Masonry Building Question
Masonry Building Question
(OP)
My parish is going to solicit bids for the demolition of a two story masonry building. I'm helping out with writing a scope of work and preparing information for bidders. The building was constructed in 1969 but there are no plans available; so I've had to do some minor demo on my own. Here are some particulars:
115' x 45 in plan, approximately 18 feet in height. The exterior walls (from grade to top of seconf floor)and interior bearing walls are 8x8x16 CMU.
There is a 20 x 72 basement; the walls are 8x12x16 CMU.
The second floor deck and the first(ground) floor deck over the basement is 6"x16" precast concrete plank with a topping.
Two questions - I'm hoping to avoid getting out the sledge hammer, pick, and shovel:
My guess is that the entire first (ground) floor is precast plank and not a combination of plank and slab on grade; in order to avoid differential settlement.Is that logical?
If most of the first floor is slab on grade, would you construct a perimeter wall about four feet deep (this is NE Pennsylvania) to support the exterior walls or just thicken the slab on grade? I'm guessing an 8" block wall on a 12 x 24 concrete footing.
115' x 45 in plan, approximately 18 feet in height. The exterior walls (from grade to top of seconf floor)and interior bearing walls are 8x8x16 CMU.
There is a 20 x 72 basement; the walls are 8x12x16 CMU.
The second floor deck and the first(ground) floor deck over the basement is 6"x16" precast concrete plank with a topping.
Two questions - I'm hoping to avoid getting out the sledge hammer, pick, and shovel:
My guess is that the entire first (ground) floor is precast plank and not a combination of plank and slab on grade; in order to avoid differential settlement.Is that logical?
If most of the first floor is slab on grade, would you construct a perimeter wall about four feet deep (this is NE Pennsylvania) to support the exterior walls or just thicken the slab on grade? I'm guessing an 8" block wall on a 12 x 24 concrete footing.






RE: Masonry Building Question
Us structural guys are pesky critters, we all have our own different ideas on what will save the client money.
No substitute for intrusive surveying.
RE: Masonry Building Question
You would need a wall extending about four feet below grade to prevent frost heave.
Best regards,
BA
RE: Masonry Building Question
RE: Masonry Building Question
I guess I can sledge hammer some of the topping to satisfy my curiosity. Thanks for the opinions. We're going to let this as a lump sum job but I just want to give bidders as much information as possible.
RE: Masonry Building Question
Best regards,
BA
RE: Masonry Building Question
RE: Masonry Building Question
RE: Masonry Building Question
The brick and concrete could possibly be crushed on site to use as hardcore under the slabs or just to fill in the basement.
The environmental aspect may win votes with the school.
RE: Masonry Building Question