concrete pressures 3

[no1crapenter]

my question is this: i am forming an elevator pit that is aproximately 3' high and 10" thick.i am using dummy snapties and walers in conjunction with strongbacks. one side is plywood form, the other side is undisturbed earth or pouring to the bank.i am wondering if there is more pressure created on my plywood form because of solid bank compared to having another plywood form on other side. and if so what amount increase in pressure would there be?
also wondering where i could get more information concerning this topic
thank you
vince

 

[BRIS]

No - the prssure on the form is due to the weight of wet concrete - there is no more pressure becuase the other side is a solid bank.

 

[jheidt2543]

A good reference is "Formwork for Concrete" by Mary Hurd published by the American Concrete Institute (ACI).

 

[HarryOsborn]

Actually there may be less pressure due to the walers not having to support the "back" form.