G3 - Build Footing and Vertical Formwork Flashcards
(39 cards)
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
