The dispatch centre for M3 metro line traffic has been upgraded

"On the fourth floor, the formerly separate rooms for dispatchers, operators and dispatchers have been converted into a large single-room control centre and an adjoining kitchenette, for which we have dismantled the existing suspended floors, ceilings, furniture, the entire ventilation and heating system, electrical wiring and lighting installations. During the demolition and reconstruction works, it was necessary to ensure continuity of operation, while temporarily relocating the information systems (including the fire alarm control panel monitoring the entire line) and protecting the control of the security system, which was installed on the central panoramic wall. The premises were fitted with new tiled suspended floors, coffered plasterboard ceilings and painting. The heating, ventilation, electrical and lighting systems were upgraded and a new fire alarm system was installed. In the tea kitchen, we have installed new kitchen furniture with modern appliances." - said László Varju.

The basement has been converted into a ventilation machine house

On the fourth floor a telecommunications equipment room was partitioned off from the ventilation plant room area. Due to the higher cooling demand, the room is cooled by air conditioning units. On the second floor, a battery room has been converted. A new training room was added on the first floor. The metal flooring has been replaced and the electrical installations and lighting have been completely renewed. The room is heated by radiators.

The basement houses a 10kV protected switchgear room, a service transformer (SÜTR) chamber and a ventilation plant room. In the switchgear room, the entire false floor system was demolished and new cable ducts were added to the existing recessed floor zones by removing the existing 60 cm thick backfill concrete strips.

The room has been fitted with a new heavy-duty suspended floor system and fire doors. The auxiliary transformer chamber was separated from the protected switchgear compartment by masonry. The mechanical and electrical installations were also completely renewed. The auxiliary transformer is cooled by 2 high-capacity air-conditioning units installed in the ventilation room with liquid chillers on the roof.

The experts had to overcome a number of difficulties in the course of their work

"In the dispatchers' room, we also replaced the false floor, the false ceiling, the entire mechanical system (air conditioning, heating), the electrical wiring and the lighting equipment.In the KUD/MÜDI area, the media wall was completed, on which the 22 monitors monitored by the dispatchers were installed. New ergonomically designed desks and work chairs ensure better working conditions, as does the refurbished kitchenette,"said the specialist.

He then pointed out: "In a functioning office building, working with modernisation is always a challenge. We faced different difficulties from floor to floor.On Floor V, the construction work was made more difficult by the fact that we had to complete the work in a fixed timeframe, during the eight-week summer cut-off period of 2022. A particular difficulty was that in a part of the premises of about 100 square metres, the safety monitoring and control system located on the panoramic wall, which is essential for the central traffic management work in the metro, had to be temporarily protected and its continuous operation had to be ensured twice during the 0-24 hours. In addition, there are a number of other key organisations operating in this building, whose uninterrupted operation had to be ensured at all times."

The main challenge in building the classroom was the new partition wall. A special solution was needed to launch the partition from the slab due to the large amount of non-transferable cables and cable trays running under the false floor and crossing the partition line, as well as for the top connection of the partition, where the wall could be connected to the main support instead of the slab.

The support of the partition wall to the slab was finally solved with a steel supported bridge, adapted to the circumstances, on top of which an auxiliary structure had to be installed to fix the steel to the main support.

At the basement, the existing PV wall had to be temporarily demolished to allow the removal of the demolished transformers and equipment and the delivery of the new transformers and equipment.

Modernising low-voltage systems was a complex task

Rudolf Kerecsenyi said:

we have set up a fire alarm control centre and a refurbished security control centre. The KFM, KUD and MÜDI workstations are located in a common room. The functional extension of the former had already been completed, such as the replacement of the timetable recorder, the train number display and the handling recording equipment, and a new timetable editing software for the production of daily timetables had to be delivered."