Trench Rescue(Definitions) Flashcards Preview

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Flashcards in Trench Rescue(Definitions) Deck (16):
1

active soil

soil that has the ability to contain potential
energy

2

air knife

pneumatic tool used to cut away dirt using
a high velocity jet of air

3

angle of repose

angle at which loose particulate products
will support their own weight.

4

stable position shows that ____ has less
effect on the soil/product than the _____

gravity
natural cohesion of the soil/product

5

trenches have the same 8 hazardous
atmospheres as CS

oxygen enrichment
oxygen deficiency
flammable vapors
toxic vapors
flammable vapors within 10% of LEL
substance concentrations that
exceed PELs
airborne combustible dust at it's LEL
particles of combustion

6

if trenches are _____, then they need to
be air tested. they are tested for 3 things.

4' deep or deeper
oxygen saturation
flammability (gases must be < 10% LEL)
toxicity (gases must be < their toxic levels)

7

air testing priority is _____ as CS

the same

8

authorized entrants for Trench Rescue
must be able to do 8 things

use proper PPEs
safely enter and work in the space
use proper equipment
ID and alert attendant for hazards
provide status updates
monitor for evacuation alert
attach safety line to victim
perform self-rescue

9

backfill

the material used to refill a trench

10

backfilling

refilling the trench

11

batter boards

series of horizontal boards spanning a
trench that are used to set the line and
grade of a pipe

12

bedding

fine stone or sand placed in the bottom of
the trench to be the foundation for pipes

13

bell pier

when the footing excavation or shaft has
a larger cross-section on the bottom than
the top

14

if a bell pier condition is created by ____
than you have an extreme potential for
_____.

water
collapse

15

benching

cutting walls of a trench so that steps
are formed

16

benching reduces _____ and ____ on
trench walls

gravitational forces
unconfined compressive forces