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An alternative silent, vibration-free pressing solution may be offered by the used of a telescopic leader rig fitted with a hydro-press attachment. Our extensive range of rigs each have a 360 degree tracked base unit to which a telescopic mast is fitted. Attaching a hydraulic press that applies a ‘downward’ force of up to 80 tonnes allows pressing of the steel sheet pile into the ground without vibration. Sheet piles are installed in panels of four, simultaneously.
The downward pressing force requires an equal and opposite reaction. Most of this reaction force is provided by the combined weight of the rig, down-crowd hydraulic force and skin friction against previously installed sheet piles. As the penetration of the pile panel advances, the skin friction between the reaction piles and the ground becomes the key factor in developing an adequate total reaction.
Once all of the piles in the group are advanced by the full stroke of all the hydraulic cylinders, the entire pressing devise retracts ready to repeat the cycle. With the pile panel installed, the next panel of four piles can be positioned and the whole process is repeated.
The leader rig guides and provides excellent pile alignment that minimises interlock friction, therefore creating a robust method of installation.
The hydro-press system can be used in both cohesive and cohesionless ground conditions. In the event of stiff to medium dense ground, pre-augering the pile line prior to installation will loosen the soils, so that the hydro-press method can be utilised.