condition is fulfilled through installation of the appropriate diaphragm walls solutions .
Diaphragm walls are put as separate segments placed side by side. Waterproof insulation is used between the segments. Additionally, in the vicinity of diaphragm walls a drainage channel has been designed with water pumping station in order to drain the water leaking through the wall in case the underground seal proved imperfect. Before the outflow sewer architectural panels or masonry walls will be fastened in order to separate the rooms inside the station from the zone where the possible water leakages may occur. As architectural finish elements panels made of architectural concrete may also be used.
Concrete and diaphragm walls reinforcements, that are in contact with the ground, are to be protected from the adverse influence of the ground waters. Reinforcement corrosion prevention and concrete body leakage prevention will be provided by use of chemically impregnated concrete.
Water blocking tapes will be used in expansion gaps and structure connections that are in contact with the ground.
Thermal insulations will be used on underground passages walls, in frost penetration areas, and on vertical enclosures (walls, ceilings, floors) separating spaces with significant difference in required calculated temperatures.
The walls and glass partitions in the underground passages are treated as external walls that, in the passage – a general-access zone, will be exposed to the flow of cool air from the outside.
For the external glass walls thermal insulation is required - heat transfer coefficient U max= 1.1 W/m2K.