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Transcript of A03-DEMO
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12B30 / 12C30 / CET - B03 Slide # 1
IDEAL LOCATIONS
Field fortifications
Bridges
Walls
Buildings
Dams
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12B30 / 12C30 / CET - B03 Slide # 2
CRITICAL FACTORS
1. Size of charge
2. Shape of charge
3. Placement and tamping of charge
NOTE: The metal in reinforced concrete
is not cut by breaching charges.
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12B30 / 12C30 / CET - B03 Slide # 3
BLOCK CHARGES
P = R3 KC
Hasty Calculation
METHODS OF CALCULATING
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12B30 / 12C30 / CET - B03 Slide # 4
BREACHING FORMULA
P = Lbs of TNT
R = Breaching radius in feet
K = Material factor
C = Tamping factor
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12B30 / 12C30 / CET - B03 Slide # 5
R R
External Internal
Round up to next1/2 foot
Round up to next1/4 foot
Values of "R"
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12B30 / 12C30 / CET - B03 Slide # 6
VALUES OF "K"
Material Breaching Radius (R) K
Earth All Values 0.07
Poor masonry, Less than 1.5 m (5 ft) 0.32
Shale,
Hardpan, 1.5 m (5 ft) or more 0.29
Good timber,
Earth construction
Good masonry, 0.3 m (1 ft) or less 0.88
Concrete block, Over 0.3 m (1 ft) to less than 0.9 m (3 ft) 0.48
Rock 0.9 m (3 ft) to less than 1.5 m (5 ft) 0.40
1.5 m (5 ft) to less than 2.1 m (7 ft) 0.32
2.1 m (7 ft) or more 0.27
Dense concrete, 0.3 m (1 ft) or less 1.14
First-class masonry Over 0.3 m (1 ft) to less than 0.9 m (3 ft) 0.62
0.9 m (3 ft) to less than 1.5 m (5 ft) 0.52
1.5 m (5 ft) to less than 2.1 m (7 ft) 0.41
2.1 m (7 ft) or more 0.35
Reinforced concrete 0.3 m (1 ft) or less 1.76
First-class masonry Over 0.3 m (1 ft) to less than 0.9 m (3 ft) 0.96
0.9 m (3 ft) to less than 1.5 m (5 ft) 0.80
1.5 m (5 ft) to less than 2.1 m (7 ft) 0.63
2.1 m (7 ft) or more 0.54
Table 3-5. Material factor (K) for breaching charges
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12B30 / 12C30 / CET - B03 Slide # 7
VALUES OF "C"
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12B30 / 12C30 / CET - B03 Slide # 8
NUMBER OF CHARGES
N = W
N = Number of charges
W = Width of target2R = 2 X breaching radius
* Less that 1.25 use 1 charge
* 1.25 to 2.49 use 2 charges
* 2.5 or greater round off tothe nearest whole number
2R
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12B30 / 12C30 / CET - B03 Slide # 9
Table 3-1
Breaching charge thickness*
Charge Weight(pounds)
Chargethickness
(inches)Less than 5 1
5 to less that 40 2
40 to less than 300 4
300 or more 8
NOTE: If using TNT, use approximate thickness
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12B30 / 12C30 / CET - B03 Slide # 10
PROBLEM
Calculate the amount of explosives to rubblethis dense concrete wall. Use TNT andground placed, untamped charges.
10'
6'
40'
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12B30 / 12C30 / CET - B03 Slide # 11
SOLUTIONStep 1. 40'W 6'R dense concrete TNT
Step 2. P=R KC=6x6x6x.41x3.6 = 318.81 lbs TNT
3
Step 3. N/A
Step 4. 318.81 lbs 319 pkgs TNT
Step 5. N = W = 40 = 3.3 3charges
2R 12Step 6. 319 x 3 = 957 pkgs TNT
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12B30 / 12C30 / CET - B03 Slide # 127'
70'
PROBLEMCalculate the amount of explosive required tobreach 4 poor masonrywalls using M1 dynamite
ground placed and untamped.
