EN 22 TCN 306 2003 TECHNICAL STANDARD FOR ROAD MAINTENANCE AND REPAIR

22 TCN 306 2003: TECHNICAL STANDARD FOR ROAD MAINTENANCE AND REPAIR, Issued under Decision No 15272003QDBGTVT dated 28 May 2003 of the Minister of Transport. Tiêu chuẩn ngành 22TCN 306:2003 về tiêu chuẩn kỹ thuật bảo dưỡng thường xuyên đường bộ do Bộ Giao thông vận tải ban hành

SOCIALIST REPUBLIC OF VIETNAM TECHNICAL STANDARD FOR ROAD MAINTENANCE AND REPAIR 22 TCN 306 - 03 EFFECTIVE SINCE 13 June 2003 MOT Issued under Decision No 1527/2003/QD-BGTVT dated 28 May 2003 of the Minister of Transport CHAPTER I: GENERAL PROVISIONS 1.1 Scope of Application - Technical Standard for regular road maintenance shall be applied uniquely throughout the country for the route managed by the Municipal Government and local government - This standard does not apply to periodic maintenance work and unscheduled repairs - For regular maintenance for bridges with a total length of over 300 meters, separate regulation shall be applied 1.2 Legal documents Provisions in this standard to specify requirements for regular road maintenance are given in following legal documents: - Law No 26/2001/QH10 of June 29, 2001, on Land road traffic (Article 39, 41, 43, 44, 47 of Chapter III; Article 68, 69 of Chapter VII) - Decree 167/1999/ND-CP dated 26 Nov 1999 of Government on road management operation - Decree No 172/1999/ND-CP of December 7, 1999, detailing the implementation of the ordinance on protection of traffic works with regard to land road traffic works - Joint Circular 01/2001/TTLT/BTC-BGTVT dated 05 Jan 2001, Guiding the management, payment and settlement of economic non-business funds for road management and maintenance - Prevailing technical standards on design, construction and acceptance for road traffic infrastructure 1.3 Terms and abbreviation definition - Regular road maintenance: Includes management and regular maintenance in order to protect, prevent damage and promptly repair minor damages This work is carried out regularly and continuously throughout the year, on the entire route to ensure smooth and safe traffic on road - RM: abbreviation of “regular maintenance” - CC: abbreviation of “cement concrete” - AC: abbreviation of “asphalt concrete” - RC: abbreviation of “reinforced concrete” - PRC: abbreviation of “prestressed reinforced concrete” - CAC: abbreviation of “cold asphalt concrete” - RTI: abbreviation of “road traffic inspectorate” - PR: abbreviation of “periodic repair” - IR: abbreviation of “irregular repair” - M&R: abbreviation of “road management and repair” - TT: abbreviation of “traffic transportation” - PT: abbreviation of “public transportaton” - TF: abbreviation of “traffic safety” - TA: abbreviation of “traffic accident” - RM: abbreviation of “road management” - VR: abbreviation of “Vietnam road” - ROW: abbreviation of “right-of-way” - LCS: abbreviation of “land clearing stake” CHAPTERII: 2.1 MANAGEMENT Document control Timely archive and supplement documents and materials of the constrction work 2.1.1 Documents and materials include: - As-build documents, registration records for road and bridge inspection, bridge inspection records - Documents: + Legal documents + Periodic and irregular inspection minutes + Acceptance minutes + Videotapes, CDs, photos 2.1.2 Documents and materials should be managed systematically and scientifically; convenient during exploitation and use; arranged in accordance with the standard of the archive 2.1.3 Management Conditions - It should have the archive storage - It should have measures against damage or loss - It should have qualified in-charged staffs 2.1.4 The update of additional data into documents and materials should be in accordance with the regulations (regarding to update time, data ) 2.1.5 Hierarchical archive of documents and materials: - Directorate for Road of Vietnam: Arhive initial as-build documents (original) by Decision 2578/1998/QD-BGTVT-CGD dated October 14, 1998 of MOT on "Issuance of content and lists of as-build documents of bridge and road construction works"; bridge inspection records; bridge profile records and road registration records - RM Agency (Department of Transport, PT): Archive initial as-build documents (copies); as-build documents for every time of RP and IR Inspection minutes, bridge inspection records; processing minutes against encroachment and violations of road safety corridors and other related documents; bridge profile records and road registration records - Units in charge of road management and repair: Archive as-build documents for every time of PR and IR Inspection minutes, bridge inspection records; processing minutes against encroachment and violations of road safety corridors and other related documents; bridge profile records and road registration records 2.2 Road safety corridor management: Responsibility of road safety corridor management: 2.2.1 DRVN: Annually, based on report data from management units, shall conduct the synthesis and analysis to make plan to submit to competent authorities for approval - Inspect and supervise the implementation of road corridor safety management - Propose mechanisms and policies on road corridor safety management submit to competent authorities for approval 2.2.2 RM Agency (Department of Transport, PT): Carry