Conventional Breaching (Chapter 11) Flashcards
- What are Opposed Counter Force charges effective against?
Effective against rectangular masonry or concrete columns 4’ thick or less
- What is the rounding rule of breaching radius for External Charge?
Round breaching radius up to the nearest ½ foot
If the amount of charge explosive is less than 5 pounds, how thick would your charge be?
1 inches
- For breaching hard surface pavement, use how many pound of explosives for pavement?
1 pound for every 2 inches of pavement and tamp charge twice the thickness of the pavement
- If N is 2.5 or greater, how many charge should be use?
Round OFF to nearest whole number
- If concrete block with uncertain material factor, how would you identified it as?
Always assume as RF concrete
- For External Charges, Breaching Radius is ____
Same thickness of target
- If N is less than 1.25, how many charge should be use?
One charge
- How would determine if target material cannot be identified?
Assume target consists of strongest material in each specified groups
- The size of tamping should be…
Equal to or greater than Breaching Radius
- What is purpose of conventional breaching?
Used to destroy bridge, abutements, and compound walls
- What is the formula to find the number of charges?
N = W / 2R
Number of charges = width / 2 x Radius
- What is the rounding rule of breaching radius for Internal Charge?
Round breaching radius up to the nearest ¼ foot
- If you required to destroy a mason building with uncertain material, what will be the K (constant material factor)?
Assume it as first class masonry
- How much build up require to prime counter force charge?
Blasting cap required ½” build up
- What is the consideration of counterforce charge?
Charges should be diametrically opposed (explosive divide to 2 equal parts)
Obstacle must have at least 3 free faces or be freestanding
- What is critical factors in conventional breaching?
Size and confinement are most critical factors
charges will not cut rebar reinforcement
- What is the formula for breaching charges?
P = R^3 KC (Pound = route 3 to Kansas City) (Pound = Breaching Radius^3 x Constant for material factor x Tamping factor
- If the amount of charge explosive is 40 pounds to less than 300 pounds, how thick would your charge be?
4 inches
- What is the formula for counter force charge?
Pounds = 1.5 x Breaching Radius
- If the amount of charge explosive is 5 pounds to less than 40 pounds, how thick would your charge be?
2 inches
- If N is 1.25 and less than 2.5, how many charge should be use?
Two charge
- For Internal Charges, Breaching Radius is ____ the thickness of the target?
½ the thickness of the target
- If the amount of charge explosive is greater than 300 pounds, how thick would your charge be?
8 inches
- A counterforce charge relies on what?
Shockwave collision
