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HCARP1 > G3 LT 4 to 7 > Flashcards

G3 LT 4 to 7 Flashcards

1
Q

According to WorkSafeBC, a professional Engineer must must certify the formwork drawings for Gang forms, true or false

A

True

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2
Q

According to WorkSafeBC, a professional Engineer must must certify the formwork drawings for fly forms, true or false

A

True

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3
Q

According to WorkSafeBC, a professional Engineer must certify the formwork drawings for Formwork more than 4 m (13 ft), true or false

A

True

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4
Q

When constructing forms, the important point in terms of code is whether or not the cured concrete meets the requirements of Code. True or False

A

True

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4
Q

When constructing forms, the important point in terms of code is whether or not the cured concrete meeds the requirements of Code.

A
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5
Q

Which kind of forming material can only be wet for a certain period of time before the concrete is placerd?

A

Fiber Tube Column

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6
Q

How many times can a concrete form be re-used before throwing out?

A

Hundreds of times before thrown out. Watch out for over nailing and nailing too much.

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7
Q

As soon as forms arrive on-site, what is the first step?

A

Forms should be oiled or sealed before use to prevent swelling when concrete is placed. Sort by size and stack the inside forms on sleepers inside the foundation perimeter. The outside forms are stacked outside the perimeter.

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8
Q

When is the damage to forms most common?

A

During the stripping phase. Prevent with proper nailing.

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9
Q

What kind of nails are adequate for nailing panels in concrete forms.

A

1 3/4” finishing nails, as it is the ties that give strength to the forms.

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10
Q

What kind of nails are good enough for blackouts, bulk heads, whalers and strongbacks?

A

Duplex nails.

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11
Q

What tool should you pry concrete forms with?

A

Wooden wedges instead of steel bars.

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12
Q

As soon as forms are stripped, what is the first step?

A

After stripping forms: De-nail, scrape, and oiled to protect forms from the absorbing moisture or rotting an molding during storage.

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13
Q

How should stripped concrete forms be stored after use?

A

They should neatly stacked in a dry area as to no warp them.

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14
Q

What is the order that carpenters use when planning the wall form layout?

A

1) Corners. 2) T panel Locations 3) Steps 4) Full Panels 5 Infill

I C T S F I

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15
Q

If a design is required to be certified by a Professional Engineer, when must the inspection be done by the Professional Engineer?

A

Immediately before placement of concrete or other intended loading.

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16
Q

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

A

24 “ or 600 MM

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17
Q

What is architectural conrete?

A

Concrete surfaces that are left to be exposed to view, they have a nicer & smoother finish usually.

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18
Q

What is the formula for finding the Centreline Perimeter?

A

(Length + Width) x 2 - (4 X Wall Thickness)

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19
Q

What is the formula for finding the contact area?

A

Centreline x height of footing forms x 2

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20
Q

What is the formula for finding the lineal feet?

A

Centerline x 2

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21
Q

What is the formula for finding the slab area?

A

(Length of building - (2 X wall thickness)) X (width of building - (2 x wall thickness)

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22
Q

What is the formula for finding the slab volume?

A

Slab area x slab thickness

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23
Q

What is the formula for finding the diameter

of a column?

A

Diameter = Radius divided by 2

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24
Q

What is the formula for finding the area of a circle?

A

Pi X radius x radius or Pi X (RSquared)

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25
Q

How are simple forms held in place?

A

With wooden or steel stakes.

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26
Q

How are simple form boards held together?

A

With wooden cleats(Straps).

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27
Q

When building a simple footing form, what is done first?

A

It is positioned and staked.

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28
Q

After positioning(leveling etc.) and staking the simple footing form, what is done next?

A

The inside form is then positioned using cleats as spacers and staked in space. The height of the inside form is then set using a hand level working off the outside footing form.

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29
Q

How can you fine tune the height of a simple footing form?

A

Pounding the stakes , they can initially be set a little high.

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30
Q

If a footing is 4 inch thick, what can the projection of the footing be?

A

4 inches.

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31
Q

Why are blockouts for keyways bevelled at 15 to 20 degrees?

A

For easy removal, and the blockout is coated with form oil.

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32
Q

What does a keyway do?