out the performance, supervise the implementation of units who directly manage, forces under RTI shall perform their assigned tasks within the management scope - Coordinate with local authorities to implement road corridor safety protection - Make reports in prescribed forms 2.2.3 M&R Agency: Unit who is directly responsible for preserving road safety corridors - Collaborate with RTI in patrolling, checking and inspection of road corridor safety protection - Coordinate with local government in preventing the encroachment and violations of road corridor safety - Make management records, perform storage and preservation and regularly update on status of encroachment and violations of road corrdiro safety in the management area - Monthly, perform the synthesis and and report as regulation Note: Records of road corridor safety management include: + Diagram of stretch which fully show occupied buildings within the scope of road corrirdor safety + Handover record with locality on LCS + Commitment minutes from households living along the street, not encroaching and violating road corridor safety 2.3 A Inspection and supervision on technical status of the construction work: Road and works on road 2.3.1 Regular inspection: Perform road patrol time/week In case of detecting any damage to the road which may cause unsafe traffic or traffic jams, the encroachment and violation of road corridor safety, it should report to the County to handle and solve For cases beyond the capability, it should timely report to higher road management agencies 2.3.1.1 Duties: - Timely detect law violations and infringe on road works, road safety corridors and damage causing unsafe traffic such as house construction, building materials, electric poles, illegal establishment of shops and pubs in road safety corridors and inform the County’authorities - Check pavement, bridges, drainage systems, road signaling system and other ancillary works to detect any damage that may cause traffic accidents If the work volume beyond capacity of staff in charge of road patrol, it should inform the superiors to improve the plan - In case of events causing traffic congestion such as land slide, flood, broken bridges , firstly, it should take measures to ensure traffic safety (railings, travel prohibition signals ), and find alternatives to ramification and report the superior - Staff in charged of road patrol should timely repair minor damage of bridge and road which does not require a lot of manpower to ensure traffic safety, such as collecting scattered stones on the road, fixing inclined stakes, cutting tree branches preveting visibility - Cooperate with road traffic police force and road traffic inspectorate to clear the road in case of having trouble-encoutered vehicles on road (broken machine or accident) to prevent traffic jam - Perform statistics and monitor traffic accidents occured on the assigned road section, fully record the cause of the accident (if possible) - Propose repair plan of regular or irregular repair for road and bridge with the County and Company - Monitor traffic safety at construction locations; if traffic safety did not satisfied requirements, it should remind contractors to improve and report to superiors for solution - Fully record status of bridge and road into "Road patrol daily record" Upon the completion of road patrol in the day, road patrol staff shall immediately report to the County all the status of the bridge and road of that day 2.3.1.2 Equipment: Patrol staff should be equipped in accordance with the unique regulation (see Appendix 1) 2.3.1.3 Patrol staff should be at least at high school qualification and trained specific profession in order to accomplish the task He should have good health, highly responsible manner and at least level qualification for worker 2.3.2 Periodical inspection: includes monthly and quarterly inspection 2.3.2.1 Monthly inspection: conducted by M&R Agency with the County’s RM Agency, including the following contents: 2.3.2.1.1 Check internal affairs: - The status record of road and bridge of the County - The documents and materials (monitoring records of accidents, traffic flow, road patrol, accounting books and statistics ) of the County 2.3.2.1.2 Site inspection: - Check the damage and degradation status of the road and other works on the road - Assessment of the Maintenance and Repair of the County - How to check: simple, visual, using conventional measuring instruments - Checking scope: the entire route in the jurisdiction of the County; detail as follows: + For the pavement:  Check the positions of settlement, landslide, dangerous high slope sections, locations frequently submerged tin rainy season These positions should have sufficient warning signs, guardfence for dangerous area, or water column  Check trimming work, additional filling for embankment and curb as prescription + For pavement: Check and determine the volume and damage degree on each km: potholes, cracked, concaved, rubbered , particularly at bridge (culvert) approach slab where local settlement occurred frequently + For drainage system:  Check drainage status of culverts, sand deposition of manhole at upstream, downstream and inside culvert; deterioration of culvert pipes, plates, seamless, top