Most engineers are familiar from their dynamics course (assuming, of course, it was required) with the coefficient of restitution during the impact of two bodies. Then, if they're introduced to pile dynamics, they're told that certain parts of the pile-hammer-soil system have a coefficient of restitution of their own. Most of the time they're solemnly … Continue reading A Tale of Two Coefficients of Restitution
We present two papers on these topics, one first presented last year and one which has just been completed. Inclusion of Rotational Inertial Effects in Power Consumption Calculations for Vibratory Pile Equipment Abstract: Virtually all treatments of power consumption and modelled performance for vibratory pile driving equipment assume a constant rotational speed of the eccentrics. … Continue reading Two Papers on Vibratory and Impact-Vibration Hammers
February 24, 1839 Civil engineer William Smith Otis of Philadelphia was issued U.S. patent number 1,089 for the steam shovel, which was classified in that patent as a “Crane-Excavator for Excavating and Removing Earth.” As designed by Otis, this large steam-powered machine — when mounted on wheeled devices such as carriages or railroad cars — […] … Continue reading 1839: A U.S. Patent is Granted for a Groundbreaking Machine for Major Transportation Projects — Transportation History
In Vulcan's last years, its relationship with Soviet (and after that Russian) people and institutions enabled it to obtain some interesting information about their vibratory and impact-vibration hammers. Some of this can be found at our post Material on Vibratory and Impact-Vibration Equipment from the Soviet Union and Russia. Part of that was a collection of … Continue reading Vibratory Drivers, Impact-Vibration Hammers and Apartment Buildings
December 27, 1893 A pivotal test ride took place for a newly completed truss railroad bridge in eastern-central Missouri. This four-span truss bridge, crossing the Missouri River at Bellefontaine Bluffs and serving as a link between Charles County and St. Louis County in the Show-Me State, had been built for the Chicago, Burlington, and Quincy […] … Continue reading 1893: A Newly Built Railroad Bridge in Missouri Passes a Crucial Test — Transportation History
Every now and then something comes up that you really didn't expect. That took place with a paper published this year cited "W.J. Lu, B. Li, J.F. Hou, X.W. Xu, H.F. Zou, L.M. Zhang, "Drivability of large diameter steel cylinders during hammer-group vibratory installation for the hong kong–zhuhai–macao bridge," Engineering (2022), doi: https://doi.org/10.1016/j.eng.2021.07.028." (You can … Continue reading About that “Warrington Method” For Vibratory Pile Drivability
To Download the Book Click Here About the book A lab manual with a series of experiments for determining effect of various types of processes on properties of materials. Translated from the Russian by Boris V. Kuznetsov. First published 1985. Heat treatment was an important part of the manufacture of Vulcan hammers, both castings and … Continue reading A Laboratory Manual For Trainees In Heat Treatment – Zuyev
It's that time of the year. Whether you follow a formal liturgical calendar or don't, if the holiday comes and you're celebrating it, you're getting ready for it. In the construction industry, we live from job to job, and we not only have to prepare for the job to start, but for it to finish … Continue reading Loading Out: A Christmas Reflection
The Alemite ad above illustrates the importance of proper lubrication. Vulcan used and specified Alemite grease fittings in products such as the Hydra-Nut and others to help their customers do lubrication and other important maintenance items on their Vulcan equipment. The "outside" of the Hydra-Nut (U.S. Patent 3,938,427.) Introduced in the 1970's to directly replace … Continue reading Alemite and Vulcan Try to Get People to Lubricate Their Equipment
It's happened again: the paper "Vibratory and Impact-Vibration Pile Driving Equipment" has been cited by Mohammed Al-Amrani and M Ikhsan Setiawan in their paper "Prefabricated and Prestressed Bio-Concrete Piles: Case Study in North Jakarta." The abstract of their paper is here: In this research, we will talk about Prefabricated and Prestressed Concrete piles in general and … Continue reading The Paper “Vibratory and Impact-Vibration Pile Driving Equipment” Cited
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