Dynamic load test and rapid load test on two large diameter steel pipe piles with double crossed steel ribs inside the pile bottom section
Authors/Creators
- 1. Jibanshikenjo Co
- 2. Tokyo Port Construction Office
- 3. Port and Airport Research Institute
Description
Tokyo International Cruise Terminal, a four-story passenger ship terminal, was constructed at the Tokyo Bay area in
2020. The terminal building is on the jacket-type pier foundation supported by large-diameter steel pipe piles (SPPs)
having an outer diameter (Do) of 2 m. A very soft sediment exists below the seabed to a depth of about 35 m. The
surface soft layer is underlain by a gravel layer of 4 m thick and a mudstone layer having SPT N-values greater than
50. In order to estimate an appropriate embedment length of SPP in the gravel layer or the mudstone layer, rapid load
tests (RLTs) were carried out on two SPPs having a length of 57 m (Pile 1) or 62 m (Pile 2). For both SPPs, double
crossed steel ribs (#-shaped ribs) were welded inside the piles along the bottom 5 m section. Both piles were
instrumented with strain gages at 8 levels to obtain axial forces during RLTs. High plugging was observed in both piles