John Hennessy III,
P.E.
Tunnels play an important role in our constructed environment as passageways for mines, conveyance for utilities, and routes for transportation. Rock bolts are a type of reinforcement for stabilizing rock excavations, usually made from steel bars or bolts. This simple construction method dramatically reduces the cost of making tunnels through rock safe from collapse.
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Tell the Congress of the United States to lift the prohibition on tolling interstate highways for the purposes of reconstruction. Give the states the ability to toll their Interstate highways specifically for rebuilding those Interstate highways. Let them have access to one more tool in the toolbox. This is not a mandate; no state would be required to toll their interstates. This simply gives states the flexibility to choose the option to use tolls if it makes sense to the individual state.
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Travelers familiar with Pittsburgh know that any time you visit you are almost certainly going to travel through one of the three main tunnels surrounding the city. The Fort Pitt Tunnel, a resource that is eligible for listing in the National Register of Historic Places, was recently renovated, which impacted this historic resource. As part of the mitigation for this effect, the three-county PennDOT region worked closely with the Pennsylvania Historical Museum Commission and other local groups in Pittsburgh to create a video to capture not only a brief history of the tunnel but to capture the iconic view of traveling through the tunnel and into the City of Pittsburgh.
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Bertha, the SR 99 tunneling machine, reached her stopping point in the SR 99 tunnel access pit on Tuesday night, March 3, 2015. This cleared the way for Seattle Tunnel Partners to begin a disassembly process that will likely take weeks. This time lapse video captures part of her journey into the access pit.
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To reduce DC waste by 98 percent, the 20-year D.C. Clean River Project has a 1323-ton, 442-foot tubular machine digging a 23-foot-diameter concrete water tunnel.
DC Water named its massive tunnel boring machine Lady Bird, christened it with DC tap water, and prepared to send it underground to tunnel more than four miles.
-HugBig on YouTube
This is the tenth in a series of entries celebrating infrastructure achievements in the United States.
The Eisenhower Memorial Tunnel, the highest vehicular tunnel in the world, lies entirely within the Arapaho National Fores…During construction approximately 1 million cubic yards of material was cleared from each bore. 190,000 cubic yards of concrete was used for each tunnel lining.
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Tunnels are safe structures. Every day many tens of thousands use them without incidence. However, tunnel safety cannot be taken for granted.
Tunnel Engineers from throughout the USA will come together to share individual, practical experiences and will join an audience of leading contractors and cutting edge solution providers to identify best practice in the design and operation of tunnels across the country.
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