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SMART REINFORCINGBETTER • FASTER • CHEAPER

foreword

MITA (P) 269/06/2003

June 2015

Driving Productivity With healthy construction demand and projects coming on stream, labour continues to be a big concern for builders. Intense competition amongst builders is also affecting margins and profitability.

It is therefore imperative for builders to look at time, labour and cost saving solutions from the onset of the project to ensure delivery of the project on or ahead of schedule.

We are pleased to share some of these solutions in the form of slab mesh, prefabricated walls and columns for various projects that we have undertaken recently.

The Government’s push for better buildability and productivity through labour-efficient construction methods and design remains unabated.

To this end, another S$450 million to drive productivity improvements in the construction sector has been set aside.

In announcing this, Dr John Keung, CEO of the Building and Construction Authority (BCA), said, “Moving forward, our goal is to have more projects adopting a greater extent of Design for Manufacturing and Assembly (DfMA). By transforming construction into a manufacturing process with greater prefabrication off site, there will be less noise and dust during construction. With greater automation in factories, construction can also be faster, less laborious and achieve better quality control.”1

This bodes well for BRC’s Total Prefabricated Reinforcing Solutions philosophy as we step up our research and development activities to support BCA’s productivity drive.

Lim Siak MengGroup Managing Director 1 http://www.bca.gov.sg/newsroom/others/BCA_Media_Release_COS_2015_100315.pdf

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Precast Balcony for Condominium - Engineered Mesh

• Precast balcony with cantilver connection.• Reinforcement – B13, D10, D6 mesh with loose bars.• Irregular shape.• Total weight – 0.18 MT of reinforcement per set.

Original reinforcement detail.

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Precast Balcony for Condominium - Engineered Mesh

1. B13 mesh made to exact shape and configuration - no cutting required.

2. Reinforcement completed, ready for inspection and casting.

• Reinforcement delivered in sets to facilitate steel fixing work. • 3 workers took 1 hour to lay mesh and fix loose bars.• Mesh tailor made to shape to minimise wastage and further cutting on site. • Material saving of 6%.

6% Material Saving

NEW!

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Fonda

• Mutli-storey carpark roof slab.• Reinforcement – D13 topping mesh.• Converted to single directional T13-100 mesh. • Total weight – 11 MT. Fast

erHDB Multi-storey Carpark at Keat Hong - Roof Slab Mesh

Original slab reinforcement detail.

1. Single directional T13-100 mesh to simplify the mesh layout, production, laying and overall productivity.

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• Each sheet of single-directional mesh is less than 100 kg.• 4 workers can carry the mesh easily. • Mesh laying took 6 workers 9 hours to complete.• Productivity is 4.9 manhour/MT.• Conventional mesh will take 2.5 days to lay. • Saved 1.5 days per cast.Fast

erHDB Multi-storey Carpark at Keat Hong - Roof Slab Mesh

2. Mesh laying in progress.

Saved 1.5 Days Per Cast

NEW!

3. Deck completed, ready for casting.

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• Storey shelter wall of nominal size 7.4m (L) x 3.3m (W).• Reinforcement – T10-100 both ways outer face, T13-100 both ways inner face.• Total weight – 3.5 MT.

Original reinforcement detail for storey shelter wall.

Condominium Development at Fernvale - Storey Shelter Wall

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aper • Reinforcement re-detailed into 27 sheets of mesh.

• 6 workers installed the mesh in 2 hours and took another 4 hours to tie the connection bars.• Tying loose rebar for the lower floors took 6 workers 3 days to complete.• Saved 2 days per floor.

Condominium Development at Fernvale - Storey Shelter Wall

1. Installing wall mesh without use of crane.

Saved 2 Days Per Floor

2. Wall mesh installed in 2 hours.

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42 Storey Residential Building at Robinson Road

• Slab area – 1,700 m2.• Reinforcement – E10 mesh top and bottom.• Total weight – 37 MT.Bet

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8 Storey Ramp Up Factory at Tuas - Slab Mesh

1. Reinforcement scheduled as 8.5m (L) x 2.5m (W) sheets.

Original slab reinforcement detail.

