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General Specification for Civil Engineering Works …

General Specification for Civil Engineering Works (GS), 2006 Edition Volume 2 of 2 (This Version is Continuously Updated to include Amendments issued) This Electronic File has incorporated the following Amendments:- Rev Issue Date Amendment Incorporated First Issue March 2007 - 1 9 July 2007 Amendment No. 1/2007 2 27 December 2007 Amendment No. 2/2007 3 12 June 2008 Amendment No. 2/2008 4 20 March 2009 Amendment No. 2/2009 5 26 August 2009 Amendment No. 3/2009 6 26 November 2009 Amendment No. 4/2009 7 2 February 2010 Amendment No. 1/2010 8 9 March 2010 Amendment No. 2/2010 9 15 April 2010 Amendment No. 3/2010 10 19 April 2010 Amendment No. 4/2010 11 5 April 2012 Amendment No. 1/2012 12 7 February 2013 Amendment No. 1/2013 13 14 June 2013 Amendment No.

General Specification for Civil Engineering Works (GS), 2006 Edition Volume 2 of 2 content of this electronic file is inconsistent with the

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1 General Specification for Civil Engineering Works (GS), 2006 Edition Volume 2 of 2 (This Version is Continuously Updated to include Amendments issued) This Electronic File has incorporated the following Amendments:- Rev Issue Date Amendment Incorporated First Issue March 2007 - 1 9 July 2007 Amendment No. 1/2007 2 27 December 2007 Amendment No. 2/2007 3 12 June 2008 Amendment No. 2/2008 4 20 March 2009 Amendment No. 2/2009 5 26 August 2009 Amendment No. 3/2009 6 26 November 2009 Amendment No. 4/2009 7 2 February 2010 Amendment No. 1/2010 8 9 March 2010 Amendment No. 2/2010 9 15 April 2010 Amendment No. 3/2010 10 19 April 2010 Amendment No. 4/2010 11 5 April 2012 Amendment No. 1/2012 12 7 February 2013 Amendment No. 1/2013 13 14 June 2013 Amendment No.

2 2/2013 14 24 November 2014 Amendment No. 1/2014 15 28 December 2015 Amendment No. 1/2015 16 30 December 2016 Amendment No. 1/2016 17 21 December 2017 Amendment No. 2/2017 18 19 January 2018 Amendment No. 1/2018 This electronic file is for reference only. When the content of this electronic file is inconsistent with the hard copy of the GS, 2006 Edition and the Amendments issued, the hard copy of the GS, 2006 Edition and the Amendments shall prevail. 2006 Ed it ion The Government of the Hong Kong Special Administrative Region General Specification FOR Civil Engineering Works VOLUME 2 GS (2006 Edition) 2 The Government of the Hong Kong Special Administrative Region The publication General Specification for Civil Engineering Works , 2006 Edition is available from : Publications Sales Unit Information Services Department Room 626, 6/F, North Point Government Offices 333 Java Road, North Point Hong Kong and can be ordered both locally and overseas through the following channels.

3 Visit the online Government Bookstore at Download the order form from the Information Services Department website at and submit the order direct online or by fax to the Information Services Department at 2523 7195 By e-mail at GS (2006 Edition) 3 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.

4 The text relating to "green measures" is printed in green colour in this Edition with a view to making it easier for reader's reference. 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. Amd 1/2007 Sustainability is the prime objective of the 2006 Edition. Two new sections, viz.

5 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. September 2006 GS (2006 Edition) 4 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.

6 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 GS (2006 Edition) Page No. 5 CONTENT OF VOLUME 2 SECTION 13 WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS General General requirements .. Earthworks .. Materials for grout .. Galvanization .. GLOSSARY OF TERMS Concealed electrical conduit system.

7 MATERIALS Electrical conduits and fittings .. Cable ducts and fittings .. Paint for conduit and duct systems .. Fire Cement grout for electrical and mechanical installations .. STORAGE OF MATERIALS Storage of materials for conduit and cable duct systems .. HOLES AND RECESSES FOR ELECTRICAL AND MECHANICAL INSTALLATIONS Holes and recesses for electrical and mechanical installations .. FIRE BARRIERS Fire CONCEALED ELECTRICAL CONDUIT SYSTEMS Construction of conduit systems .. Installation of conduit systems .. Terminations of conduit systems .. Protection of conduit systems .. Cleaning of conduit systems .. CABLE DUCT SYSTEMS Installation of cable duct system .. Protection of cable duct systems .. Cleaning of cable duct GS (2006 Edition) Page No.

8 6 ELECTRICAL EARTHING SYSTEMS Electrical earthing systems .. GROUTING FOR ELECTRICAL AND MECHANICAL INSTALLATIONS Grouting for electrical and mechanical installations .. COMPLETION AND PROTECTION OF WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS Completion of work for electrical and mechanical installations .. Protection of work for electrical and mechanical installations .. TOLERANCES Tolerances: floors of switchgear rooms .. Tolerances: lamp INSPECTION OF WORK FOR ELECTRICAL AND MECHANICAL INSTALLATIONS Inspection of work for electrical and mechanical installations .. TESTING: EARTHING CONTINUITY Testing: earthing continuity .. Compliance criteria: earthing continuity .. TESTING: LOAD TESTS ON BEAMS AND JOISTS Testing: load tests on beams and joists.

9 Compliance criteria: load tests on beams and joists .. SECTION 14 FORMWORK AND FINISHES TO CONCRETE General General requirements .. Concrete carriageways .. Cover spacers .. GLOSSARY OF TERMS Class .. Formed finish .. Formwork .. Permanent formwork .. GS (2006 Edition) Page No. 7 Profiled formwork .. Sealed plywood .. Treated finish .. Unformed finish .. Wood preservative .. MATERIALS Formwork .. Formwork Class of finish .. Release agents .. Formwork ties .. Cement mortar for concrete surfaces .. Surface retarders .. Abrasives .. SUBMISSIONS Particulars of formwork and finishes to concrete and samples of materials .. TRIAL PANELS Trial panels .. Non-compliance: trial panels.

10 Commencement of formwork and concreting .. Changes in materials and methods of construction .. STORAGE OF MATERIALS Storage of formwork .. Storage of release agents and surface retarders .. DESIGN AND CONSTRUCTION OF FALSEWORK AND FORMWORK Design and construction of falsework and formwork .. Construction of formwork .. Construction of formwork for Class F2, F3, F4 and F5 finishes .. Construction of formwork for Class F4 and F5 finishes .. Built-in components .. APPLICATION OF RELEASE AGENTS Application of release agents .. INSPECTION OF FORMWORK AND REINFORCEMENT Inspection of formwork and reinforcement .. REMOVAL OF FALSEWORK AND FORMWORK Times for removal of falsework and formwork .. Removal of falsework and formwork.


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