Technical Bridge Design Review Workshop Presentation # 1 Program - - PowerPoint PPT Presentation

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Country Bridge Solutions

Technical Bridge Design Review Workshop Presentation # 1 – Program and Project Overview, Program and Project Objectives and Work Done to Date

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Thank you and Welcome!

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Peter Mahar Roads and Maritime Services Project Manager

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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

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The involvement of councils is critical to the solution

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

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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.

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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.

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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.

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Any questions?

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Technical Bridge Design Review Workshop Presentation # 2 – Overview of the “givens” for the Country Bridge Solutions program

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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
• f 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”.

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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

• f 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

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Any questions?

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Technical Bridge Design Review Workshop Presentation # 3 – Detailed Overview of the Bridge Design Solution

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Roads and Maritime Services Prestressed Concrete Modular Bridge

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Country Bridge Solutions Background

Background

• Deteriorating council-owned timber beam bridges
• Cost effective and innovative standard replacement

solution required

• Design criteria established
• Prestressed concrete solution chosen

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Opportunities

• Existing timber longitudinal deck planking
• Carriageway width
• Barriers do not meet modern standards
• Industry wide standard replacement solution

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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

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Traffic Loading

• Roads and Maritime BTD 2014/01 Traffic Loading for

Bridges

• Standard deck module developed
• Freight function
• SM1600 design traffic loading adopted

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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

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400 1650 400

Internal Module Cross Section

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Bridge Cross Section

8500 850

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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

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Bridge Articulation

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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

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Bearing Installation

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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

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Headstock Support Frame

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Abutment Scheme

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Suggested Construction Sequence

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Suggested Construction Sequence

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Suggested Construction Sequence

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Suggested Construction Sequence

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Suggested Construction Sequence

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Suggested Construction Sequence

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Suggested Construction Sequence

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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

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Questions?

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Technical Bridge Design Review Workshop Presentation # 4 – The Way Forward

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Country Bridge Solutions Next Steps The NSW Government and regional councils will jointly deliver the Country Bridge Solution to communities.

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Next Steps

Working Party IPWEA* Bridge Working Party + representative from each eligible ROC*

(12 to 15 max)

* IPWEA: Institute of Public Works Engineering Australia ROC: Regional Organisation of Councils MCA: Multi Criteria Analysis RMS 14.491