2. Hot-rolled wire rods for cold-drawn smooth steel bars should adopt high-speed wire rods that meet the current national standards GB/T 70 1.
3 the diameter of cold-drawn smooth steel bar is 4 ~ 12 mm, and the surface of steel bar should comply with the corresponding provisions of the current national standard "cold rolled ribbed steel bar" GB 13788. The mechanical properties and technological properties of steel bars shall comply with the provisions in Table E.0.3.
4 For each batch of welded mesh, one mesh should be randomly selected, and two samples should be taken from the longitudinal and transverse reinforcement, and the strength (including elongation) and bending tests should be carried out respectively. Each sample contains at least one welding point, and the length of the sample should be enough to ensure that the distance between the clamps is not less than 20 times the diameter of the sample and not less than 180MM. For reinforcement, a non-tensile reinforcement shall be cut off at a position about 20MM from the cross weld (Figure E.0.4).
If the tensile and bending test results of welded mesh are unqualified, double samples should be taken from the same type of mesh of this batch of welded mesh for inspection of unqualified items. Only when the reinspection results are all qualified can the batch of welding nets be judged to be qualified.
5 A piece of mesh is randomly selected from each batch of welding nets, and three shear samples are randomly intercepted on the same unstretched steel bar (usually fine steel bar) (Figure E.0.5). When steel bars are assembled, one untensioned steel bar shall be cut off at the intersection solder joint, but the solder joint of the tensioned steel bar shall not be damaged.
The shear strength (unit "n") of welded joints of welded steel mesh shall not be less than 0.3 times the specified yield force of tensile steel bars of the sample. The shear test results shall be calculated as the average of three samples.
If the average shear test result of welded mesh is unqualified, double samples shall be taken for reinspection. When the average test results are qualified, the batch of welded nets can be judged as qualified.
Note: When the two-way plate welding net is laid in a double-layer way (only refer to the situation in Figure 5.2. 10A), the shear requirement of the solder joint can be multiplied by the coefficient of 0.8 according to the specified value in this article.
Technical standard specification for subgrade engineering construction
The first chapter subgrade construction preparation
Chapter II Construction of Fill Embankment
Chapter III Excavation Subgrade Construction
Chapter IV Subgrade Compaction Construction Technology
Chapter V Subgrade Construction Technology in Winter and Rainy Season
Chapter VI Subgrade Construction in Special Areas
Chapter VII Construction Technology of Soft Soil Foundation
Chapter VIII Subgrade Drainage Construction Technology
Chapter IX Construction Technology of Subgrade Protection and Reinforcement Project
Attachment: Common Data of Highway Subgrade Engineering Construction
Technical standard specification for bridge and culvert engineering construction
Chapter I Overview of Bridge Construction
Chapter II Construction Survey of Bridges and Culverts
Chapter III Bridge Foundation Construction Technology
Chapter IV Construction Technology of Bridge Pier and Abutment
Chapter V Construction Technology of Concrete Bridges
Chapter VI Arch Bridge Construction Technology
Chapter VII Construction Technology of Cable-stayed Bridge
Chapter VIII Construction Technology of Steel Bridge
Chapter 9 Construction Technology of Suspension Bridge
Chapter 10 Overview of Culvert Construction
Attachment: Technical Specification for Construction of Highway Bridges and Culverts (Excerpt)
Technical standard specification for highway bridge and culvert maintenance construction
The first chapter is an overview.
Chapter II Construction Technology of Subgrade Maintenance Project
Chapter III Construction Technology of Pavement Maintenance Project
Chapter IV Construction Technology of Bridge Maintenance Project
Chapter V Construction Technology of Tunnel Maintenance Project
Chapter VI Treatment of Main Diseases in Tunnel
Chapter VII Construction Technology of Traffic Facilities Maintenance Project
Chapter VIII Flood Control, Sand Prevention, Ice Prevention and Snow Prevention of Roads
Chapter IX Production and Management of Road Grades
Attachment: Technical Specification for Highway Maintenance (Excerpt)
Technical standard specification for tunnel engineering construction
Chapter I Tunnel Structure
Chapter II Tunnel Construction Preparation and Construction Survey
Chapter III Shield Tunnel Construction Technology
Chapter IV Construction Technology of Immersed Tube Tunnel
Chapter V Construction Technology of Highway Tunnel in Mountainous Area
Chapter VI Construction Technology of NATM Tunnel
Chapter VII Tunnel Construction Technology in Bad and Special Geological Areas
Chapter VIII Construction Technology of Soft Soil and Underwater Highway Tunnel
Chapter IX Construction Organization Design and Management of Highway Tunnel
Chapter 10 Common Forms of Tunnel Construction
Attachment: Technical Specification for Highway Tunnel Construction (Excerpt)
Standard specification for quality inspection and evaluation of building engineering
Chapter I Inspection, Evaluation and Acceptance of Highway Engineering Quality
Chapter II Inspection, Evaluation and Acceptance of Construction Quality of Subgrade Engineering
Chapter III Inspection, Evaluation and Acceptance of Pavement Construction Quality
Chapter IV Inspection, Evaluation and Acceptance of Bridge Engineering Quality
Chapter V Inspection, Evaluation and Acceptance of Tunnel Construction Quality
Attachment: 1 Standard for quality inspection and evaluation of highway engineering
