The aim of this preliminary research is to study the precision of pile foundation position compared to its original designed location. Before the installation of steel pipe piles for this project, the subcontractor found that the present vessel and equipment could not fully satisfy the plan twist angle and inclination requirements as shown on the detailed design drawings. Adjustment to the twist angle was needed for individual piles in some pier locations. In connection to the pile positions after the adjustment, this research has compared the pile forced loads with that of the original layout, and found that the structural impact is very insignificant due to the change in twist angle. It is confirmed that the revised pile group layout is acceptable. The relevant detail design is still applicable and amendment is unnecessary. The recommendation of this research could be adopted for the similar huge marine structures which installed large diameter steel pipe piles.
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