SPS New England Completes Design-Build in 92 Days
   Geocomp’s Efforts Aid in Fast-tracked Schedule
Constructed in 1909, the Pleasant Street Bridge, which spans the Blackstone River in Grafton, Massachusetts, is designated an historic structure. During rebuilding in 2007, large lateral movement occurred within the stone arches, causing a halt to work and construction plans to be revised. In 2009 the Massachusetts Highway Department (MHD) issued a design-build contract to reconstruct the bridge to match the original historic structure.

Geocomp Consulting was selected as the geotechnical engineering firm to provide foundation designs for the new twin-arch structure. Unique features of the project included horizontal forces greater than vertical forces on the foundations, very deep design scour depths at the foundations, re-use of existing pilings, and very small allowable deflection for the new


The New Pleasant Street Bridge

precast arch sections. The bridge was also to be designed using LRFD design (MHD Draft Bridge Manual Supplement 7/24/08).

The design of the bridge’s pile-supported foundation was complicated by extreme scour requirements. Geocomp Consulting developed a computer model of the bridge foundations to predict the deflections. These predictions demonstrated to MHD that the arch

design using the existing piles supplemented with additional piles was a safe and efficient design and resulted in significant benefits to the client. “Geocomp performed the geotechnical design tasks for the Pleasant Street Bridge with superior skill in a difficult design-build environment. Their understanding of the issues and grasp of the design-build methodology provided SPS with confidence and the ability to complete the project in just over three months. Geocomp is a valued team member,” stated Senior Vice President of SPS New England Robert Gemmell.

Geocomp’s engineers used soil interaction methods to optimize the design and allow SPS to reach completion of the project in 92 days.

   Who's New
Cory Baldwin is Geocomp’s new Geomatics director. Mr. Baldwin has played a critical role in the use of global positioning systems (GPS) sensors for real-time deformation monitoring. He has worked on a series of successful software and hardware development programs that have pioneered the use of GPS in a range of applications. Mr. Baldwin has managed the successful completion of projects worldwide, including slope stability monitoring, dam performance monitoring, oil field subsidence monitoring, block cave monitoring, volcano behavior characterization, bridge health monitoring, and bridge and tall building construction alignment.

Mr. Baldwin has also worked on the development of a high-reliability differential GPS system for Boeing Integrated Defense Systems which included the design of a broadcast system which, when deployed anywhere in the world, would automatically initialize, calibrate, and provide a continuous and redundant stream of differential GPS correction messages for nearby aircraft exceeding 99.99% reliability.

Mr. Baldwin is currently working on applying new signal processing techniques to discrete GPS measurements in an effort to increase the precision of real-time GPS for dynamic monitoring applications. By modeling the deviating mean associated with changing satellite geometry and multipath – it may be possible to achieve precision close to the statistical noise inherent in the GPS system. Further development and application of this technology for monitoring will create many new exciting applications for GPS and associated services that Geocomp will be able to offer owners and operators of key infrastructure around the world.

Daniel Kippelen joins Geocomp’s Consulting Division as its Midwest Regional Manager. His responsibilities include building business relationships with new and prospective clients, managing projects, and assisting other offices in technical applications.

A native of France, Mr. Kippelen has an extensive background in electrical and mechanical engineering with emphasis on industrial instrumentation. After moving to the United States in 1999, he largely contributed to the success of the

newly created CMR-US, a French-owned company specializing in sensors, wiring harnesses, and control systems for large industrial diesel engines, as well as complex alarm and monitoring systems for ships. Before that, Mr. Kippelen worked for ten years at CMR headquarters, where he managed the engineering department, creating most of their current sensors and advanced engine wiring systems.

Before joining Geocomp, Mr. Kippelen was the general manager at SolData Inc., a US subsidiary of another French company known in Europe and Asia for automated geotechnical instrumentation. Based in Pennsylvania, he managed all aspects of the day-to-day and long-term operations, including sales, financials, and reporting, in addition to fulfilling responsibilities for installation and maintenance of instrumentation sites.

Daniel is married, has a daughter and son attending the University of Pittsburgh, and enjoys hiking, mountain biking, fixing cars and motorcycles, and home improvement projects.

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September 2009