Dike foot protection

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A dike foot protection is an additional protection of a dyke loaded by water pressure .

If the water acts on the dyke body with great pressure during a storm surge or flood , this can lead to seepage. Heavy rainfall can aggravate the softening of the inland dike embankment. The dike is becoming more and more unstable. The consequence of such a softening of the dike can then be a slope failure .

principle

In order to secure the dike, the entire area of ​​the reinforced seepage is first covered with a water-permeable mesh tarpaulin. Then a counter load with sandbags is placed on the dike foot. The sandbags are placed up the slope starting from below. The lower half of the damaged area must be more heavily loaded than the upper half. In the upper area of ​​the infiltration, the embankment must not be weighed down by sandbags or stressed by other forces.

The dike, which has already been damaged by the soaking, must on no account be walked unnecessarily. The existing sward must not be further damaged. In particularly critical locations, the use of a dike ladder is an advantage. Construction boards and shelving boards can be used to build makeshift paths to get the sandbags to the damaged area without stressing the sward. If the dike is particularly spongy, the delivery of the sandbags by helicopter can be dangerous. The air pressure generated by the rotor can lower the dike in the damaged area.

construction

  • Lay out on the dike: water-permeable mesh tarpaulin or geotextile
  • In the first layer: leave a 5 cm joint every two bags! This creates drainage and the seepage water can escape.
  • In the second layer: put sandbags across the first layer! Dense association. Contact weight.
  • In the third layer: place the sandbags across the second layer. Dense association. Contact weight.

When packing of the first sand bag layer is important to ensure that in each case a gap for the discharge of the bag between two vertical rows of leachate from top left to bottom throughout. The joint should be a maximum of 2–3 cm wide. The drainage joints can be laid across or along the dike. The second layer of sandbags above this joint must be laid across. The number of bag layers depends on the strength of the seepage and the instability of the dike floor. This combination of water-permeable tarpaulin, drainage and sandbag causes. that the dyke construction material remains in the dyke, but the water can drain away.

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