Offsite construction of the Regency Road overpass
In February 2020, the R2P Project commenced preparation works for the offsite construction of the Regency Road overpass in the Polonia Reserve compound.
Preparation works include:
- site clearance;
- installation of underground utility services and drainage systems;
- installation of fencing for a secure worksite;
- construction of a car park for plant and work vehicles;
- construction of hardstand; and
- construction of levelling pads to support the overpass.
What is the hardstand?
The hardstand is a 300 millimetre thick area of compacted rubble that is designed as a platform with enough strength and durability to support the weight of heavy machinery. The material used for the hardstand will be re-purposed into the other areas of R2P Project once the overpass construction is complete.
What are the levelling pads?
The levelling pads are 75 millimetre thick base of compacted fine sand laid on top of the hardstand. The pads assist with the levelling and distribution of the weight of the temporary support structures, and to provide a firm base.
During early July 2020, the temporary support structures will be delivered to the site.
The purpose of the temporary support structures is to allow for 80 metre sections of the overpass to be constructed offsite in two pieces. This allows completed sections of the overpass to be installed via Self-Propelled Modular Transporters (SPMTs) over Regency Road.
There are 12 temporary support structures that weigh a total of 300 tonnes. These will support 2600 tonnes of the overpass, at 5.5 metres above the hardstand.
Approximately 210 tonnes of the steel being used for the temporary support structures is re-purposed from other South Australian infrastructure projects. After using them on the R2P Project, it is intended that the temporary support structures will again be re-purposed on future projects.
Steel supplies and the design of the temporary support structures has all been provided by South Australian based companies.
For more information on the Regency Road overpass please see the Fact Sheet.