G-2 Flashcards
What is falsework?
Temporarily support framework
What is the purpose of form sheathing?
To support and shape the fresh concrete
What are mushroom caps used to protect against?
Impalement, cuts and scratches.
Who is responsible for preparing a plan for all formwork that could possibly cause injury to any person?
The employer
What must a P.Eng. sign before each concrete placement?
An inspection certificate
What should be done if any settlement or distortion of the formwork happens.
If distortion happens the placing of concrete must stop until the formwork has been strengthened and specified and inspected by a professional engineer
What species and grade of lumber would be a good choice for formwork?
Fir/Larch and Grade #2 and better
What is commonly done to concrete forms prior to each use?
Lubricated with a product (usually an oil) that provides for form release
List two kinds of ties that are stamped from sheet metal
Strap ties and quickstrip
Describe a coil toil
The coil of wire that forms the threat at both ends of the tie
Describe overlaid plywood
Formply that has one face covered with and resin-impregnated paper
What is the purpose of a reglet?
Counter flashing fits into the reglet and overlaps roofing material to form a watertight seal
What are control joints used for?
To control random cracking?
What is the difference between an isolation joint and a control joint?
An isolation joint is a space between members that prevent cracking. A control joint controls random cracking
What type of blade is used to cut control joints in hardened concrete?
Diamond toothed blade
Why is the floor slab not cast directly onto the footing?
To allow settling without cracking
What is the minimum depth of a control joint for a slab on grade?
1/4 slab thickness
What material is used for a give and take strip?
impregnated fibre board
Describe three ways of making a control joint in a slab-on-grade
tooled, zip strip and surface cut after 24 hrs. of curing
What is formwork?
Formwork supports and shapes fresh concrete
What is one of the biggest fly forms?
Slab table
What is the purpose of a strong-back?
To support and align formwork?
How many pounds can a quick strip tie carry?
1500 lbs
What tie can carry of 30 000 lbs?
Taper ties
Describe a taper tie
Taper ties are heavy steel rods that are tapered from one end to another
What angle should braces be at?
40 to 60 (book says 53)
What interval should braces be placed at?
every 8ft every 6ft if building is much taller
What is architectural concrete?
Architectural concrete is for looks (details, shapes, statues, etc)
What is required for architectural concrete?
Good formwork, plywood, tie placement, good cement
Do all form ties have the same tensile strength?
No
What are some ways to prevent deflection?
-Put more supports, less space between braces.
-Place ties, whalers, closer
What joint prevents random cracking?
Control joints
What is the main function of a form tie?
-Hold formwork together, clamp system together
-Taper ties don’t have spacers
What type of stock should u always have? (wet or dry?)
Always have partially seasoned stock
What is the best wood for plywood?
Douglas fir
What is the best thickness for plywood?
3/4
What is attached to strong backs?
Braces
What is a reglet?
Reglet is a groove that can be cut in, meant for counter flashing
