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Devising
A Plan
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With
an environmentally sensitive cove 500 feet to
the south, active reservoirs 300 feet west, new
administrative offices 250 feet north, and the
existing power station just 50 feet east, there
was literally no room to 'lay the stack out' without
endangering or destroying one of these exposures.
And unlike tall steel radio towers- which remain
tethered to the ground via guy-wires during their
fall- there was no way to safely 'guide' the structure
down once the initial blast occurred. Even the
smallest miscalculation would almost certainly
result in severe consequences to the surrounding
area.
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| After
much brainstorming and consultation with independent engineers,
Controlled Demolition Group decided on a revolutionary,
yet totally unproven plan: They would blast the stack
on two delays, and at two elevations. |
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First,
a wedge blasted at the 350-foot elevation would
start the top half of the stack moving towards
the north. As it's center of gravity moved off-line,
the base of this top section would 'kick back'
(as all rigidly-reinforced structures are prone
to do) and slide almost straight down, with the
high end continuing in a slightly northerly direction.
This would be followed quickly by a second, more
powerful blast at the base of the stack on the
opposite southerly side, which would cause the
bottom half to 'sit down' and slowly pitch to
the south. If all went as planned, the debris
pile would be confined to the small open area
between the stack's base and the cove.
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blast team knew that the success of their plan hinged
on three things: The precise timing of the delays,
an exact calculation of each section's load ratios,
and a well-planned and executed drill pattern. If
the top half were to begin it's descent even slightly
off line, the high end could easily impact the adjacent
power station or reservoir. In addition, if the
bottom half failed to gain enough southerly momentum
to counteract the top sliding down, it could 'squat',
which would leave Brown & Mason with an unstable
300-foot tall safety hazard. The demolition team
was well aware that although rare, both scenarios
had been known to occur on various projects throughout
the industry's history. |
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-
The Land of Horizontal Rain -
High winds and rain coming off the Irish
Sea are so consistent, the stack spent
almost its entire existence half-wet and
half-dry
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Apartment
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