Transcript Construction – Low Cost Housing Solution

Ultra Thin Shell Dome
Construction
Jay Emery
Dingley Dell Enterprises Limited - UK
Construction – Low Cost Housing Solution
January 5, 2011
Dome Home – A Low Cost Housing Solution
for Emerging Countries :-
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•
Culturally preferred in
many countries
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Low cost
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Quick and easy to build
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Disaster resistant
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Secure
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Fire proof
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Environmentally friendly
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20- 40mm thickness
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Reduced quantity of raw
material used
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Ideal for emerging
countries and disaster
relief
January 5, 2011
Primary Market: Our market research :
RDP Housing South Africa
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Reconstruction and Development Program is
a South African Socio-economic framework
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2 million houses in 5 years
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400 000- 500 000 units per year
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SA Gov: R16-billion( 1.6 billion Euro) RDP
housing & sustainable human settlements for
2010/11
2nd largest world housing construction
program
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It will cost South Africa R1,3-billion ( 143.5
million euro), or 10% of this year's budget, to
rectify badly built (RDP) houses
Pilfering of site materials a major
problem
–
Corrugated steel & wood are stolen from
construction site – Alternative solution now
sought after
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Typical RDP House
January 5, 2011
Construction Process:
Screw piles or Slab laid
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Air form attached with stainless
steel straps
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Air form inflated

Unique window arch formers and
blanking plates are attached
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Glass fibre rebar is tied and
anchored

20mm-30mm thick Layer of
concrete is either hand or spray
applied
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Concrete allowed to set 48hrs
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January 5, 2011
Construction Process cont:
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Air Former is removed and reinflated at next site
Approximately 100-150 Houses per
kit
Window arches and blanking plates
removed
Unique glass fibre reinforced
waterproof concrete top coat is
applied
Cast window frames and door
frames are installed and glazed
Internal stud walls and electrics
fitted
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January 5, 2011
Technical Information:
Type of cement
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Portland type 1
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Size of dome

8M dia – 52M2
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RDP target pricing
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R56k-R70K
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Build time
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3 days
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Durability

80-150 years expected
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Strength

Exceeding 2kn Sqm at 2cm thick
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Concrete mix 30mm
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Standard sieve analysis
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Glass fibre reinforced cap 10mm
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Modified GRC
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Other
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Electrics & plumbing in floor and
internal stud walls
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January 5, 2011
Finite element analysis and structural calculations
20mm GRC structure without glass fibre rebar
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Material(s)
•Result Summary
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Name GRC GRADE 10
General Mass Density 2 g/cm^3
Yield Strength 3 MPa
Ultimate Tensile Strength 4 MPa
Stress Young's Modulus 10 GPa
Poisson's Ratio 0.3 ul
Shear Modulus 0 GPa
Stress Thermal Expansion Coefficient 0 ul/c
Thermal Conductivity 0 W/( m K )
Specific Heat 0 J/( kg c )
•Name Minimum Maximum
•Volume 1695110000 mm^3
•Mass 3390.23 kg
•Von Mises Stress 0.00597724 MPa 6.67419 MPa
•1st Principal Stress -0.636598 MPa 7.68419 MPa
•3rd Principal Stress -2.69216 MPa 0.902609 MPa
•Displacement 0 mm 1.51284 mm
•Safety Factor 0.449493 ul 15 ul
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Von Mises Stress Mpa
3rd principal stress Mpa
Safety factor ul
Displacement mm
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Floor Plans & Costing for Domes
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Test Results 10mm thick GRC sections
These tests were conducted by Graham Gilbert A founding member of the Pilkington glass fibre development team
Dingley Dell’s work on large domes in GRC is another major development. The combination of GRC with GRP rebars expands the use of GRC.
The complementary properties of these 2 materials combined together have been studied for several years but it is the application into large span domes
that is unique. Add to this the use of AR meshes and the resultant structure should prove to be one the strongest, thinnest, most robust and durable
cement based composite in the World whilst still being cost effective.
Congratulations and keep up the good work.
Graham T Gilbert, CChem., MRSC
Standard GRC
Modified GRC
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GRC with glass rebar
Multiple levels of innovation in:
Air form design
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Methods of anchoring domes
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Window arch former & blanking plates
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Proven glass fibre concrete mix design
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Concrete window frame moulding
techniques
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Glass fibre rebar substitution (no corrosion)
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Composite concrete construction
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Reduced carbon footprint per unit
Other uses
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Potable water storage
Bio digesters
Insulated panels
Intellectual Property
Patent application made 2009
Initial searches competed 2010
PCT applications made 2010
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Dingley Dell Product display
Glee International Trade show
Proven track record of innovation
since 1999
January 5, 2011
Commercialisation:
Supplier partnerships required for base
materials in SA: [Portland Cement]
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Demonstrator building in advanced
technology park SA
Latest Dialogue
British Embassy
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Pilot project 20 domes
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License to manufacture: Contractors
Pretoria
Durban
Theewaterskloof
Municipality
Municipality
Charitable Organisations
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Supply of key components in kits
Kits comprise of:
Kit 1: Air form and moulds
Kit 2: Additive ingredients
Kit 3: Glass fibre rebar
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Project O Children of Aids Orphanage
Samaritans Purse
Article 25
Habitat
Domes for the World
Nail Mellon Township Trust
James Caan Foundation
January 5, 2011
Conclusion:
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Your vote of support is all
that stands between my
vision the dreams and the
reality!
A truly viable housing
solution for all of
humanity.
Using a simple process
utilising local labour and
materials
Dingley Dell Enterprises Limited
www.dingley-dell.com
Innovators for GRC and Glass Fibre Rebar Applications
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January 5, 2011