In Underground Construction, the Sum of the Parts Is Greater Than the Whole

For every underground construction megaproject, there are many small but critical components that allow the overall project to proceed.

RETC Sets Sights on San Diego

The 2017 Rapid Excavation and Tunneling Conference (RETC) – North America’s largest tunneling event in 2015 – is heading back to San Diego June 4-7.

DRBs in Underground Construction: Past, Present and Future

The use of DRBs on underground projects has increased a great deal in the past 40 years, both geographically and numerically.

SR 99 TBM Emerges into Reception Pit

Bertha, the 57.5-ft diameter TBM building the SR 99 tunnel in Seattle, emerged into the reception pit on shortly before noon local time on Tuesday, completing its almost 2 miles of tunneling. The completion of tunnel boring operations ends one of the most high-profile tunneling projects undertaken in the United States.

Selecting an Underground Drilling Rig

Underground drilling for aggregate is more commonplace than is suggested by all the surface quarries with some 114 underground mines operating in the U.S.

SR 99 TBM Nears Breakthrough

Bertha, the TBM mining the SR 99 tunnel in Seattle, was 219 ft from its end point as of March 27, according to the Washington State Dept. of Transportation.

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