Get Adobe Flash player

Rapid Load Testing

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.

 

Rapid Load Test code published by BSI

 

The BSI (British Standards Institution) has recently published the code for RLT in the UK (BS EN ISO 22477-10:2016). This code describes  Geotechnical investigation and testing; Testing of geotechnical structures; Testing of piles: Rapid Load Testing (RLT).

 

The StatRapid is fully compatible with this code and can be used to determine the static bearing capacity and load settlement behaviour of foundation piles.
 

The code can be purchased in the web shop of the BSI.

http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030292492

 

For more information on StatRapid or Rapid Load Testing you can always contact Allnamics.

 

Do you want to read more about RLT on our website? Click here to search for RLT.

 

StatRapid testing at Yara Sluiskil

 

On the 4th of July 2016 Allnamics checked the capacity and stiffness of 4 production piles (Fundex-type), commissioned by contractor Ballast Nedam Industriebouw BV.

 

The piles are part of the tank foundation for the UREA Granulation 8 Project on the production yard of Yara in Sluiskil, the Netherlands. Rapid Load Testing system StatRapid has been deployed, with which, following CUR guideline 230, the load-displacement behaviour of the piles has been determined.

 

The proof load testing was a contractual requirement and the (positive) results are regarded as representative for the entire tank foundation. Consequently the foundation slab has been cast with high confidence in the foundation design.

str_sluiskil_yara