The Journal of Explosives Engineering - January/February 2015 - 10
Figure 3. Sheet pile cofferdams surrounding two piers.
partment of Environmental Quality. These are just some of the
agencies that were concerned with how pier removal at the
new bridge project would be managed.
Partly in response to these concerns, the highway department had developed special construction provisions that specifically dealt with concrete pier demolition in river channels.
The new rules outlined the normal requirements and conditions that were in place when explosives were required on any
highway construction project in Montana. In addition, they
included a debris containment and removal provision that
called for the contractor, to among other things, "conduct a
systematic visual examination of the river bed; (underwater
camera, high resolution sonar, divers, etc.) to insure removal
of all materials greater than 6 inches" (152 mm). The successful contractor and the drilling and blasting crew needed plans
to be developed to insure that nothing, not even small pieces,
escaped containment. If it could be shown that every bit of debris was kept inside of the cofferdam following the shot, then
the expensive river bottom inspection would not be required.
During the preliminary work prior to closing the bridge, the
contractor constructed a work bridge parallel to the existing
bridge. When traffic on the old bridge was finally detoured,
the first order of work was to drill the necessary blastholes
down into the old piers. The very best way to accomplish this
chore was to utilize access to the bridge deck before its removal. Multiple holes were opened in the deck above each pier
to allow the rock drill access to the top of the concrete. The
drill was positioned on the deck of the bridge and six, 3 inch
(76 mm) diameter holes were drilled in a single row along the
center line of each pier. The holes were equally spaced about
3 ft (1 m) apart. When drilling was completed, the holes were
plugged and the drill was taken to the next job. This pattern
was designed to insure that no part of the pier would be more
than 3 ft (1 m) away from the explosives energy in the drill
holes.
When the drilling was completed, the deck of the old
bridge was cut into segments and was removed with cranes
10
Figure 4. Sketch of the best distribution of explosives charges.
The Journal of Explosives Engineering
January/February 2015
The Journal of Explosives Engineering - January/February 2015
Table of Contents for the Digital Edition of The Journal of Explosives Engineering - January/February 2015
From the Executive Director
Concrete Bridge Pier Removal in an Environmentally Sensitive River
Industry News
Chapter News
Calendar of Events
Explosives, 100 Years Ago, More or Less
The Recovery of a Dozer from a Highwall Using Blasting
Safety Talk
21st Annual Photo Contest
The Journal of Explosives Engineering - January/February 2015 - cover1
The Journal of Explosives Engineering - January/February 2015 - cover2
The Journal of Explosives Engineering - January/February 2015 - 1
The Journal of Explosives Engineering - January/February 2015 - 2
The Journal of Explosives Engineering - January/February 2015 - 3
The Journal of Explosives Engineering - January/February 2015 - From the Executive Director
The Journal of Explosives Engineering - January/February 2015 - 5
The Journal of Explosives Engineering - January/February 2015 - 6
The Journal of Explosives Engineering - January/February 2015 - 7
The Journal of Explosives Engineering - January/February 2015 - Concrete Bridge Pier Removal in an Environmentally Sensitive River
The Journal of Explosives Engineering - January/February 2015 - 9
The Journal of Explosives Engineering - January/February 2015 - 10
The Journal of Explosives Engineering - January/February 2015 - 11
The Journal of Explosives Engineering - January/February 2015 - 12
The Journal of Explosives Engineering - January/February 2015 - 13
The Journal of Explosives Engineering - January/February 2015 - 14
The Journal of Explosives Engineering - January/February 2015 - 15
The Journal of Explosives Engineering - January/February 2015 - 16
The Journal of Explosives Engineering - January/February 2015 - 17
The Journal of Explosives Engineering - January/February 2015 - Industry News
The Journal of Explosives Engineering - January/February 2015 - 19
The Journal of Explosives Engineering - January/February 2015 - 20
The Journal of Explosives Engineering - January/February 2015 - 21
The Journal of Explosives Engineering - January/February 2015 - Chapter News
The Journal of Explosives Engineering - January/February 2015 - 23
The Journal of Explosives Engineering - January/February 2015 - Calendar of Events
The Journal of Explosives Engineering - January/February 2015 - 25
The Journal of Explosives Engineering - January/February 2015 - Explosives, 100 Years Ago, More or Less
The Journal of Explosives Engineering - January/February 2015 - 27
The Journal of Explosives Engineering - January/February 2015 - 28
The Journal of Explosives Engineering - January/February 2015 - 29
The Journal of Explosives Engineering - January/February 2015 - The Recovery of a Dozer from a Highwall Using Blasting
The Journal of Explosives Engineering - January/February 2015 - 31
The Journal of Explosives Engineering - January/February 2015 - 32
The Journal of Explosives Engineering - January/February 2015 - 33
The Journal of Explosives Engineering - January/February 2015 - 34
The Journal of Explosives Engineering - January/February 2015 - 35
The Journal of Explosives Engineering - January/February 2015 - 36
The Journal of Explosives Engineering - January/February 2015 - 37
The Journal of Explosives Engineering - January/February 2015 - Safety Talk
The Journal of Explosives Engineering - January/February 2015 - 39
The Journal of Explosives Engineering - January/February 2015 - 40
The Journal of Explosives Engineering - January/February 2015 - 41
The Journal of Explosives Engineering - January/February 2015 - 42
The Journal of Explosives Engineering - January/February 2015 - 43
The Journal of Explosives Engineering - January/February 2015 - 21st Annual Photo Contest
The Journal of Explosives Engineering - January/February 2015 - 45
The Journal of Explosives Engineering - January/February 2015 - 46
The Journal of Explosives Engineering - January/February 2015 - 47
The Journal of Explosives Engineering - January/February 2015 - 48
The Journal of Explosives Engineering - January/February 2015 - cover3
The Journal of Explosives Engineering - January/February 2015 - cover4
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