Introduction to Exactal

and CostX

What is BIM ?

BUILDING INFORMATION MODELING

“The term Building Information Modelling (BIM) refers to the

ability to use, reuse and exchange information of which

electronic documents are just a single component. BIM is much

more than 3D renders or transferring electronic version of paper

documents. By implementing BIM, “risk is reduced, design intent

is maintained, quality control is streamlined, communication is

clearer and higher analytic tools are more assessable”

(AIA 2005)

BIM for PM and QS

3D BIM Structural Model

3D BIM Architectural Model

3D BIM MEP Model

BIM JOURNEY

• FULL SOLUTION?

• IS IT THE END OF ROAD

FOR QS and PM? Or …

• BIM, BIM, BIM means 變、變、變

ALWAYS CHANGING???

THINK AGAIN!!!

Review the BIM Data Structural Wall

Review the BIM Data

Revit Qty: Length 7315mm ; Volume 1.108m3

Structural Concrete Beam

Review Questions

• How does the Project Team utilize the BIM data

stored in the Revit Model?

• How does the Project Team add extra parameters

within the CostX® or Revit ® to store information for

generation of cost reports or schedules?

• How does the QS conduct cross-check such that the

information is correct and accurate enough for cost

estimating purposes?

http://changeagents.blogs.com/.a/6a00d8343326e253ef014e88ea0b8d970d-popup

BIM Workflow Chart

Model Review Checking the

Modelling Method

Review the BIM data

Identify any drawing

discrepancies/ Errors

REVIEW OF BIM MODEL & DRAWING

BIM Model Review

Example: Shading Fins

BIM Model Review

Example: Concrete Slab

BIM Model Review

Example: Metal Railing

BIM Model Review

Example: Air Boot

Model Review

3 Common Methods of Modelling Unjoin and Overlap

Abutting

Join and Overlap

Different Modelling Techniques may give

out completely different answers!

Modelling Technique (1)

Modelling Technique (2)

Modelling Technique (3)

Drawing Discrepancies

Drawing Discrepancies

INNOVATIVE SOLUTIONS

FOR PM & QS

IMPROVE EFFICIENCY

(1) Shared Parameters

Shared Parameter in Revit®

Add extra parameters into DWF ™or DWFx from

Revit®. For example:

• QSID Elemental Code

HKSMM4 Code

Trade code

• Level/Zone

• Concrete Strength

• Reo Rates

Shared Parameter in Revit®

Extra parameters like Beam Width, Beam Height, Slab

Thickness for concrete beams will be appeared inside the

Properties Box in Revit

Example: QSID Parameter

Source: ASD’s SMM for Building Element

Typical Example of Elemental Code for QSID

INSERT QS IDENTIFIER: CONCRETOR \ FLOOR

INSERT QS IDENTIFIER: STEEL AND METAL WORK \ RAILING

INSERT QS IDENTIFIER = WOODWORK \ DOORS

Example: QSID Parameter

QSID PARAMETER: CONCRETOR, E&M, GLAZING, STEEL AND METAL

WORK, WOODWORK AND EXTERNAL LANDSCAPE ETC.

FINAL RESULT

Example: QSID Parameter

User-Defined Properties

User-Defined Properties

Beam Side and Soffit Formwork derived from

Beam Width, Beam Height, Slab thickness

and Cut length dimensions in CostX ®

Add Cost Code and QSID Properties

Adding the relevant cost codes and QSID as User-

Defined Properties into the BIM model, CostX® can co-

ordinate the Rate Libraries with model object libraries to

achieve a high level of automation to the process of

generating comprehensive and fully priced Bills of

Quantities or Cost Estimates from BIM models.

Cost Code Implementation

5D Cost Report

Cost Geometry ® Live links of Workbook

Live-links between drawing files and workbooks mean that change of

dimension is automatically updated in the workbook. It allows QS or

estimators to perceive drawing revisions and update quantities.

