precast façade presentation - hkis · content 1) why prefabrication 2) practice – jpn2 3) design...
TRANSCRIPT
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Precast Façade Presentation
for
The Hong Kong Institute of Surveyors
14 July 2012
Orientfunds Precast Limited
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Content
1) Why Prefabrication
2) Practice – JPN2
3) Design Concept
4) Types of Precast Elements
5) Transportation
6) Site Storage Area
7) Lifting Method
8) Consideration
9) Production
Orientfunds Precast Limited
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Why Prefabrication ? (1)
Green Construction (Global Trend)
Less Formwork & Falsework
Less Construction Waste
Less Wastewater (i.e. Less on-site Wet Trade)
Less Scaffolding
Orientfunds Precast Limited
Standardize Installation Procedure
Accelerate Construction Programme
4 or 5 day construction cycle
Shorten On-site wet trades time after
concrete structure completion
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Orientfunds Precast Limited
Why Prefabrication ? (2)
Good Quality
Product Consistency
Better Waterproofing
GFA and / or SC exemption – JPN No. 2
(Non-structural prefabricated external walls)
Aging Skill Labours in Hong Kong
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New Practice - Joint Practice Note No. 2
Permit maximum 150mm thickness in GFA exemption
GFA accountable to this
face (for in-situ)
GFA accountable to this
face (under JPN2)
Orientfunds Precast Limited
150 100
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Design Concept
Gravity load supported by upper level floor beam
Horizontal gap between precast façades to prevent load
transfer
Lateral wind load support by a combination of upper
level floor beam and two side walls/columns (3 sides
support)
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Design Concept - Waterproofing (Horizontal Joint)
Above Floor Level Level with Floor
Below Floor Level
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Design Concept - Waterproofing (Vertical Joint)
Precast to Precast
Stitch to insitu column Add post to form
insitu stitch
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Design Concept - Installation
Orientfunds Precast Limited
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Types of Precast Elements
Precast Lost Form
Precast Balcony / U.P.
Precast Façade – Bay Window
Precast Façade – Wall Panel
Precast Staircase
Precast Slab (semi-precast)
Precast Bathroom (volumetric precast)
Precast Beam
Precast Wall/Column
Orientfunds Precast Limited
Residential
Housing
Authority
Commercial
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Transportation
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Total Height of the load and the vehicle : Max. 4.6 m
Total Width of the load and the vehicle : Max. 2.5 m
Maximum Permitted Gross Combined Weight : 24 – 44 tonnes
(depends on types of vehicle)
Traffic Regulation in Hong Kong
Information from:
(1) Road Traffic (Traffic Control) Regulations, &
(2) Road Traffic (Construction and Maintenance of Vehicles) Regulations
Max.
4.6 m
Max. 2.5 m
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Site Storage Area
Recommend to store one storey per tower
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Lifting Method
(I) Lifting “C” Frame (「C」卡 )
(II) Lifting Beam (吊担 )
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Other Issue
Tower Crane
a. Number of tower crane
b. Tower Crane Capacity
Mock Up
a. What to choose? Critical / Difficult Units
b. What material to use? Timber / Metal Formwork
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Consideration
1. Sufficient Site Storage Area
2. Early award of aluminum window contract (6 mths prior delivery)
3. Plumb & drain and electrical embedment layout need to be approved before
mass production
4. Finishing details (tile, al. cladding, granite, glass) need to be approved
before mass production
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Production
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Production
1. Steel Cage fixing
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Production
2. Installation of window
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Production
3. Installation of steel cage
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Production
4. Installation of cast-in items
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Slump test
Making concrete cubes
Production
5. Concreting
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Production
6. Concreting
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Production
7. Demoulding
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Setting out line for tile application
Production
8. Tile laying
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Production
9. Delivery of precast elements
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Thank you