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Hollowcore has been around for over 40 years. Learn the basics of Hollowcore as well as some new ideas adapting to environmental needs (LEED) and energy efficiency from this tutorial. Hollowcore attributes include versatility, creation of long spans and open spaces, fast track construction, control of flexural cracking, zero tension possible in bottom flange, minimal site labour, and low long-term maintenance costs or, in short, VOS-C.
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Precast Prestressed Hollowcore SlabsFebruary 26, 2014
Scott L Marshall P. Eng.&
Ebi Moradi P. Eng.
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Introduction
Scott L
Scott has worked the last 35 years with Armtec in Engineered Precast Concrete Solutions in marketing and sales, providing technical and budgeting advice to Engineers and Contractors in regards to precast prestressed concrete bridge girders, marine structures and industrial structures.
Scott was involved in the development of the hybrid system of using precast concrete Hollowcore slabs and cast in place slab bands and columns on most of the Real Canadian Superstores in BC and most recently the Uptown Mall in Victoria.
Scott Marshall P. Eng.
Senior Business Development EngineerEngineered Precast SolutionsArmtec
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Introduction
Ebi has over 20 years experience in precast concrete in sales, marketing and operations, providing technical and budgeting advice to clients in regards to various application of precast and pre-stressed concrete components such as parking structures, architectural claddings, insulated wall panels, and Hollowcore.
Ebi Moradi P. Eng.
Senior Sales Engineer & Project ManagerEngineered Precast SolutionsArmtec
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Introduction
Armtec is a leading global infrastructure and construction materials company
• 48 locations in Canada, including production facilities and offices in every region
• Global customer base with projects around the world • Approximately 2,000 employees, $500M • Toronto Stock Exchange trading symbol: ARF.UN
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Introduction…legacy Con-Force
• Precast prestressed Double Tees
• Precast columns, beams and spandrel panels.
• Precast prestressed Bridge Girders
• Precast prestressed stay in place deck panels.
• Precast prestressed Hollowcore slabs.
• Precast prestressed piles.
• Architectural panels.
• Insulated wall panels
• RECO MSE walls.
• EPS wall panels.
• Stadium bleacher seats.
• Concrete Sound Fencing….NEW!
• Durisol Noise Barriers…NEW!
Mechanically Stabilized Earth Retaining Walls
BEBO Concrete Arches
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Armtec Richmond BC plant
Armtec bought Con-Force Structures Limited in October 2007
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Current Project – Evergreen Line
$17 Million Supply Contract, 1000 Segments
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Current Project – Evergreen Line
Yarding of Match Cast Segments
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Port Mann Water Supply Tunnel Liners
1,000 Rings, 6,000 Segments
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Port Mann Water Supply Tunnel Liners
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What is Prestressing?
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What is Prestressing?
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Plant Prestressing Beds
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What is Hollowcore (HC) ?
Precast Prestressed Hollowcore slabs
• Primary use is floor and roof slabs• Continuous voids are used to reduce weight and improve
structural performance
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Available Hollowcore (HC) depths
• 8 inch (203mm) slabs span 30 feet (9m) for 100 PSF (4.8KN/m2)
• 12 inch (305mm) slabs span 40 feet (12m) for 100 PSF (4.8KN/m2)
• 14 inch (356mm) slabs span 45 feet (13.7m) for 100 PSF (4.8KN/m2)
• 10 inch (254mm)…subject to machine availability.
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Benefits of Hollowcore
1. Longer clear spans…versatility of space.
2. Fast track construction…$’s to owners
3. Design for control of deflection.
4. Design to limit tensile stress in bottom flange…corrosive environments
5. Immediate working platform on site.
6. Manages field skilled trade shortages.
7. Not impacted by high floor to floor heights.
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Structural Systems with Hollowcore
1. Hollowcore on cast in place slab bands and columns.
2. Hollowcore on steel columns and beams.
3. Hollowcore on precast columns and beams.
4. Hollowcore on masonry walls.
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Hollowcore casting beds
4 casting beds of 300 feet long
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Hollowcore casting beds
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Hollowcore casting machine
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Hollowcore saw
Can saw cut longitudinally and skew cuts
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HC on cast in place formwork
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Real Canadian Superstore - Kamloops - 1999
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Real Canadian Superstore - Kamloops - 1999
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Real Canadian Superstore - Kamloops - 1999
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Real Canadian Superstore - Kamloops - 1999
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Real Canadian Superstore - Kamloops - 1999
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Real Canadian Superstore - Kamloops - 1999
36 foot by 30 foot gridlines for columns
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Cast in place beams around perimeter
Cast in place cord reinforcing at perimeters
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Real Canadian Superstore –Richmond - 2000
Installation inside existing building
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Real Canadian Superstore Projects
1. South West Marine Drive – 1988
2. Kamloops – 1999
3. Richmond – 2000
4. Coquitlam – 2001
5. North Surrey - 2001
6. Abbotsford – 2003
7. North Delta – 2003
8. Mission - 2005
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Electronic Arts – Burnaby - 2004
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Electronic Arts – Burnaby - 2004
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Electronic Arts – Burnaby 2004
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4800 Kingsway - 2005
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Richmond Speed Skating Oval - 2006
First use of 14 inch Hollowcore
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Richmond Speed Skating Oval - 2006
First use of 14 inch Hollowcore
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HC on first stage slab band
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Edmonds Centre – Burnaby - 1992
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Edmonds Centre – Burnaby - 1992
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Wal-Mart South Surrey – 2007
45 foot by 45 foot grid
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Uptown Mall in Victoria - 2008
Wal-Mart - 45 foot by 45 foot grid lines
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Uptown Mall in Victoria - 2008
Wal-Mart 45 foot by 45 foot grid lines
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Uptown Mall in Victoria - 2008
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Uptown Mall in Victoria - 2008
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Anvil Project New Westminster - 2007
Hollowcore and precast frames
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Anvil Project New Westminster - 2007
Precast frames
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Anvil Project New Westminster - 2007
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Anvil Project New Westminster - 2007
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Colebrook Business Centre - 2007
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Colebrook Business Centre - 2007
Hollowcore on precast beams and columns
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The Liu Centre - 2000
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The Liu Centre - 2000
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The Liu Centre - 2000
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HC on steel – Surrey City Centre - 2001
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HC on steel – Surrey City Centre - 2001
10 foot cantilever on 12 inch Hollowcore
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HC on steel – Villa Parkade - 2008
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HC on steel – Villa Parkade - 2008
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“D” Girder System…Marriot Hotel…Edmonton
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D”” Girder System…Marriot Hotel…Edmonton
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Summary
• Hollowcore
• Primary use is floor and roof slabs• Reduce weight and improve structural performance• Cast in 1220 mm widths• Various thickness to match to loading and span
• Benefits
• Longer clear spans - space versatility• Increase speed of construction - early occupancy• Design for control of flexural cracking• Less demand for field labour
Hollowcore
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Today’s Host:
Ebi Moradiebi.moradi@armtec.com604-214-3253
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