# Shared Flashcard Set

## Details

Rescue Systems
Block III
29
Aerospace Engineering
08/07/2013

Term
 Rescue Systems
Definition
Term
 Class 1 Lever
Definition
 1. most useful for lifting objects vertically   2. Force goes down, fulcrum then weight pg. 140   3. Ex. Lever
Term
 Class 2 Lever
Definition
 1. useful for moving objects horizonatally   2. Ex. Wheelbarrows   3. force goes up, weight, then fulcrum
Term
 Class 3 Lever
Definition
 1. force may be sacrificed for distance   2. ex. shovels and brooms   3. fulcrum at the handle forice goes up then weight
Term
 1 person class 1 lever can lift
Definition
 1,500 pounds   - one person with a 5 ton hydraulic jack can lift 10,000Ibs (fulcrum reset at 7" to 4'    - When lifting fulcrum must reset every 2" to 4"
Term
 Lift increments
Definition
 2" to 4" at a time depending on the fulcrum height and distance and the size of the wedge used to support the lift. pg. 143
Term
 Weights of common building materials of structural components
Definition
 1. Concrete: 150 PCF   2. Masonry: 125 PCF   3. Wood: 35 PCF   4. Steel: 490 PCF   5. Concrete/ Masonry Rubble: 10 PCF
Term
 Lumber used for cribbing
Definition
 1. 2x4 and 4x4    2. Douglas fir and Southern Pine    3. Talks to you   4. Rated at 500 psi   5. a finished flat surface has an actual size of 3.5"    *a true 4x4 3 1/2 by 3 1/2    *2x4 is 1 1/2 by 3 1/2
Term
 Rule of thumb cribbing
Definition
 1. each overlapped contact point bearing load is 6,000Ibs   2. multiply by 4 is 24,000Ibs   4. Cross tie crib: 54,000Ibs pg. 149   5. A box crib 6x6 lumber: 60,000
Term
 Contact point to height ratios are as follows
Definition
 1. 4 contact points: 3x length of cribbing   2. 2 contact points: 1.5 x length of cribbing   3. 1 contact point: 1x length of cribbing   *How high cribbing could go!!     *Never build a crib bed higher than three times the length of cribbing in use (to determine the cribbing length measure the shortest side of crib bed from outside of contact point to outside contact point
Term
 Cribbing and Crib beds pg. 148-149
Definition
 1. 2 member x 2 member box crib   a. 4x4 box crib: 24,000Ibs (12 tons)   b. 6x6 box crib: 60,000Ibs (30 tons)   2. 3x3 Member Cross tie Crib   a. 4x4 Cross tie: 54,000Ibs (27tons)   b. 6x6 cross tie: 135,000Ibs (67 1/2 tons)   ***1 ton = 2,000 pounds   *DO NOT STACK CRIBBING MORE THAN TWO HIGH IN THE SAME DIRECTION*
Term
 Breaking and breaching
Definition
Term
 Light frame construction
Definition
 1. Foundation: flush or raised foundation   2. Floors: floor joist located every 12" to 16" on centerwith 1 1/2 to 2" thick concrete   3. Walls: Wall studs located every 16" on center.    4. Roof: roof joist located every 16" to 24" on center.
Term
Definition
Term
 Shoring systems
Definition
Term
 Shoring team
Definition
 1. Shore assemble team: shoring officer   2. The cutting team   3. Waiters   pg. 197
Term
 Shoring system Materials
Definition
 1. Lumber: 2x4 and 4x4    2. Plywood: 4x8 panels  thickness from 1/4" to 3/4"
Term
 Nail and Nail Patters
Definition
 1. Duplex nails   2. 8 penny nail: 150 pounds/ used on plywood    3. 16 penny nail: 225 Ibs/ used on 2" lumber
Term
 Spot Shore- Class I
Definition
 1. Used to stablize floors and ceilings    2. It is unstable    3. I -Form   4. pg. 208
Term
 Two- Post Vetical Shore: Class II
Definition
 1. Stablaize damage floors, ceilings, roofs or replace missing or unstbale loadbearing walls or columns,   2. K -shaped   3. pg. 211   4. Maximum Height: 12 ft   pg. 212-213******(FINAL QUESTION) breaking strength: Designed Load: 4x4 Post: 8ft =16,000Ibs                 10Ft=10,000Ibs                        12ft = 7,000Ibs**** 6x6 Post: 12ft = 40,000Ibs               14ft = 29,000Ibs                16 ft= 24,000Ibs
Term
 Horizontal Shore
Definition
 1. Same as CLASS II   2. X - SHAPED!
Term
 Window and Door Shore
Definition
 Protect entry ways
Term
 Rake Shore: Class III
Definition
 1. Used to support leaning or unstable walls and columns by transfering the lateral forces to the ground.   2. pg. 201
Term
 What is the minimum sized lumber used for compression loads
Definition
 4x4
Term
 What is the minimum sized lumber used to tension loads
Definition
 2x6 or two 2x4's
Term
 How many nails to secure the lumber?
Definition
 5 nails for 2x6's3 nails for 2x4's
Term
Definition
 36 inches (catches 3 ceiling joists)
Term
 What is the double funnel principle?
Definition
 Collect, support, distribute. (We collect the load at the ceiling through the header, support it through the vertical post, and distribute it to the floor at the sole plate.)
Term
 Components of a two post vertical shore
Definition
 ·        (2) 2x4 Diagonal braces (2x6) 7ft. x 6 inches is the maximum length. ·        (4) 2x Wedges, nail behind them t keep in place. ·        (2) Posts can be 4x4 or 6x6, vertical can be 20 Ft. maximum at 6x6 and the distance between them is 4 Ft. maximum for 4x4 and 5 ft. for 6x6. ·        (1) Midpoint brace is required, can be 6 – 11 Ft. ·        (1) 4x4 header with 12 inches leftover on each side. ·        (1) Sole plate same as header, 4x4 with 12 inches leftover on each side. ·        (2) Half gussets 6”x12” by ¾ of inch plywood (It may be one side if no chance of vibration or shock load.)   ·        The maximum height for a 4x4 shore is 12 Ft. unless built as part of a laced post.
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