Micropiles are used as foundation piles in order to transfer compressive and tensile loads in the most diverse construction tasks. A frequent use in addition to its function as a foundation pile, is its use as uplift piles for excavation pits and or as anchors for excavation pit and structure walls.
Micropiles are small grouted piles with diameters of less than 30 cm according to DIN EN 14199, that almost exclusively transfer their load into the surrounding soil by means of skin friction. The inner bearing capacity is normally provided by a centrally arranged steel element.
An optimal bonding with the surrounding soul is normally achieved by post-grouting with cement mortar. Depending on the soil and the pile diameter, it is possible to achieve bearing capacities exceeding 1000 kN. Their special benefit is that they can even be created in very confined spaces and that with extremely low noise and vibration levels. These micropiles are often the first choice when foundation or re-foundation work is to be carried out on existing structures (e.g. when carrying out remedial work .
These piles are often the best technical and economical solution when used for smaller projects.
Benefits of micropiles
- installation possible in very confined spaces
- extremely low noise and vibration
- creation with relatively small and light drillingrigs
Information for design and execution
As foundation piles, micropiles can be an economical alternative to bored piles according to DIN EN 1536, as modern micropiles are also able to transfer high loads, it also being possible to gain a time benefit due to the shorter construction times. Micropiles can also be installed from a pontoon to anchor structures with risk of buoyancy.