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ABSTRACT Application of Fiber Reinforced Concrete (FRC) as the primary constitutive material of segmental tunnels is considered a feasible option in modern tunneling projects. The design of underground tunnels in [...]

Taking Precautions On Mined Tunnel Easing a 13-degree curve into 4 degrees takes more than a great design A head of deadline, joint venture contractors Ohbayashi Corp., San Francisco, and [...]

Tunnelling Just Feet Below Busy Interstate To bore twin train tunnels near Atlanta, a microtunneling pioneer is relying on some state-of-the-art construction techniques, bolstered by a lot of old-fashioned teamwork. [...]

Loren Faulkner If traffic is always tight in San Francisco, it has been more so since August 27th as Caltrain Bayshore & Paul Street Tunnels work began. When work for [...]

By Paul Fournier Testa Corporation demolishes '50s-era elevated highway as Big Dig opens Now that Boston's $14.6-billion Central Artery/Tunnel (Big Dig) has been opened to traffic, dozens of construction machines [...]

For pure sophistication, the tunnel through Mt. Baker Ridge casts a long shadow over the other major projects in the construction of I-90 at Seattle. For starters, the design and [...]

Morrison Knudsen Interbeton White is overseeing the construction of the four-lane vehicular tunnel tube which will connect South Boston to Logan Airport. Bethlehem Steel Corp. manufactures the keel concrete for the tubes while Symons Corp. produces the tube linings. Albion Industries provides the special casters that support the tubes. The project requires a total of 12 twin-tubes, each measuring 160 ft. in length, to complete the floating the tunnel., One of the largest new construction projects in the United States is the vehicular tube tunnel that runs from South Boston to Logan Airport. The massive four-lane tunnel uses 12 [...]

Planning and Coordination Key Underwater Tunnel Communications, planning and reliable equipment paved the way for successful completion of a $78 million tunnel under the Elizabeth River between Norfolk and Portsmouth, [...]

Company Revamps For Change and Growth After building profitably to a business volume of $40 million a year, Traylor Bros., Inc., Evansville, Ind., has divisionalized for more growth. River work [...]

Remote Mock-Up Helps Plan Tunnel Work A full-scale wooden mock-up of a tunnel section is helping Traylor Bros., Evansville, Ind., check working conditions for a project in Singapore, 12,000 miles [...]

Roadheader Mines Soft Rock For New Highway Tunnels A German-manufactured roadheader is carving its way through a pair of 600-ft.-long, soft rock tunnels for Interstate 70 in Colorado. Roadheaders have [...]