ENGLISH site map Partners Net Contact Us HOME Technology / construction method Ground improvement composite pile method Technology / construction method Concrete / structures, earthquake countermeasures, renewal, ground improvement Ground improvement composite pile method Related keywords Concrete / structure Earthquake countermeasures renewal Ground improvement Overview It is a construction method that enhances seismic performance by integrating the upper part of the pile foundation with ground improvement, and since the number of piles and the pile diameter can be reduced compared to the case of only the pile foundation, it is possible to reduce costs by 10% or more. It becomes. It is also effective as a seismic reinforcement of pile foundation structures by using the injection stirring method for ground improvement. In recent years, underground structures have been required to be designed to have sufficient yield strength and deformation performance even in the event of a large earthquake that occurs extremely rarely. On the other hand, with regard to social capital development, there is a strong demand for reduction of costs and environmental load associated with construction projects. By combining with a pile foundation like this foundation type, it contributes to the reduction of construction cost. Features Improved seismic resistance It has a large horizontal bearing capacity and excellent seismic performance. Confirmation of horizontal bearing capacity by loading test Confirmed double horizontal bearing capacity of piles only Comparison of horizontal bearing capacity function Horizontal bearing capacity is improved by the peripheral surface resistance and front surface resistance of the improved ground. Reduction of environmental load It is possible to reduce the burden on the environment with a small amount of industrial waste soil. Cost reduction Compared to the conventional method, it is more economical as shown in the table below. Cast-in-place pile (Benot pile) Ground improvement composite pile (DCM + Benot pile) Ground overview Number of stakes 9 6 Total pile extension 198m 132m Ground improvement 0 354m³ Cost ratio 100% 85% Application example Effect of utilization In examining this foundation type, we conducted a load test of ground improvement composite piles in the Misato test work of the Japan Highway Public Corporation, and confirmed that the foundation is excellent in both horizontal and vertical directions. We believe that this foundation type will greatly contribute to ensuring the safety of structures, reducing costs, and reducing environmental impact. 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