SB 66 Wood Forms For Support Of Concrete Flashcards
One concrete floor poured
Every other day
The day after the floor is poured
It has set up enough to have its forms and supporting studs removed. The floor is the reshored
The method of forming the poured concrete floors consists of
5/8 inch to 3/4 inch plywood held in place by 4x4 wood studs
One shoring 4x4 wood stud is placed
Every 4 feet on center extending from the floor to the underside of the plywood form
The fire load is created by the storage of sheets of plywood and wood studs previously from the cured floor. This lumber is usually found stored
On the floor which is 2 levels below the most recently poured floor and will serve as the forms for the next floor to be poured
Problems associated with structural failure will usually not occur on this
Temporary storage floor. The problem on this floor will be a fast moving fire caused by the heavy fire load and the large open horizontal and vertical areas.
Arriving units must assume that the most recently poured floor was with
24 hours
The structural stability of the actual floor below the most recently poured floor could be considered
Sound
It is required that every floor that has been stripped of its supporting plywood forms and is in its curing stage be
Reshored
During this reshoring one 4x4 stud is
placed every 8 feet and this will usually be found on at least 8 floors below the most recently poured floor
If units observe studs placed every 8 feet apart as they proceed in the building
reshoring is indicated. It can be assumed that these floors are in their advanced curing stage and should not present a problem if exposed during fire conditions
The key to a safe operation is
The knowledge of curing time. However variations in curing time can occur due to temperature, humidity, strength of concrete, etc
If fire involves the plywood forms and supporting studs of a recently poured floor
Some type of structural damage could occur
