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G-3 Flashcards

1
Q

When can footings be cast in excavated forms?

A

when the sides of the excavation are stable enough not to collapse into the footing before or during concrete placement

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2
Q

What type of footing is typically used under a concrete wall?

A

Strip footing

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3
Q

Name four components of wall forming

A

sheating
studs
walers
ties

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4
Q

Explain how strap ties are secured to the studs

A

nailed to the studs on alternate sides

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5
Q

Explain how the forces of the fresh concrete reach the wall form tie

A

concrete preses against the sheating which presses against the studs or walers, which transfers to the wedges and then to the ties

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6
Q

What size of material is used for the walers and studs when using single or double waler form systems?

A

2x4

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7
Q

What controls the maximum spacing of the students in a double waler system?

A

amount of allowable sheathing deflection

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8
Q

What wall farming system doesn’t need to be stripped?

A

insulated concrete forms (ICF)

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9
Q

Describe a pilaster and state its purpose

A

A pilaster is a thickening in the wall resembling a column. It is used to support the extra load from a column above.

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10
Q

Describe a corbel and state its purpose

A

A corbel is a widening in a wall creating a ledge or thickened top. This may be for structural or for decorative purposes.

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11
Q

When would FRP be used to build column forms?

A

Architectural concrete

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12
Q

What is the most common column shape?

A

Round, rectangular

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13
Q

Why are there three size for the same nominal diameter of fibre tube?

A

Transportation purposes

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14
Q

When would steel column forms be used?

A

When there will be many re-uses

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15
Q

How can the concrete column’s finish be improved when using fibre forms?

A

Use a plastic liner

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16
Q

What type of materials are conical column capital forms made from?

A

metal or FRP

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17
Q

Which form requires no banding or column clamps

A

round fibre

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18
Q

How are colum forms held together?

A

Ties, clamp, banding

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19
Q

How are column forms usually adjusted to the exact required height?

A

shim the bottom

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20
Q

What is the advantage of having all side of square column form cut to the same size?

A

sides are interchangeable

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20
Q

What order should the carpenter use when planning the wall form layout?

A

Corners and T-panel locations, then steps, full panels, and infill

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21
Q

For what height of foundation wall does WorkSafeBC OHS Regulation require certification by a P.Eng?

A

4m (13 ft) and higher

22
Q

Is a P.Eng required to certify gang form drawings?

A

Yes

23
Q

What is the maximum height of a step in a footing?

A

600

24
Q

What is architectural concrete?

A

Concrete surfaces that are to be left expose to view

25
Q

What is a serious drawback to using fibre form tubes for columb forms?

A

They will only stand up to being wet for a limited time

26
Q

If the design required to be certified by a P.Eng what must inspection be done by the P.Eng?

A

Immediately before placement of concrete or other intended loading

27
Q

List the requirements for footings

A

Positioned accurately
Correctly dimensioned
Level

28
Q

What is the maximum vertical step allowed for a step footing?

A

600m or 24”

29
Q

Once simple outside footing forms are in place, how are the inside forms postioned?

A

using cleats as spacers and staked in place

30
Q

What are the first few steps before placing wall forms?

A

Strip off the cleats, sweep the footings clean, mark the foundation wall location with chalk lines

31
Q

How is the bottom plate fastened to the concrete footings?

A

Hand nailed if the concrete hasn’t cured, with powder-actuated fasteners if it has

32
Q

Which wall forms normally get placed first?

A

Outside corners

33
Q

Where is the bracing usually placed?

A

On the outside forms (usually to strongbacks)

34
Q

Why is the construction of an outside corner of a concrete wall form so important?

A

Because there are concrete pressures from two directions

35
Q

Why must high-quality forms be used for architectural concrete?

A

Because the concrete will be left exposed as the wall final finish

36
Q

How many times can concrete forms be reused if properly looked after? What should be done to prolong the forms/ usable lifespan.

A

Hundreds of times. Do not be overzealous when nailing or stripping.

37
Q

What are kickers used for when forming single and double waler walls?

A

To lock the outside corners

38
Q

Explain how to install a wedge for a double waler

A

The wedge should be installed so that the snap-tie button is midway between the walers.

39
Q

How are waler bars removed when stripping quick strip forms?

A

Hammer the ties parallel to their width to break them at their break back point

40
Q

What is attached to rough door and window bucks to keep the finished door or window frames from moving after the frames are installed?

A

Reverse keys

41
Q

Why is a buck designed to be slightly larger than the frame to be installed?

A

To allow for shimming of frame at time of installation

42
Q

Why shouldn’t any of the sides, tops, or bottoms of bucks run the full length of the buck?

A

To accommodate ease of stripping

43
Q

What is attached to a wall form to create a pocket for a beam?

A

A blockout

44
Q

Describe how to set a bulkhead in a steel form

A

Braces to the ties outside of the bulkhead

45
Q

How is a bulkhead made easier to strip?

A

Made of lumber instead of plywood, very important when dowels protrude through the bulkhead

46
Q

How is the height of the finished concrete wall indicated if a level strip is not used?

A

Driving nails into formwork along a chalkline at the desired pour height

47
Q

Name three uses for rustication strips

A

Decorative, use as a levelling strip to hide a construction joint, use to create a control joint

48
Q

What type of tools should be used to pry forms loose when stripping?

A

wood wedges, wood bars

49
Q

Why must rustication be removed very carefully?

A

so not to damage green concrete

50
Q

Explain the stripping process for foundation forms.

A

Orderly and safely, remove cleats, 2x4s walers and ties, sheathing

51
Q

Explain how to strip and lift gang form panels.

A

Use fall protection, partially strip, attach tagline and crane, tension crane, finish stripping, clear area

52
Q

Explain how to strip and lift slab tables

A

Use fall protection, lower jack onto dollies, attach lines to core, roll out 1/4 way, attached first pair of slings, roll out and attach second pair of slings, detach lines to core, hoist out

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