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12B30 / 12C30 / CET - B03 Slide # 13
SOLUTION
Step 1. 70'W 7'R poor masonary M1ground placed, untamped
Step 2. P=R KC=7x7x7x.29x3.6 = 358.09 lbs TNT
3
Step 3. 358.09 = 389.22 lbs dynamite.92
Step 4. 389.22 = 778.44 779 sticks dynamite.5
Step 5. N = W = 70 = 5 x 4 walls = 20 charges2R 14
Step 6. 779 x 20 = 15580 sticks dynamite
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12B30 / 12C30 / CET - B03 Slide # 14
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12B30 / 12C30 / CET - B03 Slide # 15
Table 3-7. Conversion factors for materialother than reinforced concrete
MaterialConversion
Factor
Earth 0.1
Ordinary masonaryHardpanShaleOrdinary concreteRock
Good timber Earth construction
Dense concreteFirst class masonary
0.5
0.7
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12B30 / 12C30 / CET - B03 Slide # 16
PROBLEM
Calculate the amount of C-4 required torubble a dense concrete falling block
obstacle 4' square and 30' wide.
* Use: Ground placed untampedHasty calculation
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12B30 / 12C30 / CET - B03 Slide # 17
SOLUTION
Step 1. 30'W 4'R dense concrete C-4ground placed untamped, hasty
Step 2. From Table 3-5 111 pkgs x .7from Table 3-6 = 77.7 pkgs C4
Step 3. N/A
Step 4. 77.7 78 pkgs C-4
Step 5. N = W = 30 = 3.75 4charges
2R 8
Step 6. 78 x 4 = 312 pkgs C-4
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12B30 / 12C30 / CET - B03 Slide # 18
PROBLEM
Calculate the amount of C4 requiredto rubble a dense concrete wall5' thick and 60' wide.
* Use: Elevated untamped
Hasty Calculation
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12B30 / 12C30 / CET - B03 Slide # 19
SOLUTION
Step 1. 60'W 5'R dense concrete, C4elevated untamped, hasty
Step 2. From Table 3-5 85 pkgs x .7 fromTable 3-6 = 59.5 pkgs C4
Step 3. N/A
Step 4. 59.5 pkgs 60 pkgs C4
Step 5. N = W = 60 = 6 charges2R 10
Step 6. 60 x 6 = 360 pkgs C4
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12B30 / 12C30 / CET - B03 Slide # 20
COLUMNS
CUBES
Cubes or rectangles:4' or less in thicknessand width (not walls)
COUNTERFORCE CHARGESIZE: 1 lb of C-4 per foot of concrete1/2
PLACEMENT: Charges should be diametrically opposed
DETONATION: Charges must detonate simultaneously
Round up to the next 1/2 foot
Columns: 4' or less
in diameter or thickness
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12B30 / 12C30 / CET - B03 Slide # 21
PROBLEM
Calculate the minimum amountof C-4 (M112) required to breach80 concrete cubes, 3' thick.
3'
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12B30 / 12C30 / CET - B03 Slide # 22
SOLUTION
Step 1. 3'cubes, concrete, C4, 80 ea counterforce
Step 2. 3 x 1 1/2 lbs per ft = 4.5 lbs explosive
Step 3. N/A
Step 4. 4.5 = 3.6 4 pkgs C-4
1.25
Step 5. 80 cubes = 80 charges
Step 6. 80 x 4 = 320 pkgs C-4
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12B30 / 12C30 / CET - B03 Slide # 23
PROBLEM
Calculate the minimum amount of packages of M118 sheet explosiverequired to breach 50 cylinders,4' in diameter.
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12B30 / 12C30 / CET - B03 Slide # 24
SOLUTION
Step 1. 4'dia., 50ea. cylinders, M118 pkgs,counterforce
Step 2. 1 1/2 lbs per foot x 4 feet = 6 lbs explosives
Step 3. N/A
Step 4. 6 = 12 sheets M118
.5
Step 5. 50 cylinders = 50charges
Step 6. 50 x 12 = 600 sheets
600 = 150 pkgs M118 (sheet)4
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12B30 / 12C30 / CET - B03 Slide # 25
BREACHING
HARD-SURFACEPAVEMENT
Pavement6" Thick
A. One pound of explosive for each 2" of pavement thickness
B. Tamping is twice as thick as pavement
EXAMPLE
1. 6" - 2" = 3 x 1lb = 3 lbs explosive per charge..
2. 6" x 2 = 12" tamping per charge
Tamping