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Rapid Replacement of Short Span Local Government Bridges Using the Rocla M-Lock Bridging System

Rapid Replacement of Short Span Local Government Bridges Using the Rocla M-Lock Bridging System. Ken Wheeler Senior Principal, Manager Bridges Cardno The Australian Small Bridges Conference 2005. Introduction. Overview of short span bridge replacements

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Rapid Replacement of Short Span Local Government Bridges Using the Rocla M-Lock Bridging System

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  1. Rapid Replacement of Short Span Local Government Bridges Using the Rocla M-Lock Bridging System Ken Wheeler Senior Principal, Manager Bridges Cardno The Australian Small Bridges Conference 2005

  2. Introduction • Overviewof short span bridge replacements • AS5100 and state road authority design requirements • Development of M-Lock bridging system for local roads & highways • Applications of M-Lock bridging system to rural and urban bridgesites around Australia Page 2

  3. Overview • Australia has a large number of timber, steel and concrete bridges requiring on-going maintenance and rehabilitation. • Number of timber bridges: • New South Wales: 4850 • Queensland: 3500 • Western Australia: 3000 • Victoria: 625 • Tasmania: 100 • Approximately 88% of timber bridges are owned by local councils Page 3

  4. Overview • Most of these bridges were designed for a 20 tonne truck, are understrength and need to be replaced in the near future - maintenance and safety issue for owners. • Recent survey within NSW by Cardno • Maintenance cost of timber bridges: $19m • Maintenance cost of steel bridges: $7m • Maintenance cost of concrete bridges: $11m • Planned replacement of bridges: 58 per year • Planned refurbishment of bridges: 100 per year Page 4

  5. Overview • Survey identified following criteria for assessing bridge systems for use in bridge construction: - Life cycle cost - Maintenance required - Design life - Initial cost • Initial cost is a critical factor given the limited maintenance funds available Page 5

  6. Overview • Bridge community is conservative by nature because of high level of responsibility for public assets. • New bridge technologies carefully introduced – wide acceptance only given after proven satisfactory performance. • Issues considered for bridge replacements include: - strength and robustness - speed of installation – minimal traffic disruption - minimal on-site activities, especially placement of concrete in remote areas • skill levels required for construction personnel Page 6

  7. Overview • Modular bridge systems developed for short span bridge replacements include: - Humedeck - M-Lock - Doolan deck • Waldren • FRP composite • Span lengths generally up to 12m Page 7

  8. Design Requirements • AS5100 introduced in May 2004 • Nominates SM1600 as design live load – corresponds to a 72 tonne vehicle over a 10m span bridge – provision for potential future increases in legal load limits • New bridge barrier performance levels • Forces resulting from water flow, particularly buoyancy effects Page 8

  9. Design Requirements • RTA, NSW Bridge Policy requirements for modular bridges: • CBE 99/1 (February 1999): • defined as precast structural components connected together to form a bridge deck with no in-situ concrete topping slab • restrictions on joint placements related to AADT Page 9

  10. Design Requirements • CBE 99/5 (July 1999): • Clarified requirements for multi-beam bridges • Longitudinal joint restriction – limited to traffic volumes <1000 AADT or 300 AADT for heavy vehicles (30 year projections) • Transverse joint restriction - limited to traffic volumes <2000 AADT or 500 AADT for heavy vehicles (30 year projections) Page 10

  11. Development of M-Lock Bridging System • Based on Rocla product first introduced in USA in 1952 • Redesigned and detailed to comply with 1992 AUSTROADS Bridge Design Code requirements • Updated to comply with AS5100-2004 Bridge Design Code • Designed for T44/HLP320 and SM1600 live loadings Page 11

  12. Development of M-Lock Bridging System • Precast reinforced concrete components: • Piles – driven and socketted • Pier and abutment headstocks • Deck units • Traffic barriers • Span lengths: 7m, 8m, 9m, 10m,11m, 12m spans • Skews of 15 and 30 degrees • Longitudinal grouted shear keys between deck units Page 12

  13. Development of M-Lock Bridging System • Local Roads System: • AADT < 1000 vehicles • Transversely bolted deck units plus upturned ends of headstocks • Generally 2% two way crossfall • No in-situ topping or wearing surface • In use since 1995 – approx 110 bridges constructed within Australia Page 13

  14. Development of M-Lock Bridging System • Highways System • AADT > 1000 vehicles: unrestricted approval granted by RTA, NSW in 2001 and subsequently accepted by VicRoads, Qld Main Roads, WA Main Roads and SA Dept Transport • Deck units transversely stressed • Asphaltic concrete wearing surface • First bridge constructed in 2002 at Bella Vista, Sydney Page 14

  15. Development of M-Lock Bridging System • Recent developments: • Barrier types – castellated, Thrie, precast reinforced concrete, metal post & rail, combined pedestrian/traffic • Precast cantilevered footway panels • Façade panels • Incorporation of services penetrations • Incorporation of grates (DIPNR requirements) • 15m span length Page 15

  16. Applications of M-Lock Bridging System Bridge Over Ohio Creek, Walcha, NSW (1995) Page 16

  17. Applications of M-Lock Bridging System Bridge Over Bokhara River, Goodooga, NSW (1999) Page 17

  18. Applications of M-Lock Bridging System Bridge Over Culgoa River, Goodooga, NSW (1999) Page 18

  19. Applications of M-Lock Bridging System Bridge Over Drainage Channel, Blair Athol, NSW (2000) Page 19

  20. Applications of M-Lock Bridging System Bridge Over Davies Creek, Bathurst, NSW (2001) Page 20

  21. Applications of M-Lock Bridging System Bridge Over O’Connell River, Bloomsbury, Qld (2002) Page 21

  22. Applications of M-Lock Bridging System Chancellor Park, Sippy Downs, Qld (2002) Page 22

  23. Applications of M-Lock Bridging System Bridge Over Elizabeth Macarthur Creek, Bella Vista, NSW (2002) Page 23

  24. Applications of M-Lock Bridging System Bridge Over Cosgroves Creek, Luddenham, NSW (2004) Page 24

  25. Applications of M-Lock Bridging System Bridge Over Darling Anabranch, Wentworth, NSW (2003) Page 25

  26. Applications of M-Lock Bridging System Green Views Estate, West Hoxton, NSW (2005) Page 26

  27. Applications of M-Lock Bridging System Bridge Over Belubula River, Carcoar, NSW (2004) Page 27

  28. Applications of M-Lock Bridging System Bridge Over Gascoyne River, Bibbawarra, WA (2005) Page 28

  29. Applications of M-Lock Bridging System Bridge Over Shoalhaven River, Braidwood, NSW (2005) Page 29

  30. Applications of M-Lock Bridging System Bridge Over Kenny Creek, Camden, NSW (2005) Page 30

  31. Conclusion M-Lock Bridging System: • Versatile for wide range of applications • Minimal on-site activities • Economical • Easy to construct Page 31

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