Dulles Corridor Metrorail Extension

Brayman’s scope of work required installation of deep foundation systems for the elevated guideways and stations. Overall, the crew drilled 724-each caissons, ranging in diameter from 2-foot to 10-foot. Drilling methods included both conventional temporary casing and drilling slurry. All shafts were MiniSID inspected for cleanliness and CSL tested for concrete integrity. Brayman performed eight static load tests, utilizing Oesterberg load cells and five statnamic load tests over the course of the project. Our team furnished and installed reinforcing cages and concrete; maintained complete quality control for all services; and managed/ disposed of drill spoils. This project involved working in congested areas and had significant environmental controls in place. Brayman was able to complete the work within 18 months, six months ahead of schedule, working over 120,000 man hours with no recordable incidents. SECANT PILE WALLS – Brayman was awarded a change order for the installation of four secant pile walls, one on either side of two existing culverts, in order to provide lateral protection. Walls consisted of 48-each, 30-inch diameter primary piles ranging in depth from 16-feet to 19-feet and 44-each, 24-inch diameter secondary piles ranging in depth from 16-feet to 19-feet. . Brayman also provided layout, spoils removal, concrete testing, and furnishing of flowable fill from cutoff elevation to the top of the existing ground.