Standard No.:	GB 50548-2010
English Name:	Code for Investigation and Surveying of 330kV~750kV Overhead Transmission Line
Chinese Name:	330kV～750kV架空输电线路勘测规范
Professional Classification:	GB    National Standard
Issued by:	MOHURD
Issued on:	2010-05-31
Implemented on:	2010-12-1
Status:	superseded
Superseded by:	GB/T 50548-2018
Superseded on:	2019-3-1
Language:	English
File Format:	PDF
Word Count:	53000 words
Price(USD):	210.0
Delivery:	via email in 1 business day

1 General Provisions 1.0.1 This code is formulated to conduct the investigation and surveying of the 330kV~750kV overhead transmission line in accordance with the relevant laws, regulations, guidelines and policies as well as the natural conditions to make it safe and reliable, advanced and applicable, economical and rational and environmental-friendly so as to improve the investment benefits and ensure the line safety and normal operation. 1.0.2 This code is applicable to the feasibility study stage, preliminary design stage, survey of working drawing design stage, geotechnical investigation, engineering hydrological investigation and surveying and engineering meteorological investigation and surveying of the newly-built and renovated 330kV~750kV overhead transmission line. This code is not applicable to the investigation and surveying of the large crossing engineering of overhead transmission line. 1.0.3 For the purpose of the overhead transmission line engineering, the investigation and surveying stage shall be divided corresponding to the design stage and may be divided into the investigation and surveying of feasibility study stage, investigation and surveying of preliminary design stage and investigation and surveying of working drawing design stage. 1.0.4 The measuring instrument and equipment used in the investigation and surveying of the engineering must be verified periodically according to the national measurement methods; the professional application software shall be authenticated or verified. 1.0.5 The original record of the engineering investigation and surveying must be true and accurate; the collected reference shall be verified. 1.0.6 This code specifies the basic technical requirements for investigation and surveying of 330kV~750kV overhead transmission line. If this code conflicts with the requirements of the national laws and administrative regulations, the national laws and administrative regulations shall apply. 1.0.7 For the 330kV~750kV overhead transmission line, the engineering survey, geotechnical investigation, engineering hydrological investigation and surveying and engineering meteorological investigation and surveying shall not only comply with this code but those in the current relevant standards of the nation. 2 Terms and Symbols 2.1 Terms 2.1.1 Large crossing The strain section that gives special consideration on the wire selection or tower design needs owing to larger distance between two poles (above 1000m) or higher tower (above 100m) when the line crosses the navigation river, lake or strait and has a strong impact on navigation or is especially difficult in repair in case of fault. 2.1.2 Straight line location survey The survey in which stakes of straight line are provided in the direction connecting the two corners for the works of plane and section, cross and location survey. 2.1.3 Linearity The extent to which the stake of straight line deviates from the theoretical straight line between two turning point stakes when both are projected on the same plane. 2.1.4 The stake of straight line The control stake position which is set in the connecting line of two corners for the follow-up survey work like plan and section, cross and positioning. 2.1.5 Directional stake The stakes on the front and rear straight lines and nearby the front and rear corners in the location of line or positioning for guiding the straight line direction. 2.1.6 Distance between two stakes The horizontal distance between two adjacent stakes of straight line or the stake of straight line and adjacent turning point stake. 2.1.7 Difference of elevation between two stakes

