LINE G4 Flashcards

1
Q

on which kind of surface should slab on grade be placed

A

sub grade or existing soil should be of suitable bearing or compacted fill

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2
Q

What factors affect the durability of slab on grade

A

protection from weather, water/ cement ratio or finishing

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3
Q

what factors affect the strength of slab on grade?

A

base material concrete mix, curing

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4
Q

What should be done to walls or columns that pass through or beside slab on grade?

A

provide isolation joints

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5
Q

why is it important t to compact the sub grade

A

give firm even bearing

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6
Q

why are screeds and forms oiled before oiled before before concrete placement?

A

easy cleaning

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7
Q

how long should slab forms remain in place in place after concrete placement ?

A

As long as possible

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8
Q

What is the difference between a flat plate slab and a flat slab

A

flat plate has a plain soffit, flat slab will have a drop panel or column capital

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9
Q

What advantage do column capitals give

A

increased shear strength and reduces strength span of load

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10
Q

What direction does load carrying steel span?

A

perpendicular to beams

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11
Q

dome pans are used in which type of slab

A

two way (waffle slabs)

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12
Q

what’s a spandrel beam

A

It’s located at perimeter of slab

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13
Q

how does a two way joist system differ from a single joist system

A

two way runs in two directions, one way runs in one

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14
Q

in what sequence does does stripping usually take place

A

beams sides then soffit

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15
Q

What is the first step in setting a beam form

A

place the beam bottoms on the shore system

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16
Q

why does a spandrel beam require a wider shore head than other beams beams or girders or the same width?

A

to provide space for walking

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17
Q

where do beam sided usually sit

A

on the shore head

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18
Q

how are wooden t-shores set to elevation

A

wedges

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19
Q

how are forms for drop panels supported

A

shores stringers and joists

20
Q

What is the slenderness ratio

A

1:50 typical ratio of minimum ratio thickness of post to unsupported height

21
Q

describe three ways shores are made adjustable

A

screw jack, wood wedges, Ellis clamp

22
Q

why are re shores not fitted tightly to the concrete that they are supporting

A

so they won’t place undue pressures on the concrete while reshoring

23
Q

describe a slab table

A

truss shoring, stringer joists, plywood deck, screw jack

24
Q

What are flying forms?

A

fly tables or gang forms

25
Q

how are aluma beams attached to false work

A

slotted bottle and bolt

26
Q

what’s a mudsill used for

A

to distribute the weight

27
Q

using a slender ratio of 1:50 what’s the maximum unsupported height of a rough 4x4 wooden shore

A

16’ 8”( (4x50) / 12 )

28
Q

What are void forms used for ?

A

reduce volume, weight and cost

29
Q

What type of slab formwork uses dome form panels?

A

2 way

30
Q

how is ribbed slab formed

A

using long pans

31
Q

What is a OWSJ?

A

open web steel joint

32
Q

when would a FRP be used in constructing forms

A

architechtural finishes

33
Q

why should a waffle slab be used

A

strength, looks, and lightweighted

34
Q

What would be a typical spacing for concrete joists ?

A

600-800mm o.c

35
Q

how are slab tables constructed

A

19mm ply attached to nailer strips in aluminum joists joists are attached to trusses using clips the truss has adjustable support legs

36
Q

how are adjustable legs used

A

fine tuning fold away for flying

37
Q

How are odd spacers formed

A

infill panels and backer rod

38
Q

who’s responsible for the design of the form work

A

professional engineer

39
Q

when is the first pair of cables attached when relocating slab tables

A

after the tables been rolled out & the first 2 lifting points are exposed

40
Q

list 4 ways to make the flying of the slab tables more efficient

A

Mark the location of shoring, Mark height on supports jacks, match sling ends with lifting points

41
Q

at what wind speed must the job site be shut down

A

over 100km/h 60mph

42
Q

if a member of the lifting found a more efficient method of lifting the slab tables what need to be done n before implementing the idea

A

approval of engineer

43
Q

list the info found on the erection drawings relating to the reshoring of suspended concrete structure

A

reshore plan, strength of concrete, size, spacing order or reshore

44
Q

explain the process that is used to cycle the formwork and re shores for a multi story building

A

form, shore , pour , cure, strip, reshore,

45
Q

how should reshore be placed when there are point loads above them

A

directly under point load, also to support slab

46
Q

how should re shores be placed when there are no point loads above them

A

to support slab and beams, in rows to be braced

47
Q

list two types of reshoring systems

A

post & scaffold