wall, side walls, apron (especially apron at downstream where erosion happened frquently )  Check drainage operation of ditch system, particularly at road sections of significant longitudinal slope which are vulnerable to remarkable erosion, causing danage and unstability to embankment; check the damage of masonry ditch + For road signaling system: Check numbers and technical conditions (poles, signboards, convex mirror, flexible median ) + For dyke work, retaining wall, overflow protection work : Check the stability, the damage of the works; safety equipment such as water column, poles, signs 2.3.2.2 Quarterly inspection: conducted by RM Agency (Department of Transport, PT) with M&R Agency, including the following contents: 2.3.2.2.1 Check internal affairs: - The status record of road and bridge of the County - The documents and materials (monitoring records of accidents, traffic flow, road patrol, accounting books and statistics ) of the unit 2.3.2.2.2 Site inspection: - Check the damage and degradation status of the road and other construction works on the road - Assessment of the Maintenance and Repair of units under management - How to check: simple, visual, using professional methods - Checking scope: the entire route and some random sections or works to assess RM - In-charge staff should synthesize and evaluate status of each Km, bridge and report to inspection delegations B For bridge The inspection is to assess working status of the bridge, discover the damage which may cause unsafe traffic and impact on load capacity of the bridge, and monitor the damage which has been marked from previous inspections 2.3.1 Frequent checking: - Conducted by the County’s Head or technical staff authorized by the County’s Head The work is to understand the work condition and make repair plan - Check all types of bridge on the route under the management of the unit - For significant bridges (for particular great bridge, it should have specified rule), it should have inspection outline to check regularly, and performed by the County’s Head - Results from frequent checking and measurements from damage monitoring, solutions and volume required repairs should be fully into Records of frequent checking of bridge - When detecting any damage that is deemed to affect the safety of the work, it should immediately report to superiors to make inspection plan and immediate repair, ensuring traffic safety Also, the County’s Head should immediately apply temporary measures to keep the work safety and traffic safety - Content for frequent checking: + Check bridge desk:  Status of bridge desk cover;  Drainage condition of bridge desk;  Status of joints: broken, crushed ?;  Status of wheel guard, railings;  Other devices such as signs, lighting columns, protection walls at bridge approach slabs + Check bridge girders:  For steel structures: Check status of beams and steel girders (bent, deformed, twisted, broken ?); status of paint and erosion of steel girders; status of links and joints of girders; status of bolts, joint rivets and rusty condition of structural parts  For RC and PRC or combined steel beams: Check the status of cracking, chipping, breaking, peeling out of the concrete; Check the status of rust and deterioration of reinforcing steel; Waterproof status, water leakage under beam flange and bridge deck  For arch structure: Status of crack, break of grout and waterproof at the bottom of the arch + Check bearings:  Check the deformation, corrosion, chipping of rollers, studs of bearing, horizontal displacement of rollers, the incline and deflection of rollers along bridge centerline for steel bearing type;  Check the aging and deformation of rubber bearings;  Check the flatness, cleanliness and ventilation of bearings;  Check greasing work for bearings + Check abutments, piers:  Check status of cracks, mortar joint, rip-rap; weathering and corrosion of concrete of abutment body and and pier body;  Check the erosion at foundation of abutments and piers; the inclination, displacement and settlement of the abutments and piers;  For all test cases, it should check horizontal crack of the abutment, particularly piers whose height on the curve; check exposed part due to erosion;  Check cutoff dike and quarter cones;  Check road pavement behind abutments + Check protection works and flow regulation works such as channel direction dike, protection works of approach roads, river embankments etc It should pay attention to the stability of these works (no break, landslide, inclination, settlement) and evaluate the effectiveness of such works 2.3.2 Periodical inspection: - Annualy, perform inspections: before and after storm season Upon the inspection, it should check in detail the tructural parts of the works It is required to have specialized equipments for intestigation and measurement - Check before storm season: Focusing on abutment, quarter cones, embankment behind abutment; flow control works for river/stream, and other protection works It should timely detect and repair the damage to prevent and mitigate incidents caused by floods - Check after storm season: + Check conditions such as landslides, erosion at abutment/pier foundation which may cause inclination and crack, directly affecting the safety of the works and