CFA Piles
O-cells® have been successfully installed in CFA piles to depths exceeding 45 m. Installation of the O-cell does not change the typical CFA pile construction method, however, a modified grout mix is recommended to ease placement into the fresh grout immediately after pile construction. Applied loads on CFA piles have exceeded 30 MN and higher loads are anticipated in the future due to innovative construction techniques.
The O-cell is used in production (proof tests) and non-production (preliminary test) piles attached to the pile/shaft’s reinforcing steel cage. There are numerous advantages to using the O-cell method of load testing an Augercast (ACIP) pile when faced with one of the following site conditions; off-shore, a confined area, high loads, rock sockets or piles with deep cutoffs.
Since the end bearing and the upward shear resistance are measured independently, there is no guesswork in how much load was carried by each component. Testing is typically performed until the ultimate capacity in either shear or end bearing is reached, so the maximum unit loads can accurately be obtained. The addition of strain gages within the shaft/pile can help in determining the distribution of load throughout the shaft length. An O-cell load test also provides information about creep limit loads in shear and end bearing. As required, LOADTEST can provide, or assist you with preparing a complete report documenting the O-cell test data and results. We routinely provide the equivalent top load movement curve.
Click here to see results from an augercast (CFA) O-cell test.
See our European Foundation - Loadtest CFA article here
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