CIV4ID Infrastructure Design : Economic Growth

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CIV4ID Infrastructure Design

Task:

1 Introduction :

A state highway, known as Main Highway, currently passes through Mainville, a growing rural centre with a population of 45,000. As a result of the township’s economic growth, the traffic using the highway has increased, leading to moderate to severe delays. The increased traffic has had negative environmental and social impacts for the residents of Mainville and recently there have been several accidents involving vehicles and pedestrians.

2 What you need to do : 

In response to these problems, the Department of Transport commissioned a study that concluded the solution was to construct a new two-lane two-way road to bypass Mainville. You have been contracted as a consultant by Department of Transport to design a route for this new Mainville bypass. The route must be designed to provide for the safe and efficient movement of vehicles around Mainville while keeping construction costs, land acquisition and environmental impacts to minimum levels. Working in a group, your task in this preliminary design phase is to propose, design and evaluate alternative alignment(s) for the new bypass. The design must comply with Austroads standards, e.g. Austroads Guide to Road Design. More information about the design project can be found in the Frequently Asked Questions file on LMS.

3 Preliminary Design Methodology

3.1 Stakeholder identification You are initially asked to identify stakeholders who are likely to be affected or influence the road project, with relevant justifications.

3.2 Initial route identification Your first key design task is to identify THREE routes for preliminary design evaluation. The rationale for initial route selectionis at your discretion but clearly you will need to consider restraints imposed by the topography of the site, the township itself, the environmentally sensitive areas and the costs of construction.

3.3 Alignment design

a) Develop the alignment(s) for the bypass route(s) having regard to the co-ordination of horizontal and vertical alignments and the technical, environmental and social design constraints. This will involve the selection and computation of horizontal alignment geometry and vertical curve design making proper provision for sight distance and requires consideration of curve radius, super-elevation development, transition length, vertical curve length and geometry, grades etc.

• You should use Civil 3D for designing the alignment and generating drawings. Note that Road Project Map CAD file (.dwg) is available on LMS, in which the existing ground surface was already coded.

• However, you MUST also provide manual calculations for horizontal and vertical curves. Other design checks, e.g. curve radius, super-elevation development, transition length, vertical curve length, maximum grades, design form etc, MUST also be discussed.

b) Set chainage points at 20m intervals commencing at the take-off point. Note that for this exercise, the design line shall be the centreline.

c) Calculate earthwork quantities using the 20m-interval cross-sections over the length of the road using Civil3D. Draw the mass-haul diagram (in scale) and discuss its properties. You can either draw the mass-haul diagram using Excel or Civil3D. d) Prepare scale drawings of:

• The plan, showing horizontal curve details and cut-and-fill extremities.

• The longitudinal profile along the design line showing vertical grading details and cut-and-fill requirements.

• 4 ‘typical’ cross-sections (e.g., a tangent, curves, through the rock, etc.) for each route. Drawing requirements are presented in APPENDIX A.

3.4 Evaluation

a) Compute the 20-year cost of the road on the basis of costs advised by the Department of Transport (proposed bypass and no build). This will include construction, acquisition, environmental, social and operations and maintenance costs. Relevant data can be found in Road Project Data Excel file.

b) Conduct a detailed economic evaluation using the NPW, benefit/cost ratio and incremental benefit/cost ratio methods.

c) Discuss social and environmental impacts

3.5 Recommendation On the basis of this analysis, recommend whether your chosen option should go forward for final design.

4 Deliverables Prepare a report of your preliminary designs and recommendation, which should be structured as shown in Table 1.

Table 1 Report structure Title page Title of project, subject, lecturer, date, your name & group number Executive Summary An Executive Summary briefly introducing the problem, stating your design aims, evaluating the options, and stating your recommendations (max. 1 page).

5 Table of Contents Word will generate this automatically if you use Heading styles. Introduction A more complete introduction to the problem than you provided in the Summary (max. 1 page)

5 Stakeholder – Determine who will be affected or influence the road project 5 Route Alignments & Design Checks – Brief description of the route and your rationale for its consideration.

– Calculations for geometric design features such as horizontal curve radii, super-elevation development, transition lengths, vertical curve radii and vertical curve staking.

– Checks on design controls (curve radii consistent with operating speeds, sight distance maintained, coordination of horizontal & vertical alignments). 25 – Earthworks calculations and mass-haul diagram.

– Scale drawings of the plan of your alignments annotated with information such as ground surface (e.g., marsh, rock, earth etc.), chainage, curve radii, superelevation development length etc.

– Scale drawings of the profiles of your alignments annotated with information such as ground surface, chainage, grade, vertical curve radii, and indications of cut/fill.

– Scale drawing of 4 “typical” cross-sections 15 Route Evaluations – A detailed economic evaluation of the options, bypass alignment(s) vs no build, using the NPW, BCR, and incremental BCR methods (tables are the best way to present and summarise this information). – Discussion of the environmental/social impacts.

1. PLAN Information to be shown on drawing:

• Scale • North arrow • Chainages including tangent points • Road centreline (and edge of pavement if possible) • Batter details i.e. limits of earthworks • Curve details including radius, tangent length, intersection angle, length of transition spiral. • Right of way

2. PROFILE Information to be shown on drawing:

• Scales • Chainages • Natural surface centreline levels • Design road centreline levels • Grades and vertical curves • Vertical curve data including length, intersection point chainage and level, middle ordinate height.

3. CROSS SECTIONS Information to be shown on drawing:

• Scales • Chainages of cross sections • Road centreline • Natural surface details • Design road cross-sections including centreline and edge of pavement levels • Dimensions, standard cross-falls of pavement, shoulders, batters etc., to be shown. For non-standard cross sections (e.g. superelevated sections of road around curves) the varied details from standard (e.g. pavement cross fall on curve) to be shown.

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