SDDC pile belongs to "DDC method (deep dynamic compaction in hole)", which is a proprietary patented technology product of Beijing Ruilitong Foundation Engineering Co., Ltd. and a deep foundation treatment method. Firstly, the SDDC pile is drilled to a predetermined depth, and then layered filling treatment or filling treatment is carried out from bottom to top to form a dense pile body with high bearing capacity and strong soil squeezing between piles.
Brief introduction of SDDC pile
SDDC pile is a patented foundation treatment technology. First, a hole is punched in the foundation, then it is driven into the hole with a heavy hammer, and treated while adding materials or layered fillers. Finally, a dense pile with high bearing capacity and strong soil compaction between piles is formed.
SDDC heap mechanism
On the basis of comprehensive foundation treatment technologies such as heavy hammer compaction, dynamic compaction, bored pile, reinforced concrete precast pile, lime-soil pile, gravel pile and double lime pile, SDDC pile absorbs its advantages and abandons its disadvantages, and integrates the functions of high kinetic energy, high pressure and dynamic compaction to complete the treatment of soft soil layer.
SDDC piles are drilled (drilled or punched) by machines and tools, then filled into the deep part of foundation treatment through holes, and rammed under high pressure by special gravity rammer with high kinetic energy, so as to achieve the purpose of strengthening the foundation and significantly improve the bearing capacity of the foundation.
Characteristics of SDDC pile
(1) The cost is low, and SDDC piles can choose a wide range of pile body fillers, and local materials can be used to select local pile body materials that can meet the design requirements to ensure the engineering quality;
(2) Good quality. There are a large number of engineering examples of SDDC piles, which meet the design requirements through observation.
(3) The requirements for applicable geological conditions are low, and it can handle various difficult foundations such as special rock and soil, special foundation of garbage dump, etc. in addition to general rock and soil;
④ It has high kinetic energy, overpressure and strong compaction, and the pile diameter changes with the soft and hard changes of natural foundation soil. The softer the soil layer, the larger the pile diameter, the higher the bearing capacity of the treated composite foundation and the smaller the compression deformation.
⑤ The treatment depth is deep, which can reach more than 30m;
⑥SDDC pile construction adopts patented construction technology, and foundation treatment construction is not afraid of water;
⑦ Fast construction period, fully mechanized construction, high production efficiency and little influence by seasons;
⑧ Environmental protection, less construction pollution.
Application of SDDC pile
At the initial stage of technical application, the technology "was applied to dozens of foundation treatment projects, especially in loess areas such as Shaanxi and Henan, and important projects such as cooling towers, main workshops, chimneys, high-rise houses and large oil tanks of large power plants, which eliminated the collapsibility of deep loess foundations, greatly improved the foundation bearing capacity and reduced the foundation compressibility and foundation treatment effect."
Because SDDC piles can form "dynamic compaction soil between piles", SDDC piles are not only suitable for dealing with collapsible loess foundation, but also suitable for dealing with thick backfill foundation and garbage (construction waste, domestic waste, etc.) backfill foundation. ). At the same time, in the process of foundation treatment of landfill, "SDDC piles directly treat the construction waste backfilled in the original foundation, which reduces the excavation and treatment of construction waste and reduces the project cost."
SDDC piles have completed hundreds of projects all over the country, dealing with all kinds of special rock and soil, including soft soil, filled soil, collapsible soil, frozen soil, expansive soil, saline soil and red clay, as well as the foundations of underground civil air defense fortifications, ancient tombs, caves and other complex and difficult adverse geological conditions, involving national defense and aerospace, electric power and water conservancy, petrochemical industry, non-ferrous metallurgy, machinery and building materials, environmental protection and transportation, food and light industry, construction and real estate, etc.