2. Contents and basis of bridge and culvert engineering test.
3. Municipal Road Engineering Quality Inspection and Evaluation Standard
Technical specification for application of culvert materials in road and bridge engineering
Chapter I Quality Requirements of Commonly Used Materials
Chapter II Application of Steel
Chapter III Application of Cement
Chapter IV Application of Asphalt Materials
Chapter V Application of Wood
Chapter VI Local Materials
Chapter VII Application of Hardware Products
Chapter VIII Application of Blasting Equipment
Chapter 9 Application of Electrical Equipment
Chapter 10 Application of Light Chemical Products
Chapter II Application of XI Special Materials
Technical specification for safety production of highway bridge and culvert construction
Chapter I Safety Management of Highway Bridge and Culvert Engineering Construction
Chapter II Safety Technology in Preparation of Highway Engineering Construction
Chapter III Safety Points of Subgrade Engineering Construction
Chapter IV Safety Points of Pavement Engineering
Chapter V Safety Points of Bridge and Culvert Engineering Construction
Chapter VI Key Points of Tunnel Construction Safety
Chapter VII Safety Points of Other Related Construction Operations
Chapter VIII Occupational Safety and Health Protection Articles
Technical specification for construction survey of highway bridge and culvert engineering
Chapter I Site Investigation of Highway Bridge and Culvert Engineering
Chapter II Selection and Alignment of Construction Lines for Highway Bridges and Culverts
Chapter III Environmental Impact and Evaluation of Highway Bridge and Culvert Engineering
The fourth chapter highway bridge construction control survey
The fifth chapter is the basic method of highway bridge and culvert engineering lofting.
Chapter VI Introduction of New Measuring Instruments and Technologies
Appendix: Specification for Highway Survey
Mechanized construction technology of engineering bridge and culvert engineering
Chapter I Equipment Decision-making of Mechanized Construction Enterprises
Chapter II Mechanized Construction Technology of Subgrade Engineering
Chapter III Mechanized Construction Technology of Pavement Engineering
Chapter IV Mechanized Construction Technology of Bridges and Culverts
Chapter V Selection and Matching of Construction Machinery
Chapter VI Management of Mechanized Construction Process
Chapter VII Mechanical Management of Mechanized Construction
Chapter VIII Testing Instruments and Equipment for Highway Bridge and Culvert Construction Site
Construction technology of highway bridge and culvert accessory project
Chapter I Construction Technology of Highway Greening Project
Chapter II Construction Technology of Road Traffic Safety Facilities
Chapter III Construction Technology of Other Road Accessory Projects
Chapter IV Construction Technology of Bridge Accessory Works
The fifth chapter tunnel ancillary facilities engineering construction technology
Chapter VI Prevention and Control of Common Faults of Highway Bridge Ancillary Facilities
Chapter VII Maintenance Technology of Bridge Subsidiary Structure
Technical standard specification for pavement engineering construction
Chapter I Pavement Base and Subbase
Chapter II Asphalt Pavement Construction Technology
Chapter III Construction Technology of Cement Concrete Pavement
Chapter IV Construction Technology of Block Pavement
The fifth chapter pavement drainage engineering construction technology
Attachment: Technical Specification for Construction of Highway Asphalt Pavement
Standard specification for prevention and control of common diseases in highway bridge and culvert construction
Chapter I Prevention and Treatment of Common Products and Diseases
Chapter II Common Quality Problems and Prevention of Subgrade Engineering.
Chapter III Common Quality Problems and Prevention of Pavement Engineering.
Chapter IV Common Quality Defects of Bridge and Culvert Engineering and Prevention
Chapter 5 Common quality defects of tunnel engineering and their prevention.
Attachment: Technical Standards for Highway Engineering