ITE Journal July 2018 - 37

Figure 5. Road completion of TH 169 looking south.
evated curve (Figure 2) and a model replicating a 100-year flood
event verified the proposed freeboard of the roadway (Figure 3). The
3D design information was also easily transferred to the contractor
who used it for stakeless grading of the select granular, aggregate
base, pavement bottom, and final slope grading surfaces.
In addition to the stakeless grading surfaces, the concrete
pavement was constructed using a stringless paving process. This
process was achieved by extracting 3D polylines at each lane line
from the design and setting up adjacent control stations in the field
to communicate with the concrete paver (Figure 4). By providing
the paving contractor the extracted 3D polylines from Corridor
Modeler directly, we achieved far greater accuracy than standard
roadway design methods. This process allowed the paving machine
to travel along virtual edges.
Although stringless paving is relatively new to Minnesota
construction, it has been used extensively in neighboring states and
across the country. To date, there have been few stringless concrete
paving projects in Minnesota; all were constructed by out-of-state
contractors. Stringless paving technology allowed the contractor
to be ready for paving in any area of the corridor, within hours, not
days, because they were no longer reliant on surveyors to set up
stringlines days in advance.

New technologies and innovative processes were essential to
completing this project in an aggressive eight-month timeframe-
with only 18 weeks under a full closure and detour. MnDOT, the
consultant staff, and the contractor representatives worked together
to provide the necessary design data, survey control, and machine
control expertise to deliver this critical infrastructure and economic
improvement project. This project has set a precedent. Future projects
must strive to implement new design and construction technologies
in an effort to improve design and construction outcomes. itej
Derek J. Arens is a project design engineer with
Bolton & Menk. He has been responsible for preliminary and final roadway and intersection design
layouts, cost estimates, and assembling construction
plans and specifications since starting as a roadway
design engineer in 2011. He has experience on a
variety of municipal, geotechnical, traffic, and transportation
projects including roundabouts, signing and striping, access
management, retaining walls, pedestrian, biking, and trail projects.
Derek is passionate about helping bring client's visions to life with
the 3D design aspect of roadway design technology. Derek is a
member of ITE.
w w w .i t e.o r g

J u ly 2018

37


http://www.ite.org

Table of Contents for the Digital Edition of ITE Journal July 2018

ITE Journal July 2018 - Cover1
ITE Journal July 2018 - Cover2
ITE Journal July 2018 - 3
ITE Journal July 2018 - 4
ITE Journal July 2018 - 5
ITE Journal July 2018 - 6
ITE Journal July 2018 - 7
ITE Journal July 2018 - 8
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ITE Journal July 2018 - 37
ITE Journal July 2018 - 38
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ITE Journal July 2018 - 50
ITE Journal July 2018 - Cover3
ITE Journal July 2018 - Cover4
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https://www.nxtbook.com/ygsreprints/ITE/G108559_ITE_August2019
https://www.nxtbook.com/ygsreprints/ITE/G108250_ITE_July2019
https://www.nxtbook.com/ygsreprints/ITE/G107225_ITE_June2019
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https://www.nxtbook.com/ygsreprints/ITE/G100155_ITE_December2018
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