Chap 16 Collapse Of Blds Under Construction

Question 0

Crane collapses occur most often when ?

Answer 0

When overloaded , moved , assembled or disassembled

Question 1

Whst is major life hazard a buildings under construction

Answer 1

Daytime workers stuck on upper floors

Nighttime FFS

Hazard will be the fire and collapse of structure

Question 2

The worst type of crane collapse is when

Answer 2

They fail and collapse on nearby buildings both building being worked on and nearby buildings

Question 3

Collapse zone is equal to

Answer 3

Height of crane

Question 4

What should be used to protect crane operator at fires in buildings under construction

Answer 4

Master stream

Question 5

Two types of framework used high rise structures are

Answer 5

1. Reinforced concrete

2. Structural steel

Question 6

What is the strategy in cast in place structure fires

Answer 6

Defensive attack

Question 7

Steel in cast in place structures provides what type of strength to the concrete

Answer 7

Tensile strength

Question 8

According to Dunn how long does it take for concrete reach it’s maximum strength

Answer 8

27 days

Question 9

According to Dunn in how many hours after the concrete is poured in cast in place buildings will it have enough strength so that the wood form work can be removed

Answer 9

48 hours

Question 10

Shanty Fires a CDA buildings

Answer 10

Are supposed to be at least 30 feet apart and made of no combustible construction and cannot be group together
Number one ignition source is portable heaters to close to combustibles

Question 11

What is recommended to attack fires in the wood form work supporting the floors

Answer 11

Aerial master stream

All ffs removed from building during operation

Question 12

Equipment hoist at buildings under construction

Answer 12

Should not be used even if construction workers. Suggest

Ff may use material hoist to bring ff equipment to,upper floors

Question 13

If two elevators are present at building under construction you will know the material and equipment hoist by

Answer 13

The one supported by one or two cables
Uses bell system to reach upper story
Bell sounds similar to SCBA warning alarm
No safety brakes
Flames weaken supports it will drop to ground

Question 14

Hoist designed to lift construction workers will be

Answer 14

Operating controls inside car
Operator operates inside car
Has safety breaks