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Título

The Benefits of Pile Driving Monitoring for Precast Concrete Piles

Palavras-chave

Pile Driving Monitoring, Pile Driving Analyzer (PDA), Precast Concrete Piles, Pile Damage, High Strain Dynamic Pile Test (HSDPT)

Resumo (no máximo 200 palavras)

Compression and tension stresses may occur along the pile shaft, and these values may not exceed the concrete strength, avoiding damage to the piles. This paper shows a case study in which pile driving monitoring was made using the Pile Driving Analyzer (PDA). 17 cm-square precast concrete piles for a workload of 30 tons were driven by a 2.8-ton free-fall hammer with a 30cm drop height. The PDA data collected during the pile driving indicated that the compressive and tension stresses were acceptable (23 MPa and 3.0 MPA, respectively). However, when the pile reached 5.0m depth, the pile refusal was 10mm/10 blows, and the pile capacity was lower than expected (55 tons). Therefore, the pile testing engineer decided to increase the drop height to 40cm, and the compression and tension stresses increased to 28MPa and 3.2MPa, respectively, and were acceptable. Moreover, the pile length increased to 5.5m with a pile refusal of 10mm/10 blows, and the pile reached the ultimate load of 62 tons. This case study shows the benefits of pile driving monitoring: install the piles to the design depth with a drop height that may not exceed the concrete strength, achieving the desired pile capacity.

Palavras Chave

High Strain Dynamic Pile Test (HSDPT); Pile Damage; Pile Driving Analyzer (PDA); Pile Driving Monitoring; Precast Concrete Piles

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