They have their signature in the Marmaray project: Rota Teknik A.Ş. "Marmaray Tunnel Ventilation Electropneumatic Control System", which was developed jointly by Japan TAISEI and ANEL, was successfully commissioned.
The construction sector, which has gained momentum in recent years, also accelerates the development of high-speed trains and subway lines as well as modern workplaces and residences, as well as new and extended roads. In the field of transport, especially rail system investments have increased, Marmaray stands out as the largest of these projects.
The project is located on the European side Halkalı is based on the improvement of the suburban railway system in Istanbul, which will connect the Gebze districts on the Asian side with a continuous, modern and high capacity suburban railway system. Railway lines on both sides of the Bosphorus are connected by a railway tunnel connecting the Bosphorus.
The Marmaray project, one of the largest transportation infrastructure projects in the world, has improved and the whole new railway system is approximately 76 km long. Main structures and systems, immersed tube tunnel, drilling tunnels, open-close tunnels, level structures, three new underground stations, 37 aboveground station (renovation and improvement), operating control center, pitches, workshops, maintenance facilities, built on the ground The development of existing lines, including a new third line to be covered, includes all new electrical and mechanical systems and modern rail vehicles to be supplied.
One of the most critical elements of the Marmaray Project is; Bosch Rexroth main dealer Rota Teknik A.Ş. and ın Ventilation and Smoke Control System. developed jointly by TAISEI and ANEL companies.
PURPOSE OF SYSTEM INSTALLATION:
Providing comfort for passengers and staff,
Prevention of condensation in equipment,
Removal of the temperature created by the trains,
Management of the pressure created by trains (piston effect) and
Control and removal of smoke during fire.
The train can simply be compared to a syringe and a plunger inside the tunnel. The train compresses the air in front of the tunnel and creates a vacuum at the rear. The electropneumatic control system developed under normal conditions enables the removal of the hot air generated by the piston effect created during the voyage of the trains, controlling the opening of the ventilation shafts damper covers to draw the fresh and clean air into the tunnel and eliminating the vacuum effect behind the train. In case of stopping the trains in the program, the tunnel ventilation fans are operated in such a way as to ensure the ventilation of the train formed by the piston. To achieve this, some of the fans around the station are programmed to operate in fresh air blowing mode, and some in exhaust fire mode. In case of dangerous situations such as fire, derailment and scattering of flammable materials in the tunnels and stations, the whole ventilation system removes harmful gases and fumes by supplying fresh air to the area where the emergency situation occurs. In this way, the temperature is controlled for safe evacuation of the people and the fire brigade intervention.
In the project, the removal of hot air from the tunnel, instead of supplying fresh and clean air is provided by the station and ventilation buildings connected to the tunnel.
SYSTEM ELEMENTS
Marmaray pneumatic damper control system; compressor rooms, air preparation units, electro-pneumatic control panels and damper actuators.
In this project there are three stations connected to the tunnel and three ventilation buildings and each station / ventilation unit has at least two compressors, two filtering and air drying lines and two air tanks.
The number of electropneumatic control panels produced by Rota Teknik is 44 pieces, including pneumatic and electric. Electropneumatic valves, which are used in these panels and which control the damper actuator close to 150, with thousands of fittings and hundreds of meters of hose, heavy series filters, regulators and lubricants used in the pre-assembled conditioner units, continue to work safely with the preferred Rexroth quality in material selection.
The pressurized air is conveyed to the conditioner groups in the region where it will be used by means of copper pipelines and the desired control is provided via the PLC (manually in case of emergency) via the electropneumatic panel.
All Rexroth brand pneumatic valves in the system are in accordance with ISO 5599-1 standard by Rota Teknik. All the materials used were assembled in the system in such a way that they were selected or provided to reduce maintenance / breakdown times as well as their functionality.
OPERATING PRINCIPLE OF THE SYSTEM
The damper assemblies in the station and ventilation buildings can operate in a fully open or fully closed position by means of pneumatic actuators which enable the movement of the slices with a blind principle. The operation of the system provides all combinations of the operating conditions mentioned above through the electropneumatic control panels via the central automatic control system.
The dimensions of all Rexroth valves used in the system and the copper pipe diameter calculations were recalculated in a way that minimized the opening times of the dampers and minimized the pressure drop (taking into account the site conditions). The settlement problems, such as the distance between the compressor unit and the damper groups, and the fact that the same group of dampers are in different locations, have been finalized by reconsidering the site conditions. The entire system was successfully put into operation by working with the required speed and minimum pressure drops as a result of approximately three months of engineering and design, commissioning work and tests.
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