1ST STOREY SLAB TOP REINFORCEMENT DETAILS

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42 Storey Residential Building at Robinson Road

• 12 workers took 1.5 days to lay the mesh or 4.9 manhour/MT.• Tying loose bars will take at least 4 days. • Time savings of 2.5 days. Bet

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8 Storey Ramp Up Factory at Tuas - Slab Mesh

2. At less than 180kg per sheet, 3 workers carried the mesh with ease.

Saved 2.5 Days

3. An area of 1,700 m2 completed in 1.5 days.

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• Staircase wall of nominal size 5.8m (W) x 3.0m (L) x 6.0m (H).• Reinforcement – T25-125 (V), T10-200(H).• Total weight – 5.8 MT.• Wall re-detailed into 6 prefab panels.• Each panel took 15 minutes to install by 4 workers.

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6 Storey Industrial Factory at Senoko - Prefab Staircase Wall

Original wall reinforcement detail.

1. Wall reinforcement delivered to site in panels.

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Fonda

• Wall completed in 2.5 hours including tying of connection bars.• Productivity is 1.7 manhour/MT.• Conventional fixing will take 4 workers 2 days to complete.• Time savings of 1.5 days.

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6 Storey Industrial Factory at Senoko - Prefab Staircase Wall

2. Unloading of wall panels.

3. Completed staircase wall.

Saved 1.5 Days

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Fast

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• Slab measuring 40m (W) x 42m (L). • Reinforcement – T16-150 both ways, top and bottom.• Total weight – 11.1 MT.• Rebar re-detailed as one directional mesh.

6 Storey Industrial Factory at Senoko - Slab Mesh

Original slab reinforcement detail.

1. Slab rebar converted to one directional mesh.

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Fast

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• Slab mesh completed in 8 hours by 8 workers.• Achieved productivity of 5.8 manhour/MT.• Fixing loose rebar will take at least 2 days.• Saved 1 day per cast.

6 Storey Industrial Factory at Senoko - Slab Mesh

Saved 1 Day

2. Laying of one-directional mesh by workers.

3. 11.1 MT of slab mesh completed by 8 workers in 8 hours.

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Fonda42 Storey Residential Building at Robinson Road6 Storey Industrial Factory at Senoko - Prefab Column

• Column measuring 1.0m (W) x 1.0m (L) x 7.7m(H). • Reinforcement – 40 x T32 + T13-150.• Total weight – 2.5 MT.• 3 workers took 15 minutes to install the column and another 15 minutes to complete the loose links at the lapping zone.• Conventional tying and installation will take 2 days.

Original column reinforcement detail.

1. Prefab column delivered to site for installation.

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42 Storey Residential Building at Robinson Road6 Storey Industrial Factory at Senoko - Prefab Column

2. Column installed in 15 minutes by 3 workers.

Saved 1.5 Days

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Adoption of Structural Eurocode – Mesh Lapping

With the adoption of Structural Eurocode SS EN 1992:2008 Eurocode 2: Design of concrete structures for structural design from 1 Apr 2015, the product specifications for reinforcement are now based on the following:

Rebar - SS560:2010 – Steel for the reinforcement of concrete – Weldable reinforcing steel – Bar, coil and decoiled product.

Mesh – SS561:2010 – Steel fabric for the reinforcement of concrete.

For mesh, the major difference between the new SS561:2010 and the old SS32:1999 are as follows:

a. Wires used for mesh manufacturing are deformed instead of smooth.b. The weld shear strength of the welded joint is 25% of the yield strength instead of 50%.

Consequently, mesh lapping details are as follows:

a. Weld Shear Lap

b. Long Overhang Lap (Tension Lap)

Engineers should adopt these lapping details when using mesh in their design.

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