High-frequency hydraulic vibratory hammer for China Railway R&D project
China Railway Engineering Machinery Research and Design Institute, affiliated with China Railway Engineering Corporation, has independently developed and successfully launched the "high-frequency hydraulic vibratory hammer," which has passed expert evaluation. The expert panel praised the device as an efficient pile-driving machine that has been widely applied in various projects, effectively reducing or eliminating post-construction settlement. Currently, the high-frequency hydraulic vibratory hammer is considered the most efficient pile-driving equipment available.
This technology is suitable for construction under a wide range of geological conditions, provided it does not encounter rock formations. Compared to other pile-driving methods, it uses the least amount of pile material to achieve the same bearing capacity, making it the most cost-effective solution. It meets all railway subgrade requirements regarding load-bearing capacity and settlement control, while also accelerating construction speed and lowering overall project costs.
For several years, the China Railway Engineering Machinery Research and Design Institute has led the development of the first high-frequency hydraulic vibratory hammer in China. This equipment features a high vibration frequency, making it ideal for use in soils with a high sand content. Its low vibration sensitivity during operation makes it more environmentally friendly and less disruptive to surrounding structures.
The hammer is equipped with a double "Y"-shaped steel structural member at its base, which includes a circular hole to enable high-frequency operation. A flexible probe is then driven to the desired depth, and the vibrating hammer frequency (typically 10–20Hz) is adjusted to match the resonance frequency of the surrounding soil. As soil density increases, so does the resonance frequency. By continuously adjusting the frequency, different levels of compaction can be achieved, ensuring uniform density both above and below the treatment depth—up to 25 meters.
With a power output of approximately 500 kW, the high-frequency hydraulic vibratory hammer offers excellent ergonomics and strong driving capacity. It can handle large-diameter piles (with an outer diameter greater than 1.5 meters), meeting the demanding requirements of modern engineering projects. As the most efficient pile-driving machine on the market, it represents a significant advancement in construction technology.
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