Now that we have established the basic parameters, we need to move on to the spring constant calculations. Here we run into some things that frankly don't make a lot of sense, perhaps the reader can help to resolve the dilemmas. The original calculations are here. Let's start by looking again at the basic impact-vibration … Continue reading Checking the Soviets: The Strange Case of the Spring Constants
In our last post Checking the Soviets: A Tale of Two Cities we described the underlying institutions that designed and built impact-vibration equipment. Henceforth, based on this post we will refer to the two groups as the "Moscow" and "Leningrad" groups, to save the reader having to deal with the Cyrillic alphabet soup that Soviet institutions … Continue reading Checking the Soviets: Finding the Frequency and Establishing Basic Parameters
In our last post Checking the Soviets: Determining the Eccentric Moment, we looked at a specific calculation of the eccentric moment of an impact-vibration hammer. Before we get further into this topic, it would be good to pause and give some background on how the Soviets developed the impact-vibration hammer. Once it got out of its … Continue reading Checking the Soviets: A Tale of Two Cities
This is the first in an aperiodic series on design calculations for a piece of experimental Soviet construction equipment, in this case an S-834 impact-vibration hammer. A more complete history of these machines (a co-author was one of the designers) is here. We're going to compare the calculations originally done on these machines with what … Continue reading Checking the Soviets: Determining the Eccentric Moment
In 1988 Vulcan personnel visited what was then Leningrad to view the operation of a Soviet variable-eccentric moment vibratory hammer. The account of that is here. This is the field service manual for the hammer. A closeup of the exciter and suspension, clamped to the pile. As is common in Europe, the sheets are picked … Continue reading Field Service Manual for Soviet B402/V402 Vibratory Hammer
Axial Response of Three Vibratory and Three Impact Driven H-Piles in Sand Jean-Louis BriaudLarry M. TuckerBriaud Engineers U.S. Army Corps of EngineersMiscellaneous Paper GL-88-28August 1988 A research program to compare the ultimate axial capacity of vibratory and impact driven H-piles in sand was conducted at a San Francisco, CA, site. The effects of time-lapse after … Continue reading Monographs on Vibratory and Impact-Vibration Pile Driving
Improvement of the Capacity of Vibrating Hammers for Driving Pipes Into Soils (article in English) M.G. Tseitlin, VNIIGSOsnovaniya, Fundamenty i Mekhanika Gruntov, No. 3, pp. 6-9, May-June, 1973 It is known that vibrating hammers (impact-vibration hammers) are highly effective for driving pipes. However, their wide use is prevented by their insufficient durability and high energy … Continue reading Material on Vibratory and Impact-Vibration Equipment from the Soviet Union and Russia
Development of a Parameter Selection Method for Vibratory Pile Driver Design with Hammer Suspension This paper details the mathematical modelling of vibratory pile driving systems using a linear model with the objective of obtaining a closed form solution to estimate either the power requirement of the machine, the torque requirement of the motor driving the … Continue reading Articles and Monographs on Vibratory and Impact-Vibration Equipment Written by Vulcan Personnel
The latest in our series of monographs on vibratory pile drivers, this one takes us back to the beginnings of vibratory pile driving in the Soviet Union. It was prepared for the ReSEARCH Dialogues at the University of Tennessee at Chattanooga in April 2021. The vibratory driver that started it all: the Soviet BT-5, used … Continue reading Reconstructing a Soviet-Era Plastic Model to Predict Vibratory Pile Driving Performance
Background The Foster hammers are an interesting part of Vulcan's last years. The concept was to produce a vibratory hammer under a "private label" arrangement, a novelty for the pile driving equipment industry at the time (although the "Chimag" diesel hammers were a similar concept.) In the early 1990's Vulcan produced several vibratory hammers for … Continue reading Hydraulic Vibratory Hammer: the Foster 4200
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