1. Masonry Arch Bridge Reinforcement – ‘XiSPAN’ Matt Hunt

2. Masonry Arch Bridges
Over 25,000 on railways in the UK, 200,000 in Europe
Many over 100 years old
Increased tonnage and increased line speeds
Heavier use on diversionary freight routes

3. XiTRACK Concept
2-component polyurethane, with designable properties
Mixed on-site at point of application and poured over ballast
Penetrates and captures ballast stones in a strong matrix
Utilise compressive strength of ballast
Tensile strength provided by polyurethane + =

4. Existing situation

5. Stress and Loading

6. Intense loads

7. Distributed Loads

8. How it works

9. Analysis (LimitState:Geo)9

10. Installation ‘the easy bit’

11. Results
Monitoring

12. Development
Creating a ‘standard detail’ option, which would be over designed on most bridges but avoids the full design process for each structure
Inclusion of waterproofing

13. Operational Benefits Can be delivered now
Can easily be incorporated with track renewals
Spandrels can be protected with upstands or beams
Removal of DTS ‘prohibited’ status
Longer lasting remedial work such as pointing

14. New inspection requirements
A ‘standard detail’ option
Concrete saddle
Sprayed concrete
Steel anchors
XiSPAN
Impact
Intrusive, new response modes
May reduce clearance, visually intrusive
New response modes, intrusive
Minimal structural and visual impact
Can be ‘tuned’
Inspection
New inspection requirements
No new inspection requirements
Installation
Requires removal of track & full depth fill removal, time consuming
May require closure of road below
Intrusive, time consuming
Simple, rapid, short possessions
Partial fill removal 14

15. NWR Partnership Awards