Increasing the bearing capacity of the soil of the base by petrification by the introduction of chemicals. The demonstration work of this order was carried out in Koenigsberg over the building of the main Vokal due to an increase in the load on the foundation.
The reinforced concrete building (454) of the frame system had tape foundations with a width of 1.50, 2.00 and 2.50 m wide. By pumping chemicals into the soil under the foundations, a petition of the soil was achieved at the base of the width of 2.50 – 4.80 m, and the formed massifs of petrified soil were pillows under the old foundations of the tape type.
This kind of work usually begins with drilling wells of a diameter of 50 – 75 mm on both sides of the foundation at a distance of 0.5 – 2.0 m from another. These distances and the necessary atmospheric pressure when heated chemicals are determined each time experimentally. In cases where the depth of the well in is limited to 2.0 – 3.0 m, drilling is carried out every 0.5 m and the solution is pumped with a pressure not exceeding 3 – 5 AM. With the indicated method of expanding the area – the base and increasing its resistance, no auxiliary, temporary supports to maintain the foundation are required. Incommunication should occur simultaneously on the two sides of the foundation, because with one -sided injection the formed heterogeneity of the soil to the side. the foundation can cause the roll of the building towards the weaker soil.
Currently, soil petrification is mainly used in bulk (sand) soils,
However, nowadheless attempts to apply petrification of viscous (clay) soils are already being made now.
As an example of the strengthening of the structure, which has undergone uneven siege of individual foundations, it is possible to give work in Florida to strengthen a high building based on a softening rock. This building received three Dina e de during the construction period, and the foundations of this building with a large area of the sole gave a significantly greater sediment than foundations with smaller sizes of the sole.