PND Engineers marks its 40 anniversary in August. The company was established in Anchorage in 1979 by Roy Peratrovich, Jr., and Dennis Nottingham, and specializes in civil and structural engineering, roads, geotechnical engineering, river hydrology, coastal and marine work, surveying, and the design of bridges, buildings, and other structural systems. PND is headquartered in Anchorage, Alaska, with offices in Palmer and Juneau, Alaska, Seattle, Wash., Portland, Ore., Houston, Texas, and Vancouver, B.C., Canada. Sample signature projects designed by th the firm include the Juneau Cruise Ship Docks and Unalaska and Kodiak container terminals in Alaska; Tudor Road Trail Crossing and Clark Middle School in Anchorage; the CD5, Liberty, Northstar and Point Thomson developments on the North Slope, Alaska; and the Bell Street Pier in Seattle. Research and development over the GUNDERBOOM environmental barrier SHEET PILE technology, SPIN FIN piles, ™ ™ BRIDGE design. The firm’s work has received numerous system, and the FreeSpan STRAND ™ awards including the DFI Outstanding Project Special Recognition Award in 2001 for the Bell Street Pier project in Seattle, Construction Innovation Forum’s NOVA PILE bulkhead technology and the Associated General Contractors of America’s Aon Build America Award in 2010 for the Umm Qasr pier and seawall project in post-war Iraq. Award in 1998 for OPEN CELL SHEET ™ Pile Dynamics (PDI) has introduced the Shaft Area Profile Evaluator (SHAPE). The new product offers quality control of radius, volume and verticality for drilled shaft foundations. It has been well documented that drilled shafts are rarely ideal cylinders and irregularities in the shaft construction can affect shaft performance. SHAPE is a cost-effective quality assurance testing device used for deep foundations (drilled shafts, bored piles, slurry walls, barrettes, etc.) to characterize the three-dimensional profile of these and other excavated deep foundation elements. SHAPE provides a fast, economical representation of the foundation excavation and verticality prior years has led to patents for OPEN CELL ™ through #11. The Adjustable UNIBAR is designed to keep the reinforcing tendon/ bar centered in an 8 in (203 mm) diameter bore hole. ® UNIBAR Centralizers are made of ® durable, noncorrosive plastic consisting of two identical halves that are fast and easy to snap together. They accommodate a wide range of rebar and tendon sizes. As an example, centralizers with a 4 in (101 mm) O.D. fit rebar sizes #5 through #20. To facilitate the installation process, Pier- esearch provides easy-to-follow assembly to placing concrete in wet conditions. SHAPE’s drilling stem advancement rate is approximately 1 ft/sec (300 mm/sec), offering simplicity in analysis with a clean signal and 3D profile views. It is a completely wireless device, requiring no electronic cabling from the surface to the device during operation. This increases overall system reliability. The device automatically corrects for changes in wave speed with depth by measuring the wave speed at each measurement location along the length of the excavation and adjusting the radius calculation based on the measured wave speed at any depth location. SHAPE samples al l eight sensors simultaneously at a high rate of speed, allowing the SHAPE to be quickly deployed and construction to continue at a rapid rate. remotely with PDI’s SiteLink technology. The SHAPE can be operated on site or ® Pieresearch, a leading manufacturer and distributor of centralizer products for reinforcing cage alignment and support in geo-construction construction, recently its UNIBAR Centralizer, a revolutionary alignment device used in the installation of tiebacks, soil nails, micropiles, augercast piles and other earth retention and deep foundation support elements that employ a Lock UNIBAR . It has an adjustable hub that accommodates rebar sizes from #6 to the UNIBAR line is an Adjustable Quick ® single bar or tendon. The newest addition ® received a U.S. Patent (No., 1,051,113) for ® and placement guidelines. UNIBAR Centralizers are lightweight, easy to assemble and can be attached with zip ties or tie wire. No nuts or bolts are required for installation. They are offset to fit between rebar thread, and they are economical. ® A Liebherr LRB 355 was used to install 1,879 foundat ion pi les using ful l displacement drilling equipment for the expansion of the “El Salitre” wastewater treatment plant in Bogotá, Columbia. The plant, which currently services nearly 2 million inhabitants, is being upgraded to reduce the pollution of the Río Bogotá and sensibly reuse the treated water. In total, about 62,000 m of 600 mm (23.6 in) DEEP FOUNDATIONS • JULY/AUG 2019 • 109
