Low Strain Pile Integrity Testing

Low Strain Pile Integrity Testing (PIT) is an indispensable non-destructive method for evaluating the homogeneity and integrity of single piles, ensuring the long-term suitability of foundations.

The Importance of a Low Strain Integrity test

In the construction industry, ensuring the integrity of concrete piles is crucial for safety, sustainability, and operational efficiency. With PIT, clients and contractors are provided with information to assist in identifying significant anomalies in piles, mitigating risks that could compromise structural stability and lead to costly repairs or failures. This testing method supports quality assurance, helping to maintain high standards and comply with regulatory requirements.

We employ cutting-edge equipment that meets ASTM D5882 standards and holds UKAS accreditation (Cert.Nr. 0001). Our strategically located site operatives across the UK can respond swiftly to meet your immediate testing needs, ensuring minimal disruption to your project timeline.

Low Strain Pile Integrity Testing

Our Approach

We combine the expertise of our experienced site operatives with advanced testing equipment to deliver precise and reliable results. Our hands-on, plain-speaking problem-solving approach ensures that every pile tested meets stringent quality and safety standards. We distil complex data into clear, actionable reports, empowering our clients to make informed decisions about their construction projects.

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PIT is conducted using either a hand-held non-instrumented hammer (time domain) or an instrumented hammer with a force transducer (frequency domain) to induce a small stress wave that travels axially down the concrete pile. Reflections from impedance changes are captured by a pile top accelerometer.

The captured traces from the stress wave are analysed by our experts who examine the data to identify any significant anomalies that could affect the pile's integrity.

We provide a comprehensive factual report for the end user. This report details the findings from the site visit and includes any necessary recommendations.

PIT is one method within a family of stress wave techniques offered by SOCOTEC. PIT is known as a Low Strain method as it utilises a hand held hammer impact. High Strain methods use a larger drop weight system more commonly known as Dynamic Pile Load Testing. Both methods use one-dimensional wave theory. 3 Dimensional wave theory is utilised in Ultra Sonic methods such as Cross Hole Sonic Logging.

PIT is conducted after pile installation. Typically, after a 7 day wait period to allow the concrete to gain sufficient strength. Prior to a site visit the pile head surface is shall be accessible, above water, exposing a sound surface and clear of debris. It serves as a critical quality control measure before proceeding with further construction activities.

In such scenarios, as detailed above, typically 20 to 30 piles can be assessed per hour. After the site visit, additional time is required for data analysis and preparing the comprehensive factual report for the end user.