Masonry Arch Bridges: Condition Appraisal and Remedial Treatment CIRIA RP692 - Examples -

1. Masonry Arch Bridges:Condition Appraisal and Remedial TreatmentCIRIA RP692- Examples -

2. Assessment

5. Monitoring and Inspection

9. Repair

10. Is it possible to excavate back to the arch barrel extrados? YES Saddle, waterproof and repoint arch barrel It is assumed that the spandrel wall is in good condition. Any bulging, tilting, sliding etc has been appropriately repaired using tie-bars and patress plates or other means. START Install relieving slab, waterproof and repoint arch barrel NO YES Is the structural integrity of the arch barrel very poor? Does the arch barrel need waterproofing? Is the cracking of the arch barrel extensive? YES Stitch cracks or reconstruct NO NO Grout arch barrel and/or retrofit reinforcement NO YES YES Use spray/cast insitu concrete repair to arch barrel intrados Reconstruct Is the fault due to active subsidence? Is the repair required to be permanent? Is the arch heavily distorted? NO Use sprayed concrete repair to arch barrel intrados NO YES NOTE: The repairs identified in this flowchart will change the nature of the structural behaviour of the arch and consequently appropriate assessment techniques should be used to determine the new carrying capacity of the bridge. NO Install steel plate lining to arch barrel intrados YES Is the span of the arch >5m? NO Underpin structure and/or support arch with steel ribs YES Install corrugated steel lining to arch barrel intrados Repair methods for consideration in the repair of arch barrels (for single-span bridges)

12. Concrete saddle