Digital Train Radio System Kingsgrove BTS Site Review of ...

3.1.4 Fibre optics
The proposal is to install a new RailCorp Network Access Point (NAP) in the existing pit at
TE12+541 and run two new 12 core single mode optical fibres (SMOF) to this location. The two
new 12 core SMOF will run in a new trench for approximately 50 metres towards to existing pit
at TE12+485. The pair of fibres will continue the existing pit pipe route towards existing pit at
TE12+541 where a new joint is also installed. At the new NAP, it will be spliced with the
RailCorp bearer network. Approximately 2 x 110 metres of 12 cores SMOF will be required.
3.1.5 Earthing
The earthing installation will comprise six earth stakes at a pre-determined distance apart. The
grid will be nominally 4.0 metres x 2.0 metres, placing the six earth stakes two metres apart.
Once these earth stakes have been installed, the system will be tested and modified if needed.
The initial extent of the trenching for earthing grid will be around 20 metres. However, it can be
extended up to five metres if the results show that the earthing arrangement is insufficient.
3.2 Construction Methodology
Construction of the BTS facility will require the use of approximately 60 square metres of land.
This area will allow for the erection of the monopole and the slab containing the BTS and power
cabinets.
The area of ground disturbance at the BTS site is likely to be in the vicinity of five square
metres. The monopole foundation will require an excavation approximately five metres deep
with a diameter of one metre. This will result in approximately five cubic metres of excavated
material which may include rock.
Installation of the power and fibre optic cables will require excavation of trenches approximately
1000 millimetres maximum depth and 500 millimetres wide.
The indicative construction methodology of the facility will include elements outlined below.
Non-destructive excavation before construction to establish underground installations.
Site establishment.
Excavation of the foundation for the monopole using excavator, drills or auger.
Delivery and pouring of concrete on site for the monopole foundation.
Installation of concrete slab brought to site for BTS and power cabinets.
Excavation of trenches for power and fibre optic cables.
Installation of conduit within trenches, followed by installation of cables within conduits.
Backfilling of trenches.
Transport and installation of monopole sections using trucks and riggers.
Page 24 of 78