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DentistryDr.com - Grand Canyon Dentists in Grand Canyon, Arizona dentistrydr.com | Grand Canyon endoatlas.com | Grand Canyon State Chapter Membership azradiologyrn.net |
Coordinates: 36°0′44″N 113°48′40″W / 36.01222°N 113.81111°W   The Grand Canyon Skywalk is a tourist attraction along the Colorado River on the edge of the Grand Canyon (Grand Canyon West) in the U.S. state of Arizona. It was funded by the Hualapai Indian tribe in partnership with Chinese-American businessman David Jin.[1] The horseshoe-shaped glass walkway stands at a 3,600 feet (1,100 m) height above the floor of the canyon, a height exceeding those of the world's tallest skyscrapers.[2] The Skywalk is not directly above the main canyon, Granite Gorge, which contains the Colorado River. Instead it extends over a side canyon and affords a view into the main canyon.[3] USGS topographic maps show the elevation at the Skywalk's location as 4,770 ft (1,450 m) and the elevation of the Colorado River in the base of the canyon as 1,160 ft (350 m), and they show that the height of the exactly vertical drop directly under the skywalk is between 500 ft (150 m) and 800 ft (240 m).[4] Commissioned and owned by the Hualapai Indian tribe, it was unveiled March 20, 2007, and opened to the general public on March 28, 2007. It is accessed via the Grand Canyon West Airport terminal or a 120 mile (190 km) drive from Las Vegas, which includes a 10 mile stretch of dirt road which is currently under development.
[edit] Technical achievement
David Jin, an Entrepreneur who had been involved with tourism and the Hualapai Nation for some time, had the idea of extending a platform out over the edge of the Grand Canyon. With the help of architect Mark Ross Johnson, that idea evolved into a rectangular walkway and eventually the “U” shaped walkway that has now been constructed. The overall Skywalk width is 65 feet. The Skywalk length extending out from the post supports closest to the canyon wall is 70 feet. The outer and inner 32 inch wide by 72 inch deep bridge box beams are supported by (8) 32 inch by 32 inch box posts having (4) post on each side of the visitor’s center, once completed. The (8) posts are anchored in pairs into four large concrete footings that are in turn anchored to the bedrock by (96) 2-1/2 inch diameter DYWIDAG (acronym pronounced Doo-Wee-Dag) high strength steel threaded rod rock anchors grouted 46 feet deep into the rock. The deck of the Skywalk has been made with (6) layers of Saint-Gobain Diamant low iron glass and DuPont SentryGlas. Deck width is 10 foot 2 inches. The Skywalk glass railings were made with the same glass as the deck but fewer layers (3) bent to follow the walkway’s curvature. The glass railings are 5 feet 2 inches tall and have been designed for high wind pressures. The Skywalk was assembled on top of the canyon wall in line with its final placement and moved into final position by a jack and roll rig. The Skywalk infrastructure itself weighs a little over 1,000,000 pounds without counterweights but including the tuned mass dampers, railing hardware, glass rails, glass deck and steel box beams. At the time of roll-out, the Skywalk weighed approximately 1.6 million pounds. The process was completed in two day days. The Skywalk deck was designed for a 100 pound per square foot live load along with code required seismic and wind forces. Fine-tuning of the project occurred after a wind loading and pedestrian induced vibration analysis. Two tuned mass dampers were installed inside the outer box beam as well as one inside the inner box beam at the furthest extension of the Skywalk to reduce pedestrian footfall vibration. The walkway could carry (822) people that weigh 200 pounds each without overstress but maximum occupancy at one time is 120 people. Structural design was provided by Lochsa Engineering out of Las Vegas, Nevada. Contractor is Executive Construction Management also located in Las Vegas, Nevada. Foundation design was aided by John Peck (Geologist), Aaron Hastings, P.E. of Arroyo Engineering Consultants, Inc. (Geotechnical Engineer), DJ Scheffler, Inc and Crux Subsurface, Inc. Astronauts Buz Aldren and John Herrington attended the Opening Ceremony on March 20, 2007. [edit] Cornerstone of a larger planAccording to Hualapai officials, the cost of the Skywalk was $31 million.[5] Future plans for the Grand Canyon Skywalk complex include a museum, movie theater, VIP lounge, gift shop, and several restaurants including a high-end restaurant called The Skywalk Café where visitors will be able to dine outdoors at the canyon's rim. The Skywalk is the cornerstone of a larger plan by the Hualapai tribe, which it hopes will be the catalyst for a 9,000 acres (36.42 km2) development to be called Grand Canyon West; it would open up a 100 miles (160 km) stretch along the canyon's South Rim and include hotels, restaurants, a golf course, and a cable car to ferry visitors from the canyon rim to the Colorado River, which has been previously inaccessible.[5] [edit] Controversy[edit] HualapaiOpponents within the tribe view the project as disturbing sacred ground.[1] Supporters within the tribe counter that it is an opportunity to generate much-needed cash to combat serious problems that plague the small 2,000-resident reservation, including a 50% unemployment rate, widespread alcoholism, and poverty.[5] Other tribal members are happy with the Skywalk, but they have expressed concern over future over-development. They are also concerned about the potential lack of sustainability because the water used in both the development and the neighboring Grand Canyon National Park is not taken from the Colorado River but piped or trucked in from elsewhere.[5] [edit] Environmentalists and othersPeople outside of the tribe, including Arizona environmental groups and former National Park officials, have expressed concern about the project's obtrusiveness in the natural environment, considering it a defacement of a national treasure. Some have suggested it is ironic that the Hualapai had argued they were the best caregivers and stewards of the Grand Canyon, and yet decided to exploit it in this way.[5] Tribal leaders counter that the 4.5 million people a year who visit the National Park portion are already overburdening an area and, further, that the tribe needs financial income. The tribe's 1 million-acre (4,000 km²) reservation attracts approximately 200,000 visitors a year and charges for rim-side weddings and stunt jumps, including one by Robbie Knievel. The tribe made a foray into opening a casino but it has not been able to generate sufficient income.[5] [edit] Access and ProtectionAccess to the Skywalk can be made from Las Vegas, NV in the North or Kingman, AZ in the South, via Highway 93. Both routes converge near Diamond Bar Road. Diamond Bar Road, as of Dec 7, 2009 is under construction. It consists of 10 miles of an ungraded gravel and dirt road. The Skywalk remains open in rain and snow conditions, though in these cases carpeting is installed for visitor safety. These mats do not obscure any visibility that isn't already obscured by the stationary box beams. . In an effort to protect the glass, the Skywalk has implemented a policy barring personal equipment (cameras, cell phones) on the Skywalk. They do provide lockers free of charge. Visitors are also issued fabric shoe covers which slide over their shoes just before walking out onto the Skywalk.The 46 glass floor panels reportedly have a production cost reaching $250,000 each and can be scratched or damaged by falling metal objects. Photographs are taken on the bridge via stationary installed cameras, which may be purchased later in the gift shop.[6] [edit] Gallery [edit] References
[edit] External links
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