Roger Bullivant has used its RB Drillbar Piling System to help shore up Saudi Arabia’s Sharq petrochemical plant. It has used the method to help protect recently built pipe rack foundations, surge basin and cable trenches at the plant in Jubail.
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Pipe rack bases had settled by as much as 800mm and voids formed underneath a cable trench and the surge basin were causing concern to client Shaw Stone & Webster at the Sharq Third Expansion Project.
Following site tests to determine the cause of these settlements Roger Bullivant engineers used a variety of methods to stem the settlement.
These included pressure grouting to fill voids beneath the cable trench and surge basin, installation of 53 soil mixed grout columns under the basin and the construction of 109 mini piles to the pipe rack foundations. Piles ranging from 200kN to 300kN were installed using its Drillbar method to depths of up to 15m.
Produced through a rollformed sectional hollow tube, connected together with couplers and boasting a cutting head at the leading end the Drillbar acts as a rotational percussion drill string with a continual pressure concrete grout flow. It also acts as the permanent reinforcement to the pile once it has reached the required depth.