國(guó)外濱水開發(fā)波士頓 Boston big dig

1、Boston Big Dig-BackgroundThe problemsBoston, Massachusetts had a world-class traffic problem, an elevated six-lane highway called the Central Artery that ran through the center of downtown. When it opened in 1959, the Central Artery comfortably carried about 75,000 vehicles a day. It has carried upw

2、ards of 200,000, quite uncomfortably, making it one of the most congested highways in the United States.And traffic wasnt the only problem the old Central Artery caused in Boston. The elevated highway (which displaced 20,000 residents when it was built) also cut off Bostons North End and Waterfront

3、neighborhoods from the downtown, limiting these areas ability to participate in the citys economic life. 1Boston Big Dig - SolutionsThe projects two major components: Replacing the six-lane elevated highway with an eight-to-ten-lane underground expressway directly beneath the existing road, culminat

4、ing at its northern limit in a 14-lane, two-bridge-crossing of the Charles River. After the underground highway opened to traffic, the crumbling elevated wasdemolished and in its placewill beopen space and modest development. The extension of I-90 (the Massachusetts Turnpike) from its former terminu

5、s south of downtown Boston through a tunnel beneath South Boston and Boston Harbor to Logan Airport. The first link in this new connection- the four-lane Ted Williams Tunnel under the harbor- was finished in December 1995. The new bridge replaced a deteriorating six lane double-deck bridge that was

6、demolished in spring 2004. 2The .75-mile underwater part of the 1.6 mile tunnel was built using a dozen steel tube sections, each longer than a football field, that were sunk into a trench on the Boston Harbor floor and connected togetherThe underwater portion of the tunnel is actually made up of tw

7、elve binocular shaped steel tubes.Now that connections to the Massachusetts Turnpike (I-90) and Route 1A are in place, use of the tunnel is open to all vehicles. Unlimited use of the tunnel for all began in mid-January 2003 upon the opening of the Mass Pike extension, which connects to the Ted Willi

8、ams Tunnel. Solutions - Ted Williams Tunnel3Boston Big Dig - Open SpacesNashua Street ParkThe Central Artery/Tunnel Project is creating about 40 acres of park and recreational space along the Charles River Basin. This aerial view shows the 2.5 acre Nashua Street Park, set to open in September. Open spa