## Vibratory Pile Driving: Using Both Longitudinal and Rotational Vibrations Isn’t New

I found the recent paper by Metrikine et.al. (most of the authors are from Delft University) entitled "GDP: A New Technology for Gentle Driving of (Mono)Piles" interesting about combining longitudinal and rotational vibrations to install piling in a "gentler" manner. But is this new? Not really, as can be seen in this excerpt from Immersion … Continue reading Vibratory Pile Driving: Using Both Longitudinal and Rotational Vibrations Isn’t New

## Mounting Pile Hammer Leaders on a Forklift

The development of excavator mast technology has broadened the application of pile driving equipment. Below is another way of mounting pile driving equipment, in this case using a heavy duty forklift. https://youtube.com/shorts/BnbMkty7ZBc?feature=share MKT 10B3 operating on a Manitou MHT 10210 forklift with leaders, headblock and fork mounts put together by Vulcan Foundation Equipment, Ft. Payne, … Continue reading Mounting Pile Hammer Leaders on a Forklift

## Comparing Rigid Piles with Semi-Infinite Piles/Wave Equation Piles

In our last post A Tale of Two Coefficients of Restitution we discussed the development of equations of motion for impacting rams and piles that included a spring between them. This spring is bilinear using the coefficient of restitution. We showed that the behaviour of the ram and pile is the same with the spring in … Continue reading Comparing Rigid Piles with Semi-Infinite Piles/Wave Equation Piles

## A Tale of Two Coefficients of Restitution

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

## Two Papers on Vibratory and Impact-Vibration Hammers

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

## 1839: A U.S. Patent is Granted for a Groundbreaking Machine for Major Transportation Projects — Transportation History

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

## Vibratory Drivers, Impact-Vibration Hammers and Apartment Buildings

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

## 1893: A Newly Built Railroad Bridge in Missouri Passes a Crucial Test — Transportation History

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

## About that “Warrington Method” For Vibratory Pile Drivability

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

## A Laboratory Manual For Trainees In Heat Treatment – Zuyev — Mir Books

In this post, we will see the book A Laboratory Manual For Trainees In Heat Treatment by V. M. Zuyev. 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 Revised […] … Continue reading A Laboratory Manual For Trainees In Heat Treatment – Zuyev — Mir Books