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Section 03

Temporary Works

Planning, installation, operation and decommissioning of temporary works | power consumed on site | const-ruction lighting | site communications | positioning | works ventilation | monitoring of all temporary works in logistics and security control | integration of temporary tunnel drainage systems
ARGE ALPTRANSIT BRENNER is responsible for the planning, installation, operation and removal of all the site temporary works in the main tunnel, rescue tunnels, crossways, shafts and buildings.

 

Site lighting

Approximately 3,200 fluorescent lamps will be installed, every second one connected to a rechargeable bat-tery capable of providing light for at least 3 hours. The lighting can be turned on and off section by section from the central control room.

Site electrical power supply 

5 feed points with emergency power generators, 40 transformers 10/0,4kV for the distribution of power over the site, 220 supply distributors for connecting to mobile supply posts or other consumers (fans, pumps, concrete vibrators, work lights) and 220 power outlets for the communications and distribution cabinets) are needed to install the site electrical power supply. At any given time up to approximately 40 km HV, LV and optical fibre cables are installed.

Site communications

All information is channelled to the control centre. The communication centre is also located here. There are two separate telephone systems to provide as high a level of redundancy as possible. One is only for the emergency telephones installed in the tunnel (approx. 230) and the other controls internal and external communications over the IP fixed line telephone network or WLAN wireless devices (about 300 WLAN wire-less telephones will be in final use). The emergency telephones automatically connect to the control centre immediately on being picked up and transmit the current position of the caller.
All information (including data transfer) runs through a network (fibre-optic cable ring), which is designed with inbuilt redundancy.

Access and positioning system 

The whole site area including the tunnel system is fitted with an access and positioning system. A control system is installed at every vehicular (11 No.) and pedestrian access point (43 No.). The entry points have a cabinet system, which opens only if the correct authorisation is presented, in this case captured from active badges (tags) on vehicles and their occupants. There are a total of 24 video cameras at the entries. They provide additional control by transmitting the actual situation on site to the monitors in the control centre.

Positioning in the tunnel works by means of the badges - which every employee and vehicle must carry – and the readers (93 No.), which are installed in the communications and distribution cabinets). The positio-ning system software in the control centre shows this information graphically and eases the task of identify-ing a person's actual position on site.

This system allows rapid and precise coordination of the emergency services (fire brigade, rescue teams).

Tunnel alarm system

This system is required for speedy evacuation of the tunnel system in an emergency. Every communications and distribution cabinet (220 No.) has an orange and a red revolving light as well as a signal horn. When an alarm is triggered by the control room, the priority of the alarm either indicates a warning (contact the control room for details) or instructs the personnel to evacuate immediately.

Site ventilation and air quality measurement 

Every section of the installation work has two stationary air quality measuring stations. The various measu-red values (air quality and speed ) are captured and displayed in the control room. If the limiting values are exceeded, an alarm sounds and the necessary measures initiated, which may extend up to evacuation of the tunnel. A flexible ventilation concept was chosen for the project. A jet fan can be connected to every com-munications and distribution cabinet (installed every 250 m along the tunnel) to receive power and communi-cations signals. The jet fans can then be controlled individually from the control room.

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