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Driven precast concrete pile
Construction sequence
1. Positioning of the prefabricated concrete pile
2. The pile is driven into the soil with an impact pile driving hammer (diesel hammer or hydraulic drop hammer).
Special timber packing or a synthetic cushion block lends adequate protection to the pile head during driving.
3 & 4. With control of driving achieved by measuring the set, the pile is driven into the resistive soil layer to a depth equal to one time the pile diameter.
Good control of the drivability and execution in general thanks to integrity measurements.
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Fields of application
• Ideal solution for cost-effective piling in homogeneous geotechnical conditions and for carrying low to medium loads
• Extensive preliminary soil investigation is required in order to determine both the nature and the behaviour of the layers of soil
• Wide range of applications
• Given the prefabrication and the delivery time of the precast piles, the pile must be dimensioned depending on the definitive pile load and the soil conditions before execution
• Adequate solution for soil profiles with very weak resistances in the upper strata, where excess use of concrete can be expected when installing cast-in-situ piles
Environmental impact
• A pile driving permit is requested
• Causes noise pollution
• No soil removal (soil displacement pile)
• A stable, dry and flat work platform is required, also accessible for freight traffic (the piles manufactured in the factory are delivered on site)
Technical specifications
• The section sizes vary currently between 180 x 180 mm² and 450 x 450 mm²
• Coupling using mechanical interlocking joints is possible
• The maximum length depends on the section and the transportation possibilities
• High quality of concrete, usually prestressed
• Soil displacement pile with a smooth shaft
• Allowable bearing capacity between 325 and 2.050 kN
• The rake depends on the equipment: Inclined piles with an inclination reaching 1/3 at most
• Quick installation.