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Student Project Disclaimer 

This website has been developed by students from the University of South Australia as part of the Civil Engineering Design Project course. This website and any associated works relating to it is for the purposes of academic study only and does not represent the views or opinions of the end client, Department of Planning Transport and Infrastructure (DPTI).

TENDER STAGE

PROJECT DESCRIPTION

TENDER STAGE

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Jason Maddison

Project Manager

Joseph Cavallaro

Assistant Project Manager

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WINNING TENDER TEAM

SUBMITTED TENDER DOCUMENTS

Click the logos below to download respective Tender Documents

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Call for Tender

The Call for Tender from the Department of Planning, Transport and Infrastructure (DPTI) invites engineering consultancies to submit a Tender of Offer and quotation to undertake a feasibility study exploring potential solutions for the O-Bahn City Access Project. 

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PROJECT PROPOSAL AND AIMS

At 12 kilometres long the Adelaide O-Bahn is the longest and fastest guided bus service in the world, travelling at speeds of up to 100 kilometres per hour. More than 8 million passengers a year, including local, interstate and overseas visitors, use the O-Bahn and the system is capable of moving 18,000 people in each direction every hour. 
 
In the recent Budget, the Commonwealth Government announced significant investment in South Australia’s road and rail infrastructure. Part of the investment includes an extension of the dedicated O-Bahn corridor to ease peak hour delays resulting from traffic congestion, by separating bus and road traffic on the final 4.4 kilometres of the O-Bahn route to and from the CBD. 

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The key aims as specified by DPTI are as follows:

  • To improve bus operations to and from the CBD in terms of frequency, extension of routes, and the implementation of bus priority lanes to actively promote public transport as a genuine safe and efficient alternative to the car.

  • To enhance and integrate with the parklands and adjacent heritage properties.

  • To identify appropriate bus priorities for bus services for the east–west and O-Bahn bus services with the Adelaide CBD.

  • To explore and furnish innovative opportunities and improvements for the Adelaide CBD in terms of public transport, people movement and infrastructure design opportunities.

  • To deliver the project in packages of work that provide opportunity for local business.

  • To minimise disruption to the travelling public, including passengers, road users and pedestrians during construction.

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DPTI's full Call for Tender has been made available below. 

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CALL FOR TENDER

WINNING TENDER

In response to the Call for Tender, four engineering consultancies submitted Tender Documents. These were E8 Consulting, CityScape Engineers Pty Ltd, Precision Engineers and Maglanas. After assessment of each of the Tender Documents and respective proposals for feasibility study options, DPTI announced the successful applicant as E8 Consulting. The three feasibility study options proposed by E8 Consulting were standouts due to their strategic planning and attention to the scope of the project brief. The first of the three proposed solutions was an additional lane to the Western Hackney Road bridge  and the widening of Hackney Road. The second was a realignment of the existing O-Bahn off-ramp and an elevated superway that travelled over Park Road. The third option was a tunnel that began along Hackney Road, realigning to the West of the Hackney Road bridge and joining back up to the existing O-Bahn bus corridor. 

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Labelled diagrams of each of these options is made available below. 

Option 1

Option 2

Option 3

Tender Stage
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FEASIBILITY STUDY

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Daniel Caddy

Project Manager

Liam Wegener

Assistant Project Manager

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MANAGEMENT TEAM

FEASIBILITY STUDY DOCUMENTS

Quality Management System

Feasibility Study

Report

Environmental Management Plan

PowerPoint

Presentation

Having won the Tender Stage, E8 Consulting drew on the full resources of it's company to complete a Feasibility Study investigating their three proposed options. Each team of experts in E8 Consulting's firm were allocated the task of assessing the feasibility of each option according to their own area of expertise. Both constructability and cost of the three options were taken into consideration when determining each teams perspective of the most appropriate solution. This preliminary investigation ensured that each aspect of the three solutions were carefully considered to determine their impact on the surrounding natural environment and local community.

 

The feasibility study informed DPTI about the affects of each option on local residents, daily traffic and pedestrian flow, surrounding services and infrastructure and historically significant buildings. Risk identification and management was a major factor in this preliminary study. Once each team had provided an analysis of their preferred option, a decision matrix was used to determine E8 Consulting's final suggestion to DPTI. Option 1 was deemed the most appropriate solution in meeting the specific aims of DPTI's project brief, however after presented to DPTI, the client decided they preferred the approach of Option 3, namely the tunnel. DPTI were pleased with the outcomes of the Feasibility Study and were confident with their decision to move forward with E8 Consulting to also complete the Detailed Design stage of the project. 

