问答题 It took nine years from the time the Danish and Swedish governments agreed to build a fixed link between their countries to the time the first car, train, truck and bicyclists crossed the Oresund Bridge.
Construction of the bridge, including design and cornerstone, began in March 1991 and was completed in July 2000. Today, it is the longest stone-stayed road and rail bridge in the world. At approximately 10 miles (16 kilometers), including the tunnel, it is an engineering and architectural marvel. But as time has proven, the bridge is a cultural and economic boon as well. The sleek span of concrete whose design typifies Scandinavian minimalism has contributed greatly to the development of the Oresund region: the eastern part of Denmark, including Copenhagen, and the southwestern part of Sweden, including Maim? and Lund.
The level of commuting between Maim? and Copenhagen has quadrupled since the opening of the bridge in 2000, and the number of Danes moving to the south of Sweden has increased sixfold. The Oresund region has become a cultural and economic powerhouse, considered a model region by the European Union.
Work on the bridge began in 1995, and was undertaken by a team of international consulting and construction companies.
From the beginning, construction of the bridge complied with some of the world's toughest environmental regulations, as well as many advanced design and construction details. The Mexico-based CEMEX, one of the world's largest producers of Cement and ready-mix concrete, was awarded a contract to deliver tons of high-quality cement to help build the main part of the bridge, the two approach bridges and the tunnel.
When it opened in July 2000, the Oresund Bridge consisted of a 3.5-kilometer immersed tunnel, the largest of its kind in the world, a 4-kilometer long artificial island (made from mud dug out from the bottom of strait to make space for the tunnel) and a 7.8-kilometer cable-stayed bridge, the world's longest bridge including both a highway and a railroad.
Though just half of the total construction, the actual bridge span, is visible above water, the overall architecture was designed to please the eye from both the Danish and Swedish sides of the strait.
The four 204-meter (670 feet) tall pillars carrying the bridge have a simple Scandinavian design. To drivers and passengers crossing the bridge, the pillars provide a visual, as well as actual, impression of stability and calm.
The two-level structure is made of steel and concrete. Along the two approach bridges, tracks are placed in concrete troughs that turn into steel decks on the bridge. The bridge's upper deck carries cars and trucks, while the lower deck accommodates the railroad. The four pillars are grounded in giant cement boxes placed at the bottom of the strait, about 18 meters below sea level.
Last year, an average of 13,600 vehicles and 17,000 passengers crossed the bridge every day, and traffic continues to increase by 10-20 percent every year.
Throughout the construction process, the Danish and Swedish environmental agencies have surveyed but found no changes in the wildlife, birds, fish and vegetation surrounding the bridge. In addition, the chemicals used in construction and the percentage of waste materials have been kept to a minimum, as required by both Danish and Swedish laws.
In 2003, the Oresund Bridge won the IABSE (International Association for Bridge and Structural Engineering) Outstanding Structural Award for its innovative design, planning and construction management, as well as its strict compliance with the time schedule, budget and environmental requirements.