Curtain Injection

For a curtain injection first of all a raster of packers has to be set up. The raster should overtop the highest assumed level of ground water. The distance of 30cm in-between the packers is just an average. It is recommended to perform a test injection in order to check the distribution of the gel, which is heavily dependent on the ground structure.

The injection procedure is always carried out evenly from one side to the other and from the bottom upwards in order to be able to build up a smooth and even curtain. In the process it is essential that every packer is injected repeatedly.

The initial injection stage will more or less penetrate the back filling material. After the material has been hardened, the second injection stage can be carried out that now leads to a rather more even surface distribution of the acrylate gel due to the flow restriction of the initial stage.

The third stage will then finally achieve the actual required sealing tightness because the material is predominantly evenly distributed over the surface as pure gel (without sand). The required quantity of material as well as the necessary number of injection stages is dependent on the permeability of the ground.