
Donghai Bridge (simplified Chinese: 东海大桥; traditional Chinese: 東海大橋; pinyin: Dōnghǎi Dŕqiáo; literally "East Sea Grand Bridge") was the longest cross-sea bridge in the world and the longest bridge in Asia until Hangzhou Bay Bridge opened on 1 May 2008. It was completed on December 10, 2005. It has a total length of 32.5 kilometres (20.2 miles) and connects mainland Shanghai and the offshore Yangshan deep-water port in China. Most of the bridge is a low-level viaduct. There are also cable-stayed sections to allow for the passage of large ships, largest with span of 420 m.
Controversy
An article on infrastructure investments in China in The Economist magazine claims, "Shanghai has had a tendency in recent years to spend big money on projects of questionable value...."
The investment in the Donghai Bridge and the new deep water port at Yangshan might have been better spent expanding the existing deep water port at nearby Ningbo. The Hangzhou Bay Bridge will make Ningbo even more accessible to Shanghai.
Hangzhou Bridge China


The twinned towers of the bridge, from the northbound span
Hangzhou Bay Bridge (simplified Chinese: 杭州湾大桥; traditional Chinese: 杭州灣大橋; pinyin: Hángzhōu Wān Dŕqiáo), is a bridge with cable-stayed bridge portion across Hangzhou Bay off the eastern coast of China. It was linked up on June 14, 2007,[1] and connects the municipalities of Shanghai and Ningbo in Zhejiang province. The bridge is the longest trans-oceanic bridge in the world, although it does not have the longest cable-stayed main span. The opening ceremony was held on June 26, 2007 with great domestic media publicity, though after the opening ceremony, the bridge would only be used for test and evaluation purposes. It was opened to the public on May 1, 2008.
Description
Construction of this bridge started on June 8, 2003. The bridge itself is 35.673 kilometres (22 mi) long with six expressway lanes in two directions, making it the second-longest bridge in the world after the Lake Pontchartrain Causeway in Louisiana, USA. The bridge has two main spans, with a 448-metre (1,470 ft) northern span, and a 318-metre (1,043 ft) southern span.[3] The designated speed is 100 kilometres per hour (62 mph), and the designed longevity is more than 100 years. The total investment on the bridge was RMB 11.8 billion (US$ 1.4 billion as of December 2004). 35% of this amount was raised from private companies in Ningbo, 59% was provided as loans from China's central and regional banks. Orthotropic steel deck is used on its main spans and five ramp bridges, and was paved with 50 millimetres (2.0 in) epoxy asphalt concrete. The bridge is shaped in an 's', so that the annual silver dragon is minimully affected. The length of the bridge is decorated with flashing lights of different colors to distract from drowsiness, and keep attention on the road instead.
History
The bridge underwent various feasibility studies for a decade before it was finally approved in 2003. The original plan was for the northern end of the bridge to start at Jinshan, a suburb of Shanghai. After objections were raised by the Shanghai Municipal Government, however, it was shifted south to the territory of Zhejiang province. The Hangzhou Bay Bridge connects Cixi City, west of Ningbo, to Jiaxing. Whereas previously the trip from Ningbo to Shanghai and southern Jiangsu involved a detour of around 400 km (249 mi), the bridge reduces that distance to 80 km (50 mi), a reduction of 320 km (199 mi). The result is that Ningbo, with its port at Beilun, will be able to compete with Shanghai's port Pudong for international sea freight.
Hangzhou Bay Bridge
Carries 6 lanes of expressway
Crosses Hangzhou Bay
Locale Jiaxing / Cixi City
Longest span 448 m (1,470 ft)
Total length 35.673 km (22 mi)
Beginning date of construction June 8, 2003
Completion date June 26, 2007
Opening date May 1, 2008
Toll yes
Jiangyin Suspension Bridge China

