Hydraulic Vibratory Hammer: the Foster 4200

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

Soviet S-834 Impact-Vibration Hammer: Calculations, Part II

The introduction to this series is here.  The first installment of the calculations is here. Calculations of Main Details (Strength Calculations) Strength calculations assume that the inertial forces during impact are 150 times those of the weight. Rotor Shaft We checked the rotor shaft strength in the optimal mode, i.e., when the impacting force direction … Continue reading Soviet S-834 Impact-Vibration Hammer: Calculations, Part II

Soviet S-834 Impact-Vibration Hammer: Calculations, Part I

The introduction to this series is here. Moscow, 1963 Head of the Vibrating Machine Department L. Petrunkin Head of Vibration Machine Construction: I. Friedman Compiler: V. Morgailo and Krakinovskii Specification The impact-vibration hammer is intended for driving heavy sheet piles up to 30 cm in diameter as well as concrete piles 25 cm square up … Continue reading Soviet S-834 Impact-Vibration Hammer: Calculations, Part I

Soviet S-834 Impact-Vibration Hammer: Overview

With this we begin a series of posts on the S-834 impact-vibration hammer, which the VNIIstroidormash institute in Moscow designed and produced in the early 1960's.  With the revived interest in Soviet and Russian technology, it's a detailed look at how Soviet equipment designers came up with an equipment configuration.  But it's also a close-up … Continue reading Soviet S-834 Impact-Vibration Hammer: Overview

Reciprocating Vibratory and Impact-Vibration Hammers

Virtually all vibratory pile drivers use rotating weights to produce the alternating force that mobilises and fluidises the soil. But it's necessary to use the weights in pairs to cancel out the horizontal forces that result. What if the force could be produced using a reciprocating weight, thus eliminating the horizontal cancellation requirement? In the … Continue reading Reciprocating Vibratory and Impact-Vibration Hammers

Vulcan Vibratory Hammers and Vibratory Technology

By World War II, Vulcan's air/steam hammer line dominated its production and revenue stream. Of all of the attempts Vulcan made to diversify is pile hammer line after that time, probably the most successful was its line of vibratory pile hammers. Vibratory pile driving equipment represented a major departure for Vulcan, but it also represents … Continue reading Vulcan Vibratory Hammers and Vibratory Technology

Vulcan High-Frequency Vibratory Hammers

The mid-1980's were lean years at Vulcan. The offshore market was still down, the aftermath of the collapse of oil prices earlier in the decade. Vulcan's own diesel program had to be stopped, plagued by design and manufacturing problems and an overvalued US Dollar. The vibratory hammer program was going reasonably well but the market … Continue reading Vulcan High-Frequency Vibratory Hammers

Vulcan’s Medium Frequency Vibratory Hammers

In 1984 Vulcan re-entered the vibratory hammer market with the introduction of the 1150 vibratory hammer. This hammer made its debut on a project in Bangor, Maine for Cianbro Construction. More suited for the American market and adequately powered, these machines were far more successful than the Vulcor hammers had been. The technology used was … Continue reading Vulcan’s Medium Frequency Vibratory Hammers

Uraga/Vulcor Vibratory Hammer

Vulcan's first venture into the vibratory market took place in the 1960's with the introduction of the Uraga electric vibratory hammer from Japan, which Vulcan marketed as the Vulcor Vibratory Hammer. Vibratory pile driving technology had been developed in the Soviet Union. One of the first countries to pick up the technology was Japan. With … Continue reading Uraga/Vulcor Vibratory Hammer

Vertical Drains: Sand and Wick

One of the more interesting applications of vibratory hammers is the installation of wick drains, a type of vertical drain. But vertical drains are of interest far beyond vibratory technology. Overview Soils are a composite of solid soil particles, water and air. When soils reside below the water table (phreatic surface,) there is no air, … Continue reading Vertical Drains: Sand and Wick