Diaphragm wall methods
To transport solids out of the trench and to stabilize the cutter-excavated diaphragm wall, a bentonite suspension is used (as well as polymers in some cases). The model SKC 30-K mixer is used to manufacture this slurry. This mixer generates an optimal, colloidally dispersed slurry. This slurry can be used immediately, as subsequent swelling through colloidal mixing no longer occurs.
1. Trench cutter BC-system
2. Fräspumpe
3. Desanding plant BE 500 / BE 600
4. Vorratstank ST 25-H / ST 35-H
5. KBKT pump
6. Feststoffaustrag
7. Pump BP 125 / BP 250
8. Bentonite Mixer SKC 30-K
9. Bentonite Silo
10. Screw conveyor FS 219-4500
11. Wasserzugabe
Using the pump installed in the cutter, the solid is extracted together with the slurry during the cutting process in the trench and pumped off to the desanding plant. This plant then continuously separates the solids up to a certain grain size (60 µm to 20 µm, depending on the version) out of the slurry. As a result, this cleaned slurry can be pumped directly back into the cutter-excavated trench within the closed circuit.
If this includes soil fractions smaller than 20 µm, it is possible to clean these down to 10 µm using the BD 90 decanter, or to separate all solids from the fluid by adding flocculating agents. Our model BP range of centrifugal wheel pumps is available as pumps for feeding/distributing the slurry.
The slurry tanks under the separation systems of model ST are outfitted with agitators so that the slurry or solid particles inside the slurry are either kept in motion or fed to a pump organ, depending on the application. Horizontal or vertical agitators are available for this purpose.
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