Experience Sharing Workshop on

Research and Development 2015

(Group 5)(Group 5)(Group 5)(Group 5)

Mr. LAU Koon-ming

Chief Quantity Surveyor / 2

18 June 2015

Accomplishments with Stakeholders in Quantity Surveying Works

1. Benchmarking HA Construction Cost against Residential Buildings in Private Sector

2. Compilation of Housing Authority's Standard Conditions of Contract in Capital Works New Works Contract (HAGCC)

3. Electronic Dissemination of Tender Documents4. 5D BIM 5. BIM as a Value Management Tool for Collaborative

Design Decisions

Group 52

Benchmarking HA Construction Cost against Residential Buildings in Private Sector

� Objectives -

� To benchmark superstructure construction cost for HA domestic blocks against that for residential buildings of average standard in Private Sector.

� To identify areas of major differences in costs and outline specifications.

� To identify building elements in HA projects with cost significance for improving cost effectiveness.

Group 53

Stakeholder: Langdon & Seah Hong Kong Limited

� Findings of Study in 2012Findings of Study in 2012Findings of Study in 2012Findings of Study in 2012� Superstructure construction cost of HA Public Rental Housing (PRH) blocks was on average 57% *57% *57% *57% * lower than that of residential buildings of average standard in private sector.

� About 77% of total cost variance attributed to architectural and finishes elements reflecting the difference in choice of finishes materials and provisions of fittings, etc.

� Remaining 23% of the total cost variance was mainly attributed to the differences of BS provisions such as non-provision of decorative and luxurious light fittings and luxurious interior finishes in lift cars, and less adoption of transfer plates in HA projects.

Benchmarking HA Construction Cost against Residential Buildings in Private Sector (Cont’d)

Group 54

Benchmarking HA Construction Cost against Residential Buildings in Private Sector (Cont’d)

� Consultant’s Consultant’s Consultant’s Consultant’s conclusionsconclusionsconclusionsconclusions

� HA’s PRH projects have achieved better cost effectiveness.� Some provisions such as partitions, timber flooring, air-conditioning units and domestic electrical appliances are usually provided in private sector projects but not in HA domestic blocks. If discounting these provisions, the superstructure construction cost of HA site specific rental blocks would be on average 51%51%51%51%

lower than that of private sector projects.

� Structure is a more significant element in HA projects as its cost contributes a higher proportion of the superstructure costs (about 47%47%47%47%) than that in private sector projects.

Group 55

Compilation of HAGCC

� Before May 2014, the Housing Authority (HA) adopted the Government of Hong Kong General Conditions of Contract 1993 Edition (Government GCC) which had been used for 20 years

� A significant number of Special Conditions of Contract (SCC) clauses were made to modify the Government GCC for implementation of HA’s quality housing initiatives and to suit HA’s operation

� The contract documents had become bulky and not user-friendly

BackgroundBackgroundBackgroundBackground

Group 56

Stakeholder: Langdon & Seah Hong Kong Limited

� To cater for HA’s circumstances and requirements

� To embody HA’s policies in respect of –

� fair risk allocation and equitable risk-sharing

� risk management and dispute avoidance

� prompt settlement of claims and final account

� To enhance user friendliness and operational efficiency

� To preserve users’ long established experience with the previous conditions of contract

� To foster collaboration between the HA and Contractors

Objectives of the HA’s Standard Conditions of ContractObjectives of the HA’s Standard Conditions of ContractObjectives of the HA’s Standard Conditions of ContractObjectives of the HA’s Standard Conditions of Contract

Compilation of HAGCC

Group 57

� The HA’s standard Conditions of Contract has been implemented in HA’s capital works new works contracts with tenders issued from May 2014 onwards

� General Conditions of Contract (GCC)

� HKHA GCC for Building Works 2013 Edition

� HKHA GCC for Foundation Works 2013 Edition

� HKHA GCC for Civil Engineering Works 2013 Edition

� HKHA GCC for Miscellaneous Works 2013 Edition

� HKHA Articles of Agreement and General Conditions of Nominated Sub-contract to Building Contracts 2013 Edition

� Special Conditions of Contract (SCC)

� HKHA Standard Consolidated Libraries of SCC for Building, Foundation, Civil Engineering and Miscellaneous Works 2013 Edition

� HKHA Standard Library of Special Conditions of Nominated Sub-contract to Building Works Contracts 2013 Edition

� Appendices to the Conditions of Contract and to the Conditions of Nominated Sub-contract

The Suite of HA’s Standard Conditions of ContractThe Suite of HA’s Standard Conditions of ContractThe Suite of HA’s Standard Conditions of ContractThe Suite of HA’s Standard Conditions of ContractCompilation of HAGCC

