Jackhammer

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Jackhammer

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Author : Paul Dale Anderson
language : en
Publisher: Crossroad Press
Release Date : 2017-07-31

Jackhammer written by Paul Dale Anderson and has been published by Crossroad Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-31 with Fiction categories.

Andy Sinnott and Connie Kelly face off with a professional assassin in this taut psychological thriller. Burke—hired by the mob to eliminate Lester Cartwright, Tom Wesley, David Mullins, and a sequestered federal witness—is a brutal killer who uses a jackhammer on his victims. Burke sends Andy to the hospital, captures Connie, and cuts off two of her toes. Helpless and at the mercy of a sadistic serial killer, Connie must think out of the box if she hopes to survive. Fast-paced and riveting, this tale brings together characters from previous books. Who will survive and who won’t?

Jackhammers

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Author : Connor Dayton
language : en
Publisher: The Rosen Publishing Group, Inc
Release Date : 2011-08-15

Jackhammers written by Connor Dayton and has been published by The Rosen Publishing Group, Inc this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-08-15 with Juvenile Nonfiction categories.

Introduces the jackhammer, discussing the parts of the machine and its purpose.

Look A Jackhammer

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Author : Julia Jaske
language : en
Publisher: Cherry Blossom Press
Release Date : 2021

Look A Jackhammer written by Julia Jaske and has been published by Cherry Blossom Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Juvenile Nonfiction categories.

Welcome to the construction site! Look, there's a jackhammer. What does a jackhammer do? Read on to find out! Books in the At the Construction Site series use the Whole Language approach to literacy, a combination of sight words and repetition that builds recognition and confidence. The simple text makes it easy for children to engage in reading. Included are bold, colorful photographs that correlate directly to the text to aid readers through the book.

Design And Testing Of A High Frequency Hydraulic Mechanical Jackhammer

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Author : Stephen McGuire
language : en
Publisher:
Release Date : 2020

Design And Testing Of A High Frequency Hydraulic Mechanical Jackhammer written by Stephen McGuire and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

"Concrete has been used as a building material for thousands of years. The material has continued to evolve in parallel with our growing understanding of internal structural stresses. As one of the primary building materials in urban centres, concrete is routinely poured, repaired, and demolished. Expansive agents, hydraulic splitting, hydraulic demolition and mechanical demolition breakers are common methods of concrete removal, as documented by Abudayyeh, Sawhney et al. in 1998. Mechanical demolition breakers, known as jackhammers, are commonly used within the industry as they provide a versatile platform for the reduction in size of large quantities of material. The first patent for a pneumatic jackhammer was granted to Charles King in 1894. This design depicts a machine with an internal hammer that is pushed back and forth by compressed air. On the downward stroke the hammer contacts a chisel which transfers the impact energy into the concrete, inducing fracture of the material. As early as 1929, Holtzmann began to document the development of degenerative arthritis in workers who used hand held demolition breaker. Despite the machine’s noise, and ergonomic issues, the jackhammer has not seen substantial redesign or development over the past century. In 1969, Benjumea and Sikarskie developed a model of the crushing and chipping process that occurs after the impact of a rigid chisel on a brittle material such as concrete or granite. This model clearly showed a primary crushing and secondary chipping process following the impact of the chisel. Dutta, in 1972, modeled the geometric indentation of the crushing and chipping zones as being dependant on the geometry of the chisel tip and the material being impacted. A more in-depth understanding of the upper and lower limits of the crushing and chipping sequence as well as the effect of repeated impacts was developed by Pang, Goldsmith and Hood in 1989. These models took into consideration the material characteristics, chisel geometry, and force with which the chisel is struck. They made the assumption that the time delay between strikes will have little impact on the indentation geometry. The research in this thesis, developed and tested a high frequency hydraulic mechanical jackhammer capable of reaching impact frequencies of over 80 Hz, more than doubling the impact frequencies of a single hammer. This machine implemented a design using two hammer mechanisms connected to a single tip. Ultimately the design increased the impact frequency by 2.3 times without modifying the chisel tip geometry or striking force. Testing demonstrated that the design was functional and material indentation did occur. Further testing is required following the methods outlined by Pang and Goldsmith in 1990 to determine if the crack propagation at elevated frequencies is in accordance with the indentation models outlined in the literature"--

Jackhammer Sam

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Author : Peter Mandel
language : en
Publisher: Macmillan
Release Date : 2011-11-08

Jackhammer Sam written by Peter Mandel and has been published by Macmillan this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-11-08 with Juvenile Fiction categories.

A jackhammer operator boasts about his loud, sidewalk-blasting skills.