Overview
EN ISO 22477-2:2023 - Geotechnical investigation and testing: Part 2 - Testing of piles: static tension load testing defines the specifications for executing static axial pile load tests where a single pile is subjected to an axial static tensile load to determine its load–displacement behaviour. Applicable to vertical and raking piles and to all pile types, the document is limited to maintained load tests (cyclic tests are excluded). It is intended to be used in conjunction with EN 1997-1 (Eurocode 7) for design-related partial factors and correlation factors.
Key topics and technical requirements
- Scope and applicability
- Tests for checking pile performance and measuring pile tensile resistance.
- Covers test piles and working piles; applies to all pile materials and geometries.
- Equipment and calibration
- Requirements for reaction devices, force input systems (e.g., jacks), and calibration of force-measuring systems (references include ISO 7500-1).
- Measurement systems for pile head displacement and applied load, plus pile instrumentation guidance.
- Test procedure
- Test preparation: protections, construction/selection of test pile, and scheduling.
- Loading procedure: description of load step sequences, maintained load steps, maximum test load considerations, and measurement intervals.
- Special attention to creep behaviour, creep rate assessment and definitions used to characterise critical creep load in tension.
- Data recording and reporting
- Minimum data to include in the test report and interpretative report: general project data, test setup, measured load–displacement data, instrumentation and conclusions on pile resistance.
- Limitations
- The standard excludes cyclic load tests and is focused on single-pile axial tension testing.
- Reference integration
- Specifies normative references (EN 1990, EN 1997-1, EN 1997-2, ISO 7500-1) and harmonises test outputs with Eurocode design practice.
Applications and users
Who uses EN ISO 22477-2:2023:
- Geotechnical and foundation engineers validating pile design and capacity.
- Testing laboratories and contractors performing pile load tests on-site.
- Design offices using measured pile resistance to derive characteristic values for design (in conjunction with EN 1997-1).
- Clients, site supervisors and regulators needing standardized, auditable test procedures for quality assurance.
Practical applications:
- Verifying that installed piles meet design assumptions.
- Determining tensile capacity for uplift-sensitive structures (e.g., foundations for tanks, masts, marine structures).
- Producing test reports for design validation, permitting and contract acceptance.
Related standards
- EN 1997-1 (Eurocode 7) - Geotechnical design: partial factors and correlation factors for deriving characteristic values.
- EN 1997-2 - Ground investigation and testing.
- ISO 7500-1 - Calibration and verification of force-measuring systems.
Keywords: static pile load tests, static tension load testing, pile testing standard, pile load–displacement, geotechnical investigation, EN ISO 22477-2:2023.