A

It prevents lateral movement on the foundation walls during back-fill.

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33
Q

When footings are placed on sloping rock, what may be required?

A

Dowel may be required to build footings on sloping rock.

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34
Q

In concrete footings, how must rebar be placed?

A

It must be at least 3” clear of the ground and 2” clear from the sides of the footing form.

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35
Q

When ground slopes, what kind of footings are required?

A

Stepped footings.

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36
Q

When are steel stakes best used?

A

When the ground is hard.

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37
Q

What do large column footings support?

A

Tall buidings

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38
Q

What is the purpose for Tapered Pier Footings?

A

Footings for lamp standards

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39
Q

What is a caution with Tapered Pier Footings?

A

The pressure of fresh concrete pushes outward on the forms at a right angle to the form’s face, causing an uplift action.

Tapered Pier footings need to be weighted down to resist upward push.

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40
Q

True or False: 2 by 4 ladder required in the make of Strip Footings with Fabric forms?

A

True

41
Q

What is done before Constructing Wall Forms?

A

After the footings have cured enough the cleats, the footings are swept clean and chalk lines are used to mark the foundation wall locations.

42
Q

The single waler system uses vertical sheathing and horizontal walers.

A

True.

43
Q

The double water system uses horizontal panels, vertical studs and horizontal walers.

A

Studs are required at all verical panel joints.

44
Q

Footing ladders are spaced apart with what?

A

Cleats

45
Q

What do Vertical strongbacks do?

A

Plumb the walls.

46
Q

What kind of plywood is the most common in type used in formwork?

A

Paper faced ply wood. The Resin impregnated paper face stands up to many reuses and reproduces a nice quality finish

47
Q

How do you maintain a deflection of 1:400 for architectural concrete?

A

The tie supports for standard form ply have to be closer than 16” o.c.

48
Q

Why do corners require extra reinforcing?

A

Because the concrete pressure comes from two directions

49
Q

Cross lapping or lacing of the walers in single waler or double waler systems give what?

A

Extra reinforcement to make the corners strong.

50
Q

What is another name for corner locks?

A

Corner locks a.k.a kickers

51
Q

How does the double waler system provide great support for corners?

A

Because studs can be placed near the corners allowing the support from the waler to be continuous from the footing to the top of the wall.

52
Q

How many wedges are needed for each waler?

A

At least 2.

53
Q

Where are wedges placed?

A

Please at least two wedges between joints in upper and lower member of each double waler.

54
Q

When do snap ties carry their full designed load best?

A

If the wedge is positioned midway on the walers with the end of the ties at the wedge’s midpoint.

55
Q

What is the correct way to put a wedge on a form tie?

A

Duplex nails, fasten snug so that they don’t loosen when the concrete is vibrated. Never straighten warped walers with a wedge. Too much load on the wedge may cause the metal spreader on the tie to slip.

56
Q

What kind of corner panels are used in a quick strip system?

A

The corner panels may be loose or joined with a hinge.

57
Q

What is done first when stripping quick strip forms?

A

The waler bar is removed first when stripping quick strip. The ties break off and the waler bar comes free. Pile all the walers and pile neatly.

58
Q

What is required when bracing wall forms?

A

Straighten walls using block and string method. Whenever possible, use adjustable braces. Make sure both ends of the brace are securely fastened.

59
Q

What is the optimal angle for a brace to be placed at?

A

53 degrees

60
Q

Ties on gang forms may be spaced at what distances?

A

Instead of ties being spaced at 16 oc, they may be spaced at 72 oc. They are heavy and require a crane.

61
Q

Where columns are supported on foundation walls, what are formed into the wall?

A

Pilasters

62
Q

What is a pilaster?

A

A thickening in the wall used to support the extra load from the column.

63
Q

A ledge is also called what?

A

An off set

64
Q

What are two ways to block out an opening in concrete forms for windows and doors?

A

Bucks. The other method is to set metal door and window frames into position in the form and place the concrete around the frames.

65
Q

What is a block out for?

A

Voids and recesses must often be created so that beams, pipes or duct work can be installed later

66
Q

What is a main function of a levelling strip?

A

Leveling strips are used to indicate at which height workers should level the concrete.

