Hammondville Elevated and Surface Reservoir Roof Renewal & Relining
Sydney Water
Location:
Sydney NSW
AustraliaConsultant:
SASTTI JV
Date:
Mar 2016 to Oct 2016
Hammondville Elevated and Surface Reservoir Roof Renewal & Relining
Description:
The project comprised the refurbishment and equipment upgrade of two reservoirs. The tanks were constructed in 1972 and are part of the Prospect South Water System owned and operated by Sydney Water.
The surface reservoir is a circular steel reservoir with a diameter of 30.5m, a wall height of 12.3m and a storage capacity of approximately 9ML. Due to high level of corrosion and damage on the roof structure, Freyssinet Australia was engaged to perform refurbishment works to the roof structure and a full relining of the reservoir.
The elevated reservoir is a circular steel reservoir with a diameter of 9.8m, a wall height of 3.8m and a storage capacity of approximately 0.23ML. The tank is supported by a 16.4m high steel braced tower consisting of a central column and eight perimeter columns. The roof structure failed all testing performed and needed to be entirely replaced along with an important refurbishment of the external supporting structure.
Key Aspects:
Removal and reinstatement of the telemetry, mixers and mixer mast.
Installation of a new access hatch in the wall of the reservoir.
Demolition of the central trig station, water level indicator, handrails, davit, external staircase, and internal ladder.
Removal of existing roof sheeting, hatches and vents.
Removal of steel perimeter walkway and walkway supports.
Installation of a horizontal plate to the top of the existing stiffening ring for the full perimeter of the reservoir.
Installation of new stiffener under the exterior of the stiffening ring at new handrail posts.
Installation of supports for the new bridge leading to the stair tower adjacent to the elevated reservoir.
Removal and disposal of roof support structure including rafter, cross beams and purlins.
Abrasive blasting and epoxy coating of reservoir interior walls and columns.
Concrete encasement of the base of the intermediate columns.
Installation of new galvanised steel rafters, cross beams and cross bracing, and new cold rolled aluminium purlins.
Installation of new checker plated work areas and associated hatches on each side of the reservoir.
Installation of modular galvanised steel handrails, aluminium roof sheets and walkways, stainless-steel roof ventilators, new internal equipment (such as ladders and platforms…), and a “rooftop pillar” as a permanent survey mark.
Reinstatement of an alarm system.
Replacement of heavily corroded covers for pressure and sampling ports with stainless steel covers.
The salvage, re-installation and commissioning of all existing electrical/IICATS (Telemetry) system, control sensors and wiring
Erection of appropriate signage.
Removal of existing screen and installation of new floor mounted HDPE screen on the outlet.
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