UK Piling Contractors Derby

Testing

Static Load Testing

This involves the direct measurement of pile head settlement in the response to a physically applied test load. The test can be carried out to suit loading categories relating to compression, tension and lateral configurations.

The load is normally applied by means of a hydraulic jack acting against a reaction beam which is restrained by an anchorage systems consisting of either piles or a dead weight reaction mass (Kentledge). The specified test load is then applied in a series of increments in accordance with the piling specification.

Each incremental load is sustained for a specified period of time or until the rate of pile head movement is less than a nominated value.
The pile settlements and the residual recovery at each increment are plotted and the resultant load-settlement curves are used to assess preliminary design assumptions and confirm performance criteria.

It is essential on most piling contracts that some form of testing is carried out to ensure pile design assumptions and load bearing capacities are compliant with the specification.

It is normally good practice to agree a specified testing regime prior to commencement of the piling works and one that relates to the method of installation, specific geotechnical risk, variability of ground conditions and the local experience of the piling contractor. We also offer advice and guidance to ensure that the most appropriate and cost effective method is always adopted for your project.

Our testing is carried out by Independent and Specialist Testing Contractors who are fully conversant with the requirements contained with the ICE Specification for Piling Works and Embedded Retaining Walls

Dynamic Load Testing

High strain dynamic pile testing is performed using the hammer on the piling rig to provide an estimation of load bearing capacity. The test is performed by attaching strain gauges and accelerometers to the top of the pile that are used to record the wave signal imparted during the test blow onto a Pile Driving Analyser (PDA).

The response from the hammer blow is monitored in terms of the force and velocity of the stress wave. This information is evaluated using both the case and CAPWAP software programmes to estimate the load bearing capacity and can provide further details on pile integrity, pile head settlements, hammer efficiencies and resistance distribution of the toe and the pile shaft.

The pile tests can be carried out during installation or shortly afterwards to give an early estimation of the pile performance and to provide confidence that the piling works can progress as planned. The results are more or less instantaneous and can provide an economic and comprehensive alternative to traditional methods of load testing.

Pile Integrity Testing

Is also known as low strain dynamic test, sonic echo test, and low strain integrity test. One of the methods for assessing the condition of piles or shafts. It is cost effective and not very time consuming.
Pile integrity testing using low strain tests such as the TDR (Transient Dynamic Response) method, is a rapid way of assessing the continuity and integrity of concrete piled foundations.

The test measures: Pile length, or depth to anomalies. The test requires minimal of preparation and is able to find defects corresponding to cracks, reductions in section and zones of poor quality concrete.

This procedure is performed with a hand held hammer to generate an impact, an accelerometer or geophone placed on top of the pile to be tested to measure the response to the hammer impact, and a data acquisition and interpretation electronic instrument.

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