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Flashcards in Concrete Formwork Deck (20)
0

to prevent plywood formwork from sticking:

coat inside w oil,
water resistant glue,
plastic

1

plywood formwork supported with framing termed:

strongback (v)
waler (h)
soleplate (base)

2

prefab steel forms offer:

strength and reusability

3

prefab steel forms often used for:

one-way joist systems/
waffle slabs/
round columns/
special shapes

4

Glass-fiber reinforced plastic offer:

patterns embedded

5

most common formwork

3/4" plywood

6

Form ties

hold form together + prevent collapse

7

Form ties: threaded rods

unscrewed / reused

8

Tie holes

round hole, so tie cut off below surface

9

moves continuously AS concrete cures

Slip forming

10

Slip forming moves at a rate:

6-12" per hr

11

Slip Forming typ used @

continuous surfaces (tunnels/high-rise cores)

12

large fabricated sections of framework
removed once cured
reused in identical section above
used @ highly repetitive units (hotels/apartments)

Flying forms

13

Tolerances:
max var in plumb for whole structure: (in bldgs < 100’)

1” for int. columns
½” for corner columns

14

Tolerances:
for columns/piers/walls = max. var in plumb

±1/4” in 10’ length

15

Tolerances:
finished concrete floors can be specified

from ± ⅛” in 10’ for very flat slabs,
to ± ½” for bull floated slabs.

16

Tolerances:
max var in total length of bldg:

±1”

17

Tolerances:
elevation control points for slab-on-grade

½” in any 10’ bay
± ¾” total length of structure

18

Tolerances:
elevated, formed slabs

± ¾”

19

one of the largest expenses for cast in place concrete

formwork