Tony Geldart

Thanks Barnabas, I was hoping that someone could say the worst ground in Melbourne would be ( say Coode Island silt) and that would be 50kPa, on top of that we always allow minimum 10kPa for machinery and some times up to 20kPa. Short term shoring in the ground is up to two weeks. Most jobs are pipe laying, manholes or small pre cast pump stations, which would all fall into the two week program. In the USA they have tabulated data in PSF, which is used up to 6000mm in depth any where in the USA, over 6000mm they require Temporary works designs. I was hoping for something similar, as this would make life safer and easier for contractors. We have shields from 1200mm, 2400, 3000, 3600, 4000,5000,6000,6600 to 7200mm long with WLL from 20kPa to 120kPa (on the 4000mm box) Anyone else got any thoughts on this for me? Appreciate you help. Tony

Thanks Rahsn , you are correct, we used to have an in house engineer, but unfortunately we no longer have full time work for an engineer. I would have thought that Coode island silt wet ground would be higher than 40kPa Thanks Tony

Would anyone know the worst ground condition in Melbourne and the kPa rating that would be required from a trench shield at say 6000mm depth. I require the information for our trench shoring system LITE guard. With this information we can state that anywhere in Melbourne at up to 6000mm depth the worst case scenario would be 50kPa or 80kPa and supply shoring to suit. Over 6000mm we would then recommend a soil report and engineering for a suitable shoring system. This knowledge would make it much easier for contractors to ensure they get suitable shoring every time if they cover for this depth and WLL. Any information would be appreciated.