Penrith Lakes Bridge Project.

The contract called the widening of an existing single lane bridge to two lanes.

The original bridge was constructed during the quarry development stage; the abutments for stage two were also constructed in this stage, but not the centre pier.

When the second stage commenced the quarry had been transformed into a lake and was approximately four metres deep at the bridge site.

The contract design was based a on a sheet piled coffer to enable construction of the pier, however, due to the nature of the lake bed was impracticable.

An alternative using a prefabricated caisson was used; this was lowered into place using a large crane and positioned by a team of divers.

A mass concrete plug was poured underwater by the tremie system and then the caisson dewatered and the pier constructed, the upper portion of the caisson removed.

Precast arch units,each weighing 19tonnes were then placed to form the arches, due to access difficulties two 200tonne capacity cranes were required for this operation.

Again divers had to be employed as the base of the units was below water level.

The retaining walls were reinforced panels, backfillng below water level was stabilised and select fill for the remainder to subgrade level.

The pavement was a reinforced slab, tied to existing pavement.

Sydney Airport Projects

NACE has vast experience in airport construction, both air and land side. We are very conversant with protocols and procedures of both civil and military airfields: Concrete aprons, rigid and flexible taxiway pavements, main runway tie-ins, line marking, airfield communications and power supply ducting, stormwater drainage, pollution, and flame trap structures, blast fences and walls, aerobridge foundations, airside roads, ground access projects, car parks, kerbside re-construction, landscaping and ground remediation.

Hyde Park Upgrade Project: Stage 1

Client:City of Sydney

Stage 1 of Hyde Park Upgrade was bounded by College, Liverpool, Elizabeth and Park Streets.

Major features of the project included:

• A new stormwater system which included a major outfall under Elizabeth Street.
• Complete reconstruction of the Pool of Reflection in front of the Anzac War Memorial and new exfoliated granite paving to the Memorial surrounds.
• The reconstruction of all roads and footpaths within the stage. All the the kerbs, gutters, lintels and the pavers in the central avenue were precast in our factory using Tarana pink aggregate. Except for the central avenue all the pavements were surfaced with pink asphalt.
• A new retaining wall along the College Street boundary. This was constructed in reinforced concrete with a sandstone facing. The colour, texture and construction of the sandstone complying with strict heritage guidelines.
• New street lighting, the lighting columns and based designed in accordance with heritage guidelines.
• Ancillary works included selective tree removal, relocation of services and refurbishment of various monuments.
• The park is a major pedestrian thoroughfare and access was maintained for the duration of the project.