The Jiangyin Suspension Bridge is the most seaward bridge to cross the Yangtze River of China. It connects the cities of Jiangyin and Jingjiang. The main span of the bridge is 1,385 metres (4,544 ft) meters long, making it the sixth-longest span suspension bridge in the world and the largest in China at the time of its completion in 1999. With the completion of the Runyang Bridge in 2005 and the Xihoumen Bridge in 2007 it became the third largest in China.
Located in the center of the Jiangsu Province, it carries the traffic from two national expressways; Tongjiang-Sanya Expressway on the east coast and the Beijing-Shanghai Expressway on the west. There are three traffic lanes in both directions and pedestrian sidewalks. The location of the bridge was selected because it is a spot where the river is narrow. The height clearance for river navigation is 50 metres (164 ft).
The bridge was planned so that it would be completed in time to mark the 50th anniversary of the Chinese Revolution of 1947. It was the first long-span bridge of its kind to be designed in China. Foundation work began in 1994. Engineering, manufacture and construction of the bridge was completed in just less than three years. The concrete towers are 190 metres (623 ft) tall, roughly equivalent in height to a 60 story building. The main span is made of flat streamlined steel box girders. The steel deck was erected by raising pre-assembled units weighing up to 500 metric tons with jacks. (pictures) The side spans are made by pre-stressed continuous concrete girders. The bridge opened on September 28, 1999.
In 2002 the bridge received an award at the International Bridge Conference for "...outstanding achievement in bridge engineering that, through vision and innovation, provides an icon to the community for which it was designed
Tsing Ma Bridge Hong Kong - China


Tsing Ma bridge viewed from the Tsing Yi Island visitors centre.

Tsing Ma Bridge viewed from Tung Wan Beach, Ma Wan
Tsing Ma Bridge is a bridge in Hong Kong, China. It is the world's seventh-longest span suspension bridge. The bridge was named after two of the islands in Hong Kong, namely Tsing Yi and Ma Wan . It has two decks and carries both road and rail traffic, which also makes it the largest suspension bridge of this type. The bridge has a main span of 1,377 metres (4,518 ft) and a height of 206 metres (676 ft). The span is the largest of all bridges in the world carrying rail traffic.
The 41 metres (135 ft) wide bridge deck carries six lanes of automobile traffic, with three lanes in each direction. The lower level contains two rail tracks. There are also two sheltered carriageways on the lower deck for maintenance access and as backup for traffic when particularly severe typhoons strike Hong Kong. Though road traffic would need to be closed in that case, trains could still get through in either direction.
[edit] Major components
Bridge tower foundations - one tower located on Wok Tai Wan of Tsing Yi side and the other on a man-made island 120 m from the coast of Ma Wan Island. Both towers are 206m above sea level and founded on relatively shallow bedrock. The towers are two-legged with trusses at intervals, in the form of portal beam design. The legs were constructed with high-strength concrete of 50 MPa (concrete grade 50/20) strength, using a slipform system in a continuous operation.
Anchorages - the pulling forces in the main suspension cables is taken up by large gravity anchorages located at both ends of the bridge. They are massive concrete structures deeply seated on bedrock on the landside of Tsing Yi and Ma Wan island. The total weight of concrete used in the Tsing Yi anchorage is 200,000 tonnes and Ma Wan Anchorage is 250,000 tonnes.
Main cables - The cables were constructed by an aerial spinning process. The process involved drawing wires from a constant-tension supply, and pulling loops of these wires from one anchorage to the other, passing a 500-tonne cast-iron saddle on top of each bridge tower seating the cable. A total of 70,000 nos. galvanised wires of 5.38 mm diameter were placed and adjusted to form the 2 nos. of 1.1 m diameter main cables.
Suspended deck - The steelwork for the deck structure was fabricated in Britain and Japan. After delivery, they were further processed and assembled in Dongguan of China into standard deck modules. A total of 96 modules, each 18 m long and about 480 tonnes in weight, were prepared. These deck modules were brought to the site by specially designed barges and raised into the deck position by a pair of strand jack gantries that could manoeuvre along the main cable.
Approach span on Tsing Yi side - similar in form and cross-section to the suspended deck, but the approach span was supported on piers instead of cable-support. The first span was assembled on the ground and raised into position using strand jacks. Further erection then proceeded in cantilever in smaller sections, using derrick cranes stationed on the deck level. An expansion joint which allowed for a maximum thermal movement of ± 835 mm was also provided and located inside the approach span section.
Carries 6 lanes of roadway (upper)
2 MTR rail lines, 2 lanes of roadway (lower)
Crosses Ma Wan Channel
Locale Ma Wan Island and Tsing Yi Island
Design Double-decked suspension bridge
Longest span 1,377 metres (4,518 ft)
Width 41 metres (135 ft)
Opening date April 27, 1997
Toll HK$30 (cars)
Coordinates 22°21′05″N, 114°04′27″E
The Akashi-Kaikyō Bridge Japan


View from water level

At night.