traffic safety + Check flow change compared to previous storm season which may cause the deposition and erosion around bridge abutments and piers For this type of inspection, it is required the participation of staffs from RM Agency (Department of Transport, PT); if necessary, staffs from RM Agency (Department of Transport, PT) may directly operate this inspection Inspection results will be main basis to modify the year-end plan; also, as a basis to make plan for each bridge to monitor, control, carry out RM and repair for next year 2.3.3 Irregular check: Conducted by M&R Agency and RM Agency (Department of Transport, PT) or DBVN when occurring incidents to bridges/roads or upon the request from superior authorities Upon the check, it should clearly determine the cause of the damage, assess the damage and take measures for timely and appropriate treatment 2.3.4 Special check: Conducted by RM Agency (Department of Transport, PT) Outline should be approved by competent authorities Check contents: 2.3.4.1 For embankment: Embankment sections on soft soil or earthwork slip: check the subsidence of embankment or horizontal displacement due to the operation of earthwork slip 2.3.4.2 For pavement: - Check the pavement strength: load-bearing capacity of the pavement structure is evaluated by the intensity factor, Kcd Kcđ = Ettế / Eycầu whereas : Eycầu (daN/cm2): Required elastic modulus based on vehicle flow and load at calculation in accordance with 22 TCN 211- 93 Ettế (daN/cm2 ): Equivalent elastic modulus of existing pavement structure, measured by Benkenman in accordane with 22TCN 251- 98 With Kcđ 120 km/h Htb > 1.20 Very rough Road passing through difficult and dangerous terrain (curves with a radius of 5%, slope length> 100m) With Kbám < 1: it should enhance pavement roughness by measures such as paving asphalt, paving void AC layer - Check flatness: Flatness status of pavement determines exploitation quality of pavement structure and operation cost, measured by flatness coefficient of the pavement, Kbp Kbp = Sgh / Sttế Whereas: Sgh : permissible flatness limit corresponding to each type of road pavement Sttê : actual flatness degree Sttê : determined by indirect or direct method, depending on the available device of the management unit (measurements in accordance with 22TCN 277-01 ‘Standard of checking and evaluating pavement flatness based on flatness index IRI’) Sgh : each type of pavement (Appendix 2) With Kbp < 1, it should restore the pavement flatness by paving asphalt or paving a thin layer (for asphalt pavement or CC), or repair the surface (for macadam/aggregate pavement ) With Kbp < 1, but the measured flatness index is at the average level of each type of road surface, it should repair potholes and make compensation for local concave points 2.3.4.3 For bridge: After regular inspections, periodic inspections, irregular inspection, in case of detecting complicated technical problems, RM Agency (Department of Transport, PT) shall conduct special inspections 2.3.5 Bridge evaluation: Bridge evaluation is to assess the condition and the actual load capacity of the bridge, to help authorities to take measures to operate the transport and make repair plan Evaluation stages: - Initial evaluation: for great bridges using new materials when putting into operation, it should conduct evaluation to determine "status 0" of the bridge when as-build documents has not been completed - Next evaluation: After exploitation period of 10 years, the evaluation shall be conducted again; then for every 5-7 years, the evaluation shall be conducted (from the last evaluation) - Besides, when detecting serious damage which may affect traffic safety and safety of the work, the evaluation shall be conducted immediately Evaluation decentralization: - For bridges of complex structure and application of new materials, the content of evaluation outline should be approved by DRVN Evaluation results shall be reported to DRVN - For remaining types of bridge of uncomplicated technique, evaluation outline shall be approved under decentralization Tasks and requirements of evaluation: - Assess situation and determine bearing capacity of the bridge; regulation on conditions of transport exploitation - Evaluate the environment in bridge area which may affect the exploitation - Propose treatment measures - Determine the effectiveness after the reinforcement and repair Content of evaluation report: - Name of: bridge, station, highway, location - General bridge layout - History and characteristics of bridge exploitation - Actual technical status of bridge - Existing issues required clarification - Conclusions on evaluation results, load bearing capacity of bridge parts (abutments, piers, beams ) - Restoration and repair measures 2.4 Classification and evaluation of technical condition of the construction work Classify and evaluate technical condition of the construction work in order to make repair plan 2.4.1 For road: Based on damage status of embankment and pavement (potholes, elasticity ), pavement strength, roughness, flatness to classify For classification criteria, see Appendix 2.4.2 For bridge: Based on inspection results (periodic, irregular, special), evaluation results management units shall make detailed reports for each