(2) Room and Area

Revit ®’s Room and Area

• Room and Area data can be a very powerful tool for Project

Management. They are essential for everything from room names,

finishes scheduling and MEP energy modelling etc.

CostX ®’s Room and Area

• When exporting the file, open the DWG or DWF Properties tab in the

export dialogue window and tick the “Rooms and Areas in a

separate boundary layer” checkbox. The room data will now be

exported with the file.

CostX ®’s Room and Area

(3) System Assemblies

Revit®’s System Assemblies

In Revit ®, multiple BIM objects can be combined into one assembly

object that can be independently scheduled, tagged and filtered.

Revit®’s System Assemblies

Different objects can be grouped in

assemblies and layered elements such

as walls, floors, roofs etc.

CostX®’s System Assemblies

Figure: CostX® screen shot of composite slab assembly

(3) Scheduling

Revit ®’s Scheduling • Revit ® can create a schedule for building component inside the

BIM model. A key schedule let you define key to automatically fill in

some information for the schedule.

CostX ®’s Scheduling

CostX ®’s Scheduling

BIM MODEL ANALYSIS

By Exactal

Clash Detection

Additionally, it is possible to detect clashes between

the various designs produced is a key benefit of BIM

for cost consultants. This can be done through

overlaying the architectural, structural, and MEP

models in software capable of detecting clashes.

Clash Detection between designs would lead to fewer

cost estimate revisions in early project stages.

MEP Fixtures

Architectural

Trades

Ghost View

Clash Detection

ROOF STRUCTURE

F.S. PIPEWORK

BIM MODEL REVISION

By Exactal

Auto-Revisioning

If a revised model is sent through, CostX allows you to compare the models, highlight the changes (green = new, yellow = changed, red = deleted & blue = same) and update the quantities automatically, eliminating the need to redo everything.

BIM Revision Module

REVISION 2 REVISION 1

Revision Module

Revision Module

AUTO DETECTION

Revision – Track Changes

Revision – Track Changes

Revision – Rev.1 QTO Result

Revision – Rev.2 QTO Result

Revision – Revision Log

LEVEL OF DEVELOPMENT

By Exactal

BIM’s LOD Details

• At early design stage, foundation may not be modelled

due to lack of information.

BIM’s LOD Details

• At the detailed design stage, the piling details have been

developed from structural analysis.

BIM’s LOD Details

• At the tender stage, the rebars are also modelled and located inside

the BIM model. 2D plans such as rebars’ typical details can be used

to complement the BIM model.

BIM’s LOD Details

• During the construction stage, more detailed information

is modelled for structural members. Rebars can also be

represented in the model in 3D. It is also acceptable to

represent the details in 2D shop drawings.

BIM’s LOD Details

• Finally, as-built BIM drawing will be recorded after the completion of project.

FINAL WORDS

By Exactal

BIM Execution Plan

Recommended BIM Execution Plan should

include the following topics:

• Project information

• BIM goal & uses

• Each project member’s roles, staffing and competency

• BIM process and strategy

• BIM exchange protocol and submittal format

• BIM data requirement

• Collaboration procedures and method to handle shared models;

• Quality control

• Technology infrastructure & software

The Future of BIM Measurement

• Both Revit® and CostX® can help you move from the Why stage of implementing BIM to the How stage.

• Successfully implemented in multiple companies around the world with great success, many of whom were switching from an older system to BIM.

• Functions like Shared Parameters, Room and Area, System Assemblies and Scheduling are definitely helping the PM and QS to make more accurate decisions.

Supplementing Measurements taken from the Model

• Even though the model does not contain all the necessary information required, both CostX’s and Revit® features allow the user to complete a full and accurate takeoff/schedules

• Manual BIM Measurement was used to take measurements from the model where required

• The supplementing 2D plans were also used to take additional measurements In cases where the model is not fully complete, these features are invaluable.

TO BE “BIM THINKING”

Introduction to Exactal

and CostX