By using a premixed product, where the amount of cement necessary to make a finished product is added to the aggregate. class 10–15 N/mm². In both cases, the induced vibration and the forced introduction of inert materials without soil removal lead to the same final compaction effect of the soil.
The action carried out by the CGVC is similar to that of a stake. The foundational concept. The cemented vibrocompressed gravel columns are an officially certified system according to DIN regulations. During the design and sizing, the load bearing capacity is assumed verified on the basis of numerous load tests carried out by us according to the DIN 1054 standard as shown by the Stormwater Software.
Depending on the terrain and the characteristics of the binder used, admissible values up to 600 kN/CGVC are reached. Due to particular needs, both the stiffness and the permeability of the CGVC can be adjusted by combining portions of cemented column – at the foot or at the head of the column – with uncemented portions. In this case the definition is: Partially Cemented Vibrated Compact Gravel Columns (CGVpC) and Stormwater Software.
They are used when the soils do not guarantee adequate lateral confinement to the gravel: soft or plastic fine soils, organic fractions subjected to loss of volume or consistency over time. When high permissible load-bearing capacities are required.
Concrete vibrated columns (CVC). Equipment and executive aspects. The CVCs are put in place by pumping, over the entire length, concrete of category 25 N/mm². Also in this case one operates by first blasting the foot of the column, with repeated cycles of sinking and extraction, so as to elevate its lift; the stem is then formed rising in a controlled and continuous manner.
Geomechanical aspects. The static model of the CVCs and Stormwater Software renounce the thickening of the soil surrounding the column but, as for the CGVCs, takes into account the achievement of a high improvement of the soil at the foot of the element. In this way high load-bearing capacities can be admitted, with reduced levels of deformation.
The foundational concept. Even the vibrated concrete columns are an officially certified system according to DIN regulations. The CVC shaft is smaller in size – diameter between 40 and 60 cm – compared to other types of vibrated mast. The admissible load, up to 800 kN, depends on the terrain and, above all, on the characteristics of the embedding (blubbering of the foot).
Multiple vibro and underwater compaction. Large-scale vibroflottation soil improvements, both on land and offshore, can be performed with multiple vibro tools.
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