Country Bridge Solutions August 2014 Technical Bridge Design Review Workshop Presentation # 1 – Program and Project Overview, Program and Project Objectives and Work Done to Date - 1 -
Country Bridge Solutions August 2014 Thank you and Welcome! - 2 -
Country Bridge Solutions August 2014 Peter Mahar Roads and Maritime Services Project Manager - 3 -
Country Bridge Solutions August 2014 The state of our country bridges Local councils face the growing challenge, as road authorities, of maintaining and eventually replacing aging bridges on their regional and local roads - 4 -
Country Bridge Solutions August 2014 A fresh approach The NSW Government is developing an innovative and cost effective solution to enable regional councils to replace bridges on their roads: Collaborative approach Simple and easy to build Use existing council resources Provide manuals to assist with design, development and construction The involvement of councils is critical to the solution - 5 -
Country Bridge Solutions August 2014 Program Objectives: • Improve the reliability of road connections in regional NSW • Ensure meaningful involvement of local government in developing the solution, determining priorities and delivering the projects • Develop a cooperative approach between the Commonwealth, State and Local governments in addressing the replacement of these structures • Engage with councils, industry and local communities to create meaningful employment in regional NSW • Generally enhance the relationship between Roads and Maritime and local government • Strengthen the position of Roads and Maritime as a technical adviser, coordinator of road activity and a keeper of road standards. - 6 -
Country Bridge Solutions August 2014 Project Objectives: • Develop an innovative and cost effective solution for the replacement of bridges maintained by councils on regional and local roads in regional NSW • Develop an agreed and updated set of Bridge Standards for bridges on regional and local roads • Involve elite engineering and logistical skills to optimise the solution • Enhance the experience and skills of local government staff to deliver consistent products to agreed standards • Ensure the solution overcomes key constraints such as access to technical skills and high quality materials • Maintain high standards of Work Health & Safety (WHS) and environmental practice. - 7 -
Country Bridge Solutions August 2014 Work Completed to Date: • Project framework and project plan established • Initial design completed for a prestressed concrete modular bridge system with an inverted double tee deck unit suitable for SM1600 loadings • Minister for Roads and Freight, Duncan Gay was briefed and subsequently announced the project including collection of timber bridge inventory and prioritisation by January 2015 • Value Engineering Workshops with councils and industry in August 2014 • Roads and Maritime provides regular updates to TfNSW on the CBS project. - 8 -
Country Bridge Solutions August 2014 Any questions? - 9 -
Country Bridge Solutions August 2014 Technical Bridge Design Review Workshop Presentation # 2 – Overview of the “givens” for the Country Bridge Solutions program - 10 -
Country Bridge Solutions August 2014 Overview of the “givens” for the Country Bridge Solutions program: • The overall project involves three phases: 1. Concept Development, 2. Proof of Concept and 3. Construction, with a commitment only to complete phase one. Roads and Maritime Services is funding phase one. Phases two and three are dependent on available funding • Roads and Maritime will provide technical support and assist development of a framework for councils to deliver. Initially, the Country Bridge Solutions project will focus on the replacement of timber bridges in poor condition on regional and local roads • Success of the program will require a coordinated and collaborative approach from state and local government “The NSW Government and regional councils will jointly deliver the Country Bridge Solution to communities”. - 11 -
Country Bridge Solutions August 2014 Workshop Objectives: • Gain an understanding of the critical issues facing councils in bridge replacement and maintenance on their networks • Review the current Bridge Design Solution with a view to testing its appropriateness and highlight issues, concerns and potential improvements associated with various aspects of the project • Identify a way forward to address the issues and concerns, evaluate the improvements identified and ensure the design is robust as it moves forward in development - 12 -
Country Bridge Solutions August 2014 Any questions? - 13 -
Country Bridge Solutions August 2014 Technical Bridge Design Review Workshop Presentation # 3 – Detailed Overview of the Bridge Design Solution - 14 -
Country Bridge Solutions August 2014 Roads and Maritime Services Prestressed Concrete Modular Bridge - 15 -
Country Bridge Solutions August 2014 Background Background • Deteriorating council-owned timber beam bridges • Cost effective and innovative standard replacement solution required • Design criteria established • Prestressed concrete solution chosen - 16 -
Country Bridge Solutions August 2014 Opportunities • Existing timber longitudinal deck planking • Carriageway width • Barriers do not meet modern standards • Industry wide standard replacement solution - 17 -
Country Bridge Solutions August 2014 Initial Design Criteria • Straight bridge, constant grade, no skew • Low traffic volumes • Maintain current flood immunity • 100 year design life • Simplified construction • Maximise precast components and minimise in-situ concrete pours • Standardised foundation options and minimised geotechnical investigation requirements • Low performance level barrier suitable for submergence • Precast components able to be transported on standard trucks with fewer restrictions • Minimise whole of life costs - 18 -
Country Bridge Solutions August 2014 Traffic Loading • Roads and Maritime BTD 2014/01 Traffic Loading for Bridges • Standard deck module developed • Freight function • SM1600 design traffic loading adopted - 19 -
Country Bridge Solutions August 2014 Roads and Maritime Concept – Superstructure • Precast prestressed concrete twin ribbed bridge deck module • Modules connected by cast-in-situ closure strip • 8.5m carriageway width adopted • Two way 3% cross fall - 20 -
Country Bridge Solutions August 2014 Internal Module Cross Section 400 400 1650 - 21 -
Country Bridge Solutions August 2014 Bridge Cross Section 8500 850 - 22 -
Country Bridge Solutions August 2014 Roads and Maritime Concept – Superstructure Low performance level twin rail steel barrier – New Roads and Maritime standard barrier designed – Barrier transition to Thriebeam guardrail at abutments – If the site conditions permit, Thriebeam can be continued across the bridge – Regular performance level barrier can also be accommodated if necessary - 23 -
Country Bridge Solutions August 2014 Bridge Articulation - 24 -
Country Bridge Solutions August 2014 Roads and Maritime Concept – Bearings Laminated elastomeric rectangular bearings – Similar to standard practice for spaced plank bridges – Common problem with this type of structure is getting the module to be supported evenly on all bearings under dead loads – Proposed solution is temporary support on jacks under cross girder while bearing bottom attachment plates are adjusted then grouted - 25 -
Country Bridge Solutions August 2014 Bearing Installation - 26 -
Country Bridge Solutions August 2014 Roads and Maritime Concept – Substructure • Concept based on driven concrete piles • Precast pier headstocks and abutment sill beams, with innovative installation procedure involving a cast-in steel support frame • Abutment wall design adopted, comprising precast concrete wall panels bearing on driven piles to retain fill - 27 -
Country Bridge Solutions August 2014 Headstock Support Frame - 28 -
Country Bridge Solutions August 2014 Abutment Scheme - 29 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 30 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 31 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 32 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 33 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 34 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 35 -
Country Bridge Solutions August 2014 Suggested Construction Sequence - 36 -
Country Bridge Solutions August 2014 Roads and Maritime Concept – Substructure • Prestressing and reinforcement arrangements for 6m, 8m, and 10m spans as well as current 12m, keeping same cross section dimensions • There is the capacity in the section to extend to longer spans • Substructure solutions for ground conditions that do not permit driven piles • Continuous improvement of a standard - 37 -
Country Bridge Solutions August 2014 Questions? - 38 -
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