Tapping Quantities from BIM - HKIS › hkis › general › events › bim... · Tapping Quantities...
Transcript of Tapping Quantities from BIM - HKIS › hkis › general › events › bim... · Tapping Quantities...
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Tapping Quantities from BIM
Ir Francis LEUNGDirector / Head of BIM
11/9/2013
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How long do you need to measure … ?
� No. of Blocks = 10
� No. of Units = 963
� Total Floor Area?
� Long list of Floor Area of Units?
� List of Floor Area of Blocks?
� Floor Area of Different Usages?
� External Wall Area with Different Types?
2 WEEKS or 2 DAYS
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How long do you need to measure … ?
� Complex Site Formation …
Net Cut
375,000 m³
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Does the client want to … ?
SAVE
45,000 m³(12%)
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How long do you need to measure … ?
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Which one do you like?
� Get the Quantities quickly
� Get the Correct Quantities
� Get the Correct Quantities quickly
Are the numbers CREDIBLE?
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Typical BIM Objectives
3D Geometry
3D Geometry
Design /
Scheme Study
Design /
Scheme Study
Drawing
production
Drawing
productionQuantity
Take-off
Quantity
Take-off
Typical BIM Objectives
Design /
Drawing
Audit
Design /
Drawing
Audit
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4 Factors for Credible BIM Quantities
� Source of Information
� Model Accuracy
� Modelling Methodology
� Limitation of BIM QTO
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Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
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Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM
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Different Source of Information
≠≠≠≠ ≠INFO
Drawings
BIM
QTO
BIM QTO
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Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM Credible?
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Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM BIM QTOBIM QTO
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Model Accuracy
=INFO
Drawings
BIM
QTO
BIM QTO
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Modelling Methodology
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Modelling Methodology
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WSP Standard Method of Modelling
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WSP Standard Method of Modelling
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Limitation of BIM QTO
Beam side formwork?
Column side formwork?
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Limitation of BIM QTO
� Don’t be shy that BIM QTO is not perfect
� BIMers must be honest to tell the limitation
� Or How to make the BIM QTO perfect
� QS must understand the what the numbers mean before it is used
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4 Factors for Credible BIM Quantities
� Source of Information
� Model Accuracy
� Modelling Methodology
� Limitation of BIM QTO
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QS + BIMers
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