Re-use of Old Pile Foundations in AmsterdamÂ-PPT Presentation

PPT Presentation

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The paper examines the reuse of existing pile foundations as an alternative to replacement when buildings or infrastructure are renovated. Reuse can reduce material consumption, cost, construction time, vibration and risks to neighbouring structures. It is especially valuable in dense city centres, where access for heavy equipment is limited and new piles may be difficult to install.<br /><br />Reuse changes the design process: instead of designing foundations for a new structure, engineers must first establish whether the existing foundation can safely support its future loads. This requires reviewing historical records, inspecting the structure and foundation, assessing signs of settlement or damage, and evaluating pile condition and capacity. Load tests—including static, rapid and dynamic tests—can help quantify performance and reduce uncertainty.<br /><br />Two case studies illustrate the approach. In The Hague, an early-1900s building was assessed for conversion to a store and apartments. Historical research, façade observations and foundation excavation helped explain uneven settlement. The foundation was retained, with a stiff ground-floor slab added to redistribute loads and cracks repaired.<br /><br />In Amsterdam, timber piles supporting 17th-century canal bridges were inspected and tested. Static tests on 12 piles found capacities ranging from 75 to 420 kN—often substantially higher than expected. Some piles were damaged or displaced, but the findings suggest that reuse may be feasible; further study is underway to develop a model for assessing other city foundations.<br /><br />The cases demonstrate that existing foundations may be in better condition and have greater capacity than assumed. Careful investigation can make reuse a practical, economical and sustainable option, but it requires a bottom-up design process and appropriate geotechnical expertise.

Keywords

pile foundation reuse

foundation assessment

geotechnical engineering

load testing

static pile test

foundation rehabilitation

structural renovation

city centre construction

timber piles

sustainable construction