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Any object or device has its own natural frequency. When the vibration frequency of the vibrating pile hammer is close to or equal to the natural frequency of the vibrating pile hammer, pile and other vibration systems, it will cause strong vibration of the vibrating pile hammer, pile and other vibration systems, which is called "resonance". When resonance occurs, the amplitude of vibration often reaches more than 10 times the normal amplitude.
In recent years, with the strong promotion of super large infrastructure projects (such as airports, docks, and land reclamation) by the country, higher requirements have been put forward for the construction safety, efficiency, energy conservation, and environmental protection of foundation reinforcement and improvement technology. Among them, the vibration sinking stone pile method, especially the large-diameter vibration sinking stone pile method, is an important method for future foundation reinforcement and improvement projects.
In modern urban construction, the development of basic construction technology is crucial for improving engineering efficiency and ensuring construction safety. With the increasing awareness of environmental protection, traditional vibrating pile hammers are limited in urban construction due to their noise and vibration pollution problems.
Cleverly utilizing the variation law of low soil resistance when vibrating the sinking double tube and high soil resistance when statically pulling out the inner tube, the vibrating hammer is equipped with the functions of soil extraction and hole formation.
The vibrating pile hammer is one of the important equipment in pile foundation construction. It generates vibration through the rotation of an eccentric body, which can "liquefy" the soil around the pile, reduce the resistance between the pile and soil, and quickly achieve the purpose of sinking and pulling out the pile. Compared with other pile driving machinery, the vibrating pile hammer has both the functions of sinking and pulling piles, and can be used to produce prefabricated piles and cast-in-place piles.
With the increasing use of PHC concrete prefabricated pipe piles in large-scale engineering foundation construction, especially in soil layers above medium coarse sand, the existing construction methods such as static pressure machine pressing method, hydraulic hammer driving method, drilling machine drilling and implantation method, and Japanese medium excavation method are difficult to construct large-diameter PHC piles, with high cost and low efficiency.
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