Pioneering Percussion Driven Earth Anchors (PDEA®) for over 40 Years


Winston Salem State University – North Entry Parking – NC, USA

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Project Overview

To provide much needed access to two remote parking lots at Winston Salem State University, a bridge was built that will cross over an existing rail line and connect the lots to the main campus. The owner of the railroad, Norfolk Southern, would not allow the newly built bridge to be accessed until an adjacent abutment that had begun to slough was reinforced. The railroad felt there was a risk that the vibrations caused by passing trains could lead to a shallow plane failure.

Project Solution

The Platipus ARGS® (Anchor Reinforced Grid Solutions) system was specified by a local Geotechnical Engineer who was very experienced in the local geology of the Piedmont region. Summit Design and Engineering performed a global stability analysis and concluded that the depth of failure was approximately between 5 – 10 feet deep. The design included a grid patterned of 2 TN anchors being driven to a minimum depth of 15′ and pre-tensioned to 2,000 lbs. After all the anchors were tensioned, the slope was covered in a 4” thick reinforced concrete face including a 4”x4” welded wire mesh. The load plates and wedge grips were post tensioned to the concrete face once the concrete facing had cured.

Anchor System: S6A 2TN ARGS®

Quantity: 90      Soil Type: Partial Weather Rock

Winston Salem State University Slope under bridge secured with Platipus earth anchors

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