steel@mdsp.com.au
www.mdsp.com.au

Our roll former has been designed and manufactured by a development team of engineering experts and is established as the only roll former capable of producing cold rolled formed sheet piling in the world. It is this cold rolled process that enhances the overall strength properties of the final product to achieve the only university tested and certified property sheet pile product available to the light weight piling world market.



The MacDonald developments in testing and specifications for our products have been carried out in conjunction with the following groups: the Queensland University of Technology in conjunction with BHP, Thomas Taylor Whiting (Structural Engineers NSW), Weathered Howe and Robert Bird & Partners (Structural Engineers Qld).

We note the properties of the patented MacDonald Sheet Piling (150mm profile) piling sections upon completion of the cold rolling process are as follows

• Tensile testing of steel specimens cut from sheet piling gave the following average tensile strength properties;
Yield stress fy = 409 MPa*
Ultimate tensile stress fu = 501 MPa
- based on 0.2% proof stress

• Tensile test results showed that the steel used in the sheet piles had tensile stress- strain curves with a substantial yield plateau, an average percentage elongation at failure of 29.1%, and fu / fy ratio of = 1.22. These results indicate that the steel used has adequate ductility

Tests were carried out by Associate Professor M. Mahendran - Physical Infrastructure Centre, School of Civil Engineering, Queensland University of Technology - QUT Test Report No. CET 5189 - 10 August 1999 completed


Comments contained in an investigative report by Richard Heggie Associates Pty Ltd (5 November 1998), while our system was being used to install sheet piling in close proximity to "sensitive structures"
Test and investigations conducted by Richard Heggie Associates Pty Ltd on the MacDonald sheet piling and anchoring system in close proximity to "sensitive structures", indicated the vibration levels to be considerably conservative relative to the acceptable building criterion. This is achieved through the rubber mounted Vibro-head that operates at around the value of 2700 Hz compared to the desirable level of 10 Hz.

For further information on details on these tests refer to the Internet Site for this document prepared by Richard Heggie and Associates.
   
Briefly as stated in the Report on a heritage listed site in Sydney by Richard Heggie Associates the following conclusion was reached:

"...vibratory pile driving trials caused vibration levels of up to 2 mm/s which is below the building damage criterion of 5 mm/s, applicable to typical residential and commercial type premises…".