Deck 53 Flashcards
What is the major life hazard at a bldg under construction during the day vs. at night?p 83
During the day workers trapped on the upper floors, especially the worker inside the crane.At night the firefighters will be the greatest life hazard,a fire will grow unnoticed into a large fire.
If at a bldg under construction fire is exposing a crane the IC should do what? P 83
- Setup a collapse zone the height of the crane.2. Police will be needed to close off blocks and all nearby bldgs.Workers are often trapped in the cab of the crane during a fire, master streams should be used to protect the worker.
Fires in cast in place structures experience the most serious fire and collapse hazard and suffer the greatest number of major fires of all buildings under construction why?The strategy at this type of fire should be? P 84
Because the wooden frame work is most often involved, creating the capability of a large fire and floor collapse danger.A defensive strategy should be used to protect exposures and extinguish he fire from a safe distance.
It takes about ___ days for concrete to reach its max strength, and after ____ hours, though, concrete has enough strength to the wood frame work to be removed from below and reconstructed above.
Takes about 27 days for concrete to reach its max strength.After 48 hours the form work can be removed and reconstructed above.
Construction engineers state that within 24 hours of pouring the entire concrete floor can collapse on firefighters if the the wood forme work below is evolved in fire, but the Fire Service believes what? P 84 ( new)
The fire service believes this to be an underestimation, a floor collapse can occurs at any time during construction and can trigger a multilevel floor collapse of the entire bldg.Experience shows the most serious fires and most serious collapse in buildings underconstruction occur during a fire in the form work.
Concrete spalling means - The collapse failure of the outer layers of concrete, an incorrect information about concrete spalling can be found in which answer?A. The moisture in concrete is greatest the first 27 days after pouring.B. The outer layer that collapses can be 3”-4” thick, 5’-6’ in area and over 100 lbs.C. Explosive spalling which propels concrete upward with an explosive force is accompanied by a loud noise.D. Spalling concrete whether it is explosive or not can kill firefighters. P 84,85
C. Explosive concrete propels concrete downward, accompanied by a loud noise
Which answer below is not completely correct about worker shanty fires.A. Shanties can be found around the perimeter and sometimes inside the bldg.B. The are required to be non combustible, at least 30 feet from the bldg and not grouped together.C. Worker shanties should be considered a target hazard.D. Careless cooking, portable heaters to close to combustibles, matches , and illegal smoking (the number one reason) are all ignition sources. (new)P 85
D.Portable heaters to close to combustible materials is the number one ignition source.
Asbestos removal at building under construction create a problem during a fire, from the choices below choose the nor that is not entirely correct.A. Asbestos must be scraped off, packaged and transported out of the bldg before demolition beginsB. Floors are done one at a time and muse be sealed tight and placed under vacuum to create a negative atmosphere.C. The plywood sealing prevents ventilation, it cannot be quickly vented.D. The encasing plywood adds combust able material, even if it is fire retardant, it burns fast generating a large amount of smoke.P 87 ( new)
D.If fire retardant plywood is used it will be a slow fire generating a large amount of smoke.
