Download Method Statement for O-Cell Test on Bored Piles

What is an O-cell test?
An O-cell test is a type of static load test that is used to determine the load-carrying capacity of deep foundations, such as piles and drilled shafts. The test is performed by installing a hydraulic jack within the foundation element and then applying a load to the jack. The load is increased in increments until the foundation fails or reaches a predetermined maximum load. The results of the test are used to design the foundation element to safely carry the loads imposed by the structure that it supports.

How does an O-cell test work?
The O-cell is a specially designed hydraulic jack that is installed within the foundation element. The O-cell has a circular cross-section and is open at both ends. The jack is filled with oil and has a piston that moves back and forth as the oil is pumped in and out of the jack. The piston is connected to a load cell, which measures the load that is applied to the foundation element.

The O-cell is installed in the foundation element in such a way that it isolates a portion of the foundation element for testing. The load is applied to the O-cell, and the load cell measures the load that is applied to the foundation element. The movement of the foundation element is also measured using strain gauges or telltales.

What are the benefits of an O-cell test?
There are several benefits to using an O-cell test to determine the load-carrying capacity of deep foundations. O-cell tests are:

Accurate: O-cell tests are very accurate, as they directly measure the load-carrying capacity of the foundation element.
Efficient: O-cell tests can be completed in a relatively short period of time, compared to other types of load tests.
Safe: O-cell tests are safe to perform, as they do not require the use of heavy equipment.
When should an O-cell test be used?
O-cell tests should be used when it is important to accurately determine the load-carrying capacity of a deep foundation. O-cell tests are often used in the following situations:

When the foundation element is large or complex
When the foundation element is located in poor soil conditions
When the foundation element is supporting a critical structure
Conclusion
O-cell tests are a valuable tool for engineers who need to accurately determine the load-carrying capacity of deep foundations. O-cell tests are accurate, efficient, and safe, and they can be used in a variety of situations.