1 General rules
1.0.1 For the guidance of highway bridge sorghum maintenance work, to maintain cross-sea bridges are often in good technical condition, the development of this specification.
1.0.2 This specification applies to the maintenance of highway span bridges and public-railway, public-track span bridges highway engineering part.
Article description cross-sea bridges including highway, railroad, rail cross-sea bridges and public-rail, public-track dual-use cross-sea bridges. The implementation of highway industry design and construction standards for bridges across the sea apply to this specification.
1.0.3 Highway cross-sea bridge maintenance should be safe. Durable, applicable to the life of the goal. Implementation of the concept of whole life maintenance, follow the work of prevention-oriented approach, and actively and steadily apply new materials, new equipment, new technologies, new techniques.
Article Description
Cross-sea bridges in typhoons, earthquakes, waves, currents, storm surges, tsunamis, heavy rains, scouring, high humidity, high salt, high corrosion and other kinds of criyon realm, with scale into. The route is long, social impact, complex structure, large capital investment, safety and durability problems unjust out, etc., so the difficulty of cross-sea comb beam maintenance is greater than the general bridge, so the concept of whole life maintenance, preventive maintenance policy, as well as the application of the four new technology requirements.
1.0.4 Highway bridge maintenance shall include inspection and monitoring, assessment and countermeasures, maintenance planning, maintenance engineering design, maintenance operations and maintenance technology management.
Article Description
This specification in the "highway bridge maintenance specification" (JTG 5120-2021) and other specifications on the basis of inspection and monitoring, assessment and countermeasures, maintenance planning, maintenance engineering design, maintenance operations and other aspects of cross-sea bridges to put forward further requirements, and "highway bridge maintenance specification" (JTG 5120-2021) and other specifications of the same content will not be repeated. ) and other specifications of the same content will not be repeated.
1.0.5 Highway bridge maintenance operations, prevention, repair, emergency maintenance engineering design and construction should be in line with the provisions of this specification, special maintenance engineering design and construction can be based on specific project characteristics with reference to the implementation of this specification.
2 Terminology
2.0.1 sea-crossing bridgesea-crossing bridge
In the marine environment, across the bay, straits, deep sea, the mouth of the sea or other marine waters of the bridge.
2.0.2 sea-crossing bridge sorghum maintenance inspection units inspection units of sea-crossing bridge
Mainly according to the bridge structure form, where the part, use function and technical condition, the sea-crossing bridge is divided into different mileage paragraphs to facilitate the inspection assessment.
2.0.3 Centralized maintenance
Centralized personnel, equipment and materials, taking into account the timing of maintenance and traffic organization and other factors, the original long-term, scattered maintenance operations, in a relatively centralized time or a number of sections, all kinds of maintenance operations will be implemented in a unified way of maintenance operations.
2.0.4 Exposure test station field exposure station
For the study of structures, materials in the actual environment of corrosion behavior and the construction of outdoor testing facilities.
3 basic provisions
3.0.1 Cross-sea bridge maintenance should be combined with the bridge environment, use requirements, bridge structure and materials and other characteristics, the preparation of targeted maintenance planning and manuals to carry out maintenance work.
3.0.2 Cross-sea bridge maintenance should be based on the importance of different parts, accessibility, inspectability, repairability, replaceability classification, take different maintenance measures, the implementation of classification inspection, evaluation and maintenance. Classification standards should be implemented in accordance with the provisions of Table 3.0.2.
4 inspection and monitoring
4.1 - general provisions
4.1.1 cross-sea bridge sorghum should be based on the form of structure, and combined with the combination of span, service environment and technical conditions reasonably divided into maintenance inspection unit.
Article Description
The amount of cross-sea bridge is generally larger, the structure of various forms, the service environment there is a certain degree of variability, its damage characteristics and deterioration laws are different. When carrying out specific work, the structure of the ponderous beam form, and combined with its span combination, service environment and bridge technology, reasonable division of maintenance inspection unit, help to improve the target of inspection and assessment work, improve maintenance efficiency.
4.1.2 Cross-sea bridge sorghum should be in accordance with the provisions of the current "Highway Bridge Maintenance Code TTG 5120", to determine the maintenance inspection unit maintenance inspection level, to carry out inspection and evaluation work.
4.1.3 cross-sea bridge inspection shall be divided into initial inspection, daily inspection, regular inspection, periodic inspection and special inspection. Each type of inspection shall be in accordance with the current "Highway Bridge Maintenance Code" (JTG 5120), in addition to the implementation of the provisions of this chapter shall also comply with the provisions. One
4.1.4 for each maintenance inspection unit in the complex structure, the number of large scale components, when A, B class components technical condition level for 1, 2, c, D, E class components technical condition level for 1 ~ 3, can meet the existing specifications based on the use of circular inspection mode to carry out regular inspection and periodic inspection work. When the A, B parts technical condition level reaches 3 ~ 5, C, D, E parts technical condition level reaches 4 ~ 5, should cancel the cycle inspection mode, a comprehensive inspection, while the following provisions should be met:
1 cycle inspection method should be combined with the bridge maintenance manual or planning, according to structural mechanical characteristics, service life, structure form, deterioration characteristics, operating conditions and assessment results and other factors, according to a comprehensive, systematic, scientific and orderly principle to develop inspection plans, clear inspection parts and requirements.
