Renovation of town hall, sanitary, heating, ventilation installation

Wastewater and water systems (Lot 1 Sanitary), Heat supply systems (Lot 2 Heating), Ventilation systems (Lot 3 Ventilation), Smoke extraction for the underground car park (Lot 4 Smoke extraction), Fire extinguishing systems (Lot 5 Fire extinguishing system)

As part of the comprehensive renovation of the St. Georgen town hall, the entire sanitary building equipment will be completely renewed and adapted to the current technical and hygienic requirements. The existing main connection for drinking water supply will be dismantled by the responsible water supplier Aquavilla and reinstalled in the building. After the first main shut-off valve, the complete reconstruction of the drinking water network within the building will take place. The drinking water installation will be completely newly created and will be executed primarily in a high-quality stainless steel pipe system. To ensure high drinking water hygiene and to minimize stagnation risks, the piping will largely be designed as a flushed system up to the respective withdrawal points. This ensures continuous flow and supports compliance with hygiene requirements. Hot water supply for the washbasins will be provided decentrally via electric instantaneous water heaters. This concept eliminates the need for central hot water generation and circulation systems, offering both energy and hygiene advantages. At the same time, installation costs are reduced and operational management is simplified. Modern, touchless faucets will be used at the washbasins in the toilet facilities. In addition to user comfort, these faucets are particularly important for hygiene. Furthermore, the faucets are equipped with integrated hygiene flushing functions that enable automatic, regular flushing of the pipes. This sustainably ensures water quality and reduces the risk of microbiological contamination. The wastewater installation within the building will be completely renewed and executed in durable PE pipe systems, some with integrated sound insulation. Existing sewage pipes will be renovated using the liner method where technically and economically feasible. This method allows for the refurbishment of existing pipes without extensive earthworks and contributes to preserving the building fabric. Due to the existing backwater level in the sewage disposal area, a hybrid lifting station will also be installed outside the building. This station is used to safely convey sewage from the building in the event of backwater and to prevent it from flowing back into the building installation. This ensures reliable protection of the sanitary facilities and the affected building areas. In the toilet cores, the installations will be carried out in a pre-wall construction. Modern stud frame systems will be used, allowing for flexible arrangement of sanitary facilities and creating a clear separation between the structural shell and the installation level. This construction method facilitates both assembly and later maintenance and repair work. Overall, the measure includes the complete renewal of all sanitary installations in the building, the reconstruction of the drinking water network from the main shut-off valve, the partial renovation of existing sewage pipes, and the implementation of a hygienically optimized supply concept. The aim of the measure is a durable, economical sanitary installation that complies with current standards and offers high operational reliability and user-friendliness. As part of the renovation of the St. Georgen town hall, the building's heating and cooling supply will be completely rethought and implemented as a sustainable, energy-efficient system. The supply will be provided by a central heat pump system in conjunction with geothermal deep drilling, enabling year-round use of environmental energy. Several ground probes, accessed via deep drilling, serve as the heat source and utilize a constant temperature level in the ground. The heat pump operates with a natural refrigerant (CO₂ / R744), making it a particularly environmentally friendly and future-proof solution. In addition to providing heating, the system will also be used for cooling the building, ensuring economical year-round operation. Central energy generation is located in the building's underground car park. From there, the generated heat and cooling energy will be distributed via a utility duct running under the underground car park to a central distribution room in the basement (U-1). This distribution room will handle the further distribution to the individual building areas and the connection of the various supply systems. The building has two technical control centers, which operate and regulate the respective system components. The systems are designed to ensure demand-oriented and energy-optimized supply to all usage areas. Heat and cooling transfer within the building will be carried out via various systems tailored to the respective usage requirements. These include classic radiators, surface heating systems in the form of underfloor heating, and air handling units. Additionally, ceiling radiant panels and induction units will be used, suitable for both heating and cooling operation, ensuring high thermal comfort. The pipe network for distributing heating and cooling energy is predominantly a two-pipe system. In selected areas, a four-pipe system will be used to enable simultaneous heating and cooling. In the two-pipe systems, the switch between heating and cooling operation is centrally managed in the distribution area. This ensures economical and efficient operation...