G3 - Build Footing and Vertical Formwork Flashcards
What are the three main things to consider when constructing concrete formwork?
Quality, strength and safety
What must the formwork design engineer sign before each concrete placement
A formwork inspection certificate
What is the system of structural supports and bracing required for the support of temporary loads during concrete placement called?
Falsework
Who is responsible for approving the design of all falsework and formwork to prevent injury and formwork collapse?
Professional Engineer
Who must sign, date and stamp all plans and specifications?
Design engineer
What must be done if any on-site changes are made to a gang-form panel design?
Authorized by a registered engineer
What type of concrete surface does resin impregnated paper faced plywood produce?
A smooth finish
What should be done to concrete forms after each use?
Cleaned and oiled
In the single waler snap-tie system, what transfers the concrete pressures from the sheathing to the ties?
Walers and brackets
On large form-work or gang forms, what are the braces commonly attached to?
Strongbacks
What is used to attach cast-in-place intersecting walls to previously cast walls?
Keyway and dowels
What effect does rapid concrete placement have on the formwork?
It increases the concrete pressures on the forms
What is the purpose of concrete control joints?
Encourage cracking along pre-determined lines
What size nail should be used to attach form ply to walers?
2” common
What condition allows footings to be cast in trenches without wood forms?
Stable soil
Which of the following footing forms must be securely weighted or staked to keep it from floating when concrete is poured into it?
Tapered
How much concrete should be placed between the re-bar in footings and the ground?
3”
When should rustication strips be removed?
After the concrete has reach sufficient strength to prevent spalling
What are formwork material quantity calculations based on?
Contact area
What is the minimum horizontal distance between steps in a stepped footing?
600 mm
In what method of pad construction does the lumber not need to be cut to length?
Wrap-around
What are the three categories of bearing raft slab foundations?
On soil, on piles and using buoyancy
What is a caisson?
A large diameter pile made of concrete
If a raft slab is to bear on soil, what is usually done prior to building?
Question 24
Pre-load the building site
If a raft foundation is to be placed on piles over expanding soil, what should be done first?
Compressible material is placed under the slab
What type of high rise foundation works if the soils tend to liquefaction during seismic events?
A raft foundation
What is a heavy block of concrete used to ballast a tall building called?
Mass slab foundation
What are the two types of piling used in foundations?
Bearing and friction
In a group of piles under a pile cap, what is the advantage of having some of the piles driven at an angle?
They resist lateral loads better
What does a pile cap do?
Distribute a load over several piles
What is the term for the ground rising as a pile is driven?
Pile swell
What protects the lower end of a pile while driving?
Pile shoe
Where are jetted piles used?
In sandy soils
What are the two fastest wall forming systems for tall buildings?
Slip forming and self-climbing
In the building code, how is backfill depths against a foundation measured?
From the basement floor to the top of the backfill
For ICF walls where must the horizontal bar be placed and how much coverage is required?
Inner half of the wall with 1 1/4” coverage
According to the BCBC, how much must footings be widened to support each story of ICF construction?
6”
On commercial projects, what is concrete left exposed to view called?
Architectural
At what wind speed should gang forms not be flown at?
55 km/h
