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Hollow core presentation
Transcript of Hollow core presentation
Hollow Core Slabs
Hollow Core Slabs are commonly used for multi-story commercial, industrial, institutional and residential buildings that require sound barriers between floors.
What is a Hollow core slab
How to approximately size the thickness of a Hollow Core Slab floor
Hollow core slabs come in many different shapes and sizes.
4in., 6in., 8in., 10., 12., & 14in., 8in. thick slabs are most commonly used
Common slab widths:
3ft., 4ft., 8.,
spans can vary (its best to ask a structural engineer)
Examples of Hollow Core Slabs
Hollow core span calculator
Faster construction times with quick installation by highly skilled crews
Hollow core concrete slabs when installed allow for immediate access below and provide a working surface
Hollow core slabs are less weather dependent when being installed
Less material is used when creating a hollow core slab
Many surface finishes and patterns available
Services (for power, water, etc.) can be cast in
Can be load-bearing or non load-bearing
High strength, factory produced, precast concrete offers the ultimate outcome with minimal maintenance.
Hollow core can span long areas thus allowing for less use of supporting beams and columns.
Advantages of Using Hollow core Slabs
Disadvantages of Hollow core slabs
Irregular shaped Hollow cores are fairly costly
They must be made in segments that will fit their transport
Transport can be costly dependent on distances
Cannot be cut on site, must be carefully designed
Retail and bulky goods
Industrial - warehouses and factories
Health and aged care
Cinemas and theatres
Clubs, libraries, churches and community centres
A Detailed view of how Hollow core slabs are manufactured
How Hollow Core Slabs are Created
: A bed cleaning machine, cleans
and dries the casting beds
A wire pulling machine pulls wire along the beds to the anchoring and tension positions.
The wires are anchored and
tensioned to to a desired amount
Concrete is poured into a
The molder casts the concrete into the desired shape
Once the Hollow Core is set they are then cut by a automated cutting machine into desired lengths.
The stacker then collects the slabs and takes them away to the storage facility
The slabs are then loaded onto trucks and shipped off to the customer
FRR of a Hollow Core Slab
Hollow core slabs are
concrete elements generally used for flooring. They are also known as voided slabs or hollow core planks
Hollow Core Slab options
This is rarely done in practice as it causes penetrations in the slab and is difficult for maintenance.
Usually not cantilevered more than 4'. This depends on the slab thickness; rule of thumb is cantilevering the slab 6-12 times it's thickness. Also not recommend for balcony design, for water has a good chance of getting into the voids in the slab.
If a structural topping is required it must be a minimum of 2" thick and bonded to the slab. Walls are then placed on after.
8" Hollow Core has a STC rating of 50. If a higher rating is required, resiliently attached layers of gypsum board or other building materials can be added
Canadian Precast Prestressed
Hollow core slabs have tubular voids that extend the full length of the slab. This reduces the dead load of the slab by 40%-50% compared to site cast slabs.
Trailer / transportation Loading techniques
Hollow core wall slabs can be used for industrial and commercial buildings for non load-bearing cladding or as load-bearing walls.
Hollow core span Table
When hoisting hollow cores the load must be balanced to prevent slippage.
A combination of clamps, belts, chokers, and forks are used to safely hoist hollow-cores into the air. It is common to use a spreader bar to help distribute the load.
Can be designed for 1-4 hour ratings
More than 30 standard fire tests have been conducted on hollow core floor assemblies
Long Life Span
Methods and Materials 5 Presentation
Kris Czubik, Kaitlin Hebb,
Brittney Phannenhour, Scott Wright
Hollowcore to CMU
Hollowcore to poured concrete
Poured Concrete Details
End to End Bearing
End to Side Bearing
No Bearing (Side)
Side Bearing (Half)
End Bearing (Half)
Notched Wall- Side & Half
Can be used to conceal electrical wiring or mechanical ducts.
For example, routing of a lighting circuit through the cores can allow fixtures in an exposed slab ceiling without unsightly surface mounted conduit.
Slabs detailed to distribute heated air through the cores can be used as the thermal mass in a passive solar application.
PEX tubing can be run through the voids to transport water at the same time as heating the floor surface