Viewed from an airplane.
Jembatan Akashi-Kaikyō (明石海峡大橋; Akashi Kaikyō Ō-hashi) adalah jembatan gantung (suspension bridge) di atas selat Akashi yang menghubungkan Maiko di kota Kobe dengan kota Awaji di pulau Awaji, Jepang. Jembatan tol Akashi-Kaikyo terlihat indah di waktu malam dengan gemerlap lampu-lampu beraneka warna, sehingga jembatan ini juga dikenal dengan nama Pearl Bridge (jembatan mutiara).
Sebelum Jembatan Akashi-Kaikyō dibangun, kapal feri merupakan satu-satunya sarana transportasi yang dipakai untuk menyeberangi derasnya selat Akashi. Di tahun 1955, terjadi tabrakan akibat cuaca buruk di Laut Pedalaman Seto antara 2 kapal feri dengan korban 168 tewas yang sebagian besar anak-anak sekolah yang sedang studi wisata. Kemarahan masyarakat mendorong pemerintah Jepang untuk mulai merancang jembatan-jembatan yang menghubungkan pulau-pulau di Laut Pedalaman Seto, termasuk di antaranya jembatan gantung di atas selat Akashi. Pada mulanya, Jembatan Akashi-Kaikyō dirancang untuk dilewati kendaraan bermotor dan kereta api, tapi pada saat proyek pembangunan diumumkan pada bulan April 1986 ternyata jembatan hanya untuk dilewati kendaraan bermotor saja (semuanya ada 6 jalur). Pembangunan fisik dimulai tahun 1988 dan jembatan dibuka untuk umum pada tanggal 5 April 1998.
Konstruksi
Jembatan terdiri dari 3 rentangan dengan panjang keseluruhan 3.911 meter. Panjang rentangan utama yang ada di tengah-tengah 1991 meter, sedangkan panjang 2 rentangan yang menuju ke darat, masing-masing 960 meter. Panjang rentangan utama melar 1 meter akibat Gempa bumi besar Hanshin 17 Januari 1995, padahal sewaktu dibangun panjangnya cuma 1990 meter. Menara jembatan tempat kabel-kabel diikat, tingginya 300 meter di atas permukaan laut.
Jembatan dirancang agar bisa bertahan dari gempa bumi hingga 8,5 skala Richter, derasnya arus laut di Selat Akashi, serta tiupan angin kencang hingga kecepatan angin maksimum 286 km/jam.
Total biaya pembangunan diperkirakan 5 miliar dolar AS yang diharapkan bisa balik modal dengan memberlakukan tarif tol yang mahal.
Tujuan wisata
Jembatan Akashi-Kaikyō mempunyai 2 buah taman untuk tujuan wisata yang letaknya berseberangan, satu di sisi Maiko dan satu lagi di sisi pulau Awaji.
Museum mengenai jembatan Akashi-Kaikyō terdapat di taman yang terletak di sisi Maiko. Wisatawan dapat naik ke atas jembatan untuk menyaksikan pemandangan laut selat Akashi. Taman Maiko (bahasa Jepang:舞子公園, Maiko kō-en)dapat dicapai dengan kereta JR dan kereta Sanyo Dentetsu.
Iluminasi
Serangkaian lampu dari tabung sinar katoda berwarna dasar merah, hijau, biru menghiasi kabel-kabel utama yang menahan jembatan Akashi-Kaikyō. Desainer iluminasi bernama Ishii Motoko merancang warna-warni lampu pada kabel utama jembatan agar berubah-ubah sesuai jam, hari, dan musim. Warna lampu-lampu di hari biasa: hijau di musim semi, biru di musim panas, merah di musim gugur, dan kuning di musim dingin. Warna-warni pelangi ditampilkan satu jam sekali sebagai penunjuk waktu, sedangkan setiap setengah jam sekali ditampilkan warna-warni batu mulia. Gemerlapnya lampu-lampu jembatan dapat dinikmati sampai jam 12 tengah malam. Sekali setahun untuk memperingati Gempa Bumi Hanshin, setiap tanggal 17 Januari jembatan Akashi-Kaikyō hanya menampilkan lampu-lampu berwarna putih tanda berduka.
Carries 6 lanes of roadway
Crosses Akashi Strait
Locale Awaji Island and Kobe
Maintained by Honshū-Shikoku Bridge Authority
Design Suspension bridge
Longest span 1,991 metres (6,532 ft)
Total length 3,911 metres (12,831 ft)
Clearance below 65.72 meters
Opening date April 5, 1998
Toll 2,300 Yen or US$20
Coordinates 34°36′59″N 135°01′13″E / 34.61639, 135.02028Coordinates: 34°36′59″N 135°01′13″E / 34.61639, 135.02028
Great Belt Bridge Denmark


