During the Qin and Han Dynasties, Liang Shi Bridge was widely built in China. At present, the longest and most arduous Liang Shi Bridge in the world, namely Wan 'an Bridge, also known as Luoyang Bridge, was built in 1053- 1059 Quanzhou, Fujian. The bridge is 800 meters long and has 47 holes. It is located on the Haikou River, which is "rough and deep". This bridge is paved with rocks at the bottom of the bridge site, which is the beginning of modern mat foundation. The bridge foundation is glued into a whole by cultivating marine oysters, which is also a unique bridge-building method in the world. It is a brave breakthrough in the history of Chinese bridges to build such a long bridge under such difficult and complicated hydrological conditions nearly a thousand years ago.

The Hudu Bridge in Tanzhou, Fujian Province, built at 1240, is also the most amazing beam bridge. The total length of this bridge is about 335m, and the length of some Liang Shi is 23.7m m. It is composed of three Liang Shi along the width direction, each Liang Shi is 1.7 m wide and 1.9 m high, weighing more than 200 tons. This bridge has been preserved to this day.

The outstanding representative of ancient stone arch bridge in China is the world-famous Zhao Zhouqiao (also known as Anji Bridge) in Zhao County, Hebei Province. This bridge was built by Li Chun in the early years of the great cause of Sui Dynasty (around 605 AD). The hollow circular stone arch bridge has a clear span of 37m, a width of 9m and a height of 7.23m There are two abdominal arches with different spans on both sides of the arch ring, which can not only reduce the dead weight of the bridge, save materials, but also facilitate the layout. Zhao Zhouqiao's design concept and exquisite craftsmanship are not only second to none among ancient bridges in China. According to the research of bridges in the world, open-shouldered arch bridges like this didn't appear in Europe until the middle of the 9th century, which was more than 200 years later than China. Zhao Zhouqiao's carving art, including railings, watchposts and lock stones, lions, dragons and animals are lifelike in shape and exquisite in craftsmanship, which is worthy of being regarded as an artistic treasure in the treasure house of cultural relics, and it is in the construction of stone arch bridge in China.

Xiangzi Bridge (also known as Guangji Bridge) across the Han River in Chaoan County, Guangdong Province, was built in 1 169, with a total length of 5 17.95m and a total of ***20 piers and 19 holes. Superstructures include stone arches, wooden beams, Liang Shi and other types, with 65,438. On the one hand, it is suitable for the passage of large merchant ships and upstream rafts, and it also avoids too many piers blocking the river course, aggravating the erosion of the bridge foundation and causing water damage. This world's earliest open-close bridge is rare in the history of ancient bridge construction because of its long column stone bridges, large stone piers, numerous bridges and difficult construction conditions. . 8. 1957, the first Yangtze River Bridge, Wuhan Yangtze River Bridge, was successfully completed, ending the situation that China Wanli Yangtze River has no bridges. From then on, "a bridge flies north and south, and the natural barrier becomes a thoroughfare." The main bridge of this bridge is a triple 3X 128m continuous steel truss beam, and the width of the upper highway deck of the double-track railway is 18m, which is 2.

1969, the world-famous Nanjing Yangtze River Bridge was successfully completed. This is a modern large-scale bridge designed, manufactured and constructed by our country and built with domestic high-strength steel. Except that the first hole on the north bank of the bridge is a simply supported steel truss of 128m, all the others are 9 holes and 3 joints, each joint is a 3x l60m continuous steel truss. The upper floor is a highway bridge, and the lower floor is a double-track railway. Including the approach bridge, the total length of the railway section is 6772m, and the highway section is 4589 m. The water depth of the bridge is turbulent, the riverbed and water quality are extremely complicated, and the construction of pier foundation is very difficult. The completion of Nanjing Yangtze River Bridge marks that China's bridge construction has reached the advanced level in the world, and it is also an important milestone in the history of Chinese bridges.

At present, the largest stone arch bridge in the world is 155m, which was built in Sweden in 1946.

The first cable-stayed bridge with reinforced concrete main girder in the world is a waterway bridge built in Spain in 1925, with a main span of 60.35m m.

Lunabarios Bridge in Spain, with a span of 440 meters, is the largest prestressed concrete cable-stayed bridge with double-sided radial dense cables in the world.

The Tsing Ma Bridge in Hong Kong spans the Tsing Ma Bay Strait and connects the new airport in Hong Kong, with a cost of 965.438+0.5 million US dollars. The span of the bridge is1377m. Ranked fifth in the world, it is a "sister bridge" with Jiangyin Yangtze River Bridge.

Japan's Akashi Strait Bridge spans the internal sea of Japan, connecting Kobe and Awaji Island in Japan. The total length of this bridge is 3 190M, and the middle span is 1990m, which will be completed in 1998. It can withstand an earthquake measuring 8.5 on the Richter scale and is the first suspension bridge in the world.

Jiangyin Yangtze River Highway Bridge, the first bridge in China, is a river-crossing project of the coastal skeleton in the "two vertical and two horizontal" national trunk line of the Eighth Five-Year Plan of China. It is the first steel suspension bridge in China and the fourth longest suspension bridge in the world. The bridge is composed of tower, main cable, anchor, steel box girder and other main components. The total length of the bridge is 307 1 m and the main span is 1385 m. The bridge deck is 33.8 meters wide, with six lanes in both directions, and the design speed is100 km/h; The navigation clearance is 50 meters, and it can pass 50,000 tons of Panamanian bulk carriers. The two main cables of Jiangyin Yangtze River Highway Bridge are more than 2,400 meters long, with a diameter of nearly 1 meter, and each cable weighs more than 1.4 million tons. The main cable is made of 127 steel wire with a diameter of 5.3 mm, and then composed of 169 steel wire. There are 85 suspenders on both sides of the main bridge, of which 2 suspenders are used to connect the main cable and the bridge deck. The elevation of pylon on both banks is196.236m, which is equivalent to the height of 65 stories. The foundation of the North Tower is 43.5 meters long and 73.5 meters wide, with 123 piles nearly 90 meters long. The concrete plane of the North Anchor is 69 meters long and 5 1 meter wide (the area is equivalent to a football field). It sank 58 meters underground and is known as the largest open caisson in the world. Jiangyin Yangtze River Bridge was officially started on 1 October 22nd 1994, 165438,1October 22nd 1999,1,ranking "the first in China and the fourth in the world".