This is a brief summary of the basic theory behind vibratory power. It goes back to Savinov and Luskin (the original summary of the development of the technology) and I've covered it repeatedly in my monographs. The basic model is shown above. It assumes that that soil acts as a velocity-dependent damper, which speaks to … Continue reading The Basics of Vibratory Power Theory
The 1400, driving sheeting for a creosote plant environmental remediation in Chattanooga. The 1400 incorporated many of the features of the 400, including the curved eccentric case (which was mated to the 7" clamp.) The original suspension was an H-beam, but this proved too light for bias weight, and was replaced by the cast unit … Continue reading Estimating the Starting Time of a Vulcan Vibratory Hammer
Recently the paper "Prefabricated and Prestressed Bio-Concrete Piles: Case Study in North Jakarta" cited my work Vibratory and Impact-Vibration Pile Driving Equipment. I always like to pass along works which cite mine (and are openly available like this one.) When I wrote my own article in 1989 and revised it three years later, I had … Continue reading Comments on “Prefabricated and Prestressed Bio-Concrete Piles: Case Study in North Jakarta”
The basic mechanics of vibratory pile drivers, i.e., those which drive with vibration and without impact, are well documented. This is a more detailed look at their kinematics (and some of their kinetics) which will show, at the least, that these aren't just pulled out of the air but have some basis in the dynamics … Continue reading The Kinematics and Kinetics of Vibratory Driver Eccentric Rotation
In my earlier post Checking the Soviets: Determining the Bending of the Shaft, I went into the analysis of the centre shaft of the machine. For my Statics course at Lee University, I want to go through a "hand" analysis of this. The machine is shown above. A simpler drawing of the shaft itself is shown … Continue reading “Hand” Solution for the Centre Shaft for the S-834 Impact-Vibration Hammer
In the post Checking the Soviets: Determining the Eccentric Moment, we discussed the process of determining this parameter and more for a vibratory eccentric. The importance of the pendulum frequency--and the way that rotational moment of inertia and mass moment of inertia can easily be related with this kind of configuration--was discussed in Two Papers on … Continue reading Determining the Eccentric Moment, Rotational Inertia and Pendulum Frequency for a Vibratory Eccentric
I spent a lot of time posting Vibro-Engineering and the Technology of Piling and Boring Work and The Vibration Method of Driving Piles and Its Use in Construction. It's worth wondering if machines like these (like the one shown above) are still made and used. Wonder no more: the following YouTube video answers that question as an … Continue reading Watching a Soviet Style Electric Vibratory Driver in Action
This paper is scheduled to be presented today at the Spring Research and Arts Conference at the University of Tennessee at Chattanooga. The presentation slides for this paper (with its abstract) can be found here. The paper itself is here.
One of the mysteries of geotechnical engineering relative to driven piles is why the Soviets, with their mathematical prowess, never applied wave mechanics to predict the performance of pile driving systems using the wave equation. In a sense this book, which is a classic in the geotechnical literature, answers that, but not in a direct … Continue reading Some Lessons from “Savinov and Luskin”
For the rest of the book, click here. I debated whether to translate the reference section. I ended up deciding not to do so. Most all of the material referenced in this book is in Russian and my guess is that most of it has never been translated into another language. So what I have … Continue reading References
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