Leveling strip maybe a wooden chamfer or similar.

The leveling strip will leave a notch in the top of the foundation wall, which will allow the sheathing to overlap the foundation.

67
Q

What is a bulk head?

A

The bulkhead is the end face of a section of formwork, which acts as vertical support to the concrete. They are required at all places where the top of the foundation walls steps in height.

68
Q

What is a reverse key?

A

A piece of wood is embedded in the concrete. Used to attach something in the concrete like doors.

69
Q

What is the purpose of rustication strips?

A

Rustication strips often serve multiple purposes: They provide a decoration on the surface of the concrete and they hide construction and control joints.

70
Q

What kind of wood should be used in rustication strips?

A

The wood should be free of knots and able to be ripped easily. Bevelled on the sides.

71
Q

Rustication strips affect the building how?

A

They shape the finished detail on the building.

72
Q

How can you aid the removal of rustication strips?

A

Make a kerf in the back, this will help the removal. Soaking the wooden strips in form oil for a few days is a good method to ensure ease of stripping as well.

73
Q

Can rustication strips be removed when the concrete is green?

A

No, only after the concrete has sufficient strength to resist damage.

74
Q

What are required for footings to be placed?

A

Position accurate. Correctly dimensioned. Levelling is a good practice.

75
Q

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

A

24 Inches, Minimum Run is 24 inches.

76
Q

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

A

use cleats as spacers and stake in place.

77
Q

What are the first few steps before placing wall forms?

A

1) Strip the cleats off. 2) Sweep footings clean. 3) Mark the foundation wall location with chalk line.

78
Q

How is the bottom plate fastened to the concrete footings?

A

Duplex nail if the concrete is uncured, powder actuated fastener if it has.

79
Q

Which wall forms normally get placed first?

A

The outside corners.

80
Q

Where is the bracing usually placed?

A

The outside of the forms.

81
Q

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

A

The concrete will be exposed as the wall finish.

82
Q

How many times can concrete forms be reused if properly looked after? What should be done to prolong the span of life?

A

Hundreds of times, take good care and nailed carefully.

83
Q

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

A

Locking the outside corners.

84
Q

Explain how to install a wedge for a double waler?

A

The wedge should be installed so the snap-tie button is mid-way between the walers. Do not over drive the wedge and secure against vibration with at least one duplex nail.

84
Q

Explain how to install a wedge for a double waler?

A

The wedge should be installed so the snap-tie button is mid-way between the walers. Do not over drive the wedge and secure against vibration with at least one duplex nail

85
Q

How are waler bars removed when stripping quick strip forms?

A

Strike with hammer or breaking off

86
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.

87
Q

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

A

For shimming, 50 mm is extra is best.

88
Q

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

A

To allow for ease of stripping

89
Q

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

A

Block out

90
Q

Describe how to set a bulkhead in a steel form?

A

Brace to the ties outside the bulk head.

91
Q

How is a bulkhead made easier to strip?

A

Make with lumber instead of plywood.

92
Q

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

A

Drive nails into the formwork, along with a chalk line at the desired pour height.

93
Q

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

A

Wooden wedge or pry

94
Q

Why must rustication be removed carefully?

A

Not to damage the green concrete

95
Q

Explain the stripping process for foundation

A

Orderly & safely remove cleats, 2 by 4, walers, ties and sheathing

96
Q

Explain how to strip and lift gang form panels?

A

Use fall protection, partially strip, attach tagline & crane, tension crane, finish stripping, clean area

97
Q

Explain how to strip and lift slab tables

A

Use full protection, lower jack onto dollies, attach lines to the core, roll out 1/4 way, attach the first pair of slings, roll out and attach 2nd pair of slings. detach lines to the core, hoist out

98
Q

What is re-shoring?

A

Exposed concrete members must be supported until they gain their full design strength. The shoring that is placed under these recently stripped slabs is called re-shoring.

99
Q

If form deflection is exceeding the allowed deflection in drawings, should it stop?

A

yes

100
Q

At what winds should you no longer lift gang forms?

A

Do not lift gang form panels if the wind is gusting to over 55 km / h or 35 mp h

HCARP1 (17 decks)

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