2 The frequency and timing of regular inspection and periodic inspection carried out by means of cyclic inspection shall conform to the relevant provisions of the current Highway Bridge Maintenance Code (JTG 5120), and the inspection work shall be completed according to the inspection parts and requirements determined by the inspection plan.
5 Assessment and countermeasures
5.1 - General provisions
5.1.1 Cross-sea bridges should be divided into maintenance inspection units to carry out bridge assessment and develop maintenance countermeasures.
5.1.2 The assessment of the bridge shall include technical condition assessment and adaptability assessment.
5.1.3 For bridges with structural monitoring system installed, the bridge assessment and countermeasures shall fully apply the data obtained from monitoring and make a comprehensive analysis of the structural condition in combination with inspection data.
Article Description
Monitoring data reflects the real state of the operating bridge, data analysis can make an objective assessment of the performance and safety of the iterative bridge, and therefore can provide a reliable data support for the maintenance of countermeasures, analysis of structural performance parameters monitoring data for the development of the bridge preventive maintenance plan to provide evidence. Bridge structural safety and durability monitoring data can be used to develop bridge repair and maintenance, special maintenance plans to provide a basis; extreme premature eating, earthquakes, ship collisions and other abnormal conditions of the bridge safety monitoring data can provide the basis for disaster prevention and emergency maintenance.
5.1.4 cross-sea bridge sorghum to develop maintenance countermeasures, should follow to strengthen the daily maintenance, the initiative to carry out preventive maintenance, effective implementation of repair and maintenance waki timely emergency maintenance principles.
5.2 Bridge assessment
5.2.1 Cross-sea bridge technical condition assessment should be in line with the current "highway bridge technical condition assessment standards" ( JTG/TH21) requirements.
5.2.2 Cross-sea bridge technical condition assessment, the technical condition of the appurtenant facilities should be assessed separately, the appurtenant parts assessment standards can be referred to Appendix E of this specification.
5.2.3 After the completion of the special inspection, the suitability of the bridge shall be evaluated according to the existing technical data on the durability, load-bearing capacity, capacity and disaster resistance of the bridge.
6 Maintenance Planning and Manual
6.1 - General Provisions
6.1.1 The maintenance plan shall be prepared in accordance with the whole life cycle concept and the principle of lowest economic, environmental and social costs, while ensuring that the bridge performance meets the requirements.
6.1.2 The planning period for medium and long-term maintenance planning of cross-harbour bridges should be 20-30 years f the planning period for short-term planning should be 5-10 years.
6.1.3 Cross-sea bridge maintenance planning and maintenance manual before the preparation, the more the current situation of the bridge to carry out a detailed survey and analysis, and in the preliminary inspection and assessment based on the development.
6.1.4 The maintenance manual of cross-sea bridges should be prepared with reference to the maintenance plan, according to the structural characteristics of the bridge and the operating environment, combined with the maintenance needs.
6.1.5 The maintenance work of cross-sea bridges shall be carried out under the guidance of maintenance planning, detailed maintenance work content, and reasonable arrangement of maintenance funds.
6.2 Maintenance Planning
6.2.1 Maintenance planning should include the following contents:
1 cross-sea bridge engineering background, basic conditions and operation and maintenance of the characteristics, priorities and difficulties;
2 maintenance objectives and indicators;
3 maintenance planning basis for the preparation;
4 maintenance system and maintenance team construction;
5 Analysis and prediction of traffic flow of cross-harbor bridges during the planning period;
6 Risk assessment and emergency management of cross-harbor bridges;
7 Maintenance plan for the main structure of cross-harbour bridges during the planning period; 8Maintenance and upgrading of the mechanical and electrical system of cross-harbour bridges during the planning period;
9 Upgrading of the management and maintenance auxiliary system of cross-harbour bridges during the planning period;
1 General
2 Terminology
3 basic provisions
4 inspection and monitoring
5 Assessment and countermeasures
6 Maintenance Planning and Manual
7 Maintenance plan for the main structure of cross-harbour bridges during the planning period;
8 Conservation operations
9 Technical Management
Appendix A Construction Requirements for Exposure Test Stations for Cross-Harbour Bridges
Appendix B Bridge Initial Inspection Record Form
Appendix C Bridge Frequent Inspection Record Form
Appendix D Bridge Periodic Inspection Record Form
Appendix E Technical Condition Assessment Criteria for Cross-Harbour Bridge Appurtenances
Appendix F Bridge cleaning requirements for cross-harbour bridges
Appendix G Maintenance Requirements for Bridge Maintenance Vehicles
Appendix H Bridge dehumidification system maintenance requirements
Explanation of terms used in this specification
