Experimental data and experience in industrial application revealed the high efficiency of the two-impact mode in driving various elements into the ground, which is due to the possibility of driving with different vibration parameters (including at high frequencies) without the danger of perturbing the operating stability of the impact-vibration mechanism. The calculation scheme of driving … Continue reading Driving Under the Action of Alternating Impact Loads
Experience on the use of vibrating hammers with a longitudinal action revealed their high efficiency in the sinking of the various elements. In addition, during the operation of these hammers it turned out that they are short-lived and relatively energy-consuming. These two shortcomings are due primarily to the high impact velocities of the vibrating hammers … Continue reading Sinking of Tubular Elements Under the Action of Longitudinal Impacts and Rotational Oscillations
Just as in the study of the vibration sinking process, we limit the steady periodic movement of the impact portion of the vibrating hammer to a period equal to the time of one revolution of the eccentrics. Besides the assumptions in Section 5, we introduce the following also: the impact between the vibrating hammer* and … Continue reading Immersion and Extraction Under the Action of Longitudinal Blows
The annular cross-section of hollow cylindrical elements reveals the possibility of using longitudinal and rotational oscillations when sinking these elements into the ground. Early experience showed that, in order to achieve breakthrough into the adjacent ground with pipes 146 and 273 mm in diameter, the amplitudes required if rotational oscillation is used were an average … Continue reading Immersion and Extraction by Longitudinal-Rotational Oscillations
As we treat the process of sinking and extraction by means of longitudinal vibrations, we shall restrict the stable periodic movement of the vibrating system to a period equal to one revolution of the eccentrics. Note: the following model was reconstructed, and is presented in the paper Reconstructing a Soviet-Era Plastic Model to Predict Vibratory … Continue reading Immersion and Extraction by Longitudinal Oscillations
L.V. Erofeev, VNIIstoirdormashD.C. Warrington, Vulcan Iron Works Note: This article originally appeared in the Second May Issue, 1995 of Pile Buck. Mr. Erofeev retired from VNIIstroidormash after this article appeared and passed away in 2002-3. My memorial for him is here. Dr. Warrington is the webmaster for this site and does consulting work. This article … Continue reading Russian Impact-Vibration Pile Driving Equipment
1 Overview The development of impact-vibration equipment is both an outgrowth of and parallel to the industrial application of the vibration method for driving various objects into the soil, which began in the USSR in 1940. This served as the beginning of comprehensive studies on their exploitation indices and the investigation of the basic parameters … Continue reading Russian Impact-Vibration Pile Driving Equipment: Chapter 3, Research and Development of Impact-Vibration Hammers, and Appendices
CHAPTER IITHEORY OF OPERATION Compared to many machines, impact-vibration hammers are not especially complex; however, because of their interaction with the pile, their mechanics rival those of the diesel hammers in complexity. Thus, impact-vibration hammers are more complex to design, and attention to all theoretical details must be made even before the practical problems are … Continue reading Russian Impact-Vibration Pile Driving Equipment: Chapter 2, Theory of Operation
CHAPTER I INTRODUCTION 1 Basic Description The term "impact-vibration hammer" refers to a type of vibratory pile driver that imparts both vibrations and impacts to the pile during operation. Such a machine is shown in Figure 1. Figure 2 shows a diagram of the internal construction of an impact-vibration hammer. At the centre of the … Continue reading Russian Impact-Vibration Pile Driving Equipment: Chapter 1, Introduction
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