When the sheet pile walls have been placed it is time for the Soil-ID men to start their work. The prepared sheet piles are pushed into the ground with a big crane and a vibratory hammer. De depth of the sheet piles depends on two factors:
- To what level the construction pit needs to be excavated
- At what level the water-repellent layer needs to be, as determined by soil investigation
Our staff determines a plan based on this data. See Advice.
The injection tubes are placed with the same installation with which the sheet piles are placed (a cost advantage can be achieved this way, see Construction pits). A sheet pile is used with two shafts in it. A tube is placed in each shaft, so that simultaneously two tubes can be placed into the ground. Then the installation moves about a metre and the procedure repeats itself.
The pattern of the injection points is determined in advance. This so-called injection matrix is accurately executed with GPS-technique. Certainty and accuracy before anything.
While the rest of the tubes are still being placed, the first placed tubes are be connected to the injection container, developed by Soil-ID, and the actual injection can start. In series of eight up to sixteen the injection tubes are connected to clearly recognizable blue transport tubes that are joined with the injection container.
The injection container has an operation and a control unit, as well as a mix and pump installation. From here the mixture of water, water glass and hardener is accurately dosed and transported to the injection points and pumped into the ground. When a spherical body of the mixture with a cross-section of 1 metre is formed into the ground, the injection automatically stops. These spheres together form a water-repellent layer as a kind of carpet. This layer can be loaded and reached its full strength after a week. If necessary the injection tubes can be removed, also two at the same time.
The Soil-ID method
- Placing sheet piles
- Placing injection tubes with a sheet pile
- Connecting and filling injection tubes
- Applying water-repellent layer
- Dry Excavating