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GB 50206-2012: Code for acceptance of construction quality of timber structures Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 50206: Historical versions
GB 50206-2012: Code for acceptance of construction quality of timber structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50206-2012NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC P GB 50206-2012 Code for Acceptance of Construction Quality of Timber Structures Issued on. MARCH 30, 2012 Implemented on. AUGUST 1, 2012 Issued by. Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. National Standard of the People's Republic of China Code for Acceptance of Construction Quality of Timber Structures Chief Development Department. Ministry of Housing and Urban-Rural Development of the People's Republic of China Approval Department. Ministry of Housing and Urban-Rural Development of the People's Republic of China Implementation Date. August 1, 2012 2012 Beijing Table of ContentsForeword... 4 1 General Provisions... 8 2 Terms... 9 3 Basic Requirements... 14 4 Rough Sawn and Round Timber Structure... 17 4.1 General Requirements... 17 4.2 Dominant Items... 17 4.3 General Items... 22 5 Glued-laminated Timber Structure... 25 5.1 General Requirements... 25 5.2 Dominant Items... 25 5.3 General Items... 27 6 Light Wood Frame Construction... 30 6.1 General Requirements... 30 6.2 Dominant Items... 30 6.3 General Items... 33 7 Protection of Timber Structure... 37 7.1 General Requirements... 37 7.2 Dominant Items... 37 7.3 General Items... 41 8 Acceptance of Sub-subsection Project of Timber Structure... 43 Appendix A Timber Strength Grade Inspection Method... 44 Appendix B Standard for Materials of Rough Sawn Timber, Log and Panel 45 Appendix C Inspection Method for Moisture Content of Timber... 48 Appendix D Bending Test of Steel Nail... 50 Appendix E Allowable Error for Manufacture and Installation of Wood Structure... 53 Appendix F Test Method for Mechanical Property of Bending Wood Members ... 58 Appendix G Inspection Method for Material Grade of Dimension Lumber 62 Appendix H Mechanical Properties Index of Wood-based Structural Panel 71 Appendix J Requirements for Nailed Connection of Light Wood Frame Construction Designed Based on Structure... 73 Appendix K Requirements for Retention and Penetration of Various Protective-treated Wood Members... 75 Explanation of Wording in this Code... 79 List of Quoted Standards... 80 Code for Acceptance of Construction Quality of Timber Structures1 General Provisions1.0.1 This code is formulated with a view to strengthening the quality management of construction work, unifying the construction quality acceptance of timber work and guaranteeing the project quality. 1.0.2 This code is applicable to the construction quality acceptance for timber structure works like rough sawn and round timber structure, glued-laminated timber structure and light wood frame construction. 1.0.3 The construction quality acceptance of timber structure work shall be based on engineering design document. The requirements of construction quality acceptance in design document and engineering contracting contract shall not be lower than those specified in this code. 1.0.4 This code shall be used together with the current national standard "Unified Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300). 1.0.5 The construction quality acceptance for timber structure work shall not only meet the requirements in this code, but also comply with those specified in the current relevant ones of the nation.2 Terms2.0.1 Rough sawn and round timber structure Load bearing member structure manufactured from rough sawn timber (including slab) or log. 2.0.2 Glued-laminated timber structure Load bearing member structure manufactured from glued-laminated timber. 2.0.3 Light wood frame construction Wood structure composed of shear wall and tabula (floor system and roof) manufactured from dimension lumber and wood-based structural panel through nailed connection, generally used for 1~3F buildings. 2.0.4 Dimension lumber A kind of wood product made through drying, polishing, grading and stamping on a series of log sawn timber with section width and height within certain limits.3 Basic Requirements3.0.1 The constructor of timber structure work shall have corresponding qualification, complete quality management system, quality inspection system and overall quality assessment system. The quality management of construction site may be inspected and recorded according to the relevant requirements of the current national standard "Unified Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300). 3.0.2 Sub-subsection project of timber structure shall be composed of two subitem projects. namely manufacture & installation of timber structure and protection of timber structure. Acceptance for sub-subsection project is carried out after that for two subitem projects. 3.0.3 Inspection lot shall be respectively classified according to the quality control for physical and mechanical performance of material, wood product, member and accessory and the quality control of manufacture and installation of structural member. 3.0.4 For the protection work of wood structures, the wood preservation construction quality shall be accepted according to different use environment as specified in Table4 Rough Sawn and Round Timber Structure4.1 General Requirements 4.2 Dominant Items 4.2.1 The type, structural arrangement and member size of rough sawn and round timber structure shall meet the requirements of the design document. Inspection quantity. total number of inspection lot. Inspection method. comparison between physical object and construction design drawing; measurement. 