Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  478 - National Center Sanitary Sewer Project

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Shaft Work Steel/Wood Crystal City, VA Arlington County, VA Sand, Clay 1890' x 68" Ø
SUMMARY: The primary jacking pit on the NCSS project was a 30' deep, 26' diameter shaft supported by steel ribs and wood lagging. The shaft was installed in primarily sandy, dry conditions with interspersed layers of hard clay. One of the main challenges involved in the shaft installation was the presence of a manhole intersecting the shaft. The manhole remained from a previous drilled shaft... Complete Project Profile