HONG KONG GENERAL

SPECIFICATION FOR CIVIL ENGINEERING WORKS

The Government of the Hong Kong Special Administrative Region

GENERAL

SPECIFICATION

FOR CIVIL ENGINEERING

WORKS

VOLUME 2

2006 Edition

The Government of the Hong Kong Special Administrative Region

2006 Edition

The Government of the Hong Kong Special Administrative Region

The 1992 Edition was first published in March 1992 First Reprint, April 1993 Second reprint, March 1994

Third reprint, July 1995 Fourth reprint, August 1996 Fifth reprint, December 1997 Sixth reprint, November 1998

Seventh reprint, March 2001 Eighth reprint, October 2002

The 2006 Edition was published in March 2007

Prepared by:

Standards Unit,

Civil Engineering and Development Department,

Civil Engineering and Development Building,

101, Princess Margaret Road,

Homantin, Kowloon,

Hong Kong.

Members of Steering Committee for the General Specification for Civil Engineering Works:

Assistant Director (Technical), Chairman, CEDD Chief Engineer/Land Works, CEDD

Chief Geotechnical Engineer/LPM3, CEDD Technical Secretary/1, DSD

Chief Highway Engineer/R & D, HyD Chief Civil Engineer, HD

Technical Secretary, NTE DevO, CEDD Chief Engineer/Design, WSD

Senior Engineer/Standards, Secretary, CEDD

This publication is available from:

Publications Sales Unit

Information Services Department

Room 402, 4th Floor, Murray Building

Garden Road, Central

Hong Kong

(Telephone No.: (852) 2537 1910)

The book can be ordered both locally and overseas through the following channels:

Visit the online Government Bookstore at www.bookstore.gov.hk

Download the order form from the Information Services Department website at www.isd.gov.hk and submit the order direct online or by fax to (852) 2523 7195

By e-mail at puborder@isd.gov.hk

Future amendments of this publication will be published on the website of the Civil Engineering and Development Department at http://www.cedd.gov.hk/eng/publications/standards_handbooks/stan_gs_2006.htm.

Price in Hong Kong: HK$xxx.00 (in set of 2 volumes)

An additional bank charge of HK$60 or US$7.7 is required per cheque made in currencies other than Hong Kong dollars.

Cheques, bank drafts or money orders must be made payable to The Government of the Hong Kong Special Administrative Region

2

http:HK$xxx.00http://www.cedd.gov.hk/eng/publications/standards_handbooks/stan_gs_2006.htmwww.isd.gov.hkwww.bookstore.gov.hk

2006 Edition

FOREWORD

The General Specification for Civil Engineering Works lays down the quality of materials, the standards of workmanship, the testing methods and the acceptance criteria for civil engineering works undertaken for the Government of the Hong Kong Special Administrative Region. Where necessary, this General Specification should be supplemented by a particular specification.

The 2006 Edition of the General Specification comprises considerable greening of the Eighth Reprint of the 1992 Edition (October 2002) according to the current green practices of the construction industry. It was produced over a 15-month period from March 2005 under the guidance of a Steering Committee comprising members from the main Government departments involved in civil engineering works. The greening of each section was undertaken by a works department with the appropriate expertise. The Standards Unit of Civil Engineering and Development Department (CEDD) was responsible for the overall co-ordination of comments received from departmental circulation, editing and production of the document.

Sustainability is the prime objective of the 2006 Edition. Two new sections, viz. Environmental Protection (Section 25) and Preservation and Protection of Trees (Section 26) have been created. The original Section 22 for Railways Works has been deleted, as construction of railways is no more the responsibility of works departments. The 2006 Edition comprises 26 sections and is posted on the CEDD Homepage on the Internet.

The General Specification will be updated continuously. The electronic files of the sections affected by any amendment issued will be kept up-to-date on the CEDD Homepage.

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September 2006

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2006 Edition

GENERAL SPECIFICATION FOR CIVIL ENGINEERING WORKS

CONTENTS

VOLUME 1

SECTION 1 GENERAL

2 SITE CLEARANCE

3 LANDSCAPE SOFTWORKS AND ESTABLISHMENT WORKS

4 FENCING

5 DRAINAGE WORKS

6 EARTHWORKS

7 GEOTECHNICAL WORKS

8 PILING WORKS 9 CARRIAGEWAYS: SUB-BASE MATERIAL AND BITUMINOUS

MATERIALS 10 CONCRETE CARRIAGEWAYS

11 MISCELLANEOUS ROADWORKS

12 TRAFFIC SIGNS, ROAD MARKINGS AND ROAD STUDS

VOLUME 2

SECTION 13 WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS

14 FORMWORK AND FINISHES TO CONCRETE

15 STEEL REINFORCEMENT

16 CONCRETE AND JOINTS IN CONCRETE

17 PRESTRESSING

18 STEELWORK

19 HANDRAILING, LADDERS, STAIRS AND FLOORING

20 BRIDGEWORKS

21 MARINE WORKS

22 WATER SUPPLY PIPEWORKS

23 WATER RETAINING STRUCTURES

24 BUILDING WORKS

25 ENVIRONMENTAL PROTECTION

26 PRESERVATION AND PROTECTION OF TREES

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2006 Edition

CONTENT OF VOLUME 2

SECTION 13

WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS

Page No.

GENERAL

13.01 General requirements ............................................................................................................. 13.3

13.02 Earthworks ............................................................................................................................. 13.3

13.03 Materials for grout .................................................................................................................. 13.3

13.04 Galvanization ............................................................................................................................. 13.3

GLOSSARY OF TERMS

13.05 Concealed electrical conduit system ...................................................................................... 13.3

MATERIALS

13.06 Electrical conduits and fittings .............................................................................................. 13.3

13.07 Cable ducts and fittings .......................................................................................................... 13.3

13.08 Paint for conduit and duct systems ........................................................................................ 13.4

13.09 Fire barriers ............................................................................................................................ 13.4

13.10 Cement grout for electrical and mechanical installations ..................................................... 13.4

STORAGE OF MATERIALS

13.11 Storage of materials for conduit and cable duct systems ...................................................... 13.4

HOLES AND RECESSES FOR ELECTRICAL

AND MECHANICAL INSTALLATIONS

13.12 Holes and recesses for electrical and mechanical installations ............................................. 13.5

FIRE BARRIERS

13.13 Fire barriers ............................................................................................................................ 13.5

CONCEALED ELECTRICAL CONDUIT SYSTEMS

13.14 Construction of conduit systems ............................................................................................ 13.5

13.15 Installation of conduit systems .............................................................................................. 13.6

13.16 Terminations of conduit systems ........................................................................................... 13.6

13.17 Protection of conduit systems ................................................................................................ 13.7

13.18 Cleaning of conduit systems .................................................................................................. 13.7

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2006 Edition

CABLE DUCT SYSTEMS

Page No.

13.19 13.20 13.21

Installation of cable duct systems .......................................................................................... Protection of cable duct systems ............................................................................................ Cleaning of cable duct systems ..............................................................................................

13.7 13.8 13.8

ELECTRICAL EARTHING SYSTEMS

13.22 Electrical earthing systems .................................................................................................... 13.8

GROUTING FOR ELECTRICAL AND MECHANICAL INSTALLATIONS

13.23 Grouting for electrical and mechanical installations ............................................................. 13.8

COMPLETION AND PROTECTION OF WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS

13.24 13.25

Completion of work for electrical and mechanical installations .......................................... 13.9 Protection of work for electrical and mechanical installations ........................................... 13.10

TOLERANCES

13.26 13.27

Tolerances: floors of switchgear rooms ............................................................................... Tolerances: lamp standards ....................