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SMART REINFORCINGBETTER • FASTER • CHEAPER

foreword

MITA (P) 269/06/2003

Dec 2016

Prefab For ProductivityIn this issue of our newsletter, we showcase the productivity improvements which could be achieved from the use of bar mats for slabs with heavier loading. This, together with our welded wire mesh, enables a greater degree of prefabrication for all types of slabs, assisting builders in fulfiling BCA’s requirement that 65% of slabs in local building structures have to be prefabricated.

You will also find in this issue other examples of our extensive range of prefabricated products used in some of our recent projects which have allowed their respective building contractors to save time, labour and money.

As a responsible member of the Singapore construction community and a leader in Better • Faster • Cheaper Total Prefabricated Reinforcing Steel Solutions, we aim to do our part in Singapore’s ongoing drive to improve construction productivity.

Contact us for a consultation for your project today!

Lim Siak Meng Group Managing Director

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42 Storey Residential Building at Robinson Road6 Storey Instituition Building in Jurong – Lift Pit / Raft Foundation B

ette

r

Original bottom slab detail.

• 4.0m deep lift pit integrated within raft foundation.• Reinforcement – T32-100 bothways+T25-100 bothways, top and bottom. • Total weight for stage one 2.0m deep casting - 170 MT covering 330m2.• Reinforcementsuppliedassingledirectionalbarmattospeedupsteelfixingwork.

Lift pit section.

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42 Storey Residential Building at Robinson Road6 Storey Instituition Building in Jurong – Lift Pit / Raft Foundation B

ette

r

Original top slab detail.

• 4 layers of bars for both top and bottom reinforcement.• T32-100 and T25-100 changed to 2xT32-200 and 2xT25-200 bar mats to facilitate steel fixingworkandconcreting.• Each sheet of bar mat weighed between 500 kg to 1250 kg.

1. Laying the BB layer of bar mat.

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Fast

er6 Storey Instituition Building in Jurong – Lift Pit / Raft Foundation

• Total weight for BB and B layer bar mat – 100 MT.• 13 workers took 2 days to lay the mats or 2.9 manhour/MT.• Total weight for lift pit area T and TT bar mat and wall starter bars – 70 MT.• 13 workers took 2 days to complete or 4 manhour/MT.

3. Preparing for the top bar mat for lift pit.

2. BB layer of bar mat completed and proceeding with B layer.

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Fast

er6 Storey Instituition Building in Jurong – Lift Pit / Raft Foundation

• Tying loose bars will take at least 7 to 8 days.• Time savings of 3 to 4 days.

4. Aerial view of reinforcing work in porgress.

5. Lift pit reinforcement completed and ready for stage one casting.

Saved 3 to 4

Days

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6 Storey Instituition Building in Jurong - Trench / Raft Foundation

Trench section.

Original bottom slab detail.

Che

aper

• 2.0m (D) x 6.5m (W) trench raft foundation slab.• Reinforcement – Combination of T32-100,T25-100, T20-100, T20-150 and T13-150.• Total weight - 250 MT covering 900m2.

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6 Storey Instituition Building in Jurong - Trench / Raft Foundation

Original top slab detail.

1. 4 workers positioning the bottom bar mat in place.

Che

aper

• T32-100 and T20-100 supplied as 2xT32-200 and 2xT20-200 to ease congestion of rebar and concreting.• Each sheet of bar mat took only 5 minutes to position in place.

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6 Storey Instituition Building in Jurong - Trench / Raft Foundation B

ette

r • 4 workers took 1 day to lay the BB and B layer for one of the trench measuring 2.0m (D) x 6.5m (W) x 35m (L).• Prefab column stumps were hoisted in place in 10 minutes.

2. BB and B layer of the trench bar mat completed.

3. Prefab column stump installed and topped with F13150 mesh.

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6 Storey Instituition Building in Jurong - Trench / Raft Foundation B

ette

r • The area of 35m (L) x 20m (W) with 2 trenches took 13 workers 4 days (15 hours/day) to complete or 3.1 manhour/MT. • Tying loose bars will take about 7 days.• Savings of 3 days.

