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21 Cards in this Set
- Front
- Back
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What is conventional breaching used for |
To destroy bridges piers and abutments ,compound walls etc |
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What are the critical factors of conventional breaching |
Size, shape , placement and tamping |
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What are the most critical factors |
Size and confinement |
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What is the intent of conventional breaching |
To create spalling |
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What formula do you use for rebar reinforcement |
P=D |
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What are the rule of thum for charge thickness |
From. To less than. CT 0lbs. 5Lbs. 1" 5lbs. 40lbs. 2" 40lbs 300lbs. 4" 300lbs. 8" |
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What is the breaching charge formula |
P=RcubedKC |
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How much tamping is required |
= too or greater than the breaching radius |
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What is the rounding rule for external |
Round up to the nearest1/2' |
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What are the rounding rules for internal |
1/2 of BR round up to the nearest 1/4 foot |
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What is the BR of a drilled internal target |
The remaining thickness of the target |
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What are the rules thumb when assuming a targets material |
Assume target consists of strongest material unless if cannot be positively identified |
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What most you always assume for concrete and masonry if it is not known or stated |
Concrete reinforced Masonry first class |
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What is the formula for number of charges |
N=W/2R |
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What are the number of charges rounding rule of thumb |
If N is less than 1.25 use 1 charge If N is equal to 1.25 but less than 2.5 use 2charges If N is equal to or greater than 2.5 normal rounding |
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What is counterforce effective against |
Rectangular masonry and concrete columns 4' thick or less |
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How man faces must the obstacle have |
3faces or be freestanding |
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How should counterforce charges be be placed |
Diametrically opposed |
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Counter force charges rely on what type of collision |
Shockwave |
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What is the measurement rule of thumb and what type of charge is a counter charge |
It's and external charge round up to the next 1/2' |
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What are the tamping factor/C rule of thumb for work quickly and work efficiently |
Work quickly =3.6 Work efficiently =1.0 |
