In May 2015 Allnamics performed Pile Driving Analysis (PDA) during the installation of the monopile foundation for The Wash Tide Gauge (WTG), near King’s Lynn, UK. Monitoring was executed using the PDR-system developed by Allnamics.
The location of the Tide Gauge is in the waters of The Wash National Reserve, approx. 18 km northwest of King’s Lynn and approx. 12 km north-northeast of Sutton Bridge, in English territorial waters. The monopile was 40.5 m long with a diameter of 2 m. It was stabbed using a PVE105M vibrator and then driven to the design depth with an IHC S500 impact hammer.
Monitoring was performed using Allnamics’ wireless PDR system. Because the pile head submerges at high tide, the pile had been instrumented with Under Water (UW) accelerometers and strain transducers to allow Pile Driving Analysis. These sensors and the associated sensor cables were mounted on the pile prior to transport to the job site. On the day the pile was driven into the sea bed, the PDR was mounted and connected to the sensors. The system recorded for each hammer blow all relevant data, incl. the transferred energy of the hammer, the stresses in the pile and the dynamic pile resistance. The testing campaign also involved subsequent analysis of the End Of Driving (EOD) blow using signal matching in order to calculate the pile capacity. This signal matching analysis was performed with Wave Equation software AllWave-DLT, developed by Allnamics.
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