Post on 25-Nov-2015
description
Innovative Walling Systems -with special reference to Strongwall Concept Wimal Samarasinghe
Performance RequirementsStructurally sound No water penetration Adequate fire resistance Good thermal resistance Good acoustic properties
Good air quality
No mould growth
Driving Factors Builders ViewCheaper to Build Easy to Build with Minimum Supervision Speedy Construction Quality of construction
Lightweight Minimum Wastage
Cleaner Site
Sri Lanka is not different!!!
Once the construction is completed.
Market Potential - Australia1999-2000 : 1.73 billion Bricks Produced
1999 2000 : 75% - 80% in Domestic Construction
Current figures shows a decline in the brick usagePicture 1- row of houses with bricks exposed.
Why Masonry is Popular?Superior Fire Resistance
Good Acoustic Properties
Good Thermal Properties
Good Structural PropertiesExcellent Properties
Walls tested for fire ratingLoadbearing wall. (fire exposed face) after 3 hours Loadbearing wall after 8 minutes into the test.
Why Masonry is Popular?Different Colours of Bricks
Different Mortar joint Colours
Aspect ratio of units
Visually Appealing
Why Masonry is Popular?
FlexibilityEasy to fit into any shape
Easy to fit into different Lengths and Heights of Walls
Used in Un-reinforced and Reinforced conditions
Why Masonry is Popular?Easy to build & maintainDurablelow maintenanceMinimum SupervisionCheaper if labour is cheaper
Traditionally accepted
Why masonry is not the preferred option amongst builders?Speed of Construction Field built hand constructed nature Age effect of tradesmanQuality Assurance Structural LimitationsHigh earthquake forces Higher dead weights stronger foundations Brittle nature Low tensile bond strength
Innovative Masonry - Slick BrickDriving Factors Speed & quality No filling of vertical joint No trowelling Minimum skilled labour Pre-mixed mortar
Slick Brick Masonry - DisadvantagesHigh precision in bricks costly!
Lack of water penetration resistance
Aesthetically not appealing
Rendering costly!
Innovative Masonry Smart Block & Key
Smart Masonry - ConstructionVery fast assembly of blocks in stack bondContains steel reinforcementsCore filled with pre-mixed groutDo not depend on skilled labour
Smart Masonry Issues of ConcernVery poor water penetration resistance
Unusual appearance
Self aligned lightweight Benex blocks
Benex block wall
Precast panelised wallsNeed heavy lifting equipmentCustom designedManufacturing process is tediousFast assemblyMinimum site labourWalling system is not cheaperCleaner site
Light gauge steel framed walls
Modular housing units
Walltech building system
Walltech building system
Panelised Masonry
Major Construction IssuesCostTime to completionQualityOHS issuesEnvironmental issues
What is Strongwall?Strongwall is a lightweight, solid and strong modular construction system for the construction of load bearing and non-load bearing walls used in the buildings. Currently the system has been licensed to use inAustralia (Hadrian Eco Systems Pty Ltd)Singapore (Newall Pty Ltd)Sri Lanka (Rapidwall Pty Ltd)
What is Rapidwall?Rapidwall is a Sri Lankan company registered in SL
Rapidwall is the licensee to use and market the Strongwall System in SL which is owned by Strongwall International Limited (SIL) in Australia
SIL is also a shareholder of the Rapidwall
It provides a total cost effective solution for housing
The Strongwall conceptA building system invented by Mr George Hanna
Researched, further developed and performance assessed by CSIRO from 2000 2007
Patents have been secured in more than 40 countries in the world including Sri Lanka
The Strongwall ConceptLightweight modular walling system Modules are 250mm wide; Length up to 3.6m, weight approx. 35kg Completely dry wall system Requires only a crow-bar, hammer and a drill Does not require skilled labour Can accommodate services very easily without any chasing of the walls Wall thickness = 125mm
CompatibilityStandard doors and windows are easily fittedCan be used with conventional foundations footings/floorsFacilitate fixings to roof members and floorProvide easy access to wall cavities for plumbing/electrical/gas/telecom services etc.Walls can be finished with standard external and internal finishes, if required
Technical Performance Tested and verified at CSIRO for compliance with BCA No water penetration Non-combustible materials Load bearing up to 2 storey External cladding and internal partitions in high rise buildings Cyclone rated for C3 wind category Earthquake resistant Thermal rating R3 Acoustic rating Rw + Ctr >50 Termite resistant
The SystemPure Simplicity
a proven concepta modular building systema dry-wall system very fast & easy to build
create no wasteno lintelsBuild on conventional foundations 250mm wide & 113mm deepmodules
any window frame can be fittedany door frame can be fittedno screws, No gluesimply connect withKeys & wedges
assembly of A modulesmodules weighs 30kgassembly of B modulesB modules are non-structural
easy to engage B modulescan be rendered, painteda neatly finished wallno chasing for services
What are the elements of theStrongwall System?A module structuralB module non structuralCorner moduleKeys & wedgesFloor bracketRoof bracket250mm long rods
What are the tools required at site?A hammer
A Drill
A Pinch bar
Strongwall material for modules..
Ave. comp. str. >60MPa
Ave. tensile strength >15MPa
Manufacturing:
Extrusion
Casting
Strongwall AdvantagesExtremely fast to assembleCheapest wall system in the market in AustraliaMinimum labour and skill levelNo site wastage at allNo joint filling with sealant/adhesiveNo lifting equipment or scaffoldingNo lintels
No chasing of walls for servicesModules can be saw cut/drilledWall cavity can be very easily accessibleCan be erected under all weather conditionsCan be easily de-assembled and re-used
Australian cost comparison
Chart2
74
105
151
350
Wall type
Cost per sq.m of wall
Sheet1
S
Strongwall$74
Clad framework$105
Brick cavity wall$151
Precast conc wall$350
Sheet1
0
0
0
0
Wall type
Cost per sq.m of wall
Sheet2
Sheet3
Low cost housing for Sri Lanka51.1 sq.m 2 bed room single unit
Low cost housing for Sri Lanka66.3 sq.m 3 bed room single unit
Low cost housing for Sri Lankacluster units - each 51.1 sq.m. 2 bed room unit
Items taken for costingExcavation & rubble foundation with a conc. Plinth
3 thick concrete floor Strongwall module packaging & transportation Building walls Timber doors & windows
One toilet, shower & septic tank Wiring for 7 light points, 3 power sockets and distribution board Plumbing with 1 kitchen tap & sink Painting
Sri Lankan cost for low cost housing
Chart2
11501575
10751475
11751550
With A modules
with B modules
House type
Cost per sq.m of floor area
Rs1150
Rs1075
Rs1175
Rs1575
Rs1475
Rs1550
Sheet1
S
Australian conditions
$/sq.m. of wall area
Strongwall$74
Clad framework$105
Brick cavity wall$151
Precast conc wall$350
Sri Lankan conditions
Low cost housing-2 bed rm single unit11501575per sq.m. of floor area
Low cost housing-2 bed rm duplex10751475per sq.m. of floor area
Low cost housing-3 bed rm single unit11751550per sq.m. of floor area
Sheet1
Wall type
Cost per sq.m of wall
Sheet2
With A modules
with B modules
House type
Cost per sq.m of floor area
Rs1175
Rs1075
Rs1150
Rs1550
Rs1475
Rs1575
Sheet3
Quality Housing
Thank You
VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002VII Structural Masonory Seminar - Brazil - Sept 2002