So the foundations for these new-build dwellings are completely made of pre-cast elements (driven piles and foundation beams). As a result, actual construction time on site can be reduced considerably. Less effort is needed from production personnel and the combination of pre-cast concrete sections and this pile system also provides extra benefits.
The recommendations relating to the foundations show that the soil survey incorporated 45 soundings. This means that the soil structure has been investigated to a depth of at least 30 metres beneath mean sea level at Amsterdam (NAP). So the soil structure can be interpreted as follows:
0.0 to 5.0 metres below NAP: clay and peat
-5.0 to -11.0 metres below NAP: sand, packed to various degrees of compactness
-11.0 to -17.5 metres below NAP: clay, sand-like material and sand, packed loosely to relatively compactly
-17.5 to -30.0 metres below NAP: sand, packed compactly to very compactly
To comply with both the requirements of relative rotation and the maximum permissible pile cap sag, pile foundations are an option, given the soil structure. The foundation recommendations assumed pre-cast concrete piles. The pile-driving work required for installation of the concrete piles will create vibrations. The risk of damage at this particular site is generally small, if heavy-duty pile driving work can be avoided within a zone of 10 – 20 metres from adjacent land. However, it is inevitable that a certain level of vibration hindrance will be created.
The recommendation report also states that the pre-cast concrete piles must be installed by a company specialised in this field. Add up the benefits of the synergy between Vroom Funderingstechnieken and Vroom Betonbouw, and you soon come to the conclusion that you’re getting the best of both worlds.
Watch our 3D animation on assembling pre-cast foundation beams here.
