Test – Insertion of anti-piping screen
The Limburg water authority is working on a test with innovative plastic anti-piping screens. The test started in October. The results will be available at the beginning of next year.
Piping is an important failure mechanism of dikes. Water passes via a layer of sand under the dike and surfaces again at behind it. Due to the fact that sand is transported along with the water, a duct (pipe) is created under the dike, which could seriously weaken the dike or even collapse it.
To counteract this situation, the water authority is investigating the insertion of plastic anti-piping screens. The screens are a promising innovation, but can they be inserted in the soil in a reliable manner? Together with the screen supplier and various contractors, the screens with a dimensions of three to six metres are inserted in the soil. The screens are inserted whilst using, among others a hoe and small pile-driving rigs, possibly in combination with fluidisation material (by blowing or flowing a gas or liquid against the ground pellets from below, the granules move, creating space to bring the screen further into the ground). The idea is that if it succeeds in the hard soil of Limburg, it will work all over the Netherlands. The findings will be published at the beginning of next year.