Group 58

� Electronic dissemination of tender document (by L10/L10Pro) had been implemented in many building tenders since April 2010

� It was technically feasible

Group 59

Stakeholder: ARCADIS Asia Limited

BackgroundBackgroundBackgroundBackground

Electronic Dissemination of Tender Documents

Tender Distribution (L10/L10Pro System)

Electronic Tender DisseminationElectronic Tender DisseminationElectronic Tender DisseminationElectronic Tender Dissemination

Disc A

Disc B

Disc C

- Front Part, etc.

including Form of

Tender

- BQ in L10 format

- L10 Software Installation Programme

Traditional Tender

�2 sets Tender Documents

+

Additional

Form of Tender

Disc D - Drawings, ref.

document

+Additional

Form of Tender

Group 510

- Addendum for

Front Part, etc.

�

Tender Addendum (L10/L10Pro System)

Traditional Tender

- Addendum to be

inserted to the original

Tender Documents by

hand- Addendum for BQ to

be merged with the

original BQ by L10/L10Pro

Disc

A#

Disc

B#

Electronic Dissemination of tender

Group 511

L10/L10Pro

generated

discWith Priced BQ

information

�+

+

Tender

Documents

Additional

Form of Tender

Technical

Submission

(if any)

Tender Submission (L10/L10Pro System)

Traditional Tender

Form of Tender

(2 copies)

+

+

Technical

Submission

(if any)

+Priced BQ

generated by L10

Hardcopy

Electronic Dissemination of tender

Group 512

� an average of 153 man-hours per building tender or 19 man-hours per foundation tender could be saved after the use of L10Pro;

� the average paper saving per building tender was 68,543 pages, while in the foundation tender, the reduction in the use of paper was 13,147 pages per tender;

� Tenderers have no adverse comments on the use of L10Pro;

� New development on L10Excel that can convert BQ in Excel format into L10Pro environment will soon be launched, RD219 to follow up.

FINDINGS: TIME, RESOURCES AND WAY FORWARD

Group 513

5D BIM

Integrated 5D =

3D 4thD 5thD

Group 514

Stakeholder: China State Construction Engineering (Hong Kong) Ltd.

isBIM limited

BIM

5D BIM

3D Model

Time (4th D)Construction Programme

Cost (5th D)

BQ Rates 5D Database

An integrated 5th Dimensions Approach

Group 515

5D BIM

Cash Flow SimulationCash Flow SimulationCash Flow SimulationCash Flow Simulation

Group 516

5D BIM

Application of 5D BIM and Way Forward

� The quantities generated from BIM model benefit both payment application by contractor and payment assessment by project QS

� Upon linking of construction programme with the model quantity and BQ rates, the construction cash flow simulation can be generated for budget planning and cash flow forecast

� Contractor could further benefit in managing subletting, sub-contactor management and procurement of material

� HA has been exploring the Standard Approach of Modelling (SAM), and the measurement practice for BIM quantity take-off

Group 517

BIM as a BIM as a BIM as a BIM as a Value Management ToolValue Management ToolValue Management ToolValue Management Toolfor for for for Collaborative Design DecisionsCollaborative Design DecisionsCollaborative Design DecisionsCollaborative Design Decisions

� Incorporation of material costcostcostcost and construction timetimetimetime parameters into the design models;

� Comparison between different design design design design optionsoptionsoptionsoptions can be easily and readily obtained in real time;

� 4D-simulation of plant layoutplant layoutplant layoutplant layout and construction sequenceconstruction sequenceconstruction sequenceconstruction sequence for site level operations;

� BuildabilityBuildabilityBuildabilityBuildability of different design options can be accurately reflected and validated in advance.

� This is a retrospective study

Group 518

Stakeholder: isBIM limited

To identify the To identify the To identify the To identify the Best ValueBest ValueBest ValueBest Value solutionsolutionsolutionsolution

To identify the best value solution through studies and evaluation of-

� ArchitecturalArchitecturalArchitecturalArchitectural

� GeotechnicalGeotechnicalGeotechnicalGeotechnical &&&&

� StructuralStructuralStructuralStructural DesignDesignDesignDesign OptionsOptionsOptionsOptions

The process involves multimultimultimulti----disciplinarydisciplinarydisciplinarydisciplinary interactions, maximizing the creative potential of all concerned project team members to achieve the optimum balanceoptimum balanceoptimum balanceoptimum balance....

Quality

TimeCost

Group 519

Option A

selected

Group 520

Option A

selected

Group 521

(3) Options for transfer slab and transfer beam

Option A

selected

Group 522

Based on the quantities extracted from BIM models and after analysing the data. Design Option A has been selected revealing the option requires the least Construction Time in spite of the higher cost as time is the major concern of the project team in this project.