ABSTRACT
The new highway M-410 in Madrid was constructed in the year 2007. This motorway near to Parla city crosses the road from Madrid to Toledo. To solve this crossing it were constructed three bridges with deep foundations. On the two lateral bridges, called PS-18 and PS-19, after constructing the piles and the deck-slab resting on the soil, it was necessary to remove the earth under the concrete slab to make two lateral roads, but before this, it was made sonic transparency essays in each pile and two boreholes which showed that the earth at the level of the bottom of the piles, was sandy and with a great water flow, so it was was impossible to retire the earth under the concrete deck-slab, because the piles were not correctly founded. To solution of this pathology was the construction of two sheets of deep micropiles at each abutment of the bridges.
