Articles by rockman

Terracon acquires NORCAL Geophysical Consultants
Press Releases

Terracon Acquires NORCAL, Strengthens West Coast Presence

November 23, 2015 rockman Comments Off on Terracon Acquires NORCAL, Strengthens West Coast Presence

Terracon acquires NORCAL Geophysical ConsultantsOLATHE, Kan. – Terracon, a leading provider of environmental, facilities, geotechnical, and materials engineering services, is pleased to announce the acquisition of NORCAL Geophysical Consultants, Inc. of Sonoma County, Calif. Terracon is retaining NORCAL’s 11 employees.

Founded in 1983, NORCAL offers geophysical technologies in support of geologic, groundwater, environmental, and engineering investigations. NORCAL’s capabilities, including their unique geophysical expertise, complement Terracon’s existing services and broaden the service offerings for clients across the country.

[Editor] Click through for the rest of the press release from Terracon [/Editor]

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Nicholson Construction stabilizes pier on I-65 using micropiles and low-mobility grouting
Press Releases

Nicholson Completes Emergency Work on Indiana’s I-65

November 23, 2015 rockman Comments Off on Nicholson Completes Emergency Work on Indiana’s I-65

Nicholson Construction stabilizes pier on I-65 using micropiles and low-mobility groutingPITTSBURGH, PA – Nicholson Construction recently completed emergency repair work to an unstable pier supporting a bridge on INDOT’s Interstate 65. These repairs enabled a 37-mile section of the highway’s northbound lanes to be reopened after a four-week closure.

The highway was in the process of being rehabilitated and widened when the pier was damaged by steel piles driven into the water tight ground below it. The pier began to settle and eventually rotated ten inches.

Nicholson developed a design-build solution that used micropiles to transfer the loads to more stable soils and low-mobility grouting to fill voids and densify the upper subsurface layer.

[Editor] Read on to hear more about Nicholson’s fix of this unstable bridge pier. [/Editor]

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Braced excavation for Stockholm's City Line project
Project Related

Golder Innovates for Subway Line in Stockholm

November 3, 2015 rockman Comments Off on Golder Innovates for Subway Line in Stockholm

Golder was the geotechnical designer for two of the most challenging segments of the Stockholm City Line in Sweden. Their work included foundation improvements for a tunnel beneath a historic portion of Stockholm, 3D modeling […]

On June 2, 2014, the Delaware Department of Transportation closed a bridge on I–495 that was leaning and out of plumb.
Articles

How Could a Pile of Dirt Cause a Major Interstate Bridge To Tilt?

October 20, 2015 rockman Comments Off on How Could a Pile of Dirt Cause a Major Interstate Bridge To Tilt?

On June 2, 2014, the Delaware Department of Transportation closed a bridge on I–495 that was leaning and out of plumb.[Editor] The Delaware Department of Transportation (DelDOT) had a major problem on their hands after a bridge on I-495 was leaning…one side of the bridge was 18 inches higher than the other.  The culprit?  A pile of fill adjacent to the bridge was loading soft soils beneath.  So what do you do about it?  In this contributed article by Dennis M. O’Shea, bridge engineer in the FHWA Delaware Division Office, he describes the problems faced by DelDOT, the causes, and how they fixed it.  The article originally appeared in Public Roads Magazine, and is republished here with permission. [/Editor]

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