For this project in Zwaag, Vroom Foundation Technology was responsible for groundwork, dimensioning, piling and the construction of the foundation that has been realized partly traditionally and partly as prefab elements. The concrete floors have been poured and the project has now been completed.
In the old heart of the village of Zwaag, on Dorpsstraat, Vroom delivered the total package for Bouwkroon. From the very beginning, Vroom was involved in this project, even before the existing residence was demolished. This allowed Vroom as the foundation expert and deliverer of a total foundation technique package to think along. All possible hurdles that might stand in the way of a fast realization have been acknowledged and eliminated in an early stage.
Solutions have been invented for soil transportation, unloading and temporary storing the foundation piles on a small and difficultly accessible site and setting up a large and heavy 400 tons crane including the necessary temporary road blocks in order to place three prefab basements.
Groundwork, dimensioning, piling
The activities began with the flattening process of the site. Subsequently, because of the capacity, the piling work was done from the current ground level which meant that the prefab CFA piles have been inserted in-depth. Given the circumstances on the site and the entrance, the piles have been unloaded with a crane and stored on the site. Following the piling work, the groundwork was done. Between the piles, the soil was dug away until the level of the bottom of the foundation beam. Subsequently, a layer of sand was applied to cover the soil. After the foundation was applied, the soil was dug off further on the location of the planned basements. The beam frame gave support to the surrounding soil. The large released quantity of ground was transported away to keep the situation on the site workable.
Prefab and traditional
After the groundwork was completed, the prefab foundation construction of the residence was mounted. The mounting process of the foundation beams for the residence took one part of the day. The same day, the mounting process of the residence was finished. Less than one day later, dams to the basement could be applied making sure that the basement stays dry at the constant soil water level. The foundation for the annex building was realized as a traditional foundation system. Opting for a traditional foundation system instead of a prefab one had to do with the time that was available. The application process for a license for the annex building would continue until a few weeks before the start of the activities which meant that not enough preparation time would remain in order to realize the prefab project on time without stagnation.
After the license was given out, a direct start could be made with the poured foundation. Directly after applying the prefab foundation construction for the home, the realization of the foundation for the annex building followed. The foundation includes rabbets to which the basement has been connected.
Basements
In conclusion, three basements have been mounted in one day. One basement is located underneath the residence and two are underneath the annex building. For the annex building, the choice for a 2-basement combination has been made as 1 basement forms the actual swimming pool whereas the second basement harbors the technical tools.
The location did not offer space to set up the crane on the building site. It could, however, be set up on the road next to the site. Between the road and the building site was a grove and a ditch which meant that the heavy 28 tons load had to travel over a fair distance.
A 400 tons crane had to be deployed and the set-up process required a roadblock that also involved the bus lane in order to make the mounting process possible. The 3 basements have been delivered exactly on time and have been mounted directly from the truck. The mounting process of the basements could be completed within less than one day.
Facts & numbers
Project 48214 and 53508
Location: Dorpsweg 6, Zwaag
Client: Bouwkroon BV Oosterblokker
Architect: Ontwerp en Tekenburo Gertjan Dekker Oosterblokker
Constructor: Adviesbureau WFO Wervershoof
Foundation activities
Pile specifications
53x prefab CFA piles
Square: 250 mm
Length: 21 m
Prefab foundation specifications (home)
Dimensions W x H
350 x 500 mm, 55 m total
450 x 500 mm, 66 m total
Traditional foundation specifications (annex building)
Dimensions W x H
350 x 400 mm, 43 m total
450 x 400 mm, 22 m total
Prefab basement specifications
Dimensions W x L x H
6800 x 3200 x 2450 mm, wine cellar
7100 x 3200 x 1700 mm, swimming pool
3800 x 2600 x 1700 mm, technical cellar for the swimming pool
Pouring facilities
Foundation: HSF pipe units, pipes Ø100mm
Basements: pipes, spots, jetstreamers