1 General Provisions 2 Terms and Symbols 2.1 Terms 2.2 Symbols 3 Basical Requirements 3.1 Survey 3.2 Geotechnical Investigation 3.3 Engineering Hydrological Investigation and Surveying 3.4 Engineering Meteorological Investigation and Surveying 4 Survey of Feasibility Study Stage 4.1 General Requirements 4.2 Office Work 4.3 Field Work 4.4 Finished Products Submitted 5 Survey of Preliminary Design Stage 5.1 General Requirements 5.2 Route Selection Plan Indoor 5.3 Route Selection Plan Outdoor 5.4 Aerial Photography 5.5 Establishment of GPS Control Network and GPS Field Control Point 5.6 Photo Annotation 5.7 Aerial Photo Scanning 5.8 Acrotriangulation 5.9 Establishment of 3D Digital Route Model 5.10 Optimization of 3-D Digital Model Route Model 5.11 Finished Products Submitted 6 Survey of Working Drawing Design Stage 6.1 General Requirements 6.2 Route Selection Survey 6.3 Straight Line Location Survey 6.4 Survey of Distance Between Two Stakes and Different of Elevation 6.5 Plane and Elevation Connection Survey 6.6 Plane and Section Survey 6.7 Cross Survey 6.8 Positioning and Test Survey 6.9 Section Survey of Tower Foundation and Topograohic Survey of Tower Position 6.10 House Distribution Survey 6.11 Tower Coordinate Survey 6.12 Forest Distribution Survey 6.13 Grounding Electrode Positioning Survey 6.14 Finished Product Submitted 7 Geotechnical Investigation of Feasibility Study Stage 8 Geotechnical Investigation of Preliminary Design Stage 9 Geotechnical Investigation of Working Drawing Design Stage 9.1 General Requirements 9.2 Investigation for Plain and River Valley 9.3 Investigation for Mountain and Hill 10 Method of Geotechnical Investigation 10.1 Engineering Ecological Survey 10.2 Remote Sensing 10.3 Geophysical Exploration 10.4 Exploration and Testing 11 Geotechnical Investigation for Special Lithology 11.1 Collapsible Loess 11.2 Frozen Soil 11.3 Soft Soil 11.4 Swelling Soil and Rock 11.5 Red Clay 11.6 Filled Ground 11.7 Weathered Rock and Residual Soil 11.8 Saline Soil 11.9 Mixed Soil 12 Geotechnical Investigation for Special Geologic Condition 12.1 Karst and Cave 12.2 Landslipe 12.3 Avalanche and Collapse Heap 12.4 Gully 12.5 Debris Flow 12.6 Seismic Liquefaction 12.7 Mined out Space 13 Prototype Test 13.1 General Provisions 13.2 Prototype Test for Pile Foundation 13.3 Anchored Foundation and Shallow Foundation Test 13.4 Result Reporting for Prototype Test 14 Foundation Pit Proving 15 Result of Geotechnical Investigation 15.1 General Provisions 15.2 Feasibility Study Stage 15.3 Preliminary Design Stage 15.4 Working Drawing Design Stage 16 Engineering Hydrological Investigation and Surveying of Feasibility Study Stage 16.1 General Requirements 16.2 Contents and Technical Requirements 16.3 Outcome 17 Engineering Hydrological Investigation and Surveying of Preliminary Design Stage 17.1 General Requirements 17.2 Contents and Technical Requirements 17.3 Outcome 18 Engineering Hydrological Investigation and Surveying of Working Drawing Design Stage 18.1 General Requirements 18.2 Contents and Technical Requirements 18.3 Outcome 19 Hydrological Investigation and Surveying 19.1 General Requirements 19.2 Impact of Human Activity 19.3 Flood and Waterlogging 19.4 Fluvial Process 19.5 Ice and River Float 19.6 Specific Areas 19.7 Hydrological Survey 20 Hydrological Analysis and Calculation 20.1 General Requirements 20.2 Natural River Design Flood 20.3 Design Flood about the Upstream and Downstream of the Reservoir 20.4 Dike-breach and Dam-break Design Flood 20.5 Ice Flood 20.6 Special Area Design Flood 20.7 The Design Flood Stage 20.8 The Design Flow Rate 20.9 The Hydrological Analysis about the Coastal and River Mouth Area 21 The Evolution Analysis of the River (Sea) Bed 21.1 General Requirements 21.2 Analysis of the Evolution of the River Bed 21.3 Analysis of the Evolution of the Seabed 22 Engineering Meteorological Investigation and Surveying of Feasibility Study Stage 22.1 General Requirements 22.2 Contents and Technical Requirements 22.3 Outcome 23 Engineering Hydrological Investigation and Surveying of Preliminary Design Stage 23.1 General Requirements 23.2 Contents and Technical Requirements 23.3 Outcome 24 Engineering Meteorological Investigation and Surveying of Working Drawing Design Stage 24.1 General Requirements 24.2 Contents and Technical Requirements 24.3 Outcome 25 Meteorological Survey 25.1 General Requirements 25.2 Strong Wind 25.3 Wire Ice Covering 25.4 Predominant Wind Direction 25.5 Meteorology Special-purpose Station and Observation 26 Meteorological Analysis and Calculation Appendix A Planemetic Map in Crowded Area Appendix B Relative Position Samples of Communication Line Risk Influence Appendix C Plan Legend for Substation or Power Plant Lines In and Out Appendix D Survey Stake Standard and Embedding Size Appendix E Relative Position Plan Samples of Parallel Proximity Line Appendix F Plan and Section Samples of Transmission Line Appendix G Symbol List of Planemetric and Section Plan Appendix H Intersection and Cross Section Plan Appendix J Intersection and Cross Planemetric Plan Appendix K Tower Foundation Section Plan Appendix L Tower Position Topographic Map Appendix M House Distribution Map Appendix N The Schedule of Hydrological Condition about Pole Tower Appendix P The Calculation about the Design Wind Speed Appendix Q The Calculation about the Design Wire Ice Covering Thickness Explanation of Wording in This Code List of Quoted Standards