I. China

There has always been a saying in the world bridge industry: Look at Europe and America before the 1970s, Japan in the 1990s, and China in 2 1 century! 2 1 century, China is the second bridge in China, and no other country is the first. It can be said that the number and quality of bridges in China are the first in the world, and the level of research and construction is absolutely first-class in the world!

China has made many great achievements in infrastructure construction since modern times, so it has also been awarded the title of "Infrastructure Madman". Since modern times, the construction of large bridges in China has developed rapidly. Many bridges in China are challenges to nature, breaking through many natural hazards, accomplishing many things that human beings cannot accomplish, and many famous bridges have also broken many world records.

Second, the United States

The United States is recognized as the country with the most extensive transportation network in the world. Especially the 74,674-kilometer national highway system. The average service life of 600,000 bridges registered by national statistics is 45 years, and the United States is also an important bridge building country in the world.

There are many world-class bridge projects. For example, Brooklyn Bridge is the longest and most famous bridge in new york, connecting Manhattan and Brooklyn.

Third, Japan.

Japan has been a world-class bridge power for many years. Later, China built a bridge to surpass it. It is worth mentioning that Japan is an archipelagic country, and the strait and the inland sea hinder the traffic between the archipelagos. Due to the special geographical environment, bridge engineering has been greatly developed in Japan. As early as April 2008, the total length of Japanese highway bridges was about 9,500 kilometers.

Steel bridges account for about 38% of the total number of highway bridges. 3%。 It is worth mentioning that steel structure is very popular in Japan because of its good seismic performance, mature construction and manufacturing technology, cost competitiveness and leapfrog ability.

The history of steel bridge construction in Japan can be traced back to 1868. During Meiji period (1868- 19 12), the first black iron bridge and the first truss bridge were built. The first steel suspension bridge (length 1 16m, width 3. 1m) was completed in 19 15. This bridge was designated as an important cultural heritage of Japan in 2003.

Fourth, Britain.

Britain is the bridgehead in the world with a long history. For example, Tieqiao Gorge is a symbol of the industrial revolution. /kloc-in the 0/8th century, with the development of environment, people gradually realized the fields from mining to railway industry. The coal crusher blast furnace created by 1708 is a precursor to the development of coke industry.

The bridge connecting Tieqiao Gorge is the first bridge made of metal in the world, which greatly promotes the development of science and technology and architecture. /kloc-After the 0/8th century, Europe took the lead in entering the industrial society, which fundamentally changed the 200-year history of western civilization and promoted the construction of large-scale railway bridges.

Verb (abbreviation for verb) Italy

Italy has a long history of building bridges. Italy has many world-famous bridges. As early as the European Renaissance, in order to make the longitudinal slope of the bridge deck smooth and easy to pass, the rise-span ratio of urban arch bridges was obviously reduced, the arch curve was changed accordingly, and the stone processing was more refined.