Confined space

Question 1

O2 limits
< \_\_\_\_ deficient
< \_\_\_\_  rescuer will pant
< \_\_\_\_  rescuer will get dizzy/headache
< \_\_\_\_ unconsciousness
< \_\_\_\_ death

Answer 1

19.5
17
15
9
6

Question 2

CO
Explosive range
SCBA required
IDLH

Answer 2

12.5-74.2
50ppm
1500ppm
1000ppm death in 2-3 hrs
4000ppm death less than 1hr

Question 3

Hydrogen sulfide H2S
LEL
coughing, loss of sense of smell
loss of consciousness/death in 30-60 min
rapid LOC/death

Answer 3

4.3%
100ppm
500-700ppm
700-1000ppm

Question 4

VOlatile organic compounds (VOC)

Answer 4

organic chem with high vapor pressure at room temp. include solvents, paint thinner, nail polish remover, vapors from gas, heat oil, kerosene

Question 5

ductile behavior

Answer 5

ability of a material to stretch/bend without suddenly breaking

Question 6

tension

Answer 6

is two forces being applied through an object at 180 * to each other, usually along the long axis
concrete/masonry have no reliable tension strength

Question 7

shear force

Answer 7

two forces applied directly toward each other (offset) through and object
-square to parallelogram

Question 8

steel starts to loose strength at ___ degrees

Answer 8

700

Question 9

The expansion of steel at 1000 degrees is ___ inches per 100ft

Answer 9

10

Question 10

wood tends to fail

Answer 10

slowly and nosily

Question 11

weight of 
steel
earth
wood
concrete
reinforced concrete

Answer 11

490 lb/cu ft
100 lb/cu ft
40 ib/cu ft
145 lb/cu ft
150 lb/cu ft

Question 12

lateral load is 1% of the building weight for every ___% it’s out of plum

Answer 12

1

Question 13

crushing in wood will occur around ____ lb/sq in

Answer 13

500-700

Question 14

nails to connect members

Answer 14

16d

Question 15

nails for gusset plates

Answer 15

8d

Question 16

T-spot shore

weight rating

Answer 16

temporary shore

1,000-4000lbs

Question 17

double t shore
weight rating
8, 10, 12 ft

Answer 17

16,000
10,000
7,000

Question 18

two post vertical shore rating
4x4: 8, 10, 12
6x6 12, 14, 16

Answer 18

16,000
10,000
7,000
40,000
29,000
24,000

Question 19

door/window shore
4x4
6x6

Answer 19

2,000

6,000

Question 20

prefab window/door
4x4
6x6

Answer 20

2,000

6,000

Question 21

laced post shore
4x4
6x6

Answer 21

32,000
80,000
2 two post vertical shores, laced together
inside shore is a safe haven

Question 22

sloped floor shore
angle of floors
4x4
6x6

Answer 22

15-45 degree
24,000
60,000
*may be less depending on slope

Question 23

cribbing
max slope
4x4: 2x2, 3x3
6x6: 2x2, 3x3
max height

Answer 23

15 degrees
24,000
54,000
60,000
135,000
4ft, 6ft

Question 24

raker shores
Angles
spaced
x bracing is placed

Answer 24

30-60
<8ft on center
at the ends and every 40ft

Question 25

solid sole raker angle 4x4 6x6

Answer 25

45-60 4,000 per raker 5,600 per raker

Question 26

split sole raker angle 4x4 6x6

Answer 26

can be used over rubble piles 45-60 4,000 5,600

Question 27

concrete is strong in ___ but weak in ____ and _____

Answer 27

compression | tension, shear

Question 28

Concrete walls 8 inches will have __ layer of rebar ___ apart >8 inches

Answer 28

1, 8-16 vertical and horizontal 2 layers of rebar

Question 29

T/F rescue teams should not cut post-tensioned cables unless absolutely necessary

Answer 29

T

Question 30

Two methods to cut post-tensioned cables

Answer 30

remove concrete and casing then: 1: use a torch to slowly heat the cable to stretch out the then cut 2: use carbide saw to cut one strand of a time (of 7)

Question 31

inspection hole

Answer 31

hole drilled prior to cutting in order to assess hidden side and account for victim location and safety

Question 32

relief cuts

Answer 32

address tension and shear vs compression. Cut with saw in square, x, or triangle shape

Question 33

bevel cut

Answer 33

angled cut for lift-out ops. limits the slab from falling into the hole

Question 34

step cuts

Answer 34

used for lift out ops when slab is thicker than saw. cut trench and then cut again

Question 35

stitch drills

Answer 35

holes through concrete in a close stitch pattern. similar to relief cut

Question 36

center of gravity

Answer 36

point around which the object's mass is evenly distributed

Question 37

simple MA system

Answer 37

all pulleys move at the same speed and direction

Question 38

compound MA system

Answer 38

one simple system pulls on another simple system and some of the travelling pulleys move at a different speed than the load

Question 39

complex MA system

Answer 39

pulleys move in the opposite direction of the load

Question 40

High pressure airbags at max height ____ max working capacities are _____ lift capacity ____

Answer 40

reduced to 50% added together is that of the smaller bag

Question 41

3 use of airbags

Answer 41

to spread or push to lift and stabilize to prevent rolling

Question 42

load angle factors 60* 45* 30*

Answer 42

1.1 1.5 2

Question 43

shackles

Answer 43

removable links to connect wire/ripe/chain for lifting

Question 44

swivel hoist ring

Answer 44

attached to concrete with expansion anchor, through bolt

Question 45

8 steps for search and rescue ops

Answer 45

``` 1secure the area 2 survey and perform size up 3 shut off utilities 4 rescue surface victims 5 search voids and crevasses 6 call a time out to withdraw and perform a safety size up 7 tunnel and trench to buried victims 8 remove general derbis ```

Question 46

gold strut weight rating

Answer 46

120,000lbs

Question 47

grey strut ratings

Answer 47

40,000lbs

Question 48

gold raker lengths

Answer 48

6' or 8'

Question 49

rules for paratech strut numbering

Answer 49

even #s struts with heigh range? | odds #s extensions?

Question 50

Struts are not designed to accept more than ___extensions with a total combined length of ____

Answer 50

two | 36"

Question 51

high pressure air bags run at ___ psi | low pressure at ___ psi

Answer 51

118 | 14.8

Question 52

weight of dirt

Answer 52

dirt