Tungatinah Dam Intake Gate
Tungatinah Power Station is located in Central Tasmaniaand is a run of the river hydro power station. It is the fourth largest power station in Tasmania and draws its flow from a system of highland lakes. Water is drawn through an 800 metre long tunnel before it divides into five penstocks which run eleven kilometres to the station turbines.
Before the entrance of the tunnel is an Intake Gate. The Intake Gate acts as an emergency protection device in the event of a failure in the tunnel of the penstocks. The exiting Intake Gate which was installed in the 1950s had a history of poor performance and therefore needed to be replaced. The type of gate chosen to replace the existing gate was a radical gate.
In order to replace the gate, various components of civil works were required which included:
- Site management (24 hours, seven days)
- Drilling and blasting in a sensitive environment (within three metres of existing Hydro infrastructure)
- Critical tolerance concrete
- Drilling, anchoring and grouting
Scope of Works
- Upgrade of existing roads from access to tunnel portal (approximately 500m)
- Construction of new road to proposed 60 tonne crane pad and also construction of the crane pad
- Excavation and construction of valve and actuator footings, including slab and plinths
- Construction of bearing pedestal foundations including excavation, scaffolding, drilling and staged concreting
- Support and bracing of associated supplied metal work
- Supply and construction of portal building top and bottom
- Erection of security fencing
- Construction of gate sill foundations including excavation, scaffolding, drilling and staged concreting
- Abutment construction
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