Step 3: Major maintenance

Major maintenance includes defects of structural and hydraulic significance affecting the function of the bridge. Such defects might require detailed investigation, design and cost estimation for maintenance works. Defects include all, or some of, the minor maintenance works plus major repair/replacement of slabs/bearings, ballast walls etc. Bridge inspections (including routine, principal and special) all provide information regarding major maintenance to update the BMS.The principal inspection, carried out through consultants, shall be the prime source for updating the BMS periodically. The BMS generates the priority list of major maintenance. The Bridge Projects shall engage consultants to prepare design and drawings andcost estimates for such defects and implement their rectification through contractors. The civil works shall be supervised either through engaging a supervision consultant or by Division itself; however in both cases supervision shall be managed by the Project Management Team in the Divisions, refer ▬►Program Appraisal Document BIMP Table 3.3: Maintenance Classification and Definitions, Page 40, see an example of ARMP

Program Appraisal Document BIMP Table 3.3: Maintenance Classification and Definitions, Page 40

Table 3.3: Maintenance Classification and Definitions

Class	Diagnostic	Scope of Work
1. Routine Maintenance	No significant defect & no replacement or repair of any element of the bridge is required. The work involves routine activities to be conducted in a cyclic manner. RM is defined as the servicing of a bridge structure	Removal of debris(soil, aggregate, cow dung and or any foreign material) from deck, footpath, railings, bearing, expansion joints; Cleaning and lubrication of bearing; and Removal of grass, bushes from bridge surfaces, wing and or abutment wall, bearing area approach road Cleaning of drainage spout on the deck Drain out the accumulated water in the chambers, cleaning and re-greasing of main and hanger cables for suspension bridge and check the abnormal vibration of stay –cable for cable-stayed bridge.
2. Minor Maintenance	Damages detected are very minor and do not require any design input to carry out the treatment or rectify the defects.	Rectification and replacement of bridge expansion joints, railing posts, safety barriers, sign board; Rectification damages of approach slabs, ballast walls etc. Minor bed protection to minimize scour required to keep the foundations unexposed, bank protection in order to prevent breaching of approach road; Tightening of loose bolts/ U-hooks, replacement of missing knot bolts in the steel members, spot re-painting work of steel members of suspension as well as cable-stayed bridge. Reporting to DRO office in case of abnormal vibration of cable system during wind.
3. Major Maintenance	Numerous defects of structural and hydraulic significance which may soon prevent the bridge in its proper functioning. Detailed investigation may be required to design the maintenance work (e.g. non-destructive testing)	All or some of the minor maintenance work scope plus Major repair/replacement of slabs/ railings, bearings, piers Painting and replacement of steel members Greasing, covering of cables, changing of deck material and tightening or replacing bolts, inspection of anchoring system etc of suspension /cable-stayed bridge Bed and or bank protection works (River training works) costing more than 0.3 million rupees Major maintenance of decking system and re-painting of steel members Seeking expert advice for major maintenance of anchorage system, main cable/hanger, cable/suspension devices/saddles for suspension bridges and also stay-cable pylon/tower and anchoring devices at pylon as well as at deck for cable-stayed bridges Jacketing of pier columns
4. Emergency Maintenance	One or more elements of the bridge is heavily and critically damaged that compromises the safety of the traffic using the bridge; Emergency repair of one or more parts are required followed by major maintenance of the bridge; Load restriction and traffic safety signs need to be put in place	All or some of the minor maintenance work scope plus Major repair/replacement of slabs; and/or Major repair/replacement of railings Major repair/replacement of piers; and/or Repair rehabilitation or new construction of check dam when the bridge is at risk from scour Remedial measures as advised by experts after investigations shown in scope of works for Major Maintenance.

Example of ARMP

« Previous | Next »