Recently, preliminary piles have been tested for the foundation of a new building ‘Sonate Adagio’ at the centre of The Hague. The so called HEKPiles have been tested with Allnamics StatRapid, according to the new Dutch codes NPR7201.
In the Spuikwartier, a quarter near the centre of The Hague, three new construction towers are build. These buildings will consist out of a hotel, commercial areas and housings. For the construction of the foundation of one of these towers, cast in situ bored piles have been applied. These bored piles are so called HEKbuispalen. A temporarily casing is screwed in the ground. At penetration depth, the casing is filled with concrete and the casing removed.
To check the quality of these piles, and especially the bearing capacity, Allnamics have performed Rapid Load Tests on a number of piles. Using the StatRapid device, a number of piles could be tested, even in one day.
In the piles, a number of sisterbars have been casted at different depths of the pile. Sisterbars are strain sensors, especially developed to measure strain (and thus force) at several depths in the pile. By analysing the measurements from during the load test, the distribution of the load over the pile length can be determined.