Viewed from airplane

viewed from top
The Great Belt Fixed Link (Danish: Storebćltsforbindelsen) is the fixed link between the Danish islands of Zealand and Funen across the Great Belt. It consists of a road suspension bridge and railway tunnel between Zealand and the island Sprogř, as well as a box girder bridge between Sprogř and Funen. The "Great Belt Bridge" (Danish: Storebćltsbroen) commonly refers to the suspension bridge, although it may also be used to mean the beam bridge or the link in its entirety. The suspension bridge, known as the East Bridge, has the world's third longest main span (1.6 km).
The link replaces the ferries which had been the primary means of crossing Great Belt for more than 100 years. After decades of speculation and debate, the decision to construct the link was made in 1986; while it was originally intended to complete the railway link three years before opening the road connection, the link was opened to rail traffic in 1997 and road traffic in 1998. At an estimated cost of DKK 21.4 billion (1998 prices), the link is the largest construction project in Danish history.
The everyday operation and maintenance of the link is done by the company A/S Storebćlt under Sund & Bćlt. In order to pay back the construction expenses, the road connection is a toll road, and train operators pay a fixed toll per train in order to cross. The link has reduced travel times significantly; previously taking about an hour by ferry, Great Belt can now be crossed in about 10 minutes.
Construction
The construction of the fixed link across the Great Belt became the biggest building project ever in the history of Denmark. In order to connect Halsskov on Zealand with Knudshoved on Funen, 18 kilometres to its west, a two-track railway and a four-lane motorway had to be built, aligned via the small island Sprogř in the middle of the Great Belt. In general terms, the project comprised three different construction tasks: The East Bridge for road transport, the East Tunnel for rail transport and the West Bridge for road and rail transport combined.
Official name Řstbroen
Carries Motor vehicles
Crosses Great Belt
Maintained by A/S Storebćlt
Design Suspension bridge
Piers in water 19
Longest span 1,624 metres (5,328 ft)
Total length 6,790 metres (22,277 ft)
Width 31 metres (102 ft)
Height 254 metres (833 ft)
Clearance below 65 metres (213 ft)
Opening date June 14, 1998
Coordinates 55°20′31″N 11°02′10″E / 55.34194, 11.03611
Verrazano-Narrows Bridge USA


Panoramic view of the Verrazano-Narrows Bridge, from Staten Island looking toward Brooklyn.

