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Vibratory Driven

Do steel tubes installed by a vibrator have bearing capacity?

 

Of course! But the real question is: How much? And what will be the load displacement behavior? For a project of TenneT such piles have been tested near Breukelen (NL). The chosen proof load test method was Rapid Load Testing. Typically a job for the Rapid Load Tester of Allnamics, the StatRapid.

 

The steel tubular piles were part of the temporary foundation for a Mammoet mega crane. The load to be lifted over the railway line Amsterdam-Utrecht was a 325 ton transformer. Because insufficient load bearing capacity and/or large deformations could lead to disastrous consequences for the stability of the crane, it was vital to test the piles in advance.

 

It was requested to test as many piles as possible during a normal working day. At 7 am the work could be started with setting up the StatRapid device and at 5 pm testing had to be finished. During this 10 hour period as many as five piles were subjected to multi-cycle load tests. After testing the last pile, the StatRapid device was disassembled and well before dark all the equipment and testing and support teams had left the site.

 

Photo 1 : The assembly of the StatRapid device with the optical displacement monitoring system Reyca in the front

 

Video of setting up the StatRapid for the first test pile.

 

Photo 2 : Testing piles near the railway track

 

In conclusion, thanks to the good cooperation between Allnamics, Gebr. Van 't Hek, VROOM Funderingstechnieken, Joulz and Mammoet, five piles could be tested in one day, all with a positive result. The lifting operation of the transformer was carried out successfully two weeks later.

Photo 3 : The ‘real' test whether the piles where able to carry the full load.(Source: Light at Work Photography, Jorrit Lousberg c.b. TenneT)

 

Do you want to learn more about this project? Click one of the links below.

 

http://www.tennet.eu/nl/nieuws/nieuws/spectaculair-transport-van-loodzware-transformator-naar-breukelen/

 

http://www.tennet.eu/fileadmin/user_upload/Our_Grid/Onshore_Netherlands/Factsheet_Breukelen_SEP2016_web.pdf

 

Do you want to know more about Rapid Load Testing? Please contact Allnamics.