4. T layer of 2xT32-200 mats laid.

5. Raft foundation with trench completed, ready for casting.

Saved 3

Days

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Fast

er

• Warehouse post-tensioned slab system with drop panel.• Average of 400 x T10 shear links per 4.2m x 4.2m drop panel.• Total weight of links – 250 kg per drop panel.• Links supplied as prefabricated cages to improve site productivity.

Original drop panel detail.

7 Storey Ramp Up Warehouse at Pioneer Road - Drop Panel Shear Link Cage

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Fast

er • 2 workers took 3 hours to complete placing the cages for 1 drop panel .• Conventional method of tying loose links will take 2 workers 6 hours to complete.• 100% productivity improvement.

1. Links manufactured as 0.34m (H) and 0.72m (H) link cages.

2. Drop panel completed using the link cages.

100% Productivity Improvement

7 Storey Ramp Up Warehouse at Pioneer Road - Drop Panel Shear Link Cage

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Fonda7 Storey Ramp Up Warehouse at Pioneer Road - Post-tensioned Slab Mesh SlabC

heap

er • Warehouse post-tensioned slab system with drop panel.• A9meshspecified.• Mesh scheduled as large sheets of upto 8.0m (L) X 2.5m (W) to minimise lapping.• Mesh manufactured and packed in laying sequence to avoid searching and double handling on site.

Bottom mesh layout.

Top mesh layout.

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7 Storey Ramp Up Warehouse at Pioneer Road - Post-tensioned Slab Mesh SlabC

heap

er

• 5 workers took 2 days to complete laying top and bottom mesh for an area of 2400m2. • Largesheetconfigurationandsequentialpackingimprovedmeshlayingproductivityby 25%.

1. Large sheet of bottom mesh easily carried and laid by 4 workers.

2. Slab reinforcement completed for casting.

25% Time Savings

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FondaSchool at Sengkang - Prefab Pilecap

• 3.45m (W) x 1.2m(L) x 2.2m(H) pilecap.• Reinforcement – 13 x T25 top + 13+6 x T32 bottom with T25 binders and T13 links.• Total weight – 1.5 MT per pilecap.

(2-PILE GROUP)PLAN

2 - 2 3 - 3

3

3

22

a1a1a

L

D

75F.T

.L

B

b1b1

75D

TOP OF PILECAP

BORED PILE

V,

V1

V,

V1

COLUMN / WALL

B1

B2

V

T1

T1/B1

BORED PILE

H

COLUMN / WALL STARTER BARS

T1H

B2

B1

LEAN CONC.LEAN CONC. BORED PILE

V1

H

1. Prefab pilecap delivered to site for drop in installation.

Original pilecap detail.

Bet

ter

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School at Sengkang - Prefab Pilecap

• 5 workers took 25 minutes or 1.4 manhour/MT to install the pilecap with the assistance of an excavator.• Tying loose bars will take 3 workers 6 hours to complete.• 88% productivity improvement.

2. Hoisting prefab pilecap into formwork using an excavator.

3. Pilecap in position for further placement of column starter bars.

Bet

ter

88% Productivity Improvement

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BRC ASIA LIMITED

350 Jalan Boon LaySingapore 619530

Telephone enquiries 6265 2333 Fax 62664728

Visit our website at www.brc.com.sgOr email us at sales@brc.com.sg

7 Storey Ramp Up Warehouse at Pioneer Road - 13.5m prefab column

• Floor height of 13.5m.• Full height casting.• Reinforcement - 40 x T40 +9 x T10-250• Lapping - 49 x diameter.• Supplied as 2 nos. of prefab column: - 9.0m + lap = 4.8 mt - 4.5m + lap = 2.8 mt• Prefab columns completed in 2 hoists by 3 workers in 30 minutes without the need for scaffolding.• Boom lift was used by workers to work at height at lapping zone to secure the laps and links.• Improved site safety and productivity.