7th Industrialized Building System (IBS) Roundtable Workshop
ICT in Prefabrication & Precast Housing
An SE CAD Case Study
LIEW YONG SEONG
B.Eng. (Hons.), M.Eng., MIES, MSSSS
Advance Contech (Singapore) Pte. Ltd.
Outline
What is SE CAD?
 It’s been a long way – the SE CAD story
 To maximize repetition through
standardization & serialization
 What’s ahead?

SE
CAD is one of the key
enablers for precast/prefabricated
housing projects like these…
Pinnacle @ Duxton
55-storey interlinked towers with prefabricated reinforcements and
precast structural and façade components
Precast planks : worth to be
considered for site works
efficiency
Reference projects are just a stone throw away
On going projects
Queenstown New development
More than 80% of
Singapore population
live in HDB flats, and
most of them are precast.
The HDB structural system
is prebuilt in SE CAD
precast component
database.
It’s been a long way
streamline construction
processes to meet the
challenges ahead with the
use of advanced technologies
In-situ RC construction
Dependent of foreign labours
 Slow and weather dependent
 Wastages of materials
 Difficult quality control
 Environmental issue
 Non-systematic and non-standardized

>> Solution : prefabrication/precast technology
The road-blocks
Use of conventional software and structural system
hinder the use of prefab and precast technology
No standardization
 Erroneous
 Difficult to check and archive information

Conventional RC design and detailing
The designers and checkers night mare!

Hundreds of drawing to be drawn, checked
and archived
Criteria




For Residential structure
Does NOT rely on proprietary system / components
Centralize database:
 Eg. Joint details
○ Centre reference for tested joint details for beam-wall, beamcolumn, etc.
 Built in proven and tested precast components database of
beam, column etc
Serialize name of structural members for easy reference, order
placing, production and site control, which is also third-party
database friendly

Extendabie – energy saving study, virsualization etc

Super user friendly – for average user to be productive and expert
in doing precast/prefab design.
Goal : A TOTAL Prefab/Precast Solution for Housing!
centralized, reusable knowledge-base and an advanced engineering IT
solution that streamlines construction processes!
Prefab Structural System Development
HDB Prefab Structural System
To maximize repetition through
standardization & serialization
Structural Steel



Better standardization
Steel Database  Universal Naming Convention
Efficient Reference, Design, Checking, and Logistics
BEAM CAGE CODE
J/U/P 3
6
2
1
V
Suffix
Ref. No. indicating
type of main reinf.
Ref. No. or Ref. No. with alphabet
indicating type of stirrups
Depth of Beam
Width of Beam
Cage series
CAGE SERIES



J Series
- Light cage where cage reinforcement are used only for
beams with clear span >1.5m.
- J Series is fully shop fabricated with main bars.
U Series
- Standard cage where cage reinforcement are generally
used for uniformly distributed loading condition.
- Also applicable to light point load condition as specified in
the details.
P Series
- Standard cage where cage reinforcement are generally
used for point load condition.
- Also applicable to uniformly distrbuted loading condition as
specified in the details.
SUFFIXES






S – For one span beam (Discontinuous at both
ends), or for beam with depth difference from
adjacent beams. Eg. J3612S / U3612S / P3612S
V – For tapered beam and for U & P Series only. Eg.
U3621V / P3621V (300X600 – 900)
T – For 1st storey beam tying column / wall (column /
wall at one end or both ends). Eg. U3621T / P3612T
B – For beam with non-standard width. Eg. J3612B /
U3612B / P3612B
D – For beam with non-standard depth. Eg. J3612D
/ U3612D / P3612D
H – For beam using H bar stirrup cage. Eg. U4649H
BEAM CAGE – J SERIES
J SERIES – Main Reinforcement & Stirrup
BEAM CAGE – U SERIES
U SERIES – Main Reinforcement & Stirrup
(1 or 2 layers bottom reinforcement)
( 3 layers bottom reinforcement)
BEAM CAGE – P SERIES
P SERIES – Main Reinforcement & Stirrup
(1 or 2 layers bottom reinforcement)
( 3 layers bottom reinforcement)
BEAM CAGE – “0” CAGE for U & P Series
(ONLY STIRRUP CAGE)
(Main reinforcement are shown in connection details)
BEAM CAGE – T13 BAR MARKED h FOR U OR P SERIES
INCLUDNG “0” CAGE
TYPICAL U OR P SERIES CAGE
BEAM LAYOUT PLAN
A handy tool for design engineers
• Efficient knowledge transfer
• Know prefab, use prefab, love prefab!
What’s ahead?

Year 2011/2012
 Eurocode
 Cross-platform data exchange (BIM)

Further
 Extended shop drawing modules
 Sustainable + Green technologies
We want to hear from you!
LIEW Yong Seong
Email ysliew@advance-contech.com
Phone +65.9276.0058