High-frequency hydraulic vibratory hammer for China Railway R&D project
China Railway Engineering Machinery Research and Design Institute, part of China Railway Engineering Corporation, has independently developed and successfully launched the "high-frequency hydraulic vibratory hammer," which has passed expert evaluation. The expert panel stated that this machine is an efficient pile-driving device widely used in various projects, effectively reducing or eliminating post-construction settlement. As the most advanced pile-driving technology currently available, the high-frequency hydraulic vibratory hammer is suitable for construction in a wide range of geological conditions—provided it does not encounter rock formations.
Compared to other pile-driving methods, this system offers the most cost-effective use of pile materials while meeting railway subgrade requirements for bearing capacity and settlement control. It also enhances construction speed and reduces overall project costs, making it an ideal choice for large-scale infrastructure projects.
For several years, the institute has led the development of the first high-frequency hydraulic vibratory hammer in China. This equipment operates at a high frequency, making it particularly suitable for sandy soils with hardening properties. Its low vibration sensitivity during operation makes it more environmentally friendly and less disruptive to surrounding areas.
The hammer features a double "Y"-shaped steel structure connected to its base, equipped with circular holes that allow for high-frequency operation. A flexible probe is used to reach the desired depth, and the vibrating hammer frequency (typically 10–20Hz) can be adjusted to match the resonance 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, with treatment depths reaching up to 25 meters. The compacted layers are uniformly dense on both the upper and lower sides.
With a recommended power of around 500KW, the high-frequency hydraulic vibratory hammer provides excellent ergonomics and strong driving capacity. It can handle large-diameter piles (with an outer diameter greater than 1.5 meters), meeting the demands of complex engineering projects. As the most efficient pile-driving machine available today, it represents a significant advancement in modern construction technology.
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