Because the rock is much harder here than it is at the Ralph quarry, we must learn the basics of using small air hammers
driven by compressed air.
PHOTO : Outwater Plastic's hand-held air hammer
can perform single taps to heavy impact blows.
I wore earplugs and earmuffs on top of that, with all the multiple hits from the air hammer
. Without earplugs and headphones and Jody, I couldn't have done the riveting.
Sharewell LP has introduced a new internal shock-absorbing tool that permits the use of an air hammer
with a wireline steering tool for horizontal directional drilling projects.
"For rock, we use an air hammer
and Railhead bit with diamond teeth," said Jack Freeman, division manager of outside plant construction.
The complete down-hole assembly includes: Three ROUGHNECK Bits and Air Hammer
, Control Station/Oiler with integrated electronic controls, sub-connection, TRIHAWK EXTREME universal high flow rock drill housing that utilizes the industry standard API thread making system connection easy.
The DD-4045 also works seamlessly with the Astec Hard Rock System air hammers
. The operator can control the air hammer
functions directly from the onboard color LCD.
Instead of using a standard pilot drill bit, the crew used a Straightline 4-inch air hammer
system to simplify boring through rock and to keep the sewer line on grade, which proved to be the biggest challenge of the project.
The AH4.0 (20 lbs.) and AH5.0 (30 lbs.) Air Hammer
Systems pulverize the hardest rock at a rate of 150 feet per hour.
Installations were made with an Akkerman 308 GBM (guided boring machine) and Halco Storm 500 air hammer
with 5 1/4-inch bit for the pilot hole and specially-designed theodolite guidance system.
Kirk Excavating rented a Vermeer Hammerhead air hammer
with a 5-inch pilot bit to break through the rock formations in a day and a half, using a pressure setting of 350 psi.