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Autodesk BIM solutions helps give more accurate engineering representation of highway and better understanding of project construction

The challenge

“Roadway construction began in the spring of 2009 and must be completed by the summer of 2012,” says David Owens, an engineer with the Skanska Balfour Beatty Joint Venture. “This means we have to finish construction in approximately half the time it typically takes for a project of this scope.”

This effort is also constrained by the boundaries of the current road. “In addition to adding two lanes, the design incorporates a new central reserve barrier, additional gantries, and new roadside lighting,” says Hugh Woods, a senior group engineer at Atkins. “Therefore, all of these features must fit into the existing boundaries of the M25, which requires precise design and construction coordination.” Furthermore, three lanes of traffic in each direction must be allowed to proceed at all times during construction of the new roadway, necessitating careful construction planning.

The solution

Atkins designers use Autodesk® Navisworks® Manage software to aggregate their multidiscipline design information, which is developed with third-party and Autodesk® AutoCAD® software. The Skanska Balfour Beatty Joint Venture team then uses AutoCAD and Autodesk® AutoCAD® Civil 3D® software to adapt the Navisworks model for construction purposes, adding greater realism and context to the design components. “It’s not about creating pretty pictures,” says Owens. “Autodesk BIM for infrastructure solutions give us a more accurate engineering representation of the highway and a deeper understanding of the project during construction.”

Increase coordination

To help meet their aggressive schedule, the project team relies on a more coordinated, accurate design model. Created in Navisworks, the integrated design model helps the team visualize and coordinate the whole project, including all above-ground and underground components as well as nonphysical aspects of the design, such as safety and access zones. “Navisworks helps us identify and resolve interdisciplinary clashes, many of which would be very difficult to detect using 2D documentation,” says Woods.

Inform decision making

When the design is issued for construction, the project team adapts the Navisworks design model, using Civil 3D to enhance the design intent and create a virtual construction model that incorporates more realistic versions of some of the design elements, such as fences, crash barriers, and retaining walls. The team also adds elements such as point clouds from laser scans, and temporary works. “This construction model makes the project easier to understand for all the on-site staff,” says Woods. “It informs their decisions for construction planning and helps them better understand their options when site conditions necessitate changes.”

“By resolving design conflicts prior to construction, we are reducing costly, time-consuming errors. Autodesk BIM solutions are helping us optimize our design and build the project safely, on time, and on budget.”
        —  Hugh Woods, Senior Group Engineer, Atkins

M25 motorway construction model (at Junction 19). Image courtesy of Atkins & Skanska Balfour Beatty Joint Venture

Stay on schedule

The whole project team, including on-site construction personnel, views the construction model using Autodesk Navisworks Freedom software. “Everyone can use the same up-to-date project information when assessing how best to perform construction tasks,” says Owens. “Navisworks lets us virtually plan our production, helping us meet the project’s fast-track schedule and still maintain ongoing operations on this heavily traveled section of the highway.”

Results

To the relief of the M25 commuters, the project is on schedule for completion before the summer of 2012. “By resolving design conflicts prior to construction, we are reducing costly, time-consuming errors,” says Woods. “Autodesk BIM solutions are helping us optimize our design and build the project safely, on time, and on budget.” The Atkins & Skanska Balfour Beatty Joint Venture received an Autodesk BIM Experience Award for their use of BIM on the M25 project.

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