Design and implementation of Curtain Wall System Johnny Choi - PDF document

Design and implementation of Curtain Wall System Johnny Choi Permasteelisa Hong Kong Limited 38

Cur Curtai ain Wal n Wall T Technologi ogies & S es & Systems ystems First Gener Fi rst Generati tion on PERMASTEELISA GROUP PERMASTEELISA GROUP � Curtain Wall members are “Stick Wa “Stick Wall ll Sy Syst stem” em” fixed piece by piece Cur Curtai ain Wal n Wall P Prese esentati tion on � Vertical members are usual installed 1st, which span from Fo For r slab to slab Ho Hong K ng Kong Ins Institute e � Horizontal transom members of of in turn are fixed to mullions � Finally glass / granite / Steel Constru Constructi ction aluminium panels would be BY fixed Mr. Johnny Choi 21st April 2006 Adva Advanta ntages ges (of Stick Wa (of Stick Wall Syst ll System em) � Great Flexibility � Site Modification is possible Common problems inherent Di Disadva sadvantages ages the 1st Generation C/Wall � Difficulties in quality control • Water penetration � Relies heavily on site workmanship • Poor acoustic and thermal � Requires different trades men insulation • Deterioration of expansion � Difficult to accommodate building movements joints and sealant joint � Impossible to control water drainage to individual floor � Requires external access (scaffolding / gondolas) � Too many loose parts and component on site � More storage space and longer storage time on site nd Generation 2 nd neration Pressu essure E re Equalizati ation Syst n System em “ Based on a simple physical principle that in “Unitized Curtain Wall System” equalized pressure conditions, water is heavier than air & therefore falls under gravity”. � Pressure Equalization System � Unitized Panel Systems

3 Aspects 3 Aspects must occur for w ater to must occur for w ater to Pressu essure E re Equalizati ation Syst n System em penetrat ate a b e a building � The 1st Factor (Water) is impossible to eliminate � For many years, many C / Wall companies have tried 1. Wa Water ter 1. the 2nd factor (closing all the holes) - including today 2. Holes Holes 2. � This proved difficult to achieve 3. Diff Differ erential ential Pr Pressur essure ( (or condensat condensation / ion / � The 3rd factor (to address the differential pressure) 3. became feasible by adopting the principle of Pressure capillary action capillar action) Equalization � By eliminating one of the above conditions, the leak will not occur. Principle of “Pressure Equalization” Unitized Curt Uni ed Curtai ain w n w all Syst stem em The Principle is simple & efficient: � Units are assembled & glazed in factory � Usually all components are included within the units � Panels are packed on metal or timber pallets � Transported to site by semi trailers � Hoisted to required floor level by tower crane � Eliminate Pressure difference at level of Joint � Site installation teams shall install individual panels to � Ensures Internal Joint is never in contact with water designated areas (using a monorail or mobile floor � Therefore small gaps in sealant / gaskets will not crane) produce water leaks but only small air losses when windy. rd Gener Uni Unitized Curt ed Curtai ain w n w all Syst stem em 3 rd Generation tion Has several advantages: � Units are assembled & glazed under controlled shop � Improvements of Techniques conditions. � Full pressure equalization drainage system at each � Diversification of its use floor � Speed of communication which resulted in � Accommodates building movements globalized products � Minimizes site operations � Products which draw from experiences worldwide � Usually does not require external access � The third generation is marked by innovations and � Shortens Construction Duration solutions. � Enables other subsequent internal trades to commence works much earlier.

Struct uctur ural Sealan Sealant & & Application Application Basically there are 2 types of structural sealant rd Ge 3 rd Gene nera ration tion applications: � 4 sided structural glazing, & Innovations & Solutions: � 2 sided structural glazing � Innovative production lines � Improved pressure equalization panel systems � Improved Thermal & Accoustic Properties � Some notable improved materials - Structure Sealants - Structural adhesives (Light composite panels) - Performance Glass - Aluminium Finishes / Coatings 2 sides structural glazing ~ vertical bead 2 sides structural glazing ~ horizontal bead 4 sides structural glazing 4 sides captive glazing

One unit One unit one unit Struct uctur ural Sealan Sealants & App & Application lication Sealant width (bite) often determines the width of a For technical information relating to structural sealant mullion e.g. • WL = 3.5 kPa x 1.4 = 4.9 kPa products, we recommend contacting these reputable • C/W modulation 1500mm suppliers: WL x ½ short span (mm) Sealant = Bite 138 (Design Strength of Sealant) � Dow Corning � General Electric 4.9kPa x ½ (1500mm) e.g. = 138 Sealant bite = 26.6mm say 27mm Please also note width of double side tape shall be added to this figure (which is usually 6mm - 10mm). Perf Performance G ormance Glass ass Perf Performance G ormance Glass ass � Recommend contacting major glass suppliers direct for � There is a wide range of glass available on the market specific individual needs & performances. which varying performances considerably based on: - Reflective Coatings � Some reputable glass manufactures - Low Emission coatings (Low E) - Viracon - pyrolytic coatings (hard coating) - Glavabel - sputtered low emissivity (soft coating) - Pilkington � Type of glass treatment - China Southern Glass - Anneal glass ~ direct from float line - Shanghai Yaohua Pilkington - Heat Strenghtened Glass - Tempered Glass

Alum Aluminium inium Finis inishes hes / Coat / Coating ing PERMASTEELISA IFC2 � Large range of paint types & finishes available Address: 1.L. 8898 Harbour View � Some reputable paint suppliers Street, Central, Hong Kong * Interior Client: Central Waterfront Property Development - AKZO Nobel (Powder Coat) Ltd. Architect Cesar Pelli & Associates * Exterior (overseas): Inc. - PPG (PVF2) Architect Rocco Design Limited (local): - Valspar (PVF2) Consultant ARUP Façade Engineering Main Eman-Sanfield J.V. Contractor : Construction Co., Ltd PERMASTEELISA - Design PERMASTEELISA - Design PERMASTEELISA - Design PERMASTEELISA - Design

PERMASTEELISA - Design PERMASTEELISA - Design Verification Structural Test Water Test - Static & Dynamic Water Pattern under Static Pressure Water Pattern under Dynamic Pressure Pull out Test for Washer Tieback PERMASTEELISA - Production PERMASTEELISA - Machining

PERMASTEELISA - Assembly PERMASTEELISA - Glazing PERMASTEELISA - Structural Sealant Application PERMASTEELISA - Packing PERMASTEELISA - Storage PERMASTEELISA - Loading

PERMASTEELISA - Arrive Job Site PERMASTEELISA - Vertical Transportation PERMASTEELISA - Unloading from Platform PERMASTEELISA - Dispatching PERMASTEELISA - Pre-installed Floor Brackets PERMASTEELISA - Panel Installation

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