What does DDC pile mean?

That is, deep dynamic compaction in a hole and deep dynamic compaction in a hole (DDC), a patented new technology for foundation treatment (patent number ZL921KLOC-0/4452.0), is to first form a hole in the foundation, drive a dynamic compaction hammer into the hole, and then perform dynamic compaction while feeding or layering fillers. The difference between DDC technology and other technologies is that it introduces dynamic compaction into deep foundation through tunnel, and uses special-shaped heavy hammer to layer the filler in the hole from bottom to top for deep dynamic compaction with high kinetic energy, overpressure and strong compaction, so that the filler in the hole can be consolidated vertically and the soil around the pile can be consolidated horizontally. According to different soil conditions, different technologies are adopted to make the pile body in the shape of beads, enlarged heads and trays. High deformation modulus, small settlement deformation, not affected by groundwater. The depth of foundation treatment can reach more than 30 meters. Deep dynamic compaction (DDC) in holes has a wide range of applications, which can be used to treat thick miscellaneous fill, collapsible loess, soft soil, liquefied soil, weathered rock, expansive soil and red clay, as well as various complex and difficult foundations such as underground civil air defense fortifications, ancient tombs, karst soil caves and uneven hardness of hard interlayer. According to different geological conditions and design requirements, this technology can use local materials, such as building ballast soil, industrial non-toxic waste, plain soil, sand, gravel, sand pebbles, fly ash, stone-mixed soil, lime soil, concrete and so on. , making all kinds of DDC piles. Greatly reduce the engineering cost, the construction quality is easy to control, the ground vibration is small, the construction noise is low and the construction speed is fast; The diameter of pile is 0.6~3.0m, and the treatment area of single pile is 1.0 ~ 14.0m2, which is not limited by seasons and can absorb a large amount of construction waste at the same time, and can be used for the construction of urban areas or residential areas where dangerous buildings are rebuilt. The patented new technology for foundation treatment in deep dynamic compaction (DDC) hole not only has a wide range of materials, but more importantly, it breaks through the traditional concept that has been followed for many years in the field of foundation, and uses construction waste (ballast soil: broken bricks, broken tiles, sand, stone, soil, industrial non-toxic waste and their mixtures, etc.) to treat foundation, turning waste into treasure, without reinforced concrete, saving engineering investment, reducing pollution, protecting the environment and forming.