G3 Flashcards
When can footings be cast in excavated forms?
When the ground is stable enough.
3 requirements for footings
Placed accurately, correct size, level
Maximum size step allowed for a step footing?
24” vertically and horizontally
Type of footing that must be weighted or stake is…
Tapered footing
Type of footing used under a concrete wall…
Continuous strip footing.
Explain how strap ties are secured to the studs
3 nails secured each side
Rate of placement is…
Vertical ft per hour of placement.
What controls maximum spacing of the studs in a double walker system?
Allowable deflection ratio, 1/400
What precautions should be taken when placing the concrete in gang form panels?
Not to drop concrete too fast, must not fall through steel as segregation can occur.
Tie spacing used in loose forming vs gang form panels.
Spaced 6ft on Center.
Where is a shear plate used?
Connect scaffolding.
What are the benefits of using Aluma beams for gang form panels?
Strong, light and easy to use.
Composite formwork means?
Uses more than one type of formwork.
What is meant by a patented form system?
Engineered
All components fit
Expensive.
How do insulated concrete forms(ICF) differ from others?
Not stripped
Remains in place
Provides insulation and vapour barrier
Typical ICF components?
Panels and ties
Max aggregate size for ICF?
3/4 absolute max.
3 ways ICF can be laterally supported at the bottom of a wall
Dowels in wall
Key way
Reduce backfill to 4’ or less
3 ways ICF can be laterally supported at the top of a wall.
Floor joists
Use ledger or floor system
Masonry superstructure
Which section of a wall should have rebar for above ground ICF walls?
Middle 1/3rd
When would FRP(Fiberglass Reinforced Plastic) be used to build column forms?
To achieved a smooth finish.
Steel columns are used when…?
Large jobs and there is a high chance of reusability
How can a concrete column finish be improved?
Use a plastic liner?
What types of materials are conical column capital forms made from?
Prefabed metal or FRP
How are column forms held together?
Bolt, clamp and ties
How are column forms adjusted to the exact required height?
Cut short and shimmed up?
What is attached to rough door and window bucks to keep them from moving after the frames are installed?
Wooden key
Why is a buck designed to be slightly larger than the frame to be installed?
To allow for caulking and shimming
Why shouldn’t any of the sides, tops or bottoms of bucks run the full length of the buck?
To allow for easier stripping.
What is attached to a wall form to create a pocket for a beam?
Block-out
Centreline perimeter=
[(Length of building + width of building)X2] - (4X wall thickness)
