220t mining machine in Japan

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2.

Stiffening beam, also known as rigid beam, mainly plays the role of supporting and transferring load. It is the main component to bear wind load and other horizontal forces

stiffening beam is only suitable for suspension bridges with span less than 500m, and most of them are box girder

By adopting more reasonable lifting scheme, the offset of side tower saddle can be graally reced, and the pushing direction of saddle is unchanged

when the main span is lifted from the cable tower to the middle of the span, the horizontal tangent angle of the main cable on the side of the main span of the side tower first increases and then decreases, and the inclination angle is greater than that of the completed bridge and empty cable state, so it is necessary to reserve a gap at the top edge of the concrete side tower to avoid the contact between the main cable and the side tower

extended data:

precautions for the construction of main span stiffening beam:

e to the large span of main span, the temperature drop or traction force required by temperature difference or pre deviation closure alone is large, so the construction is difficult. Therefore, the method of combining temperature difference and pre deviation closure should be adopted

However, if the temperature ring closure is higher than the design temperature, the required traction is much greater than that of the hoisting scheme starting from the cable tower

Therefore, it is necessary to select the closure scheme and determine the traction value according to the ambient temperature

3. As a kind of cable system, cable-stayed bridge is the most important type of long-span bridge because of its larger span capacity than beam bridge
the cable-stayed bridge is composed of pylon, girder and stay cable. The cable tower types are A-type, inverted Y-type, H-type, single column, and the materials are steel and concrete. There are single cable plane, parallel double cable plane, cable plane and so on. For example, Wuhan Second Yangtze River Bridge and Baishazhou Yangtze River Bridge are reinforced concrete cable-stayed bridges with double pylons and double cable planes. Modern cable-stayed bridge can be traced back to the stransonde bridge built in Sweden in 1956, with a main span of 182.6 meters. After half a century, the technology of cable-stayed bridge has been developed unprecedentedly. There are more than 200 cable-stayed bridges with main span more than 200 meters in the world, including more than 40 ones with span more than 400 meters. In particular, after the 1990s, the world's famous cable-stayed bridges include the Normandy cable-stayed bridge in France (with a main span of 856m), the Nancha steel box girder cable-stayed bridge of the second Nanjing Yangtze River Bridge (with a main span of 628m), and the Duoo bridge (with a main span of 890m), the world's largest span, which was built in Japan in 1999

so far, more than 100 cable-stayed bridges of various types have been built in China, of which 52 have spans greater than 200 meters. At the end of 1980s, based on the experience of Anasis bridge in Canada, China built Shanghai Nanpu Bridge in 1991 (a composite girder cable-stayed bridge with a main span of 423 meters), which created a precedent for China to build a large-span cable-stayed bridge with a span of more than 400 meters. China has become the country with the largest number of cable-stayed bridges. In the top 10 famous cable-stayed bridges in the world, there are six in China, and there are only six cable-stayed bridges with a span of more than 600 meters in the world, and China accounts for four

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