FEASIBILITY STUDY 

Feasibility Study

DETAILED DESIGN STAGE

Attractive Mature Woman

Liam Wegener

Project Manager

Jason Maddison

Assistant Project Manager

Attractive Mature Woman
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MANAGEMENT TEAM

DETAILED DESIGN DOCUMENTS

Concept Design

Report

Detailed Design 

Report

Environmental Management Plan

Quality Management 

System

Project

CAD Drawings

PowerPoint

Presentation

CONCEPT DESIGN REPORT

Having been awarded the Detailed Design Stage for Option 3 of the O-Bahn City Access Project, it was now E8 Consulting's job to devise a Concept Design Report. This document essentially specified the preliminary scope of what was to be covered in the preparation of the Detailed Design Report. Using the Feasibility Study on Option 3, the new management team came together to establish what aspects of the feasibility study to move forward with and what aspects needed to be revised. The final Concept Design Report detailed the main scope of works to be undertaken by each department and the logistics of completing the Detailed Design Report. A series of CAD drawings and a website to document the process of E8 Consulting's involvement with the O-Bahn City Access project were also considered. Before moving into the final Detailed Design process, a client meeting with Lindsay Doherty as a representative of DPTI was held. This ensured that the main project stakeholder was comfortable with the scope and progression of the project. During this meeting a few main concerns were raised, specifically the quality of air flow through the proposed tunnel and the height of the tunnel bridge over the River Torrens during major flooding events. The mitigation of both these issues were added to the scope of the Detailed Design stage. 

BASIC CONCEPTUAL MODEL OF PROJECT

DETAILED DESIGN REPORT

The current issue in this system lies with the congestion faced once O-Bahn busses merge with general traffic at Park Road Gilberton where significant delays are experienced to general traffic and public transport providers. E8 Consulting in collaboration with the Department of Planning, Transport and Infrastructure have developed a solution primarily featuring a 842m long tunnel that extends south from the end of the existing busway. This will address the current issues, delivering a reduction in travel times for public transport patrons, improve reliability and facilitate an increase in the number of scheduled services. Centrally dedicated O-Bahn bus lanes will be located along Hackney Road to align with the proposed Stage 2 works furthering the connection to the Central Business District(CBD) of Adelaide. Additionally, bus priority at signal controlled intersections will promote a reduction in congestion and maintain traffic flow. Cyclists lanes will be removed from the outbound lane of Hackney Road and integrated with a shared pedestrian/cycle path located within the parklands to the western side of Hackney Road, removing the present interaction between motor vehicles and cyclists.

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E8 Consulting have designed a tunnel that extends from the end of the O-Bahn infrastructure to the southern side of the Cambridge Street intersection on Hackney Road where it will return to grade. The realignment of the city inbound O-Bahn track under Park Road will locate both O-Bahn tracks together in one tunnel. The tunnel then continues under the north bound Mann Road to the west, and Bundeys Road towards the northern bank of the River Torrens. The tunnel remains at a constant depth throughout and then daylights through the river bank providing a clear span across to the southern bank of the River Torrens. The tunnel then continues and passes under the newly realigned Hackney Road outbound lanes, to then resurface between the north and south bound lanes of Hackney Road. Of the 1.6 kilometre section, this design mitigates bus and general traffic interaction by almost half. Additionally, design and constructability has been at the forefront of all solutions to minimise the impact on the local environment and community. A major benefit in this tunnel solution is that it will not inhibit future road network expansion of this traffic corridor.  

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As the design consultants, E8 have strived to develop a solution that not only aligns with the original brief set out in the Tender stage, but many discrete ones that have highlighted the complexity of this unique project. On handover and final commissioning of this project the notable outcomes include, but are not limited to:

  • Reduced delays and operating cost for both the public transport provider and general motorists;

  • Increased O-Bahn patronage which will in turn reduce demand and congestion along the existing road corridor;

  • A reduction in greenhouse emissions due to the shift in transport usage through decreased congestion;

  • Improved air quality to areas immediately surrounding the project location;

  • Community approach to Integrated streetscapes and new bicycle shared path ways;  

  • Showcasing an Innovative renewable pavement and lighting design for the pedestrian and cyclist footbridge;

  • Improved stormwater quality entering the River Torrens using water sensitive urban design schemes.

 

Detailed Design Stage
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Department of Planning, Transport and Infrastructure  

COST

$61,621,880

CLIENT

TENDER STAGE

FEASIBILITY STUDY

DETAILED DESIGN STAGE

O-BAHN CITY ACCESS PROJECT

The O-Bahn City Access project builds on the State Governments 30-Year Plan for Greater Adelaide in delivering a stronger and more efficient high capacity transport network. Currently 80% of public transport is provided by bus movements. The current O-Bahn infrastructure operates along a dedicated bus corridor that spans 12 kilometres from Modbury in the North, to its termination at Gilberton.  The current track supports bus speeds of up to 100km/h, with the capability of transporting 18,000 passengers an hour. Three high volume interchanges are located at Klemzig, Paradise and Tea Tree Plaza which are fed from suburban bus services in conjunction with secure cycle storage and car parking facilities deigned to maximise patronage. This project addresses the public transport pressure point that is 
Hackney Road, and developing the high capacity/high frequency network to it’s potential as part of the 30 year plan.  

 

PROJECT AIMS

  • To Improve the frequency, route extension and priority bus lanes to the O-Bahn section of the public transport system. This is to promote public transport as a viable alternative to private vehicles.

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  • Integration and improvement of heritage infrastructure and parklands throughout the project.

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  • Wherever possible, implement priority features for the O-Bahn and East-West bus services within the Adelaide CBD.

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  • Identify and implement innovative solutions for the public transport system, people movement and infrastructure; consequently, improving public transport to the CBD.

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  • Improve local business by inclusion into the project delivery.

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  • Wherever possible throughout construction, efforts should be made to decrease disruption to road users, public transport patrons, pedestrians and cyclists.

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