4.3 General Items 4.3.1 The allowable deviation for the manufacturing of various log and rough sawn timber members shall not exceed the requirements of Table E.0.1 in this code. Inspection quantity. total number of inspection lot. Inspection method. see Table E.0.1 in this code. 4.3.3 The bolt quantity, arrangement mode, spacing, edge distance and end distance of bolted connection (including tension joint) shall not only meet the requirements of the design document, but also meet the following requirements. 4.3.6 The allowable deviation for installation of timber truss, beam and column shall not exceed the requirements of Table E.0.2 in this code. 4.3.7 The allowable deviation for installation of roof timber frame shall not exceed the requirements of Table E.0.3 in this code. 4.3.8 The integrity of roof structure support system shall meet those specified in design document.5 Glued-laminated Timber Structure5.1 General Requirements 5.1.1 This chapter is applicable to the acceptance of construction quality of timber structure with main load bearing member manufactured and installed with glued-laminated timber. 5.2 Dominant Items 5.2.1 The structure type, structural arrangement and member section size shall meet the requirements of the design document. Inspection quantity. total number of inspection lot. Inspection method. comparison between physical object and design document; measurement. 5.2.5 The average moisture content of glued-laminated timber member shall not be greater than 15%, the difference of moisture content of each lamination of the same member shall not be greater than 5%. 5.2.6 The quality of steel, electrode, bolt and nut shall respectively meet the requirements of Articles 4.2.6~4.2.8 in this code. 5.3 General Items 5.3.1 The construction and appearance of glued-laminated timber shall meet the following requirements. 5.3.5 The deviation for installation of glued-laminated timber structure shall not exceed the requirements of Table E.0.2 in this code.6 Light Wood Frame Construction6.1 General Requirements 6.1.1 This chapter is applicable to the acceptance of construction quality of timber structure manufactured and installed with main materials of dimension lumber and wood-based structural panel. 6.2 Dominant Items 6.2.1 The arrangement and anti-overturning measures of load bearing wall (including shear wall), column, floor system and roof of light wood frame construction, and anti-disengaging measures of roof shall meet the requirements of design document. 6.2.4 The tree species, material grade and specification of dimension lumber adopted for each member as well as type and specification of structural sheathing for light wood frame construction shall meet the requirements of design document. 6.2.6 Wood-based structural panels shall be provided with product quality certificate and product stamp, those used as floor plate and roof plate shall be provided with inspection report for dry/wet concentrated load, uniformly distributed load and impact load of this product lot; their performance shall not be lower than those specified in Appendix H of this code. 6.3 General Items 6.3.1 The following items of load bearing wall (including shear wall) shall meet the requirements of design document and shall not be lower than relevant structural requirements in current national standard "Code for Design of Timber Structures" (GB 50005). 6.3.5 Manufacture and installation deviation of various members of light wood frame construction shall not be greater than those specified in Table E.0.4 of this code. 6.3.6 Insulation measures of light wood frame construction and the arrangement of vapor barrier shall meet the requirements of design document.7 Protection of Timber Structure7.1 General Requirements 7.1.1 This chapter is applicable to the acceptance of construction quality of corrosion, insect and fire prevention of timber structure. 7.1.5 Inspection lot of wood structure protection project may be divided according to corresponding inspection lot of rough sawn and round timber structure, glued-laminated timber structure or light wood frame construction in Chapters 4~6. 7.2 Dominant Items 7.2.1 The utilized corrosion-proof, insect-proof, fire prevention and flame retardants shall be in accordance with the service environment type and fire resistance rating of wood member (including glued-laminated timber member) indicated in the design document, and shall be provided with certification documents for quality certificate. 7.2.2 Penetration evidential testing shall be carried out for each product lot of wood member approaching the construction site after preservative treatment of chemical agent, the penetration shall meet those specified in Appendix K of this code. Inspection quantity. randomly take 5~10 pieces of members from each inspection lot and drill 20 (oil-based agent) or 48 (water-based agent) core samples uniformly. Inspection method. current national standard "Standard for Methods Testing of Timber Structures" (GB/T 50329). 7.2.9 The laying of all kinds of pipeline burying or crossing the timber structure shall meet the following requirements. 7.3 General Items 7.3.1 The wood member after protective treatment shall be repaired where the protective layer is damaged or protective layer defect is caused by local processing. Inspection quantity. total number of inspection lot.8 Acceptance of Sub-subsection Project of Timber Structure8.0.1 The procedure and composite for acceptance of construction quality of sub-subsection project of timber structure shall meet the relevant requirements of current national standard "Unified Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300). 8.0.2 Quality acceptance of inspection lot and sub-item project of timber structure shall meet the following requirements. 8.0.3 Quality acceptance of sub-subsection project of timber structure shall meet the following requirements. 8.0.4 Where the construction quality of timber structures is rejected, it shall be treated according to current national standard "Unified Standard for Constructional Quality Acceptance of Building Engineering" (GB 50300). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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