#Core tunnel project full
#Core tunnel project portable

#Core tunnel project full

A summary report was prepared which included full descriptions of the core, videologs, and recommendations for rehabilitation of the tunnel.ДA Smith later conducted additional core drilling to confirm the effectiveness of remediation grouting. The coring tools used were NW conventional, 2.06-inch-diameter core, and 2.985-inch-diameter borehole.Дrilling was completed with zero discharge of drilling fluids. DA Smith mobilized core-drilling equipment to characterize the ground conditions behind the shotcrete lining and to provide a basis for design of the remediation of the cross passage.ДЄ total of 15 continuous core holes were drilled horizontally into the rib, at +45В° into the spring line, and vertically into the roof of the tunnel cross passage. Field Services) completed core drilling in support of rehabilitation of Cross Passage 5 in the Colorado Department of TransportationвЂ™s Hanging Lake Tunnel near Glenwood Springs, Colorado. In 2010, DA Smith (formerly Agapito Associates, Inc. Work was completed successfully within a tight operating schedule. Special care was taken to preserve cores for later engineering analysis. The deeper holes were pressure grouted upon completion to restore the hydraulic integrity of rock mass surrounding the tunnel. Immersed tunnel execution involves our core activities of. A second drill was used to sample multiple, shallow 4вЂ‘inch-diameter cores through the tunnelвЂ™s concrete liner. Construction is technically complex and involves an extreme. The rock mass was cored (HQ3 diameter) at multiple locations along the tunnel alignment to characterize surrounding rock mass properties.

#Core tunnel project portable

The drills were powered by portable diesel-electric power packs. DA Smith fabricated customized drill trailers and modified two existing underground drills to fit through the tunnelвЂ™s constricted penstock entrance and operate inside the confined space of the small-diameter tunnel. Field Services) conducted specialized around-the-clock core drilling for tunnel stability assessment inside a 9-mile section of a major northern California metropolitan water supply tunnel (confidential identity). In 2017, DA Smith (formerly Agapito Associates, Inc.