country bridge solutions - technical bridge design review ... · presentation # 1 – program and...

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August 2014

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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August 2014


Thank you and Welcome!

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August 2014


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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August 2014


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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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.

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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.

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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.

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August 2014


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 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”.

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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

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August 2014


Any questions?

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August 2014


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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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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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

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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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August 2014


400 1650 400

Internal Module Cross Section

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Bridge Cross Section

8500 850

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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

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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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August 2014


Headstock Support Frame

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Abutment Scheme

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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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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

country bridge solutions - technical bridge design review ... · presentation # 1 – program and...

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