bridge as a basis to make repair plan or reconstruction plan 2.5 Vehicle counting: 2.5.1 Purpose: Directly conducted by M&R Agency in order to understand the actual situation of running vehicles on each road section, each region and the change in number, type and vehicle weight each season and each year as the basis for the forecast for the following year, facilitating the annual planning for maintenance, repair and construction 2.5.2 Contents of vehicle counting: 2.5.2.1 Vehicle counting station: station types, including main station and sub-station - Main station: fixed station, no change, used to study vehicle flow, types and vehicle load on a road section or an area - Sub-station: identify local traffic flow on a short road section, narrow area or on road with low traffic flow in order to serve the repair or upgradation of the road 2.5.2.2 Principle of station allocation: - All counting stations should establish a proper network - The location of the station should present a typical traffic flow of the road section between two intersections Stations should be located at suitable positions to ensure that the collected data shall reflect truly the vehicle flow on that road setion - On roads of high traffic flow or main roads, it should allocate station per 30-50 km On secondary roads or access roads, it will be station per 50-100km - At ferries, pontoons and toll stations, main station should be placed 2.5.2.3 Time for vehicle counting: time/month in consecutive days at a counting station Vehicle counting shall be done on dates of 5th, th, 7th (for main station) and on 5th, 6th (for sub-station) For the first two days: counting in 16/24h (from 5:00 to 21:00); for the 3th day: counting in 24/24h (from 0:00 to 24:00) to determine average traffic flow of that month; make arithmetic mean for 12 months to have average vehicle flow of an entire day per year 2.5.2.4 Counting method: by manual or by machine - Manual counting: Counting on both directions of traffic flow on a cross-section of the road - Counting by machine: follow instructions for each type of machine Vehicle classification of counting machine should conform to the provisions of Appendix Counting data is stored in the machine It should regularly maintain the operation counting stations using specialized counting machine, in which the recorded data shall be transfered to superior authorities 2.5.2.5 Report and data collection: - On 10th of every month, counting stations shall sent report to M&R Agency - On 15th of every month, M&R Agency shall synthesize data and report counting results to RM Agency (Department of Transport, PT) - In year, RM Agency (Department of Transport, PT) shall analyze, synthesize and report data to DRVN on average counting numbers for the first months and annual averages Time to send report to DRVN shall be from 20th to 30th of July and in January of the following year - Report forms of vehicle counting and classification by manual method: see Appendix For counting may machine, it shall report based on the machine’s program 2.6 Standing duty for traffic assurance Regulation on prevention and remedy against flood outcomes is stipulated by MOT at Decision 2988/2001/QD-BGTVT dated 12 Sept 2001 as follows: Every year, in storm season, in case of having alarm level or higher, road management agencies shall deploy forces on standing duty to ensure traffic for 24/24h to quickly handle occurred incidents due to storm and flood 2.7 Bridge guarding On routes having weak bridges but without tunnel and bypass at such location, M&R Agency should arrange bridge guarding for 24/24h for traffic control, and only allow vehicles whose load (total load of vehicle and good) not exceeding load capacity of the bridge to pass For overloaded vehicles, it should take measures such as unloading of goods or guidance for vehicles to use bypass or temporary road In addition, for great or significant bridges or bridges of complex structure M&R Agency shall carry out bridge guarding for 24/24h (This case shall be specified by competent authorities) 2.8 Registration of bridges, roads 2.8.1 Registration purpose: The routes when putting into operation shall be under "Registration of bridges and roads" After exploitation period of 10-15 years, it is required to register again in order to determine the initial technical status and the change of technical factors during extraction Registration documents includes: 2.8.1.1 Road: - Diagram of stretch, showing: + Geometric elements of the road (horizontal curve radius, R horizontal; verticle curve radius, Rvertical; horizontal slope ihorizontal; extreme high slope, iultra high; longitudinal slope, ilongitudinal; embankment 10 APPENDIX 2: ALLOWABLE LIMIT ROUGHNESS INDEX SGH (In accordance with point 5.2 section V Method for measuring and assessment roughness by International Roughness Index IRI 22TCN 277 - 01 attached in Decision No 2348/2001/QĐBGTVT dated 20th Jul 2001 by MOT) Pavement type Road class Pavement condition Good Medium Bad Very bad Expressway class 60, Highway class 60 IRI ≤ 3< IRI ≤5 5< IRI ≤7 7< IRI ≤9 High grade A2: Cold mix Highway class 60 asphalt, warm mix asphalt, asphalt penetration, water bound macadam with asphalt IRI ≤ 4< IRI ≤6 6< IRI ≤8 8< IRI ≤10 IR2 ≤ 6< IRI ≤9 9< IRI ≤12 12