Verrazano Bridge viewed from the deck of the Norwegian Dawn cruise ship.
The Verrazano-Narrows Bridge is a double-decked suspension bridge that connects the boroughs of Staten Island and Brooklyn in New York City at the Narrows, the reach connecting the relatively protected upper bay with the larger lower bay.
The bridge is named for Italian explorer Giovanni da Verrazzano, the first known European navigator to enter New York Harbor and the Hudson River, while crossing The Narrows. It has a center span of 4,260 feet (1,298 m) and was the largest suspension bridge in the world from the time of its completion in 1964 until 1981. It now has the eighth longest center span in the world, and is the largest suspension bridge in the United States. Its massive towers can be seen throughout a good part of the New York metropolitan area, including from spots in all five boroughs of New York City.
The bridge furnishes a critical link in the local and regional highway system. It is the starting point of the New York City Marathon. The bridge marks the gateway to New York Harbor; all cruise ships and most container ships arriving at the Port of New York and New Jersey must pass underneath the bridge. Most ships must be built to accommodate the clearance under the bridge.[citation needed]
Among local residents, it is often referred to as simply the Verrazano Bridge or Verrazano-Narrows.
September 11, 2001
On the morning of September 11, 2001, United Airlines Flight 175 was hijacked and flown directly over the Verrazano-Narrows Bridge en route to the World Trade Center. Metropolitan Transportation Authority officials had earlier expressed concern about the plane's proximity to the bridge and later closed the bridge's upper deck after the plane struck the South Tower. When details of the attack on The Pentagon emerged, the MTA shut down the Verrazano-Narrows bridge, along with most other traffic throughout the city. After the collapse of the North Tower, the MTA opened both an eastbound and westbound lane of the bridge to allow traffic to flow briefly before closing it again at 1:00 p.m. that day. It remained closed until the following morning at 9:00 a.m
Bridge usage
The one-way toll (paid westbound into Staten Island only) in cash is $10 per car or $4.50 per motorcycle. E-ZPass users get a discount of $1.70 per car.
As of March 2007, there is a reduced toll of $4.80 for Staten Island residents. There is also a significant carpool discount. From 1964 to 1986, the toll was collected in both directions, until Staten Island residents concerned about pollution from idling vehicles called for one way tolls. However, as of 2007 the eastbound toll booths are still in place, requiring drivers to slow down. While the high cost of the toll between Brooklyn and Staten Island has always been an issue for residents, some[who?] favor the toll because they see it as a way to curb population growth on Staten Island.
Recently, residents living on both ends of the bridge have lobbied for pedestrian access. In October 2003, Mayor Michael Bloomberg promised to look into establishing the long-awaited pedestrian and bicycle access.
Official name Verrazano-Narrows Bridge
Carries 12 lanes (6 lanes upper and 6 lanes lower) of I-278
Crosses The Narrows
Locale New York City (Staten Island – Brooklyn)
Maintained by Triborough Bridge & Tunnel Authority TBTA
Design Double-decked Suspension bridge
Longest span 4,260 feet (1,298 m)
Vertical clearance 15 feet (4.6 m) (upper level)
14.4 feet (4.4 m) (lower level)
Clearance below 228 feet (69.5 m) at mean high water[1]
AADT 194,000[2]
Opening date November 21, 1964 (upper level)
June 28, 1969 (lower level)
Toll $10.00 as of March 16, 2008 (westbound only per car in cash); discount available with E-ZPass.
Golden Gate Bridge San Francisco USA


Air show over Golden Gate Bridge.

Viewing from edge of Baker Beach.

The Golden Gate Bridge by night, with part of downtown San Francisco visible in the background at far left.
The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the opening of the San Francisco Bay onto the Pacific Ocean. As part of both US Highway 101 and California Route 1, it connects the city of San Francisco on the northern tip of the San Francisco Peninsula to Marin County.
The Golden Gate Bridge had the longest suspension bridge span in the world when it was completed in 1937 and has become an internationally recognized symbol of San Francisco and California. Since its completion, the span length has been surpassed by eight other bridges. It still has the second longest suspension bridge main span in the United States, after the Verrazano-Narrows Bridge in New York City. In 2007, it was ranked fifth on the List of America's Favorite Architecture by the American Institute of Architects.
[edit] Setting
The Golden Gate Bridge spans the Golden Gate, a narrow, 400-foot (120 m) deep strait that serves as the mouth of the San Francisco Bay, between San Francisco at the northernmost tip of the San Francisco Peninsula, and the Marin Headlands at the far southern end of Marin County. Although close by proximity, the two sides of the strait are separated by significant natural obstacles. Crossing the strait directly by boat is dangerous because of strong currents and lack of suitable landings. Ocean tides drive an average of 528 billion gallons (2 billion cubic meters) of water every six hours, at peak currents exceeding 5.6 miles per hour (2.5 m/s). Circumnavigating the Bay, however, involves a trip of several hundred miles and crossing several major rivers
Carries 6 lanes of U.S. Route 101/State Route 1, pedestrians and bicycles
Crosses Golden Gate
Locale San Francisco, California and Marin County, California
Maintained by Golden Gate Bridge, Highway and Transportation District[1]
Design Suspension, truss arch & truss causeways
Longest span 4,200 feet (1,280 m)[2]
Total length 8,981 feet (2,737 m)
Width 90 feet (27 m)
Height 746 feet (227 m)
Vertical clearance 14 feet (4.3 m) at toll gates, higher truck loads possible
Clearance below 220 feet (67 m) at mean higher high water
AADT 100,000[2]
Opening date 27 May 1937
Toll US$5.00 (southbound) (US$4.00 with FasTrak) .

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