Hollantlaan, Utrecht

PROJECTS - Hollantlaan, Utrecht

Referenct project : Hollantlaan, Utrecht
Client: Tons Vastgoed
Date executed: juli-augustus 2006
Duration: 45 days

  

Description of the project:

On the furniture boulevard in Utrecht Tons Vastgoed BV is creating a new shopping centre that has cellars underneath it. Because of the high groundwater level and the restrictions imposed by the government regarding pumping, it was necessary to make a horizontal connection to the construction pit. The major advantages of water glass injection over underwater concrete were:

- not using underwater concrete limited the excavation depth, so grouted anchors were not required and adjoining sites could remain unaffected by the consequences of the construction activities.
- the water glass injection meant the excavation could be carried out in stages, thus reducing movement of soil to a minimum.
- dry excavation of the construction pit meant the nuisance to surrounding business was kept to a minimum. Using water glass injection considerably reduced the amount of soil to be removed as there was no excavation needed for underwater concrete.
- vertical tension elements could remain absent, because the injection layer was put at such a depth that there is a balance between the rising groundwater pressure and the downwards weight of the ground above.

The construction pit had an area of 3.200 m². The difference in groundwater level created was about 4 metres. The total surplus water